胃癌高发区IL-1基因多态性、H.pylori感染和胃黏膜萎缩关系的研究

目的:分析胃癌高发区普通人群的IL-1B-511基因多态性、H.pylori感染率及胃粘膜萎缩的血清学指标(血清胃蛋白酶原I(pepsinogenI,PGI)、胃蛋白酶原I/胃蛋白酶原II的比值(PGI/PGII)和胃泌素(gastrin)浓度,探讨IL-1B-511基因多态性对幽门螺旋杆菌(Helicobacterpylori,Hp)感染后胃黏膜萎缩的影响。以期进一步明确IL-1B基因多态性与胃黏膜萎缩关系,IL-1B基因多态性增加胃癌发病危险性的可能机理。方法:采用PCR-限制性长度片段多态性(RFLP)分析法检测胃癌高发区陕西省普通人群169例的基因型。采用酶联免疫吸附法(ELISA)检测上述人群的Hp感染率、PGI、PGII和Gastrin的浓度。结果:在胃癌高发区,Hp阳性者PGI/PGII显著低于Hp阴性者(P<0.01),但1L-1B-511T/T基因型人群PGI/PGII与1L-1B-511C/T和C/C基因型者无显著差异(P值均>0.05)。血清胃泌素浓度与IL-1B-511的基因型没有明确的关系(P>0.05)。结论:在胃癌高发区,Hp感染可能在20~23岁年龄段已是胃黏膜萎缩的危险因素,1L-1B-511T/T基因型者可能增加Hp后胃黏膜萎缩形成的危险性;胃黏膜萎缩的发生、发展除与Hp感染和遗传有关外,环境因素可能起相当重要的作用。

The relation between H. pylori infection, Interleukin -1B gene polymorphism and musolar atrophy in high prevalence region of gastric cancer

Objective:To investigate the relation between interleukin-1B gene polymorphism,Hpinfection and musolar atrophy. Methods: IL-1B gene polymorphism of common people in high prevalence region of gastric cancer were analyzed by PCR-RFLP,the Hp infection rate, PG I/ II ratio and gastrin were examined using ELISA or RIA. Results: People with Hp infection have higher PG I level, but lower PG I/PG II ratio, compared with individuals without Hp infection.PG I was similar among each genotype not only in IL-1B-511 locus. the gastrin level was similar among each genotype in IL-1B-511 locus no matter whether Hp infected or not. Conclusion: In high prevalence region, of gasteic cancer IL-1B-511 T/T genotype is a risk factor for musolar atrophy after Hp infection. Environmental factor is a more important factor besiedes Hp infection and Heredity.