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MicroRNA-138-5P regulates chondrocyte proliferation and autophagy / 中国组织工程研究
Chinese Journal of Tissue Engineering Research ; (53): 674-678, 2021.
Article in Chinese | WPRIM | ID: wpr-847190
ABSTRACT

BACKGROUND:

Abnormal autophagy in chondrocytes often leads to cartilage degeneration, thereby triggering osteoarthritis. Recent studies have found that microRNAs play an important role in chondrocyte autophagy; however, the molecular mechanism is yet unclear.

OBJECTIVE:

To investigate the role of microRNA-138-5p (miR-138-5p) in the regulation of chondrocyte proliferation and autophagy activities, and to reveal its mechanisms.

METHODS:

Chondrosarcoma cell line SW1353 were cultured in vitro and transfected with negative control miRNA or miR-138-5p mimic. Cell proliferation activity was measured by cell counting kit-8 assay, the expression of matrix metalloproteinases 1, 3, and 13 mRNA was measured by fluorogenic quantitative PCR. The endogenous LC3 subcellular location was detected by immunofluorescence staining. The miR-138-5p and SIRTI mRNA target sites were predicted using TargetScan 7.1 online tool. Autophagy-related proteins and AMPK signal proteins were detected by immunoblotting assay. RESULTS AND

CONCLUSION:

Cells transfected with miR-138-5p mimic, compared with those transfected with negative control miRNA, showed lower proliferation activity, less LC3 puncta, and reduced expression of SIRT1, LC3-II, p-AMPK, but increased protein expression of p62 and increased mRNA expression of matrix metalloproteinases 1, 3, 13. There was a conserved miR-138-5p binding site in the 3’UTR region of SIRT1 mRNA. To conclude, miR-138-5p regulates SW1353 cell autophagy and proliferation through the SIRT1/AMPK signaling pathway. The up-regulated expression of miR-138-5p promotes the secretion of matrix metalloproteinases from chondrocytes, indicating that miR-138-5p plays an important role in the progression of osteoarthritis.

Full text: Available Index: WPRIM (Western Pacific) Language: Chinese Journal: Chinese Journal of Tissue Engineering Research Year: 2021 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Language: Chinese Journal: Chinese Journal of Tissue Engineering Research Year: 2021 Type: Article