Abstract
Elucidation of the molecular mechanisms that regulate the differentiation of adipose-derived mesenchymal stem cells into osteogenic cells may lead to new methods for bone tissue engineering. We examined the role of miR-26a-5p in the regulation of osteogenic differentiation of mouse adipose-derived mesenchymal stem cells (mADSCs) by using mimics and inhibitors of this microRNA. Our results showed that over-expression of miR-26a-5p inhibited osteogenesis and that suppression of endogenous miR-26a-5p promoted osteogenesis. Four bioinformatics algorithms indicated that the 3′UTR of Wnt5a was a potential target of miR-26a-5p. We confirmed this prediction by use of dual-luciferase reporter assay and GFP/RFP assay. We also examined the molecular mechanisms by which miR-26a-5p regulates osteogenesis. Fura-2AM and Western blot assays after transfection indicated that miR-26a-5p repressed WNT5A, inhibited calcium flux and protein kinase C, and suppressed osteogenic differentiation of mADSCs. By contrast, miR-26a-5p inhibition activated these signal proteins and promoted osteogenic differentiation. Taken together, our results suggest that up-regulation of miR-26a-5p inhibits osteogenic differentiation of mADSCs by directly targeting the 3′UTR of Wnt5a, thereby down-regulating the Wnt/Ca2+ signaling pathway.
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Abbreviations
- ADSCs:
-
Adipose-derived mesenchymal stem cells
- mADSCs:
-
Mouse adipose-derived mesenchymal stem cells
- hADSCs:
-
Human adipose-derived mesenchymal stem cells
- MSCs:
-
Mesenchymal stem cells
- miRNAs:
-
MicroRNAs
- miR-26a:
-
MicroRNA-26a
- miR-NC:
-
MicroRNA-26a-5p negative control
- UTR:
-
Untranslated regions
- CDK6:
-
Cyclin-dependent kinase 6
- HDAC4:
-
Histone deacetylase 4
- USSCs:
-
Unrestricted somatic stem cells
- BMP:
-
Bone morphogenetic protein
- GSK-3β:
-
Glycogen synthase kinase -3β
- PCP:
-
Planar cell polarity
- ROCK:
-
Rho-associated kinase
- PBS:
-
Phosphate buffer saline
- FBS:
-
Fetal calf serum
- qRT-PCR:
-
Quantitative real-time polymerase chain reaction
- GFP:
-
Green fluorescent protein
- RFP:
-
Red fluorescent protein
- MOI:
-
Multiplicity of infection
- WT:
-
Wild type
- Mu:
-
Mutation
- PKC:
-
Protein kinase C
- ALP:
-
Alkaline phosphatase
- OCN:
-
Osteocalcin
- OPN:
-
Osteopontin
- COL1:
-
Collagen type 1
- Runx2:
-
Runt homology domain transcription factor 2
- Osx:
-
Osterix
- CaMKII:
-
Calmodulin-dependent protein kinase II
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- ARS:
-
Alizarin red staining
- D-HBSS:
-
D-Hanks balanced salt solution
- Dsh:
-
Dishevelled
- RhoA:
-
Ras homolog gene family, member A
- JNK:
-
c-Jun N-terminal kinase
- Fz3:
-
Frizzled receptor 3
- Ror2:
-
Receptor tyrosine kinase-like orphan receptor 2
- P-PDLSCs:
-
Periodontal ligament stem cells from chronic periodontitis patients
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 10502037, 31070833, and 31570950), the Science and Technology Foundation of Sichuan Province (Nos. 2010GZ0225, 2011GZ0335, and 2009SZ0139), and the Cooperation Science Foundation between Sichuan University and Luzhou city (No. 2013CDLZ-S19).
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Shasha Li, Chen Hu, Jianwei Li, Lei Liu, Wei Jing, Wei Tang, Weidong Tian, and Jie Long have declared no conflict of interest.
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All experiments were approved by the Animal Research Committee of Sichuan University and were conducted in accordance with the guidelines for the management and handling of experimental animals.
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Shasha Li, Chen Hu, and Jianwei Li are co-first author and equally contributed to this work.
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Li, S., Hu, C., Li, J. et al. Effect of miR-26a-5p on the Wnt/Ca2+ Pathway and Osteogenic Differentiation of Mouse Adipose-Derived Mesenchymal Stem Cells. Calcif Tissue Int 99, 174–186 (2016). https://doi.org/10.1007/s00223-016-0137-3
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DOI: https://doi.org/10.1007/s00223-016-0137-3