精品文档---下载后可任意编辑B7-H1 在 HIV 感染患者 mDC 上的表达及其免疫调节作用讨论的开题报告Title：Expression of B7-H1 on mDCs in HIV-infected patients and its immune regulation roleIntroduction：Human immunodeficiency virus (HIV) infection is a chronic viral infection that severely impairs the immune function of infected individuals. The depletion of CD4+ T cells and dysfunction of dendritic cells (DCs) can lead to a weakened immune response against infections and increased susceptibility to opportunistic infections. B7 homolog 1 (B7-H1), also known as programmed death ligand-1 (PD-L1), is a transmembrane protein that is commonly expressed on various cells, including DCs. B7-H1 plays a key role in regulating T cell activation and immune response, and its upregulation has been observed during viral infections. However, the expression and role of B7-H1 on DCs in HIV-infected individuals remains unclear.Objective：This study aims to investigate the expression of B7-H1 on myeloid dendritic cells (mDCs) in patients with HIV infection and its potential immune regulatory function.Methods：Blood samples will be collected from HIV-infected individuals and healthy controls. The frequency and expression levels of B7-H1 on mDCs will be analyzed by flow cytometry. The cytokine profiles of DCs and T cells will be measured by ELISA, and the effect of B7-H1 on DC-T cell interactions will be assessed by in vitro coculture assays.Expected results：We expect to find an increased expression of B7-H1 on mDCs in HIV-infected individuals compared to healthy controls. We also anticipate that the upregulation of B7-H1 on mDCs may contribute to a regulatory immune response, leading to impaired T cell activation, cytokine secretion, and reduced immune response to HIV. Our findings may provide a better understanding of the immune regulation mechanisms during HIV infection and aid in the development of novel immunotherapies.
