受体酪氨酸激酶EphA7基因在胃癌中的表达及意义

Expression of receptor tyrosine kinase EphA7 in gastric carcinoma and its clinical significances

目的:基因是受体酪氨酸激酶(RTK)基因家族中最大的亚族。文中通过CpG岛高甲基化是导致EphA7基因在结直肠癌中表达下调的重要机制。检测EphA7基因mRNA在胃癌组织中的表达水平,探讨其对胃癌发生、发展及预后的意义。方法:利用荧光标记探针进行实时定量RT-PCR,测定62例胃癌患者的癌组织及癌旁非癌组织标本中EphA7 mRNA表达水平,结合临床病理学指标进行统计学处理,分析EphA7基因在胃癌组织和正常胃黏膜中表达水平与临床病理资料之间的关系。结果:EphA7基因表达水平在不同胃癌患者的癌组织标本和癌旁非癌胃黏膜中呈现差异性表达。根据EphA7在癌组织和癌旁非癌胃黏膜中的表达水平,可分为3种类型:正常黏膜/癌组织mRNA表达比值(N/T)(0.5为表达上调(22/62),(2为表达下调(27/62),介于0.5和2之间为表达无差异(13/62)。EphA7 mRNA表达与患者年龄有关(P=0.030),亦与肿瘤分期有关(P=0.031)。EphA7表达上调与肿瘤转移有一定的相关性(P=0.063)。结论:EphA7基因表达水平在不同的胃癌患者中有很大差异。EphA7基因表达上调可能在胃癌的发生和疾病进展中起一定作用。

Objective ： Eph is the largest member of the family of receptor tyrosine kinases （RTK）. Hypermethylation of CpG island is an important mechanism leading to down-regulation of EphA7 in gastric cancer. The objective of this study is to investigate the expression level of EphA7 in gastric carcinoma and its roles in the development, progression and prognosis of gastric carcinoma. Methods ： The expression level of EphA7 transcript in gastric carcinoma specimens and normal mucosa tissues was detected using real-time RT-PCR. Results： The expression level of EphA7 in gastric carcinoma was divided into three groups according to the expression rate in gastric cancer tissue and matched normal mucosa. Statistics analysis showed that the expression of EphA7 is significantly related to age and stage. Overexpression of EphA7 has a tendency to relate to metastasis. Conclusion： EphA7 is differentially expressed in gastric carcinoma specimens. Overexpression of EphA7 may play a role in the development and progress of gastric carcinoma.