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Wurtzel JGT, Lazar S, Askari S, Zhao X, Severa J, Ayombil F, Michael JV, Camire RM, McKenzie SE, Stalker TJ, Ma P, Goldfinger LE. Plasma growth factors maintain constitutive translation in platelets to regulate reactivity and thrombotic potential. Blood Adv 2024; 8:1550-1566. [PMID: 38163324 PMCID: PMC10982986 DOI: 10.1182/bloodadvances.2023011734] [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] [Received: 09/20/2023] [Revised: 11/14/2023] [Accepted: 11/30/2023] [Indexed: 01/03/2024] Open
Abstract
ABSTRACT Mechanisms of proteostasis in anucleate circulating platelets are unknown and may regulate platelet function. We investigated the hypothesis that plasma-borne growth factors/hormones (GFHs) maintain constitutive translation in circulating platelets to facilitate reactivity. Bio-orthogonal noncanonical amino acid tagging (BONCAT) coupled with liquid chromatography-tandem mass spectrometry analysis revealed constitutive translation of a broad-spectrum translatome in human platelets dependent upon plasma or GFH exposure, and in murine circulation. Freshly isolated platelets from plasma showed homeostatic activation of translation-initiation signaling pathways: phosphorylation of p38/ERK upstream kinases, essential intermediate MNK1/2, and effectors eIF4E/4E-BP1. Plasma starvation led to loss of pathway phosphorylation, but it was fully restored with 5-minute stimulation by plasma or GFHs. Cycloheximide or puromycin infusion suppressed ex vivo platelet GpIIb/IIIa activation and P-selectin exposure with low thrombin concentrations and low-to-saturating concentrations of adenosine 5'-diphosphate (ADP) or thromboxane analog but not convulxin. ADP-induced thromboxane generation was blunted by translation inhibition, and secondary-wave aggregation was inhibited in a thromboxane-dependent manner. Intravenously administered puromycin reduced injury-induced clot size in cremaster muscle arterioles, and delayed primary hemostasis after tail tip amputation but did not delay neither final hemostasis after subsequent rebleeds, nor final hemostasis after jugular vein puncture. In contrast, these mice were protected from injury-induced arterial thrombosis and thrombin-induced pulmonary thromboembolism (PE), and adoptive transfer of translation-inhibited platelets into untreated mice inhibited arterial thrombosis and PE. Thus, constitutive plasma GFH-driven translation regulates platelet G protein-coupled receptor reactivity to balance hemostasis and thrombotic potential.
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Affiliation(s)
- Jeremy G. T. Wurtzel
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Sophia Lazar
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Shayan Askari
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Xuefei Zhao
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Jenna Severa
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Francis Ayombil
- Division of Hematology and the Raymond G. Perelman Center for Cellular and Molecular Therapeutics, The Children’s Hospital of Philadelphia, Philadelphia, PA
| | - James V. Michael
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Rodney M. Camire
- Division of Hematology and the Raymond G. Perelman Center for Cellular and Molecular Therapeutics, The Children’s Hospital of Philadelphia, Philadelphia, PA
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Steven E. McKenzie
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Timothy J. Stalker
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Peisong Ma
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Lawrence E. Goldfinger
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
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2
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Thibord F, Johnson AD. Sources of variability in the human platelet transcriptome. Thromb Res 2023; 231:255-263. [PMID: 37357099 DOI: 10.1016/j.thromres.2023.06.009] [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: 03/31/2023] [Revised: 05/31/2023] [Accepted: 06/09/2023] [Indexed: 06/27/2023]
Abstract
Platelets are anucleated cells produced by megakaryocytes, from which they inherit all the components necessary to carry their functions. They circulate in blood vessels where they play essential roles in coagulation, wound repair or inflammation, and have been implicated in various pathological conditions such as thrombosis, viral infection or cancer progression. The importance of these cells has been established over a century ago, and effective anti-platelet medications with different mechanisms of action have since been developed. However, these therapies are not always effective and can incur adverse events, thus a better understanding of platelets molecular processes is needed to address these issues and improve our understanding of platelet functions. In recent years, an increasing number of studies have leveraged OMICs technologies to analyze their content and identify molecular signatures and mechanisms associated with platelet functions and platelet related disorders. In particular, the increased accessibility of microarrays and RNA sequencing opened the way for studies of the platelet transcriptome under a wide array of conditions. These studies revealed distinct expression profiles in diverse pathologies, which could lead to the discovery of novel biomarkers and therapeutic targets, and suggests a dynamic transcriptome that could influence platelet mechanisms. In this review, we highlight the different sources of transcript level variability in platelets while summarizing recent advances and discoveries from this emerging field.
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Affiliation(s)
- Florian Thibord
- Population Sciences Branch, Division of Intramural Research, National Heart, Lung and Blood Institute, 73 Mt. Wayte, Suite #2, Framingham, MA 01702, USA; The Framingham Heart Study, Boston University and NHLBI, 73 Mt. Wayte Ave, Suite #2, Framingham, MA 01702, USA.
| | - Andrew D Johnson
- Population Sciences Branch, Division of Intramural Research, National Heart, Lung and Blood Institute, 73 Mt. Wayte, Suite #2, Framingham, MA 01702, USA; The Framingham Heart Study, Boston University and NHLBI, 73 Mt. Wayte Ave, Suite #2, Framingham, MA 01702, USA
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3
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Miao S, Zhang Q, Chang W, Wang J. New Insights Into Platelet-enriched miRNAs: Production, Functions, Roles in Tumors, and Potential Targets for Tumor Diagnosis and Treatment. Mol Cancer Ther 2021; 20:1359-1366. [PMID: 34045229 DOI: 10.1158/1535-7163.mct-21-0050] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 03/12/2021] [Accepted: 05/03/2021] [Indexed: 11/16/2022]
Abstract
In view of the increasing number of malignant tumors worldwide and their high mortality, efforts are being made to find effective biomarkers for early detection and effective treatment measures of cancer. In recent years, the roles of platelets in tumors have attracted considerable attention. Although platelets do not have nuclei, they are rich in miRNAs, which are important molecules in platelet regulation of tumors. Platelet miRNA expression in tumor patients is abnormal and tumor-specific. Platelet miRNAs have higher accuracy and specificity than conventional tumor detection markers and circulating miRNAs in tumor diagnosis. Platelets enriched miRNAs are involved in the regulation of tumor proliferation, metastasis, tumor-related immunity, tumor-related thrombosis, and antitumor therapy. To understand the role of platelet miRNAs in tumors, this article reviews the biological functions of miRNAs in platelets and summarizes the regulatory roles of platelet miRNAs in tumors and the potential roles of platelet miRNAs in tumor diagnosis and treatment.
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Affiliation(s)
- Shuo Miao
- School of Basic Medicine, Qingdao University, Qingdao, China
| | - Qingsong Zhang
- Department of Urology, Affiliated Hospital of Qingdao University, Qingdao, China
| | - Wenguang Chang
- Institute for Translational Medicine, Qingdao University, Qingdao, China
| | - Jianxun Wang
- School of Basic Medicine, Qingdao University, Qingdao, China.
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4
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Provost P. Platelet MicroRNAs. Platelets 2019. [DOI: 10.1016/b978-0-12-813456-6.00006-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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5
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6
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Jung RG, Simard T, Labinaz A, Ramirez FD, Di Santo P, Motazedian P, Rochman R, Gaudet C, Faraz MA, Beanlands RS, Hibbert B. Role of plasminogen activator inhibitor-1 in coronary pathophysiology. Thromb Res 2018; 164:54-62. [DOI: 10.1016/j.thromres.2018.02.135] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 02/03/2018] [Accepted: 02/15/2018] [Indexed: 01/13/2023]
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7
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Egea V, Weber C, Schober A. Circulating miRNAs: messengers on the move in cardiovascular disease. Thromb Haemost 2017; 108:590-1. [DOI: 10.1160/th12-08-0613] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Accepted: 08/30/2012] [Indexed: 12/18/2022]
Abstract
Note: The review process for this paper was fully handled by G. Y. H. Lip, Editor in Chief.
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8
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Slowed decay of mRNAs enhances platelet specific translation. Blood 2017; 129:e38-e48. [PMID: 28213379 DOI: 10.1182/blood-2016-08-736108] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 12/31/2016] [Indexed: 11/20/2022] Open
Abstract
Platelets are anucleate cytoplasmic fragments that lack genomic DNA, but continue to synthesize protein using a pool of messenger RNAs (mRNAs), ribosomes, and regulatory small RNAs inherited from the precursor megakaryocyte (MK). The regulatory processes that shape the platelet transcriptome and the full scope of platelet translation have remained elusive. Using RNA sequencing (RNA-Seq) and ribosome profiling of primary human platelets, we show the platelet transcriptome encompasses a subset of transcripts detected by RNA-Seq analysis of in vitro-derived MK cells and that these platelet-enriched transcripts are broadly occupied by ribosomes. We use RNA-Seq of synchronized populations of in vitro-derived platelet-like particles to show that mRNA decay strongly shapes the nascent platelet transcriptome. Our data suggest that the decay of platelet mRNAs is slowed by the natural loss of the mRNA surveillance and ribosome rescue factor Pelota.
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9
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Sellberg F, Berglund E, Ronaghi M, Strandberg G, Löf H, Sommar P, Lubenow N, Knutson F, Berglund D. Composition of growth factors and cytokines in lysates obtained from fresh versus stored pathogen-inactivated platelet units. Transfus Apher Sci 2016; 55:333-337. [DOI: 10.1016/j.transci.2016.08.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 08/29/2016] [Accepted: 08/30/2016] [Indexed: 12/22/2022]
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10
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Platelets miRNA as a Prediction Marker of Thrombotic Episodes. DISEASE MARKERS 2016; 2016:2872507. [PMID: 28042196 PMCID: PMC5155104 DOI: 10.1155/2016/2872507] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 10/04/2016] [Indexed: 11/18/2022]
Abstract
The blood platelets are crucial for the coagulation physiology to maintain haemostatic balance and are involved in various pathologies such as atherosclerosis and thrombosis. The studies of recent years have shown that anucleated platelets are able to succeed protein synthesis. Additionally, mRNA translation in blood platelets is regulated by miRNA molecules. Recent works postulate the possibility of using miRNAs as biomarkers of atherosclerosis and ischemic episodes. This review article describes clinical studies that presented blood platelets miRNAs expression profile changes in different thrombotic states, which suggest use of these molecules as predictive biomarkers.
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11
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Osman A, Hitzler WE, Provost P. Peculiarities of studying the effects of pathogen reduction technologies on platelets. Proteomics Clin Appl 2016; 10:805-15. [PMID: 27095411 DOI: 10.1002/prca.201500124] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 02/27/2016] [Accepted: 04/14/2016] [Indexed: 12/31/2022]
Abstract
The transfusion of platelet concentrates (PCs) is mainly used for treatment of thrombocytopenic, trauma or surgery patients. The integrity and safety of these platelet preparations, however, is compromised by the presence of pathogens, such as viruses, bacteria and parasites. The transfer of allogeneic donor leukocytes contaminating PCs can also potentially cause adverse reactions in recipients. These considerations prompted the development and implementation of pathogen reduction technologies (PRT), which are based on chemically induced cross-linking and inactivation of nucleic acids. While the incumbent PRT may provide some protection against transfusion-transmitted infections, they are ineffective against infectious prions and may not inactivate other emerging pathogens. In addition, the safety of PRT concerning platelet viability and function has been questioned in several reports. Recent studies suggest that PRT, such as Intercept, may adversely affect the messenger RNA (mRNA) and microRNA content of platelets, as well as their functional integrity, which may compromise the clinical benefits of PRT. Here, we will discuss about the peculiarities of studying the effects of PRT on platelets, which will need to be taken into account in future studies aimed to characterize further, and polish, the rugged side of this otherwise useful and potentially important approach in transfusion medicine.
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Affiliation(s)
- Abdimajid Osman
- Department of Clinical Chemistry, Region Östergötland, Linköping, Sweden.,Department of Clinical and Experimental Medicine, University of Linköping, Linköping, Sweden
| | - Walter E Hitzler
- Transfusion Center, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Patrick Provost
- CHUQ Research Center/CHUL, Quebec, QC, Canada.,Faculty of Medicine, Université Laval, Quebec, QC, Canada
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12
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The Emerging Role of miR-223 in Platelet Reactivity: Implications in Antiplatelet Therapy. BIOMED RESEARCH INTERNATIONAL 2015. [PMID: 26221610 PMCID: PMC4499381 DOI: 10.1155/2015/981841] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Platelets are anuclear cells and are devoid of genomic DNA, but they are capable of de novo protein synthesis from mRNA derived from their progenitor cells, megakaryocytes. There is mounting evidence that microRNA (miRNA) plays an important role in regulating gene expression in platelets. miR-223 is the most abundant miRNAs in megakaryocytes and platelets. One of the miR-223-regulated genes is ADP P2Y12, a key target for current antiplatelet drug therapy. Recent studies showed that a blunted response to P2Y12 antagonist, that is, high on-treatment platelet reactivity (HTPR), is a strong predictor of major cardiovascular events (MACEs) in coronary heart disease (CHD) patients receiving antiplatelet treatment. Recent clinical cohort study showed that the level of circulating miR-223 is inversely associated with MACE in CHD patients. In addition, our recent data demonstrated that the level of both intraplatelet and circulating miR-223 is an independent predictor for HTPR, thus providing a link between miR-223 and MACE. These lines of evidence indicate that miR-223 may serve as a potential regulatory target for HTPR, as well as a diagnostic tool for identification of HTPR in clinical settings.
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13
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Baaten CCFMJ, Veenstra LF, Wetzels R, van Geffen JP, Swieringa F, de Witt SM, Henskens YMC, Crijns H, Nylander S, van Giezen JJJ, Heemskerk JWM, van der Meijden PEJ. Gradual increase in thrombogenicity of juvenile platelets formed upon offset of prasugrel medication. Haematologica 2015; 100:1131-8. [PMID: 26113418 DOI: 10.3324/haematol.2014.122457] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 06/22/2015] [Indexed: 12/14/2022] Open
Abstract
In patients with acute coronary syndrome, dual antiplatelet therapy with aspirin and a P2Y12 inhibitor like prasugrel is prescribed for one year. Here, we investigated how the hemostatic function of platelets recovers after discontinuation of prasugrel treatment. Therefore, 16 patients who suffered from ST-elevation myocardial infarction were investigated. Patients were treated with aspirin (100 mg/day, long-term) and stopped taking prasugrel (10 mg/day) after one year. Blood was collected at the last day of prasugrel intake and at 1, 2, 5, 12 and 30 days later. Platelet function in response to ADP was normalized between five and 30 days after treatment cessation and in vitro addition of the reversible P2Y12 receptor antagonist ticagrelor fully suppressed the regained activation response. Discontinuation of prasugrel resulted in the formation of an emerging subpopulation of ADP-responsive platelets, exhibiting high expression of active integrin αIIbβ3. Two different mRNA probes, thiazole orange and the novel 5'Cy5-oligo-dT probe revealed that this subpopulation consisted of juvenile platelets, which progressively contributed to platelet aggregation and thrombus formation under flow. During offset, juvenile platelets were overall more reactive than older platelets. Interestingly, the responsiveness of both juvenile and older platelets increased in time, pointing towards a residual inhibitory effect of prasugrel on the megakaryocyte level. In conclusion, the gradual increase in thrombogenicity after cessation of prasugrel treatment is due to the increased activity of juvenile platelets.
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Affiliation(s)
- Constance C F M J Baaten
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
| | - Leo F Veenstra
- Department of Cardiology, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
| | - Rick Wetzels
- Central Diagnostic Laboratory, Maastricht University Medical Centre, The Netherlands
| | - Johanna P van Geffen
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
| | - Frauke Swieringa
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
| | - Susanne M de Witt
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
| | - Yvonne M C Henskens
- Central Diagnostic Laboratory, Maastricht University Medical Centre, The Netherlands
| | - Harry Crijns
- Department of Cardiology, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
| | | | | | - Johan W M Heemskerk
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
| | - Paola E J van der Meijden
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, The Netherlands
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14
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Platelet microparticles are internalized in neutrophils via the concerted activity of 12-lipoxygenase and secreted phospholipase A2-IIA. Proc Natl Acad Sci U S A 2015; 112:E3564-73. [PMID: 26106157 DOI: 10.1073/pnas.1507905112] [Citation(s) in RCA: 153] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Platelets are anucleated blood elements highly potent at generating extracellular vesicles (EVs) called microparticles (MPs). Whereas EVs are accepted as an important means of intercellular communication, the mechanisms underlying platelet MP internalization in recipient cells are poorly understood. Our lipidomic analyses identified 12(S)-hydroxyeicosatetranoic acid [12(S)-HETE] as the predominant eicosanoid generated by MPs. Mechanistically, 12(S)-HETE is produced through the concerted activity of secreted phospholipase A2 IIA (sPLA2-IIA), present in inflammatory fluids, and platelet-type 12-lipoxygenase (12-LO), expressed by platelet MPs. Platelet MPs convey an elaborate set of transcription factors and nucleic acids, and contain mitochondria. We observed that MPs and their cargo are internalized by activated neutrophils in the endomembrane system via 12(S)-HETE. Platelet MPs are found inside neutrophils isolated from the joints of arthritic patients, and are found in neutrophils only in the presence of sPLA2-IIA and 12-LO in an in vivo model of autoimmune inflammatory arthritis. Using a combination of genetically modified mice, we show that the coordinated action of sPLA2-IIA and 12-LO promotes inflammatory arthritis. These findings identify 12(S)-HETE as a trigger of platelet MP internalization by neutrophils, a mechanism highly relevant to inflammatory processes. Because sPLA2-IIA is induced during inflammation, and 12-LO expression is restricted mainly to platelets, these observations demonstrate that platelet MPs promote their internalization in recipient cells through highly regulated mechanisms.
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15
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Corduan A, Plé H, Laffont B, Wallon T, Plante I, Landry P, Provost P. Dissociation of SERPINE1 mRNA from the translational repressor proteins Ago2 and TIA-1 upon platelet activation. Thromb Haemost 2015; 113:1046-59. [PMID: 25673011 DOI: 10.1160/th14-07-0622] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 12/26/2014] [Indexed: 11/05/2022]
Abstract
Platelets play an important role in haemostasis, as well as in thrombosis and coagulation processes. They harbour a wide variety of messenger RNAs (mRNAs), that can template de novo protein synthesis, and an abundant array of microRNAs, which are known to mediate mRNA translational repression through proteins of the Argonaute (Ago) family. The relationship between platelet microRNAs and proteins capable of mediating translational repression, however, remains unclear. Here, we report that half of platelet microRNAs is associated to mRNA-regulatory Ago2 protein complexes, in various proportions. Associated to these Ago2 complexes are platelet mRNAs known to support de novo protein synthesis. Reporter gene activity assays confirmed the capacity of the platelet microRNAs, found to be associated to Ago2 complexes, to regulate translation of these platelet mRNAs through their 3'UTR. Neither the microRNA repertoire nor the microRNA composition of Ago2 complexes of human platelets changed upon activation with thrombin. However, under conditions favoring de novo synthesis of Plasminogen Activator Inhibitor-1 (PAI-1) protein, we documented a rapid dissociation of the encoding platelet SERPINE1 mRNA from Ago2 protein complexes as well as from the translational repressor protein T-cell-restricted intracellular antigen-1 (TIA-1). These findings are consistent with a scenario by which lifting of the repressive effects of Ago2 and TIA-1 protein complexes, involving a rearrangement of proteinmRNA complexes rather than disassembly of Ago2microRNA complexes, would allow translation of SERPINE1 mRNA into PAI-1 in response to platelet activation.
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Affiliation(s)
| | | | | | | | | | | | - Patrick Provost
- Dr. Patrick Provost, CHUQ Research Center/CHUL, 2705 Blvd Laurier, Room T1-65, Quebec, QC G1V 4G2, Canada, Tel.: +1 418 525 4444 (ext. 48842), E-mail:
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Schubert S, Weyrich AS, Rowley JW. A tour through the transcriptional landscape of platelets. Blood 2014; 124:493-502. [PMID: 24904119 PMCID: PMC4110657 DOI: 10.1182/blood-2014-04-512756] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 05/30/2014] [Indexed: 02/07/2023] Open
Abstract
The RNA code found within a platelet and alterations of that code continue to shed light onto the mechanistic underpinnings of platelet function and dysfunction. It is now known that features of messenger RNA (mRNA) in platelets mirror those of nucleated cells. This review serves as a tour guide for readers interested in developing a greater understanding of platelet mRNA. The tour provides an in-depth and interactive examination of platelet mRNA, especially in the context of next-generation RNA sequencing. At the end of the expedition, the reader will have a better grasp of the topography of platelet mRNA and how it impacts platelet function in health and disease.
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Affiliation(s)
| | - Andrew S Weyrich
- The Molecular Medicine Program and Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Jesse W Rowley
- The Molecular Medicine Program and Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT
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17
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Osman A, Hitzler WE, Meyer CU, Landry P, Corduan A, Laffont B, Boilard E, Hellstern P, Vamvakas EC, Provost P. Effects of pathogen reduction systems on platelet microRNAs, mRNAs, activation, and function. Platelets 2014; 26:154-63. [PMID: 24749844 PMCID: PMC4364275 DOI: 10.3109/09537104.2014.898178] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Pathogen reduction (PR) systems for platelets, based on chemically induced cross-linking and inactivation of nucleic acids, potentially prevent transfusion transmission of infectious agents, but can increase clinically significant bleeding in some clinical studies. Here, we documented the effects of PR systems on microRNA and mRNA levels of platelets stored in the blood bank, and assessed their impact on platelet activation and function. Unlike platelets subjected to gamma irradiation or stored in additive solution, platelets treated with Intercept (amotosalen + ultraviolet-A [UVA] light) exhibited significantly reduced levels of 6 of the 11 microRNAs, and 2 of the 3 anti-apoptotic mRNAs (Bcl-xl and Clusterin) that we monitored, compared with platelets stored in plasma. Mirasol (riboflavin + UVB light) treatment of platelets did not produce these effects. PR neither affected platelet microRNA synthesis or function nor induced cross-linking of microRNA-sized endogenous platelet RNA species. However, the reduction in the platelet microRNA levels induced by Intercept correlated with the platelet activation (p < 0.05) and an impaired platelet aggregation response to ADP (p < 0.05). These results suggest that Intercept treatment may induce platelet activation, resulting in the release of microRNAs and mRNAs from platelets. The clinical implications of this reduction in platelet nucleic acids secondary to Intercept remain to be established.
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Affiliation(s)
- Abdimajid Osman
- Division of Clinical Chemistry, Department of Clinical and Experimental Medicine, University of Linköping , Linköping , Sweden
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18
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Cattaneo M. Variability of platelet responses to adenosine diphosphate. Thromb Res 2013; 131:472-3. [DOI: 10.1016/j.thromres.2013.03.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 03/18/2013] [Accepted: 03/19/2013] [Indexed: 12/12/2022]
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19
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Plé H, Landry P, Benham A, Coarfa C, Gunaratne PH, Provost P. The repertoire and features of human platelet microRNAs. PLoS One 2012; 7:e50746. [PMID: 23226537 PMCID: PMC3514217 DOI: 10.1371/journal.pone.0050746] [Citation(s) in RCA: 160] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Accepted: 10/24/2012] [Indexed: 12/21/2022] Open
Abstract
Playing a central role in the maintenance of hemostasis as well as in thrombotic disorders, platelets contain a relatively diverse messenger RNA (mRNA) transcriptome as well as functional mRNA-regulatory microRNAs, suggesting that platelet mRNAs may be regulated by microRNAs. Here, we elucidated the complete repertoire and features of human platelet microRNAs by high-throughput sequencing. More than 492 different mature microRNAs were detected in human platelets, whereas the list of known human microRNAs was expanded further by the discovery of 40 novel microRNA sequences. As in nucleated cells, platelet microRNAs bear signs of post-transcriptional modifications, mainly terminal adenylation and uridylation. In vitro enzymatic assays demonstrated the ability of human platelets to uridylate microRNAs, which correlated with the presence of the uridyltransferase enzyme TUT4. We also detected numerous microRNA isoforms (isomiRs) resulting from imprecise Drosha and/or Dicer processing, in some cases more frequently than the reference microRNA sequence, including 5′ shifted isomiRs with redirected mRNA targeting abilities. This study unveils the existence of a relatively diverse and complex microRNA repertoire in human platelets, and represents a mandatory step towards elucidating the intraplatelet and extraplatelet role, function and importance of platelet microRNAs.
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Affiliation(s)
- Hélène Plé
- Centre hospitalier universitaire de Québec Research Center/Centre hospitalier de l'Université Laval, Quebec, Quebec, Canada, and Faculty of Medicine, Université Laval, Quebec, Quebec, Canada
| | - Patricia Landry
- Centre hospitalier universitaire de Québec Research Center/Centre hospitalier de l'Université Laval, Quebec, Quebec, Canada, and Faculty of Medicine, Université Laval, Quebec, Quebec, Canada
| | - Ashley Benham
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Cristian Coarfa
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
| | - Preethi H. Gunaratne
- Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America
- Department of Pathology, Baylor College of Medicine, Houston, Texas, United States of America
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas, United States of America
| | - Patrick Provost
- Centre hospitalier universitaire de Québec Research Center/Centre hospitalier de l'Université Laval, Quebec, Quebec, Canada, and Faculty of Medicine, Université Laval, Quebec, Quebec, Canada
- * E-mail:
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Plé H, Maltais M, Corduan A, Rousseau G, Madore F, Provost P. Alteration of the platelet transcriptome in chronic kidney disease. Thromb Haemost 2012; 108:605-15. [PMID: 22836280 DOI: 10.1160/th12-03-0153] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 06/12/2012] [Indexed: 11/05/2022]
Abstract
Bleeding and thrombotic disorders are major complications affecting patients with chronic kidney disease (CKD). Exposure of circulating platelets to uraemic toxins and contact with artificial surfaces during dialysis induce platelet abnormalities and alter the platelet proteome. We hypothesised that these changes may be subsequent to changes in the composition and/or regulation of the platelet transcriptome. In this study, we investigated the circulating platelets of 10 CKD patients (i.e. five chronic haemodialysis patients and five stage 4 CKD uraemic patients) and five age- and sex-matched healthy subjects. We observed an alteration of the platelet messenger RNA (mRNA) and microRNA transcriptome in CKD patients. Impaired in uraemic platelets, the levels of some mRNAs and of most microRNAs appeared to be corrected by dialysis, which is consistent with a beneficial effect of dialysis and a mRNA regulatory role of platelet microRNAs. Reduced in platelets of uraemic patients, phosphatidylcholine transfer protein (PCTP) and WD repeat-containing protein 1 (WDR1) were found to be regulated by microRNAs, the latter of which involving hsa-miR-19b, a microRNA increased in platelets of uraemic patients and involved in platelet reactivity. These results suggest that an alteration of microRNA-based mRNA regulatory mechanisms may underlie the platelet response to uremia and entail the development of platelet-related complications in CKD.
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Affiliation(s)
- Hélène Plé
- CHUQ Research Center/CHUL, Quebec, Quebec, Canada
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21
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Schubert P, Devine DV. De novo protein synthesis in mature platelets: a consideration for transfusion medicine. Vox Sang 2010; 99:112-22. [PMID: 20345520 DOI: 10.1111/j.1423-0410.2010.01333.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Platelet function in thrombosis and haemostasis is reasonably well understood at the molecular level with respect to the proteins involved in cellular structure, signalling networks and platelet interaction with clotting factors and other cells. However, the natural history of these proteins has only recently garnered the attention of platelet researchers. De novo protein synthesis in platelets was discovered 40 years ago; however, it was generally dismissed as merely an interesting minor phenomenon until studies over the past few years renewed interest in this aspect of platelet proteins. It is now accepted that anucleate platelets not only have the potential to synthesize proteins, but this capacity seems to be required to fulfil their function. With translational control as the primary mode of regulation, platelets are able to express biologically relevant gene products in a timely and signal-dependent manner. Platelet protein synthesis during storage of platelet concentrates is a nascent area of research. Protein synthesis does occur, although not for all proteins found in the platelet protein profile. Furthermore, mRNA appears to be well preserved under standard storage conditions. Although its significance is not yet understood, the ability to replace proteins may form a type of cellular repair mechanism during storage. Disruption by inappropriate storage conditions or processes that block protein synthesis such as pathogen reduction technologies may have direct effects on the ability of platelets to synthesize proteins during storage.
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Affiliation(s)
- P Schubert
- Canadian Blood Services and the Centre for Blood Research, University of British Columbia, Vancouver, BC, Canada
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22
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Abstract
Although mammalian platelets are anucleated cells, a number of studies have shown that they retain a pool of messenger RNA (mRNA) carried over from the megakaryocyte during thrombopoiesis. Platelet mRNA was originally thought to be relatively unstable and short-lived within the youngest cells and has been used as a potential marker of platelet turnover. In this article we will discuss both theoretical and methodological issues related to the measurement of these younger, "reticulated platelets". A key question relating to platelet mRNA is also whether it has any functional relevance other than a marker of platelet immaturity. Evidence going back more than 30 years suggests that platelets can biosynthesize proteins. However, it is only very recently that the nature and specificity of platelet mRNA has been examined in any detail. Difficulties in obtaining pure platelet mRNA, free of contamination from other cells has added to the complexity of unravelling this story. However, there is now clear evidence that platelets contain small but significant levels of message for a variety of proteins. The platelet mRNA pool is much richer and more diverse than previously thought and recent data suggests that regulated synthesis of a selected number of proteins can be induced on platelet activation. The full complexity of the platelet genome is now just being revealed and may open the possibility for improved diagnosis and therapy of many haemostatic and thrombotic disorders.
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Affiliation(s)
- Paul Harrison
- Oxford Haemophilia and Thrombosis Centre, Churchill Hospital, Oxford, UK.
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23
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Landry P, Plante I, Ouellet DL, Perron MP, Rousseau G, Provost P. Existence of a microRNA pathway in anucleate platelets. Nat Struct Mol Biol 2009; 16:961-6. [PMID: 19668211 DOI: 10.1038/nsmb.1651] [Citation(s) in RCA: 365] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2009] [Accepted: 07/02/2009] [Indexed: 12/15/2022]
Abstract
Platelets have a crucial role in the maintenance of hemostasis as well as in thrombosis and vessel occlusion, which underlie stroke and acute coronary syndromes. Anucleate platelets contain mRNAs and are capable of protein synthesis, raising the issue of how these mRNAs are regulated. Here we show that human platelets harbor an abundant and diverse array of microRNAs (miRNAs), which are known as key regulators of mRNA translation in other cell types. Further analyses revealed that platelets contain the Dicer and Argonaute 2 (Ago2) complexes, which function in the processing of exogenous miRNA precursors and the control of specific reporter transcripts, respectively. Detection of the receptor P2Y(12) mRNA in Ago2 immunoprecipitates suggests that P2Y(12) expression may be subjected to miRNA control in human platelets. Our study lends an additional level of complexity to the control of gene expression in these anucleate elements of the cardiovascular system.
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Affiliation(s)
- Patricia Landry
- Centre de Recherche en Rhumatologie et Immunologie, CHUL Research Center/CHUQ, and Faculty of Medicine, Université Laval, Quebec, Quebec, Canada
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24
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Springer DL, Miller JH, Spinelli SL, Pasa-Tolic L, Purvine SO, Daly DS, Zangar RC, Jin S, Blumberg N, Francis CW, Taubman MB, Casey AE, Wittlin SD, Phipps RP. Platelet proteome changes associated with diabetes and during platelet storage for transfusion. J Proteome Res 2009; 8:2261-72. [PMID: 19267493 DOI: 10.1021/pr800885j] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Human platelets play a key role in hemostasis and thrombosis and have recently emerged as key regulators of inflammation. Platelets stored for transfusion produce pro-thrombotic and pro-inflammatory mediators implicated in adverse transfusion reactions. Correspondingly, these mediators are central players in pathological conditions including cardiovascular disease, the major cause of death in diabetics. In view of this, a mass spectrometry based proteomics study was performed on platelets collected from healthy and type-2 diabetics stored for transfusion. Strikingly, our innovative and sensitive proteomic approach identified 122 proteins that were either up- or down-regulated in type-2 diabetics relative to nondiabetic controls and 117 proteins whose abundances changed during a 5-day storage period. Notably, our studies are the first to characterize the proteome of platelets from diabetics before and after storage for transfusion. These identified differences allow us to formulate new hypotheses and experimentation to improve clinical outcomes by targeting "high risk platelets" that render platelet transfusion less effective or even unsafe.
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Affiliation(s)
- David L Springer
- Fundamental Science Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland Washington 99352, USA.
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25
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Thon JN, Schubert P, Devine DV. Platelet storage lesion: a new understanding from a proteomic perspective. Transfus Med Rev 2008; 22:268-79. [PMID: 18848154 DOI: 10.1016/j.tmrv.2008.05.004] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Platelet storage and availability for the purposes of transfusion are currently restricted by a markedly short shelf life of 5 to 7 days owing to an increased risk of bacterial growth and storage-related deterioration called the platelet storage lesion. Because most bacteria grow to confluence within 5 days during storage at room temperature, there is little increased risk of bacterial overgrowth with testing in place, and the only remaining issue is the quality of platelets during the extended storage. Although the manifestations of the storage lesion have been well studied using a variety of in vitro measures, the precise biochemical pathways involved in the initiation and progression of this process have yet to be identified. Proteomics has emerged as a powerful tool to identify and monitor changes during platelet storage and, in combination with biochemical and physiologic studies, facilitates the development of a sophisticated mechanistic view. In this review, we summarize recent experimental work that has led to a detailed overview of protein changes linked to platelet functions and signaling pathways, providing potential targets for inhibitors to ameliorate the storage lesion.
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26
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Zimmerman GA, Weyrich AS. Signal-dependent protein synthesis by activated platelets: new pathways to altered phenotype and function. Arterioscler Thromb Vasc Biol 2008; 28:s17-24. [PMID: 18296586 DOI: 10.1161/atvbaha.107.160218] [Citation(s) in RCA: 144] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
New biologic activities of platelets continue to be discovered, indicating that concepts of platelet function in hemostasis, thrombosis, and inflammation require reconsideration as new paradigms evolve. Studies done over 3 decades ago demonstrated that mature circulating platelets have protein synthetic capacity, but it was thought to be low level and inconsequential. In contrast, recent discoveries demonstrate that platelets synthesize protein products with important biologic activities in a rapid and sustained fashion in response to cellular activation. This process, termed signal-dependent translation, uses a constitutive transcriptome and specialized pathways, and can alter platelet phenotype and functions in a fashion that can have clinical relevance. Signal-dependent translation and consequent protein synthesis are examples of a diverse group of posttranscriptural mechanisms in activated platelets that are now being revealed.
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Affiliation(s)
- Guy A Zimmerman
- Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT 84132, USA.
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Abstract
BACKGROUND Platelet (PLT) products have a short shelf life (5 days) owing in part to the deterioration of the quality of PLTs stored at 22 degrees C. This creates significant inventory challenges, and blood banks may suffer shortages and high wastage as a result. The precise biochemical pathways involved in the PLT storage lesion are unknown and must be understood before storage time can be extended. STUDY DESIGN AND METHODS Informed by previous proteomics analysis, specific PLT glycoprotein (GP) concentration and surface expression were examined by Western blot and flow cytometry. mRNA concentration was determined by Northern blot and real-time polymerase chain reaction. Protein synthesis was confirmed by [(35)S]methionine labeling. RESULTS Western blots of GPIIIa revealed a twofold increase in concentration on Day 7 of storage and a fourfold increase on Day 10. By flow cytometry, surface expression of the GPIIb/IIIa increased by 13.4 percent on Day 7 and 41.9 percent on Day 10. Full-length GPIIIa mRNA was present throughout this storage period and was shown to have a half-life of approximately 2.9 days. Translation of GPIIb and IIIa during storage was confirmed by [(35)S]methionine labeling. CONCLUSION This article confirms that PLTs are capable of synthesizing biologically relevant proteins ex vivo throughout a 10-day storage period with particularly long-lived mRNA and provides a framework through which the biochemical mechanisms involved in the translational regulation of proteins thought to be involved in the initiation or exacerbation of the PLT storage lesion can be investigated.
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Affiliation(s)
- Jonathan N Thon
- Department of Biochemistry and Molecular Biology and the Center of Blood Research, University of British Columbia, Canada
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28
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Weyrich AS, Denis MM, Schwertz H, Tolley ND, Foulks J, Spencer E, Kraiss LW, Albertine KH, McIntyre TM, Zimmerman GA. mTOR-dependent synthesis of Bcl-3 controls the retraction of fibrin clots by activated human platelets. Blood 2006; 109:1975-83. [PMID: 17110454 PMCID: PMC1801071 DOI: 10.1182/blood-2006-08-042192] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
New activities of human platelets continue to emerge. One unexpected response is new synthesis of proteins from previously transcribed RNAs in response to activating signals. We previously reported that activated human platelets synthesize B-cell lymphoma-3 (Bcl-3) under translational control by mammalian target of rapamycin (mTOR). Characterization of the ontogeny and distribution of the mTOR signaling pathway in CD34+ stem cell-derived megakaryocytes now demonstrates that they transfer this regulatory system to developing proplatelets. We also found that Bcl-3 is required for condensation of fibrin by activated platelets, demonstrating functional significance for mTOR-regulated synthesis of the protein. Inhibition of mTOR by rapamycin blocks clot retraction by human platelets. Platelets from wild-type mice synthesize Bcl-3 in response to activation, as do human platelets, and platelets from mice with targeted deletion of Bcl-3 have defective retraction of fibrin in platelet-fibrin clots mimicking treatment of human platelets with rapamycin. In contrast, overexpression of Bcl-3 in a surrogate cell line enhanced clot retraction. These studies identify new features of post-transcriptional gene regulation and signal-dependant protein synthesis in activated platelets that may contribute to thrombus and wound remodeling and suggest that posttranscriptional pathways are targets for molecular intervention in thrombotic disorders.
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Affiliation(s)
- Andrew S Weyrich
- Department of Internal Medicine, Eccles Institute of Human Genetics, University of Utah, Salt Lake City, UT 84112, USA
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29
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Hillmann AG, Harmon S, Park SDE, O'brien J, Shields DC, Kenny D. Comparative RNA expression analyses from small-scale, single-donor platelet samples. J Thromb Haemost 2006; 4:349-56. [PMID: 16420564 DOI: 10.1111/j.1538-7836.2006.01684.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND Comparisons of platelet RNAs could provide crucial information on platelet function, thrombopoiesis and the etiology of megakaryocyte (MK) or platelet disorders. OBJECTIVES We developed a method for stringent purification of platelets from small blood samples from single donors. Purity of the platelet preparations was verified by an RT-PCR assay. We tested three methods to identify the differences in RNA between platelet sources. METHODS Differential hybridization to cDNA macro-arrays and suppressive-subtractive hybridization PCR (SSH-PCR) were used to compare RNAs from normal platelets to those from a Bernard-Soulier syndrome (BSS) patient. Affymetrix GeneChip U133 plus 2.0 arrays were used to compare male and female platelet RNAs. RESULTS Macroarrays identified approximately 7500 platelet transcripts, but failed to identify differentially expressed transcripts with confidence. SSH-PCR produced libraries almost exclusively of mitochondrial-derived transcripts, but included nuclear-encoded genes that could not be confirmed by immunoblotting of normal and BSS platelet lysates. The Affymetrix platform gave reproducible profiles from our small-scale purified platelet preparations, whereas a partially purified platelet preparation produced a drastically skewed transcript profile. The microarray analysis identified the heparanase precursor transcript as overexpressed in female platelets, and we observed variable yet consistently higher levels of heparanase protein in female platelets compared with male platelets in four independent donor pairs. CONCLUSIONS This demonstrates for the first time that differential platelet transcript levels can identify changes in expression level of platelet proteins. Combined with our small-scale platelet preparation method, this establishes a system to compare platelets from the limited clinical sources to help elucidate molecular bases for platelet or megakaryocyte pathologies.
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Affiliation(s)
- A G Hillmann
- Regenerative Medicine Institute, National University of Ireland, Galway, Ireland
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30
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Ficko T, Cernelc P. Real-time quantitative PCR assay for analysis of platelet glycoprotein IIIa gene expression. ACTA ACUST UNITED AC 2005; 62:241-50. [PMID: 15733584 DOI: 10.1016/j.jbbm.2004.12.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2004] [Revised: 11/26/2004] [Accepted: 12/05/2004] [Indexed: 11/25/2022]
Abstract
A quantitative detection assay for analysis of platelet glycoprotein GPIIIa gene expression is presented. The assay uses two fluorescently labeled TaqMan MGB probes to detect the polymorphic site in GPIIIa nucleotide sequence, leading to antigens HPA-1a and HPA-1b. In order to avoid the influence of DNA contamination on RNA quantification, a forward primer was constructed to span an exon-exon junction. The assay is therefore applicable to expression studies also in samples containing only a small amount of contaminating DNA. To standardize the amount of sample cDNA added to the reaction, amplification of endogenous control 18SrRNA was included in a separate well. The amplification validation experiment showed a high real-time PCR efficiency for HPA-1a, HPA-1b and 18SrRNA. Relative quantification was therefore performed using the comparative C(T) method. The assay was optimized on a reversely transcribed total RNA from platelets, and the specificity rate was determined by sequencing. The amount of cDNA at which amplification was still clearly detectable was 5 ng. This newly developed real-time quantitative PCR assay is a sensitive, reproducible and reliable method. It is suitable for studying different stages of megakaryopoiesis, monitoring molecular alteration in defective platelets and determining differences in the GPIIIa expression level between normal and pathological megakaryocytic differentiation pathways.
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Affiliation(s)
- Tanja Ficko
- Department of Microbiology, Lek Pharmaceuticals d.d., Ljubljana, Slovenia.
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31
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Queen LR, Ji Y, Goubareva I, Ferro A. Nitric oxide generation mediated by beta-adrenoceptors is impaired in platelets from patients with Type 2 diabetes mellitus. Diabetologia 2003; 46:1474-82. [PMID: 14574451 DOI: 10.1007/s00125-003-1219-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2003] [Revised: 06/30/2003] [Indexed: 11/27/2022]
Abstract
AIMS/HYPOTHESIS Type 2 diabetic patients have been shown to have reduced basal platelet nitric oxide synthase activity, which is a possible contributor to the vascular complications seen in the disease. We investigated platelet nitric oxide generation stimulated by beta-adrenoceptors and adenylyl cyclase in Type 2 diabetic patients and control subjects. METHODS Platelets isolated from blood taken from nine Type 2 diabetic patients and nine healthy control subjects of similar age were treated with isoproterenol 1 micro mol/l, forskolin 1 micro mol/l or vehicle. Platelet nitric oxide synthase activity was measured by L-[(3)H]-arginine to L-[(3)H]-citrulline conversion, cyclic GMP content by radioimmunoassay, and nitric oxide synthase type 3 expression by western blotting. RESULTS Basal platelet nitric oxide synthase activity was lower in diabetic patients than in control subjects (0.01+/-0.02 pmol L-citrulline/10(8) platelets, compared with 0.12+/-0.05; p<0.05), although no corresponding difference was seen in basal platelet cyclic GMP (0.61+/-0.39 and 0.13+/-0.22 pmol cyclic GMP/10(8) platelets respectively; p=0.37). In control subjects isoproterenol 1 micro mol/l and forskolin 1 micro mol/l increased platelet nitric oxide synthase activity (to 0.27+/-0.08 and 0.27+/-0.07 pmol L-citrulline/10(8) platelets respectively; p<0.05 for each in comparison with basal) and cyclic GMP (to 1.84+/-0.41 and 1.86+/-0.48; p<0.05 for each in comparison with basal). This effect was not achieved in diabetic patients. Isoproterenol- and forskolin-stimulated cyclic GMP correlated inversely with plasma glucose and HbA(1c). Platelet nitric oxide synthase type 3 expression was not different in control and diabetic subjects and was not changed by acute exposure of platelets to isoproterenol. CONCLUSIONS/INTERPRETATION Nitric oxide generation stimulated by beta-adrenoceptors and adenylyl cyclase is impaired in platelets of people with Type 2 diabetes mellitus, with no corresponding change in nitric oxide synthase type 3 expression. It is possible that this impairment contributes to the thrombotic and atherosclerotic complications of Type 2 diabetes.
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Affiliation(s)
- L R Queen
- GKT School of Medicine (Cardiovascular Division), King's College London, London, UK.
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Lindemann S, Tolley ND, Eyre JR, Kraiss LW, Mahoney TM, Weyrich AS. Integrins regulate the intracellular distribution of eukaryotic initiation factor 4E in platelets. A checkpoint for translational control. J Biol Chem 2001; 276:33947-51. [PMID: 11431478 DOI: 10.1074/jbc.m104281200] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Recent evidence from our laboratory demonstrates that platelets synthesize numerous proteins in a signal-dependent fashion (Pabla, R., Weyrich, A. S., Dixon, D. A., Bray, P. F., McIntyre, T. M., Prescott, S. M., and Zimmerman, G. A. (1999) J. Cell Biol. 144, 175-184; Weyrich, A. S., Dixon, D. A., Pabla, R., Elstad, M. R., McIntyre, T. M., Prescott, S. M., and Zimmerman, G. A. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 5556-5561). Protein synthesis in platelets is controlled at the translational level; however, the mechanisms of regulation are not known. Here we demonstrate that translation initiation factors are redistributed to mRNA-rich areas in aggregated platelets, an event that induces protein synthesis. Interrogation of cDNA arrays revealed that platelet-derived mRNAs are primarily associated with the cytoskeletal core. In contrast, eukaryotic initiation factor 4E (eIF4E), the essential mRNA cap-binding protein that controls global translation rates, is localized in the membrane skeleton and soluble fraction of platelets, physically separated from most mRNAs. Platelet activation redistributes eIF4E to the cytoskeleton and increases interactions of eIF4E with mRNA cap structures. Redistribution of eIF4E to the mRNA-rich cytoskeleton coincides with a marked increase in protein synthesis, a process that is blocked when intracellular actin is disrupted. Additional studies demonstrated that beta(3) integrins are the primary membrane receptor that distributes eIF4E within the cell. These results imply that integrins link receptor-mediated pathways with mRNA-rich cytoskeletal domains and thereby modulate the organization of intracellular translational complexes. They also indicate that the functional status of eIF4E is regulated by its intracellular distribution.
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Affiliation(s)
- S Lindemann
- Eccles Program in Human Biology and Genetics and the Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
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Pabla R, Weyrich AS, Dixon DA, Bray PF, McIntyre TM, Prescott SM, Zimmerman GA. Integrin-dependent control of translation: engagement of integrin alphaIIbbeta3 regulates synthesis of proteins in activated human platelets. J Cell Biol 1999; 144:175-84. [PMID: 9885253 PMCID: PMC2148114 DOI: 10.1083/jcb.144.1.175] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/1998] [Revised: 11/24/1998] [Indexed: 11/22/2022] Open
Abstract
Integrins are widely expressed plasma membrane adhesion molecules that tether cells to matrix proteins and to one another in cell-cell interactions. Integrins also transmit outside-in signals that regulate functional responses of cells, and are known to influence gene expression by regulating transcription. In previous studies we found that platelets, which are naturally occurring anucleate cytoplasts, translate preformed mRNA transcripts when they are activated by outside-in signals. Using strategies that interrupt engagement of integrin alphaIIbbeta3 by fibrinogen and platelets deficient in this integrin, we found that alphaIIbbeta3 regulates the synthesis of B cell lymphoma 3 (Bcl-3) when platelet aggregation is induced by thrombin. We also found that synthesis of Bcl-3, which occurs via a specialized translation control pathway regulated by mammalian target of rapamycin (mTOR), is induced when platelets adhere to immobilized fibrinogen in the absence of thrombin and when integrin alphaIIbbeta3 is engaged by a conformation-altering antibody against integrin alphaIIbbeta3. Thus, outside-in signals delivered by integrin alphaIIbbeta3 are required for translation of Bcl-3 in thrombin-stimulated aggregated platelets and are sufficient to induce translation of this marker protein in the absence of thrombin. Engagement of integrin alpha2beta1 by collagen also triggered synthesis of Bcl-3. Thus, control of translation may be a general mechanism by which surface adhesion molecules regulate gene expression.
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Affiliation(s)
- R Pabla
- Nora Eccles Harrison Cardiovascular Research and Training Institute, Eccles Institute of Human Genetics
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Oleksowicz L, Dutcher JP, Deleon-Fernandez M, Paietta E, Etkind P. Human breast carcinoma cells synthesize a protein immunorelated to platelet glycoprotein-Ib alpha with different functional properties. THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE 1997; 129:337-46. [PMID: 9042819 DOI: 10.1016/s0022-2143(97)90182-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Although tumor cell-induced platelet aggregation is thought to mediate an early step in the metastatic process, little is known about tumor adhesive receptors responsible for the initial platelet-tumor attachments. Because our preliminary work demonstrated that a platelet-immunorelated glycoprotein Ib alpha (GPIb alpha) receptor expressed by the human breast carcinoma cell line MCF-7 participates in tumor-induced platelet aggregation, we examined the synthesis and functional characteristics of this MCF-7-immunorelated GPIb alpha. When 35S-cysteine-labeled, digitonin-lysed MCF-7 cells were immunoprecipitated with platelet-specific monoclonal antibodies (mAbs) to GPIb alpha, major radioactive bands were observed. Northern blots showed MCF-7 transcripts for GPIb alpha under both high- and low-stringency hybridization conditions. In the presence of purified human iodine 125-labeled von Willebrand factor (125I-labeled vWf) with or without the addition of ristocetin, unlabeled vWf was observed to competitively bind to fixed MCF-7 cells (50% inhibitory concentration = 10 microg/ml, dissociation constant = approximately 3.8 +/- 1.9 nmol/L, 2.7 x 106 + 445,000 binding sites/cell) in which non-GPIb alpha vWf binding sites were blocked. 125I-vWf binding to blocked MCF-7 cells could be selectively and completely inhibited by mAbs specific for the vWf binding domain of GPIb alpha but not by mAbs against the GPIX subunit, the GPIb alpha subunit, or alternate GPIb alpha epitopes other than the vWf-binding domain. Finally, when whole blood substrate was incubated with a mAb specific for the GPIb binding epitope of vWf, MCF-7-induced platelet aggregation was virtually abolished in comparison with control specimens (N = 8; p < 0.0009). These findings (1) confirm the synthesis and expression of an MCF-7 protein with homology to platelet GPIb alpha, (2) confirm that the functional activity of this MCF-7-immunorelated GPIb alpha differs from that of platelet GPIb alpha, and (3) suggest that MCF-7-immunorelated GPIb alpha in its adhesive interactions with plasma vWf may constitute an initial event in MCF-7-induced platelet aggregation.
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Affiliation(s)
- L Oleksowicz
- Department of Oncology, Montefiore Medical Center Hospital, Albert Einstein College of Medicine, Bronx, New York 10467, USA
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35
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Houng AK, Maggini L, Clement CY, Reed GL. Identification and structure of activated-platelet protein-1, a protein with RNA-binding domain motifs that is expressed by activated platelets. EUROPEAN JOURNAL OF BIOCHEMISTRY 1997; 243:209-18. [PMID: 9030741 DOI: 10.1111/j.1432-1033.1997.0209a.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Beyond their critical role in thrombosis, platelets perform important functions in vascular remodeling, inflammation, and wound repair. Many of these functions are executed by molecules expressed by activated platelets. A novel molecule, activated-platelet protein-1 (APP-1), was identified by a monoclonal antibody against activated rabbit platelets. When platelets were stimulated by thrombin, A23187 or ADP, APP-I was expressed on the platelet surface. APP-1 was also detected in whole cell lysates of platelets, but not on the external surfaces of resting platelets. With maximal activation by thrombin, 15 900 +/- 2800 molecules APP-1 were expressed/platelet. A 2.3-kb cDNA fragment containing a partial coding sequence for APP-1 was isolated from a rabbit bone marrow library by expression cloning with the anti-APP-1 monoclonal antibody. When expressed as a recombinant fusion protein in bacteria, APP-1 bound specifically to poly(A)-Sepharose. The full-length cDNA coding for human APP-1, obtained by DNA hybridization techniques, showed 98.7% amino acid sequence identity with the rabbit protein. Northern analysis with human APP-1 identified a 3.7-kb mRNA transcript in megakaryocytic lines that express transcripts for platelet proteins. Human APP-1 has four ribonucleotide binding domains with ribonucleoprotein 1 and 2 motifs. By virtue of its ribonucleotide binding domains, APP-1 is structurally related to polyadenylate-binding protein, which regulates translation initiation and polyadenylate shortening, and to nucleolysin, a specific effector molecule found in the granules of cytotoxic T lymphocytes.
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Affiliation(s)
- A K Houng
- Cardiovascular Biology Laboratory, Harvard School of Public Health, Boston, MA 02115, USA
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36
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Chen LY, Mehta P, Mehta JL. Oxidized LDL decreases L-arginine uptake and nitric oxide synthase protein expression in human platelets: relevance of the effect of oxidized LDL on platelet function. Circulation 1996; 93:1740-6. [PMID: 8653881 DOI: 10.1161/01.cir.93.9.1740] [Citation(s) in RCA: 109] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Oxidized LDL (ox-LDL) promotes vasoconstriction and platelet activation. The present study was undertaken to determine the involvement of the L-arginine-nitric oxide (NO) pathway in ox-LDL-mediated platelet activation. METHODS AND RESULTS Washed human platelets were incubated with native LDL or ox-LDL for 1 hour at 37 degrees C followed by measurement of platelet function and indexes of the L-arginine-NO pathway. Ox-LDL but not native LDL caused a concentration-dependent increase in thrombin-induced platelet aggregation and 14C-serotonin release. These effects of ox-LDL were inhibited by pretreatment of platelets with L-arginine, the precursor of NO. Ox-LDL also caused a concentration-dependent reduction in the uptake of 3H-L-arginine by platelets. In addition, NO synthase activity, measured as conversion of 3H-L-arginine to 3H-L-citrulline, decreased on incubation of platelet cytosol with ox-LDL. Nitrite production was also reduced by treatment of platelets with ox-LDL. These effects of ox-LDL on NO synthase activity and nitrite production were reversed by pretreatment of platelets with L-arginine. Concurrent with the decrease in NO production, cytosolic cGMP was inhibited in ox-LDL-treated platelets. The inhibitory effects of ox-LDL were dependent in part on the increase of cholesterol in the platelets. Western blot analysis demonstrated approximately 50% reduction in the expression of NO synthase protein in platelets treated with ox-LDL. CONCLUSIONS These observations indicate that the L-arginine-NO pathway is involved in the effects of ox-LDL on platelet function and that ox-LDL stimulates platelet function primarily by diminishing NO synthase expression as well as decreasing the uptake of L-arginine.
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Affiliation(s)
- L Y Chen
- Department of Medicine, College of Medicine, University of Florida, Gainesville, USA
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Mehta JL, Chen LY. Reversal by high-density lipoprotein of the effect of oxidized low-density lipoprotein on nitric oxide synthase protein expression in human platelets. THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE 1996; 127:287-95. [PMID: 9273362 DOI: 10.1016/s0022-2143(96)90097-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Oxidized low-density lipoproteins (ox-LDLs) induce vasoconstriction and platelet activation, and high-density lipoproteins (HDLs) reverse these effects of ox-LDL. To determine the involvement of the L-arginine-nitric oxide (NO) pathway in the effects of lipoproteins on platelets, washed human platelets were incubated with native-LDL, ox-LDL, or HDL plus ox-LDL, but not native LDL, potentiated thrombin-induced platelet aggregation and carbon 14-labeled serotonin release, and these effects of ox-LDL were blocked by pretreatment of platelets with HDL. Incubation of ox-LDL with platelets resulted in reduction in the uptake of tritiated L-arginine by intact platelets and in NO synthase activity in platelet lysate. These effects of ox-LDL on platelet NO synthase activity were also reversed by pretreatment of platelets with HDL. Western blot analysis demonstrated about a 50% reduction in the expression of NO synthase protein in platelets treated with ox-LDL. Whereas HDL alone had no effect on NO synthase protein expression, it blocked the decrease in NO synthase expression caused by ox-LDL. Thus ox-LDL stimulates platelet function primarily by diminishing NO synthase expression, and this effect of ox-LDL can be blocked by pretreatment of platelets with HDL.
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Affiliation(s)
- J L Mehta
- Department of Medicine, Colege of Medicine, University of Florida, Gainesville 32610-0277, USA
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38
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Chen LY, Mehta JL. Further evidence of the presence of constitutive and inducible nitric oxide synthase isoforms in human platelets. J Cardiovasc Pharmacol 1996; 27:154-8. [PMID: 8656650 DOI: 10.1097/00005344-199601000-00024] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Previous studies have suggested the presence of nitric oxide synthase (NOS) enzyme in human platelets. We herein provide definitive evidence for the presence of both endothelial constitutive NOS (ecNOS) and inducible NOS (iNOS) isoforms and their mRNA in human platelets. Total RNA was isolated from human platelets, and reverse-transcription polymerase chain reaction (RT-PCR) demonstrated the expression of the ecNOS and iNOS isoforms in platelets. High-stringency Southern analysis confirmed the molecular authenticity of the RT-PCR products for each NOS isoform. Western analysis with mouse monoclonal antibody against human ecNOS consistently demonstrated a band with a molecular weight of 140-150 kDa. Western analysis with mouse monoclonal antibody against rat macrophage iNOS showed a single 200-kDa band in both resting and lipopolysaccharide (LPS)-plus interferon-gamma (IFN-gamma)-stimulated platelets. Immunoprecipitation further confirmed the presence of the 200-kDa iNOS band. Expression of iNOS protein, measured with densitometry, was increased in LPS- and IFN-gamma-stimulated platelets (p < 0.01 vs. resting platelets). Thus, human platelets possess both ecNOS and iNOS isoforms and their mRNA, and iNOS exhibits molecular weight and kinetic characteristics distinct from those of ecNOS.
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Affiliation(s)
- L Y Chen
- Department of Medicine, University of Florida College of Medicine, Gainesville 32610-0277, USA
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39
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Structural characterization and chromosomal location of the gene encoding human platelet glycoprotein Ib beta. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32456-0] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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40
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Kelly MD, Essex DW, Shapiro SS, Meloni FJ, Druck T, Huebner K, Konkle BA. Complementary DNA cloning of the alternatively expressed endothelial cell glycoprotein Ib beta (GPIb beta) and localization of the GPIb beta gene to chromosome 22. J Clin Invest 1994; 93:2417-24. [PMID: 8200976 PMCID: PMC294449 DOI: 10.1172/jci117249] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Glycoprotein Ib beta (GPIb beta) exists in platelets disulfide-linked to glycoprotein Ib alpha (GPIb alpha), a major receptor for von Willebrand factor. Both GPIb alpha and GPIb beta are expressed in endothelial cells (EC). While the GPIb alpha mRNA and protein appear similar in platelets and EC, EC GPIb beta mRNA is larger than platelet GPIb beta and encodes a larger protein. We have cloned and sequenced EC GPIb beta cDNA and report a 2793-nucleotide sequence which contains a 411-amino acid open reading frame. The EC sequence contains all of the platelet cDNA sequence and all but three amino acids of the primary translation product. Like the genes encoding GPIb alpha, GPIX, and GPV, the GPIb beta gene appears simple in structure. Using human hamster hybrids, we have localized the GPIb beta gene to chromosome 22pter-->22q11.2. When we examined poly (A)+ RNA from several human tissues for GPIb beta mRNA expression, we found that GPIb beta mRNA was expressed in a variety of tissues but was most abundant in heart and brain, while GPIb alpha and GPIX mRNA expression was found only in lung and placenta at very low levels. The broad distribution of GPIb beta mRNA suggests that it may be playing a role different than or additional to its function in platelets.
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Affiliation(s)
- M D Kelly
- Cardeza Foundation for Hematologic Research, Department of Medicine, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
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41
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Bobe R, Bredoux R, Wuytack F, Quarck R, Kovàcs T, Papp B, Corvazier E, Magnier C, Enouf J. The rat platelet 97-kDa Ca2+ATPase isoform is the sarcoendoplasmic reticulum Ca2+ATPase 3 protein. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)42274-5] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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42
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Hickey MJ, Hagen FS, Yagi M, Roth GJ. Human platelet glycoprotein V: characterization of the polypeptide and the related Ib-V-IX receptor system of adhesive, leucine-rich glycoproteins. Proc Natl Acad Sci U S A 1993; 90:8327-31. [PMID: 7690959 PMCID: PMC47349 DOI: 10.1073/pnas.90.18.8327] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Human platelet glycoprotein (GP) V (M(r) 83,300), whose primary structure is reported here, is a part of the Ib-V-IX system of surface glycoproteins (GPs Ib alpha, Ib beta, V, IX) that constitute the receptor for von Willebrand factor (vWf) and mediate the adhesion of platelets to injured vascular surfaces in the arterial circulation, a critical initiating event in hemostasis. System members share physical associations, leucine-rich glycoprotein (LRG) structures, and a congenital deficiency state, Bernard-Soulier syndrome. With PCR techniques and platelet cDNA templates, 1.4 kb of GP V cDNA sequence was obtained that encodes 469 GP V amino acids. A genomic 3.5-kb BamHI fragment was then isolated that includes 3.46 kb of GP V cDNA sequence: the 1.7-kb open reading frame plus 2 bases of the 5' and 1.8 kb of the 3' untranslated regions. Northern blot analysis reveals three GP V platelet transcripts of 3.8, 4.2, and 5.2 kb. A 16-amino acid signal peptide is present. Mature GP V is a 544-amino acid transmembrane protein with a 504-amino acid extracellular domain that encompasses a set of 15 tandem LRG repeats in a "flank-LRG center-flank" array [Roth, G. J. (1991) Blood 77, 5-19] along with eight putative N-linked glycosylation sites and cleavage sites for thrombin and calpain. GP V is a transmembrane, adhesive LRG protein that plays an undefined, but potentially critical, role in the expression and/or function of the Ib-V-IX receptor for vWf/shear-dependent platelet adhesion in arteries.
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Affiliation(s)
- M J Hickey
- Hematology Section, Seattle Veterans Administration Medical Center, WA 98105
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43
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Konkle BA, Schick PK, He X, Liu RJ, Mazur EM. Plasminogen activator inhibitor-1 mRNA is expressed in platelets and megakaryocytes and the megakaryoblastic cell line CHRF-288. ARTERIOSCLEROSIS AND THROMBOSIS : A JOURNAL OF VASCULAR BIOLOGY 1993; 13:669-74. [PMID: 8485117 DOI: 10.1161/01.atv.13.5.669] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Plasminogen activator inhibitor-1 (PAI-1) is present in the platelet alpha-granule and is released on platelet activation. Platelet PAI-1 could either be synthesized by the megakaryocyte or taken up from the plasma. In this report we confirm the presence of PAI-1 protein in human megakaryocytes by Western blot analysis and show its synthesis in guinea pig megakaryocytes by metabolic labeling. We document the presence of PAI-1 mRNA in human platelets and show a 3-kb mRNA species on Northern blot analysis of guinea pig megakaryocytes. Neither untreated CHRF-288 cells, a megakaryoblastic cell line, nor human erythroleukemia (HEL) cells expressed PAI-1 mRNA. Phorbol ester (phorbol 12-myristate 13-acetate, 160 nM) treatment of CHRF-288 and HEL cells for 4 days induced PAI-1 mRNA expression in CHRF-288 cells but not in HEL cells. These studies show that PAI-1 is synthesized by megakaryocytes. Megakaryocytes most likely determine the PAI-1 content of platelets and thereby establish the antifibrinolytic potential of the platelet.
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Affiliation(s)
- B A Konkle
- Cardeza Foundation for Hematologic Research, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107
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44
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Cooper DN. The Molecular Genetics of Platelet Membrane Proteins and their Inherited Disorders. Platelets 1991; 2:59-67. [PMID: 21047281 DOI: 10.3109/09537109109113690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The platelet membrane glycoproteins fulfil a vital function in platelet adhesion and aggrkgation. The advent of recombinant DNA technology has provided a wealth of new information on the sequence, structure, expression and chromosomal location of the genes encoding these proteins and Is now permitting the detailed molecular genetic analysis of both Bernard Soulier syndrome and Glanzmann's thrombasthenia.
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Affiliation(s)
- D N Cooper
- Molecular Genetics Section, Thrombosis Research Institute, Manresa Road, Chelsea, London SW3 6LR, UK
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46
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Hickey MJ, Deaven LL, Roth GJ. Human platelet glycoprotein IX. Characterization of cDNA and localization of the gene to chromosome 3. FEBS Lett 1990; 274:189-92. [PMID: 2253772 DOI: 10.1016/0014-5793(90)81361-q] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Overlapping cDNAs encoding human platelet glycoprotein (Gp)IX were cloned from a human erythroleukemia cell lambda gt11 library. The possibly 'full-length' cDNA of 896 base pairs (bp) includes an open reading frame (528 bp), both 5' (222 bp) and 3' (146 bp) noncoding regions, and a poly(A) tail. Translation predicts a signal peptide of 16 amino acids and a mature protein of 160 amino acids that includes a 24 amino acid leucine-rich glycoprotein (LRG) segment. Southern blot analysis suggests the presence of a single copy of the Gp IX gene, and hybridization of Gp IX cDNA to sorted human chromosomes localizes the Gp IX gene to chromosome 3.
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Affiliation(s)
- M J Hickey
- Seattle Veterans Administration Medical Center, WA 98108
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47
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Konkle BA, Shapiro SS, Asch AS, Nachman RL. Cytokine-enhanced expression of glycoprotein Ib alpha in human endothelium. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(17)45448-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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48
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Hickey MJ, Williams SA, Roth GJ. Human platelet glycoprotein IX: an adhesive prototype of leucine-rich glycoproteins with flank-center-flank structures. Proc Natl Acad Sci U S A 1989; 86:6773-7. [PMID: 2771955 PMCID: PMC297928 DOI: 10.1073/pnas.86.17.6773] [Citation(s) in RCA: 113] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The glycoprotein (GP) Ib-IX complex on the surface of human platelets functions as the von Willebrand factor receptor and mediates von Willebrand factor-dependent platelet adhesion to blood vessels. GPIX is a relatively small (Mr, 17,000) protein that may provide for membrane insertion and orientation of the larger component of the complex, GPIb (Mr, 165,000). Using antibody screening, we cloned a cDNA encoding GPIX from a human erythroleukemia cell cDNA library constructed in phage lambda gt11. Lacking a 5' untranslated region and start codon, the cDNA sequence includes 604 nucleotides, beginning with 495 bases at the 5' end coding for 165 amino acids, followed by a stop codon and 106 noncoding bases at the 3' end. By Northern blot analysis, the GPIX cDNA hybridizes with a single 1.0-kilobase species of platelet poly(A)+ RNA. Translation of the cDNA sequence gives a predicted protein sequence beginning with a truncated putative signal sequence of 5 amino acid followed by a sequence of 17 amino acids matching that determined directly by Edman degradation of intact GPIX. The predicted amino acid sequence of mature GPIX includes an NH2-terminal extracytoplasmic domain of 134 residues, a transmembrane domain of 20 residues, 6 intracytoplasmic residues, and 1 N-linked glycosylation site. GPIX contains a leucine-rich glycoprotein (LRG) sequence of 24 amino acids similar to conserved LRG sequences in GPIb and other proteins from humans, Drosophila, and yeast. "Flanking" sequences of approximately 22 amino acids are present at the NH2 and/or COOH sides of the "central" LRG sequence(s) in GPIX, GPIb, and the other human and Drosophila members of the LRG family. The role of the flank-LRG center-flank structure in the evolution and function of the LRG proteins remains to be defined.
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Affiliation(s)
- M J Hickey
- Hematology Section, Seattle Veterans Administration Medical Center, WA 98108
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