Inhibitory effects of CD4+CD25+regulatory T cells on effector T cells in murine cytomegalovirus infection
- VernacularTitle:CD4+CD25+调节性T细胞抑制效应性T细胞在MCMV感染中的免疫作用
- Author:
Yanan LI
;
Feng FANG
;
Hong ZHEN
;
Sainan SHU
;
Yufeng ZHOU
;
Yongsui DONG
- Publication Type:Journal Article
- Keywords:
Cytomegalovirus;
Regulatory T cells(Treg);
Effector cells;
T-bet;
GATA-3
- From:
Chinese Journal of Microbiology and Immunology
2008;28(3):234-238
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the role of CD4+CD25+regulatory T cells(Treg)in the co-culture svstem consisting of T cells and mouse embryo fibroblasts(MEF)infected with murine cytomegalovirus (MCMV)in vitro.Methods A co-culture system of T cells and MCMV infected MEF(MEFMCMV)was established.The viral load in the supernatants was determined by plaque assay.TH1/TH2 differentiation-specific transcription factors T-bet/GATA-3 were assayed by Western blot.The levels of cytokines IL-4,IL-10and IFN-γ in the co-culture supenatants were measured by double-antibody sandwich ELISA.Results After 3 d incubation,the viral load in the supernatants of TdepTreg-MEFMCMC group,in which the T cells depleted Treg(TdepTreg)were co-cultured together with MEFMVMV,was significantly lower than that in MEFMCMV group.And in the co-cultivation of MEFMCMV and T cells without Treg the expressions of T-bet/GATA-3,IL-4,IL-10 and IFN-γ incteased significantly.Compared with the virus content in the TdepTreg-MEFMCMV group,the MCMV load in the"add-on Treg group"increased and the levels of T-bet/GATA-3 and IFN-γ were lower,and the expression of IL-4 didn't show any significant difference. Compared with the level of IL-10 in the TdepTreg-MEFMCMV group,the IL-10 level in the"add-on TREG group"didn't show any significant differece when the Treg ratio among total T cells was 1%～2%,and increased significantly when the Treg ratio was more than 5%.These eflfects were all correlated with Treg ratios in a dose-dependent manner.Conclusion MCMV infected MEF can induce the proliferation and activation of effector T cells,but Treg can inhibit the T cell-mediated protective effect on MCMV infection.
