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Kuhn C, Mohebbi N, Ritter A. Metabolic acidosis in chronic kidney disease: mere consequence or also culprit? Pflugers Arch 2024; 476:579-592. [PMID: 38279993 PMCID: PMC11006741 DOI: 10.1007/s00424-024-02912-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/29/2024]
Abstract
Metabolic acidosis is a frequent complication in non-transplant chronic kidney disease (CKD) and after kidney transplantation. It occurs when net endogenous acid production exceeds net acid excretion. While nephron loss with reduced ammoniagenesis is the main cause of acid retention in non-transplant CKD patients, additional pathophysiological mechanisms are likely inflicted in kidney transplant recipients. Functional tubular damage by calcineurin inhibitors seems to play a key role causing renal tubular acidosis. Notably, experimental and clinical studies over the past decades have provided evidence that metabolic acidosis may not only be a consequence of CKD but also a driver of disease. In metabolic acidosis, activation of hormonal systems and the complement system resulting in fibrosis have been described. Further studies of changes in renal metabolism will likely contribute to a deeper understanding of the pathophysiology of metabolic acidosis in CKD. While alkali supplementation in case of reduced serum bicarbonate < 22 mmol/l has been endorsed by CKD guidelines for many years to slow renal functional decline, among other considerations, beneficial effects and thresholds for treatment have lately been under intense debate. This review article discusses this topic in light of the most recent results of trials assessing the efficacy of dietary and pharmacological interventions in CKD and kidney transplant patients.
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Affiliation(s)
- Christian Kuhn
- Clinic for Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
| | | | - Alexander Ritter
- Clinic for Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen, Switzerland.
- Clinic for Nephrology, University Hospital Zurich, Zurich, Switzerland.
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Rodríguez D, Gurevich E, Mohammadi Jouabadi S, Pastor Arroyo EM, Ritter A, Estoppey Younes S, Wagner CA, Imenez Silva PH, Seeger H, Mohebbi N. Serum sclerostin is associated with recurrent kidney stone formation independent of hypercalciuria. Clin Kidney J 2024; 17:sfad256. [PMID: 38186870 PMCID: PMC10768761 DOI: 10.1093/ckj/sfad256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Indexed: 01/09/2024] Open
Abstract
Background Kidney stones are frequent in industrialized countries with a lifetime risk of 10 to 15%. A high percentage of individuals experience recurrence. Calcium-containing stones account for more than 80% of kidney stones. Diet, environmental factors, behavior, and genetic variants contribute to the development of kidney stones. Osteocytes excrete the 21 kDa glycoprotein sclerostin, which inhibits bone formation by osteoblasts. Animal data suggests that sclerostin might directly or indirectly regulate calcium excretion via the kidney. As hypercalciuria is one of the most relevant risk factors for kidney stones, sclerostin might possess pathogenic relevance in nephrolithiasis. Methods We performed a prospective cross-sectional observational controlled study in 150 recurrent kidney stone formers (rKSF) to analyse the association of sclerostin with known stone risk factors and important modulators of calcium-phosphate metabolism. Serum sclerostin levels were determined at the first visit. As controls, we used 388 non-stone formers from a large Swiss epidemiological cohort. Results Sclerostin was mildly increased in rKSF in comparison to controls. This finding was more pronounced in women compared to men. Logistic regression indicated an association of serum sclerostin with rKSF status. In hypercalciuric individuals, sclerostin levels were not different from normocalciuric patients. In Spearman correlation analysis we found a positive correlation between sclerostin, age, and BMI and a negative correlation with eGFR. There was a weak correlation with iPTH and intact FGF 23. In contrast, serum sclerostin levels were not associated with 25-OH Vitamin D3, 1,25-dihydroxy-Vitamin D3, urinary calcium and phosphate or other urinary lithogenic risk factors. Conclusion This is the first prospective controlled study investigating serum sclerostin in rKSF. Sclerostin levels were increased in rKSF independent of hypercalciuria and significantly associated with the status as rKSF. It appears that mechanisms other than hypercalciuria may be involved and thus further studies are required to elucidate underlying pathways.
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Affiliation(s)
- Daniel Rodríguez
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | | | - Soroush Mohammadi Jouabadi
- Department of Internal Medicine , Division of Vascular Medicine and Pharmacology, Erasmus Medical Center, University Medical Center Rotterdam, the Netherlands
| | | | - Alexander Ritter
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | | | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Pedro Henrique Imenez Silva
- Department of Internal Medicine, Division of Nephrology and Transplantation, Erasmus Medical Center, University Medical Center Rotterdam, the Netherlands
| | - Harald Seeger
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
- Institute of Physiology, University of Zurich, Zurich, Switzerland
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Mohebbi N, Ritter A. Bicarbonate ineffectiveness for kidney transplant - Authors' reply. Lancet 2023; 402:1528. [PMID: 37898532 DOI: 10.1016/s0140-6736(23)01624-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 08/02/2023] [Indexed: 10/30/2023]
Affiliation(s)
- Nilufar Mohebbi
- Division of Nephrology, University Hospital, Zurich 8091, Switzerland.
| | - Alexander Ritter
- Division of Nephrology, University Hospital, Zurich 8091, Switzerland
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Metry EL, Garrelfs SF, Deesker LJ, Acquaviva C, D’Ambrosio V, Bacchetta J, Beck BB, Cochat P, Collard L, Hogan J, Ferraro PM, Franssen CF, Harambat J, Hulton SA, Lipkin GW, Mandrile G, Martin-Higueras C, Mohebbi N, Moochhala SH, Neuhaus TJ, Prikhodina L, Salido E, Topaloglu R, Oosterveld MJ, Groothoff JW, Peters-Sengers H. Determinants of Kidney Failure in Primary Hyperoxaluria Type 1: Findings of the European Hyperoxaluria Consortium. Kidney Int Rep 2023; 8:2029-2042. [PMID: 37849991 PMCID: PMC10577369 DOI: 10.1016/j.ekir.2023.07.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/10/2023] [Accepted: 07/24/2023] [Indexed: 10/19/2023] Open
Abstract
Introduction Primary hyperoxaluria type 1 (PH1) has a highly heterogeneous disease course. Apart from the c.508G>A (p.Gly170Arg) AGXT variant, which imparts a relatively favorable outcome, little is known about determinants of kidney failure. Identifying these is crucial for disease management, especially in this era of new therapies. Methods In this retrospective study of 932 patients with PH1 included in the OxalEurope registry, we analyzed genotype-phenotype correlations as well as the impact of nephrocalcinosis, urolithiasis, and urinary oxalate and glycolate excretion on the development of kidney failure, using survival and mixed model analyses. Results The risk of developing kidney failure was the highest for 175 vitamin-B6 unresponsive ("null") homozygotes and lowest for 155 patients with c.508G>A and c.454T>A (p.Phe152Ile) variants, with a median age of onset of kidney failure of 7.8 and 31.8 years, respectively. Fifty patients with c.731T>C (p.Ile244Thr) homozygote variants had better kidney survival than null homozygotes (P = 0.003). Poor outcomes were found in patients with other potentially vitamin B6-responsive variants. Nephrocalcinosis increased the risk of kidney failure significantly (hazard ratio [HR] 3.17 [2.03-4.94], P < 0.001). Urinary oxalate and glycolate measurements were available in 620 and 579 twenty-four-hour urine collections from 117 and 87 patients, respectively. Urinary oxalate excretion, unlike glycolate, was higher in patients who subsequently developed kidney failure (P = 0.034). However, the 41% intraindividual variation of urinary oxalate resulted in wide confidence intervals. Conclusion In conclusion, homozygosity for AGXT null variants and nephrocalcinosis were the strongest determinants for kidney failure in PH1.
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Affiliation(s)
- Elisabeth L. Metry
- Department of Pediatric Nephrology, Emma Children’s Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Sander F. Garrelfs
- Department of Pediatric Nephrology, Emma Children’s Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Lisa J. Deesker
- Department of Pediatric Nephrology, Emma Children’s Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Cecile Acquaviva
- Service de Biochimie et Biologie Moléculaire, UM Pathologies Héréditaires du Métabolisme et du Globule Rouge, Hospices Civils de Lyon, France
| | - Viola D’Ambrosio
- Department of Nephrology, Catholic University of the Sacred Heart, Rome, Italy
| | - Justine Bacchetta
- Centre de Référence des Maladies Rares Néphrogones, Hospices Civils de Lyon et Université Claude-Bernard Lyon 1, Lyon, France
| | - Bodo B. Beck
- Institute of Human Genetics, Center for Molecular Medicine Cologne, University Hospital of Cologne, Cologne, Germany
- Center for Rare and Hereditary Kidney Disease Cologne, University Hospital of Cologne, Cologne, Germany
| | - Pierre Cochat
- Centre de Référence des Maladies Rares Néphrogones, Hospices Civils de Lyon et Université Claude-Bernard Lyon 1, Lyon, France
| | - Laure Collard
- Department of Pediatric Nephrology, Center Hospitalier Universitaire Liège, Liège, Belgium
| | - Julien Hogan
- Department of Pediatric Nephrology, Assistance Publique–Hôpitaux de Paris Robert-Debré, University of Paris, Paris, France
| | | | - Casper F.M. Franssen
- Department of Internal Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jérôme Harambat
- Department of Pediatrics, Pediatric Nephrology Unit, Bordeaux University Hospital, Bordeaux, France
| | - Sally-Anne Hulton
- Department of Nephrology, Birmingham Women’s and Children’s Hospital NHS Foundation Trust, Birmingham, UK
| | - Graham W. Lipkin
- Department of Nephrology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Giorgia Mandrile
- Genetic Unit and Thalassemia Center, San Luigi University Hospital, Orbassano, Italy
| | - Cristina Martin-Higueras
- Institute of Biomedical Technology, CIBERER, University of Laguna, San Cristóbal de La Laguna, Spain
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | | | - Thomas J. Neuhaus
- Department of Pediatrics, Children’s Hospital Lucerne, Lucerne, Switzerland
| | - Larisa Prikhodina
- Department of Inherited and Acquired Kidney Diseases, Veltishev Research and Clinical Institute for Pediatrics and Pediatric Surgery of the Pirogov Russian National Research Medical University, Moscow, Russia
| | - Eduardo Salido
- Department of Pathology, Center for Biomedical Research on Rare Diseases, Hospital Universitario Canarias, Universidad La Laguna, Tenerife, Spain
| | - Rezan Topaloglu
- Division of Pediatric Nephrology, Department of Pediatrics, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Michiel J.S. Oosterveld
- Department of Pediatric Nephrology, Emma Children’s Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Jaap W. Groothoff
- Department of Pediatric Nephrology, Emma Children’s Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Hessel Peters-Sengers
- Center for Experimental and Molecular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
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Legay C, Haeusermann T, Pasquier J, Chatelan A, Fuster DG, Dhayat N, Seeger H, Ritter A, Mohebbi N, Ernandez T, Stoermann C, Buchkremer F, Segerer S, Wuerzner G, Ammor N, Roth B, Wagner CA, Bonny O, Bochud M. Differences in the food consumption between kidney stone formers and non-formers in the Swiss Kidney Stone Cohort. J Ren Nutr 2023:S1051-2276(23)00067-5. [PMID: 37120128 DOI: 10.1053/j.jrn.2023.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 04/09/2023] [Accepted: 04/16/2023] [Indexed: 05/01/2023] Open
Abstract
OBJECTIVE Diet has a major influence on the formation and management of kidney stones. However, kidney stone formers' diet is difficult to capture in a large population. Our objective was to describe the dietary intake of kidney stone formers in Switzerland and to compare it to non-stone formers. METHODS We used data from the Swiss Kidney Stone Cohort (n=261), a multicentric cohort of recurrent or incident kidney stone formers with additional risk factors, and a control group of CT-scan proven non-stone formers (n=197). Dieticians conducted two consecutive 24-h dietary recalls, using structured interviews and validated software (GloboDiet). We took the mean consumption per participant of the two 24-h dietary recalls to describe the dietary intake and used two-part models to compare the two groups. RESULTS The dietary intake was overall similar between stone and non-stone formers. However, we identified that kidney stone formers had a higher probability of consuming cakes and biscuits (odds ratio, OR[95% CI] =1.56[1.03; 2.37]) and soft drinks (OR=1.66[1.08; 2.55]). Kidney stone formers had a lower probability of consuming nuts and seeds (OR =0.53[0.35; 0.82]), fresh cheese (OR=0.54[0.30; 0.96]), teas (OR=0.50[0.3; 0.84]), and alcoholic beverages (OR=0.35[0.23; 0.54]), especially wine (OR=0.42[0.27; 0.65]). Furthermore, among consumers, stone formers reported smaller quantities of vegetables (β coeff[95% CI]= - 0.23[- 0.41; - 0.06]), coffee (β coeff= - 0.21[- 0.37; - 0.05]), teas (β coeff= - 0.52[- 0.92; - 0.11]) and alcoholic beverages (β coeff= - 0.34[- 0.63; - 0.06]). CONCLUSION Stone formers reported lower intakes of vegetables, tea, coffee, and alcoholic beverages, more specifically wine, but reported drinking more frequently soft drinks than non-stone formers. For the other food groups, stone formers and non-formers reported similar dietary intakes. Further research is needed to better understand the links between diet and kidney stone formation and develop dietary recommendations adapted to the local settings and cultural habits.
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Affiliation(s)
- Constance Legay
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland; Center for Primary Care and Public Health (Unisanté), Department of Epidemiology and Health Systems, University of Lausanne, Lausanne, Switzerland; National Center of Competence in Research NCCR Kidney.CH
| | | | - Jérôme Pasquier
- Center for Primary Care and Public Health (Unisanté), Department Formation, Research and Innovation, University of Lausanne, Lausanne, Switzerland
| | - Angeline Chatelan
- Department of Nutrition and Dietetics, Geneva School of Health Sciences, HES-SO University of Applied Sciences and Arts Western, Geneva, Switzerland; Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland
| | - Daniel G Fuster
- National Center of Competence in Research NCCR Kidney.CH; Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Nasser Dhayat
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Harald Seeger
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Alexander Ritter
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Thomas Ernandez
- Service of Nephrology, Geneva University Hospitals, Geneva, Switzerland
| | | | - Florian Buchkremer
- Nephrologie, Dialyse und Transplantation, Kantonsspital Aarau, Aarau, Switzerland
| | - Stephan Segerer
- Nephrologie, Dialyse und Transplantation, Kantonsspital Aarau, Aarau, Switzerland
| | - Grégoire Wuerzner
- Service of Nephrology and Hypertension, Lausanne University Hospital, Lausanne, Switzerland
| | - Nadia Ammor
- Service of Nephrology and Hypertension, Lausanne University Hospital, Lausanne, Switzerland
| | - Beat Roth
- Department of Urology, Lausanne University Hospital, CHUV, University of Lausanne, Switzerland
| | - Carsten A Wagner
- National Center of Competence in Research NCCR Kidney.CH; Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Olivier Bonny
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland; National Center of Competence in Research NCCR Kidney.CH; Service of Nephrology and Hypertension, Lausanne University Hospital, Lausanne, Switzerland; Service of Nephrology, Fribourg State Hospital, Fribourg, Switzerland.
| | - Murielle Bochud
- Center for Primary Care and Public Health (Unisanté), Department of Epidemiology and Health Systems, University of Lausanne, Lausanne, Switzerland; National Center of Competence in Research NCCR Kidney.CH
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6
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Dhayat NA, Bonny O, Roth B, Christe A, Ritter A, Mohebbi N, Faller N, Pellegrini L, Bedino G, Venzin RM, Grosse P, Hüsler C, Koneth I, Bucher C, Del Giorno R, Gabutti L, Mayr M, Odermatt U, Buchkremer F, Ernandez T, Stoermann-Chopard C, Teta D, Vogt B, Roumet M, Tamò L, Cereghetti GM, Trelle S, Fuster DG. Hydrochlorothiazide and Prevention of Kidney-Stone Recurrence. N Engl J Med 2023; 388:781-791. [PMID: 36856614 DOI: 10.1056/nejmoa2209275] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
BACKGROUND Nephrolithiasis is one of the most common conditions affecting the kidney and is characterized by a high risk of recurrence. Thiazide diuretic agents are widely used for prevention of the recurrence of kidney stones, but data regarding the efficacy of such agents as compared with placebo are limited. Furthermore, dose-response data are also limited. METHODS In this double-blind trial, we randomly assigned patients with recurrent calcium-containing kidney stones to receive hydrochlorothiazide at a dose of 12.5 mg, 25 mg, or 50 mg once daily or placebo once daily. The main objective was to investigate the dose-response effect for the primary end point, a composite of symptomatic or radiologic recurrence of kidney stones. Radiologic recurrence was defined as the appearance of new stones on imaging or the enlargement of preexisting stones that had been observed on the baseline image. Safety was also assessed. RESULTS In all, 416 patients underwent randomization and were followed for a median of 2.9 years. A primary end-point event occurred in 60 of 102 patients (59%) in the placebo group, in 62 of 105 patients (59%) in the 12.5-mg hydrochlorothiazide group (rate ratio vs. placebo, 1.33; 95% confidence interval [CI], 0.92 to 1.93), in 61 of 108 patients (56%) in the 25-mg group (rate ratio, 1.24; 95% CI, 0.86 to 1.79), and in 49 of 101 patients (49%) in the 50-mg group (rate ratio, 0.92; 95% CI, 0.63 to 1.36). There was no relation between the hydrochlorothiazide dose and the occurrence of a primary end-point event (P = 0.66). Hypokalemia, gout, new-onset diabetes mellitus, skin allergy, and a plasma creatinine level exceeding 150% of the baseline level were more common among patients who received hydrochlorothiazide than among those who received placebo. CONCLUSIONS Among patients with recurrent kidney stones, the incidence of recurrence did not appear to differ substantially among patients receiving hydrochlorothiazide once daily at a dose of 12.5 mg, 25 mg, or 50 mg or placebo once daily. (Funded by the Swiss National Science Foundation and Inselspital; NOSTONE ClinicalTrials.gov number, NCT03057431.).
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Affiliation(s)
- Nasser A Dhayat
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Olivier Bonny
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Beat Roth
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Andreas Christe
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Alexander Ritter
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Nilufar Mohebbi
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Nicolas Faller
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Lisa Pellegrini
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Giulia Bedino
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Reto M Venzin
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Philipp Grosse
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Carina Hüsler
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Irene Koneth
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Christian Bucher
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Rosaria Del Giorno
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Luca Gabutti
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Michael Mayr
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Urs Odermatt
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Florian Buchkremer
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Thomas Ernandez
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Catherine Stoermann-Chopard
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Daniel Teta
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Bruno Vogt
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Marie Roumet
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Luca Tamò
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Grazia M Cereghetti
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Sven Trelle
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
| | - Daniel G Fuster
- From the Departments of Nephrology and Hypertension (N.A.D., N.F., B.V., L.T., G.M.C., D.G.F.), Urology (B.R.), and Radiology (A.C.), Inselspital, Bern University Hospital, and CTU Bern (M.R., S.T.), University of Bern, Bern, Service of Nephrology, Lausanne University Hospital, University of Lausanne, Lausanne (O.B.), the Department of Nephrology, University Hospital Zurich, Zurich (A.R., N.M.), the Department of Nephrology, Regional Hospital Lugano (L.P., G.B.), and Università della Svizzera Italiana (R.D.G., L.G.), Lugano, the Department of Nephrology, Cantonal Hospital Graubünden, Chur (R.M.V., P.G.), the Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen (C.H., I.K., C.B.), the Department of Internal Medicine, Regional Hospital of Bellinzona, Bellinzona (R.D.G., L.G.), the Medical Outpatient Department, University Hospital Basel, University of Basel, Basel (M.M.), the Department of Nephrology, Luzerner Kantonsspital LUKS, Lucerne (U.O.), the Division of Nephrology, Dialysis, and Transplantation, Cantonal Hospital Aarau, Aarau (F.B.), the Department of Nephrology, University Hospital Geneva, University of Geneva, Geneva (T.E., C.S.-C.), and the Nephrology Service, Centre Hospitalier du Valais Romand, Sion (D.T.) - all in Switzerland
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Mohebbi N, Ritter A, Wiegand A, Graf N, Dahdal S, Sidler D, Arampatzis S, Hadaya K, Mueller TF, Wagner CA, Wüthrich RP. Sodium bicarbonate for kidney transplant recipients with metabolic acidosis in Switzerland: a multicentre, randomised, single-blind, placebo-controlled, phase 3 trial. Lancet 2023; 401:557-567. [PMID: 36708734 DOI: 10.1016/s0140-6736(22)02606-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 11/17/2022] [Accepted: 12/13/2022] [Indexed: 01/27/2023]
Abstract
BACKGROUND Metabolic acidosis is common in kidney transplant recipients and is associated with declining graft function. Sodium bicarbonate treatment effectively corrects metabolic acidosis, but no prospective studies have examined its effect on graft function. Therefore, we aimed to test whether sodium bicarbonate treatment would preserve graft function and slow the progression of estimated glomerular filtration rate (GFR) decline in kidney transplant recipients. METHODS The Preserve-Transplant Study was a multicentre, randomised, single-blind, placebo-controlled, phase 3 trial at three University Hospitals in Switzerland (Zurich, Bern, and Geneva), which recruited adult (aged ≥18 years) male and female long-term kidney transplant recipients if they had undergone transplantation more than 1 year ago. Key inclusion criteria were an estimated GFR between 15 mL/min per 1·73 m2 and 89 mL/min per 1·73 m2, stable allograft function in the last 6 months before study inclusion (<15% change in serum creatinine), and a serum bicarbonate of 22 mmol/L or less. We randomly assigned patients (1:1) to either oral sodium bicarbonate 1·5-4·5 g per day or matching placebo using web-based data management software. Randomisation was stratified by study centre and gender using a permuted block design to guarantee balanced allocation. We did multi-block randomisation with variable block sizes of two and four. Treatment duration was 2 years. Acid-resistant soft gelatine capsules of 500 mg sodium bicarbonate or matching 500 mg placebo capsules were given at an initial dose of 500 mg (if bodyweight was <70 kg) or 1000 mg (if bodyweight was ≥70 kg) three times daily. The primary endpoint was the estimated GFR slope over the 24-month treatment phase. The primary efficacy analyses were applied to a modified intention-to-treat population that comprised all randomly assigned participants who had a baseline visit. The safety population comprised all participants who received at least one dose of study drug. The trial is registered with ClinicalTrials.gov, NCT03102996. FINDINGS Between June 12, 2017, and July 10, 2019, 1114 kidney transplant recipients with metabolic acidosis were assessed for trial eligibility. 872 patients were excluded and 242 were randomly assigned to the study groups (122 [50%] to the placebo group and 120 [50%] to the sodium bicarbonate group). After secondary exclusion of two patients, 240 patients were included in the intention-to-treat analysis. The calculated yearly estimated GFR slopes over the 2-year treatment period were a median -0·722 mL/min per 1·73 m2 (IQR -4·081 to 1·440) and mean -1·862 mL/min per 1·73 m2 (SD 6·344) per year in the placebo group versus median -1·413 mL/min per 1·73 m2 (IQR -4·503 to 1·139) and mean -1·830 mL/min per 1·73 m2 (SD 6·233) per year in the sodium bicarbonate group (Wilcoxon rank sum test p=0·51; Welch t-test p=0·97). The mean difference was 0·032 mL/min per 1·73 m2 per year (95% CI -1·644 to 1·707). There were no significant differences in estimated GFR slopes in a subgroup analysis and a sensitivity analysis confirmed the primary analysis. Although the estimated GFR slope did not show a significant difference between the treatment groups, treatment with sodium bicarbonate effectively corrected metabolic acidosis by increasing serum bicarbonate from 21·3 mmol/L (SD 2·6) to 23·0 mmol/L (2·7) and blood pH from 7·37 (SD 0·06) to 7·39 (0·04) over the 2-year treatment period. Adverse events and serious adverse events were similar in both groups. Three study participants died. In the placebo group, one (1%) patient died from acute respiratory distress syndrome due to SARS-CoV-2 and one (1%) from cardiac arrest after severe dehydration following diarrhoea with hypotension, acute kidney injury, and metabolic acidosis. In the sodium bicarbonate group, one (1%) patient had sudden cardiac death. INTERPRETATION In adult kidney transplant recipients, correction of metabolic acidosis by treatment with sodium bicarbonate over 2 years did not affect the decline in estimated GFR. Thus, treatment with sodium bicarbonate should not be generally recommended to preserve estimated GFR (a surrogate marker for graft function) in kidney transplant recipients with chronic kidney disease who have metabolic acidosis. FUNDING Swiss National Science Foundation.
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Affiliation(s)
- Nilufar Mohebbi
- Division of Nephrology, University Hospital, Zurich, Switzerland.
| | - Alexander Ritter
- Division of Nephrology, University Hospital, Zurich, Switzerland
| | - Anna Wiegand
- Division of Nephrology, University Hospital, Zurich, Switzerland
| | | | - Suzan Dahdal
- Division of Nephrology and Hypertension, Inselspital, Bern, Switzerland
| | - Daniel Sidler
- Division of Nephrology and Hypertension, Inselspital, Bern, Switzerland
| | | | - Karine Hadaya
- Division of Nephrology and Hypertension, University Hospital, Geneva, Switzerland
| | - Thomas F Mueller
- Division of Nephrology, University Hospital, Zurich, Switzerland
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland
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8
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Bonny O, Fuster D, Seeger H, Ernandez T, Buchkremer F, Wuerzner G, Dhayat N, Ritter A, Stoermann C, Segerer S, Häusermann T, Pasch A, Kim M, Mayr M, Krapf R, Roth B, Bochud M, Mohebbi N, Wagner CA. The Swiss Kidney Stone Cohort: A Longitudinal, Multicentric, Observational Cohort to Study Course and Causes of Kidney Stone Disease in Switzerland. Kidney Blood Press Res 2023; 48:194-201. [PMID: 36780886 DOI: 10.1159/000529094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 12/22/2022] [Indexed: 02/15/2023] Open
Abstract
BACKGROUND Kidney stone disease has a high prevalence worldwide of approximately 10% of the population and is characterized by a high recurrence rate. Kidney stone disease results from a combination of genetic, environmental, and lifestyle risk factors, and the dissection of these factors is complex. METHODS The Swiss Kidney Stone Cohort (SKSC) is an investigator-initiated prospective, multicentric longitudinal, observational study in patients with kidney stones followed with regular visits over a period of 3 years after inclusion. Ongoing follow-ups by biannual telephone interviews will provide long-term outcome data. SKSC comprises 782 adult patients (age >18 years) with either recurrent stones or a single stone event with at least one risk factor for recurrence. In addition, a control cohort of 207 individuals without kidney stone history and absence of kidney stones on a low-dose CT scan at enrolment has also been recruited. SKSC includes extensive collections of clinical data, biochemical data in blood and 24-h urine samples, and genetic data. Biosamples are stored at a dedicated biobank. Information on diet and dietary habits was collected through food frequency questionnaires and standardized recall interviews by trained dieticians with the Globodiet software. CONCLUSION SKSC provides a unique opportunity and resource to further study cause and course of kidney disease in a large population with data and samples collected of a homogeneous collective of patients throughout the whole Swiss population.
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Affiliation(s)
- Olivier Bonny
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
- Service of Nephrology and Hypertension, Lausanne University Hospital, Lausanne, Switzerland
- Service of Nephrology, Fribourg State Hospital, Fribourg, Switzerland
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
| | - Daniel Fuster
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
- Department of Nephrology and Hypertension, University Hospital Bern and University of Bern, Bern, Switzerland
| | - Harald Seeger
- Department of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Thomas Ernandez
- Service of Nephrology, Geneva University Hospitals, Geneva, Switzerland
| | | | - Gregoire Wuerzner
- Service of Nephrology and Hypertension, Lausanne University Hospital, Lausanne, Switzerland
| | - Nasser Dhayat
- Department of Nephrology and Hypertension, University Hospital Bern and University of Bern, Bern, Switzerland
- Nephrology & Renal Care Center, B. Braun Medical Care AG, Hochfelden, Switzerland
| | - Alexander Ritter
- Department of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | | | - Stephan Segerer
- Division of Nephrology, Cantonal Hospital Aarau, Aarau, Switzerland
| | - Tanja Häusermann
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
| | - Andreas Pasch
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
- Calciscon AG, Biel, Switzerland
| | - Minjeong Kim
- Division of Nephrology, Cantonal Hospital Aarau, Aarau, Switzerland
- Medical Outpatient Clinic, Basel University Hospital, Basel, Switzerland
| | - Michael Mayr
- Medical Outpatient Clinic, Basel University Hospital, Basel, Switzerland
| | - Reto Krapf
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
| | - Beat Roth
- Department of Urology, Lausanne University Hospital, Lausanne, Switzerland
| | - Murielle Bochud
- Centre for Primary Care and Public Health (Unisanté), University of Lausanne, Lausanne, Switzerland
| | - Nilufar Mohebbi
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
- Department of Nephrology and Hypertension, University Hospital Bern and University of Bern, Bern, Switzerland
| | - Carsten A Wagner
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
- Institute of Physiology, University of Zurich, Zurich, Switzerland
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9
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Abstract
Kidneys are central in the regulation of multiple physiological functions, such as removal of metabolic wastes and toxins, maintenance of electrolyte and fluid balance, and control of pH homeostasis. In addition, kidneys participate in systemic gluconeogenesis and in the production or activation of hormones. Acid-base conditions influence all these functions concomitantly. Healthy kidneys properly coordinate a series of physiological responses in the face of acute and chronic acid-base disorders. However, injured kidneys have a reduced capacity to adapt to such challenges. Chronic kidney disease patients are an example of individuals typically exposed to chronic and progressive metabolic acidosis. Their organisms undergo a series of alterations that brake large detrimental changes in the homeostasis of several parameters, but these alterations may also operate as further drivers of kidney damage. Acid-base disorders lead not only to changes in mechanisms involved in acid-base balance maintenance, but they also affect multiple other mechanisms tightly wired to it. In this review article, we explore the basic renal activities involved in the maintenance of acid-base balance and show how they are interconnected to cell energy metabolism and other important intracellular activities. These intertwined relationships have been investigated for more than a century, but a modern conceptual organization of these events is lacking. We propose that pH homeostasis indissociably interacts with central pathways that drive progression of chronic kidney disease, such as inflammation and metabolism, independent of etiology.
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Affiliation(s)
- Pedro Henrique Imenez Silva
- Institute of Physiology, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland.
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland.
| | - Nilufar Mohebbi
- National Center of Competence in Research NCCR Kidney.CH, Zurich, Switzerland
- Praxis Und Dialysezentrum Zurich, Zurich, Switzerland
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10
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Metry EL, Garrelfs SF, Peters-Sengers H, Hulton SA, Acquaviva C, Bacchetta J, Beck BB, Collard L, Deschênes G, Franssen C, Kemper MJ, Lipkin GW, Mandrile G, Mohebbi N, Moochhala SH, Oosterveld MJ, Prikhodina L, Hoppe B, Cochat P, Groothoff JW. Long-Term Transplantation Outcomes in Patients With Primary Hyperoxaluria Type 1 Included in the European Hyperoxaluria Consortium (OxalEurope) Registry. Kidney Int Rep 2021; 7:210-220. [PMID: 35155860 PMCID: PMC8821040 DOI: 10.1016/j.ekir.2021.11.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/28/2021] [Accepted: 11/01/2021] [Indexed: 12/20/2022] Open
Abstract
Introduction In primary hyperoxaluria type 1 (PH1), oxalate overproduction frequently causes kidney stones, nephrocalcinosis, and kidney failure. As PH1 is caused by a congenital liver enzyme defect, combined liver–kidney transplantation (CLKT) has been recommended in patients with kidney failure. Nevertheless, systematic analyses on long-term transplantation outcomes are scarce. The merits of a sequential over combined procedure regarding kidney graft survival remain unclear as is the place of isolated kidney transplantation (KT) for patients with vitamin B6-responsive genotypes. Methods We used the OxalEurope registry for retrospective analyses of patients with PH1 who underwent transplantation. Analyses of crude Kaplan–Meier survival curves and adjusted relative hazards from the Cox proportional hazards model were performed. Results A total of 267 patients with PH1 underwent transplantation between 1978 and 2019. Data of 244 patients (159 CLKTs, 48 isolated KTs, 37 sequential liver–KTs [SLKTs]) were eligible for comparative analyses. Comparing CLKTs with isolated KTs, adjusted mortality was similar in patients with B6-unresponsive genotypes but lower after isolated KT in patients with B6-responsive genotypes (adjusted hazard ratio 0.07, 95% CI: 0.01–0.75, P = 0.028). CLKT yielded higher adjusted event-free survival and death-censored kidney graft survival in patients with B6-unresponsive genotypes (P = 0.025, P < 0.001) but not in patients with B6-responsive genotypes (P = 0.145, P = 0.421). Outcomes for 159 combined procedures versus 37 sequential procedures were comparable. There were 12 patients who underwent pre-emptive liver transplantation (PLT) with poor outcomes. Conclusion The CLKT or SLKT remains the preferred transplantation modality in patients with PH1 with B6-unresponsive genotypes, but isolated KT could be an alternative approach in patients with B6-responsive genotypes.
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11
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Silva PHI, Wiegand A, Daryadel A, Russo G, Ritter A, Gaspert A, Wüthrich RP, Wagner CA, Mohebbi N. Acidosis and alkali therapy in patients with kidney transplant is associated with transcriptional changes and altered abundance of genes involved in cell metabolism and acid-base balance. Nephrol Dial Transplant 2021; 36:1806-1820. [PMID: 34240183 DOI: 10.1093/ndt/gfab210] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Metabolic acidosis occurs frequently in patients with kidney transplant and is associated with higher risk for and accelerated loss of graft function. To date, it is not known whether alkali therapy in these patients improves kidney function and whether acidosis and its therapy is associated with altered expression of proteins involved in renal acid-base metabolism. METHODS We collected retrospectively kidney biopsies from 22 patients. Of these patients, 9 had no acidosis, 9 had metabolic acidosis (plasma HCO3- < 22 mmol/l), and 4 had acidosis and received alkali therapy. We performed transcriptome analysis and immunohistochemistry for proteins involved in renal acid-base handling. RESULTS We found the expression of 40 transcripts significantly changed between kidneys from non-acidotic and acidotic patients. These genes are mostly involved in proximal tubule amino acid and lipid metabolism and energy homeostasis. Three transcripts were fully recovered by alkali therapy: the Kir4.2 K+-channel, an important regulator of proximal tubule HCO3--metabolism and transport, ACADSB and SHMT1, genes involved in beta-oxidation and methionine metabolism. Immunohistochemistry showed reduced staining for the proximal tubule NBCe1 HCO3- transporter in kidneys from acidotic patients that recovered with alkali therapy. In addition, the HCO3-exchanger pendrin was affected by acidosis and alkali therapy. CONCLUSIONS Metabolic acidosis in kidney transplant recipients is associated with alterations in the renal transcriptome that are partly restored by alkali therapy. Acid-base transport proteins mostly from proximal tubule were also affected by acidosis and alkali therapy suggesting that the downregulation of critical players contributes to metabolic acidosis in these patients.
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Affiliation(s)
- Pedro H Imenez Silva
- Institute of Physiology, University of Zurich, Zurich, Switzerland.,National Center of Competence in Research NCCR Kidney.CH, Switzerland
| | - Anna Wiegand
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Arezoo Daryadel
- Institute of Physiology, University of Zurich, Zurich, Switzerland.,National Center of Competence in Research NCCR Kidney.CH, Switzerland
| | - Giancarlo Russo
- Functional Genomics Center Zürich, University of Zürich and ETH Zürich, Zürich, Switzerland
| | - Alexander Ritter
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Ariana Gaspert
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Rudolf P Wüthrich
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland.,National Center of Competence in Research NCCR Kidney.CH, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
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12
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Imenez Silva PH, Wiegand A, Daryadel A, Gaspert A, Russo G, Wuthrich RP, Wagner C, Mohebbi N. FC 001ACIDOSIS AND ALKALI THERAPY ARE ASSOCIATED WITH TRANSCRIPTIONAL CHANGES AND ALTERED ABUNDANCE OF GENES INVOLVED IN CELL METABOLISM AND BICARBONATE TRANSPORT IN KIDNEY TRANSPLANT RECIPIENTS. Nephrol Dial Transplant 2021. [DOI: 10.1093/ndt/gfab142.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background and Aims
Metabolic acidosis is a common event in kidney transplant recipients and has been associated to a higher risk of graft loss and mortality. In patients with CKD and acidosis, alkali therapy ameliorating acidosis appears to protect kidney function. However, it is still poorly understood how acidosis causes the detrimental effects to kidney graft function and how alkali therapy would interact with these mechanisms. Here we aim to identify transcriptomic alterations in kidney transplant recipients without metabolic acidosis in comparison to patients with metabolic acidosis with and without alkali therapy. Moreover, we examined immunolocalization of key proteins involved in acid-base base regulation in biopsies from these patients.
Method
We obtained 22 biopsies of patients 4-6 years after kidney transplantation. Among these patients, nine were not acidotic (serum [HCO3-] ≥ 22 mM), nine had acidosis ([HCO3-] < 22 mM), and four had acidosis and received sodium bicarbonate (alkali therapy) fully correcting acidosis. Age, immunosuppressive drugs, time after transplantation, and eGFR were not statistically different between groups. RNA was extracted from biopsies and RNAseq was performed. Immunohistochemistry was performed for key proteins involved in the renal regulation of acid-base balance. Additionally, a control group of 6 non-transplanted healthy kidneys was included in the histology analysis.
Results
RNAseq analysis revealed 40 genes differentially expressed between acidosis and no acidosis groups. While most of the genes tended to be recovered by alkali therapy, only three fully recovered with bicarbonate supplementation (p-value < 0.05 and log2(fold change) above 0.5). These genes were KCNJ15 (Kir4.2), SHMT1, and ACADSB. Renal localization of the genes was determined using single-cell RNA sequencing data (Ransick et al., Developmental Cell, 2019, doi.org/10.1016/j.devcel.2019.10.005). Most of the genes were expressed in the proximal tubule and were organized in the model shown in Figure 1A. Several of these genes participate in cell metabolism, such as beta-oxidation, and iron, folate, and methionine metabolism. Moreover, the K+-channel Kir4.2 regulates the activity of the electrogenic sodium bicarbonate cotransporter 1 (NBCe1, SLC4A4) and ammoniagenesis in renal proximal tubules. Immunofluorescence analysis showed that NBCe1 expression in proximal tubules was strongly reduced in patients who developed acidosis and was partially recovered in patients who received alkali therapy (Figure 1B). In type B intercalated cells, a similar pattern was observed for Pendrin (SLC26A4). No alteration in the expression of GDH (GLUD1), AE1 (SLC4A1), AQP2, CA2, RhCG (SLC42A3), and B1 subunit of the H+ATPase (ATP6V1B1) was observed in kidneys of treated or untreated patients with acidosis.
Conclusion
Kidney transplant recipients suffering from metabolic acidosis show distinct expression pattern of genes involved in cell metabolism and acid-base transport.
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Affiliation(s)
- Pedro Henrique Imenez Silva
- University of Zurich, Institute of Physiology, Switzerland
- National Center of Competence in Research NCCR Kidney.CH, Switzerland
| | - Anna Wiegand
- University Hospital of Zurich, Division of Nephrology, Switzerland
| | - Arezoo Daryadel
- University of Zurich, Institute of Physiology, Switzerland
- National Center of Competence in Research NCCR Kidney.CH, Switzerland
| | - Ariana Gaspert
- University Hospital of Zurich, Institute of Pathology and Molecular Pathology, Switzerland
| | - Giancarlo Russo
- University of Zurich, Functional Genomics Center Zürich, Switzerland
| | | | - Carsten Wagner
- University of Zurich, Institute of Physiology, Switzerland
- National Center of Competence in Research NCCR Kidney.CH, Switzerland
| | - Nilufar Mohebbi
- University Hospital of Zurich, Division of Nephrology, Switzerland
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13
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Mohebbi N. [Risk factors for urolithiasis]. Ther Umsch 2021; 78:223-227. [PMID: 34032133 DOI: 10.1024/0040-5930/a001264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Risk factors for urolithiasis Abstract. The prevalence and incidence of kidney stones has continuously increased over the last years. Recent evidence suggests that kidney stones have a substantial morbidity including chronic kidney disease and end stage kidney disease as well as significantly increased risk for cardiovascular diseases. Thus, risk stratification - especially of high-risk patients - is mandatory in the management of kidney stone patients. There is a huge variety in risk factors for nephrolithiasis including general factors (such as young age at manifestation, familial disposition), genetic or acquired diseases with risk of stone formation, drugs etc. Several prediction scores have been developed to assess recurrence risk in kidney stone formers. However, only very few studies have investigated these tools and more evidence is needed in future to proof if these scores reliably predict stone recurrence risk.
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14
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Ritter A, Vargas-Poussou R, Mohebbi N, Seeger H. Recurrent Nephrolithiasis in a Patient With Hypercalcemia and Normal to Mildly Elevated Parathyroid Hormone. Am J Kidney Dis 2021; 77:A13-A15. [PMID: 34024353 DOI: 10.1053/j.ajkd.2020.09.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 09/02/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Alexander Ritter
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland.
| | - Rosa Vargas-Poussou
- Hôpital Européen Georges Pompidou, Département de Génétique, INSERM UMR 970, Paris, France
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Harald Seeger
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
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15
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Ritter A, Mohebbi N. Causes and Consequences of Metabolic Acidosis in Patients after Kidney Transplantation. Kidney Blood Press Res 2020; 45:792-801. [PMID: 33040055 DOI: 10.1159/000510158] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 07/01/2020] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Metabolic acidosis (MA) is a common complication in kidney transplantation (KTx). It is more prevalent in KTx than in CKD, and it occurs at higher glomerular filtration rates. The pathophysiologic understanding of MA in KTx and its clinical impact has been highlighted by few recent studies. However, no guidelines exist yet for the treatment of MA after KTx. SUMMARY MA in KTx seems to share pathophysiologic mechanisms with CKD, such as impaired ammoniagenesis. Additional kidney transplant-specific factors seem to alter not only the prevalence but also the phenotype of MA, which typically shows features of renal tubular acidosis. There is evidence that calcineurin inhibitors, immunological factors, process of donation, donor characteristics, and diet may contribute to MA occurrence. According to several mainly observational studies, MA seems to play a role in disturbed bone metabolism, cardiovascular morbidity, declining graft function, and mortality. A better understanding of the pathophysiology and evidence from randomized controlled trials, in particular, are needed to clarify the role of MA and the potential benefit of alkali treatment in KTx. Alkali therapy might not only be beneficial but also cost effective and safe. Key Messages: MA seems to be associated with several negative outcomes in KTx. A deeper understanding of the pathophysiology and clinical consequences of MA in KTx is crucial. Clinical trials will have to determine the potential benefits of alkali therapy.
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Affiliation(s)
- Alexander Ritter
- Division of Nephrology, University Hospital of Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital of Zurich, Zurich, Switzerland, .,Praxis und Dialysezentrum Zürich-City, Zurich, Switzerland,
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16
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Genini A, Mohebbi N, Daryadel A, Bettoni C, Wagner CA. Adaptive response of the murine collecting duct to alkali loading. Pflugers Arch 2020; 472:1079-1092. [DOI: 10.1007/s00424-020-02423-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/31/2020] [Accepted: 06/19/2020] [Indexed: 01/14/2023]
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17
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Wiegand A, Daryadel A, Imenez da Silva PH, Gaspert A, Wuthrich RP, Wagner C, Mohebbi N. P0004REDUCED EXPRESSION OF PROXIMAL ACID-BASE TRANSPORT PROTEINS IN KIDNEY TRANSPLANT PATIENTS WITH METABOLIC ACIDOSIS. Nephrol Dial Transplant 2020. [DOI: 10.1093/ndt/gfaa142.p0004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background and Aims
Metabolic acidosis (MA) is a frequent complication of chronic kidney disease and an independent risk factor for kidney disease progression and mortality. MA is highly prevalent after kidney transplantation (12%-58%)(1). However, there are scarcely any data available on the underlying pathomechanisms and in particular molecular mechanisms involved in metabolic acidosis after kidney transplantation. Thus, we wanted to investigate the expression of key acid base transport proteins in kidney biopsies of kidney transplant recipients with and without metabolic acidosis.
Method
We evaluated 22 kidney transplant biopsies including 9 biopsies from kidney transplant recipients (KTR) with MA, nine biopsies from KTRs without MA (control) and four biopsies from KTRs with MA that were consequently subjected to alkali therapy (Alkali therapy). Immunofluorescence staining was used to identify key renal acid-base transport proteins. Additionally, six control kidneys were analyzed. Immunofluorescence staining was used to identify key renal acid-base transport proteins along the nephron. In addition, RNA extraction and full RNA sequencing analysis of all biopsies –where available- was performed.
Results
In the proximal tubule, we observed reduced immunostaining for the sodium bicarbonate cotransporter NBCe1 (SLC4A4) in the MA group compared to the control and alkali group, whereas the alkali group demonstrated the strongest staining of all three groups. In the distal nephron, expression of the chloride/bicarbonate exchanger Pendrin (SLC26A4) and the B1 subunit of the V-ATPase (ATP6V1B1) were markedly stronger in the alkali and control group compared to the MA group.
Expression of other acid base proteins such as Renal ammonia transporter RhCG (SLC42A3), Carbonic Anhydrase II, Glutamate dehydrogenase, anion exchanger AE1 (SLC4A1) and the B2 subunit of the V-ATPase (ATP6V1B2) showed no difference among all groups. Interestingly, the B2 subunit was absent in the proximal tubule in transplant biopsies of all groups.
In kidney biopsies of transplant recipients with metabolic acidosis RNA abundance of NBCe1, CAII and Pendrin was lower while RhCG and B1 RNA counts were not different when compared to recipients without metabolic acidosis.
Conclusion
Our data demonstrate altered protein and mRNA expression of several key acid base transporters in kidney biopsies of transplant recipients with metabolic acidosis. Treatment with alkali may have the potential to reverse or prevent these changes in renal allografts after transplantation.
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Affiliation(s)
- Anna Wiegand
- University Hospital of Zürich, Division of Nephrology, Zürich, Switzerland
| | - Arezoo Daryadel
- University of Zurich, Institute of Physiology, Zürich, Switzerland
| | | | - Ariana Gaspert
- University Hospital of Zürich, Institute of Pathology and Molecular Pathology, Zürich, Switzerland
| | | | - Carsten Wagner
- University of Zurich, Institute of Physiology, Zürich, Switzerland
| | - Nilufar Mohebbi
- University Hospital of Zürich, Division of Nephrology, Zürich, Switzerland
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18
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Wiegand A, Graf N, Bonani M, Frey D, Wüthrich RP, Mohebbi N. Relationship of Serum Bicarbonate Levels with 1-Year Graft Function in Kidney Transplant Recipients in Switzerland. Kidney Blood Press Res 2019; 44:1179-1188. [PMID: 31536994 DOI: 10.1159/000502527] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/06/2019] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Metabolic acidosis (MA) is common in kidney transplant recipients (KTRs). Several studies have shown that MA is involved in the progression of chronic kidney disease. However, it is unclear if there is also a relationship between serum bicarbonate and graft function after kidney transplantation (KTx). We hypothesized that low serum bicarbonate is associated with a lower estimated glomerular filtration rate (eGFR) 1 year after KTx. METHODS We performed a post hoc analysis of a single-center, open-label randomized trial in 90 KTRs and investigated the relationship of serum bicarbonate and graft function in the first year after KTx. RESULTS Prevalence of MA was high after KTx (63%) and decreased to 28% after 1 year. Bicarbonate (20.6 ± 3.0 to 22.7 ± 2.7 mmol/L) increased in the first year after transplantation whereas eGFR (53.4 ± 15.8 to 56.9 ± 18.5 mL/min/1.73 m2) did not change significantly. Higher serum bicarbonate (p = 0.029) was associated with higher eGFR in the first year after KTx. CONCLUSION Prevalence of MA is high in KTRs. In the first year after KTx, serum bicarbonate was positively correlated with eGFR, suggesting a potential role of MA in kidney graft function.
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Affiliation(s)
- Anna Wiegand
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | | | - Marco Bonani
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Diana Frey
- Division of Rheumatology, University Hospital Zurich, Zurich, Switzerland
| | - Rudolf P Wüthrich
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland,
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19
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Sidler M, Mohebbi N, Hoorn EJ, Wagner CA. Gut It Out: Laxative Abuse Mimicking Distal Renal Tubular Acidosis. Kidney Blood Press Res 2019; 44:1294-1299. [PMID: 31480048 DOI: 10.1159/000501855] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 07/01/2019] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Distal renal tubular acidosis (dRTA) can be inherited or acquired. CASE PRESENTATION Here, we describe the case of a 45-year-old female patient with non-anion gap metabolic acidosis, hypokalemia, and alkaline urine. She had a history of rheumatoid arthritis and kidney stones and failed to acidify urine upon the fludrocortisone and furosemide test. Therefore, the diagnosis of dRTA secondary to an autoimmune disease was made. A kidney biopsy was examined for markers of acid-secretory intercalated cells. Surprisingly, no obvious difference in the relative number of acid-secretory intercalated cells or in the distribution of major proteins involved in acid secretion was found. Furthermore, increasing doses of potassium citrate failed to correct the hypokalemia and acidosis. Since these findings were rather atypical for autoimmune dRTA, alternative causes of her hypokalemia and metabolic acidosis were sought. The patient was found to chronically consume laxatives, which can also cause kidney stones and may result in a false-positive urinary acidification test. CONCLUSION Chronic laxative abuse may mimic dRTA and should therefore be considered in unexplained hypokalemia with non-anion gap metabolic acidosis.
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Affiliation(s)
- Marius Sidler
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Ewout J Hoorn
- Division of Nephrology and Transplantation, Department of Internal Medicine, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland,
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20
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Wiegand A, Fischer G, Seeger H, Fuster D, Dhayat N, Bonny O, Ernandez T, Kim MJ, Wagner CA, Mohebbi N. Impact of potassium citrate on urinary risk profile, glucose and lipid metabolism of kidney stone formers in Switzerland. Clin Kidney J 2019; 13:1037-1048. [PMID: 33391747 PMCID: PMC7769539 DOI: 10.1093/ckj/sfz098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 07/08/2019] [Indexed: 01/25/2023] Open
Abstract
Background Hypocitraturia and hypercalciuria are the most prevalent risk factors in kidney stone formers (KSFs). Citrate supplementation has been introduced for metaphylaxis in KSFs. However, beyond its effects on urinary parameters and stone recurrence, only a few studies have investigated the impact of citrate on other metabolic pathways such as glucose or lipid metabolism. Methods We performed an observational study using data from the Swiss Kidney Stone Cohort. Patients were subdivided into two groups based on treatment with potassium citrate or not. The outcomes were changes of urinary risk parameters, haemoglobin A1c (HbA1c), fasting glucose, cholesterol and body mass index (BMI). Results Hypocitraturia was present in 19.3% of 428 KSFs and potassium citrate was administered to 43 patients (10.0%) at a mean dosage of 3819 ± 1796 mg/day (corresponding to 12.5 ± 5.9 mmol/ day). Treatment with potassium citrate was associated with a significantly higher mean change in urinary citrate (P = 0.010) and urinary magnesium (P = 0.020) compared with no potassium citrate treatment. Exogenous citrate administration had no effect on cholesterol, fasting glucose, HbA1c and BMI. Multiple linear regression analysis demonstrated no significant association of 1,25-dihydroxyvitamin D3 [1,25(OH)2 D3] levels with urinary citrate excretion. Conclusion Potassium citrate supplementation in KSFs in Switzerland resulted in a beneficial change of the urinary risk profile by particularly increasing anti-lithogenic factors. Fasting glucose, HbA1c, cholesterol levels and BMI were unaffected by potassium citrate therapy after 3 months, suggesting that potassium citrate is safe and not associated with unfavourable metabolic side effects. Lastly, 1,25(OH)2 D3 levels were not associated with urinary citrate excretion.
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Affiliation(s)
- Anna Wiegand
- Division of Nephrology, University Hospital of Zurich, Zurich, Switzerland
| | - Gioia Fischer
- Division of Nephrology, University Hospital of Zurich, Zurich, Switzerland
| | - Harald Seeger
- Division of Nephrology, University Hospital of Zurich, Zurich, Switzerland.,Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland
| | - Daniel Fuster
- Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland.,Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Nasser Dhayat
- Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland.,Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Olivier Bonny
- Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland.,Service of Nephrology, University Hospital of Lausanne, Lausanne, Switzerland
| | - Thomas Ernandez
- Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland.,Service of Nephrology, University Hospital of Geneva, Geneva, Switzerland
| | - Min-Jeong Kim
- Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland.,Clinic for Transplantation Immunology and Nephrology, University Hospital Basel, Basel, Switzerland
| | - Carsten A Wagner
- Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland.,Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital of Zurich, Zurich, Switzerland.,Swiss Kidney Stone Cohort, National Center of Competence in Research, NCCR-Kidney, Switzerland
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21
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Elitok S, Sidler M, Bieringer M, Mohebbi N, Schneider W, Wagner CA. A patient with chronic kidney disease, primary biliary cirrhosis and metabolic acidosis. Clin Kidney J 2019; 13:463-467. [PMID: 32699627 PMCID: PMC7367120 DOI: 10.1093/ckj/sfz059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 04/17/2019] [Indexed: 11/14/2022] Open
Abstract
Autoimmune disorders such as rheumatoid arthritis or Sjögren's syndrome can be associated with impaired renal acid excretion. Only few cases of patients with primary biliary cirrhosis (PBC) and distal renal tubular acidosis (dRTA) have been described. Here, we present the case of a 60-year-old woman with PBC and dRTA. Her kidney biopsy showed an absence of markers of acid-secretory Type A intercalated cells (A-ICs) and expression of aquaporin-2, a marker of principal cells, in all cells lining the collecting duct. Moreover, the serum of the patient contained antibodies directed against a subset of cells of the collecting duct. Thus, PBC-related autoantibodies may target acid-secretory A-ICs and thereby impair urinary acidification.
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Affiliation(s)
- Saban Elitok
- Department of Nephrology and Endocrinology/Diabetology, Klinikum Ernst von Bergmann, Potsdam, Germany
- Correspondence and offprint requests to: Saban Elitok; E-mail: , Carsten A. Wagner; E-mail:
| | - Marius Sidler
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | | | - Nilufar Mohebbi
- Institute of Physiology, University of Zurich, Zurich, Switzerland
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | | | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland
- Correspondence and offprint requests to: Saban Elitok; E-mail: , Carsten A. Wagner; E-mail:
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22
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Ferraro PM, Arrabal-Polo MÁ, Capasso G, Croppi E, Cupisti A, Ernandez T, Fuster DG, Galan JA, Grases F, Hoorn EJ, Knauf F, Letavernier E, Mohebbi N, Moochhala S, Petkova K, Pozdzik A, Sayer J, Seitz C, Strazzullo P, Trinchieri A, Vezzoli G, Vitale C, Vogt L, Unwin RJ, Bonny O, Gambaro G. A preliminary survey of practice patterns across several European kidney stone centers and a call for action in developing shared practice. Urolithiasis 2019; 47:219-224. [PMID: 30848320 DOI: 10.1007/s00240-019-01119-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Accepted: 02/08/2019] [Indexed: 11/24/2022]
Abstract
Currently an evidence-based approach to nephrolithiasis is hampered by a lack of randomized controlled trials. Thus, there is a need for common platforms for data sharing and recruitment of patients to interventional studies. A first step in achieving this objective would be to share practice methods and protocols for subsequent standardization in what is still a heterogeneous clinical field. Here, we present the results of a pilot survey performed across 24 European clinical kidney stone centers. The survey was distributed by a voluntary online questionnaire circulated between June 2017 and January 2018. About 46% of centers reported seeing on average 20 or more patients per month. Only 21% adopted any formal referral criteria. Centers were relatively heterogeneous in respect of the definition of an incident stone event. The majority (71%) adopted a formal follow-up scheme; of these, 65% included a follow-up visit at 3 and 12 months, and 41% more than 12 months. In 79% of centers some kind of imaging was performed systematically. 75% of all centers performed laboratory analyses on blood samples at baseline and during follow-up. All centers performed laboratory analyses on 24-h urine samples, the majority (96%) at baseline and during follow-up. There was good correspondence across centers for analyses performed on 24-h urine samples, although the methods of 24-h urine collection and analysis were relatively heterogeneous. Our survey among 24 European stone centers highlights areas of homogeneity and heterogeneity that will be investigated further. Our aim is the creation of a European network of stone centers sharing practice patterns and hosting a common database for research and guidance in clinical care.
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Affiliation(s)
- Pietro Manuel Ferraro
- U.O.C. Nefrologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Via G. Moscati 31, 00168, Roma, Italy. .,Università Cattolica del Sacro Cuore, Roma, Italy.
| | - Miguel Ángel Arrabal-Polo
- Lithotripsy and Endourology Unit, Department of Urology, San Cecilio University Hospital, Granada, Spain
| | - Giovambattista Capasso
- Division of Nephrology, Department of Cardio-thoracic and Respiratory Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy
| | | | - Adamasco Cupisti
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Thomas Ernandez
- Service of Nephrology, University hospital of Geneva, Geneva, Switzerland
| | - Daniel G Fuster
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Juan Antonio Galan
- Urolithiasis and Endourology Unit, General University Hospital, Alicante, Spain
| | - Felix Grases
- Laboratory of Renal Lithiasis Research, University Institute of Health Sciences Research, Palma de Mallorca, Spain
| | - Ewout J Hoorn
- Department of Internal Medicine, Division of Nephrology and Transplantation, Erasmus medical center, Rotterdam, The Netherlands
| | - Felix Knauf
- Department of Nephrology and Medical Intensive Care, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | | | - Kremena Petkova
- Department of Urology and Nephrology, Military Medical Academy, Sofia, Bulgaria
| | - Agnieszka Pozdzik
- Nephrology Clinic, Hôpital Brugmann, Kidney Stones Clinic, Centre Hospitalier Universitaire, Université Libre de Bruxelles, Brussels, Belgium
| | - John Sayer
- Newcastle upon Tyne Hospitals NHS Foundation Trust, NE7 7DN, Newcastle, UK.,Institute of Genetic Medicine, Newcastle University, Central Parkway, NE1 3BZ, Newcastle, UK.,NIHR Newcastle Biomedical Research Centre, Campus for Ageing and Vitality, Newcastle, NE4 5PL, UK
| | - Christian Seitz
- Department of Urology, Medical University of Vienna, Währinger Gurtel 18-20 in, 1090, Vienna, Austria
| | - Pasquale Strazzullo
- Department of Clinical Medicine and Surgery, Federico II University of Naples, Naples, Italy
| | | | - Giuseppe Vezzoli
- Nephrology and Dialysis Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Corrado Vitale
- Nephrology and Dialysis Unit, AO Ordine Mauriziano, Torino, Italy
| | - Liffert Vogt
- Amsterdam Cardiovascular Sciences, Dept of Internal Medicine, section Nephrology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Robert J Unwin
- Kidney and Urology Centre, Royal Free Hospital, London, UK
| | - Olivier Bonny
- Service of Nephrology, Department of Medicine, Lausanne University Hospital, Lausanne, Switzerland
| | - Giovanni Gambaro
- U.O.C. Nefrologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Via G. Moscati 31, 00168, Roma, Italy.,Università Cattolica del Sacro Cuore, Roma, Italy
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23
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Dhayat NA, Faller N, Bonny O, Mohebbi N, Ritter A, Pellegrini L, Bedino G, Schönholzer C, Venzin RM, Hüsler C, Koneth I, Del Giorno R, Gabutti L, Amico P, Mayr M, Odermatt U, Buchkremer F, Ernandez T, Stoermann-Chopard C, Teta D, Rintelen F, Roumet M, Irincheeva I, Trelle S, Tamò L, Roth B, Vogt B, Fuster DG. Efficacy of standard and low dose hydrochlorothiazide in the recurrence prevention of calcium nephrolithiasis (NOSTONE trial): protocol for a randomized double-blind placebo-controlled trial. BMC Nephrol 2018; 19:349. [PMID: 30526528 PMCID: PMC6288917 DOI: 10.1186/s12882-018-1144-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 11/20/2018] [Indexed: 11/13/2022] Open
Abstract
Background Nephrolithiasis is a global healthcare problem with a current lifetime risk of 18.8% in men and 9.4% in women. Given the high cost of medical treatments and surgical interventions as well as the morbidity related to symptomatic stone disease, medical prophylaxis for stone recurrence is an attractive approach. Thiazide diuretics have been the cornerstone of pharmacologic metaphylaxis for more than 40 years. However, evidence for benefits and harms of thiazides in the prevention of calcium containing kidney stones in general remains unclear. In addition, the efficacy of the currently employed low dose thiazide regimens to prevent stone recurrence is not known. Methods The NOSTONE trial is an investigator-initiated 3-year prospective, multicenter, double-blind, placebo-controlled trial to assess the efficacy of standard and low dose hydrochlorothiazide treatment in the recurrence prevention of calcium containing kidney stones. We plan to include 416 adult (≥ 18 years) patients with recurrent (≥ 2 stone episodes in the last 10 years) calcium containing kidney stones (containing ≥50% of calcium oxalate, calcium phosphate or a mixture of both). Patients will be randomly allocated to 50 mg or 25 mg or 12.5 mg hydrochlorothiazide or placebo. The primary outcome will be incidence of stone recurrence (a composite of symptomatic or radiologic recurrence). Secondary outcomes will be individual components of the composite primary outcome, safety and tolerability of hydrochlorothiazide treatment, changes in urinary biochemistry elicited by hydrochlorothiazide treatment and impact of baseline disease severity, biochemical abnormalities and stone composition on treatment response. Discussion The NOSTONE study will provide long-sought information on the efficacy of hydrochlorothiazide in the recurrence prevention of calcium containing kidney stones. Strengths of the study include the randomized, double-blind and placebo-controlled design, the large amount of patients studied, the employment of high sensitivity and high specificity imaging and the exclusive public funding support. Trial registration ClinicalTrials.gov, NCT03057431. Registered on February 20 2017.
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Affiliation(s)
- Nasser A Dhayat
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Nicolas Faller
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Olivier Bonny
- Department of Nephrology, CHUV, University Hospital Lausanne, University of Lausanne, Lausanne, Switzerland
| | - Nilufar Mohebbi
- Department of Nephrology, University Hospital Zurich, Zürich, Switzerland
| | - Alexander Ritter
- Department of Nephrology, University Hospital Zurich, Zürich, Switzerland
| | - Lisa Pellegrini
- Department of Nephrology, Regional Hospital Lugano, Lugano, Switzerland
| | - Giulia Bedino
- Department of Nephrology, Regional Hospital Lugano, Lugano, Switzerland
| | - Carlo Schönholzer
- Department of Nephrology, Regional Hospital Lugano, Lugano, Switzerland
| | - Reto M Venzin
- Department of Nephrology, Cantonal Hospital Chur, Chur, Switzerland
| | - Carina Hüsler
- Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
| | - Irene Koneth
- Department of Nephrology and Transplantation Medicine, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
| | - Rosaria Del Giorno
- Department of Nephrology, Regional Hospital Bellinzona, Bellinzona, Switzerland
| | - Luca Gabutti
- Department of Nephrology, Regional Hospital Bellinzona, Bellinzona, Switzerland
| | - Patrizia Amico
- Medical Outpatient Department, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Michael Mayr
- Medical Outpatient Department, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Urs Odermatt
- Department of Nephrology, Cantonal Hospital Luzern, Luzern, Switzerland
| | - Florian Buchkremer
- Division of Nephrology, Dialysis and Transplantation, Cantonal Hospital Aarau, Aarau, Switzerland
| | - Thomas Ernandez
- Department of Nephrology, HUG, University Hospital Geneva, University of Geneva, Geneva, Switzerland
| | | | - Daniel Teta
- Service de Nephrology, Centre Hospitalier du Valais Romand (CHVR), Sion, Switzerland
| | - Felix Rintelen
- Clinical Trials Unit, University of Bern, Bern, Switzerland
| | - Marie Roumet
- Clinical Trials Unit, University of Bern, Bern, Switzerland
| | | | - Sven Trelle
- Clinical Trials Unit, University of Bern, Bern, Switzerland
| | - Luca Tamò
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.,Clinical Trials Unit, University of Bern, Bern, Switzerland
| | - Beat Roth
- Department of Urology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Bruno Vogt
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Daniel G Fuster
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
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24
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Braun DA, Lovric S, Schapiro D, Schneider R, Marquez J, Asif M, Hussain MS, Daga A, Widmeier E, Rao J, Ashraf S, Tan W, Lusk CP, Kolb A, Jobst-Schwan T, Schmidt JM, Hoogstraten CA, Eddy K, Kitzler TM, Shril S, Moawia A, Schrage K, Khayyat AIA, Lawson JA, Gee HY, Warejko JK, Hermle T, Majmundar AJ, Hugo H, Budde B, Motameny S, Altmüller J, Noegel AA, Fathy HM, Gale DP, Waseem SS, Khan A, Kerecuk L, Hashmi S, Mohebbi N, Ettenger R, Serdaroğlu E, Alhasan KA, Hashem M, Goncalves S, Ariceta G, Ubetagoyena M, Antonin W, Baig SM, Alkuraya FS, Shen Q, Xu H, Antignac C, Lifton RP, Mane S, Nürnberg P, Khokha MK, Hildebrandt F. Mutations in multiple components of the nuclear pore complex cause nephrotic syndrome. J Clin Invest 2018; 128:4313-4328. [PMID: 30179222 DOI: 10.1172/jci98688] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 07/24/2018] [Indexed: 01/08/2023] Open
Abstract
Steroid-resistant nephrotic syndrome (SRNS) almost invariably progresses to end-stage renal disease. Although more than 50 monogenic causes of SRNS have been described, a large proportion of SRNS remains unexplained. Recently, it was discovered that mutations of NUP93 and NUP205, encoding 2 proteins of the inner ring subunit of the nuclear pore complex (NPC), cause SRNS. Here, we describe mutations in genes encoding 4 components of the outer rings of the NPC, namely NUP107, NUP85, NUP133, and NUP160, in 13 families with SRNS. Using coimmunoprecipitation experiments, we showed that certain pathogenic alleles weakened the interaction between neighboring NPC subunits. We demonstrated that morpholino knockdown of nup107, nup85, or nup133 in Xenopus disrupted glomerulogenesis. Re-expression of WT mRNA, but not of mRNA reflecting mutations from SRNS patients, mitigated this phenotype. We furthermore found that CRISPR/Cas9 knockout of NUP107, NUP85, or NUP133 in podocytes activated Cdc42, an important effector of SRNS pathogenesis. CRISPR/Cas9 knockout of nup107 or nup85 in zebrafish caused developmental anomalies and early lethality. In contrast, an in-frame mutation of nup107 did not affect survival, thus mimicking the allelic effects seen in humans. In conclusion, we discovered here that mutations in 4 genes encoding components of the outer ring subunits of the NPC cause SRNS and thereby provide further evidence that specific hypomorphic mutations in these essential genes cause a distinct, organ-specific phenotype.
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Affiliation(s)
- Daniela A Braun
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.,Department of Internal Medicine D, University Hospital of Münster, Münster, Germany
| | - Svjetlana Lovric
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - David Schapiro
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Ronen Schneider
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Jonathan Marquez
- Pediatric Genomics Discovery Program, Department of Pediatrics and Genetics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Maria Asif
- Cologne Center for Genomics, University of Cologne, Cologne, Germany.,Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany.,Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Pakistan Institute of Engineering and Applied Sciences, Faisalabad, Pakistan
| | - Muhammad Sajid Hussain
- Cologne Center for Genomics, University of Cologne, Cologne, Germany.,Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany
| | - Ankana Daga
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Eugen Widmeier
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Jia Rao
- Department of Nephrology, Children's Hospital of Fudan University, Shanghai, China.,Shanghai Kidney Development and Pediatric Kidney Disease Research Center, Shanghai, China
| | - Shazia Ashraf
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Weizhen Tan
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - C Patrick Lusk
- Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Amy Kolb
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Tilman Jobst-Schwan
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Johanna Magdalena Schmidt
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Charlotte A Hoogstraten
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Kaitlyn Eddy
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Thomas M Kitzler
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Shirlee Shril
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Abubakar Moawia
- Cologne Center for Genomics, University of Cologne, Cologne, Germany.,Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany.,Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Pakistan Institute of Engineering and Applied Sciences, Faisalabad, Pakistan
| | - Kathrin Schrage
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany
| | - Arwa Ishaq A Khayyat
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany.,Biochemistry Department, King Saud University, Riyadh, Saudi Arabia
| | - Jennifer A Lawson
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Heon Yung Gee
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Jillian K Warejko
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Tobias Hermle
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Amar J Majmundar
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Hannah Hugo
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Birgit Budde
- Cologne Center for Genomics, University of Cologne, Cologne, Germany
| | - Susanne Motameny
- Cologne Center for Genomics, University of Cologne, Cologne, Germany
| | - Janine Altmüller
- Cologne Center for Genomics, University of Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany.,Institute of Human Genetics, University of Cologne, Cologne, Germany
| | - Angelika Anna Noegel
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Hanan M Fathy
- Pediatric Nephrology Unit, Alexandria Faculty of Medicine, University of Alexandria, Alexandria, Egypt
| | - Daniel P Gale
- Centre for Nephrology, University College London, Royal Free Hospital, London, United Kingdom
| | - Syeda Seema Waseem
- Cologne Center for Genomics, University of Cologne, Cologne, Germany.,Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany.,Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Pakistan Institute of Engineering and Applied Sciences, Faisalabad, Pakistan
| | - Ayaz Khan
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Pakistan Institute of Engineering and Applied Sciences, Faisalabad, Pakistan
| | - Larissa Kerecuk
- Birmingham Children's Hospital NHS Foundation Trust, Birmingham, United Kingdom
| | - Seema Hashmi
- Department of Pediatric Nephrology, Sindh Institute of Urology and Transplantation, Karachi, Pakistan
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Robert Ettenger
- Department of Pediatrics, University of California, Los Angeles, California
| | - Erkin Serdaroğlu
- Department of Pediatric Nephrology, Dr. Behçet Uz Children's Hospital, Izmir, Turkey
| | - Khalid A Alhasan
- Pediatric Department, College of Medicine, King Saud University and King Khalid University Hospital, Riyadh, Saudi Arabia
| | - Mais Hashem
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia.,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Sara Goncalves
- Laboratory of Hereditary Kidney Diseases, INSERM UMR1163, Imagine, Institute, Paris, France.,Université Paris Descartes-Sorbonne Paris Cité, Imagine, Institute, Paris, France
| | - Gema Ariceta
- Universitat Autonoma de Barcelona, Hospital Universitari Vall d'Hebron, Pediatric Nephrology, Barcelona, Spain
| | - Mercedes Ubetagoyena
- Hospital Universitario Donostia, Pediatric Nephrology, Donostia-San Sebastian, Spain
| | - Wolfram Antonin
- Institute of Biochemistry and Molecular Cell Biology, Medical School, RWTH Aachen University, 52074 Aachen, Germany
| | - Shahid Mahmood Baig
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Pakistan Institute of Engineering and Applied Sciences, Faisalabad, Pakistan
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia.,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Qian Shen
- Department of Nephrology, Children's Hospital of Fudan University, Shanghai, China.,Shanghai Kidney Development and Pediatric Kidney Disease Research Center, Shanghai, China
| | - Hong Xu
- Department of Nephrology, Children's Hospital of Fudan University, Shanghai, China.,Shanghai Kidney Development and Pediatric Kidney Disease Research Center, Shanghai, China
| | - Corinne Antignac
- Laboratory of Hereditary Kidney Diseases, INSERM UMR1163, Imagine, Institute, Paris, France.,Université Paris Descartes-Sorbonne Paris Cité, Imagine, Institute, Paris, France.,Department of Genetics, Necker Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Richard P Lifton
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut, USA.,Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, New York, USA
| | - Shrikant Mane
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Peter Nürnberg
- Cologne Center for Genomics, University of Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Mustafa K Khokha
- Pediatric Genomics Discovery Program, Department of Pediatrics and Genetics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Friedhelm Hildebrandt
- Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
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25
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Wiegand A, Ritter A, Graf N, Arampatzis S, Sidler D, Hadaya K, Müller TF, Wagner CA, Wüthrich RP, Mohebbi N. Preservation of kidney function in kidney transplant recipients by alkali therapy (Preserve-Transplant Study): rationale and study protocol. BMC Nephrol 2018; 19:177. [PMID: 30001705 PMCID: PMC6043955 DOI: 10.1186/s12882-018-0956-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 06/24/2018] [Indexed: 01/01/2023] Open
Abstract
Background Graft survival after kidney transplantation has significantly improved within the last decades but there is a substantial number of patients with declining transplant function and graft loss. Over the past years several studies have shown that metabolic acidosis plays an important role in the progression of Chronic Kidney Disease (CKD) and that alkalinizing therapies significantly delayed progression of CKD. Importantly, metabolic acidosis is highly prevalent in renal transplant patients and a recent retrospective study has shown that metabolic acidosis is associated with increased risk of graft loss and patient death in kidney transplant recipients. However, no prospective trial has been initiated yet to test the role of alkali treatment on renal allograft function. Methods The Preserve-Transplant Study is an investigator-initiated, prospective, patient-blinded, multi-center, randomized, controlled phase-IV trial with two parallel-groups comparing sodium bicarbonate to placebo. The primary objective is to test if alkali treatment will preserve kidney graft function and diminish the progression of CKD in renal transplant patients by assesing the change in eGFR over 2 years from baseline. Additionally we want to investigate the underlying pathomechanisms of nephrotoxicity of metabolic acidosis. Discussion This study has the potential to provide evidence that alkali treatment may slow or reduce the progression towards graft failure and significantly decrease the rate of end stage renal disease (ESRD), thus prolonging long-term graft survival. The implementation of alkali therapy into the drug regimen of kidney transplant recipients would have a favorable risk-benefit ratio since alkali supplements are routinely used in CKD patients and represent a well-tolerated, safe and cost-effective treatment. Trial registration ClinicalTrials.gov NCT03102996. Trial registration was completed on April 6, 2017.
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Affiliation(s)
- Anna Wiegand
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Alexander Ritter
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Nicole Graf
- Graf Biostatistics, Wintherthur, Switzerland
| | - Spyridon Arampatzis
- Department of Nephrology and Hypertension, University Hospital Berne, Berne, Switzerland
| | - Daniel Sidler
- Department of Nephrology and Hypertension, University Hospital Berne, Berne, Switzerland
| | - Karine Hadaya
- Division of Nephrology, University Hospital Geneva, Geneva, Switzerland
| | - Thomas F Müller
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Rudolf P Wüthrich
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland.
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26
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Fankhauser CD, Mohebbi N, Grogg J, Holenstein A, Zhong Q, Hermanns T, Sulser T, Steurer J, Cédric P. Prevalence of hypertension and diabetes after exposure to extracorporeal shock-wave lithotripsy in patients with renal calculi: a retrospective non-randomized data analysis. Int Urol Nephrol 2018; 50:1227-1233. [PMID: 29785660 PMCID: PMC6013534 DOI: 10.1007/s11255-018-1857-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 03/26/2018] [Indexed: 12/23/2022]
Abstract
PURPOSE To evaluate the association of shock-wave lithotripsy (SWL) for kidney stones and hypertension or diabetes. METHODS Patients with urolithiasis treated by SWL were retrospectively identified. To assess whether shock-wave application to the kidney is associated with long-term adverse effects, patients after SWL for kidney stones were selected as the main group of interest. Patients treated with shock waves for distal ureter stones only were chosen as a comparison group. A questionnaire was sent to all patients to assess the prevalence of hypertension and diabetes. The Swiss Health Survey (SHS) dataset was used as an additional comparison group. RESULTS After a median follow-up of 13.7 years, the odds ratio (OR) to report hypertension [OR 1.30 (95% CI 1.10-1.95)] or diabetes [OR 1.54 (95% CI 1.21-1.97)] was significantly higher in patients treated with SWL compared to the SHS dataset. In comparison with the kidney group, participants in the SHS had a significantly lower OR to report hypertension at follow-up [OR 0.79 (95% CI 0.65-0.95)], while the OR to report hypertension [1.16 (95% CI 0.79-1.70)] was not significantly different in the distal ureter group. For diabetes, a significantly lower [OR 0.60 (95% CI 0.46-0.78)] in the SHS group and a non-significantly lower [OR 0.68 (95% CI 0.38-1.22)] in the ureter group was noted compared to the kidney group. CONCLUSION Compared to the SHS data set SWL was in general associated with hypertension and diabetes. However, no clear difference between patients after SWL to the kidney compared to SWL to the distal ureter was seen and thus the data do not support a causal relationship.
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Affiliation(s)
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Josias Grogg
- Department of Urology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Alexander Holenstein
- Department of Urology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Qing Zhong
- Department of Pathology of Molecular Pathology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
- Cancer Data Science Group, Children's Medical Research Institute, University of Sydney, Sydney, NSW, Australia
| | - Thomas Hermanns
- Department of Urology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Tullio Sulser
- Department of Urology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Johann Steurer
- Horten Centre for Patient Oriented Research and Knowledge Transfer, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Poyet Cédric
- Department of Urology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
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27
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Abstract
The Multimorbid Patient: Use of New Oral Anticoagulants in Patients with Chronic Kidney Disease Abstract. Increasing life expectancy in Western countries is associated with a high prevalence of multiple chronic diseases which is defined by the term "multimorbidity". Many of these patients suffer from chronic kidney disease (CKD) and thrombogenic comorbidities such as atrial fibrillation with the need for oral anticoagulation. For decades vitamin K antagonists have been exclusively prescribed for oral anticoagulation. However, due to altered pharmacokinetics and bioavailability of these drugs in CKD, a significant risk of bleeding exists. The introduction of direct oral anticoagulants as a new and promising alternative to vitamin K antagonists was -especially for CKD patients - highly anticipated. However, data from randomized studies are missing for older patients with advanced CKD. Consequently, a careful evaluation of the risk-benefit ratio is recommended for this sensitive patient population.
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Affiliation(s)
- Nilufar Mohebbi
- 1 Klinik für Nephrologie, Universitätsspital Zürich und Praxis und Dialysezentrum Zürich-City
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28
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Wiegand A, Graf N, Bonani M, Frey D, Wüthrich R, Mohebbi N. SP726RELATIONSHIP OF SERUM BICARBONATE LEVELS WITH 1-YEAR GRAFT FUNCTION IN KIDNEY TRANSPLANT RECIPIENTS. Nephrol Dial Transplant 2018. [DOI: 10.1093/ndt/gfy104.sp726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Anna Wiegand
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Nicole Graf
- Graf Biostatistics, Graf Biostatistics, Winterthur, Switzerland
| | - Marco Bonani
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Diana Frey
- Division of Rheumatology, University Hospital Zurich, Zurich, Switzerland
| | - Rudolf Wüthrich
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
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29
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Spartà G, Gaspert A, Neuhaus TJ, Weitz M, Mohebbi N, Odermatt U, Zipfel PF, Bergmann C, Laube GF. Membranoproliferative glomerulonephritis and C3 glomerulopathy in children: change in treatment modality? A report of a case series. Clin Kidney J 2018; 11:479-490. [PMID: 30094012 PMCID: PMC6070093 DOI: 10.1093/ckj/sfy006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 12/27/2017] [Indexed: 12/11/2022] Open
Abstract
Background Membranoproliferative glomerulonephritis (MPGN) with immune complexes and C3 glomerulopathy (C3G) in children are rare and have a variable outcome, with some patients progressing to end-stage renal disease (ESRD). Mutations in genes encoding regulatory proteins of the alternative complement pathway and of complement C3 (C3) have been identified as concausative factors. Methods Three children with MPGN type I, four with C3G, i.e. three with C3 glomerulonephritis (C3GN) and one with dense deposit disease (DDD), were followed. Clinical, autoimmune data, histological characteristics, estimated glomerular filtration rate (eGFR), proteinuria, serum C3, genetic and biochemical analysis were assessed. Results The median age at onset was 7.3 years and the median eGFR was 72 mL/min/1.73 m2. Six children had marked proteinuria. All were treated with renin-angiotensin-aldosterone system (RAAS) blockers. Three were given one or more immunosuppressive drugs and two eculizumab. At the last median follow-up of 9 years after diagnosis, three children had normal eGFR and no or mild proteinuria on RAAS blockers only. Among four patients without remission of proteinuria, genetic analysis revealed mutations in complement regulator proteins of the alternative pathway. None of the three patients with immunosuppressive treatment achieved partial or complete remission of proteinuria and two progressed to ESRD and renal transplantation. Two patients treated with eculizumab revealed relevant decreases in proteinuria. Conclusions In children with MPGN type I and C3G, the outcomes of renal function and response to treatment modality show great variability independent from histological diagnosis at disease onset. In case of severe clinical presentation at disease onset, early genetic and biochemical analysis of the alternative pathway dysregulation is recommended. Treatment with eculizumab appears to be an option to slow disease progression in single cases.
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Affiliation(s)
- Giuseppina Spartà
- Pediatric Nephrology Unit, University Children's Hospital Zurich, Zurich, Switzerland
| | - Ariana Gaspert
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Thomas J Neuhaus
- Children's Hospital of Lucerne, Cantonal Hospital Lucerne, Lucerne, Switzerland
| | - Marcus Weitz
- Pediatric Nephrology Unit, University Children's Hospital Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Urs Odermatt
- Nephrology Unit, Cantonal Hospital Lucerne, Lucerne, Switzerland
| | - Peter F Zipfel
- Leibniz Institute for Natural Product Research and Infection Biology e. V. Hans-Knöll-Institute, Jena, Germany.,Friedrich Schiller University, Jena, Germany
| | - Carsten Bergmann
- Bioscientia Center of Human Genetics, Ingelheim am Rhein, Germany
| | - Guido F Laube
- Pediatric Nephrology Unit, University Children's Hospital Zurich, Zurich, Switzerland
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30
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Affiliation(s)
- Harald Seeger
- Division of Nephrology, University Hospital Zürich, Zürich, Switzerland.
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zürich, Zürich, Switzerland
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31
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Pathare G, Dhayat NA, Mohebbi N, Wagner CA, Bobulescu IA, Moe OW, Fuster DG. Changes in V-ATPase subunits of human urinary exosomes reflect the renal response to acute acid/alkali loading and the defects in distal renal tubular acidosis. Kidney Int 2018; 93:871-880. [PMID: 29310826 DOI: 10.1016/j.kint.2017.10.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 10/02/2017] [Accepted: 10/05/2017] [Indexed: 12/26/2022]
Abstract
In the kidney, final urinary acidification is achieved by V-ATPases expressed in type A intercalated cells. The B1 subunit of the V-ATPase is required for maximal urinary acidification, while the role of the homologous B2 subunit is less clear. Here we examined the effect of acute acid/alkali loading in humans on B1 and B2 subunit abundance in urinary exosomes in normal individuals and of acid loading in patients with distal renal tubular acidosis (dRTA). Specificities of B1 and B2 subunit antibodies were verified by yeast heterologously expressing human B1 and B2 subunits, and murine wild-type and B1-deleted kidney lysates. Acute ammonium chloride loading elicited systemic acidemia, a drop in urinary pH, and increased urinary ammonium excretion. Nadir urinary pH was achieved at four to five hours, and exosomal B1 abundance was significantly increased at two through six hours after ammonium chloride loading. After acute equimolar sodium bicarbonate loading, blood and urinary pH rose rapidly, with a concomitant reduction of exosomal B1 abundance within two hours, which remained lower throughout the test. In contrast, no change in exosomal B2 abundance was found following acid or alkali loading. In patients with inherited or acquired distal RTA, the urinary B1 subunit was extremely low or undetectable and did not respond to acid loading in urine, whereas no change in B2 subunit was found. Thus, both B1 and B2 subunits of the V-ATPase are detectable in human urinary exosomes, and acid and alkali loading or distal RTA cause changes in the B1 but not B2 subunit abundance in urinary exosomes.
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Affiliation(s)
- Ganesh Pathare
- Division of Nephrology and Hypertension, Bern University Hospital, University of Bern, Bern, Switzerland; Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland; National Centre of Competence in Research Transcure, University of Bern, Bern, Switzerland
| | - Nasser A Dhayat
- Division of Nephrology and Hypertension, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland; National Center for Competence in Research Kidney.CH, Zurich, Switzerland
| | - Ion A Bobulescu
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA; Charles and Jane Pak Center of Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Orson W Moe
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA; Charles and Jane Pak Center of Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, Texas, USA; Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Daniel G Fuster
- Division of Nephrology and Hypertension, Bern University Hospital, University of Bern, Bern, Switzerland; Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland; National Centre of Competence in Research Transcure, University of Bern, Bern, Switzerland.
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Seeger H, Kaelin A, Ferraro PM, Weber D, Jaeger P, Ambuehl P, Robertson WG, Unwin R, Wagner CA, Mohebbi N. Changes in urinary risk profile after short-term low sodium and low calcium diet in recurrent Swiss kidney stone formers. BMC Nephrol 2017; 18:349. [PMID: 29202723 PMCID: PMC5715611 DOI: 10.1186/s12882-017-0755-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 11/14/2017] [Indexed: 11/10/2022] Open
Abstract
Background Kidney stone disease is common in industrialized countries. Recently, it has attracted growing attention, because of its significant association with adverse renal outcomes, including end stage renal disease. Calcium-containing kidney stones are frequent with high recurrence rates. While hypercalciuria is a well-known risk factor, restricted intake of animal protein and sodium, combined with normal dietary calcium, has been shown to be more effective in stone prevention compared with a low-calcium diet. Notably, the average sodium intake in Switzerland is twice as high as the WHO recommendation, while the intake of milk and dairy products is low. Methods We retrospectively analyzed Swiss recurrent kidney stone formers (rKSF) to test the impact of a low-sodium in combination with a low-calcium diet on the urinary risk profile. In patients with recurrent calcium oxalate containing stones, we investigated both, the consequence of a low-sodium diet on urinary volume and calcium excretion, and the influence of a low-sodium low-calcium diet on urinary oxalate excretion. Results Of the 169 patients with CaOx stones, 49 presented with hypercalciuria at baseline. The diet resulted in a highly significant reduction in 24-h urinary sodium and calcium excretion: from 201 ± 89 at baseline to 128 ± 88 mmol/d for sodium (p < 0.0001), and from 5.67 ± 3.01 to 4.06 ± 2.46 mmol/d (p < 0.0001) for calcium, respectively. Urine volume remained unchanged. Notably, no increase in oxalate excretion occurred on the restricted diet (0.39 ± 0.26 vs 0.39 ± 0.19 mmol/d, p = 0.277). Calculated Psf (probability of stone formation) values were only predictive for the risk of calcium phosphate stones. Conclusion A diet low in sodium and calcium in recurrent calcium oxalate stone formers resulted in a significant reduction of urinary calcium excretion, but no change in urine volume. In this population with apparently low intake of dairy products, calcium restriction does not necessarily result in increased urinary oxalate excretion. However, based on previous studies, we recommend a normal dietary calcium intake to avoid a potential increase in urinary oxalate excretion and unfavorable effects on bone metabolism in hypercalciuric KSFs. Electronic supplementary material The online version of this article (10.1186/s12882-017-0755-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Harald Seeger
- Division of Nephrology, University Hospital Zurich, Rämistr. 100, 8091, Zurich, Switzerland
| | - Andrea Kaelin
- Division of Nephrology, University Hospital Zurich, Rämistr. 100, 8091, Zurich, Switzerland
| | - Pietro M Ferraro
- Division of Nephrology, Fondazione Policlinico Universitario A. Gemelli, Catholic University of the Sacred Heart, Rome, Italy
| | - Damian Weber
- Department of Urology, University Hospital Zurich, Zurich, Switzerland
| | - Philippe Jaeger
- Centre for Nephrology, University College London, London, UK
| | - Patrice Ambuehl
- Division of Nephrology, Stadtspital Waid, Zurich, Switzerland
| | | | - Robert Unwin
- Centre for Nephrology, University College London, London, UK
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland.,, National Center for Competence in Research NCCR Kidney, CH, Zurich, Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Rämistr. 100, 8091, Zurich, Switzerland.
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Mohebbi N, Ferraro PM, Gambaro G, Unwin R. Tubular and genetic disorders associated with kidney stones. Urolithiasis 2016; 45:127-137. [DOI: 10.1007/s00240-016-0945-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 11/22/2016] [Indexed: 02/08/2023]
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Daryadel A, Bourgeois S, Figueiredo MFL, Gomes Moreira A, Kampik NB, Oberli L, Mohebbi N, Lu X, Meima ME, Danser AHJ, Wagner CA. Colocalization of the (Pro)renin Receptor/Atp6ap2 with H+-ATPases in Mouse Kidney but Prorenin Does Not Acutely Regulate Intercalated Cell H+-ATPase Activity. PLoS One 2016; 11:e0147831. [PMID: 26824839 PMCID: PMC4732657 DOI: 10.1371/journal.pone.0147831] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 01/08/2016] [Indexed: 12/11/2022] Open
Abstract
The (Pro)renin receptor (P)RR/Atp6ap2 is a cell surface protein capable of binding and non-proteolytically activate prorenin. Additionally, (P)RR is associated with H+-ATPases and alternative functions in H+-ATPase regulation as well as in Wnt signalling have been reported. Kidneys express very high levels of H+-ATPases which are involved in multiple functions such as endocytosis, membrane protein recycling as well as urinary acidification, bicarbonate reabsorption, and salt absorption. Here, we wanted to localize the (P)RR/Atp6ap2 along the murine nephron, exmaine whether the (P)RR/Atp6ap2 is coregulated with other H+-ATPase subunits, and whether acute stimulation of the (P)RR/Atp6ap2 with prorenin regulates H+-ATPase activity in intercalated cells in freshly isolated collecting ducts. We localized (P)PR/Atp6ap2 along the murine nephron by qPCR and immunohistochemistry. (P)RR/Atp6ap2 mRNA was detected in all nephron segments with highest levels in the collecting system coinciding with H+-ATPases. Further experiments demonstrated expression at the brush border membrane of proximal tubules and in all types of intercalated cells colocalizing with H+-ATPases. In mice treated with NH4Cl, NaHCO3, KHCO3, NaCl, or the mineralocorticoid DOCA for 7 days, (P)RR/Atp6ap2 and H+-ATPase subunits were regulated but not co-regulated at protein and mRNA levels. Immunolocalization in kidneys from control, NH4Cl or NaHCO3 treated mice demonstrated always colocalization of PRR/Atp6ap2 with H+-ATPase subunits at the brush border membrane of proximal tubules, the apical pole of type A intercalated cells, and at basolateral and/or apical membranes of non-type A intercalated cells. Microperfusion of isolated cortical collecting ducts and luminal application of prorenin did not acutely stimulate H+-ATPase activity. However, incubation of isolated collecting ducts with prorenin non-significantly increased ERK1/2 phosphorylation. Our results suggest that the PRR/Atp6ap2 may form a complex with H+-ATPases in proximal tubule and intercalated cells but that prorenin has no acute effect on H+-ATPase activity in intercalated cells.
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MESH Headings
- Ammonium Chloride/pharmacology
- Animals
- Anion Transport Proteins/genetics
- Anion Transport Proteins/metabolism
- Aquaporin 2/genetics
- Aquaporin 2/metabolism
- Cell Membrane/drug effects
- Cell Membrane/metabolism
- Dogs
- Gene Expression Regulation
- Kidney Cortex/cytology
- Kidney Cortex/drug effects
- Kidney Cortex/metabolism
- Kidney Medulla/cytology
- Kidney Medulla/drug effects
- Kidney Medulla/metabolism
- Kidney Tubules, Collecting/cytology
- Kidney Tubules, Collecting/drug effects
- Kidney Tubules, Collecting/metabolism
- Kidney Tubules, Proximal/cytology
- Kidney Tubules, Proximal/drug effects
- Kidney Tubules, Proximal/metabolism
- Madin Darby Canine Kidney Cells
- Male
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/metabolism
- Mice
- Mice, Inbred C57BL
- Proton-Translocating ATPases/genetics
- Proton-Translocating ATPases/metabolism
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Renin/pharmacology
- Renin-Angiotensin System/drug effects
- Signal Transduction
- Sodium Bicarbonate/pharmacology
- Sodium Chloride/pharmacology
- Sodium-Phosphate Cotransporter Proteins, Type IIa/genetics
- Sodium-Phosphate Cotransporter Proteins, Type IIa/metabolism
- Solute Carrier Family 12, Member 1/genetics
- Solute Carrier Family 12, Member 1/metabolism
- Solute Carrier Family 12, Member 3/genetics
- Solute Carrier Family 12, Member 3/metabolism
- Sulfate Transporters
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Affiliation(s)
- Arezoo Daryadel
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Soline Bourgeois
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | | | | | - Nicole B. Kampik
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Lisa Oberli
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Institute of Physiology, University of Zurich, Zurich, Switzerland
- Divison of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Xifeng Lu
- Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Marcel E. Meima
- Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - A. H. Jan Danser
- Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Carsten A. Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland
- * E-mail:
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Wagner CA, Mohebbi N, Bourgeois S. The ugly duckling of urinary acidification: what is the contribution of the thick ascending limb of the loop of Henle to urinary acidification? Am J Physiol Renal Physiol 2015; 309:F431-3. [PMID: 26155846 DOI: 10.1152/ajprenal.00296.2015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 07/07/2015] [Indexed: 11/22/2022] Open
Affiliation(s)
- Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland; and
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Soline Bourgeois
- Institute of Physiology, University of Zurich, Zurich, Switzerland; and
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Kumar NN, Velic A, Soliz J, Shi Y, Li K, Wang S, Weaver JL, Sen J, Abbott SBG, Lazarenko RM, Ludwig MG, Perez-Reyes E, Mohebbi N, Bettoni C, Gassmann M, Suply T, Seuwen K, Guyenet PG, Wagner CA, Bayliss DA. PHYSIOLOGY. Regulation of breathing by CO₂ requires the proton-activated receptor GPR4 in retrotrapezoid nucleus neurons. Science 2015; 348:1255-60. [PMID: 26068853 DOI: 10.1126/science.aaa0922] [Citation(s) in RCA: 169] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 05/06/2015] [Indexed: 12/12/2022]
Abstract
Blood gas and tissue pH regulation depend on the ability of the brain to sense CO2 and/or H(+) and alter breathing appropriately, a homeostatic process called central respiratory chemosensitivity. We show that selective expression of the proton-activated receptor GPR4 in chemosensory neurons of the mouse retrotrapezoid nucleus (RTN) is required for CO2-stimulated breathing. Genetic deletion of GPR4 disrupted acidosis-dependent activation of RTN neurons, increased apnea frequency, and blunted ventilatory responses to CO2. Reintroduction of GPR4 into RTN neurons restored CO2-dependent RTN neuronal activation and rescued the ventilatory phenotype. Additional elimination of TASK-2 (K(2P)5), a pH-sensitive K(+) channel expressed in RTN neurons, essentially abolished the ventilatory response to CO2. The data identify GPR4 and TASK-2 as distinct, parallel, and essential central mediators of respiratory chemosensitivity.
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Affiliation(s)
- Natasha N Kumar
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | - Ana Velic
- Institute of Physiology, University of Zurich, Zurich, CH-8057, Switzerland
| | - Jorge Soliz
- Institute of Veterinary Physiology, University of Zurich, Zurich, CH-8057, Switzerland. Centre de Recherche du CHU de Québec, Département de Pédiatrie, Faculté de Médecine, Université Laval, Québec, QC, Canada
| | - Yingtang Shi
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | - Keyong Li
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | - Sheng Wang
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA. Department of Physiology, Hebei Medical University, Shijiazhuang, Hebei, 050017, China
| | - Janelle L Weaver
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | - Josh Sen
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | - Stephen B G Abbott
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA. School of Medical Sciences, University of New South Wales, New South Wales 2052, Australia. Department of Neurology, Harvard Medical School and Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Roman M Lazarenko
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | | | - Edward Perez-Reyes
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | - Nilufar Mohebbi
- Institute of Physiology, University of Zurich, Zurich, CH-8057, Switzerland
| | - Carla Bettoni
- Institute of Physiology, University of Zurich, Zurich, CH-8057, Switzerland
| | - Max Gassmann
- Institute of Veterinary Physiology, University of Zurich, Zurich, CH-8057, Switzerland
| | - Thomas Suply
- Novartis Institutes for Biomedical Research, Basel, CH-4002, Switzerland
| | - Klaus Seuwen
- Novartis Institutes for Biomedical Research, Basel, CH-4002, Switzerland
| | - Patrice G Guyenet
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, CH-8057, Switzerland.
| | - Douglas A Bayliss
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, USA.
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van den Wildenberg MJ, Hoorn EJ, Mohebbi N, Wagner CA, Woittiez AJ, de Vries PAM, Laverman GD. Distal renal tubular acidosis with multiorgan autoimmunity: a case report. Am J Kidney Dis 2014; 65:607-10. [PMID: 25533600 DOI: 10.1053/j.ajkd.2014.09.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 09/11/2014] [Indexed: 11/11/2022]
Abstract
A 61-year-old woman with a history of pernicious anemia presented with progressive muscle weakness and dysarthria. Hypokalemic paralysis (serum potassium, 1.4 mEq/L) due to distal renal tubular acidosis (dRTA) was diagnosed. After excluding several possible causes, dRTA was considered autoimmune. However, the patient did not meet criteria for any of the autoimmune disorders classically associated with dRTA. She had very high antibody titers against parietal cells, intrinsic factor, and thyroid peroxidase (despite normal thyroid function). The patient consented to a kidney biopsy, and acid-base transporters, anion exchanger type 1 (AE1), and pendrin were undetectable by immunofluorescence. Indirect immunofluorescence detected diminished abundance of AE1- and pendrin-expressing intercalated cells in the kidney, as well as staining by the patient's serum of normal human intercalated cells and parietal cells expressing the adenosine triphosphatase hydrogen/potassium pump (H(+)/K(+)-ATPase) in normal human gastric mucosa. The dRTA likely is caused by circulating autoantibodies against intercalated cells, with possible cross-reactivity against structures containing gastric H(+)/K(+)-ATPase. This case demonstrates that in patients with dRTA without a classic autoimmune disorder, autoimmunity may still be the underlying cause. The mechanisms involved in autoantibody development and how dRTA can be caused by highly specific autoantibodies against intercalated cells have yet to be determined.
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Affiliation(s)
| | - Ewout J Hoorn
- Department of Internal Medicine, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Nilufar Mohebbi
- Division of Nephrology, University Hospital Zurich, Zürich, Switzerland; Institute of Physiology and Zürich Center for Human Intergrative Physiology, University of Zürich, Zürich, Switzerland
| | - Carsten A Wagner
- Institute of Physiology and Zürich Center for Human Intergrative Physiology, University of Zürich, Zürich, Switzerland
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Bürki R, Mohebbi N, Bettoni C, Wang X, Serra AL, Wagner CA. Impaired expression of key molecules of ammoniagenesis underlies renal acidosis in a rat model of chronic kidney disease. Nephrol Dial Transplant 2014; 30:770-81. [PMID: 25523450 DOI: 10.1093/ndt/gfu384] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 11/19/2014] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Advanced chronic kidney disease (CKD) is associated with the development of renal metabolic acidosis. Metabolic acidosis per se may represent a trigger for progression of CKD. Renal acidosis of CKD is characterized by low urinary ammonium excretion with preserved urinary acidification indicating a defect in renal ammoniagenesis, ammonia excretion or both. The underlying molecular mechanisms, however, have not been addressed to date. METHODS We examined the Han:SPRD rat model and used a combination of metabolic studies, mRNA and protein analysis of renal molecules involved in acid-base handling. RESULTS We demonstrate that rats with reduced kidney function as evident from lower creatinine clearance, lower haematocrit, higher plasma blood urea nitrogen, creatinine, phosphate and potassium had metabolic acidosis that could be aggravated by HCl acid loading. Urinary ammonium excretion was highly reduced whereas urinary pH was more acidic in CKD compared with control animals. The abundance of key enzymes and transporters of proximal tubular ammoniagenesis (phosphate-dependent glutaminase, PEPCK and SNAT3) and bicarbonate transport (NBCe1) was reduced in CKD compared with control animals. In the collecting duct, normal expression of the B1 H(+)-ATPase subunit is in agreement with low urinary pH. In contrast, the RhCG ammonia transporter, critical for the final secretion of ammonia into urine was strongly down-regulated in CKD animals. CONCLUSION In the Han:SPRD rat model for CKD, key molecules required for renal ammoniagenesis and ammonia excretion are highly down-regulated providing a possible molecular explanation for the development and maintenance of renal acidosis in CKD patients.
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Affiliation(s)
- Remy Bürki
- Institute of Physiology and ZIHP, University of Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Institute of Physiology and ZIHP, University of Zurich, Zurich, Switzerland Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Carla Bettoni
- Institute of Physiology and ZIHP, University of Zurich, Zurich, Switzerland
| | - Xueqi Wang
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland Department of Nephrology, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Andreas L Serra
- Division of Nephrology, University Hospital Zurich, Zurich, Switzerland
| | - Carsten A Wagner
- Institute of Physiology and ZIHP, University of Zurich, Zurich, Switzerland
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Mihout F, Devuyst O, Bensman A, Brocheriou I, Ridel C, Wagner CA, Mohebbi N, Boffa JJ, Plaisier E, Ronco P. Acute metabolic acidosis in a GLUT2-deficient patient with Fanconi-Bickel syndrome: new pathophysiology insights. Nephrol Dial Transplant 2014; 29 Suppl 4:iv113-6. [PMID: 25165176 DOI: 10.1093/ndt/gfu018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Fanconi-Bickel syndrome is a rare autosomal-recessive disorder caused by mutations in the SLC2A2 gene coding for the glucose transporter protein 2 (GLUT2). Major manifestations include hepatomegaly, glucose intolerance, post-prandial hypoglycaemia and renal disease that usually presents as proximal tubular acidosis associated with proximal tubule dysfunction (renal Fanconi syndrome). We report a patient harbouring a homozygous mutation of SLC2A2 who presented a dramatic exacerbation of metabolic acidosis in the context of a viral infection, owing to both ketosis and major urinary bicarbonate loss. The kidney biopsy revealed nuclear and cytoplasmic accumulation of glycogen in proximal tubule cells, a lack of expression of GLUT2, and major defects of key proteins of the proximal tubule such as megalin, cubilin and the B2 subunit of H(+)-ATPase. These profound alterations of the transport systems most likely contributed to proximal tubule alterations and profound bicarbonate loss.
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Affiliation(s)
- Fabrice Mihout
- Department of Nephrology and Dialysis, AP-HP, Tenon Hospital, Paris, France
| | - Olivier Devuyst
- Institute of Physiology, University of Zürich, Zürich, Switzerland
| | - Albert Bensman
- Department of Pediatric Nephrology, AP-HP, Robert Debré Hospital, Paris, France
| | - Isabelle Brocheriou
- Department of Pathology, AP-HP, Tenon Hospital, Paris, France Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1155, Paris, France
| | - Christophe Ridel
- Department of Renal Emergency and Kidney Transplantation, AP-HP, Tenon Hospital, Paris, France
| | - Carsten A Wagner
- Institute of Physiology, University of Zürich, Zürich, Switzerland
| | - Nilufar Mohebbi
- Institute of Physiology, University of Zürich, Zürich, Switzerland
| | - Jean-Jacques Boffa
- Department of Nephrology and Dialysis, AP-HP, Tenon Hospital, Paris, France Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1155, Paris, France INSERM, UMR_S 1155, Paris, France
| | - Emmanuelle Plaisier
- Department of Nephrology and Dialysis, AP-HP, Tenon Hospital, Paris, France Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1155, Paris, France INSERM, UMR_S 1155, Paris, France
| | - Pierre Ronco
- Department of Nephrology and Dialysis, AP-HP, Tenon Hospital, Paris, France Sorbonne Universités, UPMC Univ Paris 06, UMR_S 1155, Paris, France INSERM, UMR_S 1155, Paris, France
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Giudici L, Velic A, Daryadel A, Bettoni C, Mohebbi N, Suply T, Seuwen K, Ludwig MG, Wagner CA. The proton-activated receptor GPR4 modulates glucose homeostasis by increasing insulin sensitivity. Cell Physiol Biochem 2014; 32:1403-16. [PMID: 24296356 DOI: 10.1159/000356578] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/21/2013] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The proton-activated G protein-coupled receptor GPR4 is expressed in many tissues including white adipose tissue. GPR4 is activated by extracellular protons in the physiological pH range (i.e. pH 7.7 - 6.8) and is coupled to the production of cAMP. METHODS We examined mice lacking GPR4 and examined glucose tolerance and insulin sensitivity in young and aged mice as well as in mice fed with a high fat diet. Expression profiles of pro- and anti-inflammatory cytokines in white adipose tissue, liver and skeletal muscle was assessed. RESULTS Here we show that mice lacking GPR4 have an improved intraperitoneal glucose tolerance test and increased insulin sensitivity. Insulin levels were comparable but leptin levels were increased in GPR4 KO mice. Gpr4-/- showed altered expression of PPARa, IL-6, IL-10, TNFa, and TGF-1b in skeletal muscle, white adipose tissue, and liver. High fat diet abolished the differences in glucose tolerance and insulin sensitivity between Gpr4+/+ and Gpr4-/- mice. In contrast, in aged mice (12 months old), the positive effect of GPR4 deficiency on glucose tolerance and insulin sensitivity was maintained. Liver and adipose tissue showed no major differences in the mRNA expression of pro- and anti-inflammatory factors between aged mice of both genotypes. CONCLUSION Thus, GPR4 deficiency improves glucose tolerance and insulin sensitivity. The effect may involve an altered balance between pro- and anti-inflammatory factors in insulin target tissues.
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Bonani M, Rodriguez D, Fehr T, Mohebbi N, Brockmann J, Blum M, Graf N, Frey D, Wüthrich RP. Sclerostin Blood Levels Before and After Kidney Transplantation. Kidney Blood Press Res 2014; 39:230-9. [DOI: 10.1159/000355781] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/27/2014] [Indexed: 11/19/2022] Open
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Giacopo AD, Rubio-Aliaga I, Cantone A, Artunc F, Rexhepaj R, Frey-Wagner I, Font-Llitjós M, Gehring N, Stange G, Jaenecke I, Mohebbi N, Closs EI, Palacín M, Nunes V, Daniel H, Lang F, Capasso G, Wagner CA. Differential cystine and dibasic amino acid handling after loss of function of the amino acid transporter b0,+AT (Slc7a9) in mice. Am J Physiol Renal Physiol 2013; 305:F1645-55. [DOI: 10.1152/ajprenal.00221.2013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Cystinuria is an autosomal recessive disease caused by mutations in SLC3A1 ( rBAT) and SLC7A9 ( b 0,+ AT). Gene targeting of the catalytic subunit ( Slc7a9) in mice leads to excessive excretion of cystine, lysine, arginine, and ornithine. Here, we studied this non-type I cystinuria mouse model using gene expression analysis, Western blotting, clearance, and brush-border membrane vesicle (BBMV) uptake experiments to further characterize the renal and intestinal consequences of losing Slc7a9 function. The electrogenic and BBMV flux studies in the intestine suggested that arginine and ornithine are transported via other routes apart from system b0,+. No remarkable gene expression changes were observed in other amino acid transporters and the peptide transporters in the intestine and kidney. Furthermore, the glomerular filtration rate (GFR) was reduced by 30% in knockout animals compared with wild-type animals. The fractional excretion of arginine was increased as expected (∼100%), but fractional excretions of lysine (∼35%), ornithine (∼16%), and cystine (∼11%) were less affected. Loss of function of b0,+AT reduced transport of cystine and arginine in renal BBMVs and completely abolished the exchanger activity of dibasic amino acids with neutral amino acids. In conclusion, loss of Slc7a9 function decreases the GFR and increases the excretion of several amino acids to a lesser extent than expected with no clear regulation at the mRNA and protein level of alternative transporters and no increased renal epithelial uptake. These observations indicate that transporters located in distal segments of the kidney and/or metabolic pathways may partially compensate for Slc7a9 loss of function.
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Affiliation(s)
- Andrea Di Giacopo
- Institute of Physiology-Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
| | - Isabel Rubio-Aliaga
- Institute of Physiology-Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
| | - Alessandra Cantone
- Department of Internal Medicine, Chair of Nephrology, Second University of Naples, Naples, Italy
| | - Ferruh Artunc
- Department of Physiology, University of Tübingen, Tübingen, Germany
| | - Rexhep Rexhepaj
- Department of Physiology, University of Tübingen, Tübingen, Germany
| | | | - Mariona Font-Llitjós
- Medical and Molecular Genetics Center, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Spain
- U730 CIBERER, Barcelona, Spain
| | - Nicole Gehring
- Institute of Physiology-Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
| | - Gerti Stange
- Institute of Physiology-Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
| | - Isabel Jaenecke
- Department of Pharmacology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Nilufar Mohebbi
- Institute of Physiology-Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
| | - Ellen I. Closs
- Department of Pharmacology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Manuel Palacín
- IRB Barcelona, Department of Biochemistry and Molecular Biology, University of Barcelona and U731 CIBERER, Barcelona, Spain
| | - Virginia Nunes
- Medical and Molecular Genetics Center, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Spain
- Department of Physiological Sciences II, University of Barcelona, Spain; and
- U730 CIBERER, Barcelona, Spain
| | - Hannelore Daniel
- Molecular Nutrition Unit, Technical University of Munich, Freising, Germany
| | - Florian Lang
- Department of Physiology, University of Tübingen, Tübingen, Germany
| | - Giovambattista Capasso
- Department of Internal Medicine, Chair of Nephrology, Second University of Naples, Naples, Italy
| | - Carsten A. Wagner
- Institute of Physiology-Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
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Kettritz R, Mohebbi N, Claus T, Kettritz U, Schneider W, Luft FC. Presumed osteosarcoma. Clin Kidney J 2013; 6:338-40. [PMID: 26064497 PMCID: PMC4400485 DOI: 10.1093/ckj/sft040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 03/15/2013] [Indexed: 11/24/2022] Open
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Schleich A, Fehr T, Gaspert A, Wüthrich RP, Mohebbi N. Unexpected deterioration of graft function after combined kidney and pancreas transplantation. Clin Kidney J 2013; 6:228-30. [PMID: 26019854 PMCID: PMC4432450 DOI: 10.1093/ckj/sft012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Accepted: 01/21/2013] [Indexed: 11/12/2022] Open
Affiliation(s)
- Andreas Schleich
- Division of Nephrology , University Hospital Zurich , Zurich , Switzerland
| | - Thomas Fehr
- Division of Nephrology , University Hospital Zurich , Zurich , Switzerland
| | - Ariana Gaspert
- Department of Surgical Pathology , University Hospital Zurich , Zurich , Switzerland
| | - Rudolf P Wüthrich
- Division of Nephrology , University Hospital Zurich , Zurich , Switzerland
| | - Nilufar Mohebbi
- Division of Nephrology , University Hospital Zurich , Zurich , Switzerland
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Mohebbi N, Perna A, van der Wijst J, Becker HM, Capasso G, Wagner CA. Regulation of two renal chloride transporters, AE1 and pendrin, by electrolytes and aldosterone. PLoS One 2013; 8:e55286. [PMID: 23383138 PMCID: PMC3561381 DOI: 10.1371/journal.pone.0055286] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2012] [Accepted: 12/21/2012] [Indexed: 01/14/2023] Open
Abstract
The renal handling of salt and protons and bicarbonate are intricately linked through shared transport mechanisms for sodium, chloride, protons, and bicarbonate. In the collecting duct, the regulated fine-tuning of salt and acid-base homeostasis is achieved by a series of transport proteins located in different cell types, intercalated and principal cells. Intercalated cells are considered to be of less importance for salt handling but recent evidence has suggested that the anion exchanger pendrin may participate in salt reabsorption and blood pressure regulation. Here, we examined the regulated expression of two functionally related but differentially expressed anion exchangers, AE1 and pendrin, by dietary electrolyte intake and aldosterone. Cortical expression of pendrin was regulated on mRNA and protein level. The combination of NaHCO3 and DOCA enhanced pendrin mRNA and protein levels, whereas DOCA or NaHCO3 alone had no effect. NaCl or KHCO3 increased pendrin mRNA, KCl decreased its mRNA abundance. On protein level, NH4Cl, NaCl, and KCl reduced pendrin expression, the other treatments were without effect. In contrast, AE1 mRNA or protein expression in kidney cortex was regulated by none of these treatments. In kidney medulla, NaHCO3/DOCA or NaHCO3 alone enhanced AE1 mRNA levels. AE1 protein abundance was increased by NH4Cl, NaHCO3/DOCA, and NaCl. Immunolocalization showed that during NH4Cl treatment the relative number of AE1 positive cells was increased and pendrin expressing cells reduced. Thus, pendrin and AE1 are differentially regulated with distinct mechanisms that separately affect mRNA and protein levels. Pendrin is regulated by acidosis and chloride intake, whereas AE1 is enhanced by acidosis, NaCl, and the combination of DOCA and NaHCO3.
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Affiliation(s)
- Nilufar Mohebbi
- Institute of Physiology and Zurich Center for Integrative Human Physiology-ZIHP, Zurich, Switzerland
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Haller M, Amatschek S, Wilflingseder J, Kainz A, Bielesz B, Pavik I, Serra A, Mohebbi N, Biber J, Wagner CA, Oberbauer R. Sirolimus induced phosphaturia is not caused by inhibition of renal apical sodium phosphate cotransporters. PLoS One 2012; 7:e39229. [PMID: 22859939 PMCID: PMC3408497 DOI: 10.1371/journal.pone.0039229] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Accepted: 05/17/2012] [Indexed: 12/01/2022] Open
Abstract
The vast majority of glomerular filtrated phosphate is reabsorbed in the proximal tubule. Posttransplant phosphaturia is common and aggravated by sirolimus immunosuppression. The cause of sirolimus induced phosphaturia however remains elusive. Male Wistar rats received sirolimus or vehicle for 2 or 7 days (1.5mg/kg). The urine phosphate/creatinine ratio was higher and serum phosphate was lower in sirolimus treated rats, fractional excretion of phosphate was elevated and renal tubular phosphate reabsorption was reduced suggesting a renal cause for hypophosphatemia. PTH was lower in sirolimus treated rats. FGF 23 levels were unchanged at day 2 but lower in sirolimus treated rats after 7 days. Brush border membrane vesicle phosphate uptake was not altered in sirolimus treated groups or by direct incubation with sirolimus. mRNA, protein abundance, and subcellular transporter distribution of NaPi-IIa, Pit-2 and NHE3 were not different between groups but NaPi-IIc mRNA expression was lower at day 7. Transcriptome analyses revealed candidate genes that could be involved in the phosphaturic response. Sirolimus caused a selective renal phosphate leakage, which was not mediated by NaPi-IIa or NaPi-IIc regulation or localization. We hypothesize that another mechanism such as a basolateral phosphate transporter may be responsible for the sirolimus induced phosphaturia.
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Affiliation(s)
- Maria Haller
- Department of Nephrology, Medical University of Vienna, Vienna, Austria
- Institute of Physiology, Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
- Department of Nephrology and Transplantation, KH Elisabethinen Linz, Linz, Austria
| | - Stefan Amatschek
- Department of Nephrology, Medical University of Vienna, Vienna, Austria
| | | | - Alexander Kainz
- Department of Nephrology, Medical University of Vienna, Vienna, Austria
| | - Bernd Bielesz
- Department of Nephrology, Medical University of Vienna, Vienna, Austria
| | - Ivana Pavik
- Institute of Physiology, Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
| | - Andreas Serra
- Institute of Physiology, Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
| | - Nilufar Mohebbi
- Institute of Physiology, Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
| | - Jürg Biber
- Institute of Physiology, Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
| | - Carsten A. Wagner
- Institute of Physiology, Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland
| | - Rainer Oberbauer
- Department of Nephrology, Medical University of Vienna, Vienna, Austria
- Department of Nephrology and Transplantation, KH Elisabethinen Linz, Linz, Austria
- Austrian Dialysis and Transplant Registry, Linz, Austria
- * E-mail:
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Mohebbi N, Vargas-Poussou R, Hegemann SCA, Schuknecht B, Kistler AD, Wüthrich RP, Wagner CA. Homozygous and compound heterozygous mutations in the ATP6V1B1 gene in patients with renal tubular acidosis and sensorineural hearing loss. Clin Genet 2012; 83:274-8. [PMID: 22509993 DOI: 10.1111/j.1399-0004.2012.01891.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Distal renal tubular acidosis (dRTA) is characterized by the inability to excrete acid in the renal collecting ducts resulting in inappropriately alkaline urine and hyperchloremic (normal anion gap) metabolic acidosis in the context of a normal (or near-normal) glomerular filtration rate. Inborn dRTA can be due to autosomal dominant or recessive gene defects. Clinical symptoms vary from mild acidosis, incidental detection of kidney stones or renal tract calcification to severe findings such as failure to thrive, severe metabolic acidosis, and nephrocalcinosis. The majority of patients with recessive dRTA present with sensorineural hearing loss (SNHL). Few cases with abnormal widening of the vestibular aqueduct have been described with dRTA. Mutations in three different genes have been identified, namely SLC4A1, ATP6V1B1, and ATP6V0A4. Patients with mutations in the ATP6V1B1 proton pump subunit develop dRTA and in most of the cases sensorineural hearing loss early in childhood. We present two patients from two different and non-consanguineous families with dRTA and SNHL. Direct sequencing of the ATP6V1B1 gene revealed that one patient harbors two homozygous mutations and the other one is a compound heterozygous. To our knowledge, this is the first case in the literature describing homozygosity in the same dRTA gene on both alleles.
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Affiliation(s)
- N Mohebbi
- Institute of Physiology and Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland.
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Abstract
A 42-year old woman was referred for a metabolic evaluation after two episodes of kidney stones. Her laboratory results revealed a normal anion-gap metabolic acidosis, a marked hypocitraturia (0,6 mmol/24h; norm 1,6-4,5) and a urinary pH of 7,0 confirming renal tubular acidosis (RTA). We identified topiramate, our patient's medication for migraine, as the cause of the RTA. Topiramate, a carboanhydrase inhibitor leads to RTA of a mixed (proximal and distal) type and thus significantly increases the risk for kidney stones.
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Affiliation(s)
- L Gerber
- Klinik für Nephrologie, Universitätsspital Zürich, Switzerland
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Mohebbi N, Benabbas C, Vidal S, Daryadel A, Bourgeois S, Velic A, Ludwig MG, Seuwen K, Wagner CA. The proton-activated G protein coupled receptor OGR1 acutely regulates the activity of epithelial proton transport proteins. Cell Physiol Biochem 2012; 29:313-24. [PMID: 22508039 DOI: 10.1159/000338486] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/28/2012] [Indexed: 01/06/2023] Open
Abstract
The Ovarian cancer G protein-coupled Receptor 1 (OGR1; GPR68) is proton-sensitive in the pH range of 6.8 - 7.8. However, its physiological function is not defined to date. OGR1 signals via inositol trisphosphate and intracellular calcium, albeit downstream events are unclear. To elucidate OGR1 function further, we transfected HEK293 cells with active OGR1 receptor or a mutant lacking 5 histidine residues (H5Phe-OGR1). An acute switch of extracellular pH from 8 to 7.1 (10 nmol/l vs 90 nmol/l protons) stimulated NHE and H(+)-ATPase activity in OGR1-transfected cells, but not in H5Phe-OGR1-transfected cells. ZnCl(2) and CuCl(2) that both inhibit OGR1 reduced the stimulatory effect. The activity was blocked by chelerythrine, whereas the ERK1/2 inhibitor PD 098059 had no inhibitory effect. OGR1 activation increased intracellular calcium in transfected HEK293 cells. We next isolated proximal tubules from kidneys of wild-type and OGR1-deficient mice and measured the effect of extracellular pH on NHE activity in vitro. Deletion of OGR1 affected the pH-dependent proton extrusion, however, in the opposite direction as expected from cell culture experiments. Upregulated expression of the pH-sensitive kinase Pyk2 in OGR1 KO mouse proximal tubule cells may compensate for the loss of OGR1. Thus, we present the first evidence that OGR1 modulates the activity of two major plasma membrane proton transport systems. OGR1 may be involved in the regulation of plasma membrane transport proteins and intra- and/or extracellular pH.
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Affiliation(s)
- Nilufar Mohebbi
- Institute of Physiology and Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
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