轉(zhuǎn)人B7-H3基因鱗癌細(xì)胞瘤苗誘導(dǎo)抗腫瘤免疫應(yīng)答的體外研究
[Abstract]:Aim: when tumor cells present antigen to T cells, they can not initiate effective anti-tumor immune response due to the lack of costimulatory molecules on the surface. In order to introduce costimulatory molecules into tumor cells to prepare tumor vaccine, we transferred the eukaryotic expression vector pEGFP-C1-B7-H3 expressing B7-H3 gene into Tca8113. The expression of B7-H3 gene in oral squamous cell carcinoma cell line Tca8113 was detected, and the ability of anti-tumor immune response induced by human B7-H3 gene squamous cell carcinoma cell vaccine in vitro was further studied. Methods: the eukaryotic expression plasmid pEGFP-C1-B7-H3 was transformed into human squamous cell carcinoma cell line Tca8113 by Liposome mediated method. The expression of green fluorescent protein was observed under fluorescence microscope for 24 hours and 30 days after transfection, and after successful transfection, the expression of green fluorescent protein was observed under fluorescence microscope, and the expression of green fluorescent protein was observed under fluorescence microscope. The expression of gene B7-H3 in transfected cells was detected by RT-PCR. The expression of its protein was detected by Western blot, and the stable and high expression clone was obtained after G418 screening. The tumor cell vaccine was prepared by mitomycin C (MMC) treatment. After co-culture with human peripheral blood lymphocytes in vitro, the specific killing activity of lymphocytes and the effect on cytokines produced by lymphocytes were measured. Results: the pEGFP-C1-B7-H3 vector was transferred into oral squamous cell carcinoma cell line Tca8113 with Lipofectamine2000 cell transfer kit. At 24 h, 14 d and 30 d, the cells were observed by fluorescence under 10 脳 20 times inverted microscope (light wave wavelength 488nm or 513nm). At the same time, it was compared with oral squamous cell carcinoma cell line Tca8113, which was not infected with plasmid. The high expression of B7-H3 gene was still detected in Tca8113 cells transfected with B7-H3 after subculture. The total RNA, was extracted from Tca8113 cells transfected with pEGFP-C1-B7-H3 by Trizol, and the expression of B7-H3 was detected by RT-PCR. The results of PCR product electrophoresis showed that the size of the amplified product was about 215 BP, which was consistent with the expected size. No PCR products of 215bp were detected in Tca8113 cells transfected with empty vector pEGFP-C1. The B7-H3/Tca8113 gene transfected cells were extracted by Western blot and the specific bands of the relative molecular weight of the membrane proteins of Tca8113 cells (B7-H3/Tca8113) which had been transfected with pEGFP-C1-B7-H3 were lysed into the membrane proteins of Tca8113 cells (B7-H3/Tca8113), which were about the size of 84~90KD. However, mock/Tca8113 had no specific band. B7-H3/Tca8113 cell line was established by single clone method after G418 screening. B7-H3 protein was highly expressed in Tca8113 cells transfected with B7-H3. After MMC treatment, compared with wild type Tca8113 cells, the co-culture of T cells and T cells by the above tumor vaccine showed that the co-culture of T cells and T cells could promote the proliferation of T cells in vitro and induce lymphocytes to produce specific killing effect against Tca8113. It can significantly enhance the ability of lymphocytes to secrete IFN- 緯. Conclusion: the eukaryotic expression vector pEGFP-C1-B7-H3 was transferred into oral squamous cell carcinoma cell line Tca8113 by lipid method, and the cell line stably expressing B7-H3 protein was established by selected single clone method. The expression of B7-H3 gene in the cells was identified by RT-PCR and Western blot. TCV-hB7-H3, was obtained by MMC treatment of B7-H3/Tca8113. The culture test with T cells in vitro showed that co-culture of T cells and T cells could promote the proliferation of T cells in vitro, induce lymphocytes to produce specific killing effect against Tca8113, and significantly enhance the ability of lymphocytes to secrete IFN- 緯. Human squamous cell carcinoma cell vaccine with B7-H3 gene can induce effective anti-squamous cell carcinoma immune response. It lays a foundation for the study of the regulation of B7-H3 on immune cells and tumor gene therapy in vivo.
【學(xué)位授予單位】:安徽醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2008
【分類號(hào)】:R392;R730.5
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