Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 104, Issue 2, Pages 594-599Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0604268104
Keywords
effector T cells; pregnancy; tolerance; chemokine receptor
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Funding
- Medical Research Council [MC_U105184296] Funding Source: Medline
- Medical Research Council [MC_U105184296] Funding Source: researchfish
- MRC [MC_U105184296] Funding Source: UKRI
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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.
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