血小板膜糖蛋白Ⅱb与脑梗死的关系

目的探讨湛江地区汉族人群脑梗死发生与血小板糖蛋白(glycoprotein,GP)Ⅱb的关系.方法采用病例-对照研究,应用聚合酶链反应-限制性酶切片断长度多态性分析方法(polymerasechain reaction-restrictionfragmentlength polymorphism,PCR-RFLP)方法检测血小板GPⅡb HPA-3基因多态性,流式细胞仪检测GPⅡb(CD41)受体的表达.结果脑梗死组HPA-3 b等位基因的频率高于对照组(0.6310.551 P＜0.005);脑梗死组GPⅡb平均表达百分数较对照组增高[(24.27±12.33)(13.49±8.76),P＜0.05)],2组中携带HPA-3b等位基因者GPⅡb受体表达较非携带HPA-3b者增高,差异有显著性(P＜0.05).Logistic多因素回归分析显示血小板膜GPⅡb HPA-3b等位基因为脑梗死发生的独立危险因素(P＜0.05,OR=2.885,95%CI1.135～8.307).结论血小板膜GPⅡb基因多态性影响GPⅡb受体的表达且与脑梗死的发生相关联,GPⅡb可能为脑梗死发生的1种遗传易感性标志.     

血小板膜糖蛋白IIb与脑梗死的关系

目的探讨湛江地区汉族人群脑梗死发生与血小板糖蛋白(glycoprotein,GP)IIb的关系。方法采用病例-对照研究,应用聚合酶链反应-限制性酶切片断长度多态性分析方法(polymerasechainreaction-restrictionfragmentlengthpolymorphism,PCR-RFLP)方法检测血小板GPIIbHPA-3基因多态性,流式细胞仪检测GPIIb(CD41)受体的表达。结果脑梗死组HPA-3b等位基因的频率高于对照组(0.631∶0.551P<0.005);脑梗死组GPIIb平均表达百分数较对照组增高[(24.27±12.33)∶(13.49±8.76),P<0.05)],2组中携带HPA-3b等位基因者GPIIb受体表达较非携带HPA-3b者增高,差异有显著性(P<0.05)。Logistic多因素回归分析显示血小板膜GPIIbHPA-3b等位基因为脑梗死发生的独立危险因素(P<0.05,OR=2.885,95%CI:1.135～8.307)。结论血小板膜GPIIb基因多态性影响GPIIb受体的表达且与脑梗死的发生相关联,GPIIb可能为脑梗死发生的1种遗传易感性标志。     

血小板膜糖蛋白受体P2Y12基因多态性与缺血性卒中的相关性研究

目的探讨血小板膜糖蛋白受体P2Y12基因-T744C位点多态性与缺血性卒中的相关性。方法采用聚合酶链反应——限制性片段长度多态性分析法检测165例缺血性卒中患者和152例对照组血小板膜糖蛋白受体P2Y12基因型。结果病例组和对照组间性别构成、年龄比较差异均无统计学意义(掊2=0.043,t=-1.86,P﹥0.05),病例组和对照组间高血压、糖尿病、高脂血症比较差异均有统计学意义(掊2=15.47,掊2=10.29,掊2=9.17,P﹤0.05或者P﹤0.01)。病例组TC/CC型基因频率(43.61%)明显高于对照组的(28.95%),差异有统计学意义(掊2=4.73,P﹤0.05)。C等位基因的频率病例组(22.03%)也明显高于对照组的(15.46%),且差异有统计学意义(掊2=5.80,P﹤0.05)。结论血小板膜糖蛋白受体P2Y12基因-T744C位点TC/CC型可能是缺血性卒中的易感危险因素之一。     

GpⅡb-Ⅲa复合体的基因多态性与动脉硬化性脑血栓形成的相关性研究

目的:探索血小板糖蛋白(glycoprotein,Gp)ⅡbⅢa复合体的基因多态性是否与动脉硬化性脑血栓形成有关。方法:GpⅡb组病例122例,对照组99例,GpⅢa组病例127例,对照组104例,提取空腹静脉血白细胞中DNA,经聚合酶链反应(PCR)后,分别用限制性内切酶FokⅠ、ScrFⅠ酶切,2.2%琼脂糖凝胶电泳,紫外分析仪观察。数据统计应用SPSS11.5forWindows统计软件包。结果:GpⅡb组中≤70岁的人GpⅡbSer843等位基因的纯合子型与增加动脉硬化性脑血栓形成的危险相关(P=0.029);将病例组和对照组中的男性,按照基因型bb组和(aa ab)组进行分析,结果显示两组间有显著差异(P=0.01,OR=2.194,95%CI=1.177～4.091);GpⅢa组共231例均为GpⅢaPlA1基因型。结论:在动脉硬化性脑血栓形成中有GpⅡbIle/Ser843的基因多态性异常;而GpⅢaPlA1基因型无异常。     

脑血栓形成与亚甲基四氢叶酸还原酶基因多态性的关系

目的　探讨中国汉族人群脑血栓形成与亚甲基四氢叶酸还原酶 (MTHFR)基因多态性及血浆同型半胱氨酸 (Hcy)水平的关系。 方法　利用聚合酶链反应 限制性内切酶长度多态性 (PCR RFLP)方法分析脑血栓形成患者 (75例 )与健康人群 (62名 )的MTHFR基因突变的情况。采用高效液相色谱法测定血浆Hcy水平 ,并加以对照分析。 结果　脑血栓形成组与对照组MTHFR基因型频率CC、CT、TT型分别为 0 41、0 35、0 2 4及 0 58、0 2 3、0 1 9,两组相比差异无显著意义 (P =0 1 37)。患者组与对照组MTHFR的T等位基因频率分别为 0 41和 0 31 ,两组相比差异无显著意义 (P =0 0 67)。脑血栓形成组与对照组血浆Hcy水平分别为 (1 8 3± 7 2 ) μmol/L与 (1 3 6± 5 8)μmol/L ,二者比较差异有显著意义 (P <0 0 0 1 )。两组中MTHFR基因TT型者Hcy水平与CC型比较差异有显著意义 (P <0 0 5) ,Hcy水平与叶酸呈负相关 (患者组 :r =- 0 31 ,P <0 0 1 ;对照组 :r =- 0 2 8,P <0 0 5)。结论　血浆Hcy水平升高是脑血栓形成的危险因素之一 ,MTHFR基因突变可能是血浆Hcy升高的主要影响因素     

脑血栓与凝血因子Ⅸ基因多态性的相关性研究

目的探讨凝血因子Ⅸ基因在第六外显子23384-23387bp存在的单核苷酸多态性与脑血栓的相关性。方法应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)的方法,检测长春地区323例脑血栓患者及300例正常健康对照组凝血因子Ⅸ基因多态性分布。结果MnⅡ酶切后,其中脑血栓4例患者为G基因表达,319例患者为A基因表达。正常健康对照组中2例为G基因表达,298例患者为A基因表达。无统计学意义。结论在这一基因位点脑血栓患者和正常健康人群基因多态性主要为A型。对此可以认为凝血因子Ⅸ基因多态性不是血栓形成的危险因子。     

NF-κB1基因启动子-94ins/del ATTG的基因多态性与动脉粥样硬化性脑梗死的关系

目的探讨核因子κB1(NF-κB1)基因启动子-94ins/del ATTG基因多态性与动脉粥样硬化性脑梗死(ACI)的关系。方法采用PCR限制性片段长度多态性分析(PCR-RFLP)法检测191例ACI患者(其中中国东北地区ACI患者101例,湖北省ACI患者90例)和171名健康对照(其中东北地区90名,湖北省81名)的NF-κB 1基因启动子-94ins/del ATTG基因型,分析该基因多态性与ACI的关系。结果 ACI组患者的NF-κB1-94ins/del ATTG 2种基因型频率(WW和DD型)和2种等位基因频率(W和D型)与健康对照者间比较有统计学差异(P<0.01);东北地区健康对照组与东北ACI组DD基因型频率和等位基因频率(W和D型)存在统计学差异(P<0.05),湖北地区健康对照组与ACI组WW、DD基因型频率和等位基因频率(W和D型)存在统计学差异(P<0.05),两地区健康对照组之间比较以及ACI组间比较均无统计学差异(P>0.05)。结论 NF-κB1基因启动子-94ins/del ATTG基因多态性与ACI发病有一定相关性,但其相关性不存在地区差异。     

脑源性神经营养因子基因多态性与散发性帕金森病的相关性研究

目的探讨脑源性神经营养因子(Brain-DerivedNeurotrophicFactor,BDNF)基因多态性与散发性帕金森病(SporadicParkinson'sDisease,SPD)的相关性。方法采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)分析方法对196例健康人和85例SPD患者进行基因分型;利用x2检验统计分析实验数据。结果两组间BDNF基因G196A和C270T多态性位点各基因型和等位基因频率差异均无显著性(P>0.05)。结论BDNF基因多态性与SPD无显著相关性。     

偏头痛与5-羟色胺转运体基因多态性的相关性研究

目的研究5-羟色胺转运体(5-hydroxytryptamine transporter,5-HTT)基因多态性频率在汉族偏头痛人群的分布,探讨该基因多态性与偏头痛的相关性。方法采集40例偏头痛患者(实验组)和40例健康成人(对照组)的肘静脉血,通过DNA-PCR扩增等分子生物学技术,观察5-HTT基因多态性的基因型和等位基因频率在两组中的分布特点。结果5-HTT基因多态性的基因型和等位基因频率在实验组和对照组中的分布无统计学差异(P>0.05),在偏头痛各临床特征中的分布也无统计学差异(P>0.05)。结论5-HTT基因是否在汉族人群偏头痛发病中起作用,有待进一步研究。     

P-选择素基因S290N和P-选择素糖蛋白配体-1基因M62I多态性与缺血性脑梗死临床关联性研究

目的探讨P-选择素(SELP)基因S290N和P-选择素糖蛋白配体-1(PSGL-1)基因M62I多态性与缺血性脑梗死的关系。方法选取148例缺血性脑梗死患者作为脑梗死组,并分为大动脉粥样硬化性(LAA)亚组、心源性脑栓塞(CE)亚组和小动脉闭塞性(SAO)亚组;88例正常人群作为正常对照组。运用基因测序方法检测所有受试者SELP基因S290N和PSGL-1基因M62I的基因多态性。结果与正常对照组比较,脑梗死组及其亚组S290N基因型和等位基因频率差异无统计学意义(均P0.05);脑梗死组M62I基因型和等位基因频率差异有统计学意义(均P0.01);LAA亚组M62I基因型差异无统计学意义(χ~2=5.889,P=0.053),但等位基因频率差异有统计学意义(χ~2=6.156,P=0.021);CE亚组基因型和等位基因频率差异均无统计学意义(χ~2=1.693,P=0.429;χ~2=1.372,P=0.238);SAO亚组基因型和等位基因频率差异均有统计学意义(χ~2=12.572,P=0.002;χ~2=8.736,P=0.004)。S290N与缺血性脑梗死风险无相关性(均P0.05)。M62I显性模型和超显性模型与缺血性脑梗死风险有相关性(OR=2.662,95%CI:1.531~4.630,P=0.000;OR=0.392,95%CI:0.219~0.701,P=0.001),而隐性模型和加性模型与缺血性脑梗死风险无相关性(OR=1.428,95%CI:0.528~3.862,P=0.630;OR=2.121,95%CI:0.766~5.872,P=0.156)。结论 PSGL-1基因M62I多态性与缺血性脑梗死之间具有相关性。     

HPA-1 and HPA-3 polymorphisms of the platelet fibrinogen receptor and coronary artery disease and myocardial infarction

Platelet fibrinogen receptor (glycoprotein [GP] IIb/IIIa) plays a fundamental role in atherothrombosis. The human platelet antigen (HPA) -1 and the HPA-3 are the most extensively studied polymorphisms of GPIIIa and GPIIb, respectively. This study was designed to test, in a large population, the hypothesis that these polymorphisms represent a risk factor for the occurrence of coronary artery disease (CAD) and myocardial infarction (MI). Consecutive, angiographically examined patients with significant coronary stenoses but without symptoms or signs of old or acute MI constituted the group with CAD (CAD, n = 998) and those with old or acute MI constituted the group with MI (MI, n = 793). As controls served subjects, matched with patients for age and sex, with neither angiographic CAD nor symptoms or signs of MI (matched controls [MC], n = 340) as well as a group of blood donors without cardiac symptoms or signs of CAD (BD, n = 104). Genotype distribution was similar across the groups; HPA-1a/a: HPA-1a/b: HPA-1b/b was 75.0%: 22.1%: 2.9% in BD, 72.6%: 24.7%: 2.6% in MC, 70.5%: 26.8%: 2.7% in CAD, and 70.7%: 26.4%: 2.9% in MI; HPA-3a/a: HPA-3a/b: HPA-3b/b was 39.4%: 40.4%: 20.2% in BD, 33.5%: 50.0%: 16.5% in MC, 35.0%: 46.4%: 17.0% in CAD, and 37.1%: 48.0%: 16.5% in MI. There was no interaction between these polymorphisms, nor between each of these polymorphisms and other risk factors. Thus, the HPA-1 and HPA-3 polymorphisms are neither separately nor in concert associated with any measurable increase of the risk for CAD or MI in angiographically evaluated subjects.     

Association of the platelet glycoprotein IIb HPA-3 polymorphism with survival after acute ischemic stroke

BACKGROUND AND PURPOSE: The role of polymorphisms of the platelet glycoprotein (GP) IIb/IIIa receptor in the development of cardiovascular disease has been the subject of intensive research. The aim of this study was to determine the association of the HPA-3 polymorphism of platelet GPIIb with ischemic stroke and subsequent survival and to identify possible interactions of HPA-3 with classic risk factors. METHODS: HPA-3 genotype was determined by restriction fragment length polymorphism in 515 patients with ischemic stroke and 423 healthy, age-matched control subjects. RESULTS: There was no significant difference in the genotype distribution of patients and controls, nor was there any difference when patients were subclassified into small- and large-vessel disease. The genotype distribution of the 231 patients subsequently dying during 2.8 years of follow-up (aa=45.0%, ab=46.8%, bb=8.2%) was significantly different from that of those still alive (aa=37.0%, ab=48.2%, bb=14. 8%) (P=0.03). In a Cox regression model, the relative risks for poststroke mortality in patients of aa and ab genotype compared with those of bb genotype were 2.42 (95% CI, 1.24 to 4.71) and 2.13 (95% CI, 1.09 to 4.17), respectively, after we accounted for confounding factors. In addition, significant interactions of HPA-3 with the Pl(A) polymorphism of GPIIIa (P=0.002) and with fibrinogen (P=0.01) were identified in relation to mortality. CONCLUSIONS: HPA-3 is related to poststroke mortality, and the significant interaction of HPA-3 with Pl(A) and fibrinogen suggests that it may in some way influence the interaction of GPIIb/IIIa with fibrinogen, particularly in the presence of high fibrinogen.     

A common polymorphism flanking the ATG initiator codon of GPIb alpha does not affect expression and is not a major risk factor for arterial thrombosis

The platelet membrane glycoprotein (GP) Ib alpha plays a key role in the initial formation of thrombi. Polymorphisms (VNTR and HPA-2) in this receptor are associated with increased risk of coronary heart disease (CHD) and cerebral vascular disease (CVD). We investigated whether a recently described polymorphism (S/R), due to a single base change (T-->C) five nucleotides upstream the initiator codon of GPIb alpha, might influence the expression of the protein, and be implicated in the development of arterial thrombosis. One hundred and thirty nine healthy individuals provided blood samples for DNA analysis of platelet GPIb alpha polymorphisms, and for flow cytometric analysis of the surface expression of the receptor. A group of 20 S/R normal individuals and an identical number of S/S participants, age and sex matched, was investigated for the analysis of the density of various platelet receptors. The distribution of the S/R polymorphism was also analyzed in two case/control studies including 104 CVD patients, 101 CHD patients, and one control age, sex, and environmental risk factors matched for each case patient. Surface density of GPIb alpha showed no wide variations between individuals, was not influenced by the presence of S or R alleles, nor associated with the VNTR or HPA-2 polymorphisms. The prevalence of the S/R genotype among CVD and CHD patients was not distinct from that in the control groups. We conclude that the S/R polymorphism of GPIb alpha, flanking the initiator codon of the receptor, does not seem to be associated with surface levels of the protein, and is not an independent risk factor for arterial thrombosis.     

脂蛋白脂酶Ser447Stop基因多态与脑梗死的相关性

目的 探讨脂蛋白脂酶(LPL)Ser447Stop基因多态与脑梗死的相关性.方法 受试者共883人,其中脑梗死组563例[包括动脉粥样硬化(AS)性脑梗死329例和腔隙性脑梗死234例],对照组320名,应用聚合酶链反应一限制性片段长度多态性方法,对LPL基因Ser447Stop位点进行基因多态性检测.结果 脑梗死组、AS性脑梗死组和腔隙性脑梗死组LPL Ser447Stop GG+CG基因型频率与对照组相比,差异无统计学意义,AS性脑梗死组G变异等位基因频率(64例,9.7%)与对照组(42例,6.6%)相比差异有统计学意义(X2=3.99,P=0.045).相对于C等位基因,G等位基因的彻值为1.510(95%C/1.012～2.261).结论 LPL Ser447Stop G变异等位基因携带者患AS性脑梗死的危险高于非携带者.G变异等位基因可能是AS性脑梗死高危险性的遗传标志之一.     

血小板膜糖蛋白Ibα基因启动子上游"Kozak"多态性与脑梗死的相关性研究

目的研究中国雷州半岛地区汉族人群血小板膜糖蛋白(GP)Ibα基因ATG启动子上游25bp处"Koza"多态性位点与脑梗死的关系.方法采用病例-对照研究,选择中国雷州半岛地区汉族人群130例健康体检者(对照组)和148例经CT或MRI证实的脑梗死患者(CI组)为对象,用聚合酶链反应-限制性酶切片段长度多态性分析方法(PCR-RFLP)检测血小板膜糖蛋白(GP)Ib Kozak-5T/C序列基因多态性,分析其在正常人群及脑梗死患者中的频率分布特点及与缺血性脑卒中的关系.结果CI组GPIb Kozak序列C等位基因频率为0.487,对照组为0.396,两组比较差异有显著性(P＜0.05);-5C基因纯合子携带者发生脑梗死的风险是T/T或T/C基因携带者的2.0倍,经Logistic回归分析校正了年龄、血压、血脂等危险因素后,-5C纯合子与脑梗死仍密切相关(P＜0.05,OR=2.885,95%CI1.135-8.307).结论中国雷州半岛地区汉族人群GPIb Kozak序列-5T/C基因多态是脑梗死的遗传易感因素.     

Platelet membrane glycoprotein polymorphisms do not influence the clinical expressivity of von Willebrand disease type 1

Von Willebrand disease (VWD) is characterized by a significant variation in bleeding symptoms among patients with similar laboratory profiles and equivalent plasma levels of von Willebrand factor (VWF) activities. Considering the recent suggestion that platelet membrane glycoprotein polymorphisms (PltGPs) may play a role as modulators of thromboembolic or haemorrhagic diseases, we investigated the role of different PltGPs and GPVI content in the clinical expression of patients with VWD type 1.The diagnosis of VWD (n = 76) was based on laboratory findings (VWF:Ag, VWF:RCo, VWF:CB, FVIII:C, and multimer analysis), family and personal history of bleeding. All patients were interviewed using a standardized questionnaire, and classified into two categories: bleeders (unequivocal bleeding tendency, n = 53) and non bleeders (absence of bleeding symptoms, n = 23). PltGPs, HPA-1, 2 and 5 and C807T of GPIa were determined by fluorophore-labelled hybridization probes on a LightCycler. GPVI content was measured by western blotting. VWF:Ag,VWF:RCo,VWF:CB and FVIII:C levels were not significantly different between symptomatic and asymptomatic patients. There were no differences in the genotype distribution and allele frequencies between bleeders and non bleeders for the platelet alloantigen systems HPA-1, 2, 5 and the GPIa C807T polymorphism. The levels of platelet GPVI were similar in symptomatic and asymptomatic VWD patients (109.6 +/- 58.4 vs 114.1 +/- 52.5, respectively; p: 0.77). These results show that PltGPs HPA-1, 2 and 5 or the C807T dimorphism of GPIa do not influence the clinical expressivity of VWD type 1. The wide variation in GPVI content was not associated with the severity of bleeding in the patients. Other genetic factors that may contribute to the variable expressivity of VWD type 1 should be investigated.     

ABCB1基因多态性与中国汉族人群动脉粥样硬化性血栓性脑梗死的相关性研究

目的探讨ATP结合盒B亚家族成员1转运蛋白(ABCB1)基因多态性与中国汉族人群动脉粥样硬化性血栓性脑梗死(ATCI)患者的关系。方法选取392例ATCI患者(脑梗死组)和429例健康对照者(对照组),通过SNa Pshot方法对ABCB1基因的rs1128503和rs1045642位点进行SNP检测。比较两组的基因型和等位基因分布频率,分析基因型与临床表型的关系。结果脑梗死组rs1128503和rs1045642位点的基因型及等位基因分布频率与对照组比较,无统计学意义(P0.05)。女性ATCI患者的rs1128503位点TT基因型和CC基因型体重指数高于TC基因型(P=0.007,P=0.011)。女性ATCI患者的rs1045642位点CC基因型低密度脂蛋白-胆固醇水平高于CT基因型(P=0.030)。结论 ABCB1基因多态性与中国汉族人群ATCI的发病无明显相关性。rs1128503位点多态性可能与女性ATCI患者的体重指数有关,rs1045642位点多态性可能与女性ATCI患者的低密度脂蛋白-胆固醇水平有关。     

TAFI gene polymorphisms in patients with cerebral venous thrombosis

Gene polymorphisms of thrombin activatable fibrinolysis inhibition (TAFI) factor have been investigated in various studies in terms of etiology (recurrence) and treatment (fibrinolytic effect) of thrombus formation. Cerebral venous thrombosis (CVT) is a life-threatening disease observed in young persons. Fifty-nine patients with CVT and 100 healthy control subjects were enrolled in the case/control study. The association between TAFI gene polymorphisms ?438G>A, +505A>G and +1040C>T and cerebral venous thrombosis was investigated. It was found that frequencies of polymorphic genotype and allele were not different in patients than in control group and that they were not significant for cerebral venous thrombosis.     

Platelet glycoprotein Ibalpha polymorphisms modulate the risk for myocardial infarction

Platelet glycoprotein Iba (GPIba) gene polymorphisms have been reported to affect the risk of developing coronary heart disease. Here, within the GPIba gene, we determine the association between the variable number of tandem repeats (VNTR), the -5C/T Kozak sequence dimorphism, and the human platelet antigen (HPA)-2 polymorphisms with occurrence of myocardial infarction (MI). Patients (n=180) presenting survivors of MI were compared to 180 controls matched by age, gender, and race. Carriers of VNTR-CD genotype had a 2-fold higher risk for MI compared to controls. The prevalence of VNTR-BC was lower among patients than among controls (P=.007). These data are in agreement with recent reports of increased plug formation by human platelets containing VNTRCD but no other VNTR genotypes. Among patients, the number of vessels severely occluded was greater among carriers of the D-allele (P=.019) or VNTR-CD (P=.026) and lower among carriers of the C-allele (P=.003) or VNTR-CC (P=.0009) compared to non-carriers of these alleles. No influence was seen with the Kozak or HPA-2 polymorphisms. Determination of VNTR of the GPIba gene may prove useful for identifying high-risk individuals for MI.     

肿瘤坏死因子超家族成员4基因SNP rs3861950与脑梗死

目的 探讨肿瘤坏死因子超家族成员4(TNFSF4)基因SNP rs3861950与本地区脑梗死发病的关系.方法 采用TaqMan-PCR方法检测TNFSF4基因SNP rs3861950基因型与等位基因频率.湖南籍汉族脑梗死共287例,对照组为湖南籍汉族健康体检者共285名.结果 脑梗死组CC基因型(7.7%)分布与对照组(2.1%)相比,差异具有统计学意义(X2=9.553,P=0.008);C等位基因频率脑梗死组(0.190)高于对照组(0.137,X2=5.887,P=0.015).动脉血栓性脑梗死亚组与对照组比较其基因型(X2=9.396,P=0.009)及等位基因频率(X2=6.134,P=0.013)差异均有统计学意义.非条件Logistic多因素回归分析显示CC基因型使脑梗死发病的风险是其他危险因素的3.7倍(P=0.002,OR 3.706).结论 TNFSF4基因rs3861950 C→T与湖南籍汉族脑梗死发病相关,尤其与动脉血栓性脑梗死发病相关,rs3861950 C等位基因可能是湖南籍汉族脑梗死发病的独立危险因素.