The initial phase of an immune response functions to activate regulatory T cells.
The initial phase of an immune response functions to activate regulatory T cells.
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DOI:
10.4049/jimmunol.0900691
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发表时间:
2009-07-01
期刊:
影响因子:
--
通讯作者:
Abbas AK
中科院分区:
文献类型:
--
作者:
O'Gorman WE;Dooms H;Thorne SH;Kuswanto WF;Simonds EF;Krutzik PO;Nolan GP;Abbas AK
An early reaction of CD4+ T lymphocytes to antigen is the production of cytokines, notably IL-2. In order to detect cytokine dependent responses, naive antigen-specific T cells were stimulated in vivo and the presence of phosphorylated STAT5 molecules was used to identify the cell populations responding to IL-2. Within hours of T-cell priming, IL-2-dependent STAT5 phosphorylation occurred primarily in Foxp3+ regulatory T cells. In contrast, the antigen-specific T cells received STAT5 signals only after repeated antigen exposure or memory differentiation. Regulatory T cells receiving IL-2 signals proliferated and developed enhanced suppressive activity. These results indicate that one of the earliest events in a T cell response is the activation of endogenous regulatory cells, potentially to prevent autoimmunity.
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DOI:
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