磷脂酰肌醇3-激酶信号转导通路在胃肠道间质瘤中的表达及其意义

目的 研究磷脂酰肌醇3-激酶(PI3K/Akt)信号转导通路在胃肠道间质瘤(GIST)中的表达及其意义.方法 用RT-PCR检测PI3K、Akt和PTEN在124例GIST及瘤旁正常组织中的mRNA水平,Western印迹法检测PI3K、Akt和PTEN蛋白在GIST中的表达.结果在GIST中,随着NIH分级增高,PI3K和Akt的mRNA表达水平上调,低危组分别为0.90、0.53,中危组分别为0.88、0.58,高危组分别为0.97、0.58(P<0.05或P<0.01);而抑癌基因PTEN的mRNA表达水平下调,低危组为0.44,中危组为0.37,高危组为0.32(P<0.05或P<0.01).三者阳性表达率与性别、年龄、组织学类型无关,与肿瘤侵袭转移和黏膜受侵关系密切.PI3K与Akt蛋白阳性表达之间呈显著正相关(r=0.292,P:0.031);PI3K与PTEN蛋白阳性表达之间呈显著负相关(r=-0.412,P=0.036);PTEN与Akt蛋白阳性表达之间呈显著负相关(r=-0.386,P=0.024).结论 PI3K/Akt与PTEN在GIST的发生发展中可能互相拮抗、共同作用,可能是恶性肿瘤生长、侵袭、转移的重要指标.

PI3K/AKT signal transduction pathway in GISTs

Objective To investigate the significance of PI3K/AKT signal transduetion pathway in gastrointestinal stromal tumors(GIST).Methods The expression of PI3K、Akt、PTEN were detected with RT-PCR and Westem-blot of tumor specimens from 124 GIST cases and the corresponding normal gastric mucosa.Results In gastrointestinal stromal tumors,the tumor suppressor gene-PTEN was on low expression as with the inereased expression of PI3K and Akt.The positive expression rate of PTEN,PI3K and Akt was not statistically correlated with patients'demographics and tumor histological type,but they are significantly correlated with lymphatic metastasis and mucosal invasion.The expression of PI3 K and Akt are of significantly positive correlation(r=0.292,P=0.031).The expression of PI3K and PTEN are of significantly negetive correlation(r=-0.412,P=0.036).The expression of PTEN and Akt are of significantly negetive correlation(r=-0.386,P=0.024).Conclusion PI3 K/Akt and P,PTEN may have bean on reciprocally suppressive effect during the development of GIST.