Abstract:
AIM:High mobility group box 1 protein (HMGB1) has been identified as a late proinflammatory cytokine and plays a key role in immune regulation. However, it is not yet clear whether HMGB1 can induce the activation and differentiation of dendritic cell (DC) subsets and subsequently modulate immune function of T cells. This study was performed to investigate the effect of HMGB1 on the differentiation of splenic DCs and its influence on T cell-mediated immunity in terms of DC subsets CD11c(low)CD45RB(high) DCs and CD11c(high)CD45RB(low) DCs in male BALB/c mice spleens in vitro. RESULTS:MACS microbeads were used to isolate splenic DCs, CD11c(low)CD45RB(high) DCs, CD11c(high)CD45RB(low) DCs and CD4(+) T cells. The percentage of CD11c(low)CD45RB(high) DCs was significantly increased after treatment with HMGB1 compared to their counterparts (CD11c(high)CD45RB(low) DCs). It was found that unlike the gradually increasing interleukin (IL)-12 secretion of CD11c(high)CD45RB(low) DCs induced by HMGB1, CD11c(low)CD45RB(high) DCs showed a obvious dose-dependent response between IL-10 production and HMGB1 stimulation. In order to verify whether the alteration of CD4(+) T cells was mainly associated with the differentiation of splenic DCs mediated by HMGB1 to CD11c(low)CD45RB(high) DCs, anti-IL-12 receptor (IL-12R) or anti-IL-10R monoclonal antibody was used to inhibit the effect of CD11c(high)CD45RB(low) DCs or CD11c(low)CD45RB(high) DCs in CD4(+) T cells mixed lymphocyte reaction culture. After treatment with anti-IL-12R or anti-IL-10 monoclonal antibody in CD4(+) T cells+CD11c(high)CD45RB(low) DCs or CD11c(low)CD45RB(high) DCs mixed lymphocyte reaction, the induction of these DCs on T cells was inhibited dramatically. CONCLUSION:These data demonstrated that HMGB1 might induce the differentiation of splenic DCs to CD11c(low)CD45RB(high) DCs followed by shifting of Th1 to Th2 with enhancement of T lymphocyte immune function in vitro. Also, the effect of HMGB1 on T cell differentiation to Th2 was not associated with the inhibition of IL-12 production in CD11c(high)CD45RB(low) DCs.
journal_name
Cytokinejournal_title
Cytokineauthors
Liu QY,Yao YM,Yan YH,Dong N,Sheng ZYdoi
10.1016/j.cyto.2011.01.008subject
Has Abstractpub_date
2011-05-01 00:00:00pages
205-11issue
2eissn
1043-4666issn
1096-0023pii
S1043-4666(11)00009-3journal_volume
54pub_type
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