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Catalán M, González-Herrera F, Maya JD, Lorenzo O, Pedrozo Z, Olmedo I, Suarez-Rozas C, Molina-Berrios A, Díaz-Araya G, Vivar R. Boldine prevents the inflammatory response of cardiac fibroblasts induced by SGK1-NFκB signaling pathway activation. Cell Signal 2024; 120:111241. [PMID: 38825173 DOI: 10.1016/j.cellsig.2024.111241] [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: 02/10/2024] [Revised: 05/14/2024] [Accepted: 05/29/2024] [Indexed: 06/04/2024]
Abstract
Cardiac fibroblasts (CF) are mesenchymal-type cells responsible for maintaining the homeostasis of the heart's extracellular matrix (ECM). Their dysfunction leads to excessive secretion of ECM proteins, tissue stiffening, impaired nutrient and oxygen exchange, and electrical abnormalities in the heart. Additionally, CF act as sentinel cells in the cardiac tissue microenvironment, responding to various stimuli that may affect heart function. Deleterious stimuli induce an inflammatory response in CF, increasing the secretion of cytokines such as IL-1β and TNF-α and the expression of cell adhesion molecules like ICAM1 and VCAM1, initially promoting damage resolution by recruiting immune cells. However, constant harmful stimuli lead to a chronic inflammatory process and heart dysfunction. Therefore, it is necessary to study the mechanisms that govern CF inflammation. NFκB is a key regulator of the cardiac inflammatory process, making the search for mechanisms of NFκB regulation and CF inflammatory response crucial for developing new treatment options for cardiovascular diseases. SGK1, a serine-threonine protein kinase, is one of the regulators of NFκB and is involved in the fibrotic effects of angiotensin II and aldosterone, as well as in CF differentiation. However, its role in the CF inflammatory response is unknown. On the other hand, many bioactive natural products have demonstrated anti-inflammatory effects, but their role in CF inflammation is unknown. One such molecule is boldine, an alkaloid obtained from Boldo (Peumus boldus), a Chilean endemic tree with proven cytoprotective effects. However, its involvement in the regulation of SGK1 and CF inflammation is unknown. In this study, we evaluated the role of SGK1 and boldine in the inflammatory response in CF isolated from neonatal Sprague-Dawley rats. The involvement of SGK1 was analyzed using GSK650394, a specific SGK1 inhibitor. Our results demonstrate that SGK1 is crucial for LPS- and IFN-γ-induced inflammatory responses in CF (cytokine expression, cell adhesion molecule expression, and leukocyte adhesion). Furthermore, a conditioned medium (intracellular content of CF subject to freeze/thaw cycles) was used to simulate a sterile inflammation condition. The conditioned medium induced a potent inflammatory response in CF, which was completely prevented by the SGK1 inhibitor. Finally, our results indicate that boldine inhibits both SGK1 activation and the CF inflammatory response induced by LPS, IFN-γ, and CF-conditioned medium. Taken together, our results position SGK1 as an important regulator of the CF inflammatory response and boldine as a promising anti-inflammatory drug in the context of cardiovascular diseases.
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Affiliation(s)
- M Catalán
- Biomedical Science Institute, Faculty of Medicine, University of Chile, Santiago, Chile
| | - F González-Herrera
- Biomedical Science Institute, Faculty of Medicine, University of Chile, Santiago, Chile
| | - J D Maya
- Biomedical Science Institute, Faculty of Medicine, University of Chile, Santiago, Chile
| | - O Lorenzo
- IIS-Fundación Jiménez Díaz, Faculty of Medicine, Universidad Autónoma de Madrid, Spain
| | - Z Pedrozo
- Biomedical Science Institute, Faculty of Medicine, University of Chile, Santiago, Chile
| | - I Olmedo
- Biomedical Science Institute, Faculty of Medicine, University of Chile, Santiago, Chile
| | - C Suarez-Rozas
- Medicinal Chemistry Center, Faculty of Medicine, Clínica Alemana, Universidad del Desarrollo, Santiago, Chile
| | - A Molina-Berrios
- Institute for Research in Dental Sciences (ICOD), Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | - G Díaz-Araya
- Department of Pharmacological & Toxicological Chemistry, Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine, University of Chile, Santiago, Chile
| | - R Vivar
- Biomedical Science Institute, Faculty of Medicine, University of Chile, Santiago, Chile; Department of Pharmacological & Toxicological Chemistry, Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine, University of Chile, Santiago, Chile.
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2
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Ren R, Li Y. STIM1 in tumor cell death: angel or devil? Cell Death Discov 2023; 9:408. [PMID: 37932320 PMCID: PMC10628139 DOI: 10.1038/s41420-023-01703-8] [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: 05/16/2023] [Revised: 10/21/2023] [Accepted: 10/27/2023] [Indexed: 11/08/2023] Open
Abstract
Stromal interaction molecule 1 (STIM1) is involved in mediating the store-operated Ca2+ entry (SOCE), driving the influx of the intracellular second messenger calcium ion (Ca2+), which is closely associated with tumor cell proliferation, metastasis, apoptosis, autophagy, metabolism and immune processes. STIM1 is not only regulated at the transcriptional level by NF-κB and HIF-1, but also post-transcriptionally modified by miRNAs and degraded by ubiquitination. Recent studies have shown that STIM1 or Ca2+ signaling can regulate apoptosis, autophagy, pyroptosis, and ferroptosis in tumor cells and act discrepantly in different cancers. Furthermore, STIM1 contributes to resistance against antitumor therapy by influencing tumor cell death. Further investigation into the mechanisms through which STIM1 controls other forms of tumor cell death could aid in the discovery of novel therapeutic targets. Moreover, STIM1 has the ability to regulate immune cells within the tumor microenvironment. Here, we review the basic structure, function and regulation of STIM1, summarize the signaling pathways through which STIM1 regulates tumor cell death, and propose the prospects of antitumor therapy by targeting STIM1.
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Affiliation(s)
- Ran Ren
- Chongqing University Cancer Hospital, School of Medicine, Chongqing University, 400044, Chongqing, China
| | - Yongsheng Li
- Chongqing University Cancer Hospital, School of Medicine, Chongqing University, 400044, Chongqing, China.
- Department of Medical Oncology, Chongqing University Cancer Hospital, 400030, Chongqing, China.
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3
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Arzehgar A, Davarinia F, Ferns GA, Hakimi A, Bahrami A. Predicting the Cognitive Ability of Young Women Using a New Feature Selection Algorithm. J Mol Neurosci 2023; 73:678-691. [PMID: 37581703 DOI: 10.1007/s12031-023-02145-8] [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: 02/16/2022] [Accepted: 07/26/2023] [Indexed: 08/16/2023]
Abstract
Cognitive abilities are the capabilities to perform mental processes that include executive function, comprehension, decision-making, work performance, and educational attainment. This study aimed to investigate the relationship between several biomarkers and individuals' cognitive ability using various machine learning methods. A total of 144 young women aged between 18 and 24 years old were recruited into the study. Cognitive performance was assessed using a standard questionnaire. A panel of biochemical, hematological, inflammatory, and oxidative stress biomarkers in serum and urine was measured for all participants. A novel combination of feature selection and feature scoring techniques within a hierarchical ensemble structure has been proposed to identify the most effective features in recognizing the importance of various biomarker signatures in cognitive abilities classification. Multiple feature selection methods were employed in conjunction with different classifiers to construct this model. In this manner, using three filter methods, the scores of each feature were considered. The combination of high-scoring features for each filter method was stored as the primary feature subset. A high-accuracy feature subset was selected by using a wrapper method. The collection of highly scored features from each filter method formed the primary feature subset. A wrapper method was also employed to select a feature subset with high accuracy. To ensure robustness and minimize random variations in the feature subset search process, a repeative tenfold cross-validation was conducted. The most frequently recurring features were determined. This iterative step facilitated the identification of an optimal feature subset, effectively reducing the dimensionality of features while maintaining accuracy. Among the 47 extracted factors, serum level of NOx (nitrite ± nitrate), alkaline phosphatase (ALP), and phosphate as well as blood platelet count (PLT) was entered into the model of cognitive abilities with the highest accuracy of approximately 70.9% using a decision tree classifier. Therefore, the serum levels of NOx, ALP, phosphate, and blood PLT count may be important markers of the cognitive abilities in apparently healthy young women. These factors my provide a simple procedure to identify mental abilities and earlier cognitive decline in healthy adults.
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Affiliation(s)
- Afrooz Arzehgar
- Department of Medical Informatics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Gordon A Ferns
- Brighton & Sussex Medical School, Department of Medical Education, Falmer, Brighton, BN1 9PH, Sussex, UK
| | - Ali Hakimi
- Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Afsane Bahrami
- Clinical Research Development Unit, Faculty of Medicine, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
- Clinical Research Development Unit of Akbar Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
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4
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Cheung HYF, Zou J, Tantiwong C, Fernandez DI, Huang J, Ahrends R, Roest M, Cavill R, Gibbins J, Heemskerk JWM. High-throughput assessment identifying major platelet Ca 2+ entry pathways via tyrosine kinase-linked and G protein-coupled receptors. Cell Calcium 2023; 112:102738. [PMID: 37060673 DOI: 10.1016/j.ceca.2023.102738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 03/04/2023] [Accepted: 04/06/2023] [Indexed: 04/17/2023]
Abstract
In platelets, elevated cytosolic Ca2+ is a crucial second messenger, involved in most functional responses, including shape change, secretion, aggregation and procoagulant activity. The platelet Ca2+ response consists of Ca2+ mobilization from endoplasmic reticulum stores, complemented with store-operated or receptor-operated Ca2+ entry pathways. Several channels can contribute to the Ca2+ entry, but their relative contribution is unclear upon stimulation of ITAM-linked receptors such as glycoprotein VI (GPVI) and G-protein coupled receptors such as the protease-activated receptors (PAR) for thrombin. We employed a 96-well plate high-throughput assay with Fura-2-loaded human platelets to perform parallel [Ca2+]i measurements in the presence of EGTA or CaCl2. Per agonist condition, this resulted in sets of EGTA, CaCl2 and Ca2+ entry ratio curves, defined by six parameters, reflecting different Ca2+ ion fluxes. We report that threshold stimulation of GPVI or PAR, with a variable contribution of secondary mediators, induces a maximal Ca2+ entry ratio of 3-7. Strikingly, in combination with Ca2+-ATPase inhibition by thapsigargin, the maximal Ca2+ entry ratio increased to 400 (GPVI) or 40 (PAR), pointing to a strong receptor-dependent enhancement of store-operated Ca2+ entry. By pharmacological blockage of specific Ca2+ channels in platelets, we found that, regardless of GPVI or PAR stimulation, the Ca2+ entry ratio was strongest affected by inhibition of ORAI1 (2-APB, Synta66) > Na+/Ca2+ exchange (NCE) > P2×1 (only initial). In contrast, inhibition of TRPC6, Piezo1/2 or STIM1 was without effect. Together, these data reveal ORAI1 and NCE as dominating Ca2+ carriers regulating GPVI- and PAR-induced Ca2+ entry in human platelets.
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Affiliation(s)
- Hilaire Yam Fung Cheung
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V, Dortmund, Germany; Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Jinmi Zou
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Synapse Research Institute Maastricht, 6217 KD Maastricht, The Netherlands
| | - Chukiat Tantiwong
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Institute for Cardiovascular and Metabolic Research (ICMR), School of Biological Sciences, University of Reading, Reading, United Kingdom
| | - Delia I Fernandez
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidade de Santiago de Compostela, Santiago de Compostela, 15706, Spain
| | - Jingnan Huang
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V, Dortmund, Germany; Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidade de Santiago de Compostela, Santiago de Compostela, 15706, Spain
| | - Robert Ahrends
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V, Dortmund, Germany; Dept. of Analytical Chemistry, University of Vienna, Vienna, Austria
| | - Mark Roest
- Synapse Research Institute Maastricht, 6217 KD Maastricht, The Netherlands
| | - Rachel Cavill
- Department of Advanced Computing Sciences, Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Jon Gibbins
- Institute for Cardiovascular and Metabolic Research (ICMR), School of Biological Sciences, University of Reading, Reading, United Kingdom
| | - Johan W M Heemskerk
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Synapse Research Institute Maastricht, 6217 KD Maastricht, The Netherlands.
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5
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Mindukshev I, Fock E, Dobrylko I, Sudnitsyna J, Gambaryan S, Panteleev MA. Platelet Hemostasis Reactions at Different Temperatures Correlate with Intracellular Calcium Concentration. Int J Mol Sci 2022; 23:ijms231810667. [PMID: 36142580 PMCID: PMC9505593 DOI: 10.3390/ijms231810667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/05/2022] [Accepted: 09/05/2022] [Indexed: 11/22/2022] Open
Abstract
Hypo- and hyperthermia affect both primary and secondary hemostasis; however, there are controversial data concerning platelet activation and the underlying mechanisms under hypo- and hyperthermia. The discrepancies in the data could be partly explained by different approaches to hemostatic reactions analysis. We applied a new LaSca-TMF laser particle analyzer for a simultaneous fluorescence and laser scattering analysis of platelet responses at different temperatures. Human platelets were activated by ADP in a wide range of temperatures, and platelet transformations (e.g., a shape change reaction, aggregation and clot formation) and the intracellular calcium concentration ([Ca2+]i) were analyzed by LaSca-TMF and confocal microscopy. The platelet shape change reaction gradually increased with a rising temperature. The platelet aggregation strongly decreased at low ADP concentrations with the augmentation of the temperature and was independent of the temperature at high ADP concentrations. In contrast, the clotting time decreased with a temperature increase. Similar to the aggregation response, a rise in [Ca2+]i triggered by low ADP concentrations was higher under hypothermic conditions and the differences were independent of the temperature at high ADP concentrations. We showed that the key reactions of cellular hemostasis are differentially regulated by temperature and demonstrated for the first time that an accelerated aggregation under hypothermic conditions directly correlated with an increased level in [Ca2+]i in platelets.
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Affiliation(s)
- Igor Mindukshev
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez Ave., 194223 Saint Petersburg, Russia
| | - Ekaterina Fock
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez Ave., 194223 Saint Petersburg, Russia
| | - Irina Dobrylko
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez Ave., 194223 Saint Petersburg, Russia
| | - Julia Sudnitsyna
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez Ave., 194223 Saint Petersburg, Russia
- Center for Theoretical Problems of Physicochemical Pharmacology, Russian Academy of Sciences, 30 Srednyaya Kalitnikovskaya St., 109029 Moscow, Russia
| | - Stepan Gambaryan
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 Thorez Ave., 194223 Saint Petersburg, Russia
- Correspondence: (S.G.); (M.A.P.)
| | - Mikhail A. Panteleev
- Center for Theoretical Problems of Physicochemical Pharmacology, Russian Academy of Sciences, 30 Srednyaya Kalitnikovskaya St., 109029 Moscow, Russia
- Correspondence: (S.G.); (M.A.P.)
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6
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Abstract
Store-operated Ca2+ entry (SOCE) is a ubiquitous Ca2+ signaling pathway that is evolutionarily conserved across eukaryotes. SOCE is triggered physiologically when the endoplasmic reticulum (ER) Ca2+ stores are emptied through activation of inositol 1,4,5-trisphosphate receptors. SOCE is mediated by the Ca2+ release-activated Ca2+ (CRAC) channels, which are highly Ca2+ selective. Upon store depletion, the ER Ca2+-sensing STIM proteins aggregate and gain extended conformations spanning the ER-plasma membrane junctional space to bind and activate Orai, the pore-forming proteins of hexameric CRAC channels. In recent years, studies on STIM and Orai tissue-specific knockout mice and gain- and loss-of-function mutations in humans have shed light on the physiological functions of SOCE in various tissues. Here, we describe recent findings on the composition of native CRAC channels and their physiological functions in immune, muscle, secretory, and neuronal systems to draw lessons from transgenic mice and human diseases caused by altered CRAC channel activity.
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Affiliation(s)
- Scott M Emrich
- Department of Cellular and Molecular Physiology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA;
| | - Ryan E Yoast
- Department of Cellular and Molecular Physiology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA;
| | - Mohamed Trebak
- Department of Cellular and Molecular Physiology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA;
- Department of Pharmacology and Chemical Biology and Vascular Medicine Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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7
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Relevance of stromal interaction molecule 1 (STIM1) in experimental and human stroke. Pflugers Arch 2021; 474:141-153. [PMID: 34757454 DOI: 10.1007/s00424-021-02636-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 10/20/2021] [Accepted: 10/28/2021] [Indexed: 10/19/2022]
Abstract
Stroke represents a main cause of death and permanent disability worldwide. In the attempt to develop targeted preventive and therapeutic strategies, several efforts were performed over the last decades to identify the specific molecular abnormalities preceding cerebral ischemia and neuronal death. In this regard, mitochondrial dysfunction, autophagy, and intracellular calcium homeostasis appear important contributors to stroke development, as underscored by recent pre-clinical evidence. Intracellular calcium (Ca2+) homeostasis is regulated, among other mechanisms, by the calcium sensor stromal interaction molecule 1 (STIM1) and calcium release-activated calcium modulator (ORAI) members, which mediate the store-operated Ca2+ entry (SOCE). The activity of SOCE is deregulated in animal models of ischemic stroke, leading to ischemic injury exacerbation. We found a different pattern of expression of few SOCE components, dependent from a STIM1 mutation, in cerebral endothelial cells isolated from the stroke-prone spontaneously hypertensive rat (SHRSP), compared to the stroke-resistant (SHRSR) strain, suggesting a potential involvement of this mechanism into the stroke predisposition of SHRSP. In this article, we discuss the relevant role of STIM1 in experimental stroke, as highlighted by the current literature and by our recent experimental findings, and the available evidence in the human disease. We also provide a glance on future perspectives and clinical implications of STIM1.
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8
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Braga L, Ali H, Secco I, Chiavacci E, Neves G, Goldhill D, Penn R, Jimenez-Guardeño JM, Ortega-Prieto AM, Bussani R, Cannatà A, Rizzari G, Collesi C, Schneider E, Arosio D, Shah AM, Barclay WS, Malim MH, Burrone J, Giacca M. Drugs that inhibit TMEM16 proteins block SARS-CoV-2 spike-induced syncytia. Nature 2021; 594:88-93. [PMID: 33827113 PMCID: PMC7611055 DOI: 10.1038/s41586-021-03491-6] [Citation(s) in RCA: 253] [Impact Index Per Article: 84.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 03/25/2021] [Indexed: 02/01/2023]
Abstract
COVID-19 is a disease with unique characteristics that include lung thrombosis1, frequent diarrhoea2, abnormal activation of the inflammatory response3 and rapid deterioration of lung function consistent with alveolar oedema4. The pathological substrate for these findings remains unknown. Here we show that the lungs of patients with COVID-19 contain infected pneumocytes with abnormal morphology and frequent multinucleation. The generation of these syncytia results from activation of the SARS-CoV-2 spike protein at the cell plasma membrane level. On the basis of these observations, we performed two high-content microscopy-based screenings with more than 3,000 approved drugs to search for inhibitors of spike-driven syncytia. We converged on the identification of 83 drugs that inhibited spike-mediated cell fusion, several of which belonged to defined pharmacological classes. We focused our attention on effective drugs that also protected against virus replication and associated cytopathicity. One of the most effective molecules was the antihelminthic drug niclosamide, which markedly blunted calcium oscillations and membrane conductance in spike-expressing cells by suppressing the activity of TMEM16F (also known as anoctamin 6), a calcium-activated ion channel and scramblase that is responsible for exposure of phosphatidylserine on the cell surface. These findings suggest a potential mechanism for COVID-19 disease pathogenesis and support the repurposing of niclosamide for therapy.
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Affiliation(s)
- Luca Braga
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
| | - Hashim Ali
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
| | - Ilaria Secco
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
| | - Elena Chiavacci
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
| | - Guilherme Neves
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Centre for Developmental Neurobiology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Daniel Goldhill
- Department of Infectious Diseases, Imperial College London, London, UK
| | - Rebecca Penn
- Department of Infectious Diseases, Imperial College London, London, UK
| | - Jose M Jimenez-Guardeño
- Department of Infectious Diseases, School of Immunology & Microbial Sciences, King's College London, London, UK
| | - Ana M Ortega-Prieto
- Department of Infectious Diseases, School of Immunology & Microbial Sciences, King's College London, London, UK
| | - Rossana Bussani
- Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy
| | - Antonio Cannatà
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
| | - Giorgia Rizzari
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
| | - Chiara Collesi
- Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy
- International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Edoardo Schneider
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
- International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Daniele Arosio
- Istituto di Biofisica (IBF), Consiglio Nazionale delle Ricerche (CNR), Trento, Italy
| | - Ajay M Shah
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK
| | - Wendy S Barclay
- Department of Infectious Diseases, Imperial College London, London, UK
| | - Michael H Malim
- Department of Infectious Diseases, School of Immunology & Microbial Sciences, King's College London, London, UK
| | - Juan Burrone
- MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Centre for Developmental Neurobiology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Mauro Giacca
- King's College London, British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, London, UK.
- Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy.
- International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy.
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Pérez-Niño JJ, Barros-García G, Garcés MF, Caminos JE, Brion M, Beltrán-Dussán EH. Molecular study of sticky platelet syndrome using exome sequencing. REVISTA DE LA FACULTAD DE MEDICINA 2021. [DOI: 10.15446/revfacmed.v69n3.76806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Introduction: Sticky platelet syndrome (SPS) is a prothrombotic condition characterized by increased platelet aggregation that causes arterial and venous thrombosis. Its diagnosis is reached by identifying increased aggregation using low concentrations of adenosine diphosphate and epinephrine in platelet aggregation tests.
Objectives: To identify common mutations through exome sequencing in two patients from the same family diagnosed with SPS and, thus, contribute to the molecular study of this disease.
Materials and methods: Descriptive study. In January 2018, exome sequencing was performed in a 10-year-old patient treated at Fundación HOMI (Bogotá D.C., Colombia), index case, and in one of his adult first-degree relatives, both with a history of thrombotic disease and diagnosed with SPS. Exome sequencing was performed at the Complexo Hospitalario Universitario de Santiago de Compostela (Spain) using the SureSelect Clinical Research Exome V2 software by Agilent.
Results: Exome sequencing led to detect genetic variants in both cases when compared with the reference sequence. The following variant was identified in the two samples: a cytosine to thymine transition at position c.236 (NM_000174.4) of the glycoprotein (GP)Ib-IX-V complex platelet membrane receptor, which causes a heterozygous transition of the amino acid threonine to isoleucine (i.e., a transition from hydrophilic amino acid to a hydrophobic amino acid) at position p. 79 of the extracellular leucine-rich repeat domain of GPIbα subunit of the (GP)Ib–IX complex, involving a conformational change of the main receptor of ligands IB alpha, which might result in platelet hyperaggregation and thrombosis. This variant has not been described in patients with SPS to date.
Conclusion: The mutation identified in both samples could be related to SPS considering the importance of glycoprotein IX in platelet function.
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10
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Zhou K, Zhu X, Ma K, Liu J, Nürnberg B, Gawaz M, Lang F. Effect of MgCl 2 and GdCl 3 on ORAI1 Expression and Store-Operated Ca 2+ Entry in Megakaryocytes. Int J Mol Sci 2021; 22:ijms22073292. [PMID: 33804889 PMCID: PMC8036595 DOI: 10.3390/ijms22073292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 03/14/2021] [Accepted: 03/18/2021] [Indexed: 01/07/2023] Open
Abstract
In chronic kidney disease, hyperphosphatemia upregulates the Ca2+ channel ORAI and its activating Ca2+ sensor STIM in megakaryocytes and platelets. ORAI1 and STIM1 accomplish store-operated Ca2+ entry (SOCE) and play a key role in platelet activation. Signaling linking phosphate to upregulation of ORAI1 and STIM1 includes transcription factor NFAT5 and serum and glucocorticoid-inducible kinase SGK1. In vascular smooth muscle cells, the effect of hyperphosphatemia on ORAI1/STIM1 expression and SOCE is suppressed by Mg2+ and the calcium-sensing receptor (CaSR) agonist Gd3+. The present study explored whether sustained exposure to Mg2+ or Gd3+ interferes with the phosphate-induced upregulation of NFAT5, SGK1, ORAI1,2,3, STIM1,2 and SOCE in megakaryocytes. To this end, human megakaryocytic Meg-01 cells were treated with 2 mM ß-glycerophosphate for 24 h in the absence and presence of either 1.5 mM MgCl2 or 50 µM GdCl3. Transcript levels were estimated utilizing q-RT-PCR, protein abundance by Western blotting, cytosolic Ca2+ concentration ([Ca2+]i) by Fura-2 fluorescence and SOCE from the increase in [Ca2+]i following re-addition of extracellular Ca2+ after store depletion with thapsigargin (1 µM). As a result, Mg2+ and Gd3+ upregulated CaSR and blunted or virtually abolished the phosphate-induced upregulation of NFAT5, SGK1, ORAI1,2,3, STIM1,2 and SOCE in megakaryocytes. In conclusion, Mg2+ and the CaSR agonist Gd3+ interfere with phosphate-induced dysregulation of [Ca2+]i in megakaryocytes.
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Affiliation(s)
- Kuo Zhou
- Department of Pharmacology, Experimental Therapy & Toxicology, Eberhard Karls University, 72074 Tübingen, Germany; (K.Z.); (X.Z.); (K.M.); (B.N.)
| | - Xuexue Zhu
- Department of Pharmacology, Experimental Therapy & Toxicology, Eberhard Karls University, 72074 Tübingen, Germany; (K.Z.); (X.Z.); (K.M.); (B.N.)
| | - Ke Ma
- Department of Pharmacology, Experimental Therapy & Toxicology, Eberhard Karls University, 72074 Tübingen, Germany; (K.Z.); (X.Z.); (K.M.); (B.N.)
| | - Jibin Liu
- Institute of Preventive Veterinary Medicine, Key Laboratory of Animal Disease and Human Health of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China;
| | - Bernd Nürnberg
- Department of Pharmacology, Experimental Therapy & Toxicology, Eberhard Karls University, 72074 Tübingen, Germany; (K.Z.); (X.Z.); (K.M.); (B.N.)
| | - Meinrad Gawaz
- Department of Cardiology and Angiology, University Hospital Tübingen, Eberhard Karls University Tübingen, 72076 Tübingen, Germany;
| | - Florian Lang
- Department of Vegetative and Clinical Physiology, Eberhard Karls University, 72074 Tübingen, Germany
- Correspondence: ; Tel.: +49-707-129-72194
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11
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Fan C, Yang X, Wang WW, Wang J, Li W, Guo M, Huang S, Wang Z, Liu K. Role of Kv1.3 Channels in Platelet Functions and Thrombus Formation. Arterioscler Thromb Vasc Biol 2020; 40:2360-2375. [PMID: 32787516 DOI: 10.1161/atvbaha.120.314278] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective:
Platelet activation by stimulatory factors leads to an increase in intracellular calcium concentration ([Ca
2+
]
i
), which is essential for almost all platelet functions. Modulation of Ca
2+
influx and [Ca
2+
]
i
in platelets has been emerging as a possible strategy for preventing and treating platelet-dependent thrombosis. Voltage-gated potassium 1.3 channels (Kv1.3) are highly expressed in platelets and able to regulate agonist-evoked [Ca
2+
]
i
increase. However, the role of Kv1.3 channels in regulating platelet functions and thrombosis has not yet been elucidated. In addition, it is difficult to obtain a specific blocker for this channel, since Kv1.3 shares identical drug-binding sites with other K
+
channels. Here, we investigate whether specific blockade of Kv1.3 channels by monoclonal antibodies affects platelet functions and thrombosis.
Approach and Results:
In this study, we produced the anti-Kv1.3 monoclonal antibody 6E12#15, which could specifically recognize both human and mouse Kv1.3 proteins and sufficiently block Kv1.3 channel currents. We found Kv1.3 blockade by 6E12#15 inhibited platelet aggregation, adhesion, and activation upon agonist stimulation. In vivo treatment with 6E12#15 alleviated thrombus formation in a mesenteric arteriole thrombosis mouse model and protected mice from collagen/epinephrine-induced pulmonary thromboembolism. Furthermore, we observed Kv1.3 regulated platelet functions by modulating Ca
2+
influx and [Ca
2+
]
i
elevation, and that this is mediated in part by P2X
1
. Interestingly,
Kv1.3
−/−
mice showed impaired platelet aggregation while displayed no abnormalities in in vivo thrombus formation. This phenomenon was related to more megakaryocytes and platelets produced in
Kv1.3
−/−
mice compared with wild-type mice.
Conclusions:
We showed specific inhibition of Kv1.3 by the novel monoclonal antibody 6E12#15 suppressed platelet functions and platelet-dependent thrombosis through modulating platelet [Ca
2+
]
i
elevation. These results indicate that Kv1.3 could act as a promising therapeutic target for antiplatelet therapies.
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Affiliation(s)
- Cheng Fan
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (C.F., M.G., S.H., Z.W.)
| | - Xiaofang Yang
- Center for Cardiac Intensive Care, Beijing Anzhen Hospital, Capital Medical University, China (X.Y.)
| | | | - Jue Wang
- Department of Hematology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (J.W.)
| | - Wenzhu Li
- Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston (W.L.)
| | - Mengyuan Guo
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (C.F., M.G., S.H., Z.W.)
| | - Shiyuan Huang
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (C.F., M.G., S.H., Z.W.)
| | - Zhaohui Wang
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (C.F., M.G., S.H., Z.W.)
| | - Kun Liu
- Institute of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (K.L.)
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12
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Komatsuya K, Kaneko K, Kasahara K. Function of Platelet Glycosphingolipid Microdomains/Lipid Rafts. Int J Mol Sci 2020; 21:ijms21155539. [PMID: 32748854 PMCID: PMC7432685 DOI: 10.3390/ijms21155539] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 01/09/2023] Open
Abstract
Lipid rafts are dynamic assemblies of glycosphingolipids, sphingomyelin, cholesterol, and specific proteins which are stabilized into platforms involved in the regulation of vital cellular processes. The rafts at the cell surface play important functions in signal transduction. Recent reports have demonstrated that lipid rafts are spatially and compositionally heterogeneous in the single-cell membrane. In this review, we summarize our recent data on living platelets using two specific probes of raft components: lysenin as a probe of sphingomyelin-rich rafts and BCθ as a probe of cholesterol-rich rafts. Sphingomyelin-rich rafts that are spatially and functionally distinct from the cholesterol-rich rafts were found at spreading platelets. Fibrin is translocated to sphingomyelin-rich rafts and platelet sphingomyelin-rich rafts act as platforms where extracellular fibrin and intracellular actomyosin join to promote clot retraction. On the other hand, the collagen receptor glycoprotein VI is known to be translocated to cholesterol-rich rafts during platelet adhesion to collagen. Furthermore, the functional roles of platelet glycosphingolipids and platelet raft-binding proteins including G protein-coupled receptors, stomatin, prohibitin, flotillin, and HflK/C-domain protein family, tetraspanin family, and calcium channels are discussed.
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13
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Pelzl L, Sahu I, Ma K, Heinzmann D, Bhuyan AAM, Al-Maghout T, Sukkar B, Sharma Y, Marini I, Rigoni F, Artunc F, Cao H, Gutti R, Voelkl J, Pieske B, Gawaz M, Bakchoul T, Lang F. Beta-Glycerophosphate-Induced ORAI1 Expression and Store Operated Ca 2+ Entry in Megakaryocytes. Sci Rep 2020; 10:1728. [PMID: 32015442 PMCID: PMC6997179 DOI: 10.1038/s41598-020-58384-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 01/03/2020] [Indexed: 12/13/2022] Open
Abstract
Impairment of renal phosphate elimination in chronic kidney disease (CKD) leads to enhanced plasma and tissue phosphate concentration, which in turn up-regulates transcription factor NFAT5 and serum & glucocorticoid-inducible kinase SGK1. The kinase upregulates ORAI1, a Ca2+-channel accomplishing store-operated Ca2+-entry (SOCE). ORAI1 is stimulated following intracellular store depletion by Ca2+-sensors STIM1 and/or STIM2. In megakaryocytes and blood platelets SOCE and thus ORAI1 are powerful regulators of activity. The present study explored whether the phosphate-donor ß-glycerophosphate augments NFAT5, ORAI1,2,3 and/or STIM1,2 expressions and thus SOCE in megakaryocytes. Human megakaryocytic Meg01cells were exposed to 2 mM of phosphate-donor ß-glycerophosphate for 24 hours. Platelets were isolated from blood samples of patients with impaired kidney function or control volunteers. Transcript levels were estimated utilizing q-RT-PCR, cytosolic Ca2+-concentration ([Ca2+]i) by Fura-2-fluorescence, and SOCE from increase of [Ca2+]i following re-addition of extracellular Ca2+ after store depletion with thapsigargin (1 µM). NFAT5 and ORAI1 protein abundance was estimated with Western blots. As a result, ß-glycerophosphate increased NFAT5, ORAI1/2/3, STIM1/2 transcript levels, as well as SOCE. Transcript levels of NFAT5, SGK1, ORAI1/2/3, and STIM1/2 as well as NFAT5 and ORAI1 protein abundance were significantly higher in platelets isolated from patients with impaired kidney function than in platelets from control volunteers. In conclusion, phosphate-donor ß-glycerophosphate triggers a signaling cascade of NFAT5/SGK1/ORAI/STIM, thus up-regulating store-operated Ca2+-entry.
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Affiliation(s)
- Lisann Pelzl
- Transfusion Medicine, Medical Faculty, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Itishri Sahu
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany.,Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, 500046, India
| | - Ke Ma
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - David Heinzmann
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | | | - Tamer Al-Maghout
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Basma Sukkar
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Yamini Sharma
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Irene Marini
- Transfusion Medicine, Medical Faculty, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Flaviana Rigoni
- Transfusion Medicine, Medical Faculty, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Ferruh Artunc
- Department of Internal Medicine IV, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Hang Cao
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Ravi Gutti
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad, 500046, India
| | - Jakob Voelkl
- Institute for Physiology, Johannes Kepler University, Linz, Austria.,DZHK (German Centre for Cardiovascular Research), partner site Berlin, Berlin, Germany.,Department of Nephrology and Medical Intensive Care, Charité University Medicine, Berlin, Germany.,Department of Internal Medicine and Cardiology, Campus Virchow Klinikum, Charité University Medicine, Berlin, Germany
| | - Burkert Pieske
- DZHK (German Centre for Cardiovascular Research), partner site Berlin, Berlin, Germany.,Berlin Institute of Health (BIH), Berlin, and Department of Internal Medicine and Cardiology, German Heart Center Berlin (DHZB), Berlin, Germany.,Department of Internal Medicine and Cardiology, Campus Virchow Klinikum, Charité University Medicine, Berlin, Germany
| | - Meinrad Gawaz
- Department of Internal Medicine III, Eberhard Karl University Tuebingen, Tuebingen, Germany
| | - Tamam Bakchoul
- Transfusion Medicine, Medical Faculty, Eberhard Karl University Tuebingen, Tuebingen, Germany.,Centre for Clinical Transfusion Medicine, University Hospital of Tuebingen, Tuebingen, Germany
| | - Florian Lang
- Department of Vegetative and Clinical Physiology, Eberhard Karl University Tuebingen, Tuebingen, Germany.
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14
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Huang L, Ma R, Lin T, Chaudhari S, Shotorbani PY, Yang L, Wu P. Glucagon-like peptide-1 receptor pathway inhibits extracellular matrix production by mesangial cells through store-operated Ca 2+ channel. Exp Biol Med (Maywood) 2019; 244:1193-1201. [PMID: 31510798 DOI: 10.1177/1535370219876531] [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: 12/21/2022] Open
Abstract
Glomerular mesangial cell is the major source of mesangial matrix. Our previous study demonstrated that store-operated Ca2+ channel signaling suppressed extracellular matrix protein production by mesangial cells. Recent studies demonstrated that glucagon-like peptide-1 receptor (GLP-1R) pathway had renoprotective effects. However, the underlying mechanism(s) remains unclear. The present study was aimed to determine if activation of GLP-1R decreased extracellular matrix protein production by mesangial cells through upregulation of store-operated Ca2+ function. Experiments were conducted in cultured human mesangial cells. Liraglutide and exendin 9–39 were used to activate and inhibit GLP-1R, respectively. Store-operated Ca2+ function was estimated by evaluating the SOC-mediated Ca2+ entry (SOCE). We found that liraglutide treatment reduced high glucose-stimulated production of fibronectin and collagen IV. The inhibitory effects of liraglutide were not observed in the presence of exendin 9–39. Exendin-4, another GLP-1R agonist also blunted high glucose-stimulated fibronectin and collagen IV production. Treatment of human mesangial cells with liraglutide for 24 h significantly attenuated the high glucose-induced reduction of Orai1 protein. Consistently, Ca2+ imaging experiments showed that the inhibition of high glucose on SOCE was significantly attenuated by liraglutide. However, in the presence of exendin 9–39, liraglutide failed to reverse the high glucose effect. Furthermore, liraglutide effects on fibronectin and collagen IV protein abundance were significantly attenuated by GSK-7975A, a selective blocker of store-operated Ca2+. Taken together, our findings suggest that GLP-1R signaling inhibited high glucose-induced extracellular matrix protein production in mesangial cells by restoring store-operated Ca2+ function. Impact statement Diabetic kidney disease continues to be a major challenge to health care system in the world. There are no known therapies currently available that can cure the disease. The present study provided compelling evidence that activation of GLP-1R inhibited extracellular matrix protein production by glomerular mesangial cells. We further showed that the beneficial effect of GLP-1R was attributed to upregulation of store-operated Ca2+ channel function. Therefore, we identified a novel mechanism contributing to the renal protective effects of GLP-1R pathway. Activation of GLP-1R pathway and/or store-operated Ca2+ channel signaling in MCs could be an option for patients with diabetic kidney disease.
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Affiliation(s)
- Linjing Huang
- Department of Endocrinology, The First Affiliated Hospital of Fujian Medical University, Diabetes Research Institute of Fujian Province, Fuzhou 350005, China.,Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, TX 76107, USA
| | - Rong Ma
- Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, TX 76107, USA
| | - Tingting Lin
- Department of Endocrinology, The First Affiliated Hospital of Fujian Medical University, Diabetes Research Institute of Fujian Province, Fuzhou 350005, China
| | - Sarika Chaudhari
- Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, TX 76107, USA
| | - Parisa Y Shotorbani
- Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, TX 76107, USA
| | - Liyong Yang
- Department of Endocrinology, The First Affiliated Hospital of Fujian Medical University, Diabetes Research Institute of Fujian Province, Fuzhou 350005, China
| | - Peiwen Wu
- Department of Endocrinology, The First Affiliated Hospital of Fujian Medical University, Diabetes Research Institute of Fujian Province, Fuzhou 350005, China
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15
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Garcinol A Novel Inhibitor of Platelet Activation and Apoptosis. Toxins (Basel) 2019; 11:toxins11070382. [PMID: 31266175 PMCID: PMC6669759 DOI: 10.3390/toxins11070382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 06/18/2019] [Accepted: 06/21/2019] [Indexed: 12/21/2022] Open
Abstract
Garcinol, an anti-inflammatory and anti-carcinogenic polyisoprenylated benzophenone isolated from Garcinia plants, stimulates tumor cell apoptosis and suicidal erythrocyte death, but supports the survival of hepatocytes and neurons. The present study explored whether the substance influences platelet function and/or apoptosis. To this end, we exposed murine blood platelets to garcinol (33 µM, 30 min) without and with activation by collagen-related peptide (CRP) (2-5 µg/mL) or thrombin (0.01 U/mL); flow cytometry was employed to estimate cytosolic Ca2+-activity ([Ca2+]i) from Fluo-3 fluorescence, platelet degranulation from P-selectin abundance, integrin activation from αIIbβ3 integrin abundance, caspase activity utilizing an Active Caspase-3 Staining kit, phosphatidylserine abundance from annexin-V-binding, relative platelet volume from forward scatter, and aggregation utilizing staining with CD9-APC and CD9-PE. As a result, in the absence of CRP and thrombin, the exposure of the platelets to garcinol did not significantly modify [Ca2+]i, P-selectin abundance, activated αIIbβ3 integrin, annexin-V-binding, cell volume, caspase activity, and aggregation. Exposure of platelets to CRP or thrombin was followed by a significant increase of [Ca2+]i, P-selectin abundance, αIIbβ3 integrin activity, annexin-V-binding, caspase activity, and aggregation, as well as significant cell shrinkage. All effects of CRP were strong and significant; those of thrombin were only partially and slightly blunted in the presence of garcinol. In conclusion, garcinol blunts CRP-induced platelet activity, apoptosis and aggregation.
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16
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Kim K, Do HJ, Oh TW, Kim KY, Kim TH, Ma JY, Park KI. Antiplatelet and Antithrombotic Activity of a Traditional Medicine, Hwangryunhaedok-Tang. Front Pharmacol 2019; 9:1502. [PMID: 30687085 PMCID: PMC6333754 DOI: 10.3389/fphar.2018.01502] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 12/10/2018] [Indexed: 12/12/2022] Open
Abstract
Platelet activation and accumulation at the site of vascular injury are central to thrombus formation resulted in thrombotic disorders. Medicinal herbs could be one of the most important pharmaceutical agents that ameliorate thrombotic disorders, such as unstable angina, myocardial infarction, stroke, and peripheral vascular diseases. Hwangryunhaedok-tang (HRT) is a traditional herbal medicine that displays multiple biological properties including anti-inflammatory abilities. However, its role in platelet activation has not been fully studied. Hence, we examined whether HRT has a potent inhibitory effect on platelet aggregation and thrombus formation. We demonstrated that HRT (30, 50, and 100 μg/ml) significantly impaired thrombin- and collagen-related peptide-induced platelet aggregation, granule secretion, thromboxane B2 generation, and intracellular Ca2+ mobilization. Biochemical studies revealed that HRT is involved in inhibiting the phosphorylation of phospholipase C and protein kinase B. The oral administration of HRT (30, 50, and 100 mg/kg once daily for 1 and/or 7 days) efficiently ameliorates ferric chloride induced arterial thrombus formation in vivo. Tail bleeding time was not significantly increased. The qualitative phytochemical constituents of the HRT extract were investigated using high-performance liquid chromatography. Our results demonstrated that HRT shows potential antiplatelet and antithrombotic effects without affecting hemostasis. Hence, HRT could be an effective therapeutic agent for the treatment of thrombotic diseases.
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Affiliation(s)
- Kyungho Kim
- Korean Medicine-Application Center, Korea Institute of Oriental Medicine, Daegu, South Korea
| | - Hyun Ju Do
- Korean Medicine-Application Center, Korea Institute of Oriental Medicine, Daegu, South Korea
| | - Tae Woo Oh
- Korean Medicine-Application Center, Korea Institute of Oriental Medicine, Daegu, South Korea
| | - Kwang-Youn Kim
- Korean Medicine-Application Center, Korea Institute of Oriental Medicine, Daegu, South Korea
| | - Tae Hoon Kim
- Department of Food Science and Biotechnology, Daegu University, Gyeongsan, South Korea
| | - Jin Yel Ma
- Korean Medicine-Application Center, Korea Institute of Oriental Medicine, Daegu, South Korea
| | - Kwang-Il Park
- Korean Medicine-Application Center, Korea Institute of Oriental Medicine, Daegu, South Korea
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17
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Kwon HW. Inhibitory Effect of 20(S)-Ginsenoside Rg3 on Human Platelet Aggregation and Intracellular Ca 2+ Levels via Cyclic Adenosine Monophosphate Dependent Manner. Prev Nutr Food Sci 2018; 23:317-325. [PMID: 30675461 PMCID: PMC6342537 DOI: 10.3746/pnf.2018.23.4.317] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 09/09/2018] [Indexed: 11/20/2022] Open
Abstract
Intracellular Ca2+ ([Ca2+]i) induces platelet aggregation, and influences the activation of aggregation associated-molecules. The increased [Ca2+]i activates both the Ca2+/calmodulin-dependent phosphorylation of the myosin light chain and the diacylglycerol-dependent phosphorylation of pleckstrin to trigger granule secretion (i.e., dense body and α-granule) and platelet aggregation. This study was carried out to elucidate the antagonistic effect of 20(S)-ginsenoside Rg3 (G-Rg3) present in Panax ginseng Mayer on Ca2+. G-Rg3 inhibited thrombin-induced human platelet aggregation in a dose-dependent manner and suppressed thrombin-induced elevation of [Ca2+]i mobilization. G-Rg3 increased the levels of cAMP, and subsequently, elevated the phosphorylation of inositol 1,4,5-triphosphate receptor I (Ser1756) during thrombin-induced human platelet aggregation. Moreover, G-Rg3 inhibited thapsigargin-induced Ca2+ influx and the thrombin-induced elevation of extracellular signal-regulated kinase 2 phosphorylation. G-Rg3 exhibited an inhibitory effect on [Ca2+]i levels leading to granule release and thus a therapeutic potential against platelet-mediated thrombotic disease is suggested.
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Affiliation(s)
- Hyuk-Woo Kwon
- Department of Biomedical Laboratory Science, Far East University, Chungbuk 27601, Korea
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18
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Hutchings CJ, Colussi P, Clark TG. Ion channels as therapeutic antibody targets. MAbs 2018; 11:265-296. [PMID: 30526315 PMCID: PMC6380435 DOI: 10.1080/19420862.2018.1548232] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 11/01/2018] [Accepted: 11/03/2018] [Indexed: 12/12/2022] Open
Abstract
It is now well established that antibodies have numerous potential benefits when developed as therapeutics. Here, we evaluate the technical challenges of raising antibodies to membrane-spanning proteins together with enabling technologies that may facilitate the discovery of antibody therapeutics to ion channels. Additionally, we discuss the potential targeting opportunities in the anti-ion channel antibody landscape, along with a number of case studies where functional antibodies that target ion channels have been reported. Antibodies currently in development and progressing towards the clinic are highlighted.
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Affiliation(s)
| | | | - Theodore G. Clark
- TetraGenetics Inc, Arlington Massachusetts, USA
- Department of Microbiology and Immunology, Cornell University, Ithaca New York, USA
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19
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Cao H, Qadri SM, Lang E, Pelzl L, Umbach AT, Leiss V, Birnbaumer L, Nürnberg B, Pieske B, Voelkl J, Gawaz M, Bissinger R, Lang F. Heterotrimeric G-protein subunit Gα i2 contributes to agonist-sensitive apoptosis and degranulation in murine platelets. Physiol Rep 2018; 6:e13841. [PMID: 30187671 PMCID: PMC6125243 DOI: 10.14814/phy2.13841] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Accepted: 07/27/2018] [Indexed: 01/06/2023] Open
Abstract
Gαi2 , a heterotrimeric G-protein subunit, regulates various cell functions including ion channel activity, cell differentiation, proliferation and apoptosis. Platelet-expressed Gαi2 is decisive for the extent of tissue injury following ischemia/reperfusion. However, it is not known whether Gαi2 plays a role in the regulation of platelet apoptosis, which is characterized by caspase activation, cell shrinkage and cell membrane scrambling with phosphatidylserine (PS) translocation to the platelet surface. Stimulators of platelet apoptosis include thrombin and collagen-related peptide (CoRP), which are further known to enhance degranulation and activation of αIIb β3-integrin and caspases. Using FACS analysis, we examined the impact of agonist treatment on activation and apoptosis in platelets drawn from mice lacking Gαi2 and their wild-type (WT) littermates. As a result, treatment with either thrombin (0.01 U/mL) or CoRP (2 μg/mL or 5 μg/mL) significantly upregulated PS-exposure and significantly decreased forward scatter, reflecting cell size, in both genotypes. Exposure to CoRP triggered a significant increase in active caspase 3, ceramide formation, surface P-selectin, and αIIb β3-integrin activation. These molecular alterations were significantly less pronounced in Gαi2 -deficient platelets as compared to WT platelets. In conclusion, our data highlight a previously unreported role of Gαi2 signaling in governing platelet activation and apoptosis.
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Affiliation(s)
- Hang Cao
- Department of Vegetative & Clinical PhysiologyEberhard‐Karls UniversityTübingenGermany
| | - Syed M. Qadri
- Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonOntarioCanada
- Centre for InnovationCanadian Blood ServicesHamiltonOntarioCanada
| | - Elisabeth Lang
- Department of Molecular Medicine IIHeinrich Heine UniversityDüsseldorfGermany
| | - Lisann Pelzl
- Department of Vegetative & Clinical PhysiologyEberhard‐Karls UniversityTübingenGermany
| | - Anja T. Umbach
- Department of Vegetative & Clinical PhysiologyEberhard‐Karls UniversityTübingenGermany
| | - Veronika Leiss
- Department of Pharmacology and Experimental TherapyInterfaculty Center of Pharmacology and Drug Research (ICePhA)Eberhard‐Karls UniversityTübingenGermany
| | - Lutz Birnbaumer
- Neurobiology LaboratoryNational Institute of Environmental Health SciencesNational Institutes of HealthDurhamNorth Carolina
- Institute of Biomedical Research (BIOMED)Catholic University of ArgentinaBuenos AiresArgentina
| | - Bernd Nürnberg
- Department of Pharmacology and Experimental TherapyInterfaculty Center of Pharmacology and Drug Research (ICePhA)Eberhard‐Karls UniversityTübingenGermany
| | - Burkert Pieske
- Department of Internal Medicine and CardiologyCharité‐Universitätsmedizin Berlin, and German Heart InstituteBerlinGermany
- Berlin Institute of Health (BIH)BerlinGermany
- DZHK (German Centre for Cardiovascular Research), partner siteBerlinGermany
| | - Jakob Voelkl
- Department of Internal Medicine and CardiologyCharité‐Universitätsmedizin Berlin, and German Heart InstituteBerlinGermany
- Berlin Institute of Health (BIH)BerlinGermany
- DZHK (German Centre for Cardiovascular Research), partner siteBerlinGermany
| | - Meinrad Gawaz
- Department of Internal Medicine IIIEberhard‐Karls UniversityTübingenGermany
| | - Rosi Bissinger
- Department of Internal Medicine IIIEberhard‐Karls UniversityTübingenGermany
| | - Florian Lang
- Department of Vegetative & Clinical PhysiologyEberhard‐Karls UniversityTübingenGermany
- Department of Molecular Medicine IIHeinrich Heine UniversityDüsseldorfGermany
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20
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Glosse P, Feger M, Mutig K, Chen H, Hirche F, Hasan AA, Gaballa MMS, Hocher B, Lang F, Föller M. AMP-activated kinase is a regulator of fibroblast growth factor 23 production. Kidney Int 2018; 94:491-501. [PMID: 29861059 DOI: 10.1016/j.kint.2018.03.006] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 03/01/2018] [Accepted: 03/08/2018] [Indexed: 12/20/2022]
Abstract
Fibroblast growth factor 23 (FGF23) is a proteohormone regulating renal phosphate transport and vitamin D metabolism as well as inducing left heart hypertrophy. FGF23-deficient mice suffer from severe tissue calcification, accelerated aging and a myriad of aging-associated diseases. Bone cells produce FGF23 upon store-operated calcium ion entry (SOCE) through the calcium selective ion channel Orai1. AMP-activated kinase (AMPK) is a powerful energy sensor helping cells survive states of energy deficiency, and AMPK down-regulates Orai1. Here we investigated the role of AMPK in FGF23 production. Fgf23 gene transcription was analyzed by qRT-PCR and SOCE by fluorescence optics in UMR106 osteoblast-like cells while the serum FGF23 concentration and phosphate metabolism were assessed in AMPKα1-knockout and wild-type mice. The AMPK activator, 5-aminoimidazole-4-carboxamide ribonucleotide (AICAR) down-regulated, whereas the AMPK inhibitor, dorsomorphin dihydrochloride (compound C) and AMPK gene silencing induced Fgf23 transcription. AICAR decreased membrane abundance of Orai1 and SOCE. SOCE inhibitors lowered Fgf23 gene expression induced by AMPK inhibition. AMPKα1-knockout mice had a higher serum FGF23 concentration compared to wild-type mice. Thus, AMPK participates in the regulation of FGF23 production in vitro and in vivo. The inhibitory effect of AMPK on FGF23 production is at least in part mediated by Orai1-involving SOCE.
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Affiliation(s)
- Philipp Glosse
- Department of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Martina Feger
- Department of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Kerim Mutig
- Department of Anatomy, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Hong Chen
- Department of Physiology I, Eberhard-Karls University of Tübingen, Tübingen, Germany
| | - Frank Hirche
- Department of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | | | | | - Berthold Hocher
- Department of Nutritional Sciences, University of Potsdam, Potsdam, Germany
| | - Florian Lang
- Department of Physiology I, Eberhard-Karls University of Tübingen, Tübingen, Germany
| | - Michael Föller
- Department of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany.
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21
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Wu X, Luo P, Rao W, Dai S, Zhang L, Ma W, Pu J, Yu Y, Wang J, Fei Z. Homer1a Attenuates Hydrogen Peroxide-Induced Oxidative Damage in HT-22 Cells through AMPK-Dependent Autophagy. Front Neurosci 2018; 12:51. [PMID: 29479301 PMCID: PMC5811507 DOI: 10.3389/fnins.2018.00051] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 01/22/2018] [Indexed: 12/25/2022] Open
Abstract
Neuronal oxidative stress is involved in diverse neurological disorders. Homer1a, as an important member of the Homer family and localized at the postsynaptic density, is known to protect cells against oxidative injury. However, the exact neuroprotective mechanism of Homer1a has not been fully elucidated. Here, we found that Homer1a promoted cell viability and reduced H2O2-induced LDH release. The overexpression of Homer1a enhanced autophagy after H2O2 treatment, which was confirmed by increased expression of LC3II, Beclin-1, and greater autophagosome formation. In addition, we demonstrated that activating autophagy improved cell survival and reduced H2O2-induced oxidative stress and mitochondrial damage. Moreover, the autophagy inhibitor 3-MA partially prevented the protective effects of Homer1a against oxidative challenge. We also found that the upregulation of Homer1a after H2O2 treatment increased the phosphorylation of AMPK. Furthermore, the AMPK inhibitor compound C inhibited Homer1a-induced autophagy and abolished Homer1a-mediated neuroprotection. All the above data suggests that Homer1a confers protection against H2O2-induced oxidative damage via AMPK-dependent autophagy.
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Affiliation(s)
- Xiuquan Wu
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Peng Luo
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Wei Rao
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China.,Department of Neurosurgery, PLA Navy General Hospital, Beijing, China
| | - Shuhui Dai
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Lei Zhang
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Wenke Ma
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China.,Department of Neurosurgery, Baoji Center Hospital of Shanxi Province, Baoji, China
| | - Jingnan Pu
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Yang Yu
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Jiu Wang
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Zhou Fei
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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22
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Malchow S, Loosse C, Sickmann A, Lorenz C. Quantification of Cardiovascular Disease Biomarkers in Human Platelets by Targeted Mass Spectrometry. Proteomes 2017; 5:proteomes5040031. [PMID: 29140295 PMCID: PMC5748566 DOI: 10.3390/proteomes5040031] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 11/07/2017] [Accepted: 11/13/2017] [Indexed: 01/01/2023] Open
Abstract
Platelets are known to be key players in thrombosis and hemostasis, contributing to the genesis and progression of cardiovascular diseases. Due to their pivotal role in human physiology and pathology, platelet function is regulated tightly by numerous factors which have either stimulatory or inhibitory effects. A variety of factors, e.g., collagen, fibrinogen, ADP, vWF, thrombin, and thromboxane promote platelet adhesion and aggregation by utilizing multiple intracellular signal cascades. To quantify platelet proteins for this work, a targeted proteomics workflow was applied. In detail, platelets are isolated and lyzed, followed by a tryptic protein digest. Subsequently, a mix of stable isotope-labeled peptides of interesting biomarker proteins in concentrations ranging from 0.1 to 100 fmol is added to 3 μg digest. These peptides are used as an internal calibration curve to accurately quantify endogenous peptides and corresponding proteins in a pooled platelet reference sample by nanoLC-MS/MS with parallel reaction monitoring. In order to assure a valid quantification, limit of detection (LOD) and limit of quantification (LOQ), as well as linear range, were determined. This quantification of platelet activation and proteins by targeted mass spectrometry may enable novel diagnostic strategies in the detection and prevention of cardiovascular diseases.
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Affiliation(s)
- Sebastian Malchow
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany.
| | - Christina Loosse
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany.
| | - Albert Sickmann
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany.
| | - Christin Lorenz
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., 44139 Dortmund, Germany.
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23
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Sahu I, Pelzl L, Sukkar B, Fakhri H, al‐Maghout T, Cao H, Hauser S, Gutti R, Gawaz M, Lang F. NFAT5‐sensitive Orai1 expression and store‐operated Ca
2+
entry in megakaryocytes. FASEB J 2017; 31:3439-3448. [DOI: 10.1096/fj.201601211r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Affiliation(s)
- Itishri Sahu
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
- Department of BiochemistrySchool of Life SciencesUniversity of Hyderabad Hyderabad India
| | - Lisann Pelzl
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
| | - Basma Sukkar
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
| | - Hajar Fakhri
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
| | - Tamer al‐Maghout
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
| | - Hang Cao
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
| | - Stefan Hauser
- German Center for Neurodegenerative Diseases Tübingen Germany
| | - Ravi Gutti
- Department of BiochemistrySchool of Life SciencesUniversity of Hyderabad Hyderabad India
| | - Meinrad Gawaz
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
| | - Florian Lang
- Department of Cardiology and Vascular Medicine and PhysiologyUniversity of Tübingen Tübingena Germany
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24
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Pellerin D, Lortie A, Corbin F. Platelets as a surrogate disease model of neurodevelopmental disorders: Insights from Fragile X Syndrome. Platelets 2017; 29:113-124. [PMID: 28660769 DOI: 10.1080/09537104.2017.1317733] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Fragile X Syndrome (FXS) is the most common inherited form of intellectual disability and the leading monogenic cause of autism spectrum disorders (ASD). Despite a large number of therapeutics developed in past years, there is currently no targeted treatment approved for FXS. In fact, translation of the positive and very promising preclinical findings from animal models to human subjects has so far fallen short owing in part to the low predictive validity of the Fmr1 ko mouse, an overly simplistic model of the complex human disease. This issue stresses the critical need to identify new surrogate human peripheral cell models of FXS, which may in fact allow for the identification of novel and more efficient therapies. Of all described models, blood platelets appear to be one of the most promising and appropriate disease models of FXS, in part owing to their close biochemical similarities with neurons. Noteworthy, they also recapitulate some of FXS neuron's core molecular dysregulations, such as hyperactivity of the MAPK/ERK and PI3K/Akt/mTOR pathways, elevated enzymatic activity of MMP9 and decreased production of cAMP. Platelets might therefore help furthering our understanding of FXS pathophysiology and might also lead to the identification of disease-specific biomarkers, as was shown in several psychiatric disorders such as schizophrenia and Alzheimer's disease. Moreover, there is additional evidence suggesting that platelet signaling may assist with prediction of cognitive phenotype and could represent a potent readout of drug efficacy in clinical trials. Globally, given the neurobiological overlap between different forms of intellectual disability, platelets may be a valuable window to access the molecular underpinnings of ASD and other neurodevelopmental disorders (NDD) sharing similar synaptic plasticity defects with FXS. Platelets are indeed an attractive model for unraveling pathophysiological mechanisms involved in NDD as well as to search for diagnostic and therapeutic biomarkers.
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Affiliation(s)
- David Pellerin
- a Department of Biochemistry, Faculty of Medicine and Health Sciences , Université de Sherbrooke , Sherbrooke , QC , Canada.,b Department of Neurology and Neurosurgery, Faculty of Medicine , McGill University , Montreal , QC , Canada
| | - Audrey Lortie
- a Department of Biochemistry, Faculty of Medicine and Health Sciences , Université de Sherbrooke , Sherbrooke , QC , Canada
| | - François Corbin
- a Department of Biochemistry, Faculty of Medicine and Health Sciences , Université de Sherbrooke , Sherbrooke , QC , Canada
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25
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Dong M, Zheng N, Ren LJ, Zhou H, Liu J. Increased expression of STIM1/Orai1 in platelets of stroke patients predictive of poor outcomes. Eur J Neurol 2017; 24:912-919. [PMID: 28544117 DOI: 10.1111/ene.13304] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 03/23/2017] [Indexed: 12/30/2022]
Abstract
BACKGROUND AND PURPOSE The platelet activation that is mediated by store-operated Ca2+ entry via stromal interaction molecule (STIM1) and Orai1 Ca2+ influx channels has been shown to play a key role in ischaemic stroke (IS). This study aimed to evaluate the impact of platelet STIM1/Orai1 protein expression on outcomes of IS. METHODS A total of 160 patients with acute non-cardioembolic IS, among whom 45 patients had small-vessel diseases and 115 patients had large-vessel diseases, were evaluated. Patients were divided into two groups according to their baseline platelet STIM1/Orai1 protein expression: high-expression group (HG) (n = 80) and low-expression group (LG) (n = 80). Univariate and multivariate regression models were used to assess the correlation between STIM1/Orai1 expression and clinical outcomes, which included stroke severity that was measured based on the National Institutes of Health Stroke Scale and Stroke Impact Scale (SIS) at baseline and during the 3-month follow-up. RESULTS There were no significant differences in age, sex and cardiovascular risk factors between patients in HG and LG. However, HG had very high levels of biomarkers such as glycosylated hemoglobin, C-reactive protein, homocysteine and high mobility group box-1 protein (all P < 0.05). Although the baseline stroke severity (National Institutes of Health Stroke Scale score) was not obviously higher in HG than in LG, patients showed a better recovery score (SIS score) in LG than in HG (90.75 ± 13.65 vs. 80.68 ± 7.09; P = 0.022). STIM1/Orai1 expression was an independent predictor of the 3-month stroke recovery (hazard ratio, 4.543; 95% confidence interval, 1.941-29.145; P = 0.029). CONCLUSIONS A high expression level of platelet Orai1/STIMI1 was associated with poor clinical outcome (mortality and recurrence) and functional recovery (SIS scores) during the 3-month follow-up. Thus, we propose that these proteins are strongly predictive of life quality in patients with IS.
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Affiliation(s)
- M Dong
- School of Medicine, Shenzhen University, Shenzhen, China
| | - N Zheng
- School of Medicine, Shenzhen University, Shenzhen, China
| | - L J Ren
- The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - H Zhou
- The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - J Liu
- School of Medicine, Shenzhen University, Shenzhen, China
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26
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Walker-Allgaier B, Schaub M, Alesutan I, Voelkl J, Geue S, Münzer P, Rodríguez JM, Kuhl D, Lang F, Gawaz M, Borst O. SGK1 up-regulates Orai1 expression and VSMC migration during neointima formation after arterial injury. Thromb Haemost 2017; 117:1002-1005. [PMID: 28203685 DOI: 10.1160/th16-09-0690] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 01/23/2017] [Indexed: 12/22/2022]
Abstract
Supplementary Material to this article is available online at www.thrombosis-online.com
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Meinrad Gawaz
- Meinrad Gawaz, MD, Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Otfried Mueller-Str. 10, 72076 Tübingen, Germany, Tel.: +49 7071 2983688, Fax: +49 7071 294473 , E-mail:
| | - Oliver Borst
- Oliver Borst, MD, Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Otfried Mueller-Str. 10, 72076 Tübingen, Germany, Tel.: +49 7071 2984483, Fax: +49 7071 294473, E-mail:
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27
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Tanwar J, Trebak M, Motiani RK. Cardiovascular and Hemostatic Disorders: Role of STIM and Orai Proteins in Vascular Disorders. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 993:425-452. [PMID: 28900927 DOI: 10.1007/978-3-319-57732-6_22] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Store-operated Ca2+ entry (SOCE) mediated by STIM and Orai proteins is a highly regulated and ubiquitous signaling pathway that plays an important role in various cellular and physiological functions. Endoplasmic reticulum (ER) serves as the major site for intracellular Ca2+ storage. Stromal Interaction Molecule 1/2 (STIM1/2) sense decrease in ER Ca2+ levels and transmits the message to plasma membrane Ca2+ channels constituted by Orai family members (Orai1/2/3) resulting in Ca2+ influx into the cells. This increase in cytosolic Ca2+ in turn activates a variety of signaling cascades to regulate a plethora of cellular functions. Evidence from the literature suggests that SOCE dysregulation is associated with several pathophysiologies, including vascular disorders. Interestingly, recent studies have suggested that STIM proteins may also regulate vascular functions independent of their contribution to SOCE. In this updated book chapter, we will focus on the physiological role of STIM and Orai proteins in the vasculature (endothelial cells and vascular smooth muscle cells). We will further retrospect the literature implicating a critical role for these proteins in vascular disease.
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Affiliation(s)
- Jyoti Tanwar
- Systems Biology Group, CSIR-Institute of Genomics and Integrative Biology, Mathura Road, New Delhi, 110020, India
| | - Mohamed Trebak
- Department of Cellular and Molecular Physiology, The Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA.
| | - Rajender K Motiani
- Systems Biology Group, CSIR-Institute of Genomics and Integrative Biology, Mathura Road, New Delhi, 110020, India.
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28
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Lopez JJ, Salido GM, Rosado JA. Cardiovascular and Hemostatic Disorders: SOCE and Ca 2+ Handling in Platelet Dysfunction. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 993:453-472. [PMID: 28900928 DOI: 10.1007/978-3-319-57732-6_23] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Among the Ca2+ entry mechanisms in platelets, store-operated Ca2+ entry (SOCE) plays a prominent role as it is necessary to achieve full activation of platelet functions and replenish intracellular Ca2+ stores. In platelets, as in other non-excitable cells, SOCE has been reported to involve the activation of plasma membrane channels by the ER Ca2+ sensor STIM1. Despite electrophysiological studies are not possible in human platelets, indirect analyses have revealed that the Ca2+-permeable channels involve Orai1 and, most likely, TRPC1 subunits. A relevant role for the latter has not been found in mouse platelets. There is a body of evidence revealing a number of abnormalities in SOCE or in its molecular regulators that result in qualitative platelet disorders and, as a consequence, altered platelet responsiveness upon stimulation with multiple physiological agonists. Platelet SOCE abnormalities include STIM1 and Orai1 mutations. This chapter summarizes the current knowledge in this field, as well as the disorders associated to platelet SOCE dysfunction.
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Affiliation(s)
- Jose J Lopez
- Cell Physiology Research Group, Department of Physiology, University of Extremadura, Cáceres, Spain
| | - Gines M Salido
- Cell Physiology Research Group, Department of Physiology, University of Extremadura, Cáceres, Spain
| | - Juan A Rosado
- Cell Physiology Research Group, Department of Physiology, University of Extremadura, Cáceres, Spain.
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29
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DREAM plays an important role in platelet activation and thrombogenesis. Blood 2016; 129:209-225. [PMID: 27903531 DOI: 10.1182/blood-2016-07-724419] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 11/23/2016] [Indexed: 01/18/2023] Open
Abstract
Downstream regulatory element antagonist modulator (DREAM), a transcriptional repressor, is known to modulate pain responses. However, it is unknown whether DREAM is expressed in anucleate platelets and plays a role in thrombogenesis. By using intravital microscopy with DREAM-null mice and their bone marrow chimeras, we demonstrated that both hematopoietic and nonhematopoietic cell DREAMs are required for platelet thrombus formation following laser-induced arteriolar injury. In a FeCl3-induced thrombosis model, we found that compared with wild-type (WT) control and nonhematopoietic DREAM knockout (KO) mice, DREAM KO control and hematopoietic DREAM KO mice showed a significant delay in time to occlusion. Tail bleeding time was prolonged in DREAM KO control mice, but not in WT or DREAM bone marrow chimeric mice. In vivo adoptive transfer experiments further indicated the importance of platelet DREAM in thrombogenesis. We found that DREAM deletion does not alter the ultrastructural features of platelets but significantly impairs platelet aggregation and adenosine triphosphate secretion induced by numerous agonists (collagen-related peptide, adenosine 5'-diphosphate, A23187, thrombin, or U46619). Biochemical studies revealed that platelet DREAM positively regulates phosphoinositide 3-kinase (PI3K) activity during platelet activation. Using DREAM-null platelets and PI3K isoform-specific inhibitors, we observed that platelet DREAM is important for α-granule secretion, Ca2+ mobilization, and aggregation through PI3K class Iβ (PI3K-Iβ). Genetic and pharmacological studies in human megakaryoblastic MEG-01 cells showed that DREAM is important for A23187-induced Ca2+ mobilization and its regulatory function requires Ca2+ binding and PI3K-Iβ activation. These results suggest that platelet DREAM regulates PI3K-Iβ activity and plays an important role during thrombus formation.
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30
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Sabourin J, Bartoli F, Antigny F, Gomez AM, Benitah JP. Transient Receptor Potential Canonical (TRPC)/Orai1-dependent Store-operated Ca2+ Channels: NEW TARGETS OF ALDOSTERONE IN CARDIOMYOCYTES. J Biol Chem 2016; 291:13394-409. [PMID: 27129253 DOI: 10.1074/jbc.m115.693911] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Indexed: 12/31/2022] Open
Abstract
Store-operated Ca(2+) entry (SOCE) has emerged as an important mechanism in cardiac pathology. However, the signals that up-regulate SOCE in the heart remain unexplored. Clinical trials have emphasized the beneficial role of mineralocorticoid receptor (MR) signaling blockade in heart failure and associated arrhythmias. Accumulated evidence suggests that the mineralocorticoid hormone aldosterone, through activation of its receptor, MR, might be a key regulator of Ca(2+) influx in cardiomyocytes. We thus assessed whether and how SOCE involving transient receptor potential canonical (TRPC) and Orai1 channels are regulated by aldosterone/MR in neonatal rat ventricular cardiomyocytes. Molecular screening using qRT-PCR and Western blotting demonstrated that aldosterone treatment for 24 h specifically increased the mRNA and/or protein levels of Orai1, TRPC1, -C4, -C5, and stromal interaction molecule 1 through MR activation. These effects were correlated with a specific enhancement of SOCE activities sensitive to store-operated channel inhibitors (SKF-96365 and BTP2) and to a potent Orai1 blocker (S66) and were prevented by TRPC1, -C4, and Orai1 dominant negative mutants or TRPC5 siRNA. A mechanistic approach showed that up-regulation of serum- and glucocorticoid-regulated kinase 1 mRNA expression by aldosterone is involved in enhanced SOCE. Functionally, 24-h aldosterone-enhanced SOCE is associated with increased diastolic [Ca(2+)]i, which is blunted by store-operated channel inhibitors. Our study provides the first evidence that aldosterone promotes TRPC1-, -C4-, -C5-, and Orai1-mediated SOCE in cardiomyocytes through an MR and serum- and glucocorticoid-regulated kinase 1 pathway.
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Affiliation(s)
- Jessica Sabourin
- From the UMR S1180, INSERM, Université Paris-Sud, Université Paris-Saclay, 92296 Châtenay-Malabry, France and
| | - Fiona Bartoli
- From the UMR S1180, INSERM, Université Paris-Sud, Université Paris-Saclay, 92296 Châtenay-Malabry, France and
| | - Fabrice Antigny
- UMR S999, INSERM, Université Paris-Sud, Université Paris-Saclay, Centre Chirurgical Marie Lannelongue, 92350 Le Plessis Robinson, France
| | - Ana Maria Gomez
- From the UMR S1180, INSERM, Université Paris-Sud, Université Paris-Saclay, 92296 Châtenay-Malabry, France and
| | - Jean-Pierre Benitah
- From the UMR S1180, INSERM, Université Paris-Sud, Université Paris-Saclay, 92296 Châtenay-Malabry, France and
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31
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Pellerin D, Çaku A, Fradet M, Bouvier P, Dubé J, Corbin F. Lovastatin corrects ERK pathway hyperactivation in fragile X syndrome: potential of platelet’s signaling cascades as new outcome measures in clinical trials. Biomarkers 2016; 21:497-508. [DOI: 10.3109/1354750x.2016.1160289] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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32
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Xie J, Pan H, Yao J, Zhou Y, Han W. SOCE and cancer: Recent progress and new perspectives. Int J Cancer 2015; 138:2067-77. [PMID: 26355642 PMCID: PMC4764496 DOI: 10.1002/ijc.29840] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2015] [Accepted: 09/03/2015] [Indexed: 12/15/2022]
Abstract
Ca2+ acts as a universal and versatile second messenger in the regulation of a myriad of biological processes, including cell proliferation, differentiation, migration and apoptosis. Store‐operated Ca2+ entry (SOCE) mediated by ORAI and the stromal interaction molecule (STIM) constitutes one of the major routes of calcium entry in nonexcitable cells, in which the depletion of intracellular Ca2+ stores triggers activation of the endoplasmic reticulum (ER)‐resident Ca2+ sensor protein STIM to gate and open the ORAI Ca2+ channels in the plasma membrane (PM). Accumulating evidence indicates that SOCE plays critical roles in cancer cell proliferation, metastasis and tumor neovascularization, as well as in antitumor immunity. We summarize herein the recent advances in our understanding of the function of SOCE in various types of tumor cells, vascular endothelial cells and cells of the immune system. Finally, the therapeutic potential of SOCE inhibitors in the treatment of cancer is also discussed.
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Affiliation(s)
- Jiansheng Xie
- Laboratory of Cancer Biology, Institute of Clinical Science, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Hongming Pan
- Laboratory of Cancer Biology, Institute of Clinical Science, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China.,Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Junlin Yao
- Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yubin Zhou
- Center for Translational Cancer Research, Institute of Biosciences and Technology, Texas A&M University Health Science Center, Houston, TX
| | - Weidong Han
- Laboratory of Cancer Biology, Institute of Clinical Science, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China.,Department of Medical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
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33
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Liu G, Liu G, Alzoubi K, Chatterjee M, Walker B, Münzer P, Luo D, Umbach AT, Elvira B, Chen H, Voelkl J, Föller M, Mak TW, Borst O, Gawaz M, Lang F. CD44 sensitivity of platelet activation, membrane scrambling and adhesion under high arterial shear rates. Thromb Haemost 2015; 115:99-108. [PMID: 26355696 DOI: 10.1160/th14-10-0847] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 07/26/2015] [Indexed: 12/29/2022]
Abstract
CD44 is required for signalling of macrophage migration inhibitory factor (MIF), an anti-apoptotic pro-inflammatory cytokine. MIF is expressed and released from blood platelets, key players in the orchestration of occlusive vascular disease. Nothing is known about a role of CD44 in the regulation of platelet function. The present study thus explored whether CD44 modifies degranulation (P-selectin exposure), integrin activation, caspase activity, phosphatidylserine exposure on the platelet surface, platelet volume, Orai1 protein abundance and cytosolic Ca(2+)-activity ([Ca2+]i). Platelets from mice lacking CD44 (cd44(-/-)) were compared to platelets from corresponding wild-type mice (cd44(+/+)). In resting platelets, P-selectin abundance, α(IIb)β3 integrin activation, caspase-3 activity and phosphatidylserine exposure were negligible in both genotypes and Orai1 protein abundance, [Ca2+]i, and volume were similar in cd44(-/-) and cd44(+/+) platelets. Platelet degranulation and α(IIb)β3 integrin activation were significantly increased by thrombin (0.02 U/ml), collagen related peptide (CRP, 2 µg/ml and Ca(2+)-store depletion with thapsigargin (1 µM), effects more pronounced in cd44(-/-) than in cd44(+/+) platelets. Thrombin (0.02 U/ml) increased platelet [Ca2+]i, caspase-3 activity, phosphatidylserine exposure and Orai1 surface abundance, effects again significantly stronger in cd44(-/-) than in cd44(+/+) platelets. Thrombin further decreased forward scatter in cd44(-/-) and cd44(+/+) platelets, an effect which tended to be again more pronounced in cd44(-/-) than in cd44(+/+) platelets. Platelet adhesion and in vitro thrombus formation under high arterial shear rates (1,700 s(-1)) were significantly augmented in cd44(-/-) mice. In conclusion, genetic deficiency of CD44 augments activation, apoptosis and pro-thrombotic potential of platelets.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Florian Lang
- Florian Lang, Department of Physiology, University of Tübingen, Gmelinstr. 5, 72076 Tübingen, Germany, Tel.: +49 7071 29-72194, Fax: +49 7071 29-5618, E-mail:
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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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35
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Karim ZA, Vemana HP, Khasawneh FT. MALT1-ubiquitination triggers non-genomic NF-κB/IKK signaling upon platelet activation. PLoS One 2015; 10:e0119363. [PMID: 25748427 PMCID: PMC4352082 DOI: 10.1371/journal.pone.0119363] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/13/2015] [Indexed: 11/19/2022] Open
Abstract
We have recently shown that IKK complex plays an important non-genomic role in platelet function, i.e., regulates SNARE machinery-dependent membrane fusion. In this connection, it is well known that MALT1, whose activity is modulated by proteasome, plays an important role in the regulation of IKK complex. Therefore, the present studies investigated the mechanism by which IKK signaling is regulated in the context of the platelet proteasome. It was found that platelets express a functional proteasome, and form CARMA/MALT1/Bcl10 (CBM) complex when activated. Using a pharmacological inhibitor, the proteasome was found to regulate platelet function (aggregation, integrin activation, secretion, phosphatidylserine exposure and changes in intracellular calcium). It was also found to regulate thrombogenesis and physiologic hemostasis. We also observed, upon platelet activation, that MALT1 is ubiquitinated, and this coincides with the activation of the IKK/NF-κB-signaling pathway. Finally, we observed that the proteasome inhibitor blocks CBM complex formation and the interaction of IKKγ and MALT1; abrogates SNARE formation, and the association of MALT1 with TAK1 and TAB2, which are upstream of the CBM complex. Thus, our data demonstrate that MALT1 ubiquitination is critical for the engagement of CBM and IKK complexes, thereby directing platelet signals to the NF-κB pathway.
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Affiliation(s)
- Zubair A. Karim
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, Pomona, CA, 91766, United States of America
- * E-mail:
| | - Hari Priya Vemana
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, Pomona, CA, 91766, United States of America
| | - Fadi T. Khasawneh
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, Pomona, CA, 91766, United States of America
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Lang F, Gawaz M, Borst O. The serum- & glucocorticoid-inducible kinase in the regulation of platelet function. Acta Physiol (Oxf) 2015; 213:181-90. [PMID: 24947805 DOI: 10.1111/apha.12334] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 06/02/2014] [Accepted: 06/15/2014] [Indexed: 12/23/2022]
Abstract
The serum- and glucocorticoid-inducible kinase 1 (SGK1) is expressed in megakaryocytes and circulating platelets. In megakaryocytes, SGK1 activates transcription factor nuclear factor kappa-B (NF-κB), which in turn stimulates expression of Orai1, a Ca(2+) channel protein accomplishing store-operated Ca(2+) enrty (SOCE). SGK1 enhances SOCE and several Ca(2+) -sensitive platelet functions, including degranulation, integrin αII b β3 activation, phosphatidylserine exposure, aggregation and thrombus formation. As shown in other cell types, stimulators of SGK1 expression include ischaemia, oxidative stress, hyperglycaemia, advanced glycation end products (AGEs) and a variety of hormones such as glucocorticoids, mineralocorticoids, transforming growth factor beta (TGFβ), interleukin 6 (IL-6), platelet-derived growth factor (PDGF), thrombin and endothelin. Thus, SGK1-sensitive Ca(2+) signalling may contribute to altered platelet function in several clinical conditions including inflammation, metabolic syndrome, diabetes mellitus and chronic renal failure. Nevertheless, further studies are needed defining the contribution of altered SGK1 expression and activity to physiology and pathophysiology of platelets.
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Affiliation(s)
- F. Lang
- Department of Physiology; University of Tübingen; Tübingen Germany
| | - M. Gawaz
- Department of Cardiology & Cardiovascular Medicine; University of Tübingen; Tübingen Germany
| | - O. Borst
- Department of Physiology; University of Tübingen; Tübingen Germany
- Department of Cardiology & Cardiovascular Medicine; University of Tübingen; Tübingen Germany
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37
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Diagnostic potential of differentially expressed Homer1, IL-1β, and TNF-α in coronary artery disease. Int J Mol Sci 2014; 16:535-46. [PMID: 25551602 PMCID: PMC4307261 DOI: 10.3390/ijms16010535] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 12/22/2014] [Indexed: 11/22/2022] Open
Abstract
Increasing evidences suggest that inflammation plays an important role in the pathogenesis of coronary artery disease (CAD). Numerous inflammatory cytokines and related genes mediate adverse cardiovascular events in patients with CAD, such as interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α), and Homer in the present study. The study was carried out on 163 CAD patients at different stages and 68 controls. The gene expression of Homer1, Homer2, Homer3, IL-1β, and TNF-α in the peripheral blood leukocytes were measured by real-time polymerase chain reaction. The mRNA levels of Homer1, IL-1β, and TNF-α in CAD patients were significantly higher than those in the control group, but not Homer2 and Homer3. However, there was no considerable difference in the mRNA levels of Homer1, IL-1β, and TNF-α among AMI, UAP, and SAP three subgroups of CAD. The receiver operating characteristic (ROC) curves showed that Homer1 had a better diagnostic value for UAP patients compared with IL-1β and TNF-α. Like IL-1β and TNF-α, Homer1 may also be an important participant of atherosclerotic plaque development and eventually rupture. The results of the present study may provide an important basis for diagnosing CAD patients, and provide new therapeutic targets for CAD.
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Münzer P, Schmid E, Walker B, Fotinos A, Chatterjee M, Rath D, Vogel S, Hoffmann SM, Metzger K, Seizer P, Geisler T, Gawaz M, Borst O, Lang F. Sphingosine kinase 1 (Sphk1) negatively regulates platelet activation and thrombus formation. Am J Physiol Cell Physiol 2014; 307:C920-7. [PMID: 25231106 DOI: 10.1152/ajpcell.00029.2014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Sphingosine 1-phosphate (S1P) is a powerful regulator of platelet formation. Enzymes generating S1P include sphingosine kinase 1. The present study thus explored the role of sphingosine kinase 1 in platelet formation and function. Activation-dependent platelet integrin αIIbβ3 activation and secretion of platelets lacking functional sphingosine kinase 1 (sphk1(-/-)) and of wild-type platelets (sphk1(+/+)) were determined utilizing flow cytometry and chronolume luciferin assay. Cytosolic Ca(2+) activity ([Ca(2+)]i) and aggregation were measured using fura-2 fluorescence and aggregometry, respectively. In vitro platelet adhesion and thrombus formation were evaluated using a flow chamber with shear rates of 1,700 s(-1). Activation-dependent increase of [Ca(2+)]i, degranulation (release of alpha and dense granules), integrin αIIbβ3 activation, and aggregation were all significantly increased in sphk1(-/-) platelets compared with sphk1(+/+) platelets. Moreover, while platelet adhesion and thrombus formation under arterial shear rates were significantly augmented in Sphk1-deficient platelets, bleeding time and blood count were unaffected in sphk1(-/-) mice. In conclusion, sphingosine kinase 1 is a powerful negative regulator of platelet function counteracting degranulation, aggregation, and thrombus formation.
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Affiliation(s)
- Patrick Münzer
- Department of Physiology, University of Tübingen, Tübingen, Germany
| | - Evi Schmid
- Department of Physiology, University of Tübingen, Tübingen, Germany
| | - Britta Walker
- Department of Physiology, University of Tübingen, Tübingen, Germany
| | - Anna Fotinos
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Madhumita Chatterjee
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Dominik Rath
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Sebastian Vogel
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Sascha M Hoffmann
- Department of Gynecology and Obstetrics, University of Tübingen, Tübingen, Germany
| | - Katja Metzger
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Peter Seizer
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Tobias Geisler
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Meinrad Gawaz
- Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Oliver Borst
- Department of Physiology, University of Tübingen, Tübingen, Germany. Department of Cardiology and Cardiovascular Medicine, University of Tübingen, Tübingen, Germany; and
| | - Florian Lang
- Department of Physiology, University of Tübingen, Tübingen, Germany.
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Hosseinzadeh Z, Schmid E, Shumilina E, Laufer S, Borst O, Gawaz M, Lang F. Effect of TGFβ on Na+/K+ ATPase activity in megakaryocytes. Biochem Biophys Res Commun 2014; 452:537-41. [DOI: 10.1016/j.bbrc.2014.08.093] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 08/20/2014] [Indexed: 11/26/2022]
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Borst O, Münzer P, Schmid E, Schmidt E, Russo A, Walker B, Yang W, Leibrock C, Szteyn K, Schmidt S, Elvers M, Faggio C, Shumilina E, Kuro‐o M, Gawaz M, Lang F. 1,25(OH)
2
vitamin D
3
‐dependent inhibition of platelet Ca
2+
signaling and thrombus formation in klotho‐deficient mice. FASEB J 2014; 28:2108-2119. [DOI: 10.1096/fj.13-239277] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Affiliation(s)
- Oliver Borst
- Department of Cardiology and Cardiovascular MedicineUniversity of TübingenTübingenGermany
- Department of PhysiologyUniversity of TübingenTübingenGermany
| | - Patrick Münzer
- Department of PhysiologyUniversity of TübingenTübingenGermany
| | - Evi Schmid
- Department of PhysiologyUniversity of TübingenTübingenGermany
| | - Eva‐Maria Schmidt
- Department of PhysiologyUniversity of TübingenTübingenGermany
- Department of Behavioral NeurobiologyUniversity of TübingenTübingenGermany
| | - Antonella Russo
- Department of PhysiologyUniversity of TübingenTübingenGermany
- Department of Biological and Environmental SciencesUniversity of MessinaSant'Agata‐MessinaItaly
| | - Britta Walker
- Department of PhysiologyUniversity of TübingenTübingenGermany
| | - Wenting Yang
- Department of PhysiologyUniversity of TübingenTübingenGermany
| | | | - Kalina Szteyn
- Department of PhysiologyUniversity of TübingenTübingenGermany
| | | | - Margitta Elvers
- Department of Cardiology and Cardiovascular MedicineUniversity of TübingenTübingenGermany
- Department of Clinical and Experimental HemostasisUniversity of DüsseldorfDüsseldorfGermany
| | - Caterina Faggio
- Department of Behavioral NeurobiologyUniversity of TübingenTübingenGermany
| | | | - Makoto Kuro‐o
- Department of PathologyUniversity of TexasDallasTexasUSA
| | - Meinrad Gawaz
- Department of Cardiology and Cardiovascular MedicineUniversity of TübingenTübingenGermany
| | - Florian Lang
- Department of PhysiologyUniversity of TübingenTübingenGermany
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Walker B, Towhid ST, Schmid E, Hoffmann SM, Abed M, Münzer P, Vogel S, Neis F, Brucker S, Gawaz M, Borst O, Lang F. Dynamic adhesion of eryptotic erythrocytes to immobilized platelets via platelet phosphatidylserine receptors. Am J Physiol Cell Physiol 2013; 306:C291-7. [PMID: 24284794 DOI: 10.1152/ajpcell.00318.2013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Glucose depletion of erythrocytes triggers suicidal erythrocyte death or eryptosis, which leads to cell membrane scrambling with phosphatidylserine exposure at the cell surface. Eryptotic erythrocytes adhere to endothelial cells by a mechanism involving phosphatidylserine at the erythrocyte surface and CXCL16 as well as CD36 at the endothelial cell membrane. Nothing has hitherto been known about an interaction between eryptotic erythrocytes and platelets, the decisive cells in primary hemostasis and major players in thrombotic vascular occlusion. The present study thus explored whether and how glucose-depleted erythrocytes adhere to platelets. To this end, adhesion of phosphatidylserine-exposing erythrocytes to platelets under flow conditions was examined in a flow chamber model at arterial shear rates. Platelets were immobilized on collagen and further stimulated with adenosine diphosphate (ADP, 10 μM) or thrombin (0.1 U/ml). As a result, a 48-h glucose depletion triggered phosphatidylserine translocation to the erythrocyte surface and augmented the adhesion of erythrocytes to immobilized platelets, an effect significantly increased upon platelet stimulation. Adherence of erythrocytes to platelets was blunted by coating of erythrocytic phosphatidylserine with annexin V or by neutralization of platelet phosphatidylserine receptors CXCL16 and CD36 with respective antibodies. In conclusion, glucose-depleted erythrocytes adhere to platelets. The adhesive properties of platelets are augmented by platelet activation. Erythrocyte adhesion to immobilized platelets requires phosphatidylserine at the erythrocyte surface and CXCL16 as well as CD36 expression on platelets. Thus platelet-mediated erythrocyte adhesion may foster thromboocclusive complications in diseases with stimulated phosphatidylserine exposure of erythrocytes.
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Affiliation(s)
- Britta Walker
- Department of Physiology, University of Tübingen, Tübingen, Germany
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42
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Münzer P, Borst O, Walker B, Schmid E, Feijge MAH, Cosemans JMEM, Chatterjee M, Schmidt EM, Schmidt S, Towhid ST, Leibrock C, Elvers M, Schaller M, Seizer P, Ferlinz K, May AE, Gulbins E, Heemskerk JWM, Gawaz M, Lang F. Acid sphingomyelinase regulates platelet cell membrane scrambling, secretion, and thrombus formation. Arterioscler Thromb Vasc Biol 2013; 34:61-71. [PMID: 24233488 DOI: 10.1161/atvbaha.112.300210] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Platelet activation is essential for primary hemostasis and acute thrombotic vascular occlusions. On activation, platelets release their prothrombotic granules and expose phosphatidylserine, thus fostering thrombin generation and thrombus formation. In other cell types, both degranulation and phosphatidylserine exposure are modified by sphingomyelinase-dependent formation of ceramide. The present study thus explored whether acid sphingomyelinase participates in the regulation of platelet secretion, phosphatidylserine exposure, and thrombus formation. APPROACH AND RESULTS Collagen-related peptide-induced or thrombin-induced ATP release and P-selectin exposure were significantly blunted in platelets from Asm-deficient mice (Smpd1(-/-)) when compared with platelets from wild-type mice (Smpd1(+/+)). Moreover, phosphatidylserine exposure and thrombin generation were significantly less pronounced in Smpd1(-/-) platelets than in Smpd1(+/+) platelets. In contrast, platelet integrin αIIbβ3 activation and aggregation, as well as activation-dependent Ca(2+) flux, were not significantly different between Smpd1(-/-) and Smpd1(+/+) platelets. In vitro thrombus formation at shear rates of 1700 s(-1) and in vivo thrombus formation after FeCl3 injury were significantly blunted in Smpd1(-/-) mice while bleeding time was unaffected. Asm-deficient platelets showed significantly reduced activation-dependent ceramide formation, whereas exogenous ceramide rescued diminished platelet secretion and thrombus formation caused by Asm deficiency. Treatment of Smpd1(+/+) platelets with bacterial sphingomyelinase (0.01 U/mL) increased, whereas treatment with functional acid sphingomyelinase-inhibitors, amitriptyline or fluoxetine (5 μmol/L), blunted activation-dependent platelet degranulation, phosphatidylserine exposure, and thrombus formation. Impaired degranulation and thrombus formation of Smpd1(-/-) platelets were again overcome by exogenous bacterial sphingomyelinase. CONCLUSIONS Acid sphingomyelinase is a completely novel element in the regulation of platelet plasma membrane properties, secretion, and thrombus formation.
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Affiliation(s)
- Patrick Münzer
- From the Departments of Physiology (P.M., O.B., B.W., E.S., E.-M.S., S.S., S.T.T., C.L., F.L.), Cardiology and Cardiovascular Medicine (O.B., M.C., M.E., P.S., A.E.M., M.G.), and Dermatology (M.S.), University of Tübingen, Germany; Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands (M.A. H.F., J.M.E.M.C., J.W.M.H.); Bristol-Myers Squibb GmbH&CoKGaA, Munich, Germany (K.F.); Institute of Molecular Biology, University of Duisburg-Essen, Essen, Germany (E.G.); and Department of Clinical and Experimental Hemostasis, Heinrich Heine University Düsseldorf, Düsseldorf, Germany (M.E.)
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Langer HF, Weber C, Gawaz M. The platelet--thrombosis and beyond. Thromb Haemost 2013; 110:857-8. [PMID: 24108387 DOI: 10.1160/th13-09-0805] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 10/02/2013] [Indexed: 11/05/2022]
Affiliation(s)
- H F Langer
- Harald F. Langer, MD, Department of Cardiology and Cardiovascular Medicine, University Clinic of Tuebingen, Ottfried-Müller-Str. 10, 72076 Tuebingen, Germany, E-mail:
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