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miR-709 inhibits 3T3-L1 cell differentiation by targeting GSK3β of Wnt/β-catenin signaling.

Cell. Signal.2014 Nov;26(11):2583-9. Epub 2014 Jul 16
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摘要


Adipocyte differentiation is tightly regulated by altering gene expression in which microRNAs might be strong post-transcriptional regulators. In this study, we examined the roles of miR-709 in adipogenic differentiation of 3T3-L1 preadipocyte. We found that miR-709 expression was down-regulated during adipogenesis after MDI (1-methyl-3-isobutylxanthine, dexamethasone and insulin) stimulation in normal cultured 3T3-L1 cells, while up-regulated after LiCl treatment. Overexpression of miR-709 inhibited adipogenic differentiation of 3T3-L1 cells. We demonstrated that miR-709 directly targeted of GSK3β (glycogen synthase kinase 3 beta). Overexpression of miR-709 decreased GSK3β protein but not mRNA level. Furthermore, the inhibition of miR-709 could be counteracted by overexpression of GSK3β during 3T3-L1 adipogenic differentiation. In addition, miR-709 increased both protein and mRNA levels of β-catenin, which is the downstream effector of GSK3β in Wnt/β-catenin signaling pathway, and subsequently elevated the expression of target of β-catenin which represses adipogenesis. These data indicate that miR-709 inhibits adipocyte differentiation through targeting GSK3β and subsequently activating Wnt/β-catenin signaling pathway.

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原始数据


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