Circulating exosomes suppress the induction of regulatory T cells via let-7i in multiple sclerosis.

Circulating exosomes suppress the induction of regulatory T cells via let-7i in multiple sclerosis.
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DOI:
10.1038/s41467-017-02406-2
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发表时间:
2018-01-02
影响因子:
16.6
通讯作者:
Yamamura T
Yamamura T
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kimura K;Hohjoh H;Fukuoka M;Sato W;Oki S;Tomi C;Yamaguchi H;Kondo T;Takahashi R;Yamamura T

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Multiple sclerosis (MS) is a T cell-mediated autoimmune disease of the central nervous system. Foxp3+ regulatory T (Treg) cells are reduced in frequency and dysfunctional in patients with MS, but the underlying mechanisms of this deficiency are unclear. Here, we show that induction of human IFN-γ−IL-17A−Foxp3+CD4+ T cells is inhibited in the presence of circulating exosomes from patients with MS. The exosomal miRNA profile of patients with MS differs from that of healthy controls, and let-7i, which is markedly increased in patients with MS, suppresses induction of Treg cells by targeting insulin like growth factor 1 receptor (IGF1R) and transforming growth factor beta receptor 1 (TGFBR1). Consistently, the expression of IGF1R and TGFBR1 on circulating naive CD4+ T cells is reduced in patients with MS. Thus, our study shows that exosomal let-7i regulates MS pathogenesis by blocking the IGF1R/TGFBR1 pathway. MiRNAs are small RNA molecules that can regulate gene expression. Here the authors show that expression of several exosomal miRNAs are altered in patients with multiple sclerosis, and that let-7i modulates regulatory T cell homeostasis to contribute to pathogenesis.
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