抗白細胞介素-33主動免疫在小鼠乳腺癌腫瘤模型中的干預研究
[Abstract]:Background Interleukin-33 (IL-33) is a multipotent cytokine, which is closely related to the occurrence and development of many kinds of tumors. It is highly expressed in breast cancer, lung cancer, gastric cancer, ovarian cancer and other tumor diseases. As a key stimulator of type 2 immune response, IL-33 significantly stimulated the differentiation and proliferation of Th2 and type 2 macrophages, and promoted the infiltration of MDSCs and Treg into tumor tissues. It may play an important role in tumor immune suppression and immune escape in tumor microenvironment. Therefore, IL-33 is a potential target of tumor immunotherapy. The immunological intervention of IL-33 may provide new ideas for the prevention and treatment of tumor. Objective to study the effect of anti-cytokine active immunization on tumor growth and anti-tumor immune response in mice by down-regulating the level of IL-33 in vivo. To reveal the role of IL-33 in the formation and development of breast cancer and the potential application of targeted active immune intervention strategies in clinical treatment of breast cancer and other tumors. Methods the recombinant protein was expressed in Escherichia coli and purified by ammonium sulfate salting out method and density gradient centrifugation with iodoxacin. The VLPs vaccine was immunized by prophylactic or therapeutic immunization strategy in mice bearing tumor. ELISA was used to detect the level of IL-33 specific IgG antibody in the serum of immunized mice; the size of subcutaneous tumor was measured every 2 days; the number of pulmonary tumor nodules was recorded to investigate lung metastasis. The expression of IFN- 緯 in spleen cells was detected by ELISA, IFN-Y secreted by ELISPOT and CD8 IFN- 緯 CTL cells by flow cytometry. In addition, lymphocytes infiltrated by tumor tissue were separated and used for flow cytometry analysis of Treg,MDSCs. Results the recombinant HBcAg and IL-33 chimeric protein HBcAg-33 were highly expressed in Escherichia coli DH5 偽, and the purified protein mainly existed in the form of VLPs. After immunizing mice with prophylactic strategy, the growth of breast tumor was significantly inhibited. In the therapeutic intervention strategy, HBcAg-33 VLPs immunity significantly inhibited tumor growth in the early stage of tumor growth, but the inhibitory effect was weakened with the tumor growing larger, but lung metastasis was significantly inhibited in immunized mice. High titer IL-33 specific antibody response could be detected in the serum of immunized mice. Further analysis of immune response showed that HBcAg-33 VLPs vaccine stimulated spleen cells to produce significantly enhanced INF- 緯 expression and increased number of spleen cells expressing INF- 緯. Flow cytometry showed that the number of CD8 INF- 緯 CTL cells and CD4 INF- 緯 Th1 in spleen cells increased significantly, while the level of CD4 IL-4 Th2 cells decreased to a certain extent. In addition, the number of MDSCs,Treg cells in tumor tissues was significantly down-regulated in vaccinated mice. According to the bias of Th1/CTL immune response reflected by cytokine expression and flow cytometry, the proportion of IgG1/IgG2a in serum decreased significantly. Conclusion the HBcAgVLPs vaccine presented with the whole IL-33 molecule can stimulate a sustained specific antibody response and inhibit tumor growth and metastasis significantly in breast cancer model. The possible mechanism is to regulate the T cell response to the Th1/CTLs type bias. The results are helpful to reveal the possible role of IL-33 in the formation, growth and metastasis of breast cancer, and the potential application prospect of active immunization strategy against IL-33 vaccine in the clinical treatment of breast cancer.
【學位授予單位】:北京協(xié)和醫(yī)學院
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R737.9;R-332
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