内皮型一氧化氮合酶基因G894T变异与超重和高血压的关系

目的 探讨内皮型一氧化氮合酶(eNOS)基因第7外显子G894T变异与超重在高血压患病中的意义。方法 在人群中筛检出未经药物系统治疗的116例高血压患者及136名血压正常者为研究对象;运用PCR-限制性片段长度多态性检测G894T变异;用相加模型分析G894T变异与超重之间的交互作用;用人群归因危险度百分比(PAR％)反映人群中的病因分值。结果 G894T变异与超重对高血压患病具有正交互作用;归因交互效应为1．99;归因交互效应百分比为30．76％;纯因子间归因交互效应百分比为36．38％。用多元logistic回归分析调整年龄、性别、吸烟指数及饮酒指数后,G894T变异与超重对高血压患病仍具有正交互作用。调整上述混杂因素后,归因交互效应为2．85;归因交互效应百分比为39．97％;纯因子间归因交互效应百分比为46．49％。在给定条件下计算的PAR％约为15％。结论 eNOS基因第7外显子G894T变异与超重之间的交互作用在该研究人群高血压患病中具有重要意义;在仅仅对具有G894T。变异与超重同时存在的部分人群中控制超重可明显降低一般人群高血压的患病率。

Relationship between mutation of exon G894 T of endothelial nitric oxide synthase gene and overweight to essential hypertension

Objective To explore the relationship between the 7th exon G894T mutation of endothelial nitric oxide synthase (eNOS) gene and overweight in patients with essential hypertension. Methods Totally, 116 patients with essential hypertension taking no medcications and 136 normotensives were selected from a steel workers as study subjects. Polymerase chain reaction and restriction fragment length polymorphism were performed to detect nutation of the 7th exon G894T. Additive model was used to analyze interaction between G894T mutation and overweight on hypertension. Population attributable risk percent (PAR%) for them, etiologic fraction, was applied to their contribution to hypertension. Results There was a positive interaction between G894T mutation and overweight on essential hypertension, with an index of interaction of 1.99 and attributable interaction percent of 30.76%. Their pure attributable interaction percent was 36.38%. Multiple logistic regression analysis showed that there still was positive interaction between G894T mutation and overweight on essential hypertension, adjusted for age, sex, smoking and alcohol drinking. Index of their attributable interaction was 2.85, with attributable interaction percent of 39.97%, also adjusted for the above-mentioned factors. Their pure attributable interaction percent was 46.49% and PAR% was estamated as about 15% under certain condition. Conclusions Interaction between nutation of the 7th exon G894T of eNOS gene and overweight played an important role in essential hypertension of the studied population. Control of body weight in the population with both G894T mutation and overweight could markedly decrease their risk of hypertension.