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Gołaszewska A, Misztal T, Kazberuk A, Rusak T. Study on the Mechanism of the Adrenaline-Evoked Procoagulant Response in Human Platelets. Int J Mol Sci 2024; 25:2997. [PMID: 38474244 DOI: 10.3390/ijms25052997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 02/23/2024] [Accepted: 03/03/2024] [Indexed: 03/14/2024] Open
Abstract
Adrenaline has recently been found to trigger phosphatidylserine (PS) exposure on blood platelets, resulting in amplification of the coagulation process, but the mechanism is only fragmentarily established. Using a panel of platelet receptors' antagonists and modulators of signaling pathways, we evaluated the importance of these in adrenaline-evoked PS exposure by flow cytometry. Calcium and sodium ion influx into platelet cytosol, after adrenaline treatment, was examined by fluorimetric measurements. We found a strong reduction in PS exposure after blocking of sodium and calcium ion influx via Na+/H+ exchanger (NHE) and Na+/Ca2+ exchanger (NCX), respectively. ADP receptor antagonists produced a moderate inhibitory effect. Substantial limitation of PS exposure was observed in the presence of GPIIb/IIIa antagonist, phosphoinositide-3 kinase (PI3-K) inhibitors, or prostaglandin E1, a cyclic adenosine monophosphate (cAMP)-elevating agent. We demonstrated that adrenaline may develop a procoagulant response in human platelets with the substantial role of ion exchangers (NHE and NCX), secreted ADP, GPIIb/IIIa-dependent outside-in signaling, and PI3-K. Inhibition of the above mechanisms and increasing cytosolic cAMP seem to be the most efficient procedures to control adrenaline-evoked PS exposure in human platelets.
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Affiliation(s)
- Agata Gołaszewska
- Department of General and Experimental Pathology, Medical University of Bialystok, Mickiewicza 2C, 15-230 Bialystok, Poland
| | - Tomasz Misztal
- Department of Physical Chemistry, Medical University of Bialystok, Mickiewicza 2A, 15-369 Bialystok, Poland
| | - Adam Kazberuk
- Department of Medicinal Chemistry, Medical University of Bialystok, Mickiewicza 2D, 15-959 Bialystok, Poland
| | - Tomasz Rusak
- Department of Physical Chemistry, Medical University of Bialystok, Mickiewicza 2A, 15-369 Bialystok, Poland
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Veuthey L, Aliotta A, Bertaggia Calderara D, Pereira Portela C, Alberio L. Mechanisms Underlying Dichotomous Procoagulant COAT Platelet Generation-A Conceptual Review Summarizing Current Knowledge. Int J Mol Sci 2022; 23:ijms23052536. [PMID: 35269679 PMCID: PMC8910683 DOI: 10.3390/ijms23052536] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/19/2022] [Accepted: 02/21/2022] [Indexed: 12/23/2022] Open
Abstract
Procoagulant platelets are a subtype of activated platelets that sustains thrombin generation in order to consolidate the clot and stop bleeding. This aspect of platelet activation is gaining more and more recognition and interest. In fact, next to aggregating platelets, procoagulant platelets are key regulators of thrombus formation. Imbalance of both subpopulations can lead to undesired thrombotic or bleeding events. COAT platelets derive from a common pro-aggregatory phenotype in cells capable of accumulating enough cytosolic calcium to trigger specific pathways that mediate the loss of their aggregating properties and the development of new adhesive and procoagulant characteristics. Complex cascades of signaling events are involved and this may explain why an inter-individual variability exists in procoagulant potential. Nowadays, we know the key agonists and mediators underlying the generation of a procoagulant platelet response. However, we still lack insight into the actual mechanisms controlling this dichotomous pattern (i.e., procoagulant versus aggregating phenotype). In this review, we describe the phenotypic characteristics of procoagulant COAT platelets, we detail the current knowledge on the mechanisms of the procoagulant response, and discuss possible drivers of this dichotomous diversification, in particular addressing the impact of the platelet environment during in vivo thrombus formation.
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Inzulza-Tapia A, Alarcón M. Role of Non-Coding RNA of Human Platelet in Cardiovascular Disease. Curr Med Chem 2021; 29:3420-3444. [PMID: 34967288 DOI: 10.2174/0929867329666211230104955] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 09/12/2021] [Accepted: 11/02/2021] [Indexed: 11/22/2022]
Abstract
Cardiovascular diseases (CVD) are the major cause of death in the world. Numerous genetic studies involving transcriptomic approaches aimed at the detailed understanding of the disease and the development of new therapeutic strategies have been conducted over recent years. There has been an increase in research on platelets, which are implicated in CVD due to their capacity to release regulatory molecules that affect various pathways. Platelets secrete over 500 various kinds of molecules to plasma including large amounts of non-coding (nc) RNA (miRNA, lncRNA or circRNA). These ncRNA correspond to 98% of transcripts that are not translated into proteins as they are important regulators in physiology and disease. Thus, miRNAs can direct protein complexes to mRNAs through base-pairing interactions, thus causing translation blockage or/and transcript degradation. The lncRNAs act via different mechanisms by binding to transcription factors. Finally, circRNAs act as regulators of miRNAs, interfering with their action. Alteration in the repertoire and/or the amount of the platelet-secreted ncRNA can trigger CVD as well as other diseases. NcRNAs can serve as effective biomarkers for the disease or as therapeutic targets due to their disease involvement. In this review, we will focus on the most important ncRNAs that are secreted by platelets (9 miRNA, 9 lncRNA and 5 circRNA), their association with CVD, and the contribution of these ncRNA to CVD risk to better understand the relation between ncRNA of human platelet and CVD.
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Affiliation(s)
- Inzulza-Tapia A
- Department of Clinical Biochemistry and Immunohaematology, Faculty of Health Sciences, Universidad de Talca, Talca, Chile
- Thrombosis Research Center, University of Talca, 2 Norte 685, Talca, Chile
| | - Alarcón M
- Department of Clinical Biochemistry and Immunohaematology, Faculty of Health Sciences, Universidad de Talca, Talca, Chile
- Thrombosis Research Center, University of Talca, 2 Norte 685, Talca, Chile
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Aliotta A, Bertaggia Calderara D, Zermatten MG, Alberio L. Sodium-Calcium Exchanger Reverse Mode Sustains Dichotomous Ion Fluxes Required for Procoagulant COAT Platelet Formation. Thromb Haemost 2020; 121:309-321. [PMID: 33099282 DOI: 10.1055/s-0040-171670] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Procoagulant collagen-and-thrombin (COAT)-activated platelets represent a subpopulation of activated platelets, which retain a coat of prohemostatic proteins and express phosphatidylserine on their surface. Dichotomous intracellular signaling generating procoagulant platelet activity instead of traditional aggregating endpoints is still not fully elucidated. It has been demonstrated that secondary messengers such as calcium and sodium play a critical role in platelet activation. Therefore, we developed a flow cytometric analysis to investigate intracellular ion fluxes simultaneously during generation of aggregating and procoagulant platelets. Human platelets were activated by convulxin-plus-thrombin. Cytosolic calcium, sodium, and potassium ion fluxes were visualized by specific ion probes and analyzed by flow cytometry. We observed high and prolonged intracellular calcium concentration, transient sodium increase, and fast potassium efflux in COAT platelets, whereas aggregating non-COAT platelets rapidly decreased their calcium content, maintaining higher cytosolic sodium, and experiencing lower and slower potassium depletion. Considering these antithetical patterns, we investigated the role of the sodium-calcium exchanger (NCX) during convulxin-plus-thrombin activation. NCX inhibitors, CBDMB and ORM-10103, dose-dependently reduced the global calcium mobilization induced by convulxin-plus-thrombin activation and dose-dependently prevented formation of procoagulant COAT platelets. Our data demonstrate that both NCX modes are used after convulxin-plus-thrombin-induced platelet activation. Non-COAT platelets use forward-mode NCX, thus pumping calcium out and moving sodium in, while COAT platelets rely on reverse NCX function, which pumps additional calcium into the cytosol, by extruding sodium. In conclusion, we described for the first time the critical and dichotomous role of NCX function during convulxin-plus-thrombin-induced platelet activation.
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Affiliation(s)
- Alessandro Aliotta
- Hemostasis and Platelet Research Laboratory, Division of Hematology and Central Hematology Laboratory, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - Debora Bertaggia Calderara
- Hemostasis and Platelet Research Laboratory, Division of Hematology and Central Hematology Laboratory, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - Maxime G Zermatten
- Hemostasis and Platelet Research Laboratory, Division of Hematology and Central Hematology Laboratory, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - Lorenzo Alberio
- Hemostasis and Platelet Research Laboratory, Division of Hematology and Central Hematology Laboratory, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
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Anand P, Harper AGS. Human platelets use a cytosolic Ca 2+ nanodomain to activate Ca 2+-dependent shape change independently of platelet aggregation. Cell Calcium 2020; 90:102248. [PMID: 32629299 DOI: 10.1016/j.ceca.2020.102248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/14/2020] [Accepted: 06/22/2020] [Indexed: 10/24/2022]
Abstract
Human platelets use a rise in cytosolic Ca2+ concentration to activate all stages of thrombus formation, however, how they are able to decode cytosolic Ca2+ signals to trigger each of these independently is unknown. Other cells create local Ca2+ signals to activate Ca2+-sensitive effectors specifically localised to these subcellular regions. However, no previous study has demonstrated that agonist-stimulated human platelets can generate a local cytosolic Ca2+ signal. Platelets possess a structure called the membrane complex (MC) where the main intracellular calcium store, the dense tubular system (DTS), is coupled tightly to an invaginated portion of the plasma membrane called the open canalicular system (OCS). Here we hypothesised that human platelets use a Ca2+ nanodomain created within the MC to control the earliest phases of platelet activation. Dimethyl-BAPTA-loaded human platelets were stimulated with thrombin in the absence of extracellular Ca2+ to isolate a cytosolic Ca2+ nanodomain created by Ca2+ release from the DTS. In the absence of any detectable rise in global cytosolic Ca2+ concentration, thrombin stimulation triggered Na+/Ca2+ exchanger (NCX)-dependent Ca2+ removal into the extracellular space, as well as Ca2+-dependent shape change in the absence of platelet aggregation. The NCX-mediated Ca2+ removal was dependent on the normal localisation of the DTS, and immunofluorescent staining of NCX3 demonstrated its localisation to the OCS, consistent with this Ca2+ nanodomain being formed within the MC. These results demonstrated that human platelets possess a functional Ca2+ nanodomain contained within the MC that can control shape change independently of platelet aggregation.
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Affiliation(s)
- Peterson Anand
- School of Pharmacy and Bioengineering, Keele University, Guy Hilton Research Centre, Thornburrow Drive, Hartshill, Stoke-on-Trent, ST4 7QB, UK
| | - Alan G S Harper
- School of Medicine, Keele University, Keele, Staffordshire, ST5 5BG, UK.
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Batista-Silva H, Dambrós BF, Rodrigues K, Cesconetto PA, Zamoner A, Sousa de Moura KR, Gomes Castro AJ, Van Der Kraak G, Mena Barreto Silva FR. Acute exposure to bis(2-ethylhexyl)phthalate disrupts calcium homeostasis, energy metabolism and induces oxidative stress in the testis of Danio rerio. Biochimie 2020; 175:23-33. [PMID: 32417457 DOI: 10.1016/j.biochi.2020.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 05/05/2020] [Accepted: 05/07/2020] [Indexed: 10/24/2022]
Abstract
Bis(2-ethylhexyl)phthalate (BEHP) negatively affects testicular functions in different animal species, disturbing reproductive physiology and male fertility. The present study investigated the in vitro acute effect of BEHP on the mechanism of action of ionic calcium (Ca2+) homeostasis and energy metabolism. In addition, the effect of BEHP on oxidative stress was studied in vitro and in vivo in the testis of Danio rerio (D. rerio). Testes were treated in vitro for 30 min with 1 μM BEHP for 45Ca2+ influx measurements. Testes were also incubated with 1 μM BEHP for 1 h (in vitro) or 12 h (in vivo) for the measurements of lactate content, 14C-deoxy-d-glucose uptake, lactate dehydrogenase (LDH) and gamma-glutamyl transpeptidase (GGT) activity, total reactive oxygen species (ROS) production and lipid peroxidation. In addition, the effect of BEHP (1 μM) on GGT, glutamic oxaloacetic transferase (GOT) and glutamic pyruvic transferase (GPT) activity in the liver was evaluated after in vivo treatment for 12 h. BEHP disturbs the Ca2+ balance in the testis when given acutely in vitro. BEHP stimulated Ca2+ influx occurs through L-type voltage-dependent Ca2+ channels (L-VDCC), transitory receptor potential vaniloid (TRPV1) channels, reverse-mode Na+/Ca2+ exchanger (NCX) activation and inhibition of sarco/endoplasmic reticulum Ca2+-ATPase (SERCA). BEHP affected energy metabolism in the testis by decreasing the lactate content and LDH activity. In vitro and in vivo acute effects of BEHP promoted oxidative stress by increasing ROS production, lipid peroxidation and GGT activity in the testis. Additionally, BEHP caused liver damage by increasing GPT activity.
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Affiliation(s)
- Hemily Batista-Silva
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Betina Fernanda Dambrós
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Keyla Rodrigues
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Patrícia Acordi Cesconetto
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Ariane Zamoner
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, Santa Catarina, Brazil
| | | | - Allisson Jhonatan Gomes Castro
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Glen Van Der Kraak
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada
| | - Fátima Regina Mena Barreto Silva
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, Santa Catarina, Brazil.
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7
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Aliotta A, Bertaggia Calderara D, Alberio L. Flow Cytometric Monitoring of Dynamic Cytosolic Calcium, Sodium, and Potassium Fluxes Following Platelet Activation. Cytometry A 2020; 97:933-944. [DOI: 10.1002/cyto.a.24017] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 03/23/2020] [Accepted: 03/27/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Alessandro Aliotta
- Hemostasis and Platelet Research Laboratory, Division of Hematology and Central Hematology Laboratory Lausanne University Hospital (CHUV) and University of Lausanne (UNIL) Lausanne Switzerland
| | - Debora Bertaggia Calderara
- Hemostasis and Platelet Research Laboratory, Division of Hematology and Central Hematology Laboratory Lausanne University Hospital (CHUV) and University of Lausanne (UNIL) Lausanne Switzerland
| | - Lorenzo Alberio
- Hemostasis and Platelet Research Laboratory, Division of Hematology and Central Hematology Laboratory Lausanne University Hospital (CHUV) and University of Lausanne (UNIL) Lausanne Switzerland
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8
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9
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Liu B, Zhang B, Huang S, Yang L, Roos CM, Thompson MA, Prakash YS, Zang J, Miller JD, Guo R. Ca 2+ Entry Through Reverse Mode Na +/Ca 2+ Exchanger Contributes to Store Operated Channel-Mediated Neointima Formation After Arterial Injury. Can J Cardiol 2018; 34:791-799. [PMID: 29705161 DOI: 10.1016/j.cjca.2018.01.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 01/16/2018] [Accepted: 01/16/2018] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Na+/Ca2+ exchange (NCX) reversal-mediated Ca2+ entry is a critical pathway for stimulating proliferation in many cell lines. However, the role of reverse-mode NCX1 in neointima formation and atherosclerosis remains unclear. The aims of the present study were to investigate the functional role of NCX1 in the pathogenesis of atherosclerosis and vascular smooth muscle cell (VSMC) proliferation, and to determine the interaction between NCX1 and store depletion in VSMCs. METHODS A rat balloon injury model was established to examine the effect of the knockdown of NCX1 on neointima formation after injury. VSMCs were cultured to verify that NCX1 knockdown suppressed serum-induced VSMC proliferation. RESULTS The results showed that balloon injury induced neointima formation and upregulated NCX1 expression at 7 and 14 days after injury in rat carotid arteries (1.18- and 1.45-fold, respectively). A lentivirus vector expressing short hairpin (sh)RNA against rat NCX1 dramatically downregulated NCX1, proliferating cell nuclear antigen (PCNA) and Ki-67 expression, and suppressed neointima formation in vivo (62% at 7 days and 70% at 14 days). KB-R7943 (an inhibitor of reverse-mode NCX1) and NCX1 knockdown significantly inhibited serum-induced VSMC proliferation (65% at 72 hours and 41% at 72 hours, respectively), determined according to PCNA and Ki-67 expression and cell counting in vitro, and markedly suppressed store depletion-mediated Ca2+ entry and peripheral cytosolic Na+ transients in VSMCs. CONCLUSIONS Reverse-mode NCX1 is activated by store depletion and is required for proliferative VSMC proliferation and neointima formation after arterial injury.
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Affiliation(s)
- Bei Liu
- Department of Obstetrics and Gynecology, Kunming General Hospital, Kunming, Yunnan, China
| | - Bin Zhang
- Division of Cardiovascular Surgery, and Department of Physiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Shiliang Huang
- Department of Cardiology, Kunming General Hospital, Kunming, Yunnan, China
| | - Lixia Yang
- Department of Cardiology, Kunming General Hospital, Kunming, Yunnan, China
| | - Carolyn M Roos
- Division of Cardiovascular Surgery, and Department of Physiology, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Y S Prakash
- Department of Anesthesiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Jie Zang
- Musculoskeletal Tumor Center, Peking University People's Hospital, Peking, China
| | - Jordan D Miller
- Division of Cardiovascular Surgery, and Department of Physiology, Mayo Clinic, Rochester, Minnesota, USA.
| | - Ruiwei Guo
- Department of Cardiology, Kunming General Hospital, Kunming, Yunnan, China.
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10
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Taylor KA, Pugh N. The contribution of zinc to platelet behaviour during haemostasis and thrombosis. Metallomics 2016; 8:144-55. [PMID: 26727074 DOI: 10.1039/c5mt00251f] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Platelets are the primary cellular determinants of haemostasis and pathological thrombus formation leading to myocardial infarction and stroke. Following vascular injury or atherosclerotic plaque rupture, platelets are recruited to sites of damage and undergo activation induced by a variety of soluble and/or insoluble agonists. Platelet activation is a multi-step process culminating in the formation of thrombi, which contribute to the haemostatic process. Zinc (Zn(2+)) is acknowledged as an important signalling molecule in a diverse range of cellular systems, however there is limited understanding of the influence of Zn(2+) on platelet behaviour during thrombus formation. This review evaluates the contributions of exogenous and intracellular Zn(2+) to platelet function and assesses the potential pathophysiological implications of Zn(2+) signalling. We also provide a speculative assessment of the mechanisms by which platelets could respond to changes in extracellular and intracellular Zn(2+) concentration.
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Affiliation(s)
- K A Taylor
- Department of Biomedical and Forensic Sciences, Faculty of Science and Technology, Anglia Ruskin University, Cambridge, CB1 1PT, UK.
| | - N Pugh
- Department of Biomedical and Forensic Sciences, Faculty of Science and Technology, Anglia Ruskin University, Cambridge, CB1 1PT, UK.
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Abstract
Na(+)/Ca(2+) exchangers (NCXs) have traditionally been viewed principally as a means of Ca(2+) removal from non-excitable cells. However there has recently been increasing interest in the operation of NCXs in reverse mode acting as a means of eliciting Ca(2+) entry into these cells. Reverse mode exchange requires a significant change in the normal resting transmembrane ion gradients and membrane potential, which has been suggested to occur principally via the coupling of NCXs to localised Na(+) entry through non-selective cation channels such as canonical transient receptor potential (TRPC) channels. Here we review evidence for functional or physical coupling of NCXs to non-selective cation channels, and how this affects NCX activity in non-excitable cells. In particular we focus on the potential role of nanojunctions, where the close apposition of plasma and intracellular membranes may help create the conditions needed for the generation of localised rises in Na(+) concentration that would be required to trigger reverse mode exchange.
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12
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Up-regulation of megakaryocytic Na+/Ca2+ exchange in klotho-deficient mice. Biochem Biophys Res Commun 2015; 460:177-82. [DOI: 10.1016/j.bbrc.2015.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 03/01/2015] [Indexed: 11/23/2022]
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Yan J, Almilaji A, Schmid E, Elvira B, Shimshek DR, van der Putten H, Wagner CA, Shumilina E, Lang F. Leucine-rich repeat kinase 2-sensitive Na+/Ca2+ exchanger activity in dendritic cells. FASEB J 2015; 29:1701-10. [PMID: 25609428 DOI: 10.1096/fj.14-264028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 12/12/2014] [Indexed: 11/11/2022]
Abstract
Gene variants of the leucine-rich repeat kinase 2 (LRRK2) are associated with susceptibility to Parkinson's disease (PD). Besides brain and periphery, LRRK2 is expressed in various immune cells including dendritic cells (DCs), antigen-presenting cells linking innate and adaptive immunity. However, the function of LRRK2 in the immune system is still incompletely understood. Here, Ca(2+)-signaling was analyzed in DCs isolated from gene-targeted mice lacking lrrk2 (Lrrk2(-/-)) and their wild-type littermates (Lrrk2(+/+)). According to Western blotting, Lrrk2 was expressed in Lrrk2(+/+) DCs but not in Lrrk2(-/-)DCs. Cytosolic Ca(2+) levels ([Ca(2+)]i) were determined utilizing Fura-2 fluorescence and whole cell currents to decipher electrogenic transport. The increase of [Ca(2+)]i following inhibition of sarcoendoplasmatic Ca(2+)-ATPase with thapsigargin (1 µM) in the absence of extracellular Ca(2+) (Ca(2+)-release) and the increase of [Ca(2+)]i following subsequent readdition of extracellular Ca(2+) (SOCE) were both significantly larger in Lrrk2(-/-) than in Lrrk2(+/+) DCs. The augmented increase of [Ca(2+)]i could have been due to impaired Ca(2+) extrusion by K(+)-independent (NCX) and/or K(+)-dependent (NCKX) Na(+)/Ca(2+)-exchanger activity, which was thus determined from the increase of [Ca(2+)]i, (Δ[Ca(2+)]i), and current following abrupt replacement of Na(+) containing (130 mM) and Ca(2+) free (0 mM) extracellular perfusate by Na(+) free (0 mM) and Ca(2+) containing (2 mM) extracellular perfusate. As a result, both slope and peak of Δ[Ca(2+)]i as well as Na(+)/Ca(2+) exchanger-induced current were significantly lower in Lrrk2(-/-) than in Lrrk2(+/+) DCs. A 6 or 24 hour treatment with the LRRK2 inhibitor GSK2578215A (1 µM) significantly decreased NCX1 and NCKX1 transcript levels, significantly blunted Na(+)/Ca(2+)-exchanger activity, and significantly augmented the increase of [Ca(2+)]i following Ca(2+)-release and SOCE. In conclusion, the present observations disclose a completely novel functional significance of LRRK2, i.e., the up-regulation of Na(+)/Ca(2+) exchanger transcription and activity leading to attenuation of Ca(2+)-signals in DCs.
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Affiliation(s)
- Jing Yan
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Ahmad Almilaji
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Evi Schmid
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Bernat Elvira
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Derya R Shimshek
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Herman van der Putten
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Carsten A Wagner
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Ekaterina Shumilina
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
| | - Florian Lang
- *Department of Physiology, University of Tübingen, Tübingen, Germany; Department of Neuroscience, Novartis Institutes for BioMedical Research, Basel, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Contest for Life Foundation, Hamburg, Germany; and Department of Pediatric Surgery and Pediatric Urology, University Children's Hospital Tübingen, Tübingen, Germany
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Towards Understanding the Role of the Na+-Ca2+ Exchanger Isoform 3. Rev Physiol Biochem Pharmacol 2015; 168:31-57. [DOI: 10.1007/112_2015_23] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Jacob PF, Vaz SH, Ribeiro JA, Sebastião AM. P2Y1 receptor inhibits GABA transport through a calcium signalling-dependent mechanism in rat cortical astrocytes. Glia 2014; 62:1211-26. [PMID: 24733747 DOI: 10.1002/glia.22673] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 03/29/2014] [Accepted: 03/31/2014] [Indexed: 12/16/2022]
Abstract
Astrocytes express a variety of purinergic (P2) receptors, involved in astrocytic communication through fast increases in [Ca(2+) ]i . Of these, the metabotropic ATP receptors (P2Y) regulate cytoplasmic Ca(2+) levels through the PLC-PKC pathway. GABA transporters are a substrate for a number of Ca(2+) -related kinases, raising the possibility that calcium signalling in astrocytes impact the control of extracellular levels of the major inhibitory transmitter in the brain. To access this possibility we tested the influence of P2Y receptors upon GABA transport into astrocytes. Mature primary cortical astroglial-enriched cultures expressed functional P2Y receptors, as evaluated through Ca(2+) imaging, being P2Y1 the predominant P2Y receptor subtype. ATP (100 μM, for 1 min) caused an inhibition of GABA transport through either GAT-1 or GAT-3 transporters, decreasing the Vmax kinetic constant. ATP-induced inhibition of GATs activity was still evident in the presence of adenosine deaminase, precluding an adenosine-mediated effect. This, was mimicked by a specific agonist for the P2Y1,12,13 receptor (2-MeSADP). The effect of 2-MeSADP on GABA transport was blocked by the P2 (PPADS) and P2Y1 selective (MRS2179) receptor antagonists, as well as by the PLC inhibitor (U73122). 2-MeSADP failed to inhibit GABA transport in astrocytes where intracellular calcium had been chelated (BAPTA-AM) or where calcium stores were depleted (α-cyclopiazonic acid, CPA). In conclusion, P2Y1 receptors in astrocytes inhibit GABA transport through a mechanism dependent of P2Y1 -mediated calcium signalling, suggesting that astrocytic calcium signalling, which occurs as a consequence of neuronal firing, may operate a negative feedback loop to enhance extracellular levels of GABA.
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Affiliation(s)
- Pedro F Jacob
- Institute of Pharmacology and Neurosciences, Faculty of Medicine, University of Lisbon, Lisbon, Portugal; Neurosciences Unit, Institute of Molecular Medicine University of Lisbon, Lisbon, Portugal
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Cerecedo D, Martínez-Vieyra I, Alonso-Rangel L, Benítez-Cardoza C, Ortega A. Epithelial sodium channel modulates platelet collagen activation. Eur J Cell Biol 2014; 93:127-36. [PMID: 24679405 DOI: 10.1016/j.ejcb.2014.02.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 01/30/2014] [Accepted: 02/24/2014] [Indexed: 12/14/2022] Open
Abstract
Activated platelets adhere to the exposed subendothelial extracellular matrix and undergo a rapid cytoskeletal rearrangement resulting in shape change and release of their intracellular dense and alpha granule contents to avoid hemorrhage. A central step in this process is the elevation of the intracellular Ca(2+) concentration through its release from intracellular stores and on throughout its influx from the extracellular space. The Epithelial sodium channel (ENaC) is a highly selective Na(+) channel involved in mechanosensation, nociception, fluid volume homeostasis, and control of arterial blood pressure. The present study describes the expression, distribution, and participation of ENaC in platelet migration and granule secretion using pharmacological inhibition with amiloride. Our biochemical and confocal analysis in suspended and adhered platelets suggests that ENaC is associated with Intermediate filaments (IF) and with Dystrophin-associated proteins (DAP) via α-syntrophin and β-dystroglycan. Migration assays, quantification of soluble P-selectin, and serotonin release suggest that ENaC is dispensable for migration and alpha and dense granule secretion, whereas Na(+) influx through this channel is fundamental for platelet collagen activation.
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Affiliation(s)
- Doris Cerecedo
- Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía (ENMH), Instituto Politécnico Nacional (IPN), Mexico City, Mexico.
| | - Ivette Martínez-Vieyra
- Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía (ENMH), Instituto Politécnico Nacional (IPN), Mexico City, Mexico
| | - Lea Alonso-Rangel
- Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía (ENMH), Instituto Politécnico Nacional (IPN), Mexico City, Mexico
| | - Claudia Benítez-Cardoza
- Laboratorio de Bioquímica, Escuela Nacional de Medicina y Homeopatía (ENMH), Instituto Politécnico Nacional (IPN), Mexico City, Mexico
| | - Arturo Ortega
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav-IPN), Mexico City, Mexico
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Sharma V, O'Halloran DM. Recent structural and functional insights into the family of sodium calcium exchangers. Genesis 2013; 52:93-109. [PMID: 24376088 DOI: 10.1002/dvg.22735] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 12/04/2013] [Accepted: 12/08/2013] [Indexed: 01/08/2023]
Abstract
Maintenance of calcium homeostasis is necessary for the development and survival of all animals. Calcium ions modulate excitability and bind effectors capable of initiating many processes such as muscular contraction and neurotransmission. However, excessive amounts of calcium in the cytosol or within intracellular calcium stores can trigger apoptotic pathways in cells that have been implicated in cardiac and neuronal pathologies. Accordingly, it is critical for cells to rapidly and effectively regulate calcium levels. The Na(+) /Ca(2+) exchangers (NCX), Na(+) /Ca(2+) /K(+) exchangers (NCKX), and Ca(2+) /Cation exchangers (CCX) are the three classes of sodium calcium antiporters found in animals. These exchanger proteins utilize an electrochemical gradient to extrude calcium. Although they have been studied for decades, much is still unknown about these proteins. In this review, we examine current knowledge about the structure, function, and physiology and also discuss their implication in various developmental disorders. Finally, we highlight recent data characterizing the family of sodium calcium exchangers in the model system, Caenorhabditis elegans, and propose that C. elegans may be an ideal model to complement other systems and help fill gaps in our knowledge of sodium calcium exchange biology.
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Affiliation(s)
- Vishal Sharma
- Department of Biological Sciences, The George Washington University, Washington, DC; Institute for Neuroscience, The George Washington University, Washington, DC
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Sage SO, Pugh N, Farndale RW, Harper AGS. Pericellular Ca(2+) recycling potentiates thrombin-evoked Ca(2+) signals in human platelets. Physiol Rep 2013; 1:e00085. [PMID: 24303163 PMCID: PMC3841026 DOI: 10.1002/phy2.85] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 08/12/2013] [Indexed: 01/16/2023] Open
Abstract
We have previously demonstrated that Na(+)/Ca(2+) exchangers (NCXs) potentiate Ca(2+) signaling evoked by thapsigargin in human platelets, via their ability to modulate the secretion of autocoids from dense granules. This link was confirmed in platelets stimulated with the physiological agonist, thrombin, and experiments were performed to examine how Ca(2+) removal by the NCX modulates platelet dense granule secretion. In cells loaded with the near-membrane indicator FFP-18, thrombin stimulation was observed to elicit an NCX-dependent accumulation of Ca(2+) in a pericellular region around the platelets. To test whether this pericellular Ca(2+) accumulation might be responsible for the influence of NCXs over platelet function, platelets were exposed to fast Ca(2+) chelators or had their glycocalyx removed. Both manipulations of the pericellular Ca(2+) rise reduced thrombin-evoked Ca(2+) signals and dense granule secretion. Blocking Ca(2+)-permeable ion channels had a similar effect, suggesting that Ca(2+) exported into the pericellular region is able to recycle back into the platelet cytosol. Single cell imaging with extracellular Fluo-4 indicated that thrombin-evoked rises in extracellular [Ca(2+)] occurred within the boundary described by the cell surface, suggesting their presence within the open canalicular system (OCS). FFP-18 fluorescence was similarly distributed. These data suggest that upon thrombin stimulation, NCX activity creates a rise in [Ca(2+)] within the pericellular region of the platelet from where it recycles back into the platelet cytosol, acting to both accelerate dense granule secretion and maintain the initial rise in cytosolic [Ca(2+)].
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Affiliation(s)
- Stewart O Sage
- Department of Physiology, Development and Neuroscience, University of Cambridge Cambridge, U.K
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Mahaut-Smith MP. A Role for Platelet TRPC Channels in the Ca2+ Response That Induces Procoagulant Activity. Sci Signal 2013; 6:pe23. [DOI: 10.1126/scisignal.2004399] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Functional and structural properties of the NCKX2 Na(+)-Ca (2+)/K (+) exchanger: a comparison with the NCX1 Na (+)/Ca (2+) exchanger. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 961:81-94. [PMID: 23224872 DOI: 10.1007/978-1-4614-4756-6_8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Na(+)/Ca(2+)-K(+) exchangers (NCKX), alongside the more widely known Na(+)/Ca(2+) exchangers (NCX), are important players in the cellular Ca(2+) toolkit. But, unlike NCX, much less is known about the physiological roles of NCKX, while emergent evidence indicates that NCKX has highly specialized functions in cells and tissues where it is expressed. As their name implies, there are functional similarities in the properties of the two Ca(2+) exchanger families, but there are specific differences as well. Here, we compare and contrast their key functional properties of ionic dependence and affinities, as well as report on the effects of KB-R7943 - a compound that is widely used to differentiate the two exchangers. We also review structural similarities and differences between the two exchangers. The aim is to draw attention to key differences that will aid in differentiating the two exchangers in physiological contexts where both exist but perhaps play distinct roles.
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Chang CJ, Chen YC, Kao YH, Lin YK, Chen SA, Chen YJ. Dabigatran and Thrombin Modulate Electrophysiological Characteristics of Pulmonary Vein and Left Atrium. Circ Arrhythm Electrophysiol 2012; 5:1176-83. [DOI: 10.1161/circep.112.971556] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Chien-Jung Chang
- From the Graduate Institute of Clinical Medicine, College of Medicine (C-J.C., Y-K.L., Y-J.C.), Department of Medical Education and Research, Wan Fang Hospital (Y-H.K.), and Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital (Y-K.L., Y-J.C.), Taipei Medical University, Taipei, Taiwan; Division of Cardiology, Tungs’ Taichung Metroharbour Hospital, Taichung, Taiwan (C-J.C.); Department of Biomedical Engineering and Institute of Physiology, National Defense Medical
| | - Yao-Chang Chen
- From the Graduate Institute of Clinical Medicine, College of Medicine (C-J.C., Y-K.L., Y-J.C.), Department of Medical Education and Research, Wan Fang Hospital (Y-H.K.), and Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital (Y-K.L., Y-J.C.), Taipei Medical University, Taipei, Taiwan; Division of Cardiology, Tungs’ Taichung Metroharbour Hospital, Taichung, Taiwan (C-J.C.); Department of Biomedical Engineering and Institute of Physiology, National Defense Medical
| | - Yu-Hsun Kao
- From the Graduate Institute of Clinical Medicine, College of Medicine (C-J.C., Y-K.L., Y-J.C.), Department of Medical Education and Research, Wan Fang Hospital (Y-H.K.), and Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital (Y-K.L., Y-J.C.), Taipei Medical University, Taipei, Taiwan; Division of Cardiology, Tungs’ Taichung Metroharbour Hospital, Taichung, Taiwan (C-J.C.); Department of Biomedical Engineering and Institute of Physiology, National Defense Medical
| | - Yung-Kuo Lin
- From the Graduate Institute of Clinical Medicine, College of Medicine (C-J.C., Y-K.L., Y-J.C.), Department of Medical Education and Research, Wan Fang Hospital (Y-H.K.), and Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital (Y-K.L., Y-J.C.), Taipei Medical University, Taipei, Taiwan; Division of Cardiology, Tungs’ Taichung Metroharbour Hospital, Taichung, Taiwan (C-J.C.); Department of Biomedical Engineering and Institute of Physiology, National Defense Medical
| | - Shih-Ann Chen
- From the Graduate Institute of Clinical Medicine, College of Medicine (C-J.C., Y-K.L., Y-J.C.), Department of Medical Education and Research, Wan Fang Hospital (Y-H.K.), and Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital (Y-K.L., Y-J.C.), Taipei Medical University, Taipei, Taiwan; Division of Cardiology, Tungs’ Taichung Metroharbour Hospital, Taichung, Taiwan (C-J.C.); Department of Biomedical Engineering and Institute of Physiology, National Defense Medical
| | - Yi-Jen Chen
- From the Graduate Institute of Clinical Medicine, College of Medicine (C-J.C., Y-K.L., Y-J.C.), Department of Medical Education and Research, Wan Fang Hospital (Y-H.K.), and Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital (Y-K.L., Y-J.C.), Taipei Medical University, Taipei, Taiwan; Division of Cardiology, Tungs’ Taichung Metroharbour Hospital, Taichung, Taiwan (C-J.C.); Department of Biomedical Engineering and Institute of Physiology, National Defense Medical
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