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Ningrum VDA, Istikharah R, Sadewa AH. Genetic Polymorphism of ITGA2 C807T Collagen Receptor Encoding Gene of Aspirin Therapy among Javanese-Indonesian Healthy Respondents. Open Access Maced J Med Sci 2021. [DOI: 10.3889/oamjms.2021.7430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND: Aspirin is an antiplatelet drug commonly administered as primary and secondary prophylaxis to prevent thromboembolic events. However, there has been a common incidence of aspirin resistance that leads to a recurrent cerebrovascular disease. One of the causes of such event is the genetic polymorphisms of the integrin alpha-2 (ITGA2) gene that encodes the glycoprotein Ia (GPIa) receptor in the pharmacodynamics of aspirin.
AIM: This study analyzed the genetic polymorphism of ITGA2 as the GPIa collagen receptor encoding gene of aspirin therapy among healthy Javanese, the largest ethnic group in Indonesia.
METHODS: This cross-sectional study involved 100 respondents who met the inclusion criteria with their blood sample taken for DNA isolation. Identification of genetic polymorphism in the target SNPs was done using the PCR-RFLP method with 5’-CCTTAAAGCTACCGGCCCATGT-3’ forward primer and 5’-TTGGCCTATTAGCACCAAAACTTACC-3’ reverse primer as well as Hpy188Irestriction enzyme to fragment the target at position 244 in the C base.
RESULTS: This study found that the dominant genotype and allele were CT (51%) and C (66.5%), respectively.
CONCLUSION: The allele frequency of ITGA2 gene in this study was similar to that of the populations in other Asian countries. Further research regarding the effects of ITGA2 C807T polymorphism on the pharmacodynamics of aspirin as an antiplatelet is recommended to minimize atherothrombotic events and examine its interactions as a biomarker of the risk and prognosis of some cancer types.
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An HJ, Ahn EH, Kim JO, Ryu CS, Park HS, Cho SH, Kim JH, Lee WS, Lee JR, Kim YR, Kim NK. Association between Platelet-Specific Collagen Receptor Glycoprotein 6 Gene Variants, Selected Biomarkers, and Recurrent Pregnancy Loss in Korean Women. Genes (Basel) 2020; 11:genes11080862. [PMID: 32751271 PMCID: PMC7464359 DOI: 10.3390/genes11080862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/13/2020] [Accepted: 07/25/2020] [Indexed: 01/31/2023] Open
Abstract
This paper investigates whether glycoprotein 6 (GP6) gene polymorphisms are a risk factor for recurrent pregnancy loss (RPL) in Korean women. Genotypes were determined by polymerase chain reaction-restriction fragment length polymorphism and real-time polymerase chain reaction amplification. We identified five polymorphisms in the GP6 gene: rs1654410 T>C, rs1671153 T>G, rs1654419 G>A, rs12610286 A>G, and rs1654431 G>A. GP6 rs1654410 CC was associated with decreased RPL risk (adjusted odds ratio = 0.292, 95% confidence interval = 0.105–0.815, p = 0.019), and recessive genotypes were also significantly associated with decreased RPL risk (adjusted odds ratio = 0.348, 95% confidence interval = 0.128−0.944, p = 0.038). GP6 rs1654419 GA was associated with decreased RPL risk (adjusted odds ratio = 0.607, 95% confidence interval = 0.375-0.982, p = 0.042), and dominant genotypes were significantly associated with decreased RPL risk (adjusted odds ratio = 0.563, 95% confidence interval = 0.358−0.885, p = 0.013). Altogether, the genotype frequencies of GP6 rs1654410 T>C and GP6 rs1654419 G>A were significantly different between RPL patients and control participants. Therefore, although GP6 polymorphisms may be useful as biomarkers of RPL, additional studies with heterogeneous cohorts are required to better understand the influence of GP6 and assess its performance as a biomarker.
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Affiliation(s)
- Hui Jeong An
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.J.A.); (J.O.K.); (C.S.R.); (H.S.P.); (S.H.C.)
| | - Eun Hee Ahn
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, School of Medicine, CHA University, Seongnam 13488, Korea; (E.H.A.); (J.H.K.)
| | - Jung Oh Kim
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.J.A.); (J.O.K.); (C.S.R.); (H.S.P.); (S.H.C.)
| | - Chang Soo Ryu
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.J.A.); (J.O.K.); (C.S.R.); (H.S.P.); (S.H.C.)
| | - Han Sung Park
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.J.A.); (J.O.K.); (C.S.R.); (H.S.P.); (S.H.C.)
| | - Sung Hwan Cho
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.J.A.); (J.O.K.); (C.S.R.); (H.S.P.); (S.H.C.)
| | - Ji Hyang Kim
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, School of Medicine, CHA University, Seongnam 13488, Korea; (E.H.A.); (J.H.K.)
| | - Woo Sik Lee
- Fertility Center of CHA Gangnam Medical Center, CHA University, Seoul 061, Korea;
| | - Jung Ryeol Lee
- Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam 13620, Korea;
| | - Young Ran Kim
- Department of Obstetrics and Gynecology, CHA Bundang Medical Center, School of Medicine, CHA University, Seongnam 13488, Korea; (E.H.A.); (J.H.K.)
- Correspondence: (Y.R.K.); (N.K.K.); Tel.: +82-31-780-5293 (Y.R.K.); +82-31-881-7137 (N.K.K.)
| | - Nam Keun Kim
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488, Korea; (H.J.A.); (J.O.K.); (C.S.R.); (H.S.P.); (S.H.C.)
- Correspondence: (Y.R.K.); (N.K.K.); Tel.: +82-31-780-5293 (Y.R.K.); +82-31-881-7137 (N.K.K.)
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Liu H, Wang Y, Zheng J, Li G, Chen T, Lei J, Mao Y, Wang J, Liu W, Zhao G, Tacey M, Yan B. Platelet glycoprotein gene Ia C807T, HPA-3, and Ibα VNTR polymorphisms are associated with increased ischemic stroke risk: Evidence from a comprehensive meta-analysis. Int J Stroke 2016; 12:46-70. [PMID: 28004990 DOI: 10.1177/1747493016672085] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Background/aims Platelet glycoproteins play a crucial role in the initial stage of thrombus formation and may contribute to the pathophysiology of atherosclerosis. Polymorphisms in glycoprotein genes alter the function of the protein, possibly leading to increased risk of ischemic stroke. However, previous genetic association studies that examined the relationship between glycoprotein genes polymorphisms and ischemic stroke have yielded inconsistent results. This study aimed to evaluate the association between glycoprotein genes and ischemic stroke by the application of meta-analysis. Methods Relevant studies were identified by an extensive search through databases. The quality of included studies was assessed independently using the Newcastle–Ottawa Scale. Allele and genotype frequencies for each included study were extracted. The odds ratio (OR) with 95% confidence interval (95%CI) was calculated using a random-effects or fixed-effects model. Q statistic was used to evaluate homogeneity, and a meta-regression model was used to explore the study-level variables and to describe the heterogeneity in included studies. Egger’s test and funnel plot were used to assess publication bias. Results A total of 60 studies (9 polymorphisms) were included and identified in the current meta-analysis. The Newcastle–Ottawa Scale scores ranged from 7 to 9 except for two studies with Newcastle–Ottawa Scale scores of 6. The T allele or TT genotype of the glycoprotein Ia C807T polymorphism were associated with an increased susceptibility to ischemic stroke in combined population (807T allele: OR, 95%CI: 1.24, 1.03–1.50, p = 0.02) or Asian populations (807T allele: OR, 95%CI: 1.31, 1.10–1.54, p = 0.002 and 807TT genotype: OR, 95%CI: 1.53, 1.13–2.08, p = 0.006, respectively), and the Ser allele of HPA-3 was associated with increased risk of ischemic stroke in combined population or in Asians (OR, 95%CI: 1.21, 1.04–1.40, p = 0.01 or 1.54, 1.18–2.01, p = 0.001). Of note, the Ser/Ser genotype was more common in Asians (OR, 95%CI: 2.09, 1.40–3.13, p < 0.001). For glycoprotein Ibα variable number tandem repeat, only B allele showed a mild significant association with ischemic stroke risk in combined population or in Caucasians (OR, 95%CI: 2.17, 1.04–4.55, p = 0.04 or 1.79, 1.02–3.13, p = 0.04). There was no significant association between HPA-1, HPA-2, HPA-4, HPA-5, glycoprotein Ibα-5 T/C as well as Ia G873A polymorphisms and increased risk of ischemic stroke. Conclusions We found that glycoprotein Ia C807T T allele or the TT genotype, the Ser-allele of HPA-3 and B allele of glycoprotein Ibα variable number tandem repeat polymorphisms were associated with increased risk for ischemic stroke. Future studies with larger sample sizes will be necessary to confirm the results. In addition, analyses of ischemic stroke subtypes and gene–gene and gene–environment interactions are warranted.
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Affiliation(s)
- Hua Liu
- Department of Neurology, the Second Clinical Medical College of North Sichuan Medical College & Nanchong Central Hospital, Nanchong, P R China
- Department of Neurology, The First Affiliated Hospital, Kunming Medical University, Kunming, PR China
- Melbourne Brain Centre, Royal Melbourne Hospital, University of Melbourne, Parkville, Victoria, Australia
| | - Yi Wang
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai, P R China
| | - Jian Zheng
- Department of Neurology, Xinqiao Hospital, the Third Military Medical University, Chongqing, PR China
| | - Guangming Li
- Department of Neurology, the Second Clinical Medical College of North Sichuan Medical College & Nanchong Central Hospital, Nanchong, P R China
| | - Tao Chen
- Department of Neurology, The First Affiliated Hospital, Kunming Medical University, Kunming, PR China
| | - Jianguo Lei
- Department of Neurology, the Fifth people's Hospital of Chengdu, North Sichuan Medical College, Chengdu, P R China
| | - Yiting Mao
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai, P R China
| | - Jun Wang
- Department of Neurology, the Fifth people's Hospital of Chengdu, North Sichuan Medical College, Chengdu, P R China
| | - Wei Liu
- Department of Neurology, the Second Clinical Medical College of North Sichuan Medical College & Nanchong Central Hospital, Nanchong, P R China
| | - Ge Zhao
- Department of Neurology, the Fifth people's Hospital of Chengdu, North Sichuan Medical College, Chengdu, P R China
| | - Mark Tacey
- Melbourne EpiCentre, Royal Melbourne Hospital and Department of Medicine, The University of Melbourne, Parkville, Victoria, Australia
| | - Bernard Yan
- Melbourne Brain Centre, Royal Melbourne Hospital, University of Melbourne, Parkville, Victoria, Australia
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Postula M, Janicki PK, Milanowski L, Pordzik J, Eyileten C, Karlinski M, Wylezol P, Solarska M, Czlonkowka A, Kurkowska-Jastrzebka I, Sugino S, Imamura Y, Mirowska-Guzel D. Association of frequent genetic variants in platelet activation pathway genes with large-vessel ischemic stroke in Polish population. Platelets 2016; 28:66-73. [DOI: 10.1080/09537104.2016.1203404] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Marek Postula
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
- Perioperative Genomics Laboratory, Penn State University, College of Medicine, Hershey, PA, USA
| | - Piotr K. Janicki
- Perioperative Genomics Laboratory, Penn State University, College of Medicine, Hershey, PA, USA
| | - Lukasz Milanowski
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
| | - Justyna Pordzik
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
| | - Ceren Eyileten
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
| | - Michal Karlinski
- 2nd Department of Neurology, Institute of Psychiatry and Neurology, Warsaw, Poland
| | - Pawel Wylezol
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
| | - Marta Solarska
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
| | - Anna Czlonkowka
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
- 2nd Department of Neurology, Institute of Psychiatry and Neurology, Warsaw, Poland
| | | | - Shigekazu Sugino
- Perioperative Genomics Laboratory, Penn State University, College of Medicine, Hershey, PA, USA
| | - Yuka Imamura
- Genome Sciences Facility, Penn State University, College of Medicine, Hershey, PA, USA
| | - Dagmara Mirowska-Guzel
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
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Milanowski L, Pordzik J, Janicki PK, Postula M. Common genetic variants in platelet surface receptors and its association with ischemic stroke. Pharmacogenomics 2016; 17:953-71. [PMID: 27269246 DOI: 10.2217/pgs.16.21] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ischemic stroke has been named one of the leading causes of death worldwide. Whereas numerous biological mechanisms and molecules were found to be associated with stroke, platelets are particularly contributive to its pathogenesis. Recent data indicate considerable variability in platelet phenotype which accounts for differences in platelet surface receptor function, count and reactivity. These features collectively influence both the events leading to a disease and effectiveness of antiplatelet therapies. Consequently, genetic variants predisposing to cerebrovascular diseases can be sequenced using a wide array of techniques and become a useful tool in clinical setting. In this review, we provide an outline of common platelet polymorphisms that impose risk on ischemic stroke development and should be evaluated as targets to improve treatment. As study results are often inconsistent, partly due to differences in demographic characteristics between study populations and the fact that the functional impact of these variants has been relatively small, we conclude that both rare, low-frequency and common variants might account for genetic contribution on abnormal platelet response to antiplatelet drugs.
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Affiliation(s)
- Lukasz Milanowski
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
| | - Justyna Pordzik
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland
| | - Piotr K Janicki
- Perioperative Genomics Laboratory, Penn State College of Medicine, Hershey, PA 17033, USA
| | - Marek Postula
- Department of Experimental and Clinical Pharmacology, Medical University of Warsaw, Center for Preclinical Research and Technology CEPT, Warsaw, Poland.,Perioperative Genomics Laboratory, Penn State College of Medicine, Hershey, PA 17033, USA
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Kubisz P, Stanciakova L, Stasko J, Dobrotova M, Skerenova M, Ivankova J, Holly P. Sticky platelet syndrome: an important cause of life-threatening thrombotic complications. Expert Rev Hematol 2015; 9:21-35. [PMID: 26567442 DOI: 10.1586/17474086.2016.1121095] [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] [Indexed: 12/17/2022]
Abstract
Sticky platelet syndrome (SPS) is a prothrombotic thrombocytopathy with familial occurrence, characterized by hyperaggregability of platelets in response to adenosine diphosphate (ADP), epinephrine (EPI) or both. The syndrome has been identified in approximately 21% of unexplained arterial thrombotic episodes, regarded to be the most common thrombophilia in arterial thrombosis and 13.2% of unexplained venous thromboembolism (VTE). The relatively young age at the first manifestation, relation to fertility and pregnancy, seriousness of the symptoms, easy and effective management of the disorder indicate to the necessity to take it into account in the differential diagnosis of the underlying cause of the thrombotic event. As the various localizations of the thrombosis in SPS have been reported, its management often requires a multidisciplinary approach. This review deals with the clinical aspects of thrombophilia, its etiopathogenesis, diagnosis as well as novel advances in the treatment and outlines the challenges for the further research.
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Affiliation(s)
- Peter Kubisz
- a National Center of Hemostasis and Thrombosis, Clinic of Hematology and Transfusiology, Jessenius Faculty of Medicine in Martin , Comenius University in Bratislava, Martin University Hospital , Martin , Slovak Republic
| | - Lucia Stanciakova
- a National Center of Hemostasis and Thrombosis, Clinic of Hematology and Transfusiology, Jessenius Faculty of Medicine in Martin , Comenius University in Bratislava, Martin University Hospital , Martin , Slovak Republic
| | - Jan Stasko
- a National Center of Hemostasis and Thrombosis, Clinic of Hematology and Transfusiology, Jessenius Faculty of Medicine in Martin , Comenius University in Bratislava, Martin University Hospital , Martin , Slovak Republic
| | - Miroslava Dobrotova
- a National Center of Hemostasis and Thrombosis, Clinic of Hematology and Transfusiology, Jessenius Faculty of Medicine in Martin , Comenius University in Bratislava, Martin University Hospital , Martin , Slovak Republic
| | - Maria Skerenova
- b Department of Clinical Biochemistry, Jessenius Faculty of Medicine in Martin , Comenius University in Bratislava, Martin University Hospital , Martin , Slovak Republic
| | - Jela Ivankova
- a National Center of Hemostasis and Thrombosis, Clinic of Hematology and Transfusiology, Jessenius Faculty of Medicine in Martin , Comenius University in Bratislava, Martin University Hospital , Martin , Slovak Republic
| | - Pavol Holly
- a National Center of Hemostasis and Thrombosis, Clinic of Hematology and Transfusiology, Jessenius Faculty of Medicine in Martin , Comenius University in Bratislava, Martin University Hospital , Martin , Slovak Republic
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Wu G, Xi Y, Yao L, Su L, Yan Y, Li M, Gu L. Genetic polymorphism of ITGA2 C807T can increase the risk of ischemic stroke. Int J Neurosci 2014; 124:841-51. [PMID: 24397542 DOI: 10.3109/00207454.2013.879718] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND The role of genetic variants in the pathogenesis of stroke has not been fully elucidated. Several studies have been examined the association of the Integrin alpha2 (ITGA2) gene-C807T (rs1126643) polymorphism with ischemic stroke susceptibility. However, the results of these studies are inconsistent. In order to explore this association more deeply, we performed a meta-analysis. METHODS We collected case-control studies concerning the relationship between the C807T polymorphism and ischemic stroke, and odd ratios (OR) with corresponding 95% confidence intervals (CI) were used to describe the relationships. Inconsistency index (I(2)) and Cochran's Q statistic were used to check heterogeneity. Publication bias was tested by funnel plots and Egger's test. RESULTS Fifteen studies with 2242 cases and 2408 controls were included. Our meta-analysis results indicated an association between the C807T polymorphism and the risk of ischemic stroke in the overall population, Asians and the subgroup of hospital-based people. However, statistically association was not observed for Caucasians and non-hospitalized individuals. CONCLUSIONS The ITGA2 gene C807T polymorphism may be a susceptible predictor of the risk of ischemic stroke. More data are needed to elucidate the relationship further.
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Affiliation(s)
- Guangliang Wu
- 1Department of Internal Neurology, First Affiliated Hospital, Guangxi University of Chinese Medicine, Nanning, Guangxi, China
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Abstract
Collagens constitute nearly 30% of all proteins in our body. Type IV collagen is a major and crucial component of basement membranes. Collagen chains undergo several posttranslational modifications that are indispensable for proper collagen function. One of these modifications, prolyl 3-hydroxylation, is accomplished by a family of prolyl 3-hydroxylases (P3H1, P3H2, and P3H3). The present study shows that P3H2-null mice are embryonic-lethal by embryonic day 8.5. The mechanism of the unexpectedly early lethality involves the interaction of non-3-hydroxylated embryonic type IV collagen with the maternal platelet-specific glycoprotein VI (GPVI). This interaction results in maternal platelet aggregation, thrombosis of the maternal blood, and death of the embryo. The phenotype is completely rescued by producing double KOs of P3H2 and GPVI. Double nulls are viable and fertile. Under normal conditions, subendothelial collagens bear the GPVI-binding sites that initiate platelet aggregation upon blood exposure during injuries. In type IV collagen, these sites are normally 3-hydroxylated. Thus, prolyl 3-hydroxylation of type IV collagen has an important function preventing maternal platelet aggregation in response to the early developing embryo. A unique link between blood coagulation and the ECM is established. The newly described mechanism may elucidate some unexplained fetal losses in humans, where thrombosis is often observed at the maternal/fetal interface. Moreover, epigenetic silencing of P3H2 in breast cancers implies that the interaction between GPVI and non-3-hydroxylated type IV collagen might also play a role in the progression of malignant tumors and metastasis.
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Kubisz P, Ivanková J, Škerenˇová M, Staško J, Hollý P. The prevalence of the platelet glycoprotein VI polymorphisms in patients with sticky platelet syndrome and ischemic stroke. Hematology 2013; 17:355-62. [DOI: 10.1179/1024533212z.000000000142] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Affiliation(s)
- Peter Kubisz
- Department of Hematology and Transfusion MedicineNational Center of Hemostasis and Thrombosis, Jessenius Faculty of Medicine, Comenius University, Martin, Slovakia
| | - Jela Ivanková
- Department of Hematology and Transfusion MedicineNational Center of Hemostasis and Thrombosis, Jessenius Faculty of Medicine, Comenius University, Martin, Slovakia
| | - Mária Škerenˇová
- Department of BiochemistryJessenius Faculty of Medicine, Comenius University, Martin, Slovakia
| | - Ján Staško
- Department of Hematology and Transfusion MedicineNational Center of Hemostasis and Thrombosis, Jessenius Faculty of Medicine, Comenius University, Martin, Slovakia
| | - Pavol Hollý
- Department of Hematology and Transfusion MedicineNational Center of Hemostasis and Thrombosis, Jessenius Faculty of Medicine, Comenius University, Martin, Slovakia
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Qiao J, Arthur JF, Collecutt M, Shen Y, Mu FT, Berndt MC, Davis AK, Andrews RK, Gardiner EE. An acquired defect associated with abnormal signaling of the platelet collagen receptor glycoprotein VI. Acta Haematol 2012; 128:233-41. [PMID: 22922528 DOI: 10.1159/000340048] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Accepted: 05/28/2012] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Ligands acting at the platelet collagen receptor, glycoprotein (GP)VI, induce intracellular FcRγ/Syk-dependent signaling pathways and Syk-dependent or Syk-independent generation of intracellular reactive oxygen species (ROS). Additional signaling-dependent or signaling-independent pathways lead to metalloproteinase-mediated shedding of GPVI. AIM Analysis of platelet GPVI expression and signaling in a patient with a collagen-selective defect associated with myelodysplastic syndrome (MDS) uniquely demonstrates divergent pathways leading to ROS generation and Syk phosphorylation in human platelets. METHODS Surface expression of GPVI and ligand-induced ROS generation was quantitated by flow cytometry. GPVI shedding and Syk phosphorylation were analyzed by Western blot. RESULTS Despite platelet count/size and GPVI surface expression within normal ranges, platelet-rich plasma showed no aggregation in response to collagen or GPVI-selective agonist collagen-related peptide, but aggregated in response to other agonists, consistent with dysfunctional GPVI signaling. We observed rapid GPVI-dependent Syk-independent ROS generation and disulfide-dependent GPVI homodimerization, but not Syk-dependent ROS or ligand-induced shedding. Temporal analysis showed a gradual decline in platelet count and the appearance of ligand-induced phosphorylation of an ∼40-kDa Syk fragment. CONCLUSIONS These studies show that GPVI ligation in platelets induces intracellular ROS production independent of either Syk activation or divergent pathways leading to platelet aggregation or ectodomain shedding.
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Affiliation(s)
- Jianlin Qiao
- Australian Centre for Blood Diseases, Monash University, Melbourne, Vic., Australia
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Park HK, Jo DJ. Polymorphisms of integrin, alpha 6 contribute to the development and neurologic symptoms of intracerebral hemorrhage in korean population. J Korean Neurosurg Soc 2011; 50:293-8. [PMID: 22200009 DOI: 10.3340/jkns.2011.50.4.293] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 07/18/2011] [Accepted: 10/17/2011] [Indexed: 01/29/2023] Open
Abstract
OBJECTIVE The extracellular matrix (ECM) and cell adhesion molecules play crucial roles in angiogenesis, apoptosis, thrombosis, and inflammation, and also contribute to the pathogenesis of stroke. Integrin, alpha 6 (ITGA6) is a member of ECM adhesion receptors. We investigated whether two single nucleotide polymorphisms (SNPs) (rs11895564, Ala380Thr; rs2293649, Asp694Asp) of ITGA6 were associated with the development and clinical phenotypes of intracerebral hemorrhage (ICH) and ischemic stroke (IS). METHODS We enrolled 199 stroke (78 ICH and 121 IS) and 291 control subjects. Stroke patients were divided into subgroups according to the scores of the National Institutes of Health Stroke Survey (NIHSS, <6 and ≥6) and Modified Barthel Index (MBI, <60 and ≥60). SNPStats, SNPAnalyzer, and Helixtree programs were used to calculate odds ratios, 95% confidence intervals, and p values. Multiple logistic regression models were used to analyze genetic data. RESULTS A missense SNP rs11895564 was associated with the development of ICH (p=0.026 in codominant2, p=0.013 in recessive, p=0.02 in log-additive models; p=0.041 in allele distributions). The A allele frequency of rs11895564 was higher in the ICH group (13.5%) than in the control group (8.1%). In the clinical phenotypes, rs11895564 and rs2293649 showed significant associations in the MBI scores of IS (p=0.014 in codominant1 model; p=0.02 in allele distributions) and NIHSS scores of ICH (p=0.017 in codominant2, p=0.035 in recessive, p=0.035 in log-additive models), respectively. CONCLUSION These results suggest that ITGA6 may be associated with the development and clinical phenotypes of stroke in Korean population.
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Affiliation(s)
- Hyun-Kyung Park
- Department of Emergency Medicine, Kyung Hee University Hospital at Gangdong, School of Medicine, Kyung Hee University, Seoul, Korea
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Al-Tamimi M, Gardiner EE, Thom JY, Shen Y, Cooper MN, Hankey GJ, Berndt MC, Baker RI, Andrews RK. Soluble glycoprotein VI is raised in the plasma of patients with acute ischemic stroke. Stroke 2010; 42:498-500. [PMID: 21193745 DOI: 10.1161/strokeaha.110.602532] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE Ischemic stroke induced by thrombosis may be triggered by atherosclerotic plaque rupture and collagen-induced platelet activation. Collagen induces glycoprotein VI shedding. METHODS We measured plasma-soluble glycoprotein VI (sGPVI) by enzyme-linked immunosorbent assay in 159 patients with acute (<7-day) ischemic stroke and age/sex-matched community-based control subjects. RESULTS sGPVI was elevated in stroke compared with controls (P=0.0168). ORs were higher in Quartile 4 for stroke cases (P=0.0121), and sGPVI was significantly elevated in stroke associated with large artery disease across Quartiles 2 to 4 and small artery disease in Quartile 4. sGPVI decreased 3 to 6 months after antiplatelet treatment, consistent with elevated sGPVI due to platelet activation during the thrombotic event. sGPVI correlated with P-selectin (P=0.0007) and was higher in individuals with the GPVIa haplotype (P=0.024). CONCLUSIONS Glycoprotein VI shedding is implicated in the pathology of acute ischemic stroke.
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López-Cuenca A, Marín F, Roldán V, González-Conejero R, Hernández-Romero D, Valdés M, Lip GYH. Genetic polymorphisms and atrial fibrillation: Insights into the prothrombotic state and thromboembolic risk. Ann Med 2010; 42:562-75. [PMID: 20681943 DOI: 10.3109/07853890.2010.507601] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The pathophysiology of thromboembolism in atrial fibrillation (AF) is a multifactorial and complex process. Abnormalities of haemostasis, fibrinolysis, endothelium, and platelets have all been described in AF. This prothrombotic state observed in AF appears to be additive to the presence of clinical and echocardiography risk factors for thromboembolism. Nonetheless, the precise mechanistic pathway(s) leading to the prothrombotic state in AF remain to be elucidated. Of note, there are limited data on the influence of genetic polymorphisms in thromboembolic risk associated with AF. On the other hand, the response to coumarin derivatives depends on several factors, such as sex, age, diet, or interacting drugs. Optimal anticoagulation control is usually hampered by significant interindividual variability in dose requirements for a given target level of anticoagulation. There is increasing evidence that interindividual sensitivity and side-effects to coumarinics may be largely determined genetically. Thus, genetic polymorphisms could explain the individual risk of developing an adverse drug reaction (bleeding) or drug inefficacy (thrombosis) with oral anticoagulation. In this article, we provide an overview of the limited data about the possible influence of genetic polymorphisms on thromboembolic risk in AF, as well as the genetic influences on anticoagulant drug responsiveness.
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Affiliation(s)
- Angel López-Cuenca
- Department of Cardiology, Hospital Universitario Virgen Arrixaca, Murcia, Spain
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14
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Snoep JD, Gaussem P, Eikenboom JCJ, Emmerich J, Zwaginga JJ, Holmes CE, Vos HL, de Groot PG, Herrington DM, Bray PF, Rosendaal FR, van der Bom JG. The minor allele of GP6 T13254C is associated with decreased platelet activation and a reduced risk of recurrent cardiovascular events and mortality: results from the SMILE-Platelets project. J Thromb Haemost 2010; 8:2377-84. [PMID: 20723028 DOI: 10.1111/j.1538-7836.2010.04018.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Contradictory results have been published on the effects of T13254C (rs1613662), which distinguishes the two major isoforms of GP6, the gene encoding the platelet receptor glycoprotein VI, on platelet function and the risk of cardiovascular disease. METHODS We performed a population-based case-control study, the Study of Myocardial Infarctions in Leiden, among 547 male patients with a first myocardial infarction (MI) and 646 control subjects, as well as a prospective cohort study in which the same MI patients were followed for recurrent events (fatal and non-fatal MI and unstable angina) and mortality (median follow-up of 12 years). P-selectin expression by platelets induced by crosslinked collagen-related peptide (CRP-XL) was measured by whole blood flow cytometry in 274 MI patients. RESULTS T13254C was not associated with a first MI, but seemed to be associated with a reduced incidence of recurrent events [per-allele hazard ratio 0.77, 95% confidence interval (CI) 0.56-1.06] and mortality (hazard ratio 0.57, 95% CI 0.37-0.89). Pooling with the Heart and Estrogen/Progestin Replacement Study revealed hazard ratios of 0.81 (95% CI 0.66-0.99) and 0.73 (95% CI 0.55-0.96). The minor C-allele was also strongly associated with a reduced percentage of P-selectin-expressing platelets. The reduction per C-allele was 23% (95% CI 18-28%). In an independent study of 219 healthy volunteers, the per-allele reduction of CRP-XL-induced aggregation was 10% (95% CI 2-18%). CONCLUSION The minor allele of GP6 T13254C that reduced platelet activation and aggregation also seemed to be associated with a reduced incidence of recurrent cardiovascular events and mortality, but was not associated with first MI.
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Affiliation(s)
- J D Snoep
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands
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15
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Stankovic S, Majkic-Singh N. Genetic aspects of ischemic stroke: coagulation, homocysteine, and lipoprotein metabolism as potential risk factors. Crit Rev Clin Lab Sci 2010; 47:72-123. [DOI: 10.3109/10408361003791520] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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16
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The low-frequency isoform of platelet glycoprotein VIb attenuates ligand-mediated signal transduction but not receptor expression or ligand binding. Blood 2009; 114:1893-9. [PMID: 19465689 DOI: 10.1182/blood-2009-03-209510] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The 2 most common haplotypes of human GP6, GP6a and GP6b, generate the allelic isoforms glycoprotein VI (GPVI)a and GPVIb that differ by 5 amino acids: S219P, K237E, and T249A in the ectodomains, and Q317L and H322N in the cytoplasmic domain. By quantitative Western blot, we found no association between GP6 genotype and total platelet GPVI content among 132 normal subjects. When expressed as soluble products or as membrane-associated receptors, GPVIa and GPVIb have identical affinities for type I collagen, collagen-related peptide, or convulxin. However, the cytoplasmic domain substitutions in GPVIb have a significant effect on GPVI-dependent subcellular associations and ligand-induced signal transduction. L317 increases binding to calmodulin, whereas N322 attenuates binding to Fyn/Lyn. Consistent with the latter finding, convulxin-induced Syk phosphorylation is significantly attenuated in Dami cells stably transfected with GPVIb, relative to GPVIa. This represents direct evidence that haplotype-related GPVI functional differences are inherent in the cytoplasmic domain substitutions, whereby GPVIb binds less strongly to Fyn/Lyn and attenuates the rate and extent of Syk phosphorylation. These allelic differences in GP6a and GP6b explain functional differences in the respective isoforms, but the molecular basis for the several-fold range in GPVI levels of human platelets remains to be determined.
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17
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Achterberg S, Kappelle LJ, Algra A. Prognostic modelling in ischaemic stroke study, additional value of genetic characteristics. Rationale and design. Eur Neurol 2008; 59:243-52. [PMID: 18264013 DOI: 10.1159/000115638] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2007] [Accepted: 08/31/2007] [Indexed: 11/19/2022]
Abstract
BACKGROUND AND AIM The prediction of prognosis after cerebral infarction might be improved by genetic information. The aim of the Prognostic Modelling in Ischaemic Stroke study is to develop 2 different prognostic models on the basis of traditional vascular risk factors and genetic information in patients who have suffered from cerebral ischaemia of arterial origin, 1 concerning new ischaemic and the other new haemorrhagic events. METHODS Polymorphisms and haplotypes describing the haemostatic system and those that influence antithrombotic drug activity will be identified in a cohort of 1,200 patients with cerebral ischaemia of arterial origin who will be followed up for a mean of 6.5 years. In total, 312 ischaemic and 78 haemorrhagic events are anticipated. With a prevalence of a genetic characteristic of 10% a relative risk of 1.4 (95% confidence interval = 1.1-1.8) for ischaemic events and of 1.8 (95% confidence interval = 1.0-3.2) for haemorrhagic events can be estimated with sufficient precision. To determine the additional prognostic value of genetic characteristics the area under the ROC curves of 2 separate models will be compared: 1 based on non-genetic risk factors only, the other also including genetic data.
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Affiliation(s)
- S Achterberg
- Department of Neurology, Rudolf Magnus Institute of Neuroscience, University Medical Centre Utrecht, Utrecht, The Netherlands.
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18
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Surin WR, Barthwal MK, Dikshit M. Platelet collagen receptors, signaling and antagonism: Emerging approaches for the prevention of intravascular thrombosis. Thromb Res 2008; 122:786-803. [DOI: 10.1016/j.thromres.2007.10.005] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2007] [Revised: 10/17/2007] [Accepted: 10/21/2007] [Indexed: 02/02/2023]
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19
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Wiwanitkit V. PIA1/A2 polymorphism of the platelet glycoprotein receptor IIb/IIIIa and its correlation to cerebrovascular diseases: an appraisal. Clin Appl Thromb Hemost 2007; 15:458-60. [PMID: 18160561 DOI: 10.1177/1076029607310220] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Platelet glycoprotein (GP) IIb/IIIa is a membrane receptor for fibrinogen and von Willebrand factor. There is considerable controversy regarding the clinical role of the GP IIb/IIIa PIA1/A2 as a risk factor of cerebrovascular diseases. Here, the author performs a summative analysis on the recent previous reports on the GP IIb/IIIa PIA1/A2 and its correlation to cerebrovascular diseases. The meta-analysis was performed to assess the correlation between the pattern of GP IIb/IIIa PIA1/A2 polymorphism and cerebrovascular diseases. From available 4 case-control studies, 553 patients and 1059 controls are evaluated. From overall risk estimation, the subjects with PIA2 alleles have 1.18 times higher risk to develop cerebrovascular diseases. According to this analysis, the author proposes that the pattern of GP IIb/IIIa PIA1/A2 polymorphism does not represent a useful marker of increased risk for cerebrovascular diseases. The lack of association between pattern of GP IIb/IIIa PIA1/A2 polymorphism and ethnicity can also be showed in this study.
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Affiliation(s)
- Viroj Wiwanitkit
- Department of Laboratory Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
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20
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Abstract
Human patients with defects associated with the platelet collagen receptor, glycoprotein (GP)VI, are rare and usually described as having a mild bleeding disorder. However, here we review clinical profiles of patients with familial or acquired GPVI defects, revealing the bleeding defect is often severe and associated with immune dysfunction. GPVI is a member of the immunoreceptor family, and co-expressed on platelets with Fc receptor gamma-chain (FcRgamma). Ligand binding to GPVI leads to activation of platelet integrins, in particular alpha(IIb)beta(3) that mediates platelet aggregation; and activation of endogenous platelet metalloproteinases resulting in ectodomain shedding and release of a soluble GPVI fragment. Increasing evidence supports the functional importance of GPVI/FcRgamma in thrombus formation at arterial shear rates, and expression levels of platelet GPVI may be a marker of thrombotic risk. Over the past 20 years, patients have been reported with GPVI-related defects involving: (i) an acquired deficiency, resulting from (a) anti-GPVI autoantibodies or (b) other causes; or (ii) a congenital deficiency, where (c) GPVI is not expressed or (d) is expressed in a dysfunctional form with defective signalling to alpha(IIb)beta(3). Clinical consequences of GPVI-related defects may be uniquely informative about the role of platelet GPVI in health and disease.
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Affiliation(s)
- Jane F Arthur
- Department of Immunology, Monash University, Alfred Medical Research and Education Precinct, Melbourne, VIC, Australia
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21
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de Oliveira MHCF, André C, Spector N, Luiz RR, de Castro Souza G, Gadelha T. 807C/T polymorphism in the platelet glycoprotein Ia gene in young patients with ischemic stroke of undetermined etiology. Blood Coagul Fibrinolysis 2007; 18:599-602. [PMID: 17890945 DOI: 10.1097/mbc.0b013e3282010ad0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Platelet membrane glycoprotein receptors mediate key reactions in arterial thrombosis. The relationship between glycoprotein Ia polymorphisms and the risk of ischemic stroke, however, remains controversial. A matched case-control study was conducted to evaluate this question in young patients. Seventy patients with ischemic stroke of undetermined etiology, with ages ranging from 15 to 50 years, and 70 healthy control individuals, matched by age, gender and ethnicity, were tested for the 807C/T genotypes. Patients were excluded if they had systemic diseases known to predispose to thrombosis or any defined etiology of ischemic stroke. The frequencies of the 807T glycoprotein Ia variant and of conventional risk factors for arterial thrombosis (hypertension, smoking, diabetes mellitus, use of oral contraceptives, levels of serum cholesterol and body mass index) were compared in stroke patients and control individuals. The 807T allele was found in 61% of patients and 53% of control individuals (matched-pair odds ratio, 1.38; 95% confidence interval, 0.69-2.74; P = 0.42). Arterial hypertension and smoking were more frequent in patients than control individuals (matched-pair odds ratio, 2.83; 95% confidence interval, 1.05-8.02; P = 0.04; and odds ratio, 3.20; 95% confidence interval, 1.10-9.97, P = 0.03, respectively). In conclusion, our results do not support an independent association between the 807C/T polymorphism and stroke of undetermined etiology. The interplay of this polymorphism with arterial hypertension in the causation of ischemic stroke requires further evaluation.
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Affiliation(s)
- Mônica H C F de Oliveira
- Hematology Service, Department of Internal Medicine, Hospital Universitário Clementino Fraga Filho, Federal University of Rio de Janeiro, Brazil
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22
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Dunkley S, Arthur JF, Evans S, Gardiner EE, Shen Y, Andrews RK. A familial platelet function disorder associated with abnormal signalling through the glycoprotein VI pathway. Br J Haematol 2007; 137:569-77. [PMID: 17539777 DOI: 10.1111/j.1365-2141.2007.06603.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The platelet collagen receptor, glycoprotein (GP)VI, of the immunoreceptor family forms a complex with the von Willebrand factor (VWF) receptor, GPIb-IX-V, critical for initiating thrombus formation. GPVI is co-associated with Fc receptor gamma-chain (FcRgamma), which contains a cytoplasmic immunoreceptor tyrosine-based activation motif domain, involved in activation of Syk, and a signalling cascade leading to (i) activation of alpha(IIb)beta(3), which binds VWF and fibrinogen and mediates platelet aggregation, and (ii) metalloproteinase-mediated shedding of the GPVI ectodomain (blocked by Syk inhibitors), a key mechanism for regulating GPVI surface expression. In this study, we report a familial case of abnormal platelet aggregation with dysfunctional signalling through GPVI that uniquely demonstrates divergent alpha(IIb)beta(3)-activating and GPVI-shedding pathways. The patient is a 60-year-old female with a history of immune disorders, excessive bleeding from childhood and a life-threatening haemorrhage post-trauma. Platelet aggregation to ADP, thrombin receptor-agonist peptide or ristocetin/VWF was normal (indicating normal expression and function of alpha(IIb)beta(3)), but platelet aggregation to GPVI agonists, collagen, collagen-related peptide, or convulxin, was defective. Both GPVI/FcRgamma expression and ligand-induced GPVI ectodomain shedding were normal, confirming expression of functional GPVI/FcRgamma, but suggesting a signalling defect downstream of Syk. A genetic defect in GPVI/Fcgamma signalling compromising platelet function is hypothesised in this family.
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Affiliation(s)
- Scott Dunkley
- Institute of Haematology, Royal Prince Alfred Hospital, Camperdown, NSW, Australia.
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23
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Loncar R, Stoldt V, Hellmig S, Zotz RB, Mihalj M, Scharf RE. HPA-1 polymorphism of alphaIIbbeta3 modulates platelet adhesion onto immobilized fibrinogen in an in-vitro flow system. Thromb J 2007; 5:2. [PMID: 17309793 PMCID: PMC1802753 DOI: 10.1186/1477-9560-5-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2006] [Accepted: 02/19/2007] [Indexed: 11/10/2022] Open
Abstract
Background Platelet adhesion and subsequent thrombus formation on a subendothelial matrix at the site of vascular damage play a crucial role in the arrest of posttraumatic bleeding but also in different pathological thrombotic events, such as acute coronary syndrome and stroke. Recently published studies have clearly demonstrated that platelet integri αIIbβ3 is intimately involved in the occlusive thrombus formation at the site of endothelial damage. Therefore, any genetic variation in the expression of this receptor may lead to an excessive bleeding or excessive thrombus formation. In this study, we evaluated the influence of HPA-1 polymorphism of integrin αIIbβ3 on platelet adhesion onto immobilized fibrinogen using an in vitro system simulating blood flow. Methods Platelets in anticoagulated whole blood [49 healthy previously genotyped blood donors) were labelled with fluorescence dye and perfused through a rectangular flow chamber (shear rates of 50 s-1, 500 s-1 and 1500 s-1). A fluorescence laser-scan microscope was used for visualisation and quantification of platelet adhesion at 15 sec, 1 and 5 minutes after start of perfusion. Results During perfusion, the platelet adhesion linearly increased with regard to exposition time and shear rate. Perfusion of blood preincubated with Abciximab over fibrinogen-coated cover-slips showed reduced platelet adherence (absolute fluorescence: 168 ± 35 U vs. 53000 ± 19000 at control experiments, p < 0.05), as well as by perfusion over BSA-coated glass coverslips. Platelet with HPA-1a/1a genotype exhibited initial better adhesion but they also exhibited higher detachment under arterial flow conditions compared to the HPA-1b/1b platelets. Analysis of stable adhesion rate indicate that the platelets carrying the HPA-1b/1b genotype have a higher reactivity threshold for initial interaction with fibrinogen but under the higher shear rate (in regard to time of perfusion) also realize more stable bonds with fibrinogen than platelets with the HPA-1a/1a genotype. Conclusion Our data support the contention that genetically determined variants of platelet integrins αIIbβ3 could play a role in arterial thrombogenesis and thus confirm the hypothesis derived from epidemiological studies.
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Affiliation(s)
- Robert Loncar
- Department of Hemostasis and Transfusion Medicine, Heinrich Heine University Medical Center Duesseldorf, Germany
| | - Volker Stoldt
- Department of Hemostasis and Transfusion Medicine, Heinrich Heine University Medical Center Duesseldorf, Germany
| | - Sabine Hellmig
- Department of Hemostasis and Transfusion Medicine, Heinrich Heine University Medical Center Duesseldorf, Germany
| | - Rainer B Zotz
- Department of Hemostasis and Transfusion Medicine, Heinrich Heine University Medical Center Duesseldorf, Germany
| | - Mario Mihalj
- Department of Neurology, University Hospital Firule, Split, Croatia
| | - Rüdiger E Scharf
- Department of Hemostasis and Transfusion Medicine, Heinrich Heine University Medical Center Duesseldorf, Germany
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24
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Nikolopoulos GK, Tsantes AE, Bagos PG, Travlou A, Vaiopoulos G. Integrin, alpha 2 gene C807T polymorphism and risk of ischemic stroke: A meta-analysis. Thromb Res 2007; 119:501-10. [PMID: 16820192 DOI: 10.1016/j.thromres.2006.04.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2006] [Revised: 04/14/2006] [Accepted: 04/17/2006] [Indexed: 10/24/2022]
Abstract
INTRODUCTION Platelet adhesion to fibrillar collagen via the membrane glycoprotein (GP) Ia/IIa (alpha2beta1), is a crucial event in the pathogenesis of arterial occlusive disorders. The C807T single nucleotide polymorphism of the integrin, alpha 2 (ITGA2) gene has been shown to correlate with the platelet GPIa/IIa density. Consequently, subjects with the 807T allele, who express the highest receptor density, might have an increased potential of platelet adhesion and, hence an increased risk of cerebrovascular disease. However, the research findings remain controversial. MATERIALS AND METHODS A comprehensive electronic search was carried out up until November 2005 and 7 independent studies with a maximum of 774 cases and 1074 controls were analyzed using random effects models. RESULTS The pooled frequency of the T allele was 36.33% in cases and 37.01% in controls. The T versus the C allele contrast gave an OR of 1.11 (95% confidence interval=0.827-1.499). All the other comparisons failed to show any significant result. Age, sex, and cardiovascular risk factors were included as covariates into a meta-regression model without a significant finding. CONCLUSIONS This meta-analysis do not support an association between the C807T polymorphism of ITGA2 gene and stroke, but given the significant between study heterogeneity and the small number of studies, the summary effect should be interpreted carefully.
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Feinbloom D, Bauer KA. Assessment of Hemostatic Risk Factors in Predicting Arterial Thrombotic Events. Arterioscler Thromb Vasc Biol 2005; 25:2043-53. [PMID: 16100033 DOI: 10.1161/01.atv.0000181762.31694.da] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Arterial thrombosis results from endovascular injury and, to a lesser extent, alterations in hemostatic equilibrium. Although multiple hereditary and acquired hemostatic risk factors have been described in the pathophysiology of venous thrombosis, the degree and type of abnormalities that contribute to arterial thrombosis are less well understood. Endothelial cell injury with the elaboration of proinflammatory mediators stimulates the process of arterial thrombosis. Although this is most often the result of endovascular injury attributable to atherosclerotic disease, other disease states can elicit a similar response as well. Similarly, once thrombosis has been initiated, variations in the activity of coagulation proteins and endogenous anticoagulants, as well as the kinetics of platelet aggregation, may alter the effectiveness of thrombus formation. Epidemiological studies have identified several acquired or inherited states that may result in endothelial damage or altered hemostatic equilibrium, thereby predisposing patients to arterial thrombosis. These include hyperhomocysteinemia, elevated C-reactive protein, antiphospholipid antibodies, elevated fibrinogen, Factor VII, plasminogen activator inhibitor-1 (PAI-1), hereditary thrombophilias, and platelet hyper-reactivity. This review explores our present understanding of these risk factors in the development of arterial thrombotic events. At present, the literature supports a role for hyperhomocysteinemia, elevated C-reactive protein, and elevated fibrinogen as risk factors for arterial thrombosis. Similarly, the literature suggests that lupus anticoagulants and, to a lesser extent, elevated titers of cardiolipin IgG antibodies predispose to arterial vascular events. In certain subsets of patients, including those with concomitant cardiac risk factors, <55 years of age, and women, hereditary thrombophilias such as carriership of the factor V Leiden and the prothrombin G20210A mutations may confer a higher risk of arterial thrombosis. However, the data on Factor VII, PAI-1, and platelet receptor polymorphisms are contradictory or lacking.
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Affiliation(s)
- David Feinbloom
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
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26
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Ajzenberg N, Berroeta C, Philip I, Grandchamp B, Ducellier P, Huart V, Verpillat P, Guillin MC, Benessiano J. Association of the −92C/G and 807C/T Polymorphisms of the α2Subunit Gene With Human Platelets α2β1Receptor Density. Arterioscler Thromb Vasc Biol 2005; 25:1756-60. [PMID: 15947241 DOI: 10.1161/01.atv.0000173308.13054.4f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Platelet adhesion to the subendothelial tissue via the collagen receptor alpha2beta1 is a crucial event in vascular biology. Although evidence has been provided that the number of platelets alpha2beta1 copies is genetically determined, the molecular change primary responsible has not been yet elucidated. The aim of our present study was to investigate the effect of combined polymorphisms within both regulatory (-52C/T and -92C/G) and coding regions (807C/T and 1648A/G) of the alpha2 subunit gene on human platelets alpha2beta1 receptor density and/or susceptibility to coronary artery disease (CAD). METHODS AND RESULTS Among 254 cardiac surgery patients, no evidence was found for an association between the alpha2 subunit gene polymorphisms and CAD. In contrast, in a subgroup of 113 patients, we observed a significant association between all polymorphisms except -52C/T and alpha2beta1 receptor level. Furthermore, when 3 groups of patients were defined according to the tertiles of platelets alpha2beta1 copies, the -92C/807T haplotype was more frequent in the group of patients with high alpha2beta1 receptor level. CONCLUSIONS These results suggest that an individual effect of each polymorphism located either in the coding or promoter sequence of the alpha2 gene may act in combination to modulate variations in platelets alpha2beta1 receptor density.
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Affiliation(s)
- Nadine Ajzenberg
- Departments of Hematology, Hopital Bichat, Assistance Publique-Hopitaux de Paris, France.
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