Foxp3-dependent microRNA155 confers competitive fitness to regulatory T cells by targeting SOCS1 protein.

Foxp3-dependent microRNA155 confers competitive fitness to regulatory T cells by targeting SOCS1 protein.
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DOI:
10.1016/j.immuni.2008.11.010
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发表时间:
2009-01-16
期刊:
影响因子:
32.4
通讯作者:
Rudensky, Alexander Y.
Rudensky, Alexander Y.
中科院分区:
医学1区
文献类型:
--
作者:
Lu, Li-Fan;Thai, To-Ha;Calado, Dinis Pedro;Chaudhry, Ashutosh;Kubo, Masato;Tanaka, Kentaro;Loeb, Gabriel B.;Lee, Hana;Yoshimura, Akihiko;Rajewsky, Klaus;Rudensky, Alexander Y.

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Foxp3 +调节性T(TR)细胞限制针对自身和外来抗原的致病性免疫反应。通过对TR细胞特异性进行Dicer基因敲除实验揭示了微小RNA(miRNA)在TR细胞的维持和功能中发挥着重要作用,这引发了关于特定miRNA所起作用的问题。我们发现,在非淋巴细胞减少的条件下,Foxp3控制着维持TR细胞增殖活性和数量所需的miR155高表达。此外,TR细胞中miR155的缺失导致SOCS1表达增加,同时在白细胞介素 - 2量有限的情况下,STAT5活化受损。我们的研究表明,依赖于Foxp3对miR155的调控通过靶向SOCS1维持了TR细胞亚群的竞争适应性,并为miRNA在确保细胞表型稳定性方面所提出的作用提供了实验支持。
Foxp3+ regulatory T (TR) cells limit pathogenic immune responses to self and foreign antigens. An essential role for microRNA (miRNA) in the maintenance and function of TR cells, revealed by the TR-specific Dicer ablation, raised a question as to a specific miRNA contribution. We found that Foxp3 controls the elevated miR155 expression required for maintaining TR proliferative activity and numbers under non-lymphopenic conditions. Moreover, miR155 deficiency in TR cells results in increased SOCS1 expression accompanied by impaired STAT5 activation in response to limiting amounts of IL-2. Our studies suggest Foxp3-dependent regulation of miR155 maintains competitive fitness of TR subset by targeting SOCS1, and provide an experimental support for a proposed role for miRNAs in ensuring the robustness of cellular phenotypes.
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