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Le NTN, Han CL, Delila L, Nebie O, Chien HT, Wu YW, Buée L, Blum D, Burnouf T. Proteomics of human platelet lysates and insight from animal studies on platelet protein diffusion to hippocampus upon intranasal administration. APL Bioeng 2024; 8:026111. [PMID: 38726021 PMCID: PMC11080963 DOI: 10.1063/5.0196553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 04/23/2024] [Indexed: 05/12/2024] Open
Abstract
Human platelet lysates (HPLs) from allogeneic platelet concentrates (PCs) are biomaterials, which are rich in various trophic factors, increasingly used in regenerative medicine and biotherapy. Understanding how preparation methods influence the HPL protein profile, biological function, and clinical outcomes is crucial. Our study sheds light on the proteomes and functionality of different HPLs, with the aim of advancing their scientifically grounded clinical applications. To achieve this, PCs suspended in plasma underwent three distinct processing methods, resulting in seven HPL types. We used three characterization techniques: label-free proteomics and tandem mass tag (TMT)-based quantitative proteomics, both before and after the immunodepletion of abundant plasma proteins. Bioinformatic tools assessed the proteome, and western blotting validated our quantitative proteomics data. Subsequent pre-clinical studies with fluorescent labeling and label-free proteomics were used as a proof of concept for brain diffusion. Our findings revealed 1441 proteins detected using the label-free method, 952 proteins from the TMT experiment before and after depletion, and 1114 proteins from the subsequent TMT experiment on depleted HPLs. Most detected proteins were cytoplasmic, playing key roles in catalysis, hemostasis, and immune responses. Notably, the processing methodologies significantly influenced HPL compositions, their canonical pathways, and, consequently, their functionality. Each HPL exhibited specific abundant proteins, providing valuable insight for tailored clinical applications. Immunoblotting results for selected proteins corroborated our quantitative proteomics data. The diffusion and differential effects to the hippocampus of a neuroprotective HPL administered intranasally to mice were demonstrated. This proteomics study advances our understanding of HPLs, suggesting ways to standardize and customize their production for better clinical efficacy in regenerative medicine and biotherapy. Proteomic analyses also offered objective evidence that HPPL, upon intranasal delivery, not only effectively diffuses to the hippocampus but also alters protein expression in mice, bolstering its potential as a treatment for memory impairments.
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Affiliation(s)
- Nhi Thao Ngoc Le
- International Ph.D. Program in Biomedical Engineering, College of Biomedical Engineering, Taipei, Taiwan
| | - Chia-Li Han
- Master Program in Clinical Genomics and Proteomics, College of Pharmacy, Taipei Medical University, Taipei, Taiwan
| | - Liling Delila
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei, Taiwan
| | | | - Hsin-Tung Chien
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei, Taiwan
| | - Yu-Wen Wu
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei, Taiwan
| | | | - David Blum
- Authors to whom correspondence should be addressed: and . Tel.: +886 988 925 235
| | - Thierry Burnouf
- Authors to whom correspondence should be addressed: and . Tel.: +886 988 925 235
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Liu H, Welburn JPI. A circle of life: platelet and megakaryocyte cytoskeleton dynamics in health and disease. Open Biol 2024; 14:240041. [PMID: 38835242 DOI: 10.1098/rsob.240041] [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: 02/19/2024] [Accepted: 04/24/2024] [Indexed: 06/06/2024] Open
Abstract
Platelets are blood cells derived from megakaryocytes that play a central role in regulating haemostasis and vascular integrity. The microtubule cytoskeleton of megakaryocytes undergoes a critical dynamic reorganization during cycles of endomitosis and platelet biogenesis. Quiescent platelets have a discoid shape maintained by a marginal band composed of microtubule bundles, which undergoes remarkable remodelling during platelet activation, driving shape change and platelet function. Disrupting or enhancing this process can cause platelet dysfunction such as bleeding disorders or thrombosis. However, little is known about the molecular mechanisms underlying the reorganization of the cytoskeleton in the platelet lineage. Recent studies indicate that the emergence of a unique platelet tubulin code and specific pathogenic tubulin mutations cause platelet defects and bleeding disorders. Frequently, these mutations exhibit dominant negative effects, offering valuable insights into both platelet disease mechanisms and the functioning of tubulins. This review will highlight our current understanding of the role of the microtubule cytoskeleton in the life and death of platelets, along with its relevance to platelet disorders.
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Affiliation(s)
- Haonan Liu
- Wellcome Trust Centre for Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3BF, UK
| | - Julie P I Welburn
- Wellcome Trust Centre for Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3BF, UK
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O'Donoghue L, Smolenski A. Roles of G proteins and their GTPase-activating proteins in platelets. Biosci Rep 2024; 44:BSR20231420. [PMID: 38808367 PMCID: PMC11139668 DOI: 10.1042/bsr20231420] [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: 11/17/2023] [Revised: 04/30/2024] [Accepted: 05/02/2024] [Indexed: 05/30/2024] Open
Abstract
Platelets are small anucleate blood cells supporting vascular function. They circulate in a quiescent state monitoring the vasculature for injuries. Platelets adhere to injury sites and can be rapidly activated to secrete granules and to form platelet/platelet aggregates. These responses are controlled by signalling networks that include G proteins and their regulatory guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs). Recent proteomics studies have revealed the complete spectrum of G proteins, GEFs, and GAPs present in platelets. Some of these proteins are specific for platelets and very few have been characterised in detail. GEFs and GAPs play a major role in setting local levels of active GTP-bound G proteins in response to activating and inhibitory signals encountered by platelets. Thus, GEFs and GAPs are highly regulated themselves and appear to integrate G protein regulation with other cellular processes. This review focuses on GAPs of small G proteins of the Arf, Rab, Ras, and Rho families, as well as of heterotrimeric G proteins found in platelets.
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Affiliation(s)
- Lorna O'Donoghue
- UCD School of Medicine, University College Dublin, UCD Conway Institute, Belfield, Dublin 4, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, 123 St. Stephen’s Green 123, Dublin 2, Ireland
| | - Albert Smolenski
- UCD School of Medicine, University College Dublin, UCD Conway Institute, Belfield, Dublin 4, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, 123 St. Stephen’s Green 123, Dublin 2, Ireland
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Li OQ, Yue H, DeHart AR, Roytenberg R, Aguilar R, Olanipekun O, Bai F, Liu J, Fedorova O, Kennedy D, Thompson E, Pierre SV, Li W. Sodium/Potassium ATPase Alpha 1 Subunit Fine-tunes Platelet GPCR Signaling Function and is Essential for Thrombosis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.13.593923. [PMID: 38798556 PMCID: PMC11118499 DOI: 10.1101/2024.05.13.593923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Background Thrombosis is a major cause of myocardial infarction and ischemic stroke. The sodium/potassium ATPase (NKA), comprising α and β subunits, is crucial in maintaining intracellular sodium and potassium gradients. However, the role of NKA in platelet function and thrombosis remains unclear. Methods We utilized wild-type (WT, α1+/+) and NKA α1 heterozygous (α1+/-) mice, aged 8 to 16 weeks, of both sexes. An intravital microscopy-based, FeCl3-induced carotid artery injury thrombosis model was employed for in vivo thrombosis assessment. Platelet transfusion assays were used to evaluate platelet NKA α1 function on thrombosis. Human platelets isolated from healthy donors and heart failure patients treated with/without digoxin were used for platelet function and signaling assay. Complementary molecular approaches were used for mechanistic studies. Results NKA α1 haplodeficiency significantly reduced its expression on platelets without affecting sodium homeostasis. It significantly inhibited 7.5% FeCl3-induced thrombosis in male but not female mice without disturbing hemostasis. Transfusion of α1+/-, but not α1+/+, platelets to thrombocytopenic WT mice substantially prolonged thrombosis. Treating WT mice with low-dose ouabain or marinobufagenin, both binding NKA α1 and inhibiting its ion-transporting function, markedly inhibited thrombosis in vivo. NKA α1 formed complexes with leucine-glycine-leucine (LGL)-containing platelet receptors, including P2Y12, PAR4, and thromboxane A2 receptor. This binding was significantly attenuated by LGL>SFT mutation or LGL peptide. Haplodeficiency of NKA α1 in mice or ouabain treatment of human platelets notably inhibited ADP-induced platelet aggregation. While not affecting 10% FeCl3-induced thrombosis, NKA α1 haplodeficiency significantly prolonged thrombosis time in mice treated with an ineffective dose of clopidogrel. Conclusion NKA α1 plays an essential role in enhancing platelet activation through binding to LGL-containing platelet GPCRs. NKA α1 haplodeficiency or inhibition with low-dose ouabain and marinobufagenin significantly inhibited thrombosis and sensitized clopidogrel's anti-thrombotic effect. Targeting NKA α1 emerges as a promising antiplatelet and antithrombotic therapeutic strategy.
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Affiliation(s)
- Oliver Q. Li
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV, USA
| | - Hong Yue
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Autumn R. DeHart
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Renat Roytenberg
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Rodrigo Aguilar
- Department of Medicine, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Olalekan Olanipekun
- Department of Medicine, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Fang Bai
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Jiang Liu
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Olga Fedorova
- National Institute on Aging, Laboratory of Cardiovascular Science of Biomedical Research Center Baltimore, MD, USA
| | - David Kennedy
- Department of Medicine, University of Toledo, Toledo, OH, USA
| | - Ellen Thompson
- Department of Medicine, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| | - Sandrine V. Pierre
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
- Marshall Institute for Interdisciplinary Research, Marshall University, Huntington, WV, USA
| | - Wei Li
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
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Chen HL, Wang QY, Qi RM, Cai JP. Identification of the changes in the platelet proteomic profile of elderly individuals. Front Cardiovasc Med 2024; 11:1384679. [PMID: 38807946 PMCID: PMC11130443 DOI: 10.3389/fcvm.2024.1384679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Accepted: 05/01/2024] [Indexed: 05/30/2024] Open
Abstract
Background Platelet hyperreactivity is a risk factor for thrombosis in elderly patients with cardiovascular diseases. However, the mechanism of platelet hyperactivation has not been elucidated. This study aims to investigate alterations in the proteomes of platelets and their correlation with platelet hyperreactivity among elderly individuals. Methods This study included 10 young (28.1 ± 1.9 years), 10 middle-aged (60.4 ± 2.2 years), and 10 old (74.2 ± 3.0 years) subjects. Washed platelets were used in the present study. Platelet samples were analysed by using data-independent acquisition (DIA) quantitative mass spectrometry (MS). Results The results showed that the platelet proteomic profile exhibited high similarity between the young and middle-aged groups. However, there were significant differences in protein expression profiles between the old group and the young group. By exploring the dynamic changes in the platelet proteome with ageing, clusters of proteins that changed significantly with ageing were selected for further investigation. These clusters were related to the initial triggering of complement, phagosome and haemostasis based on enrichment analysis. We found that platelet degranulation was the major characteristic of the differentially expressed proteins between the old and young populations. Moreover, complement activation, the calcium signalling pathway and the nuclear factor-κB (NF-κB) signalling pathway were enriched in differentially expressed proteins. Conclusions The present study showed that there are obvious differences in the protein profiles of the elderly compared with young and middle-aged populations. The results provide novel evidence showing changes in platelet hyperactivity and susceptibility to thrombosis in the elderly population.
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Affiliation(s)
- Hui-Lian Chen
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology of National Health Commission, Beijing, China
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Qing-Yu Wang
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology of National Health Commission, Beijing, China
| | - Ruo-Mei Qi
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology of National Health Commission, Beijing, China
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Jian-Ping Cai
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology of National Health Commission, Beijing, China
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
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Thom CS, Davenport P, Fazelinia H, Soule-Albridge E, Liu ZJ, Zhang H, Feldman HA, Ding H, Roof J, Spruce LA, Ischiropoulos H, Sola-Visner M. Quantitative label-free mass spectrometry reveals content and signaling differences between neonatal and adult platelets. J Thromb Haemost 2024; 22:1447-1462. [PMID: 38160730 PMCID: PMC11055671 DOI: 10.1016/j.jtha.2023.12.022] [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: 06/30/2023] [Revised: 12/04/2023] [Accepted: 12/13/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND Recent clinical studies have shown that transfusions of adult platelets increase morbidity and mortality in preterm infants. Neonatal platelets are hyporesponsive to agonist stimulation, and emerging evidence suggests developmental differences in platelet immune functions. OBJECTIVES This study was designed to compare the proteome and phosphoproteome of resting adult and neonatal platelets. METHODS We isolated resting umbilical cord blood-derived platelets from healthy full-term neonates (n = 8) and resting blood platelets from healthy adults (n = 6) and compared protein and phosphoprotein contents using data-independent acquisition mass spectrometry. RESULTS We identified 4770 platelet proteins with high confidence across all samples. Adult and neonatal platelets were clustered separately by principal component analysis. Adult platelets were significantly enriched in immunomodulatory proteins, including β2 microglobulin and CXCL12, whereas neonatal platelets were enriched in ribosomal components and proteins involved in metabolic activities. Adult platelets were enriched in phosphorylated GTPase regulatory enzymes and proteins participating in trafficking, which may help prime them for activation and degranulation. Neonatal platelets were enriched in phosphorylated proteins involved in insulin growth factor signaling. CONCLUSION Using label-free data-independent acquisition mass spectrometry, our findings expanded the known neonatal platelet proteome and identified important differences in protein content and phosphorylation between neonatal and adult platelets. These developmental differences suggested enhanced immune functions for adult platelets and presence of molecular machinery related to platelet activation. These findings are important to understanding mechanisms underlying key platelet functions as well as the harmful effects of adult platelet transfusions given to preterm infants.
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Affiliation(s)
- Christopher S Thom
- Division of Neonatology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA; Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
| | - Patricia Davenport
- Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Hossein Fazelinia
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Erin Soule-Albridge
- Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Zhi-Jian Liu
- Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Haorui Zhang
- Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Henry A Feldman
- Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts, USA; Institutional Centers for Clinical and Translational Research, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Hua Ding
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Jennifer Roof
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Lynn A Spruce
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Harry Ischiropoulos
- Division of Neonatology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA; Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania, USA
| | - Martha Sola-Visner
- Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts, USA.
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Weber S, Arnold JBZ, Sachs UJ, Luppa PB. Recombinantly Expressed Tagged SUrface Protein (RETSUP) assay: a new diagnostic system for the detection of antibodies to platelets. J Thromb Haemost 2024; 22:1187-1201. [PMID: 38184205 DOI: 10.1016/j.jtha.2023.12.030] [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: 10/26/2023] [Revised: 12/11/2023] [Accepted: 12/28/2023] [Indexed: 01/08/2024]
Abstract
BACKGROUND Current assays for the detection of (allo)antibodies to platelet antigens are often laborious and widely based on the presence of well-characterized donor platelets. OBJECTIVES To develop an easy-to-perform, sensitive, and specific test for the detection of antibodies against platelet antigens, in particular, glycoprotein (GP) antigens, called "Recombinantly Expressed Tagged SUrface Protein" (RETSUP) assay, which does not require donor platelets. METHODS Twin-Strep-tagged GP complexes were recombinantly expressed in human embryonic kidney 293 cells after stable transfection. These cell lines were used as antigen sources in the RETSUP assay, combining cell-based and enzyme-linked immunosorbent assay-based assay procedures. The assay performance was tested with recombinant antibodies, anti-human platelet antigen (HPA) reference plasmas, and anti-HPA patient sera. RESULTS Human embryonic kidney 293 cell lines stably expressing either Twin-Strep-labeled GPIa/IIa, GPIIb/IIIa, GPIb/IX, or GPIb/IX/V complexes or GPV as well as the distinct HPA-1, HPA-3, and HPA-5 epitopes were successfully generated. Applying the generated GP-expressing cell lines, the developed RETSUP assay proved very sensitive and specific with recombinant antibodies targeting different GPs and human plasma/serum samples. The results of the test were not affected by the GP carrying the Twin-Strep-tag or by using freshly harvested or cryopreserved cells. CONCLUSION The RETSUP assay is an easy-to-perform, sensitive, and specific assay for the detection of plasma/serum antibodies to platelet GP, with performance comparable to or better than those of current state-of-the-art assays in antiplatelet antibody diagnostics. Owing to the recombinant nature of the target antigens, it can be easily adapted to detect antibodies in other antibody-mediated diseases.
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Affiliation(s)
- Susanne Weber
- Institute of Clinical Chemistry and Pathobiochemistry, Klinikum rechts der Isar of the Technische Universität München, Munich, Germany.
| | - Jasmin Birgit Zuzana Arnold
- Institute of Clinical Chemistry and Pathobiochemistry, Klinikum rechts der Isar of the Technische Universität München, Munich, Germany
| | - Ulrich Jörg Sachs
- Institute for Clinical Immunology, Transfusion Medicine, and Haemostasis, Justus Liebig University, Giessen, Germany; Department of Thrombosis and Haemostasis, Giessen University Hospital, Giessen, Germany
| | - Peter Bruno Luppa
- Institute of Clinical Chemistry and Pathobiochemistry, Klinikum rechts der Isar of the Technische Universität München, Munich, Germany
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Muret C, Crettaz D, Alberio L, Prudent M. Increase of Phosphoprotein Expressions in Amotosalen/UVA-Treated Platelet Concentrates. Transfus Med Hemother 2024; 51:101-110. [PMID: 38584699 PMCID: PMC10996061 DOI: 10.1159/000535060] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 11/05/2023] [Indexed: 04/09/2024] Open
Abstract
Background Pathogen inactivation treatment (PIT) has been shown to alter platelet function, phenotype, morphology and to induce a faster aging of platelet concentrates (PCs). Key pieces of information are still missing to understand the impacts of PITs at the cellular level. Objectives This study investigated the impact of amotosalen/UVA on PCs, from a post-translational modifications (PTM) point of view. Phosphoproteomic analyses were conducted on resting platelets, right after the amotosalen/UVA treatment and compared with untreated PCs. Method A two-arm study setting was carried out to compare PIT (amotosalen/UVA) to untreated PCs, on day 1 post-donation. Based on a pool-and-split approach, 12 PCs were split into two groups (treated and untreated). Quantitative phosphoproteomics was performed using TMT technology to study the changes of phosphoproteins right after the PIT. Results A total of 3,906 proteins and 7,334 phosphosites were identified, and 2,473 proteins and 2,214 phosphosites were observed in at least 5 to 6 replicates. Compared to untreated platelets, PIT platelets exhibited an upregulation of the phosphorylation effects, with 109 phosphosites identified with a higher than 2-fold change. Two pathways were clearly identified. The mitogen activated protein kinases (MAPKs) cascade, which triggers the granule secretion and the activation of the pS15 HSPB1. One of the shape change pathways was also observed with the inhibition of the Threonine 18 and Serine 19 phosphorylations on myosin light chain (MLC) protein after the amotosalen/UVA treatment. Conclusions This work provides a deep insight into the impact of amotosalen/UVA treatment from a phosphoprotein viewpoint on resting platelets. Clear changes in phosphorylation of proteins belonging to different platelet pathways were quantified. This discovery corroborates previous findings and fills missing parts of the effect of photochemical treatments on platelets.
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Affiliation(s)
- Charlotte Muret
- Laboratoire de Recherche sur Les Produits Sanguins, Transfusion Interrégionale CRS, Epalinges, Switzerland
| | - David Crettaz
- Laboratoire de Recherche sur Les Produits Sanguins, Transfusion Interrégionale CRS, Epalinges, Switzerland
| | - Lorenzo Alberio
- Division of Hematology and Central Hematology Laboratory, CHUV, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - Michel Prudent
- Laboratoire de Recherche sur Les Produits Sanguins, Transfusion Interrégionale CRS, Epalinges, Switzerland
- Center for Research and Innovation in Clinical Pharmaceutical Sciences, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva, Switzerland
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Acebes-Huerta A, Martínez-Botía P, Carbajo-Argüelles G, Fernández-Fuertes J, Muñoz-Turrillas MC, Ojea-Pérez AM, López-Vázquez A, Eble JA, Gutiérrez L. Characterization of the molecular composition and in vitro regenerative capacity of platelet-based bioproducts and related subfractions. Acta Biomater 2024; 177:132-147. [PMID: 38311196 DOI: 10.1016/j.actbio.2024.01.029] [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: 03/13/2023] [Revised: 12/29/2023] [Accepted: 01/19/2024] [Indexed: 02/10/2024]
Abstract
The use and demand of platelet-based bioproducts in regenerative medicine is steadily increasing. However, it is very difficult to establish the real clinical benefits of these therapies, as the lack of characterization and detailed production methods of platelet-based bioproducts persists in the literature and precludes cross-study comparisons. We characterized the molecular composition and in vitro regenerative capacity of platelet-rich plasma (PRP) produced in a closed-system. Furthermore, we performed a parallel characterization on different PRP subfractions (plasma and plasma-free platelet lysate), identifying that the fractions containing platelet-derived cargo exert the most potent regenerative capacity. This observation led us to develop a method to obtain a platelet secretome highly enriched in growth factors, free of plasma and cellular components (PCT/IB2022/057936), with the aim of establishing a superior bioproduct. The molecular characterization of secretomes revealed agonist-dependent differences, which correlates with beneficial grades of regenerative capacity. Importantly, secretomes showed general superiority to PRP in vitro. We discuss the variables influencing the bioproduct quality (inter-donor variation, platelet source and processing methods). Finally, we propose that the characteristics of secretomes circumvents certain limitations of PRP (autologous vs allogeneic), and envision that optimizing post-processing protocols (nanoencapsulation, lyophilization), would allow their clinical application even beyond regenerative medicine. STATEMENT OF SIGNIFICANCE: The use and demand of platelet-based bioproducts in regenerative medicine is steadily increasing. However, it is very difficult to establish the real clinical benefits of these therapies, or to improve/personalize them, as the lack of characterization of the bioproducts and their production methods is a constant in the literature, reason that precludes cross-study comparisons. In the present manuscript, we provide a comprehensive molecular and functional characterization of platelet-based bioproducts and subfractions, including platelet rich plasma, plasma fractions and platelet secretomes produced with a methodology developed by our group. Our results show that the molecular composition of each fraction correlates with its regenerative capacity in vitro. Thus, a rigorous characterization of platelet-derived bioproducts will potentially allow universal use, customizing and new applications.
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Affiliation(s)
- Andrea Acebes-Huerta
- Platelet Research Lab, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain; Department of Medicine, University of Oviedo, Spain
| | - Patricia Martínez-Botía
- Platelet Research Lab, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain
| | - Graciela Carbajo-Argüelles
- Platelet Research Lab, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain
| | - Judit Fernández-Fuertes
- Platelet Research Lab, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain; Department of Orthopedics and Trauma Surgery, Hospital Universitario Central de Asturias (HUCA), Oviedo, Spain; Department of Surgery and Medical Surgical Specialties, University of Oviedo, Spain
| | - María Carmen Muñoz-Turrillas
- Platelet Research Lab, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain; Centro Regional de Transfusión de Toledo-Guadalajara, Spain
| | | | - Antonio López-Vázquez
- Department of Immunology, Hospital Universitario Central de Asturias (HUCA), Oviedo, Spain
| | - Johannes A Eble
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Germany
| | - Laura Gutiérrez
- Platelet Research Lab, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain; Department of Medicine, University of Oviedo, Spain.
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Garzon Dasgupta AK, Martyanov AA, Ignatova AA, Zgoda VG, Novichkova GA, Panteleev MA, Sveshnikova AN. Comparison of platelet proteomic profiles between children and adults reveals origins of functional differences. Pediatr Res 2024; 95:966-973. [PMID: 37872237 DOI: 10.1038/s41390-023-02865-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 07/25/2023] [Accepted: 09/26/2023] [Indexed: 10/25/2023]
Abstract
BACKGROUND Platelets are blood cells responsible for the prevention of blood loss upon vessel wall disruption. It has been demonstrated that platelet functioning differs significantly between adult and pediatric donors. This study aimed to identify potential differences between the protein composition of platelets of pediatric, adolescent, and adult donors. METHODS Platelet functional testing was conducted with live cell flow cytometry. Using a straightforward approach to platelet washing based on the sequential platelets centrifugation-resuspension, we were able to obtain stable and robust proteomics results, which corresponded to previously published data. RESULTS We have identified that pediatric donors' platelets have increased amounts of proteins, responsible for mitochondrial activity, proteasome activity, and vesicle transport. Flow cytometry analysis of platelet intracellular signaling and functional responses revealed that platelets of the pediatric donors have diminished granule secretion and increased quiescent platelet calcium concentration and decreased calcium mobilization in response to ADP. We could explain the observed changes in calcium responses by the increased mitochondria protein content, and the changes in granule secretion could be explained by the differences in vesicle transport protein content. CONCLUSIONS Therefore, we can conclude that the age-dependence of platelet functional responses originates from the difference in platelet protein content. IMPACT Platelets of infants are known to functionally differ from the platelet of adult donors, although the longevity and persistivity of these differences are debatable. Pediatric donor platelets have enhanced amounts of mitochondrial, proteasomal, and vesicle transport proteins. Platelets of the pediatric donors had increased cytosolic calcium in the resting state, what is explained by the increased numbers of mitochondrial proteins. Infants had decreased platelet granule release, which resolved upon adolescence. Thus, platelets of the infants should be assessed differently from adult platelets. Differences in platelet proteomic contents persisted in adolescent groups, yet, no significant differences in platelet function were observed.
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Affiliation(s)
- Andrei K Garzon Dasgupta
- Center for Theoretical Problems of Physico-Сhemical Pharmacology, Russian Academy of Sciences, 30 Srednyaya Kalitnikovskaya str., Moscow, 109029, Russia
| | - Alexey A Martyanov
- Center for Theoretical Problems of Physico-Сhemical Pharmacology, Russian Academy of Sciences, 30 Srednyaya Kalitnikovskaya str., Moscow, 109029, Russia
- National Medical Research Centеr of Pediatric Hematology, Oncology and Immunology named after Dmitry Rogachev, 1 Samory Mashela St, Moscow, 117198, Russia
| | - Anastasia A Ignatova
- Center for Theoretical Problems of Physico-Сhemical Pharmacology, Russian Academy of Sciences, 30 Srednyaya Kalitnikovskaya str., Moscow, 109029, Russia
- National Medical Research Centеr of Pediatric Hematology, Oncology and Immunology named after Dmitry Rogachev, 1 Samory Mashela St, Moscow, 117198, Russia
| | - Victor G Zgoda
- Institute of Biomedical Chemistry, 10 bld. 8, Pogodinskaya str., 119121, Moscow, Russia
| | - Galina A Novichkova
- National Medical Research Centеr of Pediatric Hematology, Oncology and Immunology named after Dmitry Rogachev, 1 Samory Mashela St, Moscow, 117198, Russia
| | - Mikhail A Panteleev
- Center for Theoretical Problems of Physico-Сhemical Pharmacology, Russian Academy of Sciences, 30 Srednyaya Kalitnikovskaya str., Moscow, 109029, Russia
- National Medical Research Centеr of Pediatric Hematology, Oncology and Immunology named after Dmitry Rogachev, 1 Samory Mashela St, Moscow, 117198, Russia
- Lomonosov Moscow State University, 1/2 Leninskie gory, Moscow, 119991, Russia
| | - Anastasia N Sveshnikova
- Center for Theoretical Problems of Physico-Сhemical Pharmacology, Russian Academy of Sciences, 30 Srednyaya Kalitnikovskaya str., Moscow, 109029, Russia.
- National Medical Research Centеr of Pediatric Hematology, Oncology and Immunology named after Dmitry Rogachev, 1 Samory Mashela St, Moscow, 117198, Russia.
- Lomonosov Moscow State University, 1/2 Leninskie gory, Moscow, 119991, Russia.
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11
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Lu J, Zhang C, Shi S, Li S, Liu J, Wu J, Huang C, Lei M. Stoichiometry and architecture of the platelet membrane complex glycoprotein Ib-IX-V. Biol Chem 2024; 405:91-104. [PMID: 36942505 DOI: 10.1515/hsz-2022-0227] [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: 07/12/2022] [Accepted: 03/06/2023] [Indexed: 03/23/2023]
Abstract
Glycoprotein (GP) Ib-IX-V is the second most abundant platelet receptor for thrombin and other ligands crucial for hemostasis and thrombosis. Its activity is involved in platelet adhesion to vascular injury sites and thrombin-induced platelet aggregation. GPIb-IX-V is a heteromeric complex composed of four subunits, GPIbα, GPIbβ, GPV and GPIX, in a stoichiometric ratio that has been wildly debated. Despite its important physiological roles, the overall structure and molecular arrangement of GPIb-IX-V are not yet fully understood. Here, we purify stable and functional human GPIb-IX-V complex from reconstituted EXPi293F cells in high homogeneity, and perform biochemical and structural characterization of this complex. Single-particle cryo-electron microscopy structure of GPIb-IX-V is determined at ∼11 Å resolution, which unveils the architecture of GPIb-IX-V and its subunit organization. Size-exclusion chromatography-multi-angle static light scattering analysis reveals that GPIb-IX-V contains GPIb-IX and GPV at a 1:1 stoichiometric ratio and surface plasmon resonance assays show that association of GPV leads to slow kinetics of thrombin binding to GPIb-IX-V. Taken together, our results provide the first three-dimensional architecture of the intact GPIb-IX-V complex, which extends our understanding of the structure and functional mechanism of this complex in hemostasis and thrombosis.
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Affiliation(s)
- Juanjuan Lu
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Institute of Precision Medicine, Shanghai, China
| | - Chunli Zhang
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Institute of Precision Medicine, Shanghai, China
| | - Shaohua Shi
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Institute of Precision Medicine, Shanghai, China
| | - Shaobai Li
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Institute of Precision Medicine, Shanghai, China
| | - Junling Liu
- Department of Biochemistry and Molecular Cell Biology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jian Wu
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Institute of Precision Medicine, Shanghai, China
| | - Chenhui Huang
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Institute of Precision Medicine, Shanghai, China
| | - Ming Lei
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Institute of Precision Medicine, Shanghai, China
- State Key laboratory of Oncogenes and Related Genes, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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12
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Trivigno SMG, Vismara M, Canobbio I, Rustichelli S, Galvagni F, Orlandini M, Torti M, Guidetti GF. The C-Type Lectin Receptor CD93 Regulates Platelet Activation and Surface Expression of the Protease Activated Receptor 4. Thromb Haemost 2024; 124:122-134. [PMID: 37669782 DOI: 10.1055/a-2166-5841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
BACKGROUND The C-type lectin receptor CD93 is a single pass type I transmembrane glycoprotein involved in inflammation, immunity, and angiogenesis. This study investigates the role of CD93 in platelet function. CD93 knockout (KO) mice and wild-type (WT) controls were compared in this study. METHODS Platelet activation and aggregation were investigated by flow cytometry and light transmission aggregometry, respectively. Protein expression and phosphorylation were analyzed by immunoblotting. Subcellular localization of membrane receptors was investigated by wide-field and confocal microscopy. RESULTS The lack of CD93 in mice was not associated to any evident bleeding defect and no alterations of platelet activation were observed upon stimulation with thromboxane A2 analogue and convulxin. Conversely, platelet aggregation induced by stimulation of the thrombin receptor PAR4 was significantly reduced in the absence of CD93. This defect was associated with a significant reduction of α-granule secretion, integrin αIIbβ3 activation, and protein kinase C (PKC) stimulation. Resting WT and CD93-deficient platelets expressed comparable amounts of PAR4. However, upon stimulation with a PAR4 activating peptide, a more pronounced clearance of PAR4 from the platelet surface was observed in CD93-deficient platelets compared with WT controls. Confocal microscopy analysis revealed a massive movement of PAR4 in cytosolic compartments of activated platelets lacking CD93. Accordingly, platelet desensitization following PAR4 stimulation was more pronounced in CD93 KO platelets compared with WT controls. CONCLUSION These results demonstrate that CD93 supports platelet activation triggered by PAR4 stimulation and is required to stabilize the expression of the thrombin receptor on the cell surface.
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Affiliation(s)
- Silvia Maria Grazia Trivigno
- University School for Advanced Studies IUSS, Pavia, Italy
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | - Mauro Vismara
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Ilaria Canobbio
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | - Serena Rustichelli
- University School for Advanced Studies IUSS, Pavia, Italy
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | - Federico Galvagni
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Maurizio Orlandini
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy
| | - Mauro Torti
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy
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13
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Haji Begli N, Freund C, Weiss KH, Gotthardt D, Wannhoff A. Comparative proteomics reveals different protein expression in platelets in patients with alcoholic liver cirrhosis. Proteome Sci 2024; 22:3. [PMID: 38279183 PMCID: PMC10811856 DOI: 10.1186/s12953-024-00227-y] [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: 10/16/2022] [Accepted: 01/02/2024] [Indexed: 01/28/2024] Open
Abstract
BACKGROUND The role of platelets in disease progression as well as the function of platelets as part of the haemostatic and immunological system in patients with liver cirrhosis is only incompletely understood. This is partly due to difficulties in assessing platelet function. Proteome analyses of platelets have been used to further investigate the role of platelets in other diseases. AIM To assess possible changes in the platelet proteome during different stages of alcohol induced liver cirrhosis compared to healthy donors. PATIENTS AND METHODS A 45 ml blood sample was drawn from 18 participants aged 18-80 years evenly divided into three groups of healthy donors, patients with less advanced alcohol induced liver cirrhosis (Child-Pugh < 7) and patients with advanced liver cirrhosis (Child-Pugh > 10). The blood was processed to isolate platelets and perform subsequent two-dimensional gel-electrophoresis using a SYPRO™ Ruby dye. After computational analysation significantly in- or decreased protein spots (defined as a two-fold abundance change between different study cohorts and ANOVA < 0.05) were identified via liquid chromatography-mass spectrometry (LCMS) and searching against human protein databases. RESULTS The comparative analysis identified four platelet proteins with progressively decreased protein expression in patients with liver cirrhosis. More specifically Ras-related protein Rab-7a (Rab-7a), Ran-specific binding protein 1 (RANBP1), Rho GDP-dissociation inhibitor 1 (RhoGDI1), and 14-3-3 gamma. CONCLUSION There is significant change in protein expression in the platelet proteome throughout the disease progression of alcohol induced liver cirrhosis. The identified proteins are possibly involved in haemostatic and immunoregulatory function of platelets.
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Affiliation(s)
- Nima Haji Begli
- Department of Internal Medicine IV, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Cora Freund
- Department of Internal Medicine IV, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Karl-Heinz Weiss
- Salem Medical Center, Zeppelinstr. 11-33, 69120, Heidelberg, Germany
| | - Daniel Gotthardt
- Department of Internal Medicine IV, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Andreas Wannhoff
- Department of Internal Medicine IV, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
- Department of Internal Medicine and Gastroenterology, Hospital Ludwigsburg, Posilipostrasse 4, 71640, Ludwigsburg, Germany.
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14
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Zhou Y, Dong J, Wang M, Liu Y. New insights of platelet endocytosis and its implication for platelet function. Front Cardiovasc Med 2024; 10:1308170. [PMID: 38264257 PMCID: PMC10803655 DOI: 10.3389/fcvm.2023.1308170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 12/21/2023] [Indexed: 01/25/2024] Open
Abstract
Endocytosis constitutes a cellular process in which cells selectively encapsulate surface substances into endocytic vesicles, also known as endosomes, thereby modulating their interaction with the environment. Platelets, as pivotal hematologic elements, play a crucial role not only in regulating coagulation and thrombus formation but also in facilitating tumor invasion and metastasis. Functioning as critical components in the circulatory system, platelets can internalize various endosomal compartments, such as surface receptors, extracellular proteins, small molecules, and pathogens, from the extracellular environment through diverse endocytic pathways, including pinocytosis, phagocytosis, and receptor-mediated endocytosis. We summarize recent advancements in platelet endocytosis, encompassing the catalog of cargoes, regulatory mechanisms, and internal trafficking routes. Furthermore, we describe the influence of endocytosis on platelet regulatory functions and related physiological and pathological processes, aiming to offer foundational insights for future research into platelet endocytosis.
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Affiliation(s)
- Yangfan Zhou
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Jianzeng Dong
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
- National Clinical Research Centre for Cardiovascular Diseases, Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Mengyu Wang
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Yangyang Liu
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
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15
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Buka RJ, Montague SJ, Moran LA, Martin EM, Slater A, Watson SP, Nicolson PLR. PF4 activates the c-Mpl-Jak2 pathway in platelets. Blood 2024; 143:64-69. [PMID: 37883794 PMCID: PMC10862235 DOI: 10.1182/blood.2023020872] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 08/03/2023] [Accepted: 08/22/2023] [Indexed: 10/28/2023] Open
Abstract
ABSTRACT Platelet factor 4 (PF4) is an abundant chemokine that is released from platelet α-granules on activation. PF4 is central to the pathophysiology of vaccine-induced immune thrombocytopenia and thrombosis (VITT) in which antibodies to PF4 form immune complexes with PF4, which activate platelets and neutrophils through Fc receptors. In this study, we show that PF4 binds and activates the thrombopoietin receptor, cellular myeloproliferative leukemia protein (c-Mpl), on platelets. This leads to the activation of Janus kinase 2 (JAK2) and phosphorylation of signal transducer and activator of transcription (STAT) 3 and STAT5, leading to platelet aggregation. Inhibition of the c-Mpl-JAK2 pathway inhibits platelet aggregation to PF4, VITT sera, and the combination of PF4 and IgG isolated from VITT patient plasma. The results support a model in which PF4-based immune complexes activate platelets through binding of the Fc domain to FcγRIIA and PF4 to c-Mpl.
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Affiliation(s)
- Richard J. Buka
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Samantha J. Montague
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, Birmingham and Nottingham, United Kingdom
| | - Luis A. Moran
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Eleyna M. Martin
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, Birmingham and Nottingham, United Kingdom
| | - Alexandre Slater
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, Birmingham and Nottingham, United Kingdom
| | - Steve P. Watson
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, Birmingham and Nottingham, United Kingdom
| | - Phillip L. R. Nicolson
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Department of Haematology, University Hospitals Birmingham National Health Service Foundation Trust, Birmingham, United Kingdom
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16
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Martin EM, Clark JC, Montague SJ, Morán LA, Di Y, Bull LJ, Whittle L, Raka F, Buka RJ, Zafar I, Kardeby C, Slater A, Watson SP. Trivalent nanobody-based ligands mediate powerful activation of GPVI, CLEC-2, and PEAR1 in human platelets whereas FcγRIIA requires a tetravalent ligand. J Thromb Haemost 2024; 22:271-285. [PMID: 37813196 DOI: 10.1016/j.jtha.2023.09.026] [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: 08/07/2023] [Revised: 09/19/2023] [Accepted: 09/27/2023] [Indexed: 10/11/2023]
Abstract
BACKGROUND Clustering of the receptors glycoprotein receptor VI (GPVI), C-type lectin-like receptor 2 (CLEC-2), low-affinity immunoglobulin γ Fc region receptor II-a (FcγRIIA), and platelet endothelial aggregation receptor 1 (PEAR1) leads to powerful activation of platelets through phosphorylation of tyrosine in their cytosolic tails and initiation of downstream signaling cascades. GPVI, CLEC-2, and FcγRIIA signal through YxxL motifs that activate Syk. PEAR1 signals through a YxxM motif that activates phosphoinositide 3-kinase. Current ligands for these receptors have an undefined valency and show significant batch variation and, for some, uncertain specificity. OBJECTIVES We have raised nanobodies against each of these receptors and multimerized them to identify the minimum number of epitopes to achieve robust activation of human platelets. METHODS Divalent and trivalent nanobodies were generated using a flexible glycine-serine linker. Tetravalent nanobodies utilize a mouse Fc domain (IgG2a, which does not bind to FcγRIIA) to dimerize the divalent nanobody. Ligand affinity measurements were determined by surface plasmon resonance. Platelet aggregation, adenosine triphosphate secretion, and protein phosphorylation were analyzed using standardized methods. RESULTS Multimerization of the nanobodies led to a stepwise increase in affinity with divalent and higher-order nanobody oligomers having sub-nanomolar affinity. The trivalent nanobodies to GPVI, CLEC-2, and PEAR1 stimulated powerful and robust platelet aggregation, secretion, and protein phosphorylation at low nanomolar concentrations. A tetravalent nanobody was required to activate FcγRIIA with the concentration-response relationship showing a greater variability and reduced sensitivity compared with the other nanobody-based ligands, despite a sub-nanomolar binding affinity. CONCLUSION The multivalent nanobodies represent a series of standardized, potent agonists for platelet glycoprotein receptors. They have applications as research tools and in clinical assays.
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Affiliation(s)
- Eleyna M Martin
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK.
| | - Joanne C Clark
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK; Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK
| | - Samantha J Montague
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Luis A Morán
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Ying Di
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Lily J Bull
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Luke Whittle
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Florije Raka
- Institute for Transfusion Medicine-Skopje, Skopje, North Macedonia
| | - Richard J Buka
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Idrees Zafar
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Caroline Kardeby
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK; Current address: School of Biosciences, College of Health and Life Sciences, Aston University, Birmingham, UK
| | - Alexandre Slater
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Steve P Watson
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham, UK; Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK.
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17
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Authi KS, Khan S, Gibbins JM, Brain SD. Evidence that inositol 1,4,5-trisphosphate 3-kinase and inositol 1,3,4,5-tetrakisphosphate are negative regulators of platelet function. Res Pract Thromb Haemost 2024; 8:102326. [PMID: 38404940 PMCID: PMC10885593 DOI: 10.1016/j.rpth.2024.102326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 12/21/2023] [Accepted: 01/03/2024] [Indexed: 02/27/2024] Open
Abstract
Background Inositol 1,3,4,5-tetrakisphosphate (IP4) is formed from inositol 1,4,5-trisphosphate (IP3) by IP3 3-kinase (ITPK) in most cells. Its function is unknown but has been suggested to be involved in Ca2+ entry, IP3 regulation, and phosphoinositide 3-kinase antagonism. Objectives To better elucidate a function for IP4, we tested a specific inhibitor of ITPK (GNF362) on platelets, the effects of IP4 directly in permeabilized platelets and its effect on phosphatidylinositol 3,4,5-trisphosphate (PIP3) binding to pleckstrin-homology (PH) domain-containing proteins in platelets. Methods Human platelets were utilized in whole blood for thrombus formation, in platelet-rich plasma and washed suspensions for aggregation, and for Ca2+ studies, or resuspended in high K+ and low Na+ buffers for permeabilization experiments. Phosphorylation of AKT-Ser473 and Rap1-GTP formation were measured by Western blotting and PIP3 binding using PIP3 beads. Results GNF362-enhanced platelet aggregation stimulated by low concentrations of ADP, collagen, thrombin, U46619, and thrombus formation in collagen-coated capillaries. GNF362 induced a transient elevation of Ca2+ concentration, elevated basal levels of IP3, and enhanced the peak height of Ca2+ elevated by agonists. In permeabilized platelets, IP4 inhibited GTPγS induced formation of AKT-Ser473 phosphorylation and platelet aggregation. IP4 reduced GTPγS-stimulated Rap1-GTP levels and potently reduced extraction of RASA3 and BTK by PIP3 beads. Conclusion ITPK and IP4 are negative regulators of platelet function. IP4 regulation of PH domain-containing proteins may represent a pathway by which platelet activation may be controlled during thrombosis.
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Affiliation(s)
- Kalwant S. Authi
- School of Cardiovascular and Metabolic Medicine and Sciences, BHF Centre for Research Excellence, London, UK
| | - Sabeeya Khan
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Jonathan M. Gibbins
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Susan D. Brain
- School of Cardiovascular and Metabolic Medicine and Sciences, BHF Centre for Research Excellence, London, UK
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18
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Schoen I, Kenny M, Patil S. Platelet mechanosensing as key to understanding platelet function. Curr Opin Hematol 2024; 31:24-31. [PMID: 37846561 DOI: 10.1097/moh.0000000000000788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
PURPOSE OF REVIEW This review highlights how the perception of platelet function is evolving based on recent insights into platelet mechanobiology. RECENT FINDINGS The mechanosensitive ion channel Piezo1 mediates activation of free-flowing platelets under conditions of flow acceleration through mechanisms independent of adhesion receptors and classical activation pathways. Interference with the initiation of platelet migration or with the phenotypic switch of migrating platelets to a procoagulant state aggravates inflammatory bleeding. Mechanosensing of biochemical and biophysical microenvironmental cues during thrombus formation feed into platelet contractile force generation. Measurements of single platelet contraction and bulk clot retraction show promise to identify individuals at risk for hemorrhage. SUMMARY New findings unravel novel mechanotransduction pathways and effector functions in platelets, establishing mechanobiology as a pivotal component of platelet function. These insights highlight limitations of existing treatments and offer new potential therapeutic approaches and diagnostic avenues based on mechanobiological principles. Further extensive research is required to distinguish between core hemostatic and pathological mechanisms influenced by platelet mechanosensing.
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Affiliation(s)
- Ingmar Schoen
- School of Pharmacy and Biomolecular Sciences
- Irish Centre for Vascular Biology
| | - Martin Kenny
- UCD Conway SPHERE Research Group
- School of Biomolecular and Biomedical Science, University College Dublin, Dublin, Ireland
| | - Smita Patil
- School of Pharmacy and Biomolecular Sciences
- Irish Centre for Vascular Biology
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19
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Bruzek S, Betensky M, Di Paola J, Diacovo T, Goldenberg N, Ignjatovic V. What can the plasma proteome tell us about platelets and (vice versa)? Platelets 2023; 34:2186707. [PMID: 36894508 DOI: 10.1080/09537104.2023.2186707] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
Multi-omics approaches are being used increasingly to study physiological and pathophysiologic processes. Proteomics specifically focuses on the study of proteins as functional elements and key contributors to, and markers of the phenotype, as well as targets for diagnostic and therapeutic approaches. Depending on the condition, the plasma proteome can mirror the platelet proteome, and hence play an important role in elucidating both physiologic and pathologic processes. In fact, both plasma and platelet protein signatures have been shown to be important in the setting of thrombosis-prone disease states such as atherosclerosis and cancer. Plasma and platelet proteomes are increasingly being studied as a part of a single entity, as is the case with patient-centric sample collection approaches such as capillary blood. Future studies should cut across the plasma and platelet proteome silos, taking advantage of the vast knowledge available when they are considered as part of the same studies, rather than studied as distinct entities.
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Affiliation(s)
- Steven Bruzek
- Institute for Clinical and Translational Research, Johns Hopkins All Children's Hospital, St. Petersburg, FL, USA
| | - Marisol Betensky
- Institute for Clinical and Translational Research, Johns Hopkins All Children's Hospital, St. Petersburg, FL, USA.,Division of Hematology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Johns Hopkins All Children's Cancer and Blood Disorders Institute, Johns Hopkins All Children's Hospital, St. Petersburg, FL, USA
| | - Jorge Di Paola
- Division of Pediatric Hematology Oncology, Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
| | - Thomas Diacovo
- Departments of Pediatrics and Pharmacology, University of Pittsburgh Medical Center, Children's Hospital of Pittsburgh, Pittsburgh, PA USA
| | - Neil Goldenberg
- Institute for Clinical and Translational Research, Johns Hopkins All Children's Hospital, St. Petersburg, FL, USA.,Department of Pediatrics and Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Vera Ignjatovic
- Institute for Clinical and Translational Research, Johns Hopkins All Children's Hospital, St. Petersburg, FL, USA.,Department of Pediatrics, Johns Hopkins University, Baltimore, USA
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20
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Lee CSM, Kaur A, Montague SJ, Hicks SM, Andrews RK, Gardiner EE. Tissue inhibitors of metalloproteinases (TIMPs) modulate platelet ADAM10 activity. Platelets 2023; 34:2288213. [PMID: 38031964 DOI: 10.1080/09537104.2023.2288213] [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: 08/21/2023] [Accepted: 11/21/2023] [Indexed: 12/01/2023]
Abstract
Platelet-specific collagen receptor glycoprotein (GP)VI is stable on the surface of circulating platelets but undergoes ectodomain cleavage on activated platelets. Activation-dependent GPVI metalloproteolysis is primarily mediated by A Disintegrin And Metalloproteinase (ADAM) 10. Regulation of platelet ADAMs activity is not well-defined however Tissue Inhibitors of Metalloproteinases (TIMPs) may play a role. As levels of TIMPs on platelets and the control of ADAMs-mediated shedding by TIMPs has not been evaluated, we quantified the levels of TIMPs on the surface of resting and activated platelets from healthy donors by flow cytometry and multiplex ELISA. Variable levels of all TIMPs could be detected on platelets. Plasma contained significant quantities of TIMP1 and TIMP2, but only trace amounts of TIMP3 and TIMP4. Recombinant TIMP3 strongly ablated resting and activated platelet ADAM10 activity, when monitored using a quenched fluorogenic peptide substrate with ADAM10 specificity. Whilst ADAM10-specific inhibitor GI254023X or ethylenediamine tetraacetic acid (EDTA) could modulate ligand-initiated shedding of GPVI, only recombinant TIMP2 achieved a modest (~20%) inhibition. We conclude that some platelet TIMPs are able to modulate platelet ADAM10 activity but none strongly regulate ligand-dependent shedding of GPVI. Our findings provide new insights into the regulation of platelet receptor sheddase activity.
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Affiliation(s)
- Christine Shu Mei Lee
- Division of Genome Science and Cancer, John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
| | - Amandeep Kaur
- Division of Genome Science and Cancer, John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
| | - Samantha J Montague
- Division of Genome Science and Cancer, John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
| | - Sarah M Hicks
- Division of Genome Science and Cancer, John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
| | - Robert K Andrews
- Division of Genome Science and Cancer, John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
| | - Elizabeth E Gardiner
- Division of Genome Science and Cancer, John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia
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21
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Singh PK, Dangelmaier CA, Vari HR, Tsygankov AY, Kunapuli SP. Biochemical characterization of spleen tyrosine kinase (SYK) isoforms in platelets. Platelets 2023; 34:2249549. [PMID: 37661351 PMCID: PMC10502920 DOI: 10.1080/09537104.2023.2249549] [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: 06/12/2023] [Revised: 07/12/2023] [Accepted: 08/14/2023] [Indexed: 09/05/2023]
Abstract
Alternate splicing is among the regulatory mechanisms imparting functional diversity in proteins. Studying protein isoforms generated through alternative splicing is therefore critical for understanding protein functions in many biological systems. Spleen tyrosine kinase (Syk) plays an essential role in ITAM/hemITAM signaling in many cell types, including platelets. However, the spectrum of Syk isoforms expressed in platelets has not been characterized. Syk has been shown to have a full-length long isoform SykL and a shorter SykS lacking 23 amino acid residues within its interdomain B. Furthermore, putative isoforms lacking another 23 amino acid-long sequence or a combination of the two deletions have been postulated to exist. In this report, we demonstrate that mouse platelets express full-length SykL and the previously described shorter isoform SykS, but lack other shorter isoforms, whereas human platelets express predominantly SykL. These results both indicate a possible role of alternative Syk splicing in the regulation of receptor signaling in mouse platelets and a difference between signaling regulation in mouse and human platelets.
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Affiliation(s)
- Pankaj Kumar Singh
- Sol Sherry Thrombosis Research Center and Department of Cardiovascular Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Carol A. Dangelmaier
- Sol Sherry Thrombosis Research Center and Department of Cardiovascular Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Hymavathi Reddy Vari
- Sol Sherry Thrombosis Research Center and Department of Cardiovascular Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Alexander Y. Tsygankov
- Sol Sherry Thrombosis Research Center and Department of Cardiovascular Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Satya P. Kunapuli
- Sol Sherry Thrombosis Research Center and Department of Cardiovascular Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
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22
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Biswas R, Boyd EK, Eaton N, Steenackers A, Schulte ML, Reusswig F, Yu H, Drew C, Kahr WHA, Shi Q, Plomann M, Hoffmeister KM, Falet H. PACSIN2 regulates platelet integrin β1 hemostatic function. J Thromb Haemost 2023; 21:3619-3632. [PMID: 37678551 PMCID: PMC10841284 DOI: 10.1016/j.jtha.2023.08.026] [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: 04/25/2023] [Revised: 08/11/2023] [Accepted: 08/25/2023] [Indexed: 09/09/2023]
Abstract
BACKGROUND Upon vessel injury, platelets adhere to exposed matrix constituents via specific membrane receptors, including the von Willebrand factor receptor glycoprotein (GP)Ib-IX-V complex and integrins β1 and β3. In platelets, the Fes/CIP4-homology Bin-Amphiphysin-Rvs protein PACSIN2 associates with the cytoskeletal and scaffolding protein filamin A (FlnA), linking GPIbα and integrins to the cytoskeleton. OBJECTIVES Here we investigated the role of PACSIN2 in platelet function. METHODS Platelet parameters were evaluated in mice lacking PACSIN2 and platelet integrin β1. RESULTS Pacsin2-/- mice displayed mild thrombocytopenia, prolonged bleeding time, and delayed thrombus formation in a ferric chloride-mediated carotid artery injury model, which was normalized by injection of control platelets. Pacsin2-/- platelets formed unstable thrombi that embolized abruptly in a laser-induced cremaster muscle injury model. Pacsin2-/- platelets had hyperactive integrin β1, as evidenced by increased spreading onto surfaces coated with the collagen receptor α2β1-specific peptide GFOGER and increased binding of the antibody 9EG7 directed against active integrin β1. By contrast, Pacsin2-/- platelets had normal integrin αIIbβ3 function and expressed P-selectin normally following stimulation through the collagen receptor GPVI or with thrombin. Deletion of platelet integrin β1 in Pacsin2-/- mice normalized platelet count, hemostasis, and thrombus formation. A PACSIN2 peptide mimicking the FlnA-binding site mediated the pull-down of a FlnA rod 2 construct by integrin β7, a model for integrin β-subunits. CONCLUSIONS Pacsin2-/- mice displayed severe thrombus formation defects due to hyperactive platelet integrin β1. The data suggest that PACSIN2 binding to FlnA negatively regulates platelet integrin β1 hemostatic function.
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Affiliation(s)
- Ratnashree Biswas
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA
| | - Emily K Boyd
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA; Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Nathan Eaton
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA; Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Agata Steenackers
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA
| | | | - Friedrich Reusswig
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA
| | - Hongyin Yu
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Caleb Drew
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA
| | - Walter H A Kahr
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada; Departments of Paediatrics and Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Qizhen Shi
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA; Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin, USA; Children's Research Institute, Children's Wisconsin, Milwaukee, Wisconsin, USA
| | - Markus Plomann
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany
| | - Karin M Hoffmeister
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA; Departments of Biochemistry and Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Hervé Falet
- Versiti Blood Research Institute, Milwaukee, Wisconsin, USA; Translational Glycomics Center, Milwaukee, Wisconsin, USA; Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
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23
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Gupta S, Cooper M, Zhao X, Yarman Y, Thomson H, DeHelian D, Brass LF, Ma P. A regulatory node involving Gα q, PLCβ, and RGS proteins modulates platelet reactivity to critical agonists. J Thromb Haemost 2023; 21:3633-3639. [PMID: 37657560 PMCID: PMC10840692 DOI: 10.1016/j.jtha.2023.08.022] [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: 06/16/2023] [Revised: 08/22/2023] [Accepted: 08/23/2023] [Indexed: 09/03/2023]
Abstract
BACKGROUND Most platelet agonists work through G protein-coupled receptors, activating pathways that involve members of the Gq, Gi, and G12/G13 families of heterotrimeric G proteins. Gq signaling has been shown to be critical for efficient platelet activation. Growing evidence suggests that regulatory mechanisms converge on G protein-coupled receptors and Gq to prevent overly robust platelet reactivity. OBJECTIVES To identify and characterize mechanisms by which Gq signaling is regulated in platelets. METHODS Based on our prior experience with a Gαi2 variant that escapes regulation by regulator of G protein signaling (RGS) proteins, a Gαq variant was designed with glycine 188 replaced with serine (G188S) and then incorporated into a mouse line so that its effects on platelet activation and thrombus formation could be studied in vitro and in vivo. RESULTS AND CONCLUSIONS As predicted, the G188S substitution in Gαq disrupted its interaction with RGS18. Unexpectedly, it also uncoupled PLCβ-3 from activation by platelet agonists as evidenced by a loss rather than a gain of platelet function in vitro and in vivo. Binding studies showed that in addition to preventing the binding of RGS18 to Gαq, the G188S substitution also prevented the binding of PLCβ-3 to Gαq. Structural analysis revealed that G188 resides in the region that is also important for Gαq binding to PLCβ-3 in platelets. We conclude that the Gαq signaling node is more complex than that has been previously understood, suggesting that there is cross-talk between RGS proteins and PLCβ-3 in the context of Gαq signaling.
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Affiliation(s)
- Shuchi Gupta
- Department of Medicine and the Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - Matthew Cooper
- Department of Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Xuefei Zhao
- Department of Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Yanki Yarman
- Department of Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Hannah Thomson
- Department of Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Daniel DeHelian
- Department of Medicine and the Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - Lawrence F Brass
- Department of Medicine and the Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - Peisong Ma
- Department of Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA.
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24
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Mitchell JL, Khan D, Rana RH, Kriek N, Unsworth AJ, Sage T, Bye AP, Laffan M, Shapiro S, Thakurta A, Grech H, Ramasamy K, Gibbins JM. Multiple myeloma and its treatment contribute to increased platelet reactivity. Platelets 2023; 34:2264940. [PMID: 37822056 DOI: 10.1080/09537104.2023.2264940] [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: 07/24/2023] [Accepted: 09/25/2023] [Indexed: 10/13/2023]
Abstract
Multiple myeloma (MM) and its precursor states, smoldering myeloma (SM) and monoclonal gammopathy of undetermined significance (MGUS) are associated with increased incidence of thrombosis, however the cause of this is unknown. Lenalidomide treatment of MM substantially improves patient survival, although significantly increases thrombotic risk by an unknown mechanism. This pilot study aimed to establish the impact of MM and its treatment with Lenalidomide on platelet function. We analyzed platelet function in MGUS, SM and MM compared to healthy controls. We report an increase in platelet reactivity in MGUS, SM, and MM where increases in fibrinogen binding, P-selectin exposure, altered receptor expression, elevated levels of aggregation and enhanced sensitivity to agonist stimulation were observed. We also demonstrate an increase in patient platelet reactivity post Lenalidomide treatment compared to pre-treatment. We show Lenalidomide treatment of platelets ex vivo increased reactivity that was associated with formation of larger thrombi at arterial shear rates but not venous shear rates. This study demonstrates a clear increase in platelet reactivity and prothrombotic potential in patients with MGUS, SM and MM which is elevated further upon treatment with Lenalidomide. Our observations suggest that more detailed studies are warranted to determine mechanisms of thrombotic complications to enable the development of new preventative strategies that specifically target platelets.
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Affiliation(s)
- Joanne L Mitchell
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
- Institute for Cardiovascular Research, University of Birmingham, Birmingham, UK
| | - Dalia Khan
- Blood Theme Oxford Biomedical Research Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Rekha H Rana
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Neline Kriek
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Amanda J Unsworth
- Department of Life Sciences, Manchester Metropolitan University, Manchester, UK
| | - Tanya Sage
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Alexander P Bye
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Michael Laffan
- Centre for Haematology, Department of Medicine, Imperial College London, London, UK
| | - Susan Shapiro
- Blood Theme Oxford Biomedical Research Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
- Radcliffe Department of Medicine, Oxford University, Oxford, UK
| | - Anjan Thakurta
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK
| | - Henri Grech
- Department of Haematology, Royal Berkshire Hospitals NHS Foundation Trust, Reading, UK
| | - Karthik Ramasamy
- Blood Theme Oxford Biomedical Research Centre, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - Jonathan M Gibbins
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
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25
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Schwertz H, Middleton EA. Autophagy and its consequences for platelet biology. Thromb Res 2023; 231:170-181. [PMID: 36058760 PMCID: PMC10286736 DOI: 10.1016/j.thromres.2022.08.019] [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: 05/17/2022] [Revised: 07/26/2022] [Accepted: 08/19/2022] [Indexed: 01/18/2023]
Abstract
Autophagy, the continuous recycling of intracellular building blocks, molecules, and organelles is necessary to preserve cellular function and homeostasis. In this context, it was demonstrated that autophagy plays an important role in megakaryopoiesis, the development and differentiation of hematopoietic progenitor cells into megakaryocytes. Furthermore, in recent years, autophagic proteins were detected in platelets, anucleate cells generated by megakaryocytes, responsible for hemostasis, thrombosis, and a key cell in inflammation and host immune responses. In the last decade studies have indicated the occurrence of autophagy in platelets. Moreover, autophagy in platelets was subsequently demonstrated to be involved in platelet aggregation, adhesion, and thrombus formation. Here, we review the current knowledge about autophagy in platelets, its function, and clinical implications. However, at the advent of platelet autophagy research, additional discoveries derived from evolving work will be required to precisely define the contributions of autophagy in platelets, and to expand the ever increasing physiologic and pathologic roles these remarkable and versatile blood cells play.
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Affiliation(s)
- Hansjörg Schwertz
- Molecular Medicine Program, University of Utah, Salt Lake City, UT 84112, USA; Division of Occupational Medicine, University of Utah, Salt Lake City, UT 84112, USA; Department of Occupational Medicine, Billings Clinic Bozeman, Bozeman, MT 59718, USA.
| | - Elizabeth A Middleton
- Molecular Medicine Program, University of Utah, Salt Lake City, UT 84112, USA; Division of Pulmonary Medicine and Critical Care, University of Utah, Salt Lake City, UT 84112, USA
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26
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Josefsson EC. Platelet intrinsic apoptosis. Thromb Res 2023; 231:206-213. [PMID: 36739256 DOI: 10.1016/j.thromres.2022.11.024] [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: 08/23/2022] [Revised: 10/31/2022] [Accepted: 11/28/2022] [Indexed: 12/14/2022]
Abstract
In a healthy individual, the lifespan of most platelets is tightly regulated by intrinsic, or mitochondrial, apoptosis. This is a special form of programmed cell death governed by the BCL-2 family of proteins, where the prosurvival protein BCL-XL maintains platelet viability by restraining the prodeath proteins BAK and BAX. Restriction of platelet lifespan by activation of BAK and BAX mediated intrinsic apoptosis is essential to maintain a functional, haemostatically reactive platelet population. This review focuses on the molecular regulation of intrinsic apoptosis in platelets, reviews conditions linked to enhanced platelet death, discusses ex vivo storage of platelets and describes caveats associated with the assessment of platelet apoptosis.
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Affiliation(s)
- Emma C Josefsson
- Sahlgrenska University Hospital, Department of Clinical Chemistry, Gothenburg, Sweden; The University of Gothenburg, Department of Laboratory Medicine, Institute of Biomedicine, Gothenburg, Sweden; The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, VIC 3052, Australia; The University of Melbourne, Department of Medical Biology, 1G Royal Parade, VIC 3052, Australia.
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27
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Leberzammer J, von Hundelshausen P. Chemokines, molecular drivers of thromboinflammation and immunothrombosis. Front Immunol 2023; 14:1276353. [PMID: 37954596 PMCID: PMC10637585 DOI: 10.3389/fimmu.2023.1276353] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 10/12/2023] [Indexed: 11/14/2023] Open
Abstract
Blood clotting is a finely regulated process that is essential for hemostasis. However, when dysregulated or spontaneous, it promotes thrombotic disorders. The fact that these are triggered, accompanied and amplified by inflammation is reflected in the term thromboinflammation that includes chemokines. The role of chemokines in thrombosis is therefore illuminated from a cellular perspective, where endothelial cells, platelets, red blood cells, and leukocytes may be both the source and target of chemokines. Chemokine-dependent prothrombotic processes may thereby occur independently of chemokine receptors or be mediated by chemokine receptors, although the binding and activation of classical G protein-coupled receptors and their signaling pathways differ from those of atypical chemokine receptors, which do not function via cell activation and recruitment. Regardless of binding to their receptors, chemokines can induce thrombosis by forming platelet-activating immune complexes with heparin or other polyanions that are pathognomonic for HIT and VITT. In addition, chemokines can bind to NETs and alter their structure. They also change the electrical charge of the cell surface of platelets and interact with coagulation factors, thereby modulating the balance of fibrinolysis and coagulation. Moreover, CXCL12 activates CXCR4 on platelets independently of classical migratory chemokine activity and causes aggregation and thrombosis via the PI3Kβ and Btk signaling pathways. In contrast, typical chemokine-chemokine receptor interactions are involved in the processes that contribute to the adhesiveness of the endothelium in the initial phase of venous thrombosis, where neutrophils and monocytes subsequently accumulate in massive numbers. Later, the reorganization and resolution of a thrombus require coordinated cell migration and invasion of the thrombus, and, as such, indeed, chemokines recruit leukocytes to existing thrombi. Therefore, chemokines contribute in many independent ways to thrombosis.
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Affiliation(s)
- Julian Leberzammer
- Institute of Cardiovascular Regeneration, Goethe University Frankfurt, Frankfurt, Germany
- Department of Cardiology and Angiology, Goethe University Frankfurt, University Hospital, Frankfurt, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Philipp von Hundelshausen
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
- Institute for Cardiovascular Prevention, Institut für Prophylaxe und Epidemiologie der Kreislaufkrankheiten (IPEK), Ludwig-Maximilians-Universität München, Munich, Germany
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28
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Khatlani T, Pradhan S, Langlois K, Subramanyam D, Rumbaut RE, Vijayan KV. Opposing Roles for the α Isoform of the Catalytic Subunit of Protein Phosphatase 1 in Inside-Out and Outside-In Integrin Signaling in Murine Platelets. Cells 2023; 12:2424. [PMID: 37887268 PMCID: PMC10605409 DOI: 10.3390/cells12202424] [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: 09/07/2023] [Revised: 10/04/2023] [Accepted: 10/06/2023] [Indexed: 10/28/2023] Open
Abstract
Platelet activation during hemostasis and thrombosis is facilitated by agonist-induced inside-out and integrin αIIbβ3-initiated outside-in signaling via protein kinases and phosphatases. Pharmacological inhibitor studies suggest that the serine/threonine protein phosphatase 1 (PP1) promotes platelet activation. However, since phosphatase inhibitors block all the isoforms of the catalytic subunit of PP1 (PP1c), the role of specific PP1c isoform in platelet signaling remains unclear. Here, we employed a platelet-specific PP1cα-/- mice to explore the contribution of a major PP1 isoform in platelet functions. Loss of PP1cα moderately decreased activation of integrin αIIbβ3, binding of soluble fibrinogen, and aggregation to low-dose thrombin, ADP, and collagen. In contrast, PP1cα-/- platelets displayed increased adhesion to immobilized fibrinogen, fibrin clot retraction, and thrombus formation on immobilized collagen. Mechanistically, post-fibrinogen engagement potentiated p38 mitogen-activated protein kinase (MAPK) activation in PP1cα-/- platelets and the p38 inhibitor blocked the increased integrin-mediated outside-in signaling function. Tail bleeding time and light-dye injury-induced microvascular thrombosis in the cremaster venules and arterioles were not altered in PP1cα-/- mice. Thus, PP1cα displays pleiotropic signaling in platelets as it amplifies agonist-induced signaling and attenuates integrin-mediated signaling with no impact on hemostasis and thrombosis.
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Affiliation(s)
- Tanvir Khatlani
- Cardiovascular Research Section, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey Veterans Affairs Medical Center (MEDVAMC), Houston, TX 77030, USA
| | - Subhashree Pradhan
- Cardiovascular Research Section, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey Veterans Affairs Medical Center (MEDVAMC), Houston, TX 77030, USA
| | - Kimberly Langlois
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey Veterans Affairs Medical Center (MEDVAMC), Houston, TX 77030, USA
- Pulmonary Section, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - Deepika Subramanyam
- Cardiovascular Research Section, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey Veterans Affairs Medical Center (MEDVAMC), Houston, TX 77030, USA
| | - Rolando E. Rumbaut
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey Veterans Affairs Medical Center (MEDVAMC), Houston, TX 77030, USA
- Pulmonary Section, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - K. Vinod Vijayan
- Cardiovascular Research Section, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey Veterans Affairs Medical Center (MEDVAMC), Houston, TX 77030, USA
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29
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Mobbs JI, Black KA, Tran M, Burger WAC, Venugopal H, Holman TR, Holinstat M, Thal DM, Glukhova A. Cryo-EM structures of human arachidonate 12S-lipoxygenase bound to endogenous and exogenous inhibitors. Blood 2023; 142:1233-1242. [PMID: 37506345 PMCID: PMC10579047 DOI: 10.1182/blood.2023020441] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 07/05/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme.
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Affiliation(s)
- Jesse I. Mobbs
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
- ARC Centre for Cryo-Electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
| | - Katrina A. Black
- Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, VIC, Australia
- Department of Biochemistry and Pharmacology, University of Melbourne, Melbourne, VIC, Australia
| | - Michelle Tran
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA
| | - Wessel A. C. Burger
- ARC Centre for Cryo-Electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
- Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, VIC, Australia
- Department of Biochemistry and Pharmacology, University of Melbourne, Melbourne, VIC, Australia
| | - Hariprasad Venugopal
- Ramaciotti Centre for Cryo-Electron Microscopy, Monash University, Clayton, VIC, Australia
| | - Theodore R. Holman
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA
| | - Michael Holinstat
- Department of Pharmacology, University of Michigan, Ann Arbor, MI
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, MI
| | - David M. Thal
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
- ARC Centre for Cryo-Electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
| | - Alisa Glukhova
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
- ARC Centre for Cryo-Electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
- Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, VIC, Australia
- Department of Biochemistry and Pharmacology, University of Melbourne, Melbourne, VIC, Australia
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30
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Agbani EO, Young D, Chen SA, Smith S, Lee A, Poole AW, Dufour A, Poon MC. Membrane procoagulation and N‑terminomics/TAILS profiling in Montreal platelet syndrome kindred with VWF p.V1316M mutation. COMMUNICATIONS MEDICINE 2023; 3:125. [PMID: 37735203 PMCID: PMC10514327 DOI: 10.1038/s43856-023-00354-1] [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: 10/11/2022] [Accepted: 09/06/2023] [Indexed: 09/23/2023] Open
Abstract
BACKGROUND The Montreal platelet syndrome kindred (MPS) with VWF p.V1316M mutation (2B-VWDMPS) is an extremely rare disorder. It has been associated with macrothrombocytopenia, spontaneous platelet clumping, mucocutaneous, and other bleeding, which can be largely prevented by von Willebrand factor (VWF) concentrate infusion. However, supplemental platelet transfusion has been required on occasion, particularly for severe gastrointestinal bleeds. This raised the question of whether a previously uncharacterized platelet dysfunction contributes to bleeding diathesis in 2B-VWDMPS patients. We have previously shown that membrane ballooning, a principal part of the platelet procoagulant membrane dynamics (PMD) after collagen stimulation, is driven by the influx of Na+ and Cl-, followed by the entry of water. METHODS We study two members (mother and daughter) of the MPS kindred with severe bleeding phenotype and address this question by coupling quantitative platelet shotgun proteomics and validating biochemical assays, with the systematic analysis of platelet procoagulant membrane dynamics (PMD). Using N-terminomics/TAILS (terminal amine isotopic labeling of substrates), we compare changes in proteolysis between healthy and 2B-VWDMPS platelets. RESULTS Here, we report in 2B-VWDMPS platelets, the loss of the transmembrane chloride channel-1 (CLIC1), and reduced chloride ion influx after collagen stimulation. This was associated with diminished membrane ballooning, phosphatidylserine externalization, and membrane thrombin formation, as well as a distinct phenotypic composition of platelets over fibrillar collagen. We also identify processing differences of VWF, fibronectin (FN1), and Crk-like protein (CRKL). 2B-VWDMPS platelets are shown to be basally activated, partially degranulated, and have marked loss of regulatory, cytoskeletal, and contractile proteins. CONCLUSIONS This may account for structural disorganization, giant platelet formation, and a weakened hemostatic response.
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Affiliation(s)
- Ejaife O Agbani
- Department of Physiology & Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
- Libin Cardiovascular Institute, University of Calgary, Calgary, AB, Canada.
| | - Daniel Young
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
| | - Si An Chen
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
| | - Sophie Smith
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
| | - Adrienne Lee
- Division of Hematology, Department of Medicine/Medical Oncology, University of British Columbia, Island Health, Victoria, BC, Canada
| | - Alastair W Poole
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, England, UK
| | - Antoine Dufour
- Department of Physiology & Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada.
| | - Man-Chiu Poon
- Division of Hematology & Hematological Malignancies, Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
- Departments of Pediatrics and Oncology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
- Arnie Charbonneau Cancer Institute, University of Calgary, Calgary, AB, Canada.
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31
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Thom CS, Davenport P, Fazelinia H, Liu ZJ, Zhang H, Ding H, Roof J, Spruce LA, Ischiropoulos H, Sola-Visner M. Phosphoproteomics reveals content and signaling differences between neonatal and adult platelets. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.13.557268. [PMID: 37745418 PMCID: PMC10515911 DOI: 10.1101/2023.09.13.557268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Background and Objective Recent clinical studies have shown that transfusions of adult platelets increase morbidity and mortality in preterm infants. Neonatal platelets are hyporesponsive to agonist stimulation, and emerging evidence suggests developmental differences in platelet immune functions. This study was designed to compare the proteome and phosphoproteome of resting adult and neonatal platelets. Methods We isolated resting umbilical cord blood-derived platelets from healthy full term neonates (n=9) and resting blood platelets from healthy adults (n=7), and compared protein and phosphoprotein contents using data independent acquisition mass spectrometry. Results We identified 4745 platelet proteins with high confidence across all samples. Adult and neonatal platelets clustered separately by principal component analysis. Adult platelets were significantly enriched for immunomodulatory proteins, including β2 microglobulin and CXCL12, whereas neonatal platelets were enriched for ribosomal components and proteins involved in metabolic activities. Adult platelets were enriched for phosphorylated GTPase regulatory enzymes and proteins participating in trafficking, which may help prime them for activation and degranulation. Neonatal platelets were enriched for phosphorylated proteins involved in insulin growth factor signaling. Conclusions Using state-of-the-art mass spectrometry, our findings expanded the known neonatal platelet proteome and identified important differences in protein content and phosphorylation compared with adult platelets. These developmental differences suggested enhanced immune functions for adult platelets and presence of a molecular machinery related to platelet activation. These findings are important to understanding mechanisms underlying key platelet functions as well as the harmful effects of adult platelet transfusions given to preterm infants.
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Affiliation(s)
- Christopher S Thom
- Division of Neonatology, Children’s Hospital of Philadelphia, Philadelphia, PA, USA
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Patricia Davenport
- Division of Newborn Medicine, Boston Children's Hospital, Boston, MA, USA
| | - Hossein Fazelinia
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Zhi-Jian Liu
- Division of Newborn Medicine, Boston Children's Hospital, Boston, MA, USA
| | - Haorui Zhang
- Division of Newborn Medicine, Boston Children's Hospital, Boston, MA, USA
| | - Hua Ding
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Jennifer Roof
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Lynn A Spruce
- Proteomics Core, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Harry Ischiropoulos
- Division of Neonatology, Children’s Hospital of Philadelphia, Philadelphia, PA, USA
- Children's Hospital of Philadelphia Research Institute, Philadelphia, PA
| | - Martha Sola-Visner
- Division of Newborn Medicine, Boston Children's Hospital, Boston, MA, USA
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32
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Evtugina NG, Peshkova AD, Khabirova AI, Andrianova IA, Abdullayeva S, Ayombil F, Shepeliuk T, Grishchuk EL, Ataullakhanov FI, Litvinov RI, Weisel JW. Activation of Piezo1 channels in compressed red blood cells augments platelet-driven contraction of blood clots. J Thromb Haemost 2023; 21:2418-2429. [PMID: 37268065 PMCID: PMC10949619 DOI: 10.1016/j.jtha.2023.05.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 05/24/2023] [Accepted: 05/25/2023] [Indexed: 06/04/2023]
Abstract
BACKGROUND Piezo1 is a mechanosensitive cationic channel that boosts intracellular [Ca2+]i. Compression of red blood cells (RBCs) during platelet-driven contraction of blood clots may cause the activation of Piezo1. OBJECTIVES To establish relationships between Piezo1 activity and blood clot contraction. METHODS Effects of a Piezo1 agonist, Yoda1, and antagonist, GsMTx-4, on clot contraction in vitro were studied in human blood containing physiological [Ca2+]. Clot contraction was induced by exogenous thrombin. Activation of Piezo1 was assessed by Ca2+ influx in RBCs and with other functional and morphologic features. RESULTS Piezo1 channels in compressed RBCs are activated naturally during blood clot contraction and induce an upsurge in the intracellular [Ca2+]i, followed by phosphatidylserine exposure. Adding the Piezo1 agonist Yoda1 to whole blood increased the extent of clot contraction due to Ca2+-dependent volumetric shrinkage of RBCs and increased platelet contractility due to their hyperactivation by the enhanced generation of endogenous thrombin on activated RBCs. Addition of rivaroxaban, the inhibitor of thrombin formation, or elimination of Ca2+ from the extracellular space abrogated the stimulating effect of Yoda1 on clot contraction. The Piezo1 antagonist, GsMTx-4, caused a decrease in the extent of clot contraction relative to the control both in whole blood and in platelet-rich plasma. Activated Piezo1 in compressed and deformed RBCs amplified the platelet contractility as a positive feedback mechanism during clot contraction. CONCLUSION The results obtained demonstrate that the Piezo1 channel expressed on RBCs comprises a mechanochemical modulator of blood clotting that may be considered a potential therapeutic target to correct hemostatic disorders.
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Affiliation(s)
- Natalia G Evtugina
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Republic of Tatarstan, Russian Federation
| | - Alina D Peshkova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Republic of Tatarstan, Russian Federation; Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
| | - Alina I Khabirova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Republic of Tatarstan, Russian Federation
| | - Izabella A Andrianova
- Department of Internal Medicine, Division of Hematology and Program in Molecular Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Shahnoza Abdullayeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Republic of Tatarstan, Russian Federation
| | - Francis Ayombil
- Division of Hematology and the Raymond G. Perelman Center for Cellular and Molecular Therapeutics, the Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Taisia Shepeliuk
- Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
| | - Ekaterina L Grishchuk
- Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
| | - Fazoil I Ataullakhanov
- Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
| | - Rustem I Litvinov
- Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
| | - John W Weisel
- Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA.
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33
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Wang L, Liu Y, Tian R, Zuo W, Qian H, Wang L, Yang X, Liu Z, Zhang S. What do we know about platelets in myocardial ischemia-reperfusion injury and why is it important? Thromb Res 2023; 229:114-126. [PMID: 37437517 DOI: 10.1016/j.thromres.2023.06.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 05/22/2023] [Accepted: 06/23/2023] [Indexed: 07/14/2023]
Abstract
Myocardial ischemia-reperfusion injury (MIRI), the joint result of ischemic injury and reperfusion injury, is associated with poor outcomes in patients with acute myocardial infarction undergoing primary percutaneous coronary intervention. Accumulating evidence demonstrates that activated platelets directly contribute to the pathogenesis of MIRI through participating in the formation of microthrombi, interaction with leukocytes, secretion of active substances, constriction of microvasculature, and activation of spinal afferent nerves. The molecular mechanisms underlying the above detrimental effects of activated platelets include the homotypic and heterotypic interactions through surface receptors, transduction of intracellular signals, and secretion of active substances. Revealing the roles of platelet activation in MIRI and the associated mechanisms would provide potential targets/strategies for the clinical evaluation and treatment of MIRI. Further studies are needed to characterize the temporal (ischemia phase vs. reperfusion phase) and spatial (systemic vs. local) distributions of platelet activation in MIRI by multi-omics strategies. To improve the likelihood of translating novel cardioprotective interventions into clinical practice, basic researches maximally replicating the complexity of clinical scenarios would be necessary.
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Affiliation(s)
- Lun Wang
- Department of Internal Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China
| | - Yifan Liu
- Department of Internal Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China
| | - Ran Tian
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China
| | - Wei Zuo
- Department of Pharmacy, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China
| | - Hao Qian
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China
| | - Liang Wang
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China
| | - Xinglin Yang
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China
| | - Zhenyu Liu
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China.
| | - Shuyang Zhang
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China.
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Guinard I, Nguyen T, Brassard-Jollive N, Weber J, Ruch L, Reininger L, Brouard N, Eckly A, Collin D, Lanza F, Léon C. Matrix stiffness controls megakaryocyte adhesion, fibronectin fibrillogenesis, and proplatelet formation through Itgβ3. Blood Adv 2023; 7:4003-4018. [PMID: 37171626 PMCID: PMC10410137 DOI: 10.1182/bloodadvances.2022008680] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 04/13/2023] [Accepted: 04/17/2023] [Indexed: 05/13/2023] Open
Abstract
Megakaryocytes (MKs) are the precursor cells of platelets, located in the bone marrow (BM). Once mature, they extend elongated projections named proplatelets through sinusoid vessels, emerging from the marrow stroma into the circulating blood. Not all signals from the microenvironment that regulate proplatelet formation are understood, particularly those from the BM biomechanics. We sought to investigate how MKs perceive and adapt to modifications of the stiffness of their environment. Although the BM is one of the softest tissue of the body, its rigidification results from excess fibronectin (FN), and other matrix protein deposition occur upon myelofibrosis. Here, we have shown that mouse MKs are able to detect the stiffness of a FN-coated substrate and adapt their morphology accordingly. Using a polydimethylsiloxane substrate with stiffness varying from physiological to pathological marrow, we found that a stiff matrix favors spreading, intracellular contractility, and FN fibrils assembly at the expense of proplatelet formation. Itgb3, but not Itgb1, is required for stiffness sensing, whereas both integrins are involved in fibrils assembly. In contrast, soft substrates promote proplatelet formation in an Itgb3-dependent manner, consistent with the ex vivo decrease in proplatelet formation and the in vivo decrease in platelet number in Itgb3-deficient mice. Our findings demonstrate the importance of environmental stiffness for MK functions with potential pathophysiological implications during pathologies that deregulate FN deposition and modulate stiffness in the marrow.
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Affiliation(s)
- Ines Guinard
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Thao Nguyen
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Noémie Brassard-Jollive
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Josiane Weber
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Laurie Ruch
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Laura Reininger
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Nathalie Brouard
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Anita Eckly
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | | | - François Lanza
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Catherine Léon
- UMR_S1255, INSERM, Etablissement Français du Sang-Grand Est, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
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35
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O'Donoghue L, Comer SP, Hiebner DW, Schoen I, von Kriegsheim A, Smolenski A. RhoGAP6 interacts with COPI to regulate protein transport. Biochem J 2023; 480:1109-1127. [PMID: 37409526 DOI: 10.1042/bcj20230013] [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: 01/16/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 07/07/2023]
Abstract
RhoGAP6 is the most highly expressed GTPase-activating protein (GAP) in platelets specific for RhoA. Structurally RhoGAP6 contains a central catalytic GAP domain surrounded by large, disordered N- and C-termini of unknown function. Sequence analysis revealed three conserved consecutive overlapping di-tryptophan motifs close to the RhoGAP6 C-terminus which were predicted to bind to the mu homology domain (MHD) of δ-COP, a component of the COPI vesicle complex. We confirmed an endogenous interaction between RhoGAP6 and δ-COP in human platelets using GST-CD2AP which binds an N-terminal RhoGAP6 SH3 binding motif. Next, we confirmed that the MHD of δ-COP and the di-tryptophan motifs of RhoGAP6 mediate the interaction between both proteins. Each of the three di-tryptophan motifs appeared necessary for stable δ-COP binding. Proteomic analysis of other potential RhoGAP6 di-tryptophan motif binding partners indicated that the RhoGAP6/δ-COP interaction connects RhoGAP6 to the whole COPI complex. 14-3-3 was also established as a RhoGAP6 binding partner and its binding site was mapped to serine 37. We provide evidence of potential cross-regulation between 14-3-3 and δ-COP binding, however, neither δ-COP nor 14-3-3 binding to RhoGAP6 impacted RhoA activity. Instead, analysis of protein transport through the secretory pathway demonstrated that RhoGAP6/δ-COP binding increased protein transport to the plasma membrane, as did a catalytically inactive mutant of RhoGAP6. Overall, we have identified a novel interaction between RhoGAP6 and δ-COP which is mediated by conserved C-terminal di-tryptophan motifs, and which might control protein transport in platelets.
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Affiliation(s)
- Lorna O'Donoghue
- UCD School of Medicine, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield Dublin 4, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, 123 St Stephen's Green, Dublin D02 YN77, Ireland
| | - Shane P Comer
- UCD School of Medicine, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield Dublin 4, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, 123 St Stephen's Green, Dublin D02 YN77, Ireland
| | - Dishon W Hiebner
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, 123 St Stephen's Green, Dublin D02 YN77, Ireland
- UCD School of Chemical & Bioprocess Engineering, Engineering & Materials Science Centre, University College Dublin, Belfield Dublin 4, Ireland
| | - Ingmar Schoen
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, 123 St Stephen's Green, Dublin D02 YN77, Ireland
- School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland (RCSI), 123 St Stephen's Green, Dublin D02 YN77, Ireland
| | - Alex von Kriegsheim
- Edinburgh Cancer Research UK Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Crewe Road South, Edinburgh EH4 2XR, U.K
| | - Albert Smolenski
- UCD School of Medicine, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield Dublin 4, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, 123 St Stephen's Green, Dublin D02 YN77, Ireland
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Kuravi SJ, Ahmed NS, Taylor KA, Capes EM, Bye A, Unsworth AJ, Gibbins JM, Pugh N. Delineating Zinc Influx Mechanisms during Platelet Activation. Int J Mol Sci 2023; 24:11689. [PMID: 37511448 PMCID: PMC10380784 DOI: 10.3390/ijms241411689] [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: 05/08/2023] [Revised: 07/07/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023] Open
Abstract
Zinc (Zn2+) is released by platelets during a hemostatic response to injury. Extracellular zinc ([Zn2+]o) initiates platelet activation following influx into the platelet cytosol. However, the mechanisms that permit Zn2+ influx are unknown. Fluctuations in intracellular zinc ([Zn2+]i) were measured in fluozin-3-loaded platelets using fluorometry and flow cytometry. Platelet activation was assessed using light transmission aggregometry. The detection of phosphoproteins was performed by Western blotting. [Zn2+]o influx and subsequent platelet activation were abrogated by blocking the sodium/calcium exchanged, TRP channels, and ZIP7. Cation store depletion regulated Zn2+ influx. [Zn2+]o stimulation resulted in the phosphorylation of PKC substates, MLC, and β3 integrin. Platelet activation via GPVI or Zn2+ resulted in ZIP7 phosphorylation in a casein kinase 2-dependent manner and initiated elevations of [Zn2+]i that were sensitive to the inhibition of Orai1, ZIP7, or IP3R-mediated pathways. These data indicate that platelets detect and respond to changes in [Zn2+]o via influx into the cytosol through TRP channels and the NCX exchanger. Platelet activation results in the externalization of ZIP7, which further regulates Zn2+ influx. Increases in [Zn2+]i contribute to the activation of cation-dependent enzymes. Sensitivity of Zn2+ influx to thapsigargin indicates a store-operated pathway that we term store-operated Zn2+ entry (SOZE). These mechanisms may affect platelet behavior during thrombosis and hemostasis.
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Affiliation(s)
- Sahithi J. Kuravi
- School of Life Sciences, Anglia Ruskin University, Cambridge CB1 1PT, UK (E.M.C.)
| | - Niaz S. Ahmed
- School of Life Sciences, Anglia Ruskin University, Cambridge CB1 1PT, UK (E.M.C.)
| | - Kirk A. Taylor
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading RG6 6EX, UK (J.M.G.)
| | - Emily M. Capes
- School of Life Sciences, Anglia Ruskin University, Cambridge CB1 1PT, UK (E.M.C.)
| | - Alex Bye
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading RG6 6EX, UK (J.M.G.)
| | - Amanda J. Unsworth
- Department of Life Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester M1 5GD, UK
| | - Jonathan M. Gibbins
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading RG6 6EX, UK (J.M.G.)
| | - Nicholas Pugh
- School of Life Sciences, Anglia Ruskin University, Cambridge CB1 1PT, UK (E.M.C.)
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37
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Goldschmied A, Drotleff B, Winter S, Schaeffeler E, Schwab M, Gawaz M, Geisler T, Rath D. Platelet miRNAs: differential expression in coronary artery disease and associations with course of left ventricular systolic function. BMC Cardiovasc Disord 2023; 23:348. [PMID: 37438691 DOI: 10.1186/s12872-023-03362-0] [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: 01/05/2023] [Accepted: 06/21/2023] [Indexed: 07/14/2023] Open
Abstract
BACKGROUND MicroRNAs are paramount in post transcriptional gene regulation. We investigated platelet miRNAs in patients with CAD and examined potential associations with course of left ventricular ejection fraction (LVEF%). MATERIALS AND METHODS In a first cohort, 62 MiRNAs were measured in platelets of 100 patients suffering from CAD. Expression profiles of individuals with chronic coronary syndrome (CCS) and MI were compared (CCS n = 67, MI n = 33). Also, associations between miRNA profiles and change in left ventricular ejection fraction (LVEF%) were investigated. In a second cohort of patients suffering from CCS (n = 10), MI (n = 11) or no CAD (n = 13), we measured miRNA expression in platelets, platelet supernatant and serum. This was carried out before and after in vitro platelet activation with CRP. RESULTS Platelet miRNAs 103a-3p and 155-5p demonstrated higher expression in patients with CCS then in individuals with MI. Furthermore, multiple miRNAs were significantly higher expressed in matched controls compared to MI patients. 8 miRNAs showed higher expression in patients with improving LVEF% after a 1-year follow-up. In our second cohort, we found higher concentrations of 6 miRNAs in the platelet supernatant of patients with CCS, MI and no CAD after in vitro platelet activation. Most of these miRNAs showed a higher abundance in serum of MI patients as compared to CCS. CONCLUSION Several miRNAs show higher expression in platelets of CCS compared to MI. After in vitro platelet activation, a release of multiple miRNAs out of the thrombocyte was observed. Furthermore, upregulation of serum miRNAs was found in MI patients when compared to CCS patients and individuals without CAD. Hence, platelets could present a source of upregulated circulating miRNAs in MI and additionally affect course of LVEF%.
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Affiliation(s)
- Andreas Goldschmied
- Department of Cardiology, University Hospital Tübingen, Otfried-Müller Str. 10, 72076, Tübingen, Germany
| | | | - Stefan Winter
- University of Tübingen, Tübingen, Germany
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, Germany
| | - Elke Schaeffeler
- University of Tübingen, Tübingen, Germany
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, Germany
| | - Matthias Schwab
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, Germany
- Departments of Clinical Pharmacology, Pharmacy and Biochemistry, University of Tübingen, Tübingen, Germany
| | - Meinrad Gawaz
- Department of Cardiology, University Hospital Tübingen, Otfried-Müller Str. 10, 72076, Tübingen, Germany
| | - Tobias Geisler
- Department of Cardiology, University Hospital Tübingen, Otfried-Müller Str. 10, 72076, Tübingen, Germany.
| | - Dominik Rath
- Department of Cardiology, University Hospital Tübingen, Otfried-Müller Str. 10, 72076, Tübingen, Germany
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38
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Ravera S, Signorello MG, Panfoli I. Platelet Metabolic Flexibility: A Matter of Substrate and Location. Cells 2023; 12:1802. [PMID: 37443836 PMCID: PMC10340290 DOI: 10.3390/cells12131802] [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: 05/17/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023] Open
Abstract
Platelets are cellular elements that are physiologically involved in hemostasis, inflammation, thrombotic events, and various human diseases. There is a link between the activation of platelets and their metabolism. Platelets possess considerable metabolic versatility. Although the role of platelets in hemostasis and inflammation is known, our current understanding of platelet metabolism in terms of substrate preference is limited. Platelet activation triggers an oxidative metabolism increase to sustain energy requirements better than aerobic glycolysis alone. In addition, platelets possess extra-mitochondrial oxidative phosphorylation, which could be one of the sources of chemical energy required for platelet activation. This review aims to provide an overview of flexible platelet metabolism, focusing on the role of metabolic compartmentalization in substrate preference, since the metabolic flexibility of stimulated platelets could depend on subcellular localization and functional timing. Thus, developing a detailed understanding of the link between platelet activation and metabolic changes is crucial for improving human health.
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Affiliation(s)
- Silvia Ravera
- Department of Experimental Medicine, University of Genoa, 16132 Genoa, Italy;
| | | | - Isabella Panfoli
- Department of Pharmacy (DIFAR), University of Genoa, 16132 Genoa, Italy;
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de Sousa DMB, Poupardin R, Villeda SA, Schroer AB, Fröhlich T, Frey V, Staffen W, Mrowetz H, Altendorfer B, Unger MS, Iglseder B, Paulweber B, Trinka E, Cadamuro J, Drerup M, Schallmoser K, Aigner L, Kniewallner KM. The platelet transcriptome and proteome in Alzheimer's disease and aging: an exploratory cross-sectional study. Front Mol Biosci 2023; 10:1196083. [PMID: 37457829 PMCID: PMC10348715 DOI: 10.3389/fmolb.2023.1196083] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/05/2023] [Indexed: 07/18/2023] Open
Abstract
Introduction: Alzheimer's disease (AD) and aging are associated with platelet hyperactivity. However, the mechanisms underlying abnormal platelet function in AD and aging are yet poorly understood. Methods: To explore the molecular profile of AD and aged platelets, we investigated platelet activation (i.e., CD62P expression), proteome and transcriptome in AD patients, non-demented elderly, and young individuals as controls. Results: AD, aged and young individuals showed similar levels of platelet activation based on CD62P expression. However, AD and aged individuals had a proteomic signature suggestive of increased platelet activation compared with young controls. Transcriptomic profiling suggested the dysregulation of proteolytic machinery involved in regulating platelet function, particularly the ubiquitin-proteasome system in AD and autophagy in aging. The functional implication of these transcriptomic alterations remains unclear and requires further investigation. Discussion: Our data strengthen the evidence of enhanced platelet activation in aging and provide a first glimpse of the platelet transcriptomic changes occurring in AD.
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Affiliation(s)
- Diana M. Bessa de Sousa
- Institute of Molecular Regenerative Medicine, Paracelsus Medical University, Salzburg, Austria
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
| | - Rodolphe Poupardin
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
- Experimental and Clinical Cell Therapy Institute, Paracelsus Medical University, Salzburg, Austria
| | - Saul A. Villeda
- Department of Anatomy, University of California San Francisco, San Francisco, CA, United States
| | - Adam B. Schroer
- Department of Anatomy, University of California San Francisco, San Francisco, CA, United States
| | - Thomas Fröhlich
- Laboratory of Functional Genome Analysis (LAFUGA), Gene Center, Ludwig Maximilian University of Munich, Munich, Germany
| | - Vanessa Frey
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
- Department of Neurology, Christian Doppler Clinic, Paracelsus Medical University, Salzburg, Austria
| | - Wolfgang Staffen
- Department of Neurology, Christian Doppler Clinic, Paracelsus Medical University, Salzburg, Austria
| | - Heike Mrowetz
- Institute of Molecular Regenerative Medicine, Paracelsus Medical University, Salzburg, Austria
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
| | - Barbara Altendorfer
- Institute of Molecular Regenerative Medicine, Paracelsus Medical University, Salzburg, Austria
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
| | - Michael S. Unger
- Institute of Molecular Regenerative Medicine, Paracelsus Medical University, Salzburg, Austria
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
| | - Bernhard Iglseder
- Department of Neurology, Christian Doppler Clinic, Paracelsus Medical University, Salzburg, Austria
| | - Bernhard Paulweber
- Department of Internal Medicine, St. Johanns University Hospital, Paracelsus Medical University, Salzburg, Austria
| | - Eugen Trinka
- Department of Neurology, Christian Doppler Clinic, Paracelsus Medical University, Salzburg, Austria
- Department of Public Health, Health Services Research and Health Technology Assessment, UMIT-University for Health Sciences, Medical Informatics and Technology, Hall in Tirol, Austria
- Neuroscience Institute, Christian Doppler University Hospital, Paracelsus Medical University and Centre for Cognitive Neuroscience Salzburg, Salzburg, Austria
| | - Janne Cadamuro
- Department of Laboratory Medicine, University Hospital SALK, Salzburg, Austria
| | - Martin Drerup
- Department of Urology, Paracelsus Medical University, Salzburg, Austria
| | - Katharina Schallmoser
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
- Department of Transfusion Medicine, Paracelsus Medical University, Salzburg, Austria
| | - Ludwig Aigner
- Institute of Molecular Regenerative Medicine, Paracelsus Medical University, Salzburg, Austria
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
- Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Kathrin M. Kniewallner
- Institute of Molecular Regenerative Medicine, Paracelsus Medical University, Salzburg, Austria
- Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
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40
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Fu G, Yan S, Khoo CJ, Chao VC, Liu Z, Mukhi M, Hervas R, Li XD, Ti SC. Integrated regulation of tubulin tyrosination and microtubule stability by human α-tubulin isotypes. Cell Rep 2023; 42:112653. [PMID: 37379209 DOI: 10.1016/j.celrep.2023.112653] [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: 07/28/2022] [Revised: 05/03/2023] [Accepted: 05/31/2023] [Indexed: 06/30/2023] Open
Abstract
Tubulin isotypes are critical for the functions of cellular microtubules, which exhibit different stability and harbor various post-translational modifications. However, how tubulin isotypes determine the activities of regulators for microtubule stability and modifications remains unknown. Here, we show that human α4A-tubulin, a conserved genetically detyrosinated α-tubulin isotype, is a poor substrate for enzymatic tyrosination. To examine the stability of microtubules reconstituted with defined tubulin compositions, we develop a strategy to site-specifically label recombinant human tubulin for single-molecule TIRF microscopy-based in vitro assays. The incorporation of α4A-tubulin into the microtubule lattice stabilizes the polymers from passive and MCAK-stimulated depolymerization. Further characterization reveals that the compositions of α-tubulin isotypes and tyrosination/detyrosination states allow graded control for the microtubule binding and the depolymerization activities of MCAK. Together, our results uncover the tubulin isotype-dependent enzyme activity for an integrated regulation of α-tubulin tyrosination/detyrosination states and microtubule stability, two well-correlated features of cellular microtubules.
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Affiliation(s)
- Guoling Fu
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Shan Yan
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Chen Jing Khoo
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Victor C Chao
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Zheng Liu
- Department of Chemistry, The University of Hong Kong, Hong Kong SAR, China
| | - Mayur Mukhi
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Rubén Hervas
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Xiang David Li
- Department of Chemistry, The University of Hong Kong, Hong Kong SAR, China
| | - Shih-Chieh Ti
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China.
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41
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Schurr Y, Reil L, Spindler M, Nieswandt B, Machesky LM, Bender M. The WASH-complex subunit Strumpellin regulates integrin αIIbβ3 trafficking in murine platelets. Sci Rep 2023; 13:9526. [PMID: 37308549 PMCID: PMC10260982 DOI: 10.1038/s41598-023-36387-8] [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: 02/03/2023] [Accepted: 06/02/2023] [Indexed: 06/14/2023] Open
Abstract
The platelet specific integrin αIIbβ3 mediates platelet adhesion, aggregation and plays a central role in thrombosis and hemostasis. In resting platelets, αIIbβ3 is expressed on the membrane surface and in intracellular compartments. Upon activation, the number of surface-expressed αIIbβ3 is increased by the translocation of internal granule pools to the plasma membrane. The WASH complex is the major endosomal actin polymerization-promoting complex and has been implicated in the generation of actin networks involved in endocytic trafficking of integrins in other cell types. The role of the WASH complex and its subunit Strumpellin in platelet function is still unknown. Here, we report that Strumpellin-deficient murine platelets display an approximately 20% reduction in integrin αIIbβ3 surface expression. While exposure of the internal αIIbβ3 pool after platelet activation was unaffected, the uptake of the αIIbβ3 ligand fibrinogen was delayed. The number of platelet α-granules was slightly but significantly increased in Strumpellin-deficient platelets. Quantitative proteome analysis of isolated αIIbβ3-positive vesicular structures revealed an enrichment of protein markers, which are associated with the endoplasmic reticulum, Golgi complex and early endosomes in Strumpellin-deficient platelets. These results point to a so far unidentified role of the WASH complex subunit Strumpellin in integrin αIIbβ3 trafficking in murine platelets.
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Affiliation(s)
- Yvonne Schurr
- Institute of Experimental Biomedicine-Chair I, University Hospital and Rudolf Virchow Center, Josef-Schneider-Str. 2, 97080, Würzburg, Germany
| | - Lucy Reil
- Institute of Experimental Biomedicine-Chair I, University Hospital and Rudolf Virchow Center, Josef-Schneider-Str. 2, 97080, Würzburg, Germany
| | - Markus Spindler
- Institute of Experimental Biomedicine-Chair I, University Hospital and Rudolf Virchow Center, Josef-Schneider-Str. 2, 97080, Würzburg, Germany
| | - Bernhard Nieswandt
- Institute of Experimental Biomedicine-Chair I, University Hospital and Rudolf Virchow Center, Josef-Schneider-Str. 2, 97080, Würzburg, Germany
| | - Laura M Machesky
- Department of Biochemistry, University of Cambridge, Sanger Building, 80 Tennis Court Road, Cambridge, CB2 1GA, UK
| | - Markus Bender
- Institute of Experimental Biomedicine-Chair I, University Hospital and Rudolf Virchow Center, Josef-Schneider-Str. 2, 97080, Würzburg, Germany.
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42
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Elgheznawy A, Öftering P, Englert M, Mott K, Kaiser F, Kusch C, Gbureck U, Bösl MR, Schulze H, Nieswandt B, Vögtle T, Hermanns HM. Loss of zinc transporters ZIP1 and ZIP3 augments platelet reactivity in response to thrombin and accelerates thrombus formation in vivo. Front Immunol 2023; 14:1197894. [PMID: 37359521 PMCID: PMC10285393 DOI: 10.3389/fimmu.2023.1197894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/25/2023] [Indexed: 06/28/2023] Open
Abstract
Zinc (Zn2+) is considered as important mediator of immune cell function, thrombosis and haemostasis. However, our understanding of the transport mechanisms that regulate Zn2+ homeostasis in platelets is limited. Zn2+ transporters, ZIPs and ZnTs, are widely expressed in eukaryotic cells. Using mice globally lacking ZIP1 and ZIP3 (ZIP1/3 DKO), our aim was to explore the potential role of these Zn2+ transporters in maintaining platelet Zn2+ homeostasis and in the regulation of platelet function. While ICP-MS measurements indicated unaltered overall Zn2+ concentrations in platelets of ZIP1/3 DKO mice, we observed a significantly increased content of FluoZin3-stainable free Zn2+, which, however, appears to be released less efficiently upon thrombin-stimulated platelet activation. On the functional level, ZIP1/3 DKO platelets exhibited a hyperactive response towards threshold concentrations of G protein-coupled receptor (GPCR) agonists, while immunoreceptor tyrosine-based activation motif (ITAM)-coupled receptor agonist signalling was unaffected. This resulted in enhanced platelet aggregation towards thrombin, bigger thrombus volume under flow ex vivo and faster in vivo thrombus formation in ZIP1/3 DKO mice. Molecularly, augmented GPCR responses were accompanied by enhanced Ca2+ and PKC, CamKII and ERK1/2 signalling. The current study thereby identifies ZIP1 and ZIP3 as important regulators for the maintenance of platelet Zn2+ homeostasis and function.
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Affiliation(s)
- Amro Elgheznawy
- Medical Clinic II, Division of Hepatology, University Hospital Würzburg, Würzburg, Germany
| | - Patricia Öftering
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Maximilian Englert
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Kristina Mott
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Friederike Kaiser
- Department for Functional Materials in Medicine and Dentistry, University Hospital Würzburg, Würzburg, Germany
| | - Charly Kusch
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Uwe Gbureck
- Department for Functional Materials in Medicine and Dentistry, University Hospital Würzburg, Würzburg, Germany
| | - Michael R. Bösl
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Harald Schulze
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Bernhard Nieswandt
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Timo Vögtle
- Institute of Experimental Biomedicine I, University Hospital Würzburg and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Heike M. Hermanns
- Medical Clinic II, Division of Hepatology, University Hospital Würzburg, Würzburg, Germany
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43
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Tsygankov AY. TULA Proteins in Men, Mice, Hens, and Lice: Welcome to the Family. Int J Mol Sci 2023; 24:ijms24119126. [PMID: 37298079 DOI: 10.3390/ijms24119126] [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: 04/05/2023] [Revised: 05/16/2023] [Accepted: 05/18/2023] [Indexed: 06/12/2023] Open
Abstract
The two members of the UBASH3/STS/TULA protein family have been shown to critically regulate key biological functions, including immunity and hemostasis, in mammalian biological systems. Negative regulation of signaling through immune receptor tyrosine-based activation motif (ITAM)- and hemITAM-bearing receptors mediated by Syk-family protein tyrosine kinases appears to be a major molecular mechanism of the down-regulatory effect of TULA-family proteins, which possess protein tyrosine phosphatase (PTP) activity. However, these proteins are likely to carry out some PTP-independent functions as well. Whereas the effects of TULA-family proteins overlap, their characteristics and their individual contributions to cellular regulation also demonstrate clearly distinct features. Protein structure, enzymatic activity, molecular mechanisms of regulation, and biological functions of TULA-family proteins are discussed in this review. In particular, the usefulness of the comparative analysis of TULA proteins in various metazoan taxa, for identifying potential roles of TULA-family proteins outside of their functions already established in mammalian systems, is examined.
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Affiliation(s)
- Alexander Y Tsygankov
- Sol Sherry Thrombosis Research Center, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA
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44
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Naryzhny S. Quantitative Aspects of the Human Cell Proteome. Int J Mol Sci 2023; 24:ijms24108524. [PMID: 37239870 DOI: 10.3390/ijms24108524] [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: 04/06/2023] [Revised: 05/06/2023] [Accepted: 05/08/2023] [Indexed: 05/28/2023] Open
Abstract
The number and identity of proteins and proteoforms presented in a single human cell (a cellular proteome) are fundamental biological questions. The answers can be found with sophisticated and sensitive proteomics methods, including advanced mass spectrometry (MS) coupled with separation by gel electrophoresis and chromatography. So far, bioinformatics and experimental approaches have been applied to quantitate the complexity of the human proteome. This review analyzed the quantitative information obtained from several large-scale panoramic experiments in which high-resolution mass spectrometry-based proteomics in combination with liquid chromatography or two-dimensional gel electrophoresis (2DE) were used to evaluate the cellular proteome. It is important that even though all these experiments were performed in different labs using different equipment and calculation algorithms, the main conclusion about the distribution of proteome components (proteins or proteoforms) was basically the same for all human tissues or cells. It follows Zipf's law and has a formula N = A/x, where N is the number of proteoforms, A is a coefficient, and x is the limit of proteoform detection in terms of abundance.
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Affiliation(s)
- Stanislav Naryzhny
- Institute of Biomedical Chemistry, Pogodinskaya Str. 10, 119121 Moscow, Russia
- Petersburg Institute of Nuclear Physics (PNPI) of National Research Center "Kurchatov Institute", 188300 Gatchina, Russia
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45
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Trory JS, Munkacsi A, Śledź KM, Vautrinot J, Goudswaard LJ, Jackson ML, Heesom KJ, Moore SF, Poole AW, Nabet B, Aggarwal VK, Hers I. Chemical degradation of BTK/TEC as a novel approach to inhibit platelet function. Blood Adv 2023; 7:1692-1696. [PMID: 36342848 PMCID: PMC10182296 DOI: 10.1182/bloodadvances.2022008466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 11/02/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022] Open
Affiliation(s)
- Justin S. Trory
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
| | - Attila Munkacsi
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
| | - Kamila M. Śledź
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
| | - Jordan Vautrinot
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
| | - Lucy J. Goudswaard
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
- Bristol Medical School, Population Health Sciences, University of Bristol, Oakfield House, Bristol, United Kingdom
| | - Molly L. Jackson
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
| | - Kate J. Heesom
- Faculty of Life Sciences, Proteomics Facility, University of Bristol, University Walk, Biomedical Sciences Building, Bristol, United Kingdom
| | - Samantha F. Moore
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
| | - Alastair W. Poole
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
| | - Behnam Nabet
- Human Biology Division, Fred Hutchinson Cancer Center, Seattle, WA
| | - Varinder K. Aggarwal
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol, United Kingdom
| | - Ingeborg Hers
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, University Walk, Biomedical Sciences Building, Bristol BS8 1TD, United Kingdom
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Bura A, Čabrijan S, Bertović I, Jurak Begonja A. The intracellular and plasma membrane pools of phosphatidylinositol-4-monophosphate control megakaryocyte maturation and proplatelet formation. Res Pract Thromb Haemost 2023; 7:100169. [PMID: 37304829 PMCID: PMC10251075 DOI: 10.1016/j.rpth.2023.100169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 03/12/2023] [Accepted: 04/03/2023] [Indexed: 06/13/2023] Open
Abstract
Background Megakaryocytes (MKs) develop from hematopoietic stem cells after stimulation by the cytokine thrombopoietin. During megakaryopoiesis, MKs enlarge, undergo the process of endomitosis, and develop intracellular membranes (demarcation membrane system, DMS). During DMS formation, there is active transport of proteins, lipids, and membranes from the Golgi apparatus to the DMS. The most important phosphoinositide that controls anterograde transport from the Golgi apparatus to the plasma membrane (PM) is phosphatidylinositol-4-monophosphate (PI4P), whose levels are controlled by suppressor of actin mutations 1-like protein (Sac1) phosphatase at the Golgi and endoplasmic reticulum. Objectives Here we investigated the role of Sac1 and PI4P in megakaryopoiesis. Methods We analyzed Sac1 and PI4P localization in primary MKs derived from fetal liver or bone marrow and in the DAMI cell line by immunofluorescence. The intracellular and PM pools of PI4P in primary MKs were modulated by expression of Sac1 constructs from retroviral vector and inhibition of PI4 kinase IIIα, respectively. Results We showed that in primary mouse MKs, PI4P is mostly found in the Golgi apparatus and the PM in immature MKs, while in mature MKs, it is found in the cell periphery and at the PM. The exogenous expression of wild-type but not C389S mutant (catalytically dead) Sac1 results in the perinuclear retention of the Golgi apparatus resembling immature MKs, with decreased ability to form proplatelets. The pharmacologic inhibition of PI4P production specifically at the PM also resulted in a significant decrease in MKs that form proplatelets. Conclusion These results indicate that both intracellular and PM pools of PI4P mediate MK maturation and proplatelet formation.
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Affiliation(s)
| | | | | | - Antonija Jurak Begonja
- Correspondence Antonija Jurak Begonja, University of Rijeka, Department of Biotechnology, Laboratory of hematopoiesis, R. Matejcic 2, 51 000 Rijeka, Croatia. @JurakBegonja
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Cacic D, Hervig T, Reikvam H. Platelets for advanced drug delivery in cancer. Expert Opin Drug Deliv 2023; 20:673-688. [PMID: 37212640 DOI: 10.1080/17425247.2023.2217378] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 05/19/2023] [Indexed: 05/23/2023]
Abstract
INTRODUCTION Cancer-related drug expenses are rising with the increasing cancer incidence and cost may represent a severe challenge for drug access for patients with cancer. Consequently, strategies for increasing therapeutic efficacy of already available drugs may be essential for the future health-care system. AREAS COVERED In this review, we have investigated the potential for the use of platelets as drug-delivery systems. We searched PubMed and Google Scholar to identify relevant papers written in English and published up to January 2023. Papers were included at the authors' discretion to reflect an overview of state of the art. EXPERT OPINION It is known that cancer cells interact with platelets to gain functional advantages including immune evasion and metastasis development. This platelet-cancer interaction has been the inspiration for numerous platelet-based drug delivery systems using either drug-loaded or drug-bound platelets, or platelet membrane-containing hybrid vesicles combining platelet membranes with synthetic nanocarriers. Compared to treatment with free drug or synthetic drug vectors, these strategies may improve pharmacokinetics and selective cancer cell targeting. There are multiple studies showing improved therapeutic efficacy using animal models, however, no platelet-based drug delivery systems have been tested in humans, meaning the clinical relevance of this technology remains uncertain.
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Affiliation(s)
- Daniel Cacic
- Department of Hematology and Oncology, Stavanger University Hospital, Stavanger, Norway
| | - Tor Hervig
- Irish Blood Transfusion Service, Dublin, Ireland
| | - Håkon Reikvam
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Department of Medicine, Haukeland University Hospital, Bergen, Norway
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48
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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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49
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Clark JC, Martin EM, Morán LA, Di Y, Wang X, Zuidscherwoude M, Brown HC, Kavanagh DM, Hummert J, Eble JA, Nieswandt B, Stegner D, Pollitt AY, Herten DP, Tomlinson MG, García A, Watson SP. Divalent nanobodies to platelet CLEC-2 can serve as agonists or antagonists. Commun Biol 2023; 6:376. [PMID: 37029319 PMCID: PMC10082178 DOI: 10.1038/s42003-023-04766-6] [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: 01/03/2023] [Accepted: 03/27/2023] [Indexed: 04/09/2023] Open
Abstract
CLEC-2 is a target for a new class of antiplatelet agent. Clustering of CLEC-2 leads to phosphorylation of a cytosolic YxxL and binding of the tandem SH2 domains in Syk, crosslinking two receptors. We have raised 48 nanobodies to CLEC-2 and crosslinked the most potent of these to generate divalent and tetravalent nanobody ligands. Fluorescence correlation spectroscopy (FCS) was used to show that the multivalent nanobodies cluster CLEC-2 in the membrane and that clustering is reduced by inhibition of Syk. Strikingly, the tetravalent nanobody stimulated aggregation of human platelets, whereas the divalent nanobody was an antagonist. In contrast, in human CLEC-2 knock-in mouse platelets, the divalent nanobody stimulated aggregation. Mouse platelets express a higher level of CLEC-2 than human platelets. In line with this, the divalent nanobody was an agonist in high-expressing transfected DT40 cells and an antagonist in low-expressing cells. FCS, stepwise photobleaching and non-detergent membrane extraction show that CLEC-2 is a mixture of monomers and dimers, with the degree of dimerisation increasing with expression thereby favouring crosslinking of CLEC-2 dimers. These results identify ligand valency, receptor expression/dimerisation and Syk as variables that govern activation of CLEC-2 and suggest that divalent ligands should be considered as partial agonists.
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Affiliation(s)
- Joanne C Clark
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK.
| | - Eleyna M Martin
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Luis A Morán
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidade de Santiago de Compostela, and Instituto de Investigación Sanitaria de Santiago (IDIS), Santiago de Compostela, Spain
| | - Ying Di
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Xueqing Wang
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidade de Santiago de Compostela, and Instituto de Investigación Sanitaria de Santiago (IDIS), Santiago de Compostela, Spain
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Malou Zuidscherwoude
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK
| | - Helena C Brown
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Institute of Experimental Biomedicine I, University Hospital and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Deirdre M Kavanagh
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 QU3, UK
| | - Johan Hummert
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK
| | - Johannes A Eble
- Institute for Physiological Chemistry & Pathobiochemistry, University of Münster, Waldeyerstraße 15, 48149, Münster, Germany
| | - Bernhard Nieswandt
- Institute of Experimental Biomedicine I, University Hospital and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - David Stegner
- Institute of Experimental Biomedicine I, University Hospital and Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, Würzburg, Germany
| | - Alice Y Pollitt
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, RG6 6AS, UK
| | - Dirk-Peter Herten
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK
| | - Michael G Tomlinson
- Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Angel García
- Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidade de Santiago de Compostela, and Instituto de Investigación Sanitaria de Santiago (IDIS), Santiago de Compostela, Spain
| | - Steve P Watson
- Institute of Cardiovascular Sciences, Level 1 IBR, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
- Centre of Membrane Proteins and Receptors (COMPARE), The Universities of Birmingham and Nottingham, The Midlands, UK.
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50
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Solari FA, Krahn D, Swieringa F, Verhelst S, Rassaf T, Tasdogan A, Zahedi RP, Lorenz K, Renné T, Heemskerk JWM, Sickmann A. Multi-omics approaches to study platelet mechanisms. Curr Opin Chem Biol 2023; 73:102253. [PMID: 36689818 DOI: 10.1016/j.cbpa.2022.102253] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 11/17/2022] [Accepted: 11/27/2022] [Indexed: 01/22/2023]
Abstract
Platelets are small anucleate cell fragments (2-4 μm in diameter) in the blood, which play an essential role in thrombosis and hemostasis. Genetic or acquired platelet dysfunctions are linked to bleeding, increased risk of thromboembolic events and cardiovascular diseases. Advanced proteomic approaches may pave the way to a better understanding of the roles of platelets in hemostasis, and pathophysiological processes such as inflammation, metastatic spread and thrombosis. Further insights into the molecular biology of platelets are crucial to aid drug development and identify diagnostic markers of platelet activation. Platelet activation is known to be an extremely rapid process and involves multiple post-translational mechanisms at sub second time scale, including proteolysis and phosphorylation. Multi-omics technologies and biochemical approaches can be exploited to precisely probe and define these posttranslational pathways. Notably, the absence of a nucleus in platelets significantly reduces the number of present proteins, simplifying mass spectrometry-based proteomics and metabolomics approaches.
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Affiliation(s)
- Fiorella A Solari
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., 44143, Dortmund, Germany
| | - Daniel Krahn
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., 44143, Dortmund, Germany
| | - Frauke Swieringa
- Synapse Research Institute Maastricht, 6217 KD, Maastricht, the Netherlands
| | - Steven Verhelst
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., 44143, Dortmund, Germany; Department of Cellular and Molecular Medicine, KU Leuven, University of Leuven, Leuven, Belgium
| | - Tienush Rassaf
- Clinic for Cardiology and Angiology, University Hospital Essen, Essen, Germany
| | - Alpaslan Tasdogan
- Department of Dermatology, University Hospital Essen & German Cancer Consortium, Partner Site, Essen, Germany
| | - Rene P Zahedi
- Department of Internal Medicine, University of Manitoba, Canada
| | - Kristina Lorenz
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., 44143, Dortmund, Germany; Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
| | - Thomas Renné
- Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | - Albert Sickmann
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., 44143, Dortmund, Germany; Medizinische Fakultät, Ruhr-Universität Bochum, Bochum, Germany; Department of Chemistry, College of Physical Sciences, University of Aberdeen, Aberdeen, United Kingdom.
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