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After two consecutive inoculations with Staphylococcus enterotoxin B (SEB) at 24 h intervals in vivo, CD4 T cells became anergic to the antigen challenge in vitro. Administration of anti-CTLA-4 mAb in conjunction with the second SEB inoculation 24 h after antigen priming interfered with anergy and CD4 T cells became T(h)2 cells. However, the anergy induction was not ablated when SEB and anti-CTLA-4 mAb were administered 48 or 72 h after antigen priming. Moreover, anti-CTLA-4 mAb without SEB did not interfere with anergy nor promoted the T(h)2 differentiation. T-antigen-presenting cell (APC) interaction in vitro in the presence of high doses of antigen and anti-CTLA-4 mAb induced a T(h)2-polarizing cytokine IL-6 and IL-10. IL-10 then down-modulated a T(h)1-polarizing cytokine IL-12. The results demonstrate that 24 h after the initial antigen stimulation, CD4 T cells enter the critical activation phase where antigen re-stimulation with or without CTLA-4 engagement alters the fate of the cell, anergy or differentiation respectively. Once anergy is interfered with, T(h)2-polarizing cytokines produced upon prolonged T-APC interaction favor the T(h)2 differentiation.

Control of CD4 T cell fate by antigen re-stimulation with or without CTLA-4 engagement 24 h after priming