纤溶酶原激活物抑制剂-1启动子区域基因多态性与肺血栓栓塞症的相关性研究

目的探讨纤溶酶原激活物抑制剂-1（PAI-1）基因启动子区域-675位点单核苷酸缺失/插入（4G/5G）多态性与PTE发生的相关性.方法采用病例-对照研究,病例组为经放射性核素肺通气/灌注显像、螺旋CT肺动脉造影（CTPA）检查并结合临床资料确诊的PTE患者101例;对照组为来自PTE患者相同地区汉族人群,101例,性别、年龄相匹配.应用碘化钾-氯仿-异丙醇法提取基因组.联合应用聚合酶链反应（PCR）、变性高效液相色谱分析（DHPLC）和DNA直接测序分析PAI-1基因启动子区域的4G/5G多态性.结果PAI-1基因4G和5G等位基因频率在对照组分别为0.495和0.505,基因型分布符合Hardy-Weinberg平衡定律.4G4G、4G5G、5G5G基因型在PTE病例组分别为58（57.4%）、32（31.7%）、11（10.9%）;对照组分别为31（30.7%）、38（37.6%）、32（31.7%）,χ2=18.961,差别有统计学意义.病例组与对照组4G等位基因频率分别为0.733、0.495,5 G等位基因分别为0.267,0.505,χ^2=24.060,差别有统计学意义.单变量Logistic回归探讨PAI-1基因4G/5G与PTE的关系,4G4G＋4G5G、4G4G、4G5G的OR值分别为3.794（1.786-8.060）、5.443（2.416-12.260）、2.450（1.067-5.623）;P值分别为0.001、0.000、0.035.结论PAI-1启动子区域4G/5G、4G/4G基因型与PTE的发生有关,4G/5G、4G/4G基因型个体表现为更高的PTE危险性.

Relationship between polymorphisms of plasminogen activator inhibitor-1 promoter gene and pulmonary thromboembolism in Chinese Han population

OBJECTIVE: To determine the prevalence of polymorphisms in the plasminogen activator inhibitor-1 (PAI-1) promoter 4G/5G polymorphisms in Chinese Han population and to investigate whether they are associated with pulmonary thromboembolism (PTE). METHODS: Samples of peripheral venous blood were collected from 101 patients with PTE diagnosed by high probability of lung ventilation/perfusion scan and/or multi-slice CT pulmonary angiography (CTPA) as well as medical history and clinical manifestations, 67 males and 34 females, aged 48 +/- 15, and 101 age and sex-matched healthy controls from the same geographic area as controls. The genome DNA was extracted from the whole blood using potassium iodide-phenol-chloroform method. Polymerase chain reaction (PCR), denaturing high performance liquid chromatography (DHPLC), and sequence analysis were used to screen the single nucleotide polymorphisms and the genotype distribution of -675 4G/5G located in the promoter region of the PAI-1 gene. RESULTS: The frequencies of the allele 4G of PAI-1 gene in the controls were 0.495, significantly lower than in the PTE patients (0.733, chi(2) = 24.060, P < 0.01). The frequencies of the allele 5G of PAI-1 gene in the controls were 0.505, significantly higher than that in the PET patients. The genotype frequency of 4G4G of the PET patients was 57.4%, significantly higher than that of the controls (30.7%, P = 0.000). The genotype frequencies of 4G5G and 5G5G of the PET patients were 31.7% and 10.9% respectively, not significantly different from those of the controls (37.6 and 31.7% respectively). The presence of 4G allele of PAI-1 gene was found to be a greater risk factor for PTE. In comparison with the controls, the OR of 4G4G + 4G5G, 4G4G, and 4G5G in the PET patients were 3.794 (1.786 - 8.060), 5.443 (2.416 - 12.260), and 2.450 (1.067 - 5.623) respectively with the P values of 0.001, 0.000, and 0.035 respectively. CONCLUSION: The 4G/5G and 4G/4G genotypes are associated with the pathogenesis of PET.T.