MiRNA-20a promotes osteogenic differentiation of human mesenchymal stem cells by co-regulating BMP signaling
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AbstractOsteogenic differentiation of mesenchymal stem cells (MSCs) is a complex process, which is regulated by various factors including microRNAs. Our preliminary data showed that the expression of endogenous miR-20a was increased during the course of osteogenic differentiation. Simultaneously, the expression of osteoblast markers and regulators BMP2, BMP4, Runx2, Osx, OCN and OPN was also elevated whereas adipocyte markers PPAR gamma and osteoblast antagonist, Bambi and Crim1, were downregulated, thereby suggesting that miR-20a plays an important role in regulating osteoblast differentiation. To validate this hypothesis, we tested its effects on osteogenic differentiation by introducing miR-20a mimics and lentiviral-miR20a-expression vectors into hMSCs. We showed that miR-20a promoted osteogenic differentiation by the upregulation of BMP/Runx2 signaling. We performed bioinformatics analysis and predicted that PPAR gamma, Bambi and Crim1 would be potential targets of miR-20a. PPAR gamma is a negative regulator of BMP/Runx2 signaling whereas Bambi or Crim1 are antagonists of the BMP pathway. Furthermore, we confirmed that all these molecules were indeed the targets of miR-20a by luciferase reporter, quantitative RT-PCR and western blot assays. Similarly to miR-20a overexpression, the osteogenesis was enhanced by the silence of PPAR gamma, Bambi or Crim1 by specific siRNAs. Taken together, for the first time, we demonstrated that miR-20a promoted the osteogenesis of hMSCs in a co-regulatory pattern by targeting PPAR gamma, Bambi and Crim1, the negative regulators of BMP signaling.
All Author(s) ListZhang JF, Fu WM, He ML, Xie WD, Lv Q, Wan G, Li G, Wang H, Lu G, Hu X, Jiang S, Li JN, Lin MCM, Zhang YO, Kung HF
Journal nameRNA Biology
Detailed descriptionTo ORKTS: duplicated record
Year2011
Month9
Day1
Volume Number8
Issue Number5
PublisherTaylor & Francis: STM, Behavioural Science and Public Health Titles
Pages829 - 838
ISSN1547-6286
eISSN1555-8584
LanguagesEnglish-United Kingdom
KeywordsBMP signaling pathway; co-regulatory pattern; mesenchymal stem cell; miR-20a; osteogenic differentiation
Web of Science Subject CategoriesBiochemistry & Molecular Biology; BIOCHEMISTRY & MOLECULAR BIOLOGY

Last updated on 2020-24-11 at 00:18