Positive Regulatory Function of miR-92a During Osteoblast Differentiation
首发时间:2016-03-08
Abstract:MicroRNAs regulate biological processes by binding to mRNA 3'-untranslated region (UTR) sequences to attenuate protein synthesis. Here we identified that miR-92a are up-regulated through stages of osteoblast differentiation. Twist-1, a negative regulator of osteoblast differentiation, is validated to be a direct target of miR-92a by luciferase activity assay. Overexpression of miR-92a down-regulates Twist-1 protein expression, but not its mRNA level. Inversely, ectopic miR-92a expresson increases Runx2 expression, as well as alkaline phosphatase and osteocalcin mRNA level. Twist-1 protein shows reverse profile as miR-92a and Runx2 during osteoblast differentiation. Thus, we propose that miR-92a functions as a positive regulator during osteoblast differentiation by targeting anti-osteogenic factors and activating osteogenic marker genes.
keywords: miR-92a Twist-1 Runx2 Osteoblast differentiation
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miR-92a在成骨细胞分化中发挥正性调控功能
摘要:microRNA通过介导蛋白翻译的阻抑调节多种生物学过程。我们发现miR-92a在成骨细胞的分化过程中表达上调,并鉴定成骨分化的负调控因子Twist-1为miR-92a直接的靶基因。而且miR-92a过表达增加Runx2,碱性磷酸酶和骨钙蛋白的mRNA表达水平。在成骨分化过程中,Twist-1蛋白与miR-92a和Runx2蛋白呈相反的趋势。因此我们的研究推论,miR-92a通过靶向作用于抗成骨因子以及激活成骨标记基因的表达,在成骨细胞分化过程中发挥正调控作用。
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