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Chondrogenic Differentiation Induction of Adipose-derived Stem Cells by Centrifugal Gravity
Published on: February 24, 2017
miR-20a-5p regulated SMAD6 to inhibit chondrogenesis of hDPSCs
Xuefeng Pan1,2, Xinqi Huang1,2, Bo Zhang1,2
1State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
Objectives:
Chondrogenic differentiation of human dental pulp stem cells (hDPSCs) is highly promising for cartilage repair. The specific mechanism, however, still needs to be explicated.
Materials And Methods:
In this study, we isolated hDPSCs and transfected cells with lentiviruses containing an over-expression, knock-down, or negative control of miR-20a-5p. Three-D pellet cultures of hDPSCs were used for the chondrogenic induction. Following the pellet culture period, chondrogenesis was assessed by histological and immunohistochemical analysis and expression of chondrogenic-related genes. Dual-luciferase report assay was performed to determine potential targeted genes of miR-20a-5p, and the phosphorylation levels of P65 and IκBα were explored. Animal experiments were performed to determine the effect of miR-20a-5p on cartilage regeneration.
Results:
miR-20a-5p was showed to repress the expression of SMAD6 to inhibit the chondrogenic differentiation of hDPSCs. Accordingly, the knock-down of miR-20a-5p promoted cartilage regeneration in the osteochondral defects of rats. Mechanically, it is indicated that NF-κB signaling is the potential down-stream network of miR-20a-5p/Smad6 crosstalk during chondrogenic differentiation.
Conclusions:
miR-20a-5p could target SMAD6 to activate NF-κB signaling pathway, and thus inhibit chondrogenesis of hDPSCs, which provided promising therapeutic target for cartilage defects clinically.
Insights
MicroRNA-20a-5p inhibits cartilage repair by targeting SMAD6 and activating NF-κB signaling. Reducing miR-20a-5p promotes cartilage regeneration in rats, offering a potential therapeutic strategy for cartilage defects.
Area of Science:
- Regenerative Medicine
- Molecular Biology
- Stem Cell Biology
Background:
- Human dental pulp stem cells (hDPSCs) hold significant potential for cartilage repair.
- The precise molecular mechanisms governing hDPSCs' chondrogenic differentiation require further elucidation.
Purpose of the Study:
- To investigate the role of miR-20a-5p in the chondrogenic differentiation of hDPSCs.
- To explore the underlying molecular mechanisms, including targeted genes and signaling pathways.
- To assess the therapeutic potential of modulating miR-20a-5p for cartilage regeneration.
Main Methods:
- hDPSCs were manipulated for miR-20a-5p overexpression or knockdown using lentiviral vectors.
- Chondrogenic differentiation was induced using 3D pellet cultures, followed by histological and gene expression analyses.
- Dual-luciferase reporter assays identified target genes, and Western blotting assessed NF-κB pathway activation (p65 and IκBα phosphorylation).
- In vivo studies in rats evaluated the effect of miR-20a-5p modulation on osteochondral defect repair.
Main Results:
- miR-20a-5p was identified as a repressor of SMAD6, thereby inhibiting hDPSCs chondrogenesis.
- Knockdown of miR-20a-5p significantly enhanced cartilage regeneration in a rat model of osteochondral defects.
- The study indicated that the miR-20a-5p/SMAD6 interaction activates the NF-κB signaling pathway.
Conclusions:
- miR-20a-5p targets SMAD6, leading to NF-κB pathway activation and subsequent inhibition of chondrogenesis in hDPSCs.
- Modulating miR-20a-5p presents a promising therapeutic avenue for treating cartilage defects.
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