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Tio MC, Zhu X, Lirette S, Rule AD, Butler K, Hall ME, Dossabhoy NR, Mosley T, Shafi T. External Validation of a Novel Multimarker GFR Estimating Equation. KIDNEY360 2023; 4:1680-1689. [PMID: 37986202 PMCID: PMC10758515 DOI: 10.34067/kid.0000000000000304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 10/26/2023] [Indexed: 11/22/2023]
Abstract
Key Points Using multiple markers may improve GFR estimation especially in settings where creatinine and cystatin C are known to be limited. Panel eGFR is a novel multimarker eGFR equation consisting of age, sex, cystatin C, and nuclear magnetic resonance–measured creatinine, valine, and myo-inositol. eGFR-Cr and eGFR-Cr-CysC may underestimate measured GFR, while panel eGFR was unbiased among younger Black male individuals. Background Using multiple markers may improve accuracy in GFR estimation. We sought to externally validate and compare the performance of a novel multimarker eGFR (panel eGFR) equation among Black and White persons using the Genetic Epidemiology Network of Arteriopathy cohort. Methods We included 224 sex, race/ethnicity, and measured GFR (mGFR) category–matched persons, with GFR measured using urinary clearance of iothalamate. We calculated panel eGFR using serum creatinine, valine, myo-inositol, cystatin C, age, and sex. We compared its reliability with current eGFR equations (2021 CKD Epidemiology Collaboration creatinine [eGFR-Cr] and creatinine with cystatin C [eGFR-Cr-CysC]) using median bias, precision, and accuracy metrics. We evaluated each equation's performance in age, sex, and race subgroups. Results In the overall cohort, 49% were Black individuals, and mean mGFR was 79 ml/min per 1.73 m2. Panel eGFR overestimated mGFR (bias: −2.4 ml/min per 1.73 m2; 95% confidence interval [CI], −4.4 to −0.7), eGFR-Cr-CysC underestimated mGFR (bias: 4.8 ml/min per 1.73 m2; 95% CI, 2.1 to 6.7), while eGFR-Cr was unbiased (bias: 2.0 ml/min per 1.73 m2; 95% CI, −1.1 to 4.6). All equations had comparable accuracy. Among Black male individuals younger than 65 years, both eGFR-Cr (bias: 17.0 ml/min per 1.73 m2; 95% CI, 8.6 to 23.5) and eGFR-Cr-CysC (bias: 14.5 ml/min per 1.73 m2; 95% CI, 6.0 to 19.7) underestimated mGFR, whereas panel eGFR was unbiased (bias: 1.7 ml/min per 1.73 m2; 95% CI, −3.4 to 10.0). Metrics of accuracy for all eGFRs were acceptable in all subgroups except for panel eGFR in Black female individuals younger than 65 years (P30: 73.3%). Conclusions Panel eGFR can be used to estimate mGFR and may have utility among Black male individuals younger than 65 years where current CKD Epidemiology Collaboration equations are biased.
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Affiliation(s)
- Maria Clarissa Tio
- Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Xiaoqian Zhu
- Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
- Department of Data Science, Bower School of Population Health, University of Mississippi Medical Center, Jackson, Mississippi
| | - Seth Lirette
- Department of Data Science, Bower School of Population Health, University of Mississippi Medical Center, Jackson, Mississippi
| | - Andrew D. Rule
- Division of Nephrology and Hypertension, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
| | - Kenneth Butler
- The Memory Impairment and Neurodegenerative Dementia (MIND) Center, University of Mississippi Medical Center, Jackson, Mississippi
| | - Michael E. Hall
- Division of Cardiology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Neville R. Dossabhoy
- Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Thomas Mosley
- The Memory Impairment and Neurodegenerative Dementia (MIND) Center, University of Mississippi Medical Center, Jackson, Mississippi
| | - Tariq Shafi
- Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
- Division of Kidney Diseases, Hypertension & Transplantation, Department of Medicine, Houston Methodist Hospital, Houston, Texas
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Lepping RJ, Montgomery RN, Sharma P, Mahnken JD, Vidoni ED, Choi IY, Sarnak MJ, Brooks WM, Burns JM, Gupta A. Normalization of Cerebral Blood Flow, Neurochemicals, and White Matter Integrity after Kidney Transplantation. J Am Soc Nephrol 2021; 32:177-187. [PMID: 33067382 PMCID: PMC7894653 DOI: 10.1681/asn.2020050584] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 09/06/2020] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND CKD is associated with abnormalities in cerebral blood flow, cerebral neurochemical concentrations, and white matter integrity. Each of these is associated with adverse clinical consequences in the non-CKD population, which may explain the high prevalence of dementia and stroke in ESKD. Because cognition improves after kidney transplantation, comparing these brain abnormalities before and after kidney transplantation may identify potential reversibility in ESKD-associated brain abnormalities. METHODS In this study of patients with ESKD and age-matched healthy controls, we used arterial spin labeling to assess the effects of kidney transplantation on cerebral blood flow and magnetic resonance spectroscopic imaging to measure cerebral neurochemical concentrations (N-acetylaspartate, choline, glutamate, glutamine, myo-inositol, and total creatine). We also assessed white matter integrity measured by fractional anisotropy (FA) and mean diffusivity (MD) with diffusion tensor imaging. We used a linear mixed model analysis to compare longitudinal, repeated brain magnetic resonance imaging measurements before, 3 months after, and 12 months after transplantation and compared these findings with those of healthy controls. RESULTS Study participants included 29 patients with ESKD and 19 controls; 22 patients completed post-transplant magnetic resonance imaging. Cerebral blood flow, which was higher in patients pretransplant compared with controls (P=0.003), decreased post-transplant (P<0.001) to values in controls. Concentrations of neurochemicals choline and myo-inositol that were higher pretransplant compared with controls (P=0.001 and P<0.001, respectively) also normalized post-transplant (P<0.001 and P<0.001, respectively). FA increased (P=0.001) and MD decreased (P<0.001) post-transplant. CONCLUSIONS Certain brain abnormalities in CKD are reversible and normalize with kidney transplantation. Further studies are needed to understand the mechanisms underlying these brain abnormalities and to explore interventions to mitigate them even in patients who cannot be transplanted. CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER Cognitive Impairment and Imaging Correlates in End Stage Renal Disease, NCT01883349.
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Affiliation(s)
- Rebecca J. Lepping
- Hoglund Biomedical Imaging Center, Kansas City, Kansas,University of Kansas Alzheimer’s Disease Center, Fairway, Kansas
| | - Robert N. Montgomery
- Department of Biostatistics and Data Science, University of Kansas Medical Center, Kansas City, Kansas
| | - Palash Sharma
- Department of Biostatistics and Data Science, University of Kansas Medical Center, Kansas City, Kansas
| | - Jonathan D. Mahnken
- University of Kansas Alzheimer’s Disease Center, Fairway, Kansas,Department of Biostatistics and Data Science, University of Kansas Medical Center, Kansas City, Kansas
| | - Eric D. Vidoni
- University of Kansas Alzheimer’s Disease Center, Fairway, Kansas,Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas
| | - In-Young Choi
- Hoglund Biomedical Imaging Center, Kansas City, Kansas,Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas
| | - Mark J. Sarnak
- Division of Nephrology and Hypertension, Department of Internal Medicine, Tufts Medical Center, Boston, Massachusetts
| | - William M. Brooks
- Hoglund Biomedical Imaging Center, Kansas City, Kansas,University of Kansas Alzheimer’s Disease Center, Fairway, Kansas,Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas,Frontiers: University of Kanas Clinical and Translational Science Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Jeffrey M. Burns
- University of Kansas Alzheimer’s Disease Center, Fairway, Kansas,Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas,Frontiers: University of Kanas Clinical and Translational Science Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Aditi Gupta
- University of Kansas Alzheimer’s Disease Center, Fairway, Kansas,Division of Nephrology and Hypertension, Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas,The Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
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Kordalewska M, Macioszek S, Wawrzyniak R, Sikorska-Wiśniewska M, Śledziński T, Chmielewski M, Mika A, Markuszewski MJ. Multiplatform metabolomics provides insight into the molecular basis of chronic kidney disease. J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1117:49-57. [DOI: 10.1016/j.jchromb.2019.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 01/18/2019] [Accepted: 04/01/2019] [Indexed: 12/24/2022]
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A guanidine-appended scyllo-inositol derivative AAD-66 enhances brain delivery and ameliorates Alzheimer's phenotypes. Sci Rep 2017; 7:14125. [PMID: 29074878 PMCID: PMC5658413 DOI: 10.1038/s41598-017-14559-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Accepted: 10/11/2017] [Indexed: 01/20/2023] Open
Abstract
Alzheimer's disease (AD) is a degenerative brain disease that destroys memory and other important mental functions but lacks efficient therapeutic agents. Blocking toxic amyloid β (Aβ) could be beneficial for AD and represents a promising therapeutic strategy for AD treatment. scyllo-Inositol (SI) is a potential therapeutic for AD by directly interacting with the Aβ peptide to inhibit Aβ42 fiber formation. Clinical studies of SI showed promising benefits on mild to moderate AD, however, with limitations on dosage regime. A new strategy to enhance the brain delivery of SI is needed to achieve the efficacy with minimum adverse effects. Herein, we report that a novel guanidine-appended SI derivative AAD-66 resulted in more effective reductions of brain Aβ and plaque deposits, gliosis, and behavioral memory deficits in the disease-established 5xFAD mice. Overall, our present study reveals the potential of AAD-66 as a promising therapeutic agent for AD.
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Inamoto Y, Hiraga Y, Hanai T, Kinosita T. The development of a sensitive myo-inositol analyser using a liquid chromatograph with a post-label fluorescence detector. Biomed Chromatogr 1995; 9:146-9. [PMID: 7655303 DOI: 10.1002/bmc.1130090307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A sensitive liquid chromatographic analysis for myo-inositol was developed using glycocyamine as the post-labelling reagent. The sensitivity was 500 pmol/injection. The system was applied to analyse myo-inositol in sera from eight patients with chronic renal failure. The average concentration of serum myo-inositol was 498.6 +/- 257.0 mumol/L before haemodialysis, and 244.0 +/- 131.1 mumol/L after haemodialysis. These results indicated that the kidney is the main site of myo-inositol metabolism.
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Affiliation(s)
- Y Inamoto
- Teikoku Seiyaku Co., Ltd., Kagawa, Japan
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