中文摘要：

目的：探讨野生型p53对Wnt通路的调节以及对肺癌细胞生物学行为的影响。方法：分别利用野生型p53质粒及siRNA,分别转染和干扰A549细胞中的野生型p53,而后用Western blot检测A549细胞中β-catenin和cyclin D1的表达,用荧光素酶报告基因法检测Wnt通路活性,用MTT和Transwell实验检测A549细胞的增殖和侵袭能力。结果：转染野生型p53后能够明显下调A549细胞中β-catenin和cyclin D1表达（P〈0.01）,抑制肺癌细胞的增殖和侵袭（P〈0.05）,而干扰p53可以明显地上调β-catenin和cyclin D1表达（P〈0.01）,增强肺癌细胞的增殖力和侵袭力（P〈0.05）。结论：野生型p53负向调控A549细胞中的Wnt信号转导通路,抑制其增殖和侵袭能力。

英文摘要：

Objective：p53 is one of the most important tumor suppressors, the regulation of wild - type p53 on Wnt pathway in lung cancer cells is still not clear, we explore the wild type p53 function on Wnt pathway and lung cancer cell biology behaviors. Methods ： Wild - type p53 plasmid and siRNA were used to transfect and knock down p53 in A549 cells,Western blot was used to detect β -catenin and cyclin D1 protein level, luciferase reporter gene was used to detect the activity of the Wnt pathway, MT/＇ and Transwell assay were used to detect the proliferation and invasion of A549 cells. Results： The transfection of wild - type p53 markedly reduced β - catenin and cyclin D1 in A549 cells （ P 〈0.01 ） and inhibited the proliferation and invasion （P 〈0.05 ） ,knock down of p53 up - regulated β - catenin and cyclin D1 （ P 〈 0.01 ）, and enhanced proliferation and invasion in A549 cells （ P 〈 0.05 ）. Conclusion： The wild -type p53 negatively regulates Wnt signaling transduction pathway and inhibits the proliferation and invasion of A549 cells.