新的肿瘤抗原OVA12的生物学功能和致瘤机制研究
[Abstract]:Tumor antigen OVA12 is a new CT (cancer/testis) antigen selected from cDNA expression library of human ovarian cancer by SEREX (Serological analysis of recombinant cDNA expression library) method in our laboratory. Previous studies have shown that OVA12 antigen is highly expressed in various tumor tissues and tumor cell lines, but not expressed or low in normal tissues (except testis) and normal cell lines. After transfection of OVA12 gene into SMMC-7721 cells, cell proliferation rate is accelerated. The tumorigenic ability of nude mice was enhanced. The results show that OVA12 is closely related to the occurrence and development of tumor, so it has important theoretical significance and clinical application value to further study the biological function and mechanism of OVA12. In this study, we studied the following three aspects: (1) detect the expression of OVA12 in various normal and tumor cells and tissues from the mRNA and protein levels, and clarify the characteristics of OVA12 expression profile; The stable high expression and interfering cell line of OVA12 were constructed by virus infection, and the biological function of OVA12 in tumorigenesis and development was further studied by in vivo and in vitro experiments. The results showed that OVA12 was highly expressed in various tumor tissues and cell lines, but not expressed or low in normal tissues and cells. The results in vitro and in vivo confirmed that OVA12 could significantly promote or inhibit the proliferation and anti-apoptotic ability of tumor cells after high expression or interference. It can increase the drug resistance of tumor cells to 5-FU by upregulating the expression of Mcl-1 and survivin protein. The stable high expression of OVA12 and interfering cell lines were studied. The expression of signal molecules closely related to cell proliferation and apoptosis were detected. The results showed that the decreased expression of OVA12 could significantly increase the expression of p53 protein, while the high expression of OVA12 could inhibit the expression of p53 protein, but did not affect the level of p53 mRNA. Compared with the control group, p53 luciferase gene reporting system showed that the OVA12 interference cell line p53 transcription activity was significantly increased, while the transcription activity of OVA12 high expression cell line decreased significantly. OVA12 could regulate the K48 position polyubiquitin chain form of p53 protein. It can promote the degradation of p53 in proteasome and affect the sensitivity of tumor cells to cisplatin (which is dependent on p53 signaling pathway to induce apoptosis). The results suggest that OVA12 protein can negatively regulate p53 protein 3) by using specific p53 shRNA interference to block p53 signaling pathway, and CCK-8 and other related methods in vitro and in vivo were used to detect the effect of p53 protein expression on the biological function of OVA12. At the same time, the expression changes of several important proteins in the upstream of p53 signaling pathway were detected, and the mechanism of OVA12 regulating p53 signaling pathway was discussed. The results showed that the specific blocking of p53 signaling pathway in OVA12 interfering cell lines could effectively reverse the biological behaviors such as the decrease of cell proliferation induced by the decrease of OVA12 expression and G 1 / S phase arrest, compared with the control group. The results of tumorigenesis in nude mice in vivo and in vitro showed that the biological function of OVA12 depended on the p53 signaling pathway: OVA12 could affect the expression of tumor suppressor gene p14ARF and promote the output of MDM2 from nucleus to cytoplasm. Enhance the interaction between MDM2 and p53, accelerate the degradation of p53 protein. These results suggest that OVA12 protein is a characteristic high expression CT antigen in tumor tissues, which can promote the proliferation of tumor cells and inhibit cell apoptosis. The results suggest that OVA12 exerts its biological function through the mechanism of negative regulation of p53 signaling pathway.
【学位授予单位】:上海交通大学
【学位级别】:博士
【学位授予年份】:2015
【分类号】:R96
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