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Published on: March 18, 2022
MiR-19b-3p Attenuates Chondrocytes Injury by Inhibiting MAPK/NF-Κb Axis via Targeting SOCS1
Liang Shi1, Liang Duan1, Dapeng Duan1
1Department of Orthopedics, Shaanxi Provincial People's Hospital, Xi'an 710068, Shaanxi, China.
Abstract:
In this study, miR-19b-3p was downregulated in osteoarthritic cartilage tissues and IL-1β-stimulated primary chondrocytes, and miR-19b-3p overexpression reversed the inhibitory effect of IL-1β on cell viability, the promotion effects of apoptosis, inflammatory factor secretion and extracellular matrix degradation, whereas the opposite effect was observed with miR-19b-3p inhibitor. Moreover, SOCS1 is a target gene of miR-19b-3p. Furthermore, SOCS1 overexpression enhanced cell injury compared with IL-1β alone treatment, whereas knockdown of SOCS1 restored cell damage caused by IL-1β. Further studies revealed that miR-19b-3p promoted chondrocyte injury repair by suppressing SOCS1 expression, and we found that was mediated by blocking the MAPK/NF-κB axis. Taken together, our findings may provide a new therapeutic strategy for osteoarthritis.
Insights
MicroRNA-19b-3p (miR-19b-3p) is reduced in osteoarthritis. Restoring miR-19b-3p levels protects cartilage cells by inhibiting SOCS1 and blocking inflammatory pathways, offering a potential osteoarthritis treatment.
Area of Science:
- Biomedical Science
- Molecular Biology
- Orthopedics
Background:
- Osteoarthritis (OA) is a degenerative joint disease characterized by cartilage breakdown.
- Inflammation, driven by factors like Interleukin-1 beta (IL-1β), plays a key role in OA pathogenesis.
- MicroRNAs (miRNAs) are emerging as critical regulators in OA development and progression.
Purpose of the Study:
- To investigate the role of miR-19b-3p in osteoarthritis.
- To elucidate the molecular mechanisms underlying miR-19b-3p's function in chondrocytes.
- To explore the therapeutic potential of modulating miR-19b-3p in OA.
Main Methods:
- Analysis of miR-19b-3p expression in osteoarthritic cartilage and IL-1β-stimulated chondrocytes.
- Overexpression and inhibition of miR-19b-3p in vitro.
- Identification and validation of Signal Transducer and Activator of Transcription 1 (STAT1) as a direct target of miR-19b-3p.
- Assessment of cell viability, apoptosis, inflammatory cytokine secretion, and extracellular matrix degradation.
- Investigation of the involvement of the MAPK/NF-κB signaling pathway.
Main Results:
- miR-19b-3p was significantly downregulated in osteoarthritic cartilage and IL-1β-treated chondrocytes.
- miR-19b-3p overexpression ameliorated IL-1β-induced chondrocyte injury, including reduced viability, increased apoptosis, elevated inflammatory factors, and ECM degradation.
- Signal Transducer and Activator of Transcription 1 (STAT1) was identified as a direct target of miR-19b-3p, with its overexpression exacerbating IL-1β-induced damage.
- miR-19b-3p protected chondrocytes by suppressing STAT1 expression, which involved the inhibition of the MAPK/NF-κB signaling axis.
Conclusions:
- miR-19b-3p acts as a protective factor against IL-1β-induced chondrocyte injury in osteoarthritis.
- The therapeutic effect of miR-19b-3p is mediated through the suppression of STAT1 and subsequent blockade of the MAPK/NF-κB pathway.
- Modulating miR-19b-3p represents a promising therapeutic strategy for osteoarthritis treatment.
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