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Jooss NJ, Diender MG, Fernández DI, Huang J, Heubel-Moenen FCJ, van der Veer A, Kuijpers MJE, Poulter NS, Henskens YMC, Te Loo M, Heemskerk JWM. Restraining of glycoprotein VI- and integrin α2β1-dependent thrombus formation by platelet PECAM1. Cell Mol Life Sci 2024; 81:44. [PMID: 38236412 PMCID: PMC10796532 DOI: 10.1007/s00018-023-05058-2] [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: 07/14/2023] [Revised: 10/15/2023] [Accepted: 11/21/2023] [Indexed: 01/19/2024]
Abstract
The platelet receptors, glycoprotein VI (GPVI) and integrin α2β1 jointly control collagen-dependent thrombus formation via protein tyrosine kinases. It is unresolved to which extent the ITIM (immunoreceptor tyrosine-based inhibitory motif) receptor PECAM1 and its downstream acting protein tyrosine phosphatase PTPN11 interfere in this process. Here, we hypothesized that integrin α2β1 has a co-regulatory role in the PECAM1- and PTPN11-dependent restraint of thrombus formation. We investigated platelet activation under flow on collagens with a different GPVI dependency and using integrin α2β1 blockage. Blood was obtained from healthy subjects and from patients with Noonan syndrome with a gain-of-function mutation of PTPN11 and variable bleeding phenotype. On collagens with decreasing GPVI activity (types I, III, IV), the surface-dependent inhibition of PECAM1 did not alter thrombus parameters using control blood. Blockage of α2β1 generally reduced thrombus parameters, most effectively on collagen IV. Strikingly, simultaneous inhibition of PECAM1 and α2β1 led to a restoration of thrombus formation, indicating that the suppressing signaling effect of PECAM1 is masked by the platelet-adhesive receptor α2β1. Blood from 4 out of 6 Noonan patients showed subnormal thrombus formation on collagen IV. In these patients, effects of α2β1 blockage were counterbalanced by PECAM1 inhibition to a normal phenotype. In summary, we conclude that the suppression of GPVI-dependent thrombus formation by either PECAM1 or a gain-of-function of PTPN11 can be overruled by α2β1 engagement.
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Affiliation(s)
- Natalie J Jooss
- Department of Biochemistry, Maastricht University, Maastricht, The Netherlands
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Molecular Haematology Unit, University of Oxford, Headington, OX3 9DS, UK
| | - Marije G Diender
- Department of Pediatric Hematology, Amalia Children's Hospital, Radboud UMC, Nijmegen, The Netherlands
| | - Delia I Fernández
- Department of Biochemistry, Maastricht University, Maastricht, The Netherlands
- Platelet Proteomics Group, Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | - Jingnan Huang
- Department of Biochemistry, Maastricht University, Maastricht, The Netherlands
- Platelet Proteomics Group, Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | - Floor C J Heubel-Moenen
- Department of Internal Medicine, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Arian van der Veer
- Department of Pediatric Hematology, Amalia Children's Hospital, Radboud UMC, Nijmegen, The Netherlands
- Department of Pediatric Hematology, Maastricht University Medical Center, Maastricht, The Netherlands
| | | | - Natalie S Poulter
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, Nottingham, Midlands, UK
| | - Yvonne M C Henskens
- Central Diagnostic Laboratory, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Maroeska Te Loo
- Department of Pediatric Hematology, Amalia Children's Hospital, Radboud UMC, Nijmegen, The Netherlands
| | - Johan W M Heemskerk
- Department of Biochemistry, Maastricht University, Maastricht, The Netherlands.
- Synapse Research Institute Maastricht, Kon. Emmaplein 7, 6217 KD, Maastricht, The Netherlands.
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Wang Y, Zhang Y, Wang Y, Liu H, Liu Y. Top of basilar syndrome due to vertebral artery dissection: How high-resolution MRI and CD31 analysis of thrombus could help. Int J Surg Case Rep 2023; 112:108948. [PMID: 37832359 PMCID: PMC10667724 DOI: 10.1016/j.ijscr.2023.108948] [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: 09/04/2023] [Revised: 10/06/2023] [Accepted: 10/07/2023] [Indexed: 10/15/2023] Open
Abstract
INTRODUCTION AND IMPORTANCE Vertebral artery dissection is a rare but serious condition that can lead to neurological deficits and even death. It is commonly associated with trauma or underlying vascular diseases. Top of basilar syndrome (TOBS) is a neurological condition that can result from vertebral artery dissection, either by direct ischemia or secondary occlusion due to distal embolization of injured inner vascular tissue. We here present a patient who was initially suffering from seizure then had TOBS due to a progressive vertebral artery dissection, with emphasis of high-resolution MRI imaging and immunohistochemistry study of the thrombus. CASE PRESENTATION A young male presented to the emergency department with sudden onset of seizure. A history of recent neck exercise was reported. The patient had gaze palsy, adduction disability, and dysarthria. High-resolution MRI showed a vertebral artery dissection with evidence of occlusion of the top of basilar artery. After the thrombectomy, a pathologic study revealed CD31[+] tissue in the thrombus, indicating an origin from dissected vertebral artery. CLINICAL DISCUSSION AND CONCLUSION It's important to recognize and treat vertebral artery dissection promptly due to its varying symptoms. Using high-resolution MRI at early stage and conducting pathologic analysis of CD31 on the thrombus can assist in the diagnosis, potentially leading to more precise treatment plans and better outcomes for patients.
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Affiliation(s)
- Yu Wang
- Department of Neurosurgery, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, PR China
| | - Yao Zhang
- Department of Pathology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, PR China
| | - Yang Wang
- Department of Neurosurgery, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, PR China
| | - He Liu
- Department of Neurosurgery, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, PR China
| | - Yunpeng Liu
- Department of Neurosurgery, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, PR China.
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Vinci R, Pedicino D, Bonanni A, d'Aiello A, Pisano E, Ponzo M, Severino A, Ciampi P, Canonico F, Russo G, Di Sario M, Vergallo R, Filomia S, Montone RA, Flego D, Stefanini L, Piacentini R, Conte C, Cribari F, Massetti M, Crea F, Liuzzo G. Monocyte-Platelet Aggregates Triggered by CD31 Molecule in Non-ST Elevation Myocardial Infarction: Clinical Implications in Plaque Rupture. Front Cardiovasc Med 2022; 8:741221. [PMID: 35146002 PMCID: PMC8821091 DOI: 10.3389/fcvm.2021.741221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 12/20/2021] [Indexed: 11/13/2022] Open
Abstract
Despite the recent innovations in cardiovascular care, atherothrombosis is still a major complication of acute coronary syndromes (ACS). We evaluated the involvement of the CD31 molecule in thrombotic risk through the formation of monocyte-platelet (Mo-Plt) aggregates in patients with ACS with no-ST-segment elevation myocardial infarction (NSTEMI) on top of dual anti-platelet therapy (DAPT). We enrolled 19 control (CTRL) subjects, 46 stable angina (SA), and 86 patients with NSTEMI, of which, 16 with Intact Fibrous Cap (IFC) and 19 with Ruptured Fibrous Cap (RFC) as assessed by the Optical Coherence Tomography (OCT). The expression of CD31 on monocytes and platelets was measured. Following the coronary angiography, 52 NSTEMIs were further stratified according to thrombus grade (TG) evaluation. Finally, a series of ex vivo experiments verified whether the CD31 participates in Mo-Plt aggregate formation. In patients with NSTEMI, CD31 was reduced on monocytes and was increased on platelets, especially in NSTEMI presented with RFC plaques compared to those with IFC lesions, and in patients with high TG compared to those with zero/low TG. Ex vivo experiments documented an increase in Mo-Plt aggregates among NSTEMI, which significantly decreased after the CD31 ligation, particularly in patients with RFC plaques. In NSTEMI, CD31 participates in Mo-Plt aggregate formation in spite of optimal therapy and DAPT, suggesting the existence of alternative thrombotic pathways, as predominantly displayed in patients with RFC.
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Affiliation(s)
- Ramona Vinci
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Daniela Pedicino
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
- *Correspondence: Daniela Pedicino
| | - Alice Bonanni
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Alessia d'Aiello
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Eugenia Pisano
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Myriana Ponzo
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Anna Severino
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Pellegrino Ciampi
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Francesco Canonico
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Giulio Russo
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Marianna Di Sario
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Rocco Vergallo
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Simone Filomia
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Rocco Antonio Montone
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Davide Flego
- Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome, Italy
| | - Lucia Stefanini
- Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome, Italy
| | - Roberto Piacentini
- Department of Neuroscience, Università Cattolica del Sacro Cuore, Rome, Italy
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Cristina Conte
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Francesco Cribari
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Massimo Massetti
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Filippo Crea
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | - Giovanna Liuzzo
- Department of Cardiovascular and Pulmonary Sciences, Università Cattolica del Sacro Cuore, Rome, Italy
- Department of Cardiovascular Sciences, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
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Effects of VEGFR1 + hematopoietic progenitor cells on pre-metastatic niche formation and in vivo metastasis of breast cancer cells. J Cancer Res Clin Oncol 2018; 145:411-427. [PMID: 30483898 PMCID: PMC6373264 DOI: 10.1007/s00432-018-2802-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 11/19/2018] [Indexed: 02/07/2023]
Abstract
The pre-metastatic niche has been shown to play a critical role in tumor metastasis, and its formation is closely related to the tumor microenvironment. However, the underlying molecular mechanisms remain unclear. In the present study, we successfully established a mouse model of lung metastasis using luciferase-expressing MDA-MB-435s cells. In this model, recruitment of vascular endothelial growth factor receptor-1 (VEGFR1)+CD133+ hematopoietic progenitor cells (HPCs) was gradually increased in lung but gradually decreased after the formation of tumor colonies in lung. We also established a highly metastatic MDA-MB-435s (MDA-MB-435s-HM) cell line from the mouse model. Changes in protein profiles in different culture conditions were investigated by protein microarray analysis. The levels of CXC chemokine ligand 16, interleukin (IL)-2Rα, IL-2Rγ, matrix metalloproteinase (MMP)-1, MMP-9, platelet-derived growth factor receptor (PDGFR)-α, stromal cell-derived factor (SDF)-1α, transforming growth factor (TGF)-β, platelet endothelial cell adhesion molecule (PECAM)-1 and vascular endothelial (VE)-cadherin were significantly greater (> fivefold) in the culture medium from MDA-MB-435s-HM cells than in that from MDA-MB-435s cells. Moreover, the levels of MMP-9, PDGFR-α, and PECAM-1 were significantly greater in the co-culture medium of MDA-MB-435s-HM cells and CD133+ HPCs than in that from MDA-MB-435s-HM cells. Differentially expressed proteins were validated by enzyme-linked immunosorbent assay, and expression of their transcripts was confirmed by quantitative real-time polymerase chain reaction. Moreover, inhibition of MMP-9, PDGFR-α, and PECAM-1 by their specific inhibitors or antibodies significantly decreased cell migration, delayed lung metastasis, and decreased recruitment of VEGFR1+CD133+ HPCs into lung. Intra-hepatic growth of HPCs enhanced the invasive growth of MDA-MB-435s-HM cells in the liver. Our data indicate that VEGFR1+CD133+ HPCs contribute to lung metastasis.
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6
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Saikia J, Mohammadpour R, Yazdimamaghani M, Northrup H, Hlady V, Ghandehari H. Silica Nanoparticle-Endothelial Interaction: Uptake and Effect on Platelet Adhesion under Flow Conditions. ACS APPLIED BIO MATERIALS 2018; 1:1620-1627. [PMID: 34046558 DOI: 10.1021/acsabm.8b00466] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Silica nanoparticles are extensively used in biomedical applications and consumer products. Little is known about the interaction of these NPs with the endothelium and effect on platelet adhesion under flow conditions in circulation. In this study, we investigated the effect of silica nanoparticles on the endothelium and its inflammation, and subsequent adhesion of flowing platelets in vitro. Platelet counts adhered onto the surface of endothelial cells in the presence of nanoparticles increased at both low and high concentrations of nanoparticles. Preincubation of endothelial cells with nanoparticles also increased platelet adhesion. Interestingly, platelet adhesion onto TNF-α-treated endothelial cells decreased in the presence of nanoparticles at different concentrations as compared with the absence of nanoparticles. We monitored the expression of different endothelial proteins, known to initiate platelet adhesion, in the presence and absence of silica nanoparticles. We found that silica nanoparticles caused changes in the endothelium such as overexpression of PECAM that promoted platelet adhesion to the endothelial cell.
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Affiliation(s)
- Jiban Saikia
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah 84112, United States.,Department of Chemistry, Dibrugarh University, Dibrugarh, Assam 786004, India
| | - Raziye Mohammadpour
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah 84112, United States
| | - Mostafa Yazdimamaghani
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah 84112, United States.,Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Hannah Northrup
- Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112, United States
| | - Vladimir Hlady
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah 84112, United States.,Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112, United States
| | - Hamidreza Ghandehari
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, Salt Lake City, Utah 84112, United States.,Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.,Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112, United States
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7
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Bye AP, Ilkan Z, Unsworth AJ, Jones CI. Immobilization of Nonactivated Unfixed Platelets for Real-Time Single-Cell Analysis. Methods Mol Biol 2018; 1812:1-11. [PMID: 30171569 DOI: 10.1007/978-1-4939-8585-2_1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/24/2023]
Abstract
Existing methods for measuring the response of individual platelets to stimulation are limited. They either measure each platelet at one discrete time-point (flow cytometry) or rely on adhesive ligands to immobilize platelets that concomitantly generate activation signals (microscopy). Such methods of immobilization make it impossible to assess resting platelets, the changes that occur as platelets transition from resting to active states, or the signals generated by soluble agonists, such as ADP and thrombin, or by mechanical stimulus, independently from those generated by the adhesive ligand. Here we describe a microscopy method that allows the immobilization of platelets to a glass cover slip without triggering platelet activation. This method makes use of specific antibodies that bind platelet PECAM-1 without activating it. Platelets can therefore be immobilized to PECAM-1 antibody coated biochips without causing activation and perfused with agonists or inhibitors. Using this method, platelets can be stimulated by an array of soluble agonists at any concentration or combination, in the presence or absence of inhibitors or shear forces. This chapter describes in detail this PECAM-1 mediated immobilized platelet method and its use for measuring changes in Ca2+ signaling in individual platelets under a number of different conditions. While we focus on the measurement of Ca2+ dynamics in this chapter, it is important to consider that the basic method we describe will easily lend its self to other measures of platelet activation (integrin activation, shape change, actin dynamics, degranulation), and may, therefore, be used to measure almost any facet of platelet activation.
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Affiliation(s)
- Alexander P Bye
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Zeki Ilkan
- Department of Molecular and Cell Biology, University of Leicester, Leicester, UK
| | - Amanda J Unsworth
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK
| | - Chris I Jones
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, University of Reading, Reading, UK.
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8
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Unsworth AJ, Bye AP, Gibbins JM. Platelet-Derived Inhibitors of Platelet Activation. PLATELETS IN THROMBOTIC AND NON-THROMBOTIC DISORDERS 2017. [PMCID: PMC7123044 DOI: 10.1007/978-3-319-47462-5_37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Jones CI, Barrett NE, Moraes LA, Gibbins JM, Jackson DE. Endogenous inhibitory mechanisms and the regulation of platelet function. Methods Mol Biol 2012; 788:341-66. [PMID: 22130718 DOI: 10.1007/978-1-61779-307-3_23] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The response of platelets to changes in the immediate environment is always a balance between activatory and inhibitory signals, the cumulative effect of which is either activation or quiescence. This is true of platelets in free flowing blood and of their regulation of haemostasis and thrombosis. In this review, we consider the endogenous inhibitory mechanisms that combine to regulate platelet activation. These include those derived from the endothelium (nitric oxide, prostacyclin, CD39), inhibitory receptors on the surface of platelets (platelet endothelial cell adhesion molecule-1, carcinoembryonic antigen cell adhesion molecule 1, G6b-B - including evidence for the role of Ig-ITIM superfamily members in the negative regulation of ITAM-associated GPVI platelet-collagen interactions and GPCR-mediated signalling and in positive regulation of "outside-in" integrin α(IIb)β(3)-mediated signalling), intracellular inhibitory receptors (retinoic X receptor, glucocorticoid receptor, peroxisome proliferator-activated receptors, liver X receptor), and emerging inhibitory pathways (canonical Wnt signalling, Semaphorin 3A, endothelial cell specific adhesion molecule, and junctional adhesion molecule-A).
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Affiliation(s)
- Chris I Jones
- Institute for Cardiovascular and Metabolic Research, School of Biological Sciences, The University of Reading, Reading, UK
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10
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Novinska MS, Rathore V, Newman DK, Newman PJ. PECAM-1. Platelets 2007. [DOI: 10.1016/b978-012369367-9/50773-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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11
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Lee FA, van Lier M, Relou IAM, Foley L, Akkerman JWN, Heijnen HFG, Farndale RW. Lipid rafts facilitate the interaction of PECAM-1 with the glycoprotein VI-FcR gamma-chain complex in human platelets. J Biol Chem 2006; 281:39330-8. [PMID: 17068334 DOI: 10.1074/jbc.m607930200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Glycoprotein (GP) VI, the main signaling receptor for collagen on platelets, is expressed in complex with the FcR gamma-chain. The latter contains an immunoreceptor tyrosine-based activation motif, which becomes phosphorylated, initiating a signaling cascade leading to the rapid activation and aggregation of platelets. Previous studies have shown that signaling by immunoreceptor tyrosine-based activation motif-containing receptors is counteracted by signals from receptors with immunoreceptor tyrosine-based inhibitory motifs. Here we show, by immunoprecipitation, that the GPVI-FcR gamma-chain complex associates with the immunoreceptor tyrosine-based inhibitory motif-containing receptor, PECAM-1. In platelets stimulated with collagen-related peptide (CRP-XL), tyrosine phosphorylation of PECAM-1 precedes that of the FcR gamma-chain, implying direct regulation of the former. The GPVI-FcR gamma-chain complex and PECAM-1 were present in both lipid raft and soluble fractions in human platelets; this distribution was unaltered by activation with CRP-XL. Their association occurred in lipid rafts and was lost after lipid raft depletion using methyl-beta-cyclodextrin. We propose that lipid raft clustering facilitates the interaction of PECAM-1 with the GPVI-FcR gamma-chain complex, leading to the down-regulation of the latter.
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Affiliation(s)
- Fiona A Lee
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, United Kingdom
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12
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Cicmil M, Thomas JM, Leduc M, Bon C, Gibbins JM. Platelet endothelial cell adhesion molecule-1 signaling inhibits the activation of human platelets. Blood 2002; 99:137-44. [PMID: 11756163 DOI: 10.1182/blood.v99.1.137] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Platelet endothelial cell adhesion molecule-1 (PECAM-1/CD31) is a 130-kd transmembrane glycoprotein and a member of the growing family of receptors with immunoreceptor tyrosine-based inhibitory motifs (ITIMs). PECAM-1 is expressed on platelets, certain T cells, monocytes, neutrophils, and vascular endothelial cells and is involved in a range of cellular processes, though the role of PECAM-1 in platelets is unclear. Cross-linking of PECAM-1 results in phosphorylation of the ITIM allowing the recruitment of signaling proteins that bind by way of Src-homology domain 2 interactions. Proteins that have been implicated in the negative regulation of cellular activation by ITIM-bearing receptors include the tyrosine phosphatases SHP-1 and SHP-2. Tyrosine phosphorylation of immunoreceptor tyrosine-based activatory motif (ITAM)-bearing receptors such as the collagen receptor GPVI-Fc receptor gamma-chain complex on platelets leads to activation. Increasing evidence suggests that ITIM- and ITAM-containing receptors may act antagonistically when expressed on the same cell. In this study it is demonstrated that cross-linking PECAM-1 inhibits the aggregation and secretion of platelets in response to collagen and the GPVI-selective agonist convulxin. In these experiments thrombin-mediated platelet aggregation and secretion were also reduced, albeit to a lesser degree than for collagen, suggesting that PECAM-1 function may not be restricted to the inhibition of ITAM-containing receptor pathways. PECAM-1 activation also inhibited platelet protein tyrosine phosphorylation stimulated by convulxin and thrombin; this was accompanied by inhibition of the mobilization of calcium from intracellular stores. These data suggest that PECAM-1 may play a role in the regulation of platelet function in vivo.
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Affiliation(s)
- Milenko Cicmil
- School of Animal and Microbial Sciences, University of Reading, United Kingdom
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Naik UP, Naik MU, Eckfeld K, Martin-DeLeon P, Spychala J. Characterization and chromosomal localization of JAM-1, a platelet receptor for a stimulatory monoclonal antibody. J Cell Sci 2001; 114:539-47. [PMID: 11171323 DOI: 10.1242/jcs.114.3.539] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
We have previously reported the purification and characterization of a 32 kDa platelet surface glycoprotein that is recognized by the stimulatory monoclonal antibody, F11. The cDNA has been cloned and found to encode the human homolog of the murine junctional adhesion molecule, JAM; we therefore named this human homolog JAM-1. Northern blot analysis indicated that JAM-1 mRNA is expressed as multiple species, the predominant transcript being approximately 4.0 kb in size. Genetic mapping analysis using fluorescence in situ hybridization (FISH) showed that it is localized to chromosome 1q21.1-21.3. Recombinant JAM-1, when expressed in Chinese hamster ovary (CHO) cells, localized to the cell membrane with intense staining where two adjacent cells actually made contact with each other, suggesting that, similar to murine JAM, human JAM-1 may also localize at the cell-cell junction. In well-spread cells, JAM-1 co-localized with F-actin at the cell-cell contacts and at the membrane ruffles, but not at the stress fibers. Interestingly, JAM-1 localizes only to the cell-cell junctions formed by two transfected cells and not to the cell-cell junctions formed by a transfected cell with an untransfected cell, suggesting that JAM-1 may facilitate cell adhesion through homophilic binding. In addition, human platelets specifically bind to a monolayer of CHO cells expressing human JAM-1, further supporting homophilic interactions. The results presented here indicate that JAM-1, a receptor for a platelet-activating antibody, is the human homolog of the junctional adhesion molecule. JAM-1 is a single copy gene, which is constitutively expressed on various tissues and cells, and may be involved in cell to cell adhesion through homophilic interaction.
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Affiliation(s)
- U P Naik
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA.
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Hashimoto T, Emala CW, Joshi S, Mesa-Tejada R, Quick CM, Feng L, Libow A, Marchuk DA, Young WL. Abnormal pattern of Tie-2 and vascular endothelial growth factor receptor expression in human cerebral arteriovenous malformations. Neurosurgery 2000; 47:910-8; discussion 918-9. [PMID: 11014431 DOI: 10.1097/00006123-200010000-00022] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE Human cerebral arteriovenous malformations (AVMs) are speculated to result from abnormal angiogenesis. Vascular endothelial growth factor receptors (VEGF-Rs) and Tie-2 play critical roles in vasculogenesis and angiogenesis. We hypothesized that the abnormal vascular phenotype of AVMs may be associated with abnormal expression of VEGF-Rs and Tie-2. METHODS We measured the expression of Tie-2, VEGF-R1, and VEGF-R2 in AVMs and normal brain tissue, using immunoblotting. To assess active vascular remodeling, we also measured endothelial nitric oxide synthase expression. CD31 expression was used to control for endothelial cell mass for Tie-2, VEGF-Rs, and endothelial nitric oxide synthase. Immunoblotting data were presented as relative expression, using normal brain tissue values as 100%. RESULTS CD31 was expressed to similar degrees in AVMs and normal brain tissue (99+/-29% versus 100+/-20%, mean +/- standard error, P = 0.98). Tie-2 expression was markedly decreased in all AVMs, compared with normal brain tissue (16+/-9% versus 100+/-37%, P = 0.04). VEGF-R1 expression was decreased in four of five AVMs, but the difference between the mean values was not significant (35+/-8% versus 100+/-42%, P = 0.14). VEGF-R2 expression was decreased in all AVMs, compared with normal brain tissue (28+/-6% versus 100+/-29%, P = 0.03). There was no difference in endothelial nitric oxide synthase expression between AVMs and normal brain tissue (106+/-42% versus 100+/-25%, P = 0.91). CONCLUSION AVM vessels exhibited abnormal expression of Tie-2 and VEGF-Rs, both of which may contribute to the pathogenesis of AVMs.
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Affiliation(s)
- T Hashimoto
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, USA
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Mahooti S, Graesser D, Patil S, Newman P, Duncan G, Mak T, Madri JA. PECAM-1 (CD31) expression modulates bleeding time in vivo. THE AMERICAN JOURNAL OF PATHOLOGY 2000; 157:75-81. [PMID: 10880378 PMCID: PMC1850208 DOI: 10.1016/s0002-9440(10)64519-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PECAM-1 is a 130-kd member of the Ig superfamily present on endothelial cells, platelets, polymorphonuclear leukocytes, monocytes, and lymphocytes. Its expression begins early in development and persists through adulthood. PECAM-1 functions as an adhesion and signaling molecule between adjacent endothelial cells and between endothelial cells and circulating blood elements. Antibodies directed against PECAM-1 have been shown to affect angiogenesis, endothelial cell migration, and polymorphonuclear leukocyte transmigration. Furthermore, its dimerization is associated with the modulation of integrin affinity. Antibody inhibition studies suggest that PECAM-1 plays a role in modulating thrombosis; however, recent in vitro aggregation studies performed on platelets harvested from PECAM-1-deficient mice revealed no abnormalities. In this report we demonstrate prolonged in vivo bleeding times in PECAM-1-deficient mice. This abnormality was not corrected when wild-type hematopoietic precursors were engrafted into marrow-ablated PECAM-1-deficient mice. Furthermore, normal bleeding times were observed when marrow-ablated wild-type mice were engrafted with hematopoietic precursors harvested from PECAM-1-deficient mice. These studies are consistent with a role for PECAM-1 in modulating thrombosis in the vasculature, which is potentially mediated by endothelial cell PECAM-1 expression.
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Affiliation(s)
- S Mahooti
- Department of Pathology, Yale University School of Medicine, New Haven, CT 06520-8023, USA
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Salat A, Bodingbauer G, Boehm D, Murabito M, Tochkow E, Sautner T, Mueller MR, Fuegger R. Changes of platelet surface antigens in patients suffering from abdominal septic shock. Thromb Res 1999; 95:289-94. [PMID: 10527406 DOI: 10.1016/s0049-3848(99)00046-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Sepsis and related syndromes account for a high morbidity and mortality caused by the development of multiorgan failure. Pathogenesis of sepsis is complex, involving humoral as well as cellular factors. Since the role of platelets is still undefined in this concern, we investigated CD63, CD62P, CD36, and CD31 expression on platelets of patients in septic shock (n = 18) using a flow cytometric assay in whole blood. Samples were drawn within 24 hours of onset. We found thrombocytopenia accompanied by a significantly higher expression of CD63, CD62P, and CD31 and a significant downregulation of CD36 in comparison to healthy volunteers (n = 18). Changes in CD63 and CD62P expression indicates platelet activation. Because CD62P, CD36, and CD31 mediate interaction of platelets with leukocytes, subendothelial matrix and probably endothelial cells as well as platelet adhesion/aggregation, our findings suggest an involvement of platelets in leukocyte/endothelial cell interaction in septic shock. We suspect that thrombocytopenia is not due to bone marrow depression, but rather is due to consumption of highly activated platelets in the microcirculation. We feel that our observations may offer a rationale for potentially beneficial effects of antiplatelet therapy in sepsis; however, further studies have to evaluate its beneficial impact as well as its potential risk for bleeding complications.
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Affiliation(s)
- A Salat
- Department of General Surgery, University of Vienna, Austria.
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