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Pina-Cabral LB, Carvalhais V, Mesquita B, Escórcio C, Silva PF, Pinto P, Napoleão P, Pinheiro T, Monteiro MC, Almeida-Dias A, Criado B. Myocardial infarction before and after the age of 45: Possible role of platelet receptor polymorphisms. REVISTA PORTUGUESA DE CARDIOLOGIA (ENGLISH EDITION) 2018. [DOI: 10.1016/j.repce.2018.03.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Pina-Cabral LB, Carvalhais V, Mesquita B, Escórcio C, Silva PF, Pinto P, Napoleão P, Pinheiro T, Monteiro MC, Almeida-Dias A, Criado B. Myocardial infarction before and after the age of 45: Possible role of platelet receptor polymorphisms. Rev Port Cardiol 2018; 37:727-735. [DOI: 10.1016/j.repc.2018.03.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 01/03/2018] [Accepted: 03/11/2018] [Indexed: 11/28/2022] Open
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Identification of a juxtamembrane mechanosensitive domain in the platelet mechanosensor glycoprotein Ib-IX complex. Blood 2014; 125:562-9. [PMID: 25359992 DOI: 10.1182/blood-2014-07-589507] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
How glycoprotein (GP)Ib-IX complex on the platelet surface senses the blood flow through its binding to the plasma protein von Willebrand factor (VWF) and transmits a signal into the platelet remains unclear. Here we show that optical tweezer-controlled pulling of the A1 domain of VWF (VWF-A1) on GPIb-IX captured by its cytoplasmic domain induced unfolding of a hitherto unidentified structural domain before the dissociation of VWF-A1 from GPIb-IX. Additional studies using recombinant proteins and mutant complexes confirmed its existence in GPIb-IX and enabled localization of this quasi-stable mechanosensitive domain of ∼60 residues between the macroglycopeptide region and the transmembrane helix of the GPIbα subunit. These results suggest that VWF-mediated pulling under fluid shear induces unfolding of the mechanosensitive domain in GPIb-IX, which may possibly contribute to platelet mechanosensing and/or shear resistance of VWF-platelet interaction. The identification of the mechanosensitive domain in GPIb-IX has significant implications for the pathogenesis and treatment of related blood diseases.
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Novel Bernard-Soulier syndrome variants caused by compound heterozygous mutations (case I) or a cytoplasmic tail truncation (case II) of GPIbα. Thromb Res 2013; 131:e160-7. [DOI: 10.1016/j.thromres.2013.01.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Revised: 11/28/2012] [Accepted: 01/09/2013] [Indexed: 11/21/2022]
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Dogra RK, Das R, Ahluwalia J, Kumar RM, Talwar KK. Prothrombotic gene polymorphisms and plasma factors in young North Indian survivors of acute myocardial infarction. J Thromb Thrombolysis 2012; 34:276-82. [PMID: 22535530 DOI: 10.1007/s11239-012-0734-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The aim of this study was to evaluate the association of prothrombotic gene polymorphisms [factor V Leiden (FVL) 1691GA, factor VII (FVII) 10976GA, FVII HVR4, platelet membrane glycoproteins GP1BA 1018CT, GP1BA VNTR, integrin ITGB3 1565TC, integrin ITGA2 807CT and methylenetetrahydrofolate reductase (MTHFR) 677C/T], plasma factors (fibrinogen and homocysteine) and traditional risk factors with acute myocardial infarction (AMI) in 184 patients ≤ 40 years of age and 350 controls (≤ 40 years) from north India. Multiple logistic-regression analysis showed that hypertension (OR 1.9, 95 % CI 1.1-3.8, p = 0.042), diabetes mellitus (OR 10.5, 95 % CI 2.0-56.7, p = 0.006), smoking (OR 7.1, 95 % CI 3.7-13.6, p < 0.001), low socio-economic status (OR 13.5, 95 % CI 2.3-78.4, p = 0.004), high waist-hip ratio (OR 35.6, 95 % CI 11.1-53.7, p < 0.001) and FVL 1691GA (OR 6.0, 95 % CI 1.2-13.4, p = 0.03) were independent risk predictors of AMI in young. Elevated plasma fibrinogen also showed association with increased AMI risk. ITGA2 807C/T polymorphism showed protection against AMI in univariate analysis only, while GP1BA VNTR-ac (OR 0.4, 95 % CI 0.2-0.9, p = 0.033) showed significant protection even after adjusting for age and sex. Multinominal logistic-regression analysis showed gene-gene (GP1BA 1018C/T with GP1BA VNTR and ITGA2 807C/T with ITGB3 1565T/C polymorphisms) and gene-environment interactions (gene polymorphisms with smoking) operating in the occurrence of AMI in young. In conclusion, the role of inherited predisposition to thrombosis in complex, polygenic and multifactorial disease like AMI is limited to certain genetic factors, in combination with environmental factor like smoking.
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Affiliation(s)
- Rupinder Kaur Dogra
- Department of Hematology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
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Yonal I, Hindilerden F, Hancer VS, Artim-Esen B, Daglar A, Akadam B, Nalcaci M, Diz-Kucukkaya R. The impact of platelet membrane glycoprotein Ib alpha and Ia/IIa polymorphisms on the risk of thrombosis in the antiphospholipid syndrome. Thromb Res 2011; 129:486-91. [PMID: 22036125 DOI: 10.1016/j.thromres.2011.10.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2011] [Revised: 09/28/2011] [Accepted: 10/04/2011] [Indexed: 10/15/2022]
Abstract
BACKGROUND Pathogenesis of thrombus formation in antiphospholipid syndrome (APS) is not clear. Platelet membrane glycoprotein (GP) receptors play important roles in development of thrombosis. OBJECTIVES We investigated the association between development of thrombosis in APS and polymorphisms of GPIb alpha variable number of tandem repeats (VNTR), Kozak, and GPIa C807T. Patients/Methods Sixty patients with APS (30 with proven thrombosis and 30 without thrombosis) and 63 controls were included. Presence of GPIa C807T polymorphism was determined with real-time PCR and GPIb alpha Kozak and VNTR polymorphisms by conventional PCR. RESULTS Frequency of C807T TT genotype was significantly higher in APS with thrombosis than APS without thrombosis (p=0.023) and also in APS with multiple thrombi compared to APS without thrombi (p=0.023). Frequency of Kozak TC genotype was higher in APS with arterial thrombosis compared to APS with venous thrombosis, controls, and APS without thrombosis (p=0.03, p=0.0007, and p=0.0024 respectively). D allele frequency and D allele carrier state for VNTR were significantly less in APS than controls (p=0.0018 and p=0.0046 respectively). CONCLUSIONS C807T TT genotype may confer a risk for thrombosis and Kozak TC genotype for arterial thrombosis. D allele of VNTR may protect from APS. No patients with C807T TT or Kozak TC genotypes carried the protective DD genotype of VNTR. These polymorphisms may increase risk for both arterial and venous thrombosis. The utility of prophylaxis with anti-platelet drugs in at least a subgroup of APS patients should be investigated with clinical trials.
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Affiliation(s)
- Ipek Yonal
- Istanbul University Istanbul Medical Faculty, Department of Internal Medicine, Division of Hematology.
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8
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Qiao JL, Shen Y, Gardiner EE, Andrews RK. Proteolysis of platelet receptors in humans and other species. Biol Chem 2011; 391:893-900. [PMID: 20482312 DOI: 10.1515/bc.2010.081] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the past 5 years, metalloproteinase-mediated ectodomain shedding of platelet receptors has emerged as a new mechanism for modulating platelet function. By regulating surface expression of the platelet-specific receptors, glycoprotein (GP)VI that binds collagen, and GPIbalpha (the major ligand-binding subunit of the GPIb-IX-V complex) that binds von Willebrand factor (VWF) and other procoagulant and proinflammatory ligands, shedding not only irreversibly downregulates GPVI/GPIbalpha function, but generates proteolytic fragments that might be unique biomarkers or modulators in plasma. This is potentially significant because GPVI and GPIbalpha are involved in initiating thrombotic diseases such as heart attack and stroke, as well as autoimmune diseases where anti-platelet antibodies result in thrombocytopenia. Altered expression levels of GPIbalpha/GPVI are associated with both thrombotic propensity and platelet aging, suggesting an additional role in platelet clearance. Although emerging data are elucidating molecular mechanisms underlying GPIbalpha/GPVI shedding, evidence for the functional consequences of shedding in vivo, either clinically or in animal models, is far more limited. Here we consider recent published evidence for GPVI or GPIbalpha shedding in humans, nonhuman primates and mice, and whether conservation of sheddase cleavage sites across species points to a functional role for metalloproteolytic shedding in vivo.
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Affiliation(s)
- Jian L Qiao
- Australian Centre for Blood Diseases, Monash University, Melbourne, Victoria, Australia
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Williams MS, Weiss EJ, Sabatine MS, Simon DI, Bahou WF, Becker LC, Parise LV, Dauerman HL, French PA, Smyth SS, Becker RC. Genetic regulation of platelet receptor expression and function: application in clinical practice and drug development. Arterioscler Thromb Vasc Biol 2010; 30:2372-84. [PMID: 21084706 DOI: 10.1161/atvbaha.110.218131] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Understanding genetic contributions to platelet function could have profound clinical ramifications for personalizing platelet-directed pharmacotherapy, by providing insight into the risks and possible benefits associated with specific genotypes. This article represents an integrated summary of presentations related to genetic regulation of platelet receptor expression and function given at the Fifth Annual Platelet Colloquium in January 2010. It is supplemented with additional highlights from the literature covering (1) approaches to determining and evidence for the associations of genetic variants with platelet hypo- and hyperresponsive phenotypes, (2) the ramifications of these polymorphisms with regard to clinical responses to antiplatelet therapies, and (3) the role of platelet function/genetic testing in guiding antiplatelet therapy.
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Affiliation(s)
- Marlene S Williams
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Md 21224, USA.
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Breslow NE, Lumley T, Ballantyne CM, Chambless LE, Kulich M. Using the whole cohort in the analysis of case-cohort data. Am J Epidemiol 2009; 169:1398-405. [PMID: 19357328 DOI: 10.1093/aje/kwp055] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Case-cohort data analyses often ignore valuable information on cohort members not sampled as cases or controls. The Atherosclerosis Risk in Communities (ARIC) study investigators, for example, typically report data for just the 10%-15% of subjects sampled for substudies of their cohort of 15,972 participants. Remaining subjects contribute to stratified sampling weights only. Analysis methods implemented in the freely available R statistical system (http://cran.r-project.org/) make better use of the data through adjustment of the sampling weights via calibration or estimation. By reanalyzing data from an ARIC study of coronary heart disease and simulations based on data from the National Wilms Tumor Study, the authors demonstrate that such adjustment can dramatically improve the precision of hazard ratios estimated for baseline covariates known for all subjects. Adjustment can also improve precision for partially missing covariates, those known for substudy participants only, when their values may be imputed with reasonable accuracy for the remaining cohort members. Links are provided to software, data sets, and tutorials showing in detail the steps needed to carry out the adjusted analyses. Epidemiologists are encouraged to consider use of these methods to enhance the accuracy of results reported from case-cohort analyses.
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Affiliation(s)
- Norman E Breslow
- Department of Biostatistics, University of Washington, Seattle, Washington 98195-7232, USA.
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Feher G, Feher A, Pusch G, Lupkovics G, Szapary L, Papp E. The genetics of antiplatelet drug resistance. Clin Genet 2009; 75:1-18. [DOI: 10.1111/j.1399-0004.2008.01105.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Luo SZ, Mo X, Afshar-Kharghan V, Srinivasan S, López JA, Li R. Glycoprotein Ibalpha forms disulfide bonds with 2 glycoprotein Ibbeta subunits in the resting platelet. Blood 2006; 109:603-9. [PMID: 17008541 PMCID: PMC1785083 DOI: 10.1182/blood-2006-05-024091] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
It is widely accepted that glycoprotein (GP) Ib contains one Ibalpha and one Ibbeta subunit that are connected by a disulfide bond. It is unclear which Cys residue in Ibalpha, C484 or C485, forms the disulfide bond with Ibbeta. Using mutagenesis studies in transfected Chinese hamster ovary (CHO) cells, we found that both C484 and C485 formed a disulfide bond with C122 in Ibbeta. In the context of isolated peptides containing the Ibalpha or Ibbeta transmembrane domain and nearby Cys residue, C484 and C485 in the Ibalpha peptide were both capable of forming a disulfide bond with the Ibbeta peptide. Furthermore, coimmunoprecipitation of epitope-tagged subunits showed that at least 2 Ibbeta subunits but only 1 Ibalpha and 1 IX subunit were present in the GP Ib-IX complex. Finally, the size difference between GP Ib from transfected CHO cells and human platelets was attributed to a combination of sequence polymorphism and glycosylation difference in Ibalpha, not the number of Ibbeta subunits therein. Overall, these results demonstrate that Ibalpha is covalently connected to 2 Ibbeta subunits in the resting platelet, necessitating revision of the subunit stoichiometry of the GP Ib-IX-V complex. The alphabeta2 composition in GP Ib may provide the basis for possible disulfide rearrangement in the receptor complex.
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Affiliation(s)
- Shi-Zhong Luo
- Center for Membrane Biology, Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston
| | - Xi Mo
- Center for Membrane Biology, Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston
| | - Vahid Afshar-Kharghan
- Thrombosis Research Section, Department of Medicine, Baylor College of Medicine, Houston, TX
| | - Sankaranarayanan Srinivasan
- Center for Membrane Biology, Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston
| | - José A. López
- Puget Sound Blood Center, Division of Hematology, Department of Medicine, University of Washington, Seattle
| | - Renhao Li
- Center for Membrane Biology, Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston
- Correspondence: Renhao Li,
Center for Membrane Biology, Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, MSB 6.130, 6431 Fannin St, Houston, TX 77030; e-mail:
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Douglas H, Davies GJ, Michaelides K, Gorog DA, Timlin H, Ahmed N, Tuddenham EGD. Detection of functional differences between different platelet membrane glycoprotein Ibalpha variable number tandem repeat and Kozak genotypes as shown by the PFA-100 system. Heart 2006; 92:676-8. [PMID: 16614281 PMCID: PMC1860909 DOI: 10.1136/hrt.2004.058545] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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15
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Affiliation(s)
- H Deckmyn
- Laboratory for Thrombosis Research, IRC, KU Leuven Campus Kortrijk, Kortrijk, Belgium.
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Matsubara Y, Murata M, Hayashi T, Suzuki K, Okamura Y, Handa M, Ishihara H, Shibano T, Ikeda Y. Platelet glycoprotein Ib alpha polymorphisms affect the interaction with von Willebrand factor under flow conditions. Br J Haematol 2005; 128:533-9. [PMID: 15686464 DOI: 10.1111/j.1365-2141.2004.05349.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Interaction of platelet glycoprotein (GP) Ibalpha with von Willebrand factor (VWF) is essential for thrombus formation, particularly under high shear conditions. Previous case-control studies indicated that two GPIb alpha polymorphisms, (145)Thr/Met and/or variable number (1-4) tandem repeats of 13 amino-acid sequences, are associated with arterial thrombosis. The (145)Met-allele and the 3R- or 4R-allele is associated with increased risk. However, there is little clear experimental data to support this association. To elucidate the functional effects of these polymorphisms, we prepared recombinant GPIb alpha fragments and tested them in vitro. The dissociation constants of ristocetin-induced (125)I-labelled VWF binding to two forms of soluble recombinant GPIb alpha [(1)His-(302)Ala, either (145)Thr (145T) or (145)Met (145M)] were not different. Four types of Chinese hamster ovary cells expressing full-length GPIb alpha beta/IX, 145T with one repeat (T1R), 145M with one repeat (M1R), 145T with four repeats (T4R), and 145M with four repeats (M4R), were prepared, and cell interactions with immobilized-VWF were examined under various shear conditions. The cell rolling velocity of M4R under a shear condition of 114/s was significantly slower than that of T1R. Intermediate values were obtained with M1R and T4R. The results suggest that M4R interacts more strongly with VWF under flow conditions.
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Kang SH, Shin DW, Oh MS, Ahn CW. An Investigation on the Allelic Chi-Square Test Used in Genetic Association Studies. Biom J 2004. [DOI: 10.1002/bimj.200410063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Yongbin N, Dayi H, Hong Y, Cuilan L, Wenling L, Hongyu W, Lei L. Association of genetic polymorphisms in the fibrinogen and platelet glycoprotein genes with unstable angina in Chinese patients. Clin Cardiol 2004; 27:455-8. [PMID: 15346842 PMCID: PMC6654742 DOI: 10.1002/clc.4960270807] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Inherited predisposition has been associated with coronary artery disease (CAD) in the white population. HYPOTHESIS The objective of this study was to investigate the association between the risk of unstable angina (UA) and genetic factors believed to be associated with an increased tendency toward thrombosis (the variable number of tandem repeats [VNTR] polymorphism of the platelet glycoprotein [GP] Ib alpha gene, Pl(A1/A2) of the platelet GP IIIa gene, 448G/A of the Bbeta fibrinogen gene and Thr312Ala of the Aalpha fibrinogen gene) in Chinese patients with UA. METHODS We performed a case/control study evaluating 69 Chinese patients (43 men, 26 women) with UA and 69 control subjects without CAD, individually matched for age and gender. The restriction fragment length polymorphism (RFLP) method was used to determine the genetic polymorphisms. RESULTS The frequencies of GP Ib alpha C/B genotype and Bbeta fibrinogen 448A allele were higher in patients with UA (46.4 vs. 30.4%, odds ratio [OR] 1.977, 95% confidence interval [CI] 0.98-3.97, p = 0.054, and 49.3 vs. 20.3%, OR 3.816, 95% CI 1.797-8.103, p = 0.000, respectively). Only four subjects (two cases, two controls) with GP IIIa Pl(A2) allele were found, and there was no association between Aalpha fibrinogen Thr312Ala polymorphism and UA. CONCLUSIONS Chinese patients with UA had increased frequencies of GP Ib alpha C/B genotype and Bbeta fibrinogen 448A allele. These data suggest that some genetic factors may influence the development of UA.
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Affiliation(s)
- Ni Yongbin
- Department of Cardiology, Peking University People' s Hospital, Beijing, People' s Republic of China
| | - Hu Dayi
- Department of Cardiology, Peking University People' s Hospital, Beijing, People' s Republic of China
| | - Yu Hong
- Department of Cardiology, Peking University People' s Hospital, Beijing, People' s Republic of China
| | - Li Cuilan
- Department of Cardiology, Peking University People' s Hospital, Beijing, People' s Republic of China
| | - Liu Wenling
- Department of Cardiology, Peking University People' s Hospital, Beijing, People' s Republic of China
| | - Wang Hongyu
- Department of Cardiology, Peking University People' s Hospital, Beijing, People' s Republic of China
| | - Li Lei
- Department of Cardiology, Peking University People' s Hospital, Beijing, People' s Republic of China
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