Wnt信号通路在食管癌细胞放射抗拒性形成中的作用

目的:研究Wnt信号通路在食管癌细胞放射抗拒性形成中的作用。方法:采用real-time RT-PCR检测Wnt通路mRNA的表达;Western blotting和免疫荧光检测Wnt通路蛋白的表达;动物成瘤实验比较细胞在体内的增殖和成瘤能力。结果:Wnt1表达上调引起Wnt通路激活,继而引起下游一系列的基因表达改变;β-连环蛋白(β-catenin)在细胞内蓄积,并向核内转移,调控的下游蛋白细胞周期蛋白D1(cyclin D1)和WISP1表达量增多;放射抗拒性的食管癌细胞在小鼠体内表现出更强的增殖和成瘤能力。结论:Wnt信号通路引起的细胞增殖加速可能是食管癌细胞放射抗拒性形成的重要原因。

Role of Wnt signaling pathway in development of radioresistance in esophageal cancer

AIM:To investigate the role of Wnt signaling pathway in the development of radioresistance in esophageal cancer cells. METHODS:The mRNA expression of the genes involved in Wnt signaling pathway was determined by real-time RT-PCR. The protein levels involved in Wnt signaling pathway were also confirmed by Western blotting and immunofluorescence method. Xenograft assay was performed to compare the proliferation ability and tumorigenicity of the cell lines. RESULTS:Up-regulation of Wnt1 induced the activation of Wnt signaling pathway and the variation of the downstream genes. β-catenin was accumulated and nuclear-transferred. The expression of downstream targeted genes such as cyclin D1 and WISP1 was increased. The radioresistant esophageal cancer cells showed higher proliferation ability and tumorigenicity in nude mouse xenograft. CONCLUSION:Wnt signaling-induced acceleration of proliferation is important for the development of radioresistance in esophageal cancer cells.