原癌基因Wip1在多形性胶质母细胞瘤及其细胞株中的表达及意义

背景与目的:近年来,相继发现Wip1在多种肿瘤中高表达,并能通过p38MAPK/p53信号通路对p53起负反馈调控,导致p53表达下降及诱导p53突变,与患者预后密切相关。本研究探讨野生型p53-诱导的蛋白磷酸酶1(the wild-type p53-induced phosphatase 1,Wip1)在人多形性胶质母细胞瘤及U87、U251细胞中表达及其临床意义。方法:应用免疫组织(细胞)化学、逆转录聚合酶链式反应(RT-PCR)和Western blot检测31例多形性胶质母细胞瘤及U87、U251细胞中Wip1蛋白和mRNA表达,选取10例正常脑组织作对照,回顾临床病理因素与Wip1表达的相关性。结果:免疫组织化学:多形性胶质母细胞瘤阳性表达率70.9%(22/31)高于正常脑组织的10.0%(1/10),差异有统计学意义(P<0.05);荧光显微镜观察U251细胞阳性表达率73%,U87细胞Wip1阳性表达率65%。RT-PCR:多形性胶质母细胞瘤Wip1 mRNA表达相对量(0.45±0.08)高于正常脑组织(0.11±0.03),差异有统计学意义(P<0.05),U87细胞Wip1 mRNA表达低于U251。Western blot:Wip1蛋白在多形性胶质母细胞瘤表达(1.63±0.19)高于正常脑组织表达(0.23±0.05),差异有统计学意义(P<0.05),U87细胞Wip1蛋白表达低于U251表达。Wip1表达与患者性别、肿瘤大小、年龄无关(P>0.05)。结论:Wip1在多形性胶质母细胞瘤及U87、U251细胞中高表达,可能与肿瘤恶性生长有关,Wip1有望成为恶性胶质瘤治疗新靶点。

The Expression of Proto-oncogene Wip1 in Human Glioblastoma Multiforme and Cell Lines

BACKGROUND & OBJECTIVE: Wild-type p53-induced phosphatase 1(Wip1) was identified as an oncogene amplified in various cancer types.In this study,we explored the expression of proto-oncogene Wip1 in glioblastomas,U87 and U251 cell line and its clinical significance.METHODS: Thirty-one glioblastomas,10 normal brain tissues,U87 and U251 cell line were detected for Wip1 mRNA and protein expression by the use of RT-PCR,immunohistochemistry,immunocytochemistry and western blot.Meanwhile,we reviewed the clinical da...