白细胞介素1B基因启动子区-511位点C/T基因多态性与冠心病严重程度的相关性

目的探讨白细胞介素1B(interleukin1B,IL1B)基因启动子区-511位点C/T基因多态性与冠心病(coronary heart disease,CHD)严重程度的相关性。方法采用聚合酶链反应-限制性片段长度多态性分析的方法,检测127例CHD患者和152名对照组的IL1B-511位点C/T基因型;采用酶法测定血脂各项水平。结果IL1B-511位点C/T基因多态性在急性冠脉综合征(acute coronary syndrome,ACS)组和对照组间的分布差异存在统计学意义(χ2=5.72,P<0.01),CT及TT基因型患者患ACS的相对风险度约是CC基因型的2.56倍(比值比=2.56,95%可信区间=1.17~5.59);CHD组中,携带T等位基因的患者血清总胆固醇(6.09±0.97)mmol/L及低密度脂蛋白-胆固醇(3.97±0.92)mmol/L水平显著高于其他患者(5.12±0.56)mmol/L及(2.87±0.71)mmol/L(P<0.05)。结论IL1B-511位点C/T基因多态性与CHD的严重程度存在相关,其机理可能是该位点DNA变异影响了IL1B的分泌加重了炎症的反应及血脂紊乱。

The correlation between polymorphism at position -511C/T in the promoter region of interleukin 1B and the severity of coronary heart disease

OBJECTIVE: To investigate the correlation between polymorphism at position -511C/T in the promoter region of interleukin 1B (IL1B) and the severity of coronary heart disease (CHD). METHODS: The polymerase chain reaction-restriction fragment length polymorphism technique was applied to analyze the polymorphisms of IL1B -511C/T in 127 patients with CHD and 152 controls. And the serum level of lipoproteins was detected by enzymology method. RESULTS: The distribution of IL1B -511C/T polymorphism between acute coronary syndrome (ACS) patients and controls was significantly different (chi-square test=5.72, P<0.01). CT and TT genotype carriers were in increased risk of ACS with more double ratio to CC genotype (OR=2.56, 95%CI=1.17-5.59). In CHD group, total cholesterol and low density lipoprotein-cholesterol levels of patients with CT and TT genotypes (6.09+/-0.97 mmol/L and 3.97+/-0.92 mmol/L) were significantly higher than those of patients with CC genotype (5.12+/-0.56 mmol/L and 2.87+/-0.71 mmol/L, P<0.05). CONCLUSION: The polymorphism at position -511C/T in IL1B is associated with the severity of CHD, and the DNA variation at this position may affect the secretion of IL1B, and aggravate the reaction of inflammation and dyslipoidemia.