MSCs exosomal miR-1470 promotes the differentiation of CD4+CD25+FOXP3+ Tregs in asthmatic patients by inducing the expression of P27KIP1

[Display omitted] •Mesenchymal Stem Cells (MSCs) derived exosomes elevate the level of miR-1470 of CD4+ T cells from asthmatic patients.•miR-1470 mediated the induction of CD4+CD25+FOXP3+ regulatory T cells (Tregs) induced by MSCs exosomes.•miR-1470 promotes the differentiation of CD4+CD25+FOXP3+ Tregs via P27KIP1. Exosomes derived from Mesenchymal Stem Cells (MSCs) possesses similar immunomodulatory effect as MSCs. It had been suggested that MSCs exosomes contain higher level of miR-1470 compared to exosomes derived from fibroblast. Here, we show that MSCs exosomal miR-1470 can elevate the proportion of CD4+CD25+FOXP3+ regulatory T cells (Tregs) in asthmatic patients. Moreover, mechanistic studies revealed that miR-1470 can promote the upregulation of P27KIP1 by directly targeting the 3′ region of c-Jun mRNA. Furthermore, miR-1470 mimic transfection could significantly upregulate the proportion of CD4+CD25+FOXP3+ Tregs in CD4+ T cells. P27KIP1 knockdown via siRNA silencing significantly inhibited the proportion of CD4+CD25+FOXP3+ Tregs with over-expression of miR-1470, which indicates that miR-1470 induces the differentiation of CD4+CD25+FOXP3+ Tregs through P27KIP1.