Journal
JOURNAL OF BONE AND MINERAL METABOLISM
Volume 36, Issue 6, Pages 648-660Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s00774-017-0886-8
Keywords
MiR-23b; Runx2; TNF-; BMSCs; Osteogenic differentiation
Funding
- Key Discipline Construction Fund of Shanghai Education Commission [J50206]
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Elucidation of the molecular mechanism governing bone marrow mesenchymal stem cell (BMSC) osteogenic differentiation is of great importance for improving the treatment of osteoporosis. TNF- is a well-known inhibitory factor during osteogenic differentiation of BMSCs. In our experiment, we consistently observed that TNF- significantly inhibited BMSC osteogenic differentiation, which was partially rescued by BAY 11-7082 (NF-B inhibitor). In this study, we examined the potential roles of microRNAs (miRNAs) involved in TNF--mediated reduction of BMSC osteogenesis. We found that microRNA-23b (miR-23b) was dramatically induced under the stimulation of TNF-, which was abolished by BAY 11-7082. Similar to the effect of TNF-, miR-23b agonist (agomir-23b) obviously impaired BMSC osteogenic differentiation in vitro and in vivo. However, agomir-23b had no effect on osteoclast activity. Overexpression of miR-23b significantly reduced runx2, the master transcription factor during osteogenesis, suggesting that miR-23b acts as an endogenous attenuator of runx2 in BMSCs. Mutation of the putative miR-23b binding site in runx2 mRNA blocked miR-23b-mediated repression of the runx2 3 untranslated region (3UTR) luciferase reporter activity, suggesting that miR-23b directly binds to runx2 3UTR. Furthermore, infection with Ad-runx2 (adenovirus carrying the entire CDS sequence of runx2) effectively rescued the inhibition of BMSC osteogenic differentiation in miR-23b-overexpressing cells, indicating that the inhibiting effect of miR-23b on osteogenesis is mediated by suppression of runx2. Moreover, caudal vein injection of agomir-23b notably caused severe osteoporosis in mice, and forced expression of runx2 by combined injecting Ad-runx2 attenuated the bone loss induced by miR-23b. Collectively, these data indicated that miR-23b was involved in TNF--mediated reduction of BMSC osteogenesis by targeting runx2. These findings may provide new insights into understanding the regulatory role of miR-23b in the process of BMSC osteogenic differentiation in inflammatory conditions and a novel therapeutic target for osteoporosis.
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