P38 MAP kinase signaling is required for the conversion of CD4+CD25- T cells into iTreg.

P38 MAP kinase signaling is required for the conversion of CD4+CD25- T cells into iTreg.
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DOI:
10.1371/journal.pone.0003302
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发表时间:
2008-10-01
期刊:
影响因子:
3.7
通讯作者:
Schramm C
Schramm C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Huber S;Schrader J;Fritz G;Presser K;Schmitt S;Waisman A;Lüth S;Blessing M;Herkel J;Schramm C

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CD4+CD25+调节性T细胞(Treg)是免疫耐受的重要介质。通过转化生长因子-β将传统的CD_4+CD_(25)−T细胞转化为诱导性T细胞(ITreg),可在外周产生Treg的一个亚群。在慢性病毒感染或恶性肿瘤中,这种诱导的iTreg限制了变异或感染细胞的耗尽,可能与致病相关。为了确定治疗干预的潜在靶点,我们研究了Treg中的转化生长因子-β信号转导。与传统的CD4+T细胞不同,Treg表现出显著的p38MAPK通路的激活。抑制p38MAPK活性可抑制转化生长因子β依赖的−T细胞向Foxp3+iTreg的转化。值得注意的是,抑制p38 MAPK并不影响nTreg的抑制能力。我们的发现表明,通过p38 MAP激酶的信号似乎对iTreg的外周生成很重要;因此,P38 MAP激酶可能成为增强对慢性病毒感染或癌症免疫的治疗靶点。
CD4+CD25+ regulatory T cells (Treg) are important mediators of immune tolerance. A subset of Treg can be generated in the periphery by TGF-beta dependent conversion of conventional CD4+CD25− T cells into induced Treg (iTreg). In chronic viral infection or malignancy, such induced iTreg, which limit the depletion of aberrant or infected cells, may be of pathogenic relevance. To identify potential targets for therapeutic intervention, we investigated the TGF-beta signaling in Treg. In contrast to conventional CD4+ T cells, Treg exhibited marked activation of the p38 MAP kinase pathway. Inhibition of p38 MAP kinase activity prevented the TGF-beta-dependent conversion of CD4+CD25− T cells into Foxp3+ iTreg in vitro. Of note, the suppressive capacity of nTreg was not affected by inhibiting p38 MAP kinase. Our findings indicate that signaling via p38 MAP kinase seems to be important for the peripheral generation of iTreg; p38 MAP kinase could thus be a therapeutic target to enhance immunity to chronic viral infection or cancer.
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