4-1BBL expressed by eukaryotic cells activates immune cells and suppresses the progression of murine tumor
4-1BBL expressed by eukaryotic cells activates immune cells and suppresses the progression of murine tumor
Hui QIU1, Hui ZHANG2, Zuohua FENG2()
1. Department of Oncology, Zhongnan Hospital, Wuhan University, Wuhan 430071, China; 2. Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
The interaction by co-stimulatory molecules 4-1BB and 4-1BB ligand (4-1BBL) plays an important role in the activation, proliferation and differentiation of T lymphocytes. The function of 4-1BB/4-1BBL expressed by the immune cells has been the focus for many tumor immunotherapy efforts. In this study, 4-1BBL was expressed in non-immune cells and non-tumor cells, and the role of 4-1BBL in lymphocyte activation and tumor suppression was investigated. The plasmid p4-1BBL containing the full length of mouse 4-1BBL cDNA sequence was constructed, and the plasmid was transfected into baby hamster kidney (BHK) cells and murine muscle cells by means of lipofectin-mediated or naked plasmid DNA injection into the muscle directly. The study demonstrated that the molecule 4-1BBL expressed by BHK cells in vitro could enhance the proliferation and cytotoxicity of lymphocytes, and it could increase the expression level of IL-2 and IFN-γ. The treatment with plasmid p4-1BBL in vivo revealed that the number of CD8+ T cells in the peri-tumoral tissue increased markedly, and the growth rate of the tumor was significantly lower than that of control group. These findings suggest that expression of 4-1BBL by normal cells in the tumor microenvironment can enhance the proliferation and other functions of T lymphocytes. This therapeutic method may provide a promising approach for tumor immunotherapy.
. 4-1BBL expressed by eukaryotic cells activates immune cells and suppresses the progression of murine tumor[J]. Frontiers of Medicine in China, 2009, 3(1): 20-25.
Hui QIU, Hui ZHANG, Zuohua FENG. 4-1BBL expressed by eukaryotic cells activates immune cells and suppresses the progression of murine tumor. Front Med Chin, 2009, 3(1): 20-25.
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