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Regulatory T cells play an essential role in preventing fetal rejection by the maternal immune system. Here we show that, based on the expression of CCR5, regulatory T cells can be divided into a highly suppressive CCR5+ and a far less suppressive CCR5- subpopulation, suggesting that the former represent the effector arm of regulatory T cells. Although regulatory T cells from CCR5-/- gene deletion mutants still suppress, they are less effective mediators of maternal-fetal tolerance. The accumulation of CCR5+ regulatory T cells at this site appears to be enhanced by alloantigen. This finding is in stark contrast to the systemic expansion of regulatory T cells during pregnancy, which appears to be alloantigen-independent. The fact that CCR5+ regulatory T cells preferentially accumulate in the gravid uterus and that expression of CCR5 on regulatory T cells can be induced by activation lead us to propose that CCR5 is responsible for the accumulation of those regulatory T cells that have been activated by paternal antigens.

Alloantigen-enhanced accumulation of CCR5+‘effector’ regulatory T cells in the gravid uterus

Alloantigen-enhanced accumulation of CCR5⁺‘effector’ regulatory T cells in the gravid uterus