1
|
Cilek N, Ugurel E, Goksel E, Yalcin O. Signaling mechanisms in red blood cells: A view through the protein phosphorylation and deformability. J Cell Physiol 2024; 239:e30958. [PMID: 36748950 DOI: 10.1002/jcp.30958] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 01/07/2023] [Accepted: 01/19/2023] [Indexed: 02/08/2023]
Abstract
Intracellular signaling mechanisms in red blood cells (RBCs) involve various protein kinases and phosphatases and enable rapid adaptive responses to hypoxia, metabolic requirements, oxidative stress, or shear stress by regulating the physiological properties of the cell. Protein phosphorylation is a ubiquitous mechanism for intracellular signal transduction, volume regulation, and cytoskeletal organization in RBCs. Spectrin-based cytoskeleton connects integral membrane proteins, band 3 and glycophorin C to junctional proteins, ankyrin and Protein 4.1. Phosphorylation leads to a conformational change in the protein structure, weakening the interactions between proteins in the cytoskeletal network that confers a more flexible nature for the RBC membrane. The structural organization of the membrane and the cytoskeleton determines RBC deformability that allows cells to change their ability to deform under shear stress to pass through narrow capillaries. The shear stress sensing mechanisms and oxygenation-deoxygenation transitions regulate cell volume and mechanical properties of the membrane through the activation of ion transporters and specific phosphorylation events mediated by signal transduction. In this review, we summarize the roles of Protein kinase C, cAMP-Protein kinase A, cGMP-nitric oxide, RhoGTPase, and MAP/ERK pathways in the modulation of RBC deformability in both healthy and disease states. We emphasize that targeting signaling elements may be a therapeutic strategy for the treatment of hemoglobinopathies or channelopathies. We expect the present review will provide additional insights into RBC responses to shear stress and hypoxia via signaling mechanisms and shed light on the current and novel treatment options for pathophysiological conditions.
Collapse
Affiliation(s)
- Neslihan Cilek
- Research Center for Translational Medicine (KUTTAM), Koc University, Istanbul, Turkey
- School of Medicine, Koc University, Istanbul, Turkey
- Graduate School of Health Sciences, Koc University, Istanbul, Turkey
| | - Elif Ugurel
- Research Center for Translational Medicine (KUTTAM), Koc University, Istanbul, Turkey
- School of Medicine, Koc University, Istanbul, Turkey
| | - Evrim Goksel
- Research Center for Translational Medicine (KUTTAM), Koc University, Istanbul, Turkey
- School of Medicine, Koc University, Istanbul, Turkey
- Graduate School of Health Sciences, Koc University, Istanbul, Turkey
| | - Ozlem Yalcin
- Research Center for Translational Medicine (KUTTAM), Koc University, Istanbul, Turkey
- School of Medicine, Koc University, Istanbul, Turkey
| |
Collapse
|
2
|
Petkova-Kirova P, Murciano N, Iacono G, Jansen J, Simionato G, Qiao M, Van der Zwaan C, Rotordam MG, John T, Hertz L, Hoogendijk AJ, Becker N, Wagner C, Von Lindern M, Egee S, Van den Akker E, Kaestner L. The Gárdos Channel and Piezo1 Revisited: Comparison between Reticulocytes and Mature Red Blood Cells. Int J Mol Sci 2024; 25:1416. [PMID: 38338693 PMCID: PMC10855361 DOI: 10.3390/ijms25031416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/28/2023] [Accepted: 01/03/2024] [Indexed: 02/12/2024] Open
Abstract
The Gárdos channel (KCNN4) and Piezo1 are the best-known ion channels in the red blood cell (RBC) membrane. Nevertheless, the quantitative electrophysiological behavior of RBCs and its heterogeneity are still not completely understood. Here, we use state-of-the-art biochemical methods to probe for the abundance of the channels in RBCs. Furthermore, we utilize automated patch clamp, based on planar chips, to compare the activity of the two channels in reticulocytes and mature RBCs. In addition to this characterization, we performed membrane potential measurements to demonstrate the effect of channel activity and interplay on the RBC properties. Both the Gárdos channel and Piezo1, albeit their average copy number of activatable channels per cell is in the single-digit range, can be detected through transcriptome analysis of reticulocytes. Proteomics analysis of reticulocytes and mature RBCs could only detect Piezo1 but not the Gárdos channel. Furthermore, they can be reliably measured in the whole-cell configuration of the patch clamp method. While for the Gárdos channel, the activity in terms of ion currents is higher in reticulocytes compared to mature RBCs, for Piezo1, the tendency is the opposite. While the interplay between Piezo1 and Gárdos channel cannot be followed using the patch clamp measurements, it could be proved based on membrane potential measurements in populations of intact RBCs. We discuss the Gárdos channel and Piezo1 abundance, interdependencies and interactions in the context of their proposed physiological and pathophysiological functions, which are the passing of small constrictions, e.g., in the spleen, and their active participation in blood clot formation and thrombosis.
Collapse
Affiliation(s)
- Polina Petkova-Kirova
- Institute of Neurobiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;
- Department of Biochemistry, Saarland University, 66123 Saarbrücken, Germany
| | - Nicoletta Murciano
- Nanion Technologies, 80339 Munich, Germany; (N.M.); (M.G.R.); (N.B.)
- Theoretical Medicine and Biosciences, Campus University Hospital, Saarland University, 66421 Homburg, Germany; (J.J.); (M.Q.); (L.H.)
| | - Giulia Iacono
- Department of Hematopoiesis, Sanquin Research, 1066 CX Amsterdam, The Netherlands; (G.I.); (C.V.d.Z.); (A.J.H.); (M.V.L.); (E.V.d.A.)
- Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, 1007 MB Amsterdam, The Netherlands
| | - Julia Jansen
- Theoretical Medicine and Biosciences, Campus University Hospital, Saarland University, 66421 Homburg, Germany; (J.J.); (M.Q.); (L.H.)
- Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany (T.J.); (C.W.)
| | - Greta Simionato
- Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany (T.J.); (C.W.)
- Department of Experimental Surgery, Campus University Hospital, Saarland University, 66421 Homburg, Germany
| | - Min Qiao
- Theoretical Medicine and Biosciences, Campus University Hospital, Saarland University, 66421 Homburg, Germany; (J.J.); (M.Q.); (L.H.)
- Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany (T.J.); (C.W.)
| | - Carmen Van der Zwaan
- Department of Hematopoiesis, Sanquin Research, 1066 CX Amsterdam, The Netherlands; (G.I.); (C.V.d.Z.); (A.J.H.); (M.V.L.); (E.V.d.A.)
- Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, 1007 MB Amsterdam, The Netherlands
| | | | - Thomas John
- Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany (T.J.); (C.W.)
| | - Laura Hertz
- Theoretical Medicine and Biosciences, Campus University Hospital, Saarland University, 66421 Homburg, Germany; (J.J.); (M.Q.); (L.H.)
- Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany (T.J.); (C.W.)
| | - Arjan J. Hoogendijk
- Department of Hematopoiesis, Sanquin Research, 1066 CX Amsterdam, The Netherlands; (G.I.); (C.V.d.Z.); (A.J.H.); (M.V.L.); (E.V.d.A.)
- Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, 1007 MB Amsterdam, The Netherlands
| | - Nadine Becker
- Nanion Technologies, 80339 Munich, Germany; (N.M.); (M.G.R.); (N.B.)
| | - Christian Wagner
- Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany (T.J.); (C.W.)
- Physics and Materials Science Research Unit, University of Luxembourg, L-1511 Luxembourg, Luxembourg
| | - Marieke Von Lindern
- Department of Hematopoiesis, Sanquin Research, 1066 CX Amsterdam, The Netherlands; (G.I.); (C.V.d.Z.); (A.J.H.); (M.V.L.); (E.V.d.A.)
- Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, 1007 MB Amsterdam, The Netherlands
| | - Stephane Egee
- Biological Station Roscoff, Sorbonne University, CNRS, UMR8227 LBI2M, F-29680 Roscoff, France;
- Laboratory of Excellence GR-Ex, F-75015 Paris, France
| | - Emile Van den Akker
- Department of Hematopoiesis, Sanquin Research, 1066 CX Amsterdam, The Netherlands; (G.I.); (C.V.d.Z.); (A.J.H.); (M.V.L.); (E.V.d.A.)
- Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, 1007 MB Amsterdam, The Netherlands
| | - Lars Kaestner
- Theoretical Medicine and Biosciences, Campus University Hospital, Saarland University, 66421 Homburg, Germany; (J.J.); (M.Q.); (L.H.)
- Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany (T.J.); (C.W.)
| |
Collapse
|
3
|
Allegrini B, NGuyen LD, Mignotet M, Etchebest C, Fenneteau O, Platon J, Lambilliotte A, Guizouarn H, Da Costa L. Next generation sequencing (NGS) interest in deciphering erythrocyte molecular defects' association in red cell disorders: Clinical and erythrocyte phenotypes of patients with mutations inheritance in PIEZO1, Spectrin ß1, RhAG and SLC4A1. Blood Cells Mol Dis 2023; 103:102780. [PMID: 37516005 DOI: 10.1016/j.bcmd.2023.102780] [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: 04/24/2023] [Revised: 07/06/2023] [Accepted: 07/13/2023] [Indexed: 07/31/2023]
Abstract
We report here an instructive case referred at 16 months-old for exploration of hemolysis without anemia (compensated anemia with reticulocytosis). The biology tests confirmed the hemolysis with increased total and indirect bilirubin. The usual hemolysis diagnosis tests were normal (DAT, G6PD, PK, Hb electrophoresis) except cytology and ektacytometry suggesting an association of multiple red blood cell (RBC) membrane disorders. This led us to propose a molecular screening analysis using targeted-Next Generation Sequencing (t-NGS) with a capture technique on 93 genes involved in RBC and erythropoiesis defects. We identified 4 missense heterozygous allelic variations, all of them were described without any significance (VUS) in the SLC4A1, RhAG, PIEZO1 and SPTB genes. The study of the familial cosegregation and research functional tests allowed to decipher the role of at least two by two genes in the phenotype and the hemolytic disease of this young patient. Specialized t-NGS panel (or virtual exome/genome sequencing) in a disease-referent laboratory and the motivated collaboration of clinicians, biologists and scientists should be the gold standard for improving the diagnosis of the patients affected with RBC diseases or rare inherited anemias.
Collapse
Affiliation(s)
- Benoit Allegrini
- Université Côte d'Azur, CNRS, Inserm, Institut Biologie Valrose, Nice, France
| | | | - Morgane Mignotet
- Université Côte d'Azur, CNRS, Inserm, Institut Biologie Valrose, Nice, France
| | - Catherine Etchebest
- Inserm U1134, France; Laboratory of Excellence for RBCs, LABEX GR-Ex, 75015 Paris, France
| | - Odile Fenneteau
- AP-HP, Service Hématologie Biologique, Hôpital R. Debré, Paris, France
| | - Jessica Platon
- HEMATIM EA4666, Université Picardie Jules Vernes, Amiens, France
| | | | - Hélène Guizouarn
- Université Côte d'Azur, CNRS, Inserm, Institut Biologie Valrose, Nice, France; Laboratory of Excellence for RBCs, LABEX GR-Ex, 75015 Paris, France.
| | - Lydie Da Costa
- AP-HP, Service Hématologie Biologique, Hôpital R. Debré, Paris, France; HEMATIM EA4666, Université Picardie Jules Vernes, Amiens, France; Université Paris, Paris, France; Inserm U1134, France
| |
Collapse
|
4
|
Juvenile Hemochromatosis With Non-transfused Hemolytic Anemia Caused by a De Novo PIEZO1 Gene Mutation. J Pediatr Hematol Oncol 2023; 45:e510-e513. [PMID: 36898020 DOI: 10.1097/mph.0000000000002639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 01/10/2023] [Indexed: 03/12/2023]
Abstract
Differential diagnosis of juvenile hemochromatosis along with hemolytic anemia is often difficult. We report a 23-year-old woman with macrocytic hemolytic anemia with iron overload. The patient showed high serum ferritin and transferrin saturation and low serum transferrin and ceruloplasmin. We also noticed stomatocytes in her blood smear, which was confirmed by scanning electron microscopy. Target gene sequencing identified a mutation in PIEZO1 (heterozygous c.6008C>A: p.A2003D). This mutation was reported previously in a family with dehydrated hereditary stomatocytosis (DHS1, [OMIM 194380]), but in the current case, it was identified to be a de novo mutation. We underscore DHS1 in the differential diagnosis of iron overload associated with non-transfused hemolytic anemia in children and young adults.
Collapse
|
5
|
Lew VL. The circulatory dynamics of human red blood cell homeostasis: Oxy-deoxy and PIEZO1-triggered changes. Biophys J 2023; 122:484-495. [PMID: 36588342 PMCID: PMC9941722 DOI: 10.1016/j.bpj.2022.12.038] [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: 08/16/2022] [Revised: 11/14/2022] [Accepted: 12/30/2022] [Indexed: 01/02/2023] Open
Abstract
The vital function of red blood cells (RBCs) is to mediate the transport of oxygen from lungs to tissues and of CO2 from tissues to lungs. The gas exchanges occur during capillary transits within fractions of a second. Each oxygenation-deoxygenation and deoxygenation-reoxygenation transition on hemoglobin triggers sharp changes in RBC pH, leading to downstream changes in ion fluxes, membrane potential, and cell volume. The dynamics of these changes during the variable periods between capillary transits in vivo remains a mystery inaccessible to study by current methodologies, a knowledge gap on a fundamental physiological process that is the focus of the present study. The use of a computational model of human RBC homeostasis of tested accreditation enabled a detailed investigation of the expected RBC changes during intercapillary transits, with results advancing novel insights and predictions. The predicted rates of relative RBC volume change on oxygenation-deoxygenation (oxy-deoxy) and deoxygenation-reoxygenation transitions were about 1.5%/min and -0.9%/min, respectively, far too slow to allow the cells to reach steady states in the intervals between capillary transits. The amplitude of the oxy-deoxy-reoxygenation volume fluctuations varied in proportion with the duration of the intercapillary transit intervals. Upon capillary entry, oxy-deoxy-induced changes occur concurrently with deformation-induced PIEZO1 channel activation, both processes affecting cell pH, membrane potential, and cell volume during intertransit periods. The model showed that the effects were strictly additive as expected from processes operating independently on the cell's homeostatic fabric. Analysis of the mechanisms behind these predictions revealed, for the first time, the complex interactions between oxy-deoxy and ion transport processes that ensure the long-term homeostatic stability of RBCs for optimal gas transport in physiological conditions and how these may become altered in diseased states. Possible designs of microfluidic devices to test the model predictions are discussed.
Collapse
Affiliation(s)
- Virgilio L Lew
- Physiological Laboratory, Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Site, Cambridge, United Kingdom.
| |
Collapse
|
6
|
Nam YW, Downey M, Rahman MA, Cui M, Zhang M. Channelopathy of small- and intermediate-conductance Ca 2+-activated K + channels. Acta Pharmacol Sin 2023; 44:259-267. [PMID: 35715699 PMCID: PMC9889811 DOI: 10.1038/s41401-022-00935-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 05/31/2022] [Indexed: 02/04/2023] Open
Abstract
Small- and intermediate-conductance Ca2+-activated K+ (KCa2.x/KCa3.1 also called SK/IK) channels are gated exclusively by intracellular Ca2+. The Ca2+ binding protein calmodulin confers sub-micromolar Ca2+ sensitivity to the channel-calmodulin complex. The calmodulin C-lobe is constitutively associated with the proximal C-terminus of the channel. Interactions between calmodulin N-lobe and the channel S4-S5 linker are Ca2+-dependent, which subsequently trigger conformational changes in the channel pore and open the gate. KCNN genes encode four subtypes, including KCNN1 for KCa2.1 (SK1), KCNN2 for KCa2.2 (SK2), KCNN3 for KCa2.3 (SK3), and KCNN4 for KCa3.1 (IK). The three KCa2.x channel subtypes are expressed in the central nervous system and the heart. The KCa3.1 subtype is expressed in the erythrocytes and the lymphocytes, among other peripheral tissues. The impact of dysfunctional KCa2.x/KCa3.1 channels on human health has not been well documented. Human loss-of-function KCa2.2 mutations have been linked with neurodevelopmental disorders. Human gain-of-function mutations that increase the apparent Ca2+ sensitivity of KCa2.3 and KCa3.1 channels have been associated with Zimmermann-Laband syndrome and hereditary xerocytosis, respectively. This review article discusses the physiological significance of KCa2.x/KCa3.1 channels, the pathophysiology of the diseases linked with KCa2.x/KCa3.1 mutations, the structure-function relationship of the mutant KCa2.x/KCa3.1 channels, and potential pharmacological therapeutics for the KCa2.x/KCa3.1 channelopathy.
Collapse
Affiliation(s)
- Young-Woo Nam
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy, Irvine, CA, 92618, USA
| | - Myles Downey
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy, Irvine, CA, 92618, USA
| | - Mohammad Asikur Rahman
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy, Irvine, CA, 92618, USA
| | - Meng Cui
- Department of Pharmaceutical Sciences, Northeastern University School of Pharmacy, Boston, MA, 02115, USA
| | - Miao Zhang
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy, Irvine, CA, 92618, USA.
| |
Collapse
|
7
|
Ca 2+-Sensitive Potassium Channels. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020885. [PMID: 36677942 PMCID: PMC9861210 DOI: 10.3390/molecules28020885] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/07/2023] [Accepted: 01/10/2023] [Indexed: 01/18/2023]
Abstract
The Ca2+ ion is used ubiquitously as an intracellular signaling molecule due to its high external and low internal concentration. Many Ca2+-sensing ion channel proteins have evolved to receive and propagate Ca2+ signals. Among them are the Ca2+-activated potassium channels, a large family of potassium channels activated by rises in cytosolic calcium in response to Ca2+ influx via Ca2+-permeable channels that open during the action potential or Ca2+ release from the endoplasmic reticulum. The Ca2+ sensitivity of these channels allows internal Ca2+ to regulate the electrical activity of the cell membrane. Activating these potassium channels controls many physiological processes, from the firing properties of neurons to the control of transmitter release. This review will discuss what is understood about the Ca2+ sensitivity of the two best-studied groups of Ca2+-sensitive potassium channels: large-conductance Ca2+-activated K+ channels, KCa1.1, and small/intermediate-conductance Ca2+-activated K+ channels, KCa2.x/KCa3.1.
Collapse
|
8
|
Zahra A, Liu R, Han W, Meng H, Wang Q, Wang Y, Campbell SL, Wu J. K Ca-Related Neurological Disorders: Phenotypic Spectrum and Therapeutic Indications. Curr Neuropharmacol 2023; 21:1504-1518. [PMID: 36503451 PMCID: PMC10472807 DOI: 10.2174/1570159x21666221208091805] [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: 04/21/2022] [Revised: 07/21/2022] [Accepted: 07/23/2022] [Indexed: 12/14/2022] Open
Abstract
Although potassium channelopathies have been linked to a wide range of neurological conditions, the underlying pathogenic mechanism is not always clear, and a systematic summary of clinical manifestation is absent. Several neurological disorders have been associated with alterations of calcium-activated potassium channels (KCa channels), such as loss- or gain-of-function mutations, post-transcriptional modification, etc. Here, we outlined the current understanding of the molecular and cellular properties of three subtypes of KCa channels, including big conductance KCa channels (BK), small conductance KCa channels (SK), and the intermediate conductance KCa channels (IK). Next, we comprehensively reviewed the loss- or gain-of-function mutations of each KCa channel and described the corresponding mutation sites in specific diseases to broaden the phenotypic-genotypic spectrum of KCa-related neurological disorders. Moreover, we reviewed the current pharmaceutical strategies targeting KCa channels in KCa-related neurological disorders to provide new directions for drug discovery in anti-seizure medication.
Collapse
Affiliation(s)
- Aqeela Zahra
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China
- Department of Zoology, University of Sialkot, Sialkot 51310, Pakistan
| | - Ru Liu
- Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing 100070, China
- National Clinical Research Center for Neurological Diseases, Beijing 100070, China
| | - Wenzhe Han
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China
| | - Hui Meng
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China
| | - Qun Wang
- Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
- National Clinical Research Center for Neurological Diseases, Beijing 100070, China
| | - YunFu Wang
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China
| | - Susan L. Campbell
- Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Jianping Wu
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China
- Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing 100070, China
- National Clinical Research Center for Neurological Diseases, Beijing 100070, China
| |
Collapse
|
9
|
Caulier A, Jankovsky N, Gautier EF, El Nemer W, Guitton C, Ouled-Haddou H, Guillonneau F, Mayeux P, Salnot V, Bruce J, Picard V, Garçon L. Red blood cell proteomics reveal remnant protein biosynthesis and folding pathways in PIEZO1-related hereditary xerocytosis. Front Physiol 2022; 13:960291. [PMID: 36531183 PMCID: PMC9751340 DOI: 10.3389/fphys.2022.960291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 10/21/2022] [Indexed: 11/25/2023] Open
Abstract
Hereditary xerocytosis is a dominant red cell membrane disorder characterized by an increased leak of potassium from the inside to outside the red blood cell membrane, associated with loss of water leading to red cell dehydration and chronic hemolysis. 90% of cases are related to heterozygous gain of function mutations in PIEZO1, encoding a mechanotransductor that translates a mechanical stimulus into a biological signaling. Data are still required to understand better PIEZO1-HX pathophysiology. Recent studies identified proteomics as an accurate and high-input tool to study erythroid progenitors and circulating red cell physiology. Here, we isolated red blood cells from 5 controls and 5 HX patients carrying an identified and pathogenic PIEZO1 mutation and performed a comparative deep proteomic analysis. A total of 603 proteins were identified among which 56 were differentially expressed (40 over expressed and 16 under expressed) between controls and HX with a homogenous expression profile within each group. We observed relevant modifications in the protein expression profile related to PIEZO1 mutations, identifying two main "knots". The first contained both proteins of the chaperonin containing TCP1 complex involved in the assembly of unfolded proteins, and proteins involved in translation. The second contained proteins involved in ubiquitination. Deregulation of proteins involved in protein biosynthesis was also observed in in vitro-produced reticulocytes after Yoda1 exposure. Thus, our work identifies significant changes in the protein content of PIEZO1-HX erythrocytes, revealing a "PIEZO1 signature" and identifying potentially targetable pathways in this disease characterized by a heterogeneous clinical expression and contra-indication of splenectomy.
Collapse
Affiliation(s)
- Alexis Caulier
- HEMATIM, CURS, Amiens and Laboratoire d’Hématologie, CHU Amiens, UPJV, Amiens, France
| | - Nicolas Jankovsky
- HEMATIM, CURS, Amiens and Laboratoire d’Hématologie, CHU Amiens, UPJV, Amiens, France
| | - Emilie Fleur Gautier
- 3P5 Proteom’IC, Institut Cochin, INSERM, CNRS, Université Paris Cité, Paris, France
- Institut Imagine-INSERM U1163, Necker Hospital, University of Paris, Paris, France
- Laboratoire d’excellence GR-Ex, Paris, France
| | | | - Corinne Guitton
- Laboratoire d’Hématologie et Filière MCGRE, CHU Bicêtre, Le Kremlin-Bicêtre, France
| | - Hakim Ouled-Haddou
- HEMATIM, CURS, Amiens and Laboratoire d’Hématologie, CHU Amiens, UPJV, Amiens, France
| | - François Guillonneau
- 3P5 Proteom’IC, Institut Cochin, INSERM, CNRS, Université Paris Cité, Paris, France
| | - Patrick Mayeux
- 3P5 Proteom’IC, Institut Cochin, INSERM, CNRS, Université Paris Cité, Paris, France
| | - Virginie Salnot
- 3P5 Proteom’IC, Institut Cochin, INSERM, CNRS, Université Paris Cité, Paris, France
| | - Johanna Bruce
- 3P5 Proteom’IC, Institut Cochin, INSERM, CNRS, Université Paris Cité, Paris, France
| | - Véronique Picard
- Laboratoire d’Hématologie et Filière MCGRE, CHU Bicêtre, Le Kremlin-Bicêtre, France
- Laboratoire d’Hématologie, Faculté de Pharmacie, Université Paris Saclay, Amiens, France
| | - Loïc Garçon
- HEMATIM, CURS, Amiens and Laboratoire d’Hématologie, CHU Amiens, UPJV, Amiens, France
- INSERM U1134, INTS, Paris, France
- Laboratoire d’Hématologie et Filière MCGRE, CHU Bicêtre, Le Kremlin-Bicêtre, France
| |
Collapse
|
10
|
Wulff H, Braun AP, Alper SL. Can KCa3.1 channel activators serve as novel inhibitors of platelet aggregation? J Thromb Haemost 2022; 20:2488-2490. [PMID: 36271464 DOI: 10.1111/jth.15863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Accepted: 08/22/2022] [Indexed: 11/26/2022]
Affiliation(s)
- Heike Wulff
- Department of Pharmacology, School of Medicine, University of California, Davis, California, USA
| | - Andrew P Braun
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Seth L Alper
- Division of Nephrology and Vascular Biology Research Center, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| |
Collapse
|
11
|
Allegrini B, Jedele S, David Nguyen L, Mignotet M, Rapetti-Mauss R, Etchebest C, Fenneteau O, Loubat A, Boutet A, Thomas C, Durin J, Petit A, Badens C, Garçon L, Da Costa L, Guizouarn H. New KCNN4 Variants Associated With Anemia: Stomatocytosis Without Erythrocyte Dehydration. Front Physiol 2022; 13:918620. [PMID: 36003639 PMCID: PMC9393219 DOI: 10.3389/fphys.2022.918620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 05/27/2022] [Indexed: 11/13/2022] Open
Abstract
The K+ channel activated by the Ca2+, KCNN4, has been shown to contribute to red blood cell dehydration in the rare hereditary hemolytic anemia, the dehydrated hereditary stomatocytosis. We report two de novo mutations on KCNN4, We reported two de novo mutations on KCNN4, V222L and H340N, characterized at the molecular, cellular and clinical levels. Whereas both mutations were shown to increase the calcium sensitivity of the K+ channel, leading to channel opening for lower calcium concentrations compared to WT KCNN4 channel, there was no obvious red blood cell dehydration in patients carrying one or the other mutation. The clinical phenotype was greatly different between carriers of the mutated gene ranging from severe anemia for one patient to a single episode of anemia for the other patient or no documented sign of anemia for the parents who also carried the mutation. These data compared to already published KCNN4 mutations question the role of KCNN4 gain-of-function mutations in hydration status and viability of red blood cells in bloodstream.
Collapse
Affiliation(s)
- B. Allegrini
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
| | - S. Jedele
- Université Paris Cité and Université des Antilles, Inserm, BIGR, Paris, France
| | - L. David Nguyen
- Université Paris Cité, Paris, France
- AP-HP, Service d’Hématologie Biologique, Hôpital R. Debré, Paris, France
| | - M. Mignotet
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
| | | | - C. Etchebest
- Université Paris Cité and Université des Antilles, Inserm, BIGR, Paris, France
| | - O. Fenneteau
- AP-HP, Service d’Hématologie Biologique, Hôpital R. Debré, Paris, France
| | - A. Loubat
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
| | - A. Boutet
- Hôpital Saint Nazaire, Saint-Nazaire, France
| | - C. Thomas
- CHU Nantes, Service Oncologie-hématologie et Immunologie Pédiatrique, Nantes, France
| | - J. Durin
- Sorbonne Université, AP-HP, Hôpital Armand Trousseau, Service d'Hématologie Oncologie Pédiatrique, Paris, France
| | - A. Petit
- Sorbonne Université, AP-HP, Hôpital Armand Trousseau, Service d'Hématologie Oncologie Pédiatrique, Paris, France
| | - C. Badens
- Aix Marseille Univ, INSERM, MMG, Marseille, France
- AP-HM, Department of Genetic, Marseille, France
| | - L. Garçon
- Université Picardie Jules Verne, Unité EA4666 Hematim, Amiens, France
- CHU Amiens, Service d'Hématologie Biologique, Amiens, France
| | - L. Da Costa
- Université Paris Cité, Paris, France
- AP-HP, Service d’Hématologie Biologique, Hôpital R. Debré, Paris, France
- Université Picardie Jules Verne, Unité EA4666 Hematim, Amiens, France
| | - H. Guizouarn
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
- *Correspondence: H. Guizouarn,
| |
Collapse
|
12
|
Song S, Zhang H, Wang X, Chen W, Cao W, Zhang Z, Shi C. The role of mechanosensitive Piezo1 channel in diseases. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2022; 172:39-49. [PMID: 35436566 DOI: 10.1016/j.pbiomolbio.2022.04.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 04/09/2022] [Accepted: 04/12/2022] [Indexed: 06/14/2023]
Abstract
Mechanotransduction is associated with organ development and homoeostasis. Piezo1 and Piezo2 are novel mechanosensitive ion channels (MSCs) in mammals. MSCs are membrane proteins that are critical for the mechanotransduction of living cells. Current studies have demonstrated that the Piezo protein family not only functions in volume regulation, cellular migration, proliferation, and apoptosis but is also important for human diseases of various systems. The complete loss of Piezo1 and Piezo2 function is fatal in the embryonic period. This review summarizes the role of Piezo1 in diseases of different systems and perspectives potential treatments related to Piezo1 for these diseases.
Collapse
Affiliation(s)
- Siqi Song
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao, 266071, Shandong Province, China
| | - Hong Zhang
- Department of Cardiac Surgery, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, Shandong Province, China
| | - Xiaoya Wang
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao, 266071, Shandong Province, China
| | - Wei Chen
- Department of Urology, The Affiliated Xinqiao Hospital, The Third Military Medical University, Chongqing, 400038, China
| | - Wenxuan Cao
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao, 266071, Shandong Province, China
| | - Zhe Zhang
- School of Basic Medicine, College of Medicine, Qingdao University, Qingdao 266071, Shandong Province, China.
| | - Chunying Shi
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao, 266071, Shandong Province, China.
| |
Collapse
|
13
|
Wang H, Obeidy P, Wang Z, Zhao Y, Wang Y, Su QP, Cox CD, Ju LA. Fluorescence-coupled micropipette aspiration assay to examine calcium mobilization caused by red blood cell mechanosensing. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2022; 51:135-146. [PMID: 35286429 PMCID: PMC8964638 DOI: 10.1007/s00249-022-01595-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 02/21/2022] [Accepted: 02/24/2022] [Indexed: 12/16/2022]
Abstract
Mechanical stimuli such as tension, compression, and shear stress play critical roles in the physiological functions of red blood cells (RBCs) and their homeostasis, ATP release, and rheological properties. Intracellular calcium (Ca2+) mobilization reflects RBC mechanosensing as they transverse the complex vasculature. Emerging studies have demonstrated the presence of mechanosensitive Ca2+ permeable ion channels and their function has been implicated in the regulation of RBC volume and deformability. However, how these mechanoreceptors trigger Ca2+ influx and subsequent cellular responses are still unclear. Here, we introduce a fluorescence-coupled micropipette aspiration assay to examine RBC mechanosensing at the single-cell level. To achieve a wide range of cell aspirations, we implemented and compared two negative pressure adjusting apparatuses: a homemade water manometer (- 2.94 to 0 mmH2O) and a pneumatic high-speed pressure clamp (- 25 to 0 mmHg). To visualize Ca2+ influx, RBCs were pre-loaded with an intensiometric probe Cal-520 AM, then imaged under a confocal microscope with concurrent bright-field and fluorescent imaging at acquisition rates of 10 frames per second. Remarkably, we observed the related changes in intracellular Ca2+ levels immediately after aspirating individual RBCs in a pressure-dependent manner. The RBC aspirated by the water manometer only displayed 1.1-fold increase in fluorescence intensity, whereas the RBC aspirated by the pneumatic clamp showed up to threefold increase. These results demonstrated the water manometer as a gentle tool for cell manipulation with minimal pre-activation, while the high-speed pneumatic clamp as a much stronger pressure actuator to examine cell mechanosensing directly. Together, this multimodal platform enables us to precisely control aspiration and membrane tension, and subsequently correlate this with intracellular calcium concentration dynamics in a robust and reproducible manner.
Collapse
Affiliation(s)
- Haoqing Wang
- School of Biomedical Engineering, Faculty of Engineering, The University of Sydney, Darlington, NSW, 2008, Australia.,Charles Perkins Centre, The University of Sydney, Camperdown, NSW, 2006, Australia.,Heart Research Institute, Newtown, NSW, 2042, Australia
| | - Peyman Obeidy
- School of Biomedical Engineering, Faculty of Engineering, The University of Sydney, Darlington, NSW, 2008, Australia
| | - Zihao Wang
- School of Biomedical Engineering, Faculty of Engineering, The University of Sydney, Darlington, NSW, 2008, Australia.,School of Aerospace, Mechanical and Mechatronic Engineering, Faculty of Engineering, The University of Sydney, Darlington, NSW, 2008, Australia
| | - Yunduo Zhao
- School of Biomedical Engineering, Faculty of Engineering, The University of Sydney, Darlington, NSW, 2008, Australia.,Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, NSW, 2010, Australia
| | - Yao Wang
- School of Biomedical Engineering, Faculty of Engineering, The University of Sydney, Darlington, NSW, 2008, Australia.,Cellular and Genetic Medicine Unit, School of Medical Sciences, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Qian Peter Su
- Charles Perkins Centre, The University of Sydney, Camperdown, NSW, 2006, Australia.,Heart Research Institute, Newtown, NSW, 2042, Australia.,School of Biomedical Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Charles D Cox
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, NSW, 2010, Australia.,Faculty of Medicine, St. Vincent's Clinical School, University of New South Wales, Sydney, NSW, 2010, Australia
| | - Lining Arnold Ju
- School of Biomedical Engineering, Faculty of Engineering, The University of Sydney, Darlington, NSW, 2008, Australia. .,Charles Perkins Centre, The University of Sydney, Camperdown, NSW, 2006, Australia. .,Heart Research Institute, Newtown, NSW, 2042, Australia.
| |
Collapse
|
14
|
Channelopathy-causing mutations in the S 45A/S 45B and HA/HB helices of K Ca2.3 and K Ca3.1 channels alter their apparent Ca 2+ sensitivity. Cell Calcium 2022; 102:102538. [PMID: 35030515 PMCID: PMC8844225 DOI: 10.1016/j.ceca.2022.102538] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/05/2022] [Accepted: 01/06/2022] [Indexed: 12/11/2022]
Abstract
Small- and intermediate-conductance Ca2+-activated potassium (KCa2.x and KCa3.1, also called SK and IK) channels are activated exclusively by a Ca2+-calmodulin gating mechanism. Wild-type KCa2.3 channels have a Ca2+ EC50 value of ∼0.3 μM, while the apparent Ca2+ sensitivity of wild-type KCa3.1 channels is ∼0.27 μM. Heterozygous genetic mutations of KCa2.3 channels have been associated with Zimmermann-Laband syndrome and idiopathic noncirrhotic portal hypertension, while KCa3.1 channel mutations were reported in hereditary xerocytosis patients. KCa2.3_S436C and KCa2.3_V450L channels with mutations in the S45A/S45B helices exhibited hypersensitivity to Ca2+. The corresponding mutations in KCa3.1 channels also elevated the apparent Ca2+ sensitivity. KCa3.1_S314P, KCa3.1_A322V and KCa3.1_R352H channels with mutations in the HA/HB helices are hypersensitive to Ca2+, whereas KCa2.3 channels with the equivalent mutations are not. The different effects of the equivalent mutations in the HA/HB helices on the apparent Ca2+ sensitivity of KCa2.3 and KCa3.1 channels may imply distinct modulation of the two channel subtypes by the HA/HB helices. AP14145 reduced the apparent Ca2+ sensitivity of the hypersensitive mutant KCa2.3 channels, suggesting the potential therapeutic usefulness of negative gating modulators.
Collapse
|
15
|
|
16
|
von Lindern M, Egée S, Bianchi P, Kaestner L. The Function of Ion Channels and Membrane Potential in Red Blood Cells: Toward a Systematic Analysis of the Erythroid Channelome. Front Physiol 2022; 13:824478. [PMID: 35177994 PMCID: PMC8844196 DOI: 10.3389/fphys.2022.824478] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 01/04/2022] [Indexed: 01/14/2023] Open
Abstract
Erythrocytes represent at least 60% of all cells in the human body. During circulation, they experience a huge variety of physical and chemical stimulations, such as pressure, shear stress, hormones or osmolarity changes. These signals are translated into cellular responses through ion channels that modulate erythrocyte function. Ion channels in erythrocytes are only recently recognized as utmost important players in physiology and pathophysiology. Despite this awareness, their signaling, interactions and concerted regulation, such as the generation and effects of “pseudo action potentials”, remain elusive. We propose a systematic, conjoined approach using molecular biology, in vitro erythropoiesis, state-of-the-art electrophysiological techniques, and channelopathy patient samples to decipher the role of ion channel functions in health and disease. We need to overcome challenges such as the heterogeneity of the cell population (120 days lifespan without protein renewal) or the access to large cohorts of patients. Thereto we will use genetic manipulation of progenitors, cell differentiation into erythrocytes, and statistically efficient electrophysiological recordings of ion channel activity.
Collapse
Affiliation(s)
- Marieke von Lindern
- Sanquin Research and Landsteiner Laboratory, Department of Hematopoiesis, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Department of Cell Biology and Genetics, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Stéphane Egée
- Integrative Biology of Marine Models, Station Biologique de Roscoff, CNRS, UMR 8227, Sorbonne Université, Roscoff Cedex, France
- Laboratoire d’Excellence GR-Ex, Paris, France
| | - Paola Bianchi
- Pathophysiology of Anemia Unit, Hematology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico of Milan, Milan, Italy
| | - Lars Kaestner
- Theoretical Medicine and Biosciences, Medical Faculty, Saarland University, Homburg, Germany
- Dynamics of Fluids, Experimental Physics, Saarland University, Saarbrücken, Germany
- *Correspondence: Lars Kaestner,
| |
Collapse
|
17
|
Tirincsi A, Sicking M, Hadzibeganovic D, Haßdenteufel S, Lang S. The Molecular Biodiversity of Protein Targeting and Protein Transport Related to the Endoplasmic Reticulum. Int J Mol Sci 2021; 23:143. [PMID: 35008565 PMCID: PMC8745461 DOI: 10.3390/ijms23010143] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/19/2021] [Accepted: 12/20/2021] [Indexed: 12/15/2022] Open
Abstract
Looking at the variety of the thousands of different polypeptides that have been focused on in the research on the endoplasmic reticulum from the last five decades taught us one humble lesson: no one size fits all. Cells use an impressive array of components to enable the safe transport of protein cargo from the cytosolic ribosomes to the endoplasmic reticulum. Safety during the transit is warranted by the interplay of cytosolic chaperones, membrane receptors, and protein translocases that together form functional networks and serve as protein targeting and translocation routes. While two targeting routes to the endoplasmic reticulum, SRP (signal recognition particle) and GET (guided entry of tail-anchored proteins), prefer targeting determinants at the N- and C-terminus of the cargo polypeptide, respectively, the recently discovered SND (SRP-independent) route seems to preferentially cater for cargos with non-generic targeting signals that are less hydrophobic or more distant from the termini. With an emphasis on targeting routes and protein translocases, we will discuss those functional networks that drive efficient protein topogenesis and shed light on their redundant and dynamic nature in health and disease.
Collapse
Affiliation(s)
- Andrea Tirincsi
- Department of Medical Biochemistry and Molecular Biology, Saarland University, 66421 Homburg, Germany; (A.T.); (M.S.); (D.H.)
| | - Mark Sicking
- Department of Medical Biochemistry and Molecular Biology, Saarland University, 66421 Homburg, Germany; (A.T.); (M.S.); (D.H.)
| | - Drazena Hadzibeganovic
- Department of Medical Biochemistry and Molecular Biology, Saarland University, 66421 Homburg, Germany; (A.T.); (M.S.); (D.H.)
| | - Sarah Haßdenteufel
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Sven Lang
- Department of Medical Biochemistry and Molecular Biology, Saarland University, 66421 Homburg, Germany; (A.T.); (M.S.); (D.H.)
| |
Collapse
|
18
|
Kalfa TA. Diagnosis and clinical management of red cell membrane disorders. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2021; 2021:331-340. [PMID: 34889366 PMCID: PMC8791164 DOI: 10.1182/hematology.2021000265] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Heterogeneous red blood cell (RBC) membrane disorders and hydration defects often present with the common clinical findings of hemolytic anemia, but they may require substantially different management, based on their pathophysiology. An accurate and timely diagnosis is essential to avoid inappropriate interventions and prevent complications. Advances in genetic testing availability within the last decade, combined with extensive foundational knowledge on RBC membrane structure and function, now facilitate the correct diagnosis in patients with a variety of hereditary hemolytic anemias (HHAs). Studies in patient cohorts with well-defined genetic diagnoses have revealed complications such as iron overload in hereditary xerocytosis, which is amenable to monitoring, prevention, and treatment, and demonstrated that splenectomy is not always an effective or safe treatment for any patient with HHA. However, a multitude of variants of unknown clinical significance have been discovered by genetic evaluation, requiring interpretation by thorough phenotypic assessment in clinical and/or research laboratories. Here we discuss genotype-phenotype correlations and corresponding clinical management in patients with RBC membranopathies and propose an algorithm for the laboratory workup of patients presenting with symptoms and signs of hemolytic anemia, with a clinical case that exemplifies such a workup.
Collapse
MESH Headings
- Anemia, Hemolytic, Congenital/diagnosis
- Anemia, Hemolytic, Congenital/genetics
- Anemia, Hemolytic, Congenital/pathology
- Anemia, Hemolytic, Congenital/therapy
- Disease Management
- Elliptocytosis, Hereditary/diagnosis
- Elliptocytosis, Hereditary/genetics
- Elliptocytosis, Hereditary/pathology
- Elliptocytosis, Hereditary/therapy
- Erythrocyte Membrane/pathology
- Genetic Testing
- Humans
- Hydrops Fetalis/diagnosis
- Hydrops Fetalis/genetics
- Hydrops Fetalis/pathology
- Hydrops Fetalis/therapy
- Infant
- Male
- Mutation
- Spherocytosis, Hereditary/diagnosis
- Spherocytosis, Hereditary/genetics
- Spherocytosis, Hereditary/pathology
- Spherocytosis, Hereditary/therapy
Collapse
Affiliation(s)
- Theodosia A. Kalfa
- Correspondence Theodosia A. Kalfa, Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave, MLC 7015, Cincinnati, OH 45229-3039; e-mail:
| |
Collapse
|
19
|
|
20
|
Mechanistic ion channel interactions in red cells of patients with Gárdos channelopathy. Blood Adv 2021; 5:3303-3308. [PMID: 34468723 DOI: 10.1182/bloodadvances.2020003823] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 04/07/2021] [Indexed: 12/25/2022] Open
Abstract
In patients with Gárdos channelopathy (p.R352H), an increased concentration of intracellular Ca2+ was previously reported. This is a surprising finding because the Gárdos channel (KCa3.1) is a K+ channel. Here, we confirm the increased intracellular Ca2+ for patients with the KCa3.1 mutation p.S314P. Furthermore, we provide the concept of KCa3.1 activity resulting in a flickering of red blood cell (RBC) membranepotential, which activates the CaV2.1 channel allowing Ca2+ to enter the RBC. Activity of the nonselective cation channel Piezo1 modulates the aforementioned interplay in away that a closed Piezo1 is in favor of the KCa3.1-CaV2.1 interaction. In contrast, Piezo1 openings compromise the membrane potential flickering, thus limiting the activity of CaV2.1. With the compound NS309, we mimic a gain-of-function mutation of KCa3.1. Assessing the RBC Ca2+ response by Fluo-4-based flow cytometry and by measuring the membrane potential using the Macey-Bennekou-Egée method, we provide data that support the concept of the KCa3.1/CaV2.1/Piezo1 interplay as a partial explanation for an increased number of high Ca2+ RBCs. With the pharmacological inhibition of KCa3.1 (TRAM34 and Senicapoc), CaV2.1 (ω-agatoxin TK), and Piezo1 (GsMTx-4), we could project the NS309 behavior of healthy RBCs to the RBCs of Gárdos channelopathy patients.
Collapse
|
21
|
Jankovsky N, Caulier A, Demagny J, Guitton C, Djordjevic S, Lebon D, Ouled‐Haddou H, Picard V, Garçon L. Recent advances in the pathophysiology of PIEZO1-related hereditary xerocytosis. Am J Hematol 2021; 96:1017-1026. [PMID: 33848364 DOI: 10.1002/ajh.26192] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 02/06/2023]
Abstract
Hereditary xerocytosis is a rare red blood cell disease related to gain-of-function mutations in the FAM38A gene, encoding PIEZO1, in 90% of cases; PIEZO1 is a broadly expressed mechano-transducer that plays a major role in many cell systems and tissues that respond to mechanical stress. In erythrocytes, PIEZO1 adapts the intracellular ionic content and cell hydration status to the mechanical constraints induced by the environment. Until recently, the pathophysiology of hereditary xerocytosis was mainly believed to be based on the "PIEZO1-Gardos channel axis" in erythrocytes, according to which PIEZO1-activating mutations induce a calcium influx that secondarily activates the Gardos channel, leading to potassium and water efflux and subsequently to red blood cell dehydration. However, recent studies have demonstrated additional roles for PIEZO1 during early erythropoiesis and reticulocyte maturation, as well as roles in other tissues and cells such as lymphatic vessels, hepatocytes, macrophages and platelets that may affect the pathophysiology of the disease. These findings, presented and discussed in this review, broaden our understanding of hereditary xerocytosis beyond that of primarily being a red blood cell disease and identify potential therapeutic targets.
Collapse
Affiliation(s)
- Nicolas Jankovsky
- UR4666 HEMATIM Université Picardie Jules Verne Amiens France
- Service d'Hématologie Clinique, CHU Amiens‐Picardie Amiens France
| | - Alexis Caulier
- UR4666 HEMATIM Université Picardie Jules Verne Amiens France
- Service d'Hématologie Clinique, CHU Amiens‐Picardie Amiens France
| | - Julien Demagny
- UR4666 HEMATIM Université Picardie Jules Verne Amiens France
- Service d'Hématologie Biologique, CHU Amiens‐Picardie Amiens France
| | - Corinne Guitton
- Service de Pédiatrie Générale, CHU Bicêtre Le Kremlin‐Bicêtre France
- Centre de référence des maladies constitutionnelles du globule rouge et de l'érythropoïèse (Filière MCGRE) Créteil France
| | | | - Delphine Lebon
- UR4666 HEMATIM Université Picardie Jules Verne Amiens France
- Service d'Hématologie Clinique, CHU Amiens‐Picardie Amiens France
| | | | - Véronique Picard
- Centre de référence des maladies constitutionnelles du globule rouge et de l'érythropoïèse (Filière MCGRE) Créteil France
- Service d'Hématologie Biologique, CHU Bicêtre Le Kremlin‐Bicêtre France
- Faculté de Pharmacie Université Paris Saclay Châtenay‐Malabry France
| | - Loïc Garçon
- UR4666 HEMATIM Université Picardie Jules Verne Amiens France
- Service d'Hématologie Biologique, CHU Amiens‐Picardie Amiens France
- Centre de référence des maladies constitutionnelles du globule rouge et de l'érythropoïèse (Filière MCGRE) Créteil France
| |
Collapse
|
22
|
Waldstein S, Arnold-Croop S, Carrel L, Eyster ME. Diagnosing dehydrated hereditary stomatocytosis due to a KCNN4 Gardos channel mutation: understanding challenges through study of a multi-generational family. EJHAEM 2021; 2:485-487. [PMID: 35844691 PMCID: PMC9175893 DOI: 10.1002/jha2.267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/11/2021] [Accepted: 07/13/2021] [Indexed: 12/29/2022]
Affiliation(s)
- Sasha Waldstein
- Division of Hematology/Oncology Penn State Hershey Medical Center Hershey Pennsylvania USA
| | - Sarah Arnold-Croop
- Division of Hematology/Oncology Penn State Hershey Medical Center Hershey Pennsylvania USA
| | - Laura Carrel
- Department of Biochemistry and Molecular Biology Penn State College of Medicine Hershey Pennsylvania USA
| | - M Elaine Eyster
- Division of Hematology/Oncology Penn State Hershey Medical Center Hershey Pennsylvania USA
| |
Collapse
|
23
|
Simionato G, van Wijk R, Quint S, Wagner C, Bianchi P, Kaestner L. Rare Anemias: Are Their Names Just Smoke and Mirrors? Front Physiol 2021; 12:690604. [PMID: 34177628 PMCID: PMC8222994 DOI: 10.3389/fphys.2021.690604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Accepted: 05/17/2021] [Indexed: 12/03/2022] Open
Affiliation(s)
- Greta Simionato
- Institute for Clinical and Experimental Surgery, Campus University Hospital, Saarland University, Homburg, Germany.,Experimental Physics, Dynamics of Fluids Group, Saarland University, Saarbrücken, Germany
| | - Richard van Wijk
- Central Diagnostic Laboratory - Research, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands
| | - Stephan Quint
- Experimental Physics, Dynamics of Fluids Group, Saarland University, Saarbrücken, Germany.,Cysmic GmbH, Saarbrücken, Germany
| | - Christian Wagner
- Experimental Physics, Dynamics of Fluids Group, Saarland University, Saarbrücken, Germany.,Physics and Materials Science Research Unit, University of Luxembourg, Luxembourg, Luxembourg
| | - Paola Bianchi
- Fondazione Instituto di Ricovero e Cura a Carattere Scientifico Ca' Granda Ospedale Maggiore Policlinico Milano, Unità Operativa Complessa Ematologia, Unità Operativa Semplice Fisiopatologia delle Anemie, Milan, Italy
| | - Lars Kaestner
- Experimental Physics, Dynamics of Fluids Group, Saarland University, Saarbrücken, Germany.,Theoretical Medicine and Biosciences, Campus University Hospital, Saarland University, Homburg, Germany
| |
Collapse
|
24
|
Gardos channelopathy: functional analysis of a novel KCNN4 variant. Blood Adv 2021; 4:6336-6341. [PMID: 33351129 DOI: 10.1182/bloodadvances.2020003285] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 11/12/2020] [Indexed: 12/11/2022] Open
Abstract
Key Points
We show that the novel KCNN4 variant p.S314P is a gain-of-function mutation but is less severe than the previously reported p.R352H variant. The clinical heterogeneity, blurred symptoms, and absence of specific diagnostic markers make the diagnosis of Gardos channelopathy challenging.
Collapse
|
25
|
Pérès L, Monedero Alonso D, Nudel M, Figeac M, Bruge J, Sebda S, Picard V, El Nemer W, Preudhomme C, Rose C, Egée S, Bouyer G. Characterisation of Asp669Tyr Piezo1 cation channel activity in red blood cells: an unexpected phenotype. Br J Haematol 2021; 194:e51-e55. [PMID: 33973227 DOI: 10.1111/bjh.17467] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Laurent Pérès
- Sorbonne Université, CNRS, UMR8227, Station Biologique de Roscoff, Roscoff, France.,Laboratoire d'Excellence GR-Ex, Paris, France
| | - David Monedero Alonso
- Sorbonne Université, CNRS, UMR8227, Station Biologique de Roscoff, Roscoff, France.,Laboratoire d'Excellence GR-Ex, Paris, France
| | - Morgane Nudel
- Hôpital Saint Vincent de Paul, Université Catholique, Lille, France
| | - Martin Figeac
- Univ-Lille, Plate-forme de Génomique Fonctionnelle et Structurale, Lille, France.,CHU Lille, cellule bioinformatique, plateau commun de séquençage, Lille, France
| | - Judith Bruge
- Hôpital Saint Vincent de Paul, Université Catholique, Lille, France
| | - Shéhérazade Sebda
- Univ-Lille, Plate-forme de Génomique Fonctionnelle et Structurale, Lille, France
| | | | - Wassim El Nemer
- Inserm, UMR_S 1134, Institut National de la Transfusion Sanguine INTS, Paris, France.,Laboratoire d'Excellence GR-Ex, Paris, France
| | - Claude Preudhomme
- Univ-Lille, Plate-forme de Génomique Fonctionnelle et Structurale, Lille, France
| | - Christian Rose
- Hôpital Saint Vincent de Paul, Université Catholique, Lille, France
| | - Stéphane Egée
- Sorbonne Université, CNRS, UMR8227, Station Biologique de Roscoff, Roscoff, France.,Laboratoire d'Excellence GR-Ex, Paris, France
| | - Guillaume Bouyer
- Sorbonne Université, CNRS, UMR8227, Station Biologique de Roscoff, Roscoff, France.,Laboratoire d'Excellence GR-Ex, Paris, France
| |
Collapse
|
26
|
Guo J, Gu D, Zhao T, Zhao Z, Xiong Y, Sun M, Xin C, Zhang Y, Pei L, Sun J. Trends in Piezo Channel Research Over the Past Decade: A Bibliometric Analysis. Front Pharmacol 2021; 12:668714. [PMID: 33935792 PMCID: PMC8082452 DOI: 10.3389/fphar.2021.668714] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 03/24/2021] [Indexed: 12/12/2022] Open
Abstract
Purpose: We used bibliometric methods to evaluate the global scientific output of research on Piezo channels and explore the current status and trends in this field over the past decade. Methods: Piezo channel-related studies published in 2010-2020 were retrieved from Web of Science. The R bibliometrix package was used for quantitative and qualitative analyses of publication outputs and author contributions. VOSviewer was used to construct networks based on co-authorship of countries/institutions/authors, co-citation analysis of journals/references, citation analysis of documents, and co-occurrence of keywords. Results: In total, 556 related articles and reviews were included in the final analysis. The number of publications has increased substantially with time. The country and institution contributing the most to this field was the United States and Scripps Research Institute, respectively. Ardem Patapoutian was the most productive author and ranked first among the cited authors, h-index, and m-index. The top cited reference was the article published by Coste B et al. in Science (2010) that identified Piezo1/2 in mammalian cells. The top journals in terms of the number of selected articles and citations were Nature Communications and Nature, respectively. The co-occurrence analysis revealed that Piezo channels are involved a variety of cell types (Merkel cells, neurons, endothelial cells, red blood cells), physiological processes (touch sensation, blood pressure, proprioception, vascular development), related ion channels (transient receptor potential, Gardos), and diseases (pain, distal arthrogryposis, dehydrated hereditary stomatocytosis, cancer), and pharmacology (Yoda1, GsMTx-4). Conclusion: Our bibliometric analysis shows that Piezo channel research continues to be a hotspot. The focus has evolved from Piezo identification to architecture, activation mechanism, roles in diseases, and pharmacology.
Collapse
Affiliation(s)
- Jing Guo
- Department of Acupuncture Rehabilitation, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Dongmei Gu
- Department of Acupuncture Rehabilitation, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Tingting Zhao
- Department of Acupuncture Rehabilitation, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Zhanhao Zhao
- Department of Massage, Danyang Hospital of Traditional Chinese Medicine, Danyang, China
| | - Yajun Xiong
- School of Internet of Things Engineering, Jiangnan University, Wuxi, China
| | - Mengzhu Sun
- Department of Acupuncture Rehabilitation, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Chen Xin
- Department of Acupuncture Rehabilitation, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Yujie Zhang
- Acupuncture and Massage College, Health and Rehabilitation College, Nanjing University of Chinese Medicine, Nanjing, China
| | - Lixia Pei
- Department of Acupuncture Rehabilitation, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
- Acupuncture and Moxibustion Disease Project Group of China Evidence-Based Medicine Center of Traditional Chinese Medicine, Nanjing, China
| | - Jianhua Sun
- Department of Acupuncture Rehabilitation, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
- Acupuncture and Moxibustion Disease Project Group of China Evidence-Based Medicine Center of Traditional Chinese Medicine, Nanjing, China
| |
Collapse
|
27
|
Red cell membrane disorders: structure meets function. Blood 2021; 136:1250-1261. [PMID: 32702754 DOI: 10.1182/blood.2019000946] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 01/06/2020] [Indexed: 12/12/2022] Open
Abstract
The mature red blood cell (RBC) lacks a nucleus and organelles characteristic of most cells, but it is elegantly structured to perform the essential function of delivering oxygen and removing carbon dioxide from all other cells while enduring the shear stress imposed by navigating small vessels and sinusoids. Over the past several decades, the efforts of biochemists, cell and molecular biologists, and hematologists have provided an appreciation of the complexity of RBC membrane structure, while studies of the RBC membrane disorders have offered valuable insights into structure-function relationships. Within the last decade, advances in genetic testing and its increased availability have made it possible to substantially build upon this foundational knowledge. Although disorders of the RBC membrane due to altered structural organization or altered transport function are heterogeneous, they often present with common clinical findings of hemolytic anemia. However, they may require substantially different management depending on the underlying pathophysiology. Accurate diagnosis is essential to avoid emergence of complications or inappropriate interventions. We propose an algorithm for laboratory evaluation of patients presenting with symptoms and signs of hemolytic anemia with a focus on RBC membrane disorders. Here, we review the genotypic and phenotypic variability of the RBC membrane disorders in order to raise the index of suspicion and highlight the need for correct and timely diagnosis.
Collapse
|
28
|
Fortugno C, Galea E, Cantaffa R, Gigliotti F, Fabiano RL, Talarico V, Raiola G, Galati MC. Hereditary red blood cell membrane defects. Detection of PIEZO1 mutations associated with SPTA1 mutations. An unusual clinical case of hereditary xerocytosis. Pediatr Hematol Oncol 2021; 38:184-190. [PMID: 33136529 DOI: 10.1080/08880018.2020.1829219] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Carmelo Fortugno
- Department of Pediatric Onco-Hematology, Pugliese Ciaccio Hospital, Catanzaro, Italy
| | - Eulalia Galea
- Department of Pediatric Onco-Hematology, Pugliese Ciaccio Hospital, Catanzaro, Italy
| | - Renato Cantaffa
- Department of Pediatric Onco-Hematology, Pugliese Ciaccio Hospital, Catanzaro, Italy
| | - Francesco Gigliotti
- Department of Pediatric Onco-Hematology, Pugliese Ciaccio Hospital, Catanzaro, Italy
| | - Rachele Lucia Fabiano
- Department of Pediatric Onco-Hematology, Pugliese Ciaccio Hospital, Catanzaro, Italy
| | | | - Giuseppe Raiola
- Department of Pediatrics, Pugliese Ciaccio Hospital, Catanzaro, Italy
| | - Maria Concetta Galati
- Department of Pediatric Onco-Hematology, Pugliese Ciaccio Hospital, Catanzaro, Italy
| |
Collapse
|
29
|
Rogers S, Lew VL. Up-down biphasic volume response of human red blood cells to PIEZO1 activation during capillary transits. PLoS Comput Biol 2021; 17:e1008706. [PMID: 33657092 PMCID: PMC7928492 DOI: 10.1371/journal.pcbi.1008706] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 01/14/2021] [Indexed: 02/07/2023] Open
Abstract
In this paper we apply a novel JAVA version of a model on the homeostasis of human red blood cells (RBCs) to investigate the changes RBCs experience during single capillary transits. In the companion paper we apply a model extension to investigate the changes in RBC homeostasis over the approximately 200000 capillary transits during the ~120 days lifespan of the cells. These are topics inaccessible to direct experimentation but rendered mature for a computational modelling approach by the large body of recent and early experimental results which robustly constrain the range of parameter values and model outcomes, offering a unique opportunity for an in depth study of the mechanisms involved. Capillary transit times vary between 0.5 and 1.5s during which the red blood cells squeeze and deform in the capillary stream transiently opening stress-gated PIEZO1 channels allowing ion gradient dissipation and creating minuscule quantal changes in RBC ion contents and volume. Widely accepted views, based on the effects of experimental shear stress on human RBCs, suggested that quantal changes generated during capillary transits add up over time to develop the documented changes in RBC density and composition during their long circulatory lifespan, the quantal hypothesis. Applying the new red cell model (RCM) we investigated here the changes in homeostatic variables that may be expected during single capillary transits resulting from transient PIEZO1 channel activation. The predicted quantal volume changes were infinitesimal in magnitude, biphasic in nature, and essentially irreversible within inter-transit periods. A sub-second transient PIEZO1 activation triggered a sharp swelling peak followed by a much slower recovery period towards lower-than-baseline volumes. The peak response was caused by net CaCl2 and fluid gain via PIEZO1 channels driven by the steep electrochemical inward Ca2+ gradient. The ensuing dehydration followed a complex time-course with sequential, but partially overlapping contributions by KCl loss via Ca2+-activated Gardos channels, restorative Ca2+ extrusion by the plasma membrane calcium pump, and chloride efflux by the Jacobs-Steward mechanism. The change in relative cell volume predicted for single capillary transits was around 10-5, an infinitesimal volume change incompatible with a functional role in capillary flow. The biphasic response predicted by the RCM appears to conform to the quantal hypothesis, but whether its cumulative effects could account for the documented changes in density during RBC senescence required an investigation of the effects of myriad transits over the full four months circulatory lifespan of the cells, the subject of the next paper.
Collapse
Affiliation(s)
- Simon Rogers
- School of Computing Science, University of Glasgow, United Kingdom
| | - Virgilio L. Lew
- Physiological Laboratory, Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Site, Cambridge, United Kingdom
| |
Collapse
|
30
|
Picard V, Guitton C, Mansour-Hendili L, Jondeau B, Bendélac L, Denguir M, Demagny J, Proulle V, Galactéros F, Garçon L. Rapid Gardos Hereditary Xerocytosis Diagnosis in 8 Families Using Reticulocyte Indices. Front Physiol 2021; 11:602109. [PMID: 33519508 PMCID: PMC7841495 DOI: 10.3389/fphys.2020.602109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/11/2020] [Indexed: 11/30/2022] Open
Abstract
Gardos channelopathy (Gardos-HX) or type 2 stomatocytosis/xerocytosis is a hereditary hemolytic anemia due to mutations in the KCNN4 gene. It is rarer than inherited type 1 xerocytosis due to PIEZO1 mutations (Piezo1-HX) and its diagnosis is difficult given the absence of a specific clinical or biological phenotype. We report here that this diagnosis can be sped up using red blood cell (RBC) indices performed on an ADVIA 2120 (Siemens®) analyzer, which measures reticulocyte mean corpuscular volume (rMCV) and mean corpuscular hemoglobin concentration (rMCHC). We studied reticulocyte indices in 3 new and 12 described patients (8 families) with Gardos-HX, 11 subjects presented the recurrent p.Arg352His mutation, 4 cases (two families) carried a private KCNN4 mutation. They were compared to 79 described patients (49 families) with Piezo1-HX. Surprisingly, in Gardos-HX cases, rMCV revealed to be smaller than MCV and rMCHC higher than MCHC, in contrast with normal or Piezo1-HX RBC. Consequently, ΔMCV (rMCV-MCV) was −0.9 ± 5 fL vs. 19.8 ± 3 fL (p < 0.001) in Gardos compared with Piezo1-HX and ΔMCHC (rMCHC-MCHC) was 18.7 ± 13 vs. −50 ± 8.7 g/L (p < 0.001). A threshold of 8.6 fL for ΔMCV and −5.5 g/L for ΔMCHC could discriminate between Gardos and Piezo1-HX with 100% sensitivity and specificity, regardless of age, mutation or splenectomy status. Consequently, we showed that reticulocytes indices are useful to suggest Gardos-HX on blood count results, allowing to rapidly target these patients for gene analysis. In addition, these parameters may prove useful as a ‘functional tool’ in interpreting new KCNN4 variants.
Collapse
Affiliation(s)
- Véronique Picard
- Service d'Hématologie Biologique, Assistance Publique-Hôpitaux de Paris, Hôpital Bicêtre, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France.,Faculté de Pharmacie, Université Paris-Saclay, Châtenay-Malabry, France
| | - Corinne Guitton
- Service de Pédiatrie Générale, Assistance Publique-Hôpitaux de Paris, Hôpital Bicêtre, Filière MCGRE, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France
| | - Lamisse Mansour-Hendili
- Department of Molecular Genetics, Assistance Publique-Hôpitaux de Paris, Henri Mondor University Hospital, Créteil, France
| | - Bernard Jondeau
- Service d'Hématologie Biologique, Assistance Publique-Hôpitaux de Paris, Hôpital Bicêtre, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France
| | - Laurence Bendélac
- Service d'Hématologie Biologique, Assistance Publique-Hôpitaux de Paris, Hôpital Bicêtre, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France
| | - Maha Denguir
- Service de Biochimie, Assistance Publique-Hôpitaux de Paris, Bicêtre Hospital, Le Kremlin-Bicêtre, France
| | - Julien Demagny
- Service d'Hématologie Biologique, CHU Amiens, EA 4666 HEMATIM-UPJV, Amiens, France
| | - Valérie Proulle
- Service d'Hématologie Biologique, Assistance Publique-Hôpitaux de Paris, Hôpital Bicêtre, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France
| | - Frédéric Galactéros
- Centre de Référence des Syndromes Drépanocytaires Majeurs, Hôpital Henri-Mondor, AP-HP, Créteil, France
| | - Loic Garçon
- Service d'Hématologie Biologique, Assistance Publique-Hôpitaux de Paris, Hôpital Bicêtre, Hôpitaux Universitaires Paris-Saclay, Le Kremlin-Bicêtre, France.,Service d'Hématologie Biologique, CHU Amiens, EA 4666 HEMATIM-UPJV, Amiens, France
| |
Collapse
|
31
|
Robledo RF, Ciciotte SL, Graber JH, Zhao Y, Lambert AJ, Gwynn B, Maki NJ, Brindley EC, Hartman E, Blanc L, Peters LL. Differential effects of RASA3 mutations on hematopoiesis are profoundly influenced by genetic background and molecular variant. PLoS Genet 2020; 16:e1008857. [PMID: 33370780 PMCID: PMC7793307 DOI: 10.1371/journal.pgen.1008857] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 01/08/2021] [Accepted: 11/24/2020] [Indexed: 01/31/2023] Open
Abstract
Studies of the severely pancytopenic scat mouse model first demonstrated the crucial role of RASA3, a dual RAS and RAP GTPase activating protein (GAP), in hematopoiesis. RASA3 is required for survival in utero; germline deletion is lethal at E12.5–13.5 due to severe hemorrhage. Here, conditional deletion in hematopoietic stem and progenitor cells (HSPCs) using Vav-iCre recapitulates the null phenotype demonstrating that RASA3 is required at the stem and progenitor level to maintain blood vessel development and integrity and effective blood production. In adults, bone marrow blood cell production and spleen stress erythropoiesis are suppressed significantly upon induction of RASA3 deficiency, leading to pancytopenia and death within two weeks. Notably, RASA3 missense mutations in two mouse models, scat (G125V) and hlb381 (H794L), show dramatically different hematopoietic consequences specific to both genetic background and molecular variant. The mutation effect is mediated at least in part by differential effects on RAS and RAP activation. In addition, we show that the role of RASA3 is conserved during human terminal erythropoiesis, highlighting a potential function for the RASA3-RAS axis in disordered erythropoiesis in humans. Finally, global transcriptomic studies in scat suggest potential targets to ameliorate disease progression. Hematopoiesis is the process by which blood cells are formed. An individual must have a normal complement of red blood cells to prevent anemia, platelets to control bleeding, and white blood cells to maintain immune functions. All blood cells are derived from hematopoietic stem cells that differentiate into progenitor cells that then develop into mature circulating cells. We studied several mouse strains carrying different mutations in the gene encoding RASA3 and human CD34+ cells, which can be induced to produce blood cells in culture. We show that RASA3 is required at the earliest stages of blood formation, the stem and progenitor cells, and that the complement of genes other than RASA3, or the genetic background, profoundly alters the overall effect on blood formation. Further, the molecular nature of the mutation in RASA3 also has a profound and independent effect on overall blood formation. One mutant mouse strain, designated scat, suffers cyclic anemia characterized by severe anemic crisis episodes interspersed with remissions where the anemia significantly improves. Comparison of scat crisis and remission hematopoietic stem and progenitor cells reveals striking differences in gene expression. Analyses of these expression differences provide clues to processes that potentially drive improvement of anemia in scat and provide new avenues to pursue in future studies to identify novel therapeutics for anemia.
Collapse
Affiliation(s)
| | | | - Joel H. Graber
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine, United States of America
| | - Yue Zhao
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
| | - Amy J. Lambert
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
| | - Babette Gwynn
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
| | - Nathaniel J. Maki
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine, United States of America
| | - Elena C. Brindley
- Feinstein Institutes for Medical Research, Manhasset, New York, United States of America
| | - Emily Hartman
- Feinstein Institutes for Medical Research, Manhasset, New York, United States of America
| | - Lionel Blanc
- Feinstein Institutes for Medical Research, Manhasset, New York, United States of America
- * E-mail: (LB); (LLP)
| | - Luanne L. Peters
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
- * E-mail: (LB); (LLP)
| |
Collapse
|
32
|
Zaninoni A, Fermo E, Vercellati C, Marcello AP, Barcellini W, Bianchi P. Congenital Hemolytic Anemias: Is There a Role for the Immune System? Front Immunol 2020; 11:1309. [PMID: 32655575 PMCID: PMC7324678 DOI: 10.3389/fimmu.2020.01309] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 05/22/2020] [Indexed: 01/19/2023] Open
Abstract
Congenital hemolytic anemias (CHAs) are a heterogeneous group of rare hereditary conditions including defects of erythrocyte membrane proteins, red cell enzymes, and disorders due to defective erythropoiesis. They are characterized by variable degree of anemia, chronic extravascular hemolysis, reduced erythrocyte life span, splenomegaly, jaundice, biliary lithiasis, and iron overload. Although few data are reported on the role of the immune system in CHAs, several immune-mediated mechanisms may be involved in the pathogenesis of these rare diseases. We reported in ~60% of patients with hereditary spherocytosis (HS), the presence of naturally-occurring autoantibodies (NAbs) directed against different membrane proteins (α- and β-spectrin, band 3, and dematin). Positive HS subjects showed a more hemolytic pattern and NAbs were more evident in aged erythrocytes. The latter is in line with the function of NAbs in the opsonization of damaged/senescent erythrocytes and their consequent removal in the spleen. Splenectomy, usually performed to reduce erythrocyte catheresis and improve Hb levels, has different efficacy in various CHAs. Median Hb increase is 3 g/dL in HS, 1.6–1.8 g/dL in pyruvate kinase deficiency (PKD), and 1 g/dL in congenital dyserythropoietic anemias (CDA) type II. Consistently with clinical severity, splenectomy is performed in 20% of HS, 45% of CDAII, and in 60% of PKD patients. Importantly, sepsis and thrombotic events have been registered, particularly in PKD with a frequency of ~7% for both. Furthermore, we analyzed the role of pro-inflammatory cytokines and found that interleukin 10 and interferon γ, and to a lesser extent interleukin 6, were increased in all CHAs compared with controls. Moreover, CDAII and enzymatic defects showed increased tumor necrosis factor-α and reduced interleukin 17. Finally, we reported that iron overload occurred in 31% of patients with membrane defects, in ~60% of CDAII cases, and in up to 82% of PKD patients (defined by MRI liver iron concentration >4 mg Fe/gdw). Hepcidin was slightly increased in CHAs compared with controls and positively correlated with ferritin and with the inflammatory cytokines interleukin 6 and interferon γ. Overall the results suggest the existence of a vicious circle between chronic hemolysis, inflammatory response, bone marrow dyserythropoiesis, and iron overload.
Collapse
Affiliation(s)
- Anna Zaninoni
- UOS Fisiopatologia delle Anemie, UOC Ematologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Elisa Fermo
- UOS Fisiopatologia delle Anemie, UOC Ematologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Cristina Vercellati
- UOS Fisiopatologia delle Anemie, UOC Ematologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Anna Paola Marcello
- UOS Fisiopatologia delle Anemie, UOC Ematologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Wilma Barcellini
- UOS Fisiopatologia delle Anemie, UOC Ematologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Paola Bianchi
- UOS Fisiopatologia delle Anemie, UOC Ematologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| |
Collapse
|
33
|
Heterogeneous phenotype of Hereditary Xerocytosis in association with PIEZO1 variants. Blood Cells Mol Dis 2020; 82:102413. [DOI: 10.1016/j.bcmd.2020.102413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/06/2020] [Accepted: 02/06/2020] [Indexed: 02/02/2023]
|
34
|
Mechanosensitive Piezo1 ion channel protein (PIEZO1 gene): update and extended mutation analysis of hereditary xerocytosis in India. Ann Hematol 2020; 99:715-727. [PMID: 32112123 DOI: 10.1007/s00277-020-03955-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 02/06/2020] [Indexed: 12/24/2022]
Abstract
Hereditary xerocytosis (HX), also known as dehydrated stomatocytosis (DHSt) is a dominantly inherited genetic disorder exhibiting red cell membrane dehydration caused by the loss of the monovalent cation K+ and water. Variants in mechanosensitive Piezo ionic channels of the PIEZO1 gene are the primary cause of HX. We have utilized high throughput and highly precise next-generation sequencing (NGS) to make a diagnosis and examine the genotype-phenotype relationship in inflexible HX cases. Seven unrelated patients with unexplained hemolytic anemia were scrutinized with a panel probing 8000 genes related to congenital anemia. Targeted next-generation sequencing identified 8 missense variants in the PIEZO1 gene in 7 unrelated Indian patients. Three of the 8 variants are novel (c.1795G > C, c.2915G > A, c.7372 T > C) and the remaining five (c.4082A > G, c.6829C > A, c.7374C > G, c.7381G > A, c.7483_7488dup) are previously reported. The variants have been validated by Sanger sequencing. One patient with autosomal dominant mutation (c.7372 T > C) is associated with iron refractory iron deficiency anemia. Of the 7 patients, one has HX in combination with a novel homozygous variant (c.994G > A) in the PKLR gene causing PK deficiency resulting in severe clinical manifestations with phenotypic variability. In silico prediction using bioinformatics tools were used to study the possible damaging effects of the novel variants. Structural-functional analysis of the novel variants was investigated by molecular modeling software (PyMOL and Swiss PDB). These results encompass the heterogeneous behavior of mechano-sensitive Piezo1 protein observed in HX patients in India. Moreover, NGS imparted a subtle, economical, and quick tool for understanding the genetic cause of undiagnosed cases of congenital hemolytic anemia. NGS grants a potential technology integrating clinical history together with molecular report profiting in such patients and their families.
Collapse
|
35
|
Maciak K, Adamowicz-Salach A, Siwicka A, Poznanski J, Urasinski T, Plochocka D, Gora M, Burzynska B. Hereditary xerocytosis - spectrum and clinical manifestations of variants in the PIEZO1 gene, including co-occurrence with a novel β-globin mutation. Blood Cells Mol Dis 2020; 80:102378. [DOI: 10.1016/j.bcmd.2019.102378] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 10/21/2019] [Accepted: 10/21/2019] [Indexed: 11/25/2022]
|
36
|
Andolfo I, Rosato BE, Manna F, De Rosa G, Marra R, Gambale A, Girelli D, Russo R, Iolascon A. Gain-of-function mutations in PIEZO1 directly impair hepatic iron metabolism via the inhibition of the BMP/SMADs pathway. Am J Hematol 2020; 95:188-197. [PMID: 31737919 DOI: 10.1002/ajh.25683] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 02/06/2023]
Abstract
Dehydrated hereditary stomatocytosis (DHS), or xerocytosis, is an autosomal dominant hemolytic anemia. Most patients with DHS carry mutations in the PIEZO1 gene encoding a mechanosensitive cation channel. We here demonstrate that patients with DHS have low levels of hepcidin and only a slight increase of ERFE, the erythroid negative regulator of hepcidin. We demonstrated that at the physiological level, PIEZO1 activation induced Ca2+ influx and suppression of HAMP expression in primary hepatocytes. In two hepatic cellular models expressing PIEZO1 WT and two PIEZO1 gain-of-function mutants (R2456H and R2488Q), we highlight altered expression of a few genes/proteins involved in iron metabolism. Mutant cells showed increased intracellular Ca2+ compared to WT, which was correlated to increased phosphorylation of ERK1/2, inhibition of the BMP-SMADs pathway, and suppression of HAMP transcription. Moreover, the HuH7 cells, treated with PD0325901, a potent inhibitor of ERK1/2 phosphorylation, reduced the phosphorylation of ERK1/2 with the consequent increased phosphorylation of SMAD1/5/8, confirming the link between the two pathways. Another "proof of concept" for the mechanism that links PIEZO1 to HAMP regulation was obtained by mimicking PIEZO1 activation by cell Ca2+ overload, by the Ca2+ ionophore A23187. There was strong down-regulation of HAMP gene expression after this Ca2+ overload. Finally, the inhibition of PIEZO1 by GsMTx4 leads to phenotype rescue. This is the first demonstration of a direct link between PIEZO1 and iron metabolism, which defines the channel as a new hepatic iron metabolism regulator and as a possible therapeutic target of iron overload in DHS and other iron-loading anemias.
Collapse
Affiliation(s)
- Immacolata Andolfo
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| | - Barbara Eleni Rosato
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| | - Francesco Manna
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| | - Gianluca De Rosa
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| | - Roberta Marra
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| | - Antonella Gambale
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| | - Domenico Girelli
- Section of Internal Medicine, Department of MedicineUniversity of Verona Verona Italy
| | - Roberta Russo
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| | - Achille Iolascon
- Dipartimento di Medicina Molecolare e Biotecnologie MedicheUniversità degli Studi di Napoli ‘Federico II’ Naples Italy
- CEINGE, Biotecnologie Avanzate Naples Italy
| |
Collapse
|
37
|
Kaestner L, Bogdanova A, Egee S. Calcium Channels and Calcium-Regulated Channels in Human Red Blood Cells. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1131:625-648. [PMID: 31646528 DOI: 10.1007/978-3-030-12457-1_25] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Free Calcium (Ca2+) is an important and universal signalling entity in all cells, red blood cells included. Although mature mammalian red blood cells are believed to not contain organelles as Ca2+ stores such as the endoplasmic reticulum or mitochondria, a 20,000-fold gradient based on a intracellular Ca2+ concentration of approximately 60 nM vs. an extracellular concentration of 1.2 mM makes Ca2+-permeable channels a major signalling tool of red blood cells. However, the internal Ca2+ concentration is tightly controlled, regulated and maintained primarily by the Ca2+ pumps PMCA1 and PMCA4. Within the last two decades it became evident that an increased intracellular Ca2+ is associated with red blood cell clearance in the spleen and promotes red blood cell aggregability and clot formation. In contrast to this rather uncontrolled deadly Ca2+ signals only recently it became evident, that a temporal increase in intracellular Ca2+ can also have positive effects such as the modulation of the red blood cells O2 binding properties or even be vital for brief transient cellular volume adaptation when passing constrictions like small capillaries or slits in the spleen. Here we give an overview of Ca2+ channels and Ca2+-regulated channels in red blood cells, namely the Gárdos channel, the non-selective voltage dependent cation channel, Piezo1, the NMDA receptor, VDAC, TRPC channels, CaV2.1, a Ca2+-inhibited channel novel to red blood cells and i.a. relate these channels to the molecular unknown sickle cell disease conductance Psickle. Particular attention is given to correlation of functional measurements with molecular entities as well as the physiological and pathophysiological function of these channels. This view is in constant progress and in particular the understanding of the interaction of several ion channels in a physiological context just started. This includes on the one hand channelopathies, where a mutation of the ion channel is the direct cause of the disease, like Hereditary Xerocytosis and the Gárdos Channelopathy. On the other hand it applies to red blood cell related diseases where an altered channel activity is a secondary effect like in sickle cell disease or thalassemia. Also these secondary effects should receive medical and pharmacologic attention because they can be crucial when it comes to the life-threatening symptoms of the disease.
Collapse
Affiliation(s)
- Lars Kaestner
- Theoretical Medicine and Biosciences, Saarland University, Homburg, Germany. .,Experimental Physics, Saarland University, Saarbrücken, Germany.
| | - Anna Bogdanova
- Red Blood Cell Research Group, Institute of Veterinary Physiology, Vetsuisse Faculty and the Zürich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
| | - Stephane Egee
- CNRS, UMR8227 LBI2M, Sorbonne Université, Roscoff, France.,Laboratoire d'Excellence GR-Ex, Paris, France
| |
Collapse
|
38
|
Iolascon A, Andolfo I, Russo R. Advances in understanding the pathogenesis of red cell membrane disorders. Br J Haematol 2019; 187:13-24. [PMID: 31364155 DOI: 10.1111/bjh.16126] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Hereditary erythrocyte membrane disorders are caused by mutations in genes encoding various transmembrane or cytoskeletal proteins of red blood cells. The main consequences of these genetic alterations are decreased cell deformability and shortened erythrocyte survival. Red blood cell membrane defects encompass a heterogeneous group of haemolytic anaemias caused by either (i) altered membrane structural organisation (hereditary spherocytosis, hereditary elliptocytosis, hereditary pyropoikilocytosis and Southeast Asian ovalocytosis) or (ii) altered membrane transport function (overhydrated hereditary stomatocytosis, dehydrated hereditary stomatocytosis or xerocytosis, familial pseudohyperkalaemia and cryohydrocytosis). Herein we provide a comprehensive review of the recent literature on the molecular genetics of erythrocyte membrane defects and their reported clinical consequences. We also describe the effect of low-expression genetic variants on the high inter- and intra-familial phenotype variability of erythrocyte structural defects.
Collapse
Affiliation(s)
- Achille Iolascon
- Department of Molecular Medicine and Medical Biotechnologies, Federico II" University of Naples, Naples, Italy.,CEINGE - Biotecnologie Avanzate, Naples, Italy
| | - Immacolata Andolfo
- Department of Molecular Medicine and Medical Biotechnologies, Federico II" University of Naples, Naples, Italy.,CEINGE - Biotecnologie Avanzate, Naples, Italy
| | - Roberta Russo
- Department of Molecular Medicine and Medical Biotechnologies, Federico II" University of Naples, Naples, Italy.,CEINGE - Biotecnologie Avanzate, Naples, Italy
| |
Collapse
|
39
|
Pretini V, Koenen MH, Kaestner L, Fens MHAM, Schiffelers RM, Bartels M, Van Wijk R. Red Blood Cells: Chasing Interactions. Front Physiol 2019; 10:945. [PMID: 31417415 PMCID: PMC6684843 DOI: 10.3389/fphys.2019.00945] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 07/09/2019] [Indexed: 12/13/2022] Open
Abstract
Human red blood cells (RBC) are highly differentiated cells that have lost all organelles and most intracellular machineries during their maturation process. RBC are fundamental for the nearly all basic physiologic dynamics and they are key cells in the body's respiratory system by being responsible for the oxygen transport to all cells and tissues, and delivery of carbon dioxide to the lungs. With their flexible structure RBC are capable to deform in order to travel through all blood vessels including very small capillaries. Throughout their in average 120 days lifespan, human RBC travel in the bloodstream and come in contact with a broad range of different cell types. In fact, RBC are able to interact and communicate with endothelial cells (ECs), platelets, macrophages, and bacteria. Additionally, they are involved in the maintenance of thrombosis and hemostasis and play an important role in the immune response against pathogens. To clarify the mechanisms of interaction of RBC and these other cells both in health and disease as well as to highlight the role of important key players, we focused our interest on RBC membrane components such as ion channels, proteins, and phospholipids.
Collapse
Affiliation(s)
- Virginia Pretini
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands
- Theoretical Medicine and Biosciences, Saarland University, Homburg, Germany
| | - Mischa H. Koenen
- Department of Laboratory of Translational Immunology and Department of Pediatric Immunology, Wilhelmina Children’s Hospital, University Medical Centre Utrecht, Utrecht, Netherlands
| | - Lars Kaestner
- Theoretical Medicine and Biosciences, Saarland University, Homburg, Germany
- Experimental Physics, Saarland University, Saarbrücken, Germany
| | - Marcel H. A. M. Fens
- Department of Pharmaceutics, Utrecht Institute of Pharmaceutical Sciences (UIPS), Faculty of Science, Utrecht University, Utrecht, Netherlands
| | - Raymond M. Schiffelers
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands
| | - Marije Bartels
- Paediatric Haematology Department, Wilhelmina Children’s Hospital, University Medical Centre Utrecht, Utrecht, Netherlands
| | - Richard Van Wijk
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands
| |
Collapse
|
40
|
Brown BM, Shim H, Christophersen P, Wulff H. Pharmacology of Small- and Intermediate-Conductance Calcium-Activated Potassium Channels. Annu Rev Pharmacol Toxicol 2019; 60:219-240. [PMID: 31337271 DOI: 10.1146/annurev-pharmtox-010919-023420] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The three small-conductance calcium-activated potassium (KCa2) channels and the related intermediate-conductance KCa3.1 channel are voltage-independent K+ channels that mediate calcium-induced membrane hyperpolarization. When intracellular calcium increases in the channel vicinity, it calcifies the flexible N lobe of the channel-bound calmodulin, which then swings over to the S4-S5 linker and opens the channel. KCa2 and KCa3.1 channels are highly druggable and offer multiple binding sites for venom peptides and small-molecule blockers as well as for positive- and negative-gating modulators. In this review, we briefly summarize the physiological role of KCa channels and then discuss the pharmacophores and the mechanism of action of the most commonly used peptidic and small-molecule KCa2 and KCa3.1 modulators. Finally, we describe the progress that has been made in advancing KCa3.1 blockers and KCa2.2 negative- and positive-gating modulators toward the clinic for neurological and cardiovascular diseases and discuss the remaining challenges.
Collapse
Affiliation(s)
- Brandon M Brown
- Department of Pharmacology, University of California, Davis, California 95616, USA;
| | - Heesung Shim
- Department of Pharmacology, University of California, Davis, California 95616, USA;
| | | | - Heike Wulff
- Department of Pharmacology, University of California, Davis, California 95616, USA;
| |
Collapse
|
41
|
Frederiksen H. Dehydrated hereditary stomatocytosis: clinical perspectives. J Blood Med 2019; 10:183-191. [PMID: 31308777 PMCID: PMC6613601 DOI: 10.2147/jbm.s179764] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Accepted: 06/14/2019] [Indexed: 12/30/2022] Open
Abstract
Dehydrated hereditary stomatocytosis (DHSt) is a nonimmune congenital hemolytic disorder characterized by red blood cell (RBC) dehydration and lysis. It has been a recognized diagnostic entity for almost 50 years, and autosomal dominant inheritance has long been suspected, but it was not until 2011 that the first genetic alterations were identified. The current study reviews 73 articles published during 1971–2019 and focuses on clinical perspectives of the disease. All but one of the published clinical data in DHSt were either single case reports or case series. From these, it can be seen that patients with DHSt often have fully or partially compensated hemolysis with few symptoms. Despite this, iron overload is an almost universal finding even in patients without or with only sporadic blood transfusions, and this may lead to organ dysfunction. Other severe complications, such as thrombosis and perinatal fluid effusions unrelated to fetal hemoglobin concentration, may also occur. No specific treatment for symptomatic hemolysis exists, and splenectomy should be avoided as it seems to aggravate the risk of thrombosis. Recently, treatment with senicapoc has shown activity against RBC dehydration in vitro; however, it is not known if this translates into relevant clinical effects. In conclusion, despite recent advances in the understanding of pathophysiology in DHSt, options for clinical management have not improved. Entering data into international registries has the potential to fill gaps in knowledge and eventually care of these rare patients.
Collapse
|
42
|
Gain-of-Function Mutations in KCNN3 Encoding the Small-Conductance Ca 2+-Activated K + Channel SK3 Cause Zimmermann-Laband Syndrome. Am J Hum Genet 2019; 104:1139-1157. [PMID: 31155282 DOI: 10.1016/j.ajhg.2019.04.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 04/15/2019] [Indexed: 01/16/2023] Open
Abstract
Zimmermann-Laband syndrome (ZLS) is characterized by coarse facial features with gingival enlargement, intellectual disability (ID), hypertrichosis, and hypoplasia or aplasia of nails and terminal phalanges. De novo missense mutations in KCNH1 and KCNK4, encoding K+ channels, have been identified in subjects with ZLS and ZLS-like phenotype, respectively. We report de novo missense variants in KCNN3 in three individuals with typical clinical features of ZLS. KCNN3 (SK3/KCa2.3) constitutes one of three members of the small-conductance Ca2+-activated K+ (SK) channels that are part of a multiprotein complex consisting of the pore-forming channel subunits, the constitutively bound Ca2+ sensor calmodulin, protein kinase CK2, and protein phosphatase 2A. CK2 modulates Ca2+ sensitivity of the channels by phosphorylating SK-bound calmodulin. Patch-clamp whole-cell recordings of KCNN3 channel-expressing CHO cells demonstrated that disease-associated mutations result in gain of function of the mutant channels, characterized by increased Ca2+ sensitivity leading to faster and more complete activation of KCNN3 mutant channels. Pretreatment of cells with the CK2 inhibitor 4,5,6,7-tetrabromobenzotriazole revealed basal inhibition of wild-type and mutant KCNN3 channels by CK2. Analogous experiments with the KCNN3 p.Val450Leu mutant previously identified in a family with portal hypertension indicated basal constitutive channel activity and thus a different gain-of-function mechanism compared to the ZLS-associated mutant channels. With the report on de novo KCNK4 mutations in subjects with facial dysmorphism, hypertrichosis, epilepsy, ID, and gingival overgrowth, we propose to combine the phenotypes caused by mutations in KCNH1, KCNK4, and KCNN3 in a group of neurological potassium channelopathies caused by an increase in K+ conductance.
Collapse
|
43
|
Rivera A, Vandorpe DH, Shmukler BE, Andolfo I, Iolascon A, Archer NM, Shabani E, Auerbach M, Hamerschlak N, Morton J, Wohlgemuth JG, Brugnara C, Snyder LM, Alper SL. Erythrocyte ion content and dehydration modulate maximal Gardos channel activity in KCNN4 V282M/+ hereditary xerocytosis red cells. Am J Physiol Cell Physiol 2019; 317:C287-C302. [PMID: 31091145 DOI: 10.1152/ajpcell.00074.2019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hereditary xerocytosis (HX) is caused by missense mutations in either the mechanosensitive cation channel PIEZO1 or the Ca2+-activated K+ channel KCNN4. All HX-associated KCNN4 mutants studied to date have revealed increased current magnitude and red cell dehydration. Baseline KCNN4 activity was increased in HX red cells heterozygous for KCNN4 mutant V282M. However, HX red cells maximally stimulated by Ca2+ ionophore A23187 or by PMCA Ca2+-ATPase inhibitor orthovanadate displayed paradoxically reduced KCNN4 activity. This reduced Ca2+-stimulated mutant KCNN4 activity in HX red cells was associated with unchanged sensitivity to KCNN4 inhibitor senicapoc and KCNN4 activator Ca2+, with slightly elevated Ca2+ uptake and reduced PMCA activity, and with decreased KCNN4 activation by calpain inhibitor PD150606. The altered intracellular monovalent cation content of HX red cells prompted experimental nystatin manipulation of red cell Na and K contents. Nystatin-mediated reduction of intracellular K+ with corresponding increase in intracellular Na+ in wild-type cells to mimic conditions of HX greatly suppressed vanadate-stimulated and A23187-stimulated KCNN4 activity in those wild-type cells. However, conferral of wild-type cation contents on HX red cells failed to restore wild-type-stimulated KCNN4 activity to those HX cells. The phenotype of reduced, maximally stimulated KCNN4 activity was shared by HX erythrocytes expressing heterozygous PIEZO1 mutants R2488Q and V598M, but not by HX erythrocytes expressing heterozygous KCNN4 mutant R352H or PIEZO1 mutant R2456H. Our data suggest that chronic KCNN4-driven red cell dehydration and intracellular cation imbalance can lead to reduced KCNN4 activity in HX and wild-type red cells.
Collapse
Affiliation(s)
- Alicia Rivera
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - David H Vandorpe
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Boris E Shmukler
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Immacolata Andolfo
- Department of Molecular Medicine and Medical Biotechnologies, "Federico II" University of Naples, CEINGE Biotecnologie Avanzate, Naples, Italy
| | - Achille Iolascon
- Department of Molecular Medicine and Medical Biotechnologies, "Federico II" University of Naples, CEINGE Biotecnologie Avanzate, Naples, Italy
| | - Natasha M Archer
- Division of Hematology and Oncology, Boston Children's Hospital, Dana-Farber Cancer Center, Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Estela Shabani
- Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
| | | | - Nelson Hamerschlak
- Department of Hematology, Hospital Israelita Albert Einstein, Sao Paulo, Brazil
| | - James Morton
- Quest Diagnostics, San Juan Capistrano, California
| | | | - Carlo Brugnara
- Department of Laboratory Medicine, Boston Children's Hospital and Department of Pathology, Harvard Medical School, Boston, Massachusetts
| | - L Michael Snyder
- Quest Diagnostics, Marlborough, Massachusetts.,Departments of Medicine and Laboratory Medicine, University of Massachusetts Medical Center, Worcester, Massachusetts
| | - Seth L Alper
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.,Broad Institute of Harvard and Massachusetts Institute of Technology, Cambridge, Massachusetts
| |
Collapse
|
44
|
Rets A, Clayton AL, Christensen RD, Agarwal AM. Molecular diagnostic update in hereditary hemolytic anemia and neonatal hyperbilirubinemia. Int J Lab Hematol 2019; 41 Suppl 1:95-101. [DOI: 10.1111/ijlh.13014] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/27/2019] [Accepted: 03/01/2019] [Indexed: 01/19/2023]
Affiliation(s)
- Anton Rets
- Department of Pathology University of Utah Health Salt Lake City Utah
- ARUP Laboratories Salt Lake City Utah
| | | | - Robert D. Christensen
- Division of Neonatology and Hematology/Oncology University of Utah Health Salt Lake City Utah
| | - Archana M. Agarwal
- Department of Pathology University of Utah Health Salt Lake City Utah
- ARUP Laboratories Salt Lake City Utah
| |
Collapse
|
45
|
Risinger M, Emberesh M, Kalfa TA. Rare Hereditary Hemolytic Anemias: Diagnostic Approach and Considerations in Management. Hematol Oncol Clin North Am 2019; 33:373-392. [PMID: 31030808 DOI: 10.1016/j.hoc.2019.01.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Hereditary hemolytic anemias (HHAs) comprise a heterogeneous group of anemias caused by mutations in genes coding the globins, red blood cell (RBC) membrane proteins, and RBC enzymes. Congenital dyserythropoietic anemias (CDAs) are rare disorders of erythropoiesis characterized by binucleated and multinucleated erythroblasts in bone marrow. CDAs typically present with a hemolytic phenotype, as the produced RBCs have structural defects and decreased survival and should be considered in the differential of HHAs. This article discusses the clinical presentation, laboratory findings, and management considerations for rare HHAs arising from unstable hemoglobins, RBC hydration defects, the less common RBC enzymopathies, and CDAs.
Collapse
Affiliation(s)
- Mary Risinger
- College of Nursing, University of Cincinnati, 3110 Vine Street, Cincinnati, OH 45221-0038, USA
| | - Myesa Emberesh
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, MLC 7018, Cincinnati, OH 45229-3039, USA
| | - Theodosia A Kalfa
- Cancer and Blood Diseases Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, MLC 7015, Cincinnati, OH 45229-3039, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
| |
Collapse
|
46
|
Li Y, Peng GX, Gao QY, Li Y, Ye L, Li JP, Song L, Fan HH, Yang Y, Xiong YZ, Wu ZJ, Yang WR, Zhou K, Zhao X, Jing LP, Zhang FK, Zhang L. [Using target next-generation sequencing assay in diagnosing of 46 patients with suspected congenital anemias]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2019; 39:414-419. [PMID: 29779353 PMCID: PMC7342894 DOI: 10.3760/cma.j.issn.0253-2727.2018.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
目的 评估靶向二代基因测序(NGS)在先天性贫血诊断中的价值。 方法 设计含217个先天性贫血相关致病基因的NGS基因组合——BDHAP-2014,对2014年8月至2017年7月连续就诊的临床怀疑诊断先天性贫血的患者进行NGS检测和亲代验证。 结果 共纳入46例患者,临床疑诊分别为范可尼贫血(FA)11例、先天性红细胞生成异常性贫血(CDA)8例、先天性铁粒幼红细胞性贫血(CSA)6例、先天性溶血性贫血(CHA)12例、先天性角化不良(DC)1例、铁剂难治性缺铁性贫血(IR-IDA)4例及未明原因的血细胞减少(Uc)4例。经靶向NGS检测,28例(60.9%)患者明确了诊断和(或)分型,累及12个基因共44种致病性突变。其中26例(56.5%)基因诊断结果与临床疑诊相符,包括FA(5/11,45.5%)、CSA(6/6,100.0%)、CDA(3/8, 37.5%)及CHA(12/12,100.0%);2例(4.3%)患者的基因诊断结果与临床疑诊不一致,依据NGS纠正了诊断,包括1例DC和1例家族性噬血细胞性淋巴组织细胞增生症(FHL);12例CHA依据基因检查结果进一步明确了溶血类型。18例(39.1%)患者未明确致病基因,最终未能明确诊断。 结论 NGS对临床疑诊先天性贫血患者具有重要的诊断价值,可为临床治疗选择提供依据。
Collapse
Affiliation(s)
- Y Li
- Anemia Therapeutic Center, Institute of Hematology and Blood Diseases Hospital, CAMS & PUMC, Tianjin 300020, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Picard V, Guitton C, Thuret I, Rose C, Bendelac L, Ghazal K, Aguilar-Martinez P, Badens C, Barro C, Bénéteau C, Berger C, Cathébras P, Deconinck E, Delaunay J, Durand JM, Firah N, Galactéros F, Godeau B, Jaïs X, de Jaureguiberry JP, Le Stradic C, Lifermann F, Maffre R, Morin G, Perrin J, Proulle V, Ruivard M, Toutain F, Lahary A, Garçon L. Clinical and biological features in PIEZO1-hereditary xerocytosis and Gardos channelopathy: a retrospective series of 126 patients. Haematologica 2019; 104:1554-1564. [PMID: 30655378 PMCID: PMC6669138 DOI: 10.3324/haematol.2018.205328] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 01/15/2019] [Indexed: 01/16/2023] Open
Abstract
We describe the clinical, hematologic and genetic characteristics of a retrospective series of 126 subjects from 64 families with hereditary xerocytosis. Twelve patients from six families carried a KCNN4 mutation, five had the recurrent p.Arg352His mutation and one had a new deletion at the exon 7-intron 7 junction. Forty-nine families carried a PIEZO1 mutation, which was a known recurrent mutation in only one-third of the cases and private sequence variation in others; 12 new probably pathogenic missense mutations were identified. The two dominant features leading to diagnosis were hemolysis that persisted after splenectomy and hyperferritinemia, with an inconstant correlation with liver iron content assessed by magnetic resonance imaging. PIEZO1-hereditary xerocytosis was characterized by compensated hemolysis in most cases, perinatal edema of heterogeneous severity in more than 20% of families and a major risk of post-splenectomy thrombotic events, including a high frequency of portal thrombosis. In KCNN4-related disease, the main symptoms were more severe anemia, hemolysis and iron overload, with no clear sign of red cell dehydration; therefore, this disorder would be better described as a ‘Gardos channelopathy’. These data on the largest series to date indicate that PIEZO1-hereditary xerocytosis and Gardos channelopathy are not the same disease although they share hemolysis, a high rate of iron overload and inefficient splenectomy. They demonstrate the high variability in clinical expression as well as genetic bases of PIEZO1-hereditary xerocytosis. These results will help to improve the diagnosis of hereditary xerocytosis and to provide recommendations on the clinical management in terms of splenectomy, iron overload and pregnancy follow-up.
Collapse
Affiliation(s)
- Véronique Picard
- Laboratoire d'Hématologie, Center Hospitalier Universitaire (CHU) Bicêtre, Assistance publique - Hôpitaux de Paris (AP-HP), Le Kremlin-Bicêtre.,Université Paris Sud Paris Saclay, Faculté de Pharmacie, Chatenay Malabry
| | - Corinne Guitton
- Service de Pédiatrie Générale, CHU Bicêtre et Filière MCGRE, AP-HP, Le Kremlin-Bicêtre
| | - Isabelle Thuret
- Service de Pédiatrie, Hôpital La Timone, Aix Marseille University, Marseille
| | - Christian Rose
- Service d'Oncologie et d'Hématologie, Hôpital Saint Vincent de Paul, Lille
| | - Laurence Bendelac
- Laboratoire d'Hématologie, Center Hospitalier Universitaire (CHU) Bicêtre, Assistance publique - Hôpitaux de Paris (AP-HP), Le Kremlin-Bicêtre
| | - Kaldoun Ghazal
- Laboratoire de Biochimie, CHU Bicêtre, AP-HP, Le Kremlin-Bicêtre
| | | | | | - Claire Barro
- Laboratoire d'Hématologie Biologique, CHU Grenoble, Grenoble
| | | | - Claire Berger
- Service d'Hématologie-Oncologie Pédiatrique, CHU, Saint-Etienne
| | | | | | | | | | - Nadia Firah
- Service de Pédiatrie, Centre Hospitaliere (CH) Pau
| | - Frédéric Galactéros
- Centre de Référence des Syndromes Drépanocytaires Majeurs, Hôpital Henri-Mondor, AP-HP, Créteil
| | - Bertrand Godeau
- Service de Médecine Interne, CHU Henri Mondor, AP-HP, Créteil
| | - Xavier Jaïs
- Service de Pneumologie, CHU Bicêtre, AP-HP, Le Kremlin-Bicêtre
| | | | | | | | - Robert Maffre
- Laboratoire d'Hématologie, Center Hospitalier Universitaire (CHU) Bicêtre, Assistance publique - Hôpitaux de Paris (AP-HP), Le Kremlin-Bicêtre
| | | | | | - Valérie Proulle
- Laboratoire d'Hématologie, Center Hospitalier Universitaire (CHU) Bicêtre, Assistance publique - Hôpitaux de Paris (AP-HP), Le Kremlin-Bicêtre
| | - Marc Ruivard
- Service de Médecine Interne, CHU Estaing, Clermont-Ferrand
| | | | | | - Loïc Garçon
- Laboratoire d'Hématologie, Center Hospitalier Universitaire (CHU) Bicêtre, Assistance publique - Hôpitaux de Paris (AP-HP), Le Kremlin-Bicêtre .,Equipe d'Accueil 4666 HEMATIM Université de Picardie Jules Verne and Service d'Hématologie Biologique, CHU Amiens, France
| |
Collapse
|
48
|
Andolfo I, Russo R, Rosato BE, Manna F, Gambale A, Brugnara C, Iolascon A. Genotype-phenotype correlation and risk stratification in a cohort of 123 hereditary stomatocytosis patients. Am J Hematol 2018; 93:1509-1517. [PMID: 30187933 DOI: 10.1002/ajh.25276] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 08/31/2018] [Indexed: 01/06/2023]
Abstract
Hereditary stomatocytoses (HSts) are a wide spectrum of hemolytic anemias in which the erythrocyte membrane cation permeability is increased. Dehydrated hereditary stomatocytosis is the most frequent among HSts. It is caused by missense mutations in PIEZO1 and KCNN4 genes. We described 123 patients enrolled in our Genetic Unit from 2013 to 2017. Overall HSt subjects exhibit macrocytic mild anemia. We found that PIEZO1 is the most frequent mutated gene within our families (47% of pedigrees). In 59.1% of cases the mutations localized in the nonpore protein domain, while in 40.9% of patients they localized in the central pore region. The genotype-phenotype correlation analysis on 29 PIEZO1-patients demonstrated that most of severely affected patients carried mutations in the pore domain, suggesting that the severity of this condition is related to the pore properties and intracellular domain that could be responsible of interactions with intracellular components. This is the first cohort study on a large set of hereditary stomatocytosis patients, stratified according to their causative gene useful for diagnosis, prognosis, and management of these patients.
Collapse
Affiliation(s)
- Immacolata Andolfo
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Naples, Italy
- CEINGE Biotecnologie Avanzate, Naples, Italy
| | - Roberta Russo
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Naples, Italy
- CEINGE Biotecnologie Avanzate, Naples, Italy
| | - Barbara Eleni Rosato
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Naples, Italy
- CEINGE Biotecnologie Avanzate, Naples, Italy
| | - Francesco Manna
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Naples, Italy
- CEINGE Biotecnologie Avanzate, Naples, Italy
| | - Antonella Gambale
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Naples, Italy
- CEINGE Biotecnologie Avanzate, Naples, Italy
| | - Carlo Brugnara
- Department of Laboratory Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Achille Iolascon
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Naples, Italy
- CEINGE Biotecnologie Avanzate, Naples, Italy
| |
Collapse
|
49
|
Kaestner L, Egee S. Commentary: Voltage Gating of Mechanosensitive PIEZO Channels. Front Physiol 2018; 9:1565. [PMID: 30524293 PMCID: PMC6256199 DOI: 10.3389/fphys.2018.01565] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 10/18/2018] [Indexed: 11/17/2022] Open
Affiliation(s)
- Lars Kaestner
- Theoretical Medicine and Biosciences, Saarland University, Homburg, Germany.,Experimental Physics, Saarland University, Saarbrücken, Germany
| | - Stephane Egee
- Sorbonne Université, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Roscoff, France.,Laboratoire d'Excellence GR-Ex, Paris, France
| |
Collapse
|
50
|
Lee CH, MacKinnon R. Activation mechanism of a human SK-calmodulin channel complex elucidated by cryo-EM structures. Science 2018; 360:508-513. [PMID: 29724949 DOI: 10.1126/science.aas9466] [Citation(s) in RCA: 123] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 03/16/2018] [Indexed: 12/17/2022]
Abstract
Small-conductance Ca2+-activated K+ (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood cells. Activation of SK channels requires calmodulin (CaM), but how CaM binds and opens SK channels has been unclear. Here we report cryo-electron microscopy (cryo-EM) structures of a human SK4-CaM channel complex in closed and activated states at 3.4- and 3.5-angstrom resolution, respectively. Four CaM molecules bind to one channel tetramer. Each lobe of CaM serves a distinct function: The C-lobe binds to the channel constitutively, whereas the N-lobe interacts with the S4-S5 linker in a Ca2+-dependent manner. The S4-S5 linker, which contains two distinct helices, undergoes conformational changes upon CaM binding to open the channel pore. These structures reveal the gating mechanism of SK channels and provide a basis for understanding SK channel pharmacology.
Collapse
Affiliation(s)
- Chia-Hsueh Lee
- Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, Howard Hughes Medical Institute, 1230 York Avenue, New York, NY 10065, USA
| | - Roderick MacKinnon
- Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, Howard Hughes Medical Institute, 1230 York Avenue, New York, NY 10065, USA.
| |
Collapse
|