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miR-139-5p Represses BMSC Osteogenesis via Targeting Wnt/β-Catenin Signaling Pathway.
DNA and Cell Biology 2017 August
Osteogenesis of mesenchymal stem cells (MSCs) has played a necessary role in the repair of bone. According to some reports, microRNAs participate in different physiological activity of the cells, including cell differentiation. This study investigated the function that miR-139-5p plays in the osteogenic differentiation of human bone marrow MSCs (hBMSCs). In addition to miR-139-5p, the effects of alkaline phosphatase (ALP), a membrane-bound metalloenzyme that is considered an early osteogenic differentiation marker, have also been investigated. Calcium-rich deposit (mineralization) is also a typical osteogenic differentiation marker that could be visualized by alizarin red S (ARS) staining. Inhibiting miR-139-5p notably promotes the hBMSC osteoblast differentiation, which, however, will be reduced by overexpressed miR-139-5p. This result has been made based on the alternations of ALP activity, ARS staining, as well as expression of osteogenic genes, including runt-related gene-2 (Runx2), collagen I (Col-1), and osteocalcin (OCN). miR-139-5p exerts its role in BMSC osteogenesis most probably through the Wnt/β-catenin pathway, by direct targeting CTNNB1 and frizzled 4 (FZD4), essential factors of Wnt/β-catenin pathway. In conclusion, according to the present study, inhibiting miR-139-5p could be a promising strategy in hBMSC osteogenesis.
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