Foxp3突變體相關融合蛋白的表達、純化、鑒定及生物學功能的初步研究
[Abstract]:Foxp3 is a member of FOX (forkhead box) family transcription factors and a specific marker of regulatory T cell (regulatory T cells,Treg. It also plays a key role in the genesis, development, function maintenance and development of Treg. It has been found that the expression of exogenous Foxp3 can make non-regulatory T cells have a regulatory T-cell-like phenotype and immunosuppressive function. The mutation of Foxp3 may lead to regulatory CD4~ CD25~ T cell-mediated immune tolerance defects. HIV-1 (human immunodeficiency virus type 1) the protein transduction domain (protein transductiondomain,PTD) of the transactivator protein (transactivator,TAT) encoded by the gene can carry foreign proteins into almost all eukaryotic membranes and into the cytoplasm and nucleus. At the same time, it has the characteristics of high efficiency and fast. Objective: to construct a prokaryotic expression vector pET28a-PTD- Foxp3,pET28a-PTD-eGFP- Foxp3,pET28a-PTD-eGFP-Foxp3, with HIV-1 transmembrane sequence and purify mouse PTD- Foxp3,PTD-eGFP- Foxp3,PTD-eGFP-Foxp3 fusion protein. To study the effect of fusion protein on T cell activation and proliferation. Methods: the prokaryotic expression vector of pET28a-PTD- Foxp3,pET28a-PTD-eGFP- Foxp3,pET28a-PTD-eGFP-Foxp3 was constructed by gene recombination technique, and the fusion protein was expressed in Escherichia coli Rosetta (DE3). The fusion protein was purified by Ni~ (2) column. The expression of fusion protein was detected by Western-blot, and the ability of fusion protein to cross cell membrane into mouse T lymphocyte tumor EL-4 cell line was detected by flow cytometry. The effect of fusion protein on T cell activation and proliferation was analyzed by mixed lymphocyte reaction. Results: pET28a-PTD- Foxp3,pET28a-PTD-eGFP- Foxp3,pET28a-PTD-eGFP-Foxp3 fusion protein expression vector was successfully constructed, and PTD- Foxp3,PTD-eGFP- Foxp3,PTD-eGFP-Foxp3 fusion protein was expressed and purified. Flow cytometry showed that the expressed fusion protein could be efficiently transferred into the cells. At the same time, the mixed lymphocyte reaction showed that PTD-eGFP-Foxp3 fusion protein could significantly inhibit the activation and proliferation of T lymphocytes, while the PTD- Foxp3,PTD-eGFP- Foxp3 fusion protein could inhibit the activation and proliferation of T cells. Conclusion: the successful expression of PTD- Foxp3,PTD-eGFP- Foxp3,PTD-eGFP-Foxp3 fusion protein with biological activity lays a foundation for the further study of the immunosuppressive function of Foxp3 and the construction of human PTD-Foxp3 related fusion protein.
【學位授予單位】:江蘇大學
【學位級別】:碩士
【學位授予年份】:2008
【分類號】:R341
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