CUL4A通過調(diào)控Hippo通路促胃癌細(xì)胞增殖和侵襲的分子機(jī)制
[Abstract]:Objective: to investigate the mechanism and clinical significance of CUL4A in gastric cancer. Methods: the expression of CUL4A was detected by immunohistochemistry in 124 cases of gastric cancer, and the relationship between the expression level and clinicopathological features and survival time of gastric cancer was analyzed. The effects of overexpression and interference of CUL4A on the proliferation, invasion and EMT of gastric cancer cells were observed, and the effects of interfering CUL4A on the proliferation of gastric cancer cells were verified in nude mice. Real-time quantitative PCR, immunofluorescence and protein immunoprecipitation were used to investigate the molecular mechanism of inactivated LATS1-Hippo pathway of CUL4A, luciferase reporter gene and other methods were used to investigate the targeting regulation of CUL4A by miR-9 and miR-137. Finally, the role and clinical significance of miRNAs-CUL4A-LATS1-Hippo regulatory axis in gastric cancer cells were verified in vitro and fresh gastric cancer tissues. Results: immunohistochemical results showed that the expression of CUL4A protein was closely related to the TNM stage (P0.025) and lymph node metastasis (P0. 003) of gastric cancer patients. The high expression of CUL4A protein could predict the poor prognosis of gastric cancer patients (P0. 026). Overexpression of CUL4A promoted the proliferation, invasion and EMTof gastric cancer cells, while interfering with CUL4A inhibited the proliferation, invasion and EMTof gastric cancer cells. Overexpression of CUL4A decreased the expression of LATS1 and p-YAP, but did not affect the expression of MST1/2, promoted the entry of YAP into the nucleus, interfered with the expression of CUL4A, and significantly inhibited the transcription of YAP related target genes. The results of immunoprecipitation showed that CUL4A combined with LATS1 protein. The up-regulated expression of miR-9 and miR-137 inhibited the proliferation and invasion of gastric cancer cells, down-regulated the expression of CUL4A protein, but did not affect the expression of CUL4A mRNA. The results of luciferase reporter gene showed that miR-9 and miR-137 regulated CUL4A expression. Moreover, miR-137 and miR-9 regulated the Hippo pathway through targeting CUL4A, and overexpression of CUL4A partially reversed the inhibitory effect of miR-9 and miR-137 on proliferation and invasion of gastric cancer cells. The expression levels of miR-9 and miR-137 were negatively correlated with the expression of CUL4A and YAP in gastric carcinoma. Conclusion the imbalance of the axis regulated by 1: miR-9 / 137-CUL4A-LATS1-Hippo is involved in the malignant progression of gastric cancer cells. CUL4A may be a potential molecular target for the treatment of gastric cancer.
【學(xué)位授予單位】:南昌大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R735.2
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