Abstract
Osteoporosis is a disease marked by reduced bone mass, leading to an increased risk of fractures or broken bones. Bone formation is mediated by recruiting mesenchymal stem cells (MSCs). Elucidation of the molecular mechanisms that regulate MSC differentiation into osteoblasts is of great importance for the development of anabolic therapies for osteoporosis and other bone metabolism-related diseases. microRNAs (miRNAs) have been reported to have crucial roles in bone development, osteogenic differentiation and osteoporosis pathophysiology. However, to date, only a few miRNAs have been reported to enhance osteogenesis and regulate the suppressive effect of glucocorticoids on osteogenic differentiation. In this study, we discovered that miR-216a, a pancreatic-specific miRNA, was significantly upregulated during osteogenic differentiation in human adipose-derived MSCs (hAMSCs). The expression of miR-216a was positively correlated with the expression of bone formation marker genes in clinical osteoporosis samples. Functional analysis demonstrated that miR-216a can markedly promote osteogenic differentiation of hAMSCs, rescue the suppressive effect of dexamethasone (DEX) on osteogenic differentiation in vitro and enhance bone formation in vivo. c-Cbl, a gene that encodes a RING finger E3 ubiquitin ligase, was identified as a direct target of miR-216a. Downregulation of c-Cbl by short hairpin RNAs can mimic the promotion effects of miR-216a and significantly rescue the suppressive effects of DEX on osteogenesis. Pathway analysis indicated that miR-216a regulation of osteogenic differentiation occurs via the c-Cbl-mediated phosphatidylinositol 3 kinase (PI3K)/AKT pathway. The recovery effects of miR-216a on the inhibition of osteogenesis by DEX were attenuated after blocking the PI3K pathway. Thus, our findings suggest that miR-216a may serve as a novel therapeutic agent for the prevention and treatment of osteoporosis and other bone metabolism-related diseases.
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Abbreviations
- MSCs:
-
mesenchymal stem cells
- miRNAs:
-
microRNAs
- hAMSCs:
-
human adipose-derived MSCs
- hucMSCs:
-
human umbilical cord-derived MSCs
- DEX:
-
dexamethasone
- GIO:
-
glucocorticoid-induced osteoporosis
- 3′UTR:
-
3′-untranslated region
- ALP:
-
alkaline phosphatase
- RUNX2:
-
runt-related transcription factor
- OSX:
-
osterix
- OPN:
-
osteopontin
- qRT-PCR:
-
quantitative real-time PCR
- HA/TCP:
-
hydroxyapatite/tricalcium phosphate
- shRNA:
-
short hairpin RNA
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Acknowledgements
This work was supported by grants from the National Natural Science Foundation of China (no. 81370466 and no. 81272009), the National Key Scientific Program of China (no. 2011CB964901), National Collaborative Innovation Program, and Program for Cheung Kong Scholars and Innovative Research Team in University-PCSIRT (no. IRT0909), and the National Science and Technology Major Projects for ‘Drug Research and Development′ (2014ZX09101042).
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Li, H., Li, T., Fan, J. et al. miR-216a rescues dexamethasone suppression of osteogenesis, promotes osteoblast differentiation and enhances bone formation, by regulating c-Cbl-mediated PI3K/AKT pathway. Cell Death Differ 22, 1935–1945 (2015). https://doi.org/10.1038/cdd.2015.99
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DOI: https://doi.org/10.1038/cdd.2015.99
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