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Suhail M. Biophysical chemistry behind sickle cell anemia and the mechanism of voxelotor action. Sci Rep 2024; 14:1861. [PMID: 38253605 PMCID: PMC10803371 DOI: 10.1038/s41598-024-52476-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 01/19/2024] [Indexed: 01/24/2024] Open
Abstract
Sickle cell anemia disease has been a great challenge to the world in the present situation. It occurs only due to the polymerization of sickle hemoglobin (HbS) having Pro-Val-Glu typed mutation, while the polymerization does not occur in normal hemoglobin (HbA) having Pro-Glu-Glu peptides. It is also well confirmed that the oxygenated HbS (OHbS) does not participate in the polymerization, while the deoxygenated HbS (dHbS) does, which causes the shape of red blood cells sickled. After polymerization, the blood has a low oxygen affinity. Keeping this fact into consideration, only those drugs are being synthesized that stabilize the OHbS structure so that the polymerization of HbS can be stopped. The literature data showed no systematic description of the changes occurring during the OHbS conversion to dHbS before polymerization. Hence, an innovative reasonable study between HbA and HbS, when they convert into their deoxygenated forms, was done computationally. In this evaluation, physiochemical parameters in HbA/HbS before and after deoxygenation were studied and compared deeply. The computationally collected data was used to understand the abnormal behaviour of dHbS arising due to the replacement of Glu6 with Val6. Consequently, during the presented computational study, the changes occurring in HbS were found opposite/abnormal as compared to HbA after the deoxygenation of both. The mechanism of Voxelotor (GBT-440) action to stop the HbS polymerization was also explained with the help of computationally collected data. Besides, a comparative study between GBT-440 and another suggested drug was also done to know their antisickling strength. Additionally, the effect of pH, CO, CO2, and 2,3-diphosphoglycerate (2,3-DPG) on HbS structure was also studied computationally.
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Affiliation(s)
- Mohd Suhail
- Department of Chemistry, Siddhartha (PG) College, Aakhlor Kheri, Deoband (Saharanpur), Uttar Pradesh, 247554, India.
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2
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Bartolucci P. Exploration de l’hémolyse associée à la drépanocytose et perspectives thérapeutiques spécifiques. Rev Med Interne 2023; 44:4S7-4S11. [PMID: 38049244 DOI: 10.1016/s0248-8663(23)01303-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
Sickle Cell Anemia is a disease with a strong vascular tropism. Beyond anemia, the pathophysiological mechanisms responsible for hemolysis, directly affect both acute and chronic vascular damages, thus resulting in a systemic disease. Understanding the different types of hemolysis underline the need for novel specific biomarkers. Targeted therapeutic approaches for these pathophysiological pathways are necessary to improve Sickle Cell patients' prognosis. Finally, given its complexity, Sickle Cell Disease is often used as a "proof of concept" for other pathologies. It seems likely that the rapidly evolving knowledge in this field will also benefit other diseases. © 2023 Société nationale française de médecine interne (SNFMI). Published by Elsevier Masson SAS. All rights reserved.
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Affiliation(s)
- P Bartolucci
- Recherche IH, EFS Créteil-Mondor, Créteil, France; IMRB Inserm 955, équipe Pirenne, Créteil, France; Centre de références des syndromes drépanocytaires majeures, hôpital Henri-Mondor, Créteil, France; Université Paris-Est Créteil, Créteil, France.
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3
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d'Humières T, Saba J, Savale L, Dupuy M, Boyer L, Guillet H, Alassaad L, de Luna G, Iles S, Pham Hung d'Alexandry d'Orengiani AL, Zaouali Y, Boukour N, Pelinski Y, Messonnier L, Audureau E, Derbel H, Habibi A, Lellouche N, Derumeaux G, Bartolucci P. Determinants of ventricular arrhythmias in sickle cell anemia: toward better prevention of sudden cardiac death. Blood 2023; 142:409-420. [PMID: 37216685 DOI: 10.1182/blood.2022019571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 05/24/2023] Open
Abstract
Sudden death is 1 of the leading causes of death in adults with sickle cell anemia (SCA) but its etiology remains mostly unknown. Ventricular arrhythmia (VA) carries an increased risk of sudden death; however, its prevalence and determinants in SCA are poorly studied. This study aimed to identify the prevalence and predictors of VA in patients with SCA. From 2019 to 2022, 100 patients with SCA were referred to the physiology department to specifically analyze cardiac function and prospectively included in the DREPACOEUR registry. They underwent a 24-hour electrocardiogram monitoring (24h-Holter), transthoracic echocardiography, and laboratory tests on the same day. The primary end point was the occurrence of VA, defined as sustained or nonsustained ventricular tachycardia (VT), >500 premature ventricular contractions (PVCs) on 24h-Holter, or a recent history of VT ablation. The mean patient age was 46 ± 13 years, and 48% of the patients were male. Overall, VA was observed in 22 (22%) patients. Male sex (81% vs 34%; P = .02), impaired global longitudinal strain (GLS): -16% ± 1.9% vs -18.3% ± 2.7%; P = .02), and decreased platelet count (226 ± 96 giga per liter [G/L] vs 316 ± 130 G/L) were independently associated with VA. GLS correlated with PVC load every 24 hours (r = 0.39; P < .001) and a cutoff of -17.5% could predict VA with a sensitivity of 82% and a specificity of 63%. VAs are common in patients with SCA, especially in men. This pilot study uncovered GLS as a valuable parameter for improving rhythmic risk stratification.
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MESH Headings
- Adult
- Humans
- Male
- Middle Aged
- Female
- Pilot Projects
- Arrhythmias, Cardiac/etiology
- Death, Sudden, Cardiac/epidemiology
- Death, Sudden, Cardiac/etiology
- Death, Sudden, Cardiac/prevention & control
- Tachycardia, Ventricular/diagnosis
- Tachycardia, Ventricular/etiology
- Anemia, Sickle Cell/complications
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Affiliation(s)
- Thomas d'Humières
- Department of Physiology, FHU SENEC, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, INSERM IMRB U955, Université Paris Est, Créteil, France
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
| | - Joseph Saba
- Department of Physiology, FHU SENEC, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, INSERM IMRB U955, Université Paris Est, Créteil, France
| | - Laurent Savale
- Department of Respiratory and Intensive Care Medicine, Pulmonary Hypertension National Referral Center, Hôpital Bicêtre, Assistance Publique Hôpitaux de Paris, Université Paris-Saclay, School of Medicine, Le Kremlin-Bicêtre, France
- INSERM UMR_S 999 Pulmonary Hypertension, Pathophysiology and Novel Therapies, Hôpital Marie Lannelongue, Le Plessis-Robinson, France
| | - Marie Dupuy
- Department of Physiology, FHU SENEC, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, INSERM IMRB U955, Université Paris Est, Créteil, France
| | - Laurent Boyer
- Department of Physiology, FHU SENEC, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, INSERM IMRB U955, Université Paris Est, Créteil, France
| | - Henri Guillet
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
- Department of Internal Medicine, Henri-Mondor University Hospital-UPEC, Assistance Publique-Hôpitaux de Paris, Créteil, France
| | - Lara Alassaad
- Department of Physiology, FHU SENEC, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, INSERM IMRB U955, Université Paris Est, Créteil, France
| | - Gonzalo de Luna
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
- Department of Internal Medicine, Henri-Mondor University Hospital-UPEC, Assistance Publique-Hôpitaux de Paris, Créteil, France
| | - Sihem Iles
- Department of Physiology, FHU SENEC, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, INSERM IMRB U955, Université Paris Est, Créteil, France
| | - Anne L Pham Hung d'Alexandry d'Orengiani
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
| | - Yosr Zaouali
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
| | - Nouhaila Boukour
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
| | - Yanis Pelinski
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
| | - Laurent Messonnier
- Inter-university Laboratory of Human Movement Sciences EA 7424, Université Savoie Mont Blanc, Chambéry, France
| | - Etienne Audureau
- Department of Biostatistics, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, CEpiA IMRB U955, FHU SENEC, Université Paris Est, Créteil, France
| | - Haytham Derbel
- Department of Radiology, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, Université Paris Est, Créteil, France
| | - Anoosha Habibi
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
- Department of Internal Medicine, Henri-Mondor University Hospital-UPEC, Assistance Publique-Hôpitaux de Paris, Créteil, France
| | - Nicolas Lellouche
- Department of Cardiology, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, Université Paris Est, Créteil, France
| | - Geneviève Derumeaux
- Department of Physiology, FHU SENEC, Henri Mondor Hospital, Assistance Publique Hôpitaux de Paris, INSERM IMRB U955, Université Paris Est, Créteil, France
| | - Pablo Bartolucci
- Sickle Cell Referral Center - UMGGR, Plateforme d'expertise Maladies Rares Grand Paris Est, Université Paris Est, FHU SENEC, CHU Henri Mondor, Assistance Publique Hôpitaux de Paris, Créteil, France
- Department of Internal Medicine, Henri-Mondor University Hospital-UPEC, Assistance Publique-Hôpitaux de Paris, Créteil, France
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4
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Martino S, Turki RC, Zouiti F, Fort R, Pakdaman S, Forté S, Menouche D, Calvet D, Rupp T, Pirenne F, Bartolucci P. Near-Infrared Spectroscopy Demonstrates the Benefit of Erythracytapheresis in Sickle Cell Disease Adult Patients with Cerebral Vasculopathy. J Clin Med 2023; 12:jcm12041256. [PMID: 36835792 PMCID: PMC9966188 DOI: 10.3390/jcm12041256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/26/2023] [Accepted: 02/03/2023] [Indexed: 02/09/2023] Open
Abstract
BACKGROUND Cerebral vasculopathy can induce chronic cerebral hypoperfusion leading to stroke in patients with sickle cell disease (SCD) and is treated by blood exchange transfusion (BET). However, no prospective clinical study has demonstrated the benefit of BET in adults with SCD and cerebral vasculopathy. Near Infrared Spectroscopy (NIRS) is a recent non-invasive method complementary to Magnetic Resonance Imaging (MRI). We evaluated cerebral perfusion using NIRS during erythracytapheresis in patients with SCD with and without steno-occlusive arterial disease. METHODS We conducted a monocentric, prospective study in 16 adults with SCD undergoing erythracytapheresis in 2014. Among them, 10 had cerebral steno-occlusive arterial disease. NIRS measured the relative amounts of oxyhemoglobin (OxyHb), deoxyhemoglobin (DeoxyHb) and total hemoglobin (Total Hb) in brain tissue and in muscle. RESULTS In cerebral hemispheres associated with steno-occlusive arterial disease, we observed a significant increase of OxyHb and Total Hb during BET, without modification of DeoxyHb. CONCLUSION Using NIRS during BET showed that BET improves cerebral perfusion in adult patients with SCD with cerebral vasculopathy.
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Affiliation(s)
- Suella Martino
- Sickle Cell Referral Center, Department of Internal Medicine, Henri Mondor University Hospital, UPEC, APHP, 94000 Creteil, France
| | - Rym Chouk Turki
- Etablissement Français du Sang, Île-de-France Mondor, 94000 Creteil, France
| | - Fouzia Zouiti
- Etablissement Français du Sang, Île-de-France Mondor, 94000 Creteil, France
| | - Romain Fort
- Department of Internal Medicine, Edouard Herriot University Hospital, 69003 Lyon, France
| | - Sadaf Pakdaman
- Etablissement Français du Sang, Île-de-France Mondor, 94000 Creteil, France
| | - Stéphanie Forté
- Division of Hematology and Oncology, Department of Medicine, Centre Hospitalier de l'Université de Montréal, Montreal, QC H2X 3E4, Canada
| | - Dehbia Menouche
- Department of Apheresis, Henri Mondor University Hospital, UPEC, APHP, 94000 Creteil, France
| | - David Calvet
- Department of Neurology, Sainte-Anne Hospital, 75014 Paris, France
| | - Thomas Rupp
- Interuniversity Laboratory of Human Movement Biology, University Savoie Mont Blanc, 73000 Chambery, France
| | - France Pirenne
- Etablissement Français du Sang, Île-de-France Mondor, 94000 Creteil, France
- Laboratoire D’Excellence, GRex, Institut Mondor, INSERM U955 Equipe 2, 94000 Creteil, France
| | - Pablo Bartolucci
- Sickle Cell Referral Center, Department of Internal Medicine, Henri Mondor University Hospital, UPEC, APHP, 94000 Creteil, France
- Laboratoire D’Excellence, GRex, Institut Mondor, INSERM U955 Equipe 2, 94000 Creteil, France
- Correspondence:
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5
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Afzali-Hashemi L, Václavů L, Wood JC, Biemond BJ, Nederveen AJ, Mutsaerts HJ, Schrantee A. Assessment of functional shunting in patients with sickle cell disease. Haematologica 2022; 107:2708-2719. [PMID: 35548868 PMCID: PMC9614535 DOI: 10.3324/haematol.2021.280183] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Indexed: 01/26/2023] Open
Abstract
Silent cerebral infarcts (SCI) are common in patients with sickle cell disease (SCD) and are thought to be caused by a mismatch between oxygen delivery and consumption. Functional cerebrovascular shunting is defined as reduced oxygen offloading due to the rapid transit of blood through the capillaries caused by increased flow and has been suggested as a potential mechanism underlying reduced oxygenation and SCI. We investigated the venous arterial spin labeling signal (VS) in the sagittal sinus as a proxy biomarker of cerebral functional shunting, and its association with hemodynamic imaging and hematological laboratory parameters. We included 28 children and 38 adults with SCD, and ten healthy racematched adult controls. VS, cerebral blood flow (CBF), velocity in the brain feeding arteries, oxygen extraction fraction (OEF) and cerebral metabolic rate of oxygen (CMRO2) were measured before and after acetazolamide administration. VS was higher in patients with SCD compared to controls (P<0.01) and was increased after acetazolamide administration in all groups (P<0.01). VS was primarily predicted by CBF (P<0.01), but CBF-corrected VS was also associated with decreased CMRO2 (P<0.01). Additionally, higher disease severity defined by low hemoglobin and increased hemolysis was associated with higher CBF-corrected VS. Finally, CMRO2 was negatively correlated with fetal hemoglobin, and positively correlated with lactate dehydrogenase, which could be explained by changes in oxygen affinity. These findings provide evidence for cerebral functional shunting and encourage future studies investigating the potential link to aberrant capillary exchange in SCD.
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Affiliation(s)
- Liza Afzali-Hashemi
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | - Lena Václavů
- C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - John C. Wood
- Division of Cardiology, Children’s Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Bart J. Biemond
- Department of Hematology, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | - Aart J. Nederveen
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | - Henk J.M.M. Mutsaerts
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam, the Netherlands,HJMMM and AS contributed equally as co-senior authors
| | - Anouk Schrantee
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam, the Netherlands,HJMMM and AS contributed equally as co-senior authors
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6
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Tian XL, Lu X, Lyu YM, Zhao H, Liu QJ, Tian M. Analysis of Red Blood Cells and their Components in Medical Workers with Occupational Exposure to Low-Dose Ionizing Radiation. Dose Response 2022; 20:15593258221081373. [PMID: 35237116 PMCID: PMC8882952 DOI: 10.1177/15593258221081373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 01/31/2022] [Indexed: 11/16/2022] Open
Abstract
Plenty of reports focus on the effects of low-dose radiation (LDR) on peripheral blood lymphocytes in radiation workers. However, studies on red blood cells (RBCs) in radiation workers are rarely reported. Many studies focused on investigate the hemogram of radiation staffs without detecting other components of RBCs. To explore the potential effect of LDR on RBCs, we detected the level of RBC count, hemoglobin, 2,3-disphosphoglycerate (2,3-DPG), and glutathione (GSH), and then analyzed the factors on these indices in 106 medical radiation workers. As a result, RBC count was affected by sex, age, type of work, length of service (only for females), and annual effective dose (only for males). Hemoglobin status was affected by sex, type of work, and annual effective dose (only for males). Sex, age, and type of work had no effects on the concentration of 2,3-DPG and GSH. Length of service affected 2,3-DPG concentration, and annual effective dose affected GSH level. In conclusion, chronic occupational LDR exposure may have an effect on RBC count, hemoglobin status, and the concentration of 2,3-DPG and GSH in radiation workers to some extent. However, it is still unknown how this kind of influence affects the health of radiation workers.
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Affiliation(s)
- Xue-Lei Tian
- China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing, P.R. China
| | - Xue Lu
- China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing, P.R. China
| | - Yu-Min Lyu
- Laboratory of Toxicology, Henan Institute of Occupational Medicine, Zheng Zhou, P.R. China
| | - Hua Zhao
- China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing, P.R. China
| | - Qing-Jie Liu
- China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing, P.R. China
| | - Mei Tian
- China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing, P.R. China
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7
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Vu C, Bush A, Choi S, Borzage M, Miao X, Nederveen AJ, Coates TD, Wood JC. Reduced global cerebral oxygen metabolic rate in sickle cell disease and chronic anemias. Am J Hematol 2021; 96:901-913. [PMID: 33891719 PMCID: PMC8273150 DOI: 10.1002/ajh.26203] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 04/19/2021] [Accepted: 04/21/2021] [Indexed: 12/18/2022]
Abstract
Anemia is the most common blood disorder in the world. In patients with chronic anemia, such as sickle cell disease or major thalassemia, cerebral blood flow increases to compensate for decreased oxygen content. However, the effects of chronic anemia on oxygen extraction fraction (OEF) and cerebral metabolic rate of oxygen (CMRO2 ) are less well understood. In this study, we examined 47 sickle-cell anemia subjects (age 21.7 ± 7.1, female 45%), 27 non-sickle anemic subjects (age 25.0 ± 10.4, female 52%) and 44 healthy controls (age 26.4 ± 10.6, female 71%) using MRI metrics of brain oxygenation and flow. Phase contrast MRI was used to measure resting cerebral blood flow, while T2 -relaxation-under-spin-tagging (TRUST) MRI with disease appropriate calibrations were used to measure OEF and CMRO2 . We observed that patients with sickle cell disease and other chronic anemias have decreased OEF and CMRO2 (respectively 27.4 ± 4.1% and 3.39 ± 0.71 ml O2 /100 g/min in sickle cell disease, 30.8 ± 5.2% and 3.53 ± 0.64 ml O2 /100 g/min in other anemias) compared to controls (36.7 ± 6.0% and 4.00 ± 0.65 ml O2 /100 g/min). Impaired CMRO2 was proportional to the degree of anemia severity. We further demonstrate striking concordance of the present work with pooled historical data from patients having broad etiologies for their anemia. The reduced cerebral oxygen extraction and metabolism are consistent with emerging data demonstrating increased non-nutritive flow, or physiological shunting, in sickle cell disease patients.
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Affiliation(s)
- Chau Vu
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA
| | - Adam Bush
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA
- Department of Radiology, Stanford University, Stanford, CA
| | - Soyoung Choi
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA
| | - Matthew Borzage
- Division of Neonatology, Fetal and Neonatal Institute, Children’s Hospital Los Angeles, Los Angeles, CA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - Xin Miao
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA
| | - Aart J. Nederveen
- University of Amsterdam, Amsterdam UMC, Radiology and Nuclear Medicine, the Netherlands
| | - Thomas D. Coates
- Division of Hematology-Oncology, Department of Pediatrics, Children’s Hospital Los Angeles, Los Angeles, CA
- Departments of Pediatrics and Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - John C. Wood
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA
- Division of Cardiology, Departments of Pediatrics and Radiology, Children’s Hospital Los Angeles, Los Angeles, CA
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8
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Inusa BPD, Liguoro I, Tayo B, Booth C, Turner C, Dalton NR. Reliability of different estimated glomerular filtration rate as measures of renal function in children with sickle cell disease. Blood Cells Mol Dis 2021; 91:102590. [PMID: 34256313 DOI: 10.1016/j.bcmd.2021.102590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 06/12/2021] [Accepted: 06/24/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND There is no reliable marker for detecting early renal disease in early children with sickle cell disease (SCD). Estimation of glomerular filtration rate (eGFR) as derived from the height/plasma creatinine formula is dependent on the accuracy of the creatinine analytical method used. The aim of this study was to evaluate different equations for eGFR. METHODS Children aged 5-16 years recruited. mGFR was obtained using plasma disappearance of Inutest/Iohexol, serum creatinine (SCr) was measured either by standard laboratory method or by tandem mass spectrometry (MSMS). Estimated GFR was then calculated either by "Bedside Schwartz method" or by the full-age spectrum (FAS) equation. FINDINGS A total of 79 patients (mean age 9.8 ± 4.0 years). A revised eGFR constant was calculated for Schwartz equation from the slope of the plot of height/plasma creatinine versus mGFR. Mean values for mGFR (132.7 ± 32.1 ml/min/1.73m2) and eGFR methods compared: eGFR from standard SCr was significantly higher (144.2 ± 37.3 ml/min/1.73m2, p = 0.008). The MSMS eGFR showed the lowest SD (SD = 27.5), while both FAS eGFR and FAS-height eGFR showed the highest correlation coefficient (r = 0.67). INTERPRETATION eGFR calculation based on height and SCr determined with MSMS traceable creatinine is more reliable than Schwartz formula using jaffe/enzymatic methods in SCD children.
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Affiliation(s)
- Baba Psalm Duniya Inusa
- Paediatric Haematology, Evelina London Children's Hospital, Guy's & St Thomas' NHS Foundation Trust, London, UK.
| | - Ilaria Liguoro
- Department of Medicine, Division of Pediatrics, University of Udine, Italy
| | - Bamidele Tayo
- Department of Public Health Sciences, Parkinson School of Health Sciences and Public Health, Loyola University Chicago, Maywood, USA
| | - Caroline Booth
- Department of Nephrology, Evelina London Children's Hospital, Guy's and St Thomas NHS Foundation Trust, United Kingdom
| | - Charles Turner
- WellChild Laboratory, Evelina London Children's Hospital, Guy's and St Thomas NHS Foundation Trust, United Kingdom
| | - Neil R Dalton
- WellChild Laboratory, Evelina London Children's Hospital, Guy's and St Thomas NHS Foundation Trust, United Kingdom
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9
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Ex Vivo Activation of Red Blood Cell Senescence by Plasma from Sickle-Cell Disease Patients: Correlation between Markers and Adhesion Consequences during Acute Disease Events. Biomolecules 2021; 11:biom11070963. [PMID: 34208829 PMCID: PMC8301992 DOI: 10.3390/biom11070963] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/23/2021] [Accepted: 06/24/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND: Blood transfusion remains a key treatment for managing occlusive episodes and painful crises in sickle-cell disease (SCD). In that clinical context, red blood cells (RBCs) from donors and transfused to patients, may be affected by plasma components in the recipients’ blood. Senescence lesion markers appear on the red cells after transfusion, shortening the RBC lifespan in circulation. In the specific context of SCD, senescence signals can also trigger the occlusive painful events, typical of the disease. This work follows through our previous data that described a RBC senescence process, rapidly detected after challenge with SCD pathological plasmas. In this clinical context, we wanted here to further explore the characteristics and physiologic consequences of AA RBC lesions associated with senescence, as lesions caused by RBCs after transfusion may have adverse consequences for SCD patients. METHODS: Plasma samples from SCD patients, with acute symptoms (n = 20) or steady-state disease (n = 34) were co-incubated with donor AA RBCs from blood units for 24 to 48 h. Specific markers signing RBC senescence were quantified after the incubation with SCD plasma samples. The physiologic in-flow adhesion was investigated on senescent RBCs, an in vitro technic into biochips that mimic adherence of RBCs during the occlusive events of SCD. RESULTS: Senescence markers on AA RBCs, together with their in-flow adhesion to the plasma-bridging protein thrombospondin, were associated with the clinical status of the SCD patients from whom plasma was obtained. In these experiments, the highest values were obtained for SCD acute plasma samples. Adhesion of senescent RBCs into biochips, which is not reversed by a pre-treatment with recombinant Annexin V, can be reproduced with the use of chemical agents acting on RBC membrane channels that regulate either Ca2+ entry or modulating RBC hydration. CONCLUSION: We found that markers on red cells are correlated, and that the senescence induced by SCD plasma provokes the adhesion of RBCs to the vessel wall protein thrombospondin. In-flow adhesion of senescent red cells after plasma co-incubations can be reproduced with the use of modulators of RBC membrane channels; activating the Piezo1 Ca2+ mechanosensitive channel provokes RBC adhesion of normal (non-senescent) RBCs, while blocking the Ca2+-dependent K+ Gardos channel, can reverse it. Clinically modulating the RBC adhesion to vascular wall proteins might be a promising avenue for the treatment of painful occlusive events in SCD.
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10
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Conran N, Embury SH. Sickle cell vaso-occlusion: The dialectic between red cells and white cells. Exp Biol Med (Maywood) 2021; 246:1458-1472. [PMID: 33794696 DOI: 10.1177/15353702211005392] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The pathophysiology of sickle cell anemia, a hereditary hemoglobinopathy, has fascinated clinicians and scientists alike since its description over 100 years ago. A single gene mutation in the HBB gene results in the production of abnormal hemoglobin (Hb) S, whose polymerization when deoxygenated alters the physiochemical properties of red blood cells, in turn triggering pan-cellular activation and pathological mechanisms that include hemolysis, vaso-occlusion, and ischemia-reperfusion to result in the varied and severe complications of the disease. Now widely regarded as an inflammatory disease, in recent years attention has included the role of leukocytes in vaso-occlusive processes in view of the part that these cells play in innate immune processes, their inherent ability to adhere to the endothelium when activated, and their sheer physical and potentially obstructive size. Here, we consider the role of sickle red blood cell populations in elucidating the importance of adhesion vis-a-vis polymerization in vaso-occlusion, review the direct adhesion of sickle red cells to the endothelium in vaso-occlusive processes, and discuss how red cell- and leukocyte-centered mechanisms are not mutually exclusive. Given the initial clinical success of crizanlizumab, a specific anti-P selectin therapy, we suggest that it is appropriate to take a holistic approach to understanding and exploring the complexity of vaso-occlusive mechanisms and the adhesive roles of the varied cell types, including endothelial cells, platelets, leukocytes, and red blood cells.
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Affiliation(s)
- Nicola Conran
- Hematology Center, University of Campinas-UNICAMP, Barão Geraldo 13083-8, Campinas, SP, Brazil
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11
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Rankine-Mullings AE, Owusu-Ofori S. Prophylactic antibiotics for preventing pneumococcal infection in children with sickle cell disease. Cochrane Database Syst Rev 2021; 3:CD003427. [PMID: 33724440 PMCID: PMC8092646 DOI: 10.1002/14651858.cd003427.pub5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Sickle cell disease (SCD) is a group of inherited disorders that result in haemoglobin abnormalities and other complications. Injury to the spleen, among other factors, contribute to persons with SCD being particularly susceptible to infection. Infants and very young children are especially vulnerable. The 'Co-operative Study of Sickle Cell Disease' observed an incidence rate for pneumococcal septicaemia of 10 per 100 person-years in children under the age of three years. Vaccines, including customary pneumococcal vaccines, may be of limited use in this age group. Therefore, prophylactic penicillin regimens may be advisable for this population. This is an update of a Cochrane Review which was first published in 2002, and previously updated, most recently in 2017. OBJECTIVES: To compare the effects of antibiotic prophylaxis against pneumococcus in children with SCD receiving antibiotic prophylaxis compared to those without in relation to: 1. incidence of Streptococcus pneumoniae infection; 2. mortality (as reported in the included studies); 3. drug-related adverse events (as reported in the included studies) to the individual and the community; 4. the impact of discontinuing at various ages on incidence of infection and mortality. SEARCH METHODS We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group Haemoglobinopathies Trials Register, which is comprised of references identified from comprehensive electronic database searches and also two clinical trials registries: ClinicalTrials.gov and the WHO International Registry Platform (not in 2020 given access issues relating to Covid-19 pandemic). Additionally, we carried out hand searching of relevant journals and abstract books of conference proceedings. Date of the most recent search: 25 January 2021. SELECTION CRITERIA All randomised or quasi-randomised controlled trials comparing prophylactic antibiotics to prevent pneumococcal infection in children with SCD with placebo, no treatment or a comparator drug. DATA COLLECTION AND ANALYSIS The standard methodological procedures expected by Cochrane were used. Both authors independently extracted data and assessed trial quality. The authors used the GRADE criteria to assess the certainty of the evidence. MAIN RESULTS Six trials were identified by the searches, of which three trials were eligible for inclusion. A total of 880 children, who were between three months to five years of age at randomization were included. The included studies were conducted in centres in the USA and in Kingston, Jamaica. In trials that investigated initiation of penicillin on risk of pneumococcal infection, the odds ratio was 0.37 (95% confidence interval 0.16 to 0.86) (two trials, 457 children) (low-certainty evidence), while for withdrawal the odds ratio was 0.49 (95% confidence interval 0.09 to 2.71) (one trial, 400 children) (low-certainty evidence). Adverse drug effects were rare and minor. Rates of pneumococcal infection were found to be relatively low in children over the age of five years. Overall, the certainty of the evidence for all outcomes was judged to be low. The results from the risk of bias assessment undertaken identified two domains in which the risk of bias was considered to be high, these were incomplete outcome data (attrition bias) (two trials) and allocation concealment (selection bias) (one trial). Domains considered to have a low risk of bias for all three trials were selective reporting (reporting bias) and blinding (performance and detection bias). AUTHORS' CONCLUSIONS The evidence examined was determined to be of low certainty and suggests that prophylactic penicillin significantly reduces risk of pneumococcal infection in children with homozygous SCD, and is associated with minimal adverse reactions. Further research may help to determine the ideal age to safely withdraw penicillin.
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Affiliation(s)
- Angela E Rankine-Mullings
- Sickle Cell Unit, Caribbean Institute for Health Research, University of the West Indies, Kingston, Jamaica
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12
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Liguoro I, Arigliani M, Singh B, Van Geyzel L, Chakravorty S, Bossley C, Pelidis M, Rees D, Inusa BPD, Gupta A. Beneficial effects of adenotonsillectomy in children with sickle cell disease. ERJ Open Res 2020; 6:00071-2020. [PMID: 33263027 PMCID: PMC7682659 DOI: 10.1183/23120541.00071-2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 08/02/2020] [Indexed: 12/29/2022] Open
Abstract
Tonsillectomy and adenoidectomy (T&A) is frequently performed in children with sickle cell disease (SCD). Our aim was to evaluate the impact of this surgery on overnight oxygenation and rates of complications in these patients. Children with SCD who underwent T&A between 2008 and 2014 in two tertiary hospitals were retrospectively evaluated. Overnight oximetry and admission rates due to vaso-occlusive pain episodes (VOEs) and acute chest syndrome (ACS) in the year preceding and following the surgery were compared. 19 patients (10 males, 53%) with a median age of 6 years (range 3.5–8) were included. A significant increase of mean overnight arterial oxygen saturation measured by pulse oximetry (SpO2) (from 93±3.6% to 95.3±2.8%, p=0.001), nadir SpO2 (from 83.0±7.1% to 88±4.1%, p=0.004) and a reduction of 3% oxygen desaturation index (from a median value of 5.7 to 1.8, p=0.003) were shown. The mean annual rate of ACS decreased from 0.6±1.22 to 0.1±0.2 events per patient-year (p=0.003), while the mean cumulative rate of hospitalisations for all causes and the incidence of VOEs were not affected. T&A improved nocturnal oxygenation and was also associated with a reduction in the incidence of ACS at 1-year follow-up after surgery. In children with SCD, this retrospective analysis suggests that tonsillectomy and adenoidectomy may have a beneficial effect on nocturnal oxygenation level and the rate of ACS. This finding will need further confirmation in prospective and larger studies.https://bit.ly/3gL6gaU
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Affiliation(s)
- Ilaria Liguoro
- Dept of Medicine, Division of Pediatrics, University Hospital of Udine, Udine, Italy
| | - Michele Arigliani
- Dept of Medicine, Division of Pediatrics, University Hospital of Udine, Udine, Italy
| | - Bethany Singh
- Dept of Paediatric Respiratory Medicine, King's College Hospital, London, UK.,Dept of Paediatric Haematology, King's College Hospital, London, UK
| | - Lisa Van Geyzel
- Dept of Paediatric Respiratory Medicine, King's College Hospital, London, UK
| | | | - Cara Bossley
- Dept of Paediatric Respiratory Medicine, King's College Hospital, London, UK
| | - Maria Pelidis
- Dept of Paediatric Haematology, Evelina London Children's Hospital, Guy's and St Thomas' NHS Trust, London, UK
| | - David Rees
- Dept of Paediatric Haematology, King's College Hospital, London, UK
| | - Baba P D Inusa
- Dept of Paediatric Haematology, Evelina London Children's Hospital, Guy's and St Thomas' NHS Trust, London, UK
| | - Atul Gupta
- Dept of Paediatric Respiratory Medicine, King's College Hospital, London, UK.,Institute for Women's and Children's Health, King's College London, London, UK
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13
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van Geyzel L, Arigliani M, Inusa B, Singh B, Kozlowska W, Chakravorty S, Bossley CJ, Ruiz G, Rees D, Gupta A. Higher oxygen saturation with hydroxyurea in paediatric sickle cell disease. Arch Dis Child 2020; 105:575-579. [PMID: 31871045 DOI: 10.1136/archdischild-2019-317862] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 11/11/2019] [Accepted: 12/05/2019] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Sickle cell disease (SCD) is one of the most common inherited diseases worldwide. It is associated with lifelong morbidity and reduced life expectancy. Hydroxyurea (HU) has been shown to reduce the frequency and severity of vaso-occlusive episodes in SCD. Hypoxaemia and intermittent nocturnal oxygen desaturations occur frequently in children with SCD and contribute to the associated morbidity, including risk of cerebrovascular disease. OBJECTIVE To evaluate the effect of HU on oxygen saturation (SpO2) overnight and on daytime SpO2 spot checks in children with SCD. METHODS A retrospective review of children with SCD and respiratory problems who attended two UK tertiary sickle respiratory clinics and were treated with HU. Longitudinal data were collected from 2 years prior and up to 3 years after the commencement of HU. RESULTS Forty-three children, 23 males (53%) with a median age of 9 (range 1.8-18) years were included. In the 21 children who had comparable sleep studies before and after starting HU, mean SpO2 was higher (95.2% from 93.5%, p=0.01) and nadir SpO2 was higher (87.2% from 84.3%, p=0.009) when taking HU. In 32 of the children, spot daytime oxygen saturations were also higher (96.3% from 93.5%, p=0.001). CONCLUSION Children with SCD had higher oxygen saturation overnight and on daytime spot checks after starting HU. These data suggest HU may be helpful for treating persistent hypoxaemia in children with SCD pending more evidence from a randomised clinical trial.
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Affiliation(s)
- Lisa van Geyzel
- Department of Paediatric Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Michele Arigliani
- Department of Medicine, Division of Pediatrics, University Hospital of Udine, Udine, Italy
| | - Baba Inusa
- Department of Paediatric Haematology, Guy's & St Thomas' NHS Foundation Trust, London, UK
| | - Bethany Singh
- Department of Paediatric Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Wanda Kozlowska
- Department of Paediatric Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK.,Department of Paediatric Respiratory Medicine, Addenbrooke's Hospital, Cambridge, Cambridgeshire, UK
| | - Subarna Chakravorty
- Department of Paediatric Haematology, King's College Hospital NHS Foundation Trust, London, UK
| | - Cara J Bossley
- Department of Paediatric Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - Gary Ruiz
- Department of Paediatric Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK
| | - David Rees
- Department of Paediatric Haematology, King's College Hospital NHS Foundation Trust, London, UK
| | - Atul Gupta
- Department of Paediatric Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, UK
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Roumenina LT, Chadebech P, Bodivit G, Vieira‐Martins P, Grunenwald A, Boudhabhay I, Poillerat V, Pakdaman S, Kiger L, Jouard A, Audureau E, Pirenne F, Galactéros F, Frémeaux‐Bacchi V, Bartolucci P. Complement activation in sickle cell disease: Dependence on cell density, hemolysis and modulation by hydroxyurea therapy. Am J Hematol 2020; 95:456-464. [PMID: 31990387 DOI: 10.1002/ajh.25742] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/14/2020] [Accepted: 01/21/2020] [Indexed: 12/15/2022]
Abstract
The complement system is an innate immune defense cascade that can cause tissue damage when inappropriately activated. Evidence for complement over activation has been reported in small cohorts of patients with sickle cell disease (SCD). However, the mechanism governing complement activation in SCD has not been elucidated. Here, we observe that the plasma concentration of sC5b-9, a reliable marker for terminal complement activation, is increased at steady state in 61% of untreated SCD patients. We show that greater complement activation in vitro is promoted by SCD erythrocytes compared to normal ones, although no significant differences were observed in the regulatory proteins CD35, CD55, and CD59 in whole blood. Complement activation is positively correlated with the percentage of dense sickle cells (DRBCs). The expression levels of CD35, CD55, and CD59 are reduced in DRBCs, suggesting inefficient regulation when cell density increases. Moreover, the surface expression of the complement regulator CD46 on granulocytes was inversely correlated with the plasma sC5b-9. We also show increased complement deposition in cultured human endothelial cells incubated with SCD serum, which is diminished by the addition of the heme scavenger hemopexin. Treatment of SCD patients with hydroxyurea produces substantial reductions in complement activation, measured by sC5b-9 concentration and upregulation of CD46, as well as decreased complement activation on RBCs in vitro. In conclusion, complement over activation is a common pathogenic event in SCD that is associated with formation of DRBCs and hemolysis. And, it affects red cells, leukocytes and endothelial cells. This complement over activation is partly alleviated by hydroxyurea therapy.
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Affiliation(s)
- Lubka T. Roumenina
- Centre de Recherche des CordeliersINSERM, Sorbonne Université, Université de Paris Paris France
| | - Philippe Chadebech
- Etablissement Français du SangIle‐de‐France, Hôpital Henri‐Mondor, AP‐HP Créteil France
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
| | - Gwellaouen Bodivit
- Etablissement Français du SangIle‐de‐France, Hôpital Henri‐Mondor, AP‐HP Créteil France
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
| | - Paula Vieira‐Martins
- Service d'Immunologie Biologique, Hôpital Européen Georges‐PompidouAssistance Publique—Hôpitaux de Paris, AP‐HP Paris France
| | - Anne Grunenwald
- Centre de Recherche des CordeliersINSERM, Sorbonne Université, Université de Paris Paris France
| | - Idris Boudhabhay
- Centre de Recherche des CordeliersINSERM, Sorbonne Université, Université de Paris Paris France
| | - Victoria Poillerat
- Centre de Recherche des CordeliersINSERM, Sorbonne Université, Université de Paris Paris France
| | - Sadaf Pakdaman
- Etablissement Français du SangIle‐de‐France, Hôpital Henri‐Mondor, AP‐HP Créteil France
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
| | - Laurent Kiger
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
| | - Alicia Jouard
- Etablissement Français du SangIle‐de‐France, Hôpital Henri‐Mondor, AP‐HP Créteil France
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
| | - Etienne Audureau
- Sickle Cell Referral Center, Service de Médecine InterneHôpital Henri‐Mondor, AP‐HP Créteil France
| | - France Pirenne
- Etablissement Français du SangIle‐de‐France, Hôpital Henri‐Mondor, AP‐HP Créteil France
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
| | - Frédéric Galactéros
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
- Service de Santé PubliqueHôpital Henri‐Mondor, AP‐HP Créteil France
| | - Véronique Frémeaux‐Bacchi
- Centre de Recherche des CordeliersINSERM, Sorbonne Université, Université de Paris Paris France
- Service d'Immunologie Biologique, Hôpital Européen Georges‐PompidouAssistance Publique—Hôpitaux de Paris, AP‐HP Paris France
| | - Pablo Bartolucci
- INSERM U955 équipe 2, Institut Mondor de Recherche Biomédicale (IMRB)Université Paris‐Est‐Créteil (UPEC), Créteil, France; and Laboratoire d'excellence GR‐Ex Paris France
- Service de Santé PubliqueHôpital Henri‐Mondor, AP‐HP Créteil France
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Lu M, Rab MA, Shevkoplyas SS, Sheehan VA. Blood rheology biomarkers in sickle cell disease. Exp Biol Med (Maywood) 2020; 245:155-165. [PMID: 31948290 DOI: 10.1177/1535370219900494] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Sickle cell disease (SCD) is the most common inherited blood disorder, affecting approximately 100,000 patients in the U.S. and millions more worldwide. Patients with SCD experience a wide range of clinical complications, including frequent pain crises, stroke, and early mortality, all originating from a single-point mutation in the β-globin subunit. The RBC changes resulting from the sickle mutation lead to a host of rheological abnormalities that diminish microvascular blood flow, and produce severe anemia due to RBC hemolysis, and ischemia from vaso-occlusion initiated by sticky, rigid sickle RBCs. While the pathophysiology and mechanisms of SCD have been investigated for many years, therapies to treat the disease are limited. In addition to RBC transfusion, there are only two US Food and Drug Administration (FDA)-approved drugs to ameliorate SCD complications: hydroxyurea (HU) and L-glutamine (Endari™). The only curative therapy currently available is allogeneic hematopoietic stem cell transplantation (HSCT), which is generally reserved for individuals with a matched related donor, comprising only 10–15% of the total SCD population. Potentially curative advanced gene therapy approaches for SCD are under investigation in ongoing clinical trials. The ultimate goal of any curative treatment should be to repair the hemorheological abnormalities caused by SCD, and thus normalize blood flow and prevent clinical complications. Our mini-review highlights a set of key hemorheological biomarkers (and the current and emerging technologies used to measure them) that may be used to guide the development of novel curative and palliative therapies for SCD, and functionally assess outcomes. Impact statement Severe impairment of blood rheology is the hallmark of SCD pathophysiology, and one of the key factors predisposing SCD patients to pain crises, organ damage, and early mortality. As novel therapies emerge to treat or cure SCD, it is crucial that these treatments are functionally evaluated for their effect on blood rheology. This review describes a comprehensive panel of rheological biomarkers, their clinical uses, and the technologies used to obtain them. The described technologies can produce highly sensitive measurements of the ability of current treatments to improve blood rheology of SCD patients. The goal of curative therapies should be to achieve blood rheology biomarkers measurements in the range of sickle cell trait individuals (HbAS). The use of the panel of rheological biomarkers proposed in this review could significantly accelerate the development, optimization, and clinical translation of novel therapies for SCD.
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Affiliation(s)
- Madeleine Lu
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
| | - Minke Ae Rab
- Laboratory of Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Utrecht 3584, The Netherlands
| | - Sergey S Shevkoplyas
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
| | - Vivien A Sheehan
- Department of Pediatrics, Division of Hematology/Oncology, Baylor College of Medicine, Houston, TX 77030, USA
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Garadah T, Mandeel F, Jaradat A, Bin Thani K. The Effects of Hydroxyurea Therapy on the Six-Minute Walk Distance in Patients with Adult Sickle Cell Anemia: An Echocardiographic Study. J Blood Med 2020; 10:443-452. [PMID: 31920416 PMCID: PMC6938284 DOI: 10.2147/jbm.s203828] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 10/16/2019] [Indexed: 12/29/2022] Open
Abstract
Background The impact of hydroxyurea (HU) medication as treatment of choice has not been evaluated in adult sickle cell anemia (SCA) patients in terms of the 6-min walk distance (6 MWD). Aim The aim of the study was evaluating the effects of HU on the 6 MWD, serum brain natriuretic peptide (NT-pro BNP) level, and pulmonary hypertension (PH) measured by tricuspid regurgitation velocity (TRV). Methods In this cross-sectional, prospective study, 110 patients with homozygous SCA were studied and compared with age- and gender-matched healthy controls. Every patient was investigated via pulsed and tissue Doppler echo evaluation, 6-min walk test (6 MWT), and blood level for the level of NT-pro-BNP hormone. Data were compared in patients with (n = 59; group 1, G1) and without (n = 51; group 2, G2) HU medication. Pearson correlation analysis was applied and clinical follow-up for the frequency of acute chest syndrome (ACS). Analysis of variance (ANOVA) multivariate statistical analysis was applied between groups. Results In the study, 110 patients with SCA were studied and compared with 110 control patients. Patients in G1 compared with G2 had a longer 6 MWD (491 ± 64.4 m vs 428.6 ± 54.3 m, p < 0.005), higher HbF% (21 ± 2.5% vs 8 ± 1.8%, p < 0.005), and lower NT-pro-BNP level (314.1 ± 27.5 pmol/L vs 407 ± 18.9 pmol/L, p = 0.05). The mean TRV values were 2.8 ± 0.5 m/s in G1 versus 3.4 ± 0.4 m/s in G2, p < 0.005, and 1.5 ± 0.7 m/s in the control group. The high probability of PH based on a TRV > 3.4 m/s was 10.1% in G1 versus 17.6% in G2 and 3.6% in the control. There were weak positive correlations between NT-pro-BNP and TRV (r = 0.264; p = 0.005) and HbF% and 6 MWD (r = 0.452; p = 0.001). After 12 months of follow-up, frequency of acute chest syndrome (ACS) was twice as high in G2, at 32 patients, versus 16 in G1. Conclusion Patients with SCA on HU medication compared with no HU had significantly longer 6 MWD, lower level of NT-pro-BNP, higher HbF% level. After 1-year follow-up HU patients had less frequency of ACS. There were significant positive correlations between the level of NT-pro BNP level and TRV in m/s on echo.
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Affiliation(s)
- Taysir Garadah
- Medical Department, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain.,Medical Department, Cardiac Unit, Salmanyia Medical Complex, Manama, Kingdom of Bahrain
| | - Fatema Mandeel
- Medical Department, Cardiac Unit, Salmanyia Medical Complex, Manama, Kingdom of Bahrain
| | - Ahmed Jaradat
- Medical Department, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain
| | - Khalid Bin Thani
- Medical Department, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain.,Medical Department, Cardiac Unit, Salmanyia Medical Complex, Manama, Kingdom of Bahrain
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17
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Cazenave M, Audard V, Bertocchio JP, Habibi A, Baron S, Prot-Bertoye C, Berkenou J, Maruani G, Stehlé T, Cornière N, Ayari H, Friedlander G, Galacteros F, Houillier P, Bartolucci P, Courbebaisse M. Tubular Acidification Defect in Adults with Sickle Cell Disease. Clin J Am Soc Nephrol 2020; 15:16-24. [PMID: 31822527 PMCID: PMC6946065 DOI: 10.2215/cjn.07830719] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 10/29/2019] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND OBJECTIVES Metabolic acidosis is a frequent manifestation of sickle cell disease but the mechanisms and determinants of this disorder are unknown. Our aim was to characterize urinary acidification capacity in adults with sickle cell disease and to identify potential factors associated with decreased capacity to acidify urine. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Among 25 adults with sickle cell disease and an eGFR of ≥60 ml/min per 1.73 m2 from a single center in France, we performed an acute acidification test after simultaneous administration of furosemide and fludrocortisone. A normal response was defined as a decrease in urinary pH <5.3 and an increase in urinary ammonium excretion ≥33 µEq/min at one or more of the six time points after furosemide and fludrocortisone administration. RESULTS Of the participants (median [interquartile range] age of 36 [24-43] years old, 17 women), 12 had a normal and 13 had an abnormal response to the test. Among these 13 participants, nine had normal baseline plasma bicarbonate concentration. Plasma aldosterone was within the normal range for all 13 participants with an abnormal response, making the diagnosis of type 4 tubular acidosis unlikely. The participants with an abnormal response to the test were significantly older, more frequently treated with oral bicarbonate, had a higher plasma uric acid concentration, higher hemolysis activity, lower eGFR, lower baseline plasma bicarbonate concentration, higher urine pH, lower urine ammonium ion excretion, and lower fasting urine osmolality than those with a normal response. Considering both groups, the maximum urinary ammonium ion excretion was positively correlated with fasting urine osmolality (r 2=0.34, P=0.002), suggesting that participants with sickle cell disease and lower urine concentration capacity have lower urine acidification capacity. CONCLUSIONS Among adults with sickle cell disease, impaired urinary acidification capacity attributable to distal tubular dysfunction is common and associated with the severity of hyposthenuria. PODCAST This article contains a podcast at https://www.asn-online.org/media/podcast/CJASN/2019_12_10_CJN07830719.mp3.
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Affiliation(s)
- Maud Cazenave
- Nephrology and Renal Transplantation Department, Pitié-Salpetrière Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), Sorbonne University, Paris, France
| | - Vincent Audard
- Nephrology and Renal Transplantation Department, Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Henri Mondor Hospital, AP-HP, Paris Est Créteil University, Créteil, France
| | - Jean-Philippe Bertocchio
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, INSERM U1138, Centre National de la Recherche Scientifique (CNRS) ERL8228, Paris, France
| | - Anoosha Habibi
- Sickle Cell Referral Center, Internal Medicine Unit, IMRB team 2, UPEC, Labex GRex, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Stéphanie Baron
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, INSERM U1138, Centre National de la Recherche Scientifique (CNRS) ERL8228, Paris, France
| | - Caroline Prot-Bertoye
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, INSERM U1138, Centre National de la Recherche Scientifique (CNRS) ERL8228, Paris, France
| | - Jugurtha Berkenou
- Sickle Cell Referral Center, Internal Medicine Unit, IMRB team 2, UPEC, Labex GRex, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Gérard Maruani
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, Necker-Enfants Malades Institute, INSERM U1151-CNRS UMR8253, Paris, France; and
| | - Thomas Stehlé
- Nephrology and Renal Transplantation Department, Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Henri Mondor Hospital, AP-HP, Paris Est Créteil University, Créteil, France
| | - Nicolas Cornière
- Nephrology Department, Felix Guyon Hospital, Saint-Denis, Réunion Island, France
| | - Hamza Ayari
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, INSERM U1138, Centre National de la Recherche Scientifique (CNRS) ERL8228, Paris, France
| | - Gérard Friedlander
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, Necker-Enfants Malades Institute, INSERM U1151-CNRS UMR8253, Paris, France; and
| | - Frédéric Galacteros
- Sickle Cell Referral Center, Internal Medicine Unit, IMRB team 2, UPEC, Labex GRex, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Pascal Houillier
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, INSERM U1138, Centre National de la Recherche Scientifique (CNRS) ERL8228, Paris, France
| | - Pablo Bartolucci
- Sickle Cell Referral Center, Internal Medicine Unit, IMRB team 2, UPEC, Labex GRex, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Marie Courbebaisse
- Physiology Department, European Georges Pompidou University Hospital, AP-HP, Paris Descartes University, Necker-Enfants Malades Institute, INSERM U1151-CNRS UMR8253, Paris, France; and
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18
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Stotesbury H, Kawadler JM, Hales PW, Saunders DE, Clark CA, Kirkham FJ. Vascular Instability and Neurological Morbidity in Sickle Cell Disease: An Integrative Framework. Front Neurol 2019; 10:871. [PMID: 31474929 PMCID: PMC6705232 DOI: 10.3389/fneur.2019.00871] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 07/26/2019] [Indexed: 12/20/2022] Open
Abstract
It is well-established that patients with sickle cell disease (SCD) are at substantial risk of neurological complications, including overt and silent stroke, microstructural injury, and cognitive difficulties. Yet the underlying mechanisms remain poorly understood, partly because findings have largely been considered in isolation. Here, we review mechanistic pathways for which there is accumulating evidence and propose an integrative systems-biology framework for understanding neurological risk. Drawing upon work from other vascular beds in SCD, as well as the wider stroke literature, we propose that macro-circulatory hyper-perfusion, regions of relative micro-circulatory hypo-perfusion, and an exhaustion of cerebral reserve mechanisms, together lead to a state of cerebral vascular instability. We suggest that in this state, tissue oxygen supply is fragile and easily perturbed by changes in clinical condition, with the potential for stroke and/or microstructural injury if metabolic demand exceeds tissue oxygenation. This framework brings together recent developments in the field, highlights outstanding questions, and offers a first step toward a linking pathophysiological explanation of neurological risk that may help inform future screening and treatment strategies.
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Affiliation(s)
- Hanne Stotesbury
- Developmental Neurosciences, UCL Great Ormond Institute of Child Health, London, United Kingdom
| | - Jamie M Kawadler
- Developmental Neurosciences, UCL Great Ormond Institute of Child Health, London, United Kingdom
| | - Patrick W Hales
- Developmental Neurosciences, UCL Great Ormond Institute of Child Health, London, United Kingdom
| | - Dawn E Saunders
- Developmental Neurosciences, UCL Great Ormond Institute of Child Health, London, United Kingdom.,Department of Radiology, Great Ormond Hospital, London, United Kingdom
| | - Christopher A Clark
- Developmental Neurosciences, UCL Great Ormond Institute of Child Health, London, United Kingdom
| | - Fenella J Kirkham
- Developmental Neurosciences, UCL Great Ormond Institute of Child Health, London, United Kingdom.,Clinical and Experimental Sciences, University of Southampton, Southampton, United Kingdom.,Department of Child Health, University Hospital Southampton, Southampton, United Kingdom.,Department of Paediatric Neurology, Kings College Hospital NHS Foundation Trust, London, United Kingdom
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19
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Meng Q, Peng X, Zhao S, Xu T, Wang S, Liu Q, Cai R, Fan Y. Hypoxic storage of erythrocytes slows down storage lesions and prolongs shelf-life. J Cell Physiol 2019; 234:22833-22844. [PMID: 31264213 DOI: 10.1002/jcp.28847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 05/03/2019] [Indexed: 01/28/2023]
Abstract
Conventional storage conditions of erythrocytes cause storage lesions. We propose that hypoxic storage conditions, involving removal of oxygen and replacement with helium, the changes in stored erythrocytes under hypoxic condition were observed and assessed. Erythrocytes were divided into two equal parts, then stored in conventional and hypoxic conditions, separately. Blood gas analysis, hemorheology, and hemolysis were performed once a week. Energy metabolism and membrane damage were monitored by enzyme-linked immunosorbent assay. Phosphatidylserine exposure was measured by flow cytometry. P50 was measured and the oxygen dissociation curve (ODC) plotted accordingly. Erythrocyte morphology was observed microscopically. In the 9th week of storage, the hemolysis of the hypoxia group was 0.7%; lower (p < .05) than that of the control group and still below the threshold of quality requirements. The dissolved oxygen and pO2 were only 1/4 of that in the control group (p < .01); the adenosine triphosphate, glucose, and lactic acid levels were decreased (p < .05), while the 2,3-diphosphoglycerate levels were increased relative to that in the control group (p < .01). There were no statistically significant differences in membrane damage, deformability, and aggregation between the two groups. In addition, the ODC of the two groups was shifted to the left but this difference was not statistically different. Basically similar to the effect of completely anaerobic conditions. Erythrocytes stored under hypoxic conditions could maintain a relatively stable state with a significant decrease in hemolysis, reduction of storage lesions, and an increase in shelf-life.
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Affiliation(s)
- Qiang Meng
- Department of Transfusion Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.,Department of Laboratory Medicine and Blood Transfusion, Guiqian International General Hospital, Guiyang, China
| | - Xiaowu Peng
- Department of Laboratory Medicine, Wulongbei Healing Area of Dalian Rehabilitation Center, Dandong, China
| | - Shuming Zhao
- Department of Laboratory Medicine and Blood Transfusion, Guiqian International General Hospital, Guiyang, China
| | - Ting Xu
- Department of Transfusion Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Shichun Wang
- Department of Transfusion Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Qi Liu
- Department of Transfusion Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Ruili Cai
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Yahan Fan
- Department of Transfusion Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China
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20
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Detterich JA. Simple chronic transfusion therapy, a crucial therapeutic option for sickle cell disease, improves but does not normalize blood rheology: What should be our goals for transfusion therapy? Clin Hemorheol Microcirc 2018; 68:173-186. [PMID: 29614631 DOI: 10.3233/ch-189006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Sickle cell anemia is characterized by a mutation resulting in the formation of an abnormal beta-hemoglobin called hemoglobin S. Hemoglobin S polymerizes upon deoxygenation, causing impaired red blood cell deformability and increased blood viscosity at equivalent hematocrits. Thus, sickle cell disease is a hemorheologic disease that results in various pathologic processes involving multiple organ systems including the lungs, heart, kidneys and brain. Red blood cell mechanics and the perturbations on blood flow-endothelial interaction underlie much of the pathology found in sickle cell disease. Transfusion therapy is one of the few therapeutic options available to patients, acting as both primary and secondary prevention of stroke. Transfusion therapy, both simple and exchange, is also used for unremitting and frequent pain crises and pulmonary hypertension. Therefore, understanding basic rheologic changes following transfusion inform other therapeutic options that aim to mitigate this diffuse pathologic process. This review will aim to highlight transfusion effects on blood rheology.
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Affiliation(s)
- Jon A Detterich
- Division of Cardiology, Children's Hospital Los Angeles, University of Southern California Keck School of Medicine, Los Angeles, CA, USA.,Department of Biophysics and Physiology, University of Southern California Keck School of Medicine, Los Angeles, CA, USA
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21
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Abstract
Cell dehydration is a distinguishing characteristic of sickle cell disease and an important contributor to disease pathophysiology. Due to the unique dependence of Hb S polymerization on cellular Hb S concentration, cell dehydration promotes polymerization and sickling. In double heterozygosis for Hb S and C (SC disease) dehydration is the determining factor in disease pathophysiology. Three major ion transport pathways are involved in sickle cell dehydration: the K-Cl cotransport (KCC), the Gardos channel (KCNN4) and Psickle, the polymerization induced membrane permeability, most likely mediated by the mechano-sensitive ion channel PIEZO1. Each of these pathways exhibit unique characteristics in regulation by oxygen tension, intracellular and extracellular environment, and functional expression in reticulocytes and mature red cells. The unique dependence of K-Cl cotransport on intracellular Mg and the abnormal reduction of erythrocyte Mg content in SS and SC cells had led to clinical studies assessing the effect of oral Mg supplementation. Inhibition of Gardos channel by clotrimazole and senicapoc has led to Phase 1,2,3 trials in patients with sickle cell disease. While none of these studies has resulted in the approval of a novel therapy for SS disease, they have highlighted the key role played by these pathways in disease pathophysiology.
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Affiliation(s)
- Carlo Brugnara
- Department of Laboratory Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
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22
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Lopes AJ, Marinho CL, Alves UD, Gonçalves CEA, Silva PO, Botelho EC, Bedirian R, Soares AR, Maioli MCP. Relationship between ventilation heterogeneity and exercise intolerance in adults with sickle cell anemia. ACTA ACUST UNITED AC 2017; 50:e6512. [PMID: 28746470 PMCID: PMC5520223 DOI: 10.1590/1414-431x20176512] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 06/09/2017] [Indexed: 12/18/2022]
Abstract
Sickle cell anemia (SCA) causes dysfunction of multiple organs, with pulmonary involvement as a major cause of mortality. Recently, there has been growing interest in the nitrogen single-breath washout (N2SBW) test, which is able to detect ventilation heterogeneity and small airway disease when the results of other pulmonary function tests (PFTs) are still normal. Thus, the objectives of the present study were to assess the heterogeneity in the ventilation distribution in adults with SCA and to determine the association between the ventilation distribution and the clinical, cardiovascular, and radiological findings. This cross-sectional study included 38 adults with SCA who underwent PFTs, echocardiography, computed tomography (CT), and 6-min walk test. To evaluate the ventilation heterogeneity, the patients were categorized according to the phase III slope of the N2SBW (SIIIN2). Compared with adults with lower SIIIN2 values, adults with higher SIIIN2 values showed lower hemoglobin levels (P=0.048), a history of acute chest syndrome (P=0.001), an elevated tricuspid regurgitation velocity (P=0.039), predominance of a reticular pattern in the CT (P=0.002), a shorter 6-min walking distance (6MWD) (P=0.002), and lower peripheral oxygen saturation (SpO2) after exercise (P=0.03). SIIIN2 values correlated significantly with hemoglobin (rs=-0.344; P=0.034), forced vital capacity (rs=-0.671; P<0.0001), diffusing capacity for carbon monoxide (rs=-0.376; P=0.019), 6MWD (rs=-0.554; P=0.0003), and SpO2 after exercise (P=0.040). Heterogeneity in the ventilation distribution is one of the most common pulmonary dysfunctions in adults with SCA. Moreover, relationships exist between ventilation heterogeneity, worsening of pulmonary structural damage, and reduced tolerance for exercise.
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Affiliation(s)
- A J Lopes
- Programa de Pós-Graduação em Ciências da Reabilitação, Centro Universitário Augusto Motta, Rio de Janeiro, RJ, Brasil.,Programa de Pós-Graduação em Ciências Médicas, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - C L Marinho
- Programa de Pós-Graduação em Fisiopatologia Clínica e Experimental, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - U D Alves
- Programa de Pós-Graduação em Ciências Médicas, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - C E A Gonçalves
- Programa de Pós-Graduação em Ciências da Reabilitação, Centro Universitário Augusto Motta, Rio de Janeiro, RJ, Brasil
| | - P O Silva
- Programa de Pós-Graduação em Ciências da Reabilitação, Centro Universitário Augusto Motta, Rio de Janeiro, RJ, Brasil
| | - E C Botelho
- Programa de Pós-Graduação em Ciências Médicas, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - R Bedirian
- Disciplina de Clínica Médica, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - A R Soares
- Programa de Pós-Graduação em Ciências Médicas, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.,Disciplina de Hematologia e Hemoterapia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - M C P Maioli
- Programa de Pós-Graduação em Ciências Médicas, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.,Disciplina de Hematologia e Hemoterapia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
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