Abstract
CD4(+)CD25(high)CD127(low/-) forkhead box p3 (Foxp3)(+) regulatory T cells (T(reg) cells) possess functional plasticity. Here we describe a higher frequency of T helper type 1 (T(H)1)-like, interferon-γ (IFN-γ)-secreting Foxp3(+) T cells in untreated subjects with relapsing remitting multiple sclerosis (RRMS) as compared to healthy control individuals. In subjects treated with IFN-β, the frequency of IFN-γ(+)Foxp3(+) T cells is similar to that in healthy control subjects. In vitro, human T(reg) cells from healthy subjects acquire a T(H)1-like phenotype when cultured in the presence of interleukin-12 (IL-12). T(H)1-like T(reg) cells show reduced suppressive activity in vitro, which can partially be reversed by IFN-γ-specific antibodies or by removal of IL-12.
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