Regulatory T cells selectively control CD8+ T cell effector pool size via IL-2 restriction.

Regulatory T cells selectively control CD8+ T cell effector pool size via IL-2 restriction.
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DOI:
10.4049/jimmunol.1101649
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发表时间:
2011-09-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Germain RN
Germain RN
中科院分区:
其他
文献类型:
--
作者:
Kastenmuller W;Gasteiger G;Subramanian N;Sparwasser T;Busch DH;Belkaid Y;Drexler I;Germain RN

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Treg are key players in maintaining immunhomeostasis but have also been shown to regulate immune responses against infectious pathogens. Therefore Treg are a promising target for modulating immune responses to vaccines in order to improve their efficacy. Using a viral vector system, we found that Treg act on the developing immune response early after infection by reducing the extent of dendritic cell costimulatory molecule expression. Due to this change and the lower IL-2 production that results, a substantial fraction of CD8+ effector T cells lose CD25 expression several days after activation. Surprisingly, such Treg-dependent limitations in IL-2 signaling by antigen-activated CD8+ T cells prevent effector differentiation without interfering with memory cell formation. In this way Treg fine-tune the numbers of effector T cells generated, while preserving the capacity for a rapid recall response upon pathogen re-exposure. This selective effect of Treg on a subpopulation of CD8+ T cells indicates that while manipulation of the Treg compartment might not be optimal for prophylactic vaccinations, it can be potentially exploited to optimize vaccine efficacy for therapeutic interventions.
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