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Journal of Orthopaedic Surgery and Research

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Open Access 01-12-2024 | Osteoarthrosis | Research article

PDK4 inhibits osteoarthritis progression by activating the PPAR pathway

Authors: Zhengnan Li, Lifeng Xie, Hui Zeng, Yaohong Wu

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2024

Abstract

Background

Osteoarthritis (OA) is a degenerative joint disease caused by the deterioration of cartilage. However, the underlying mechanisms of OA pathogenesis remain elusive.

Methods

Hub genes were screened by bioinformatics analysis based on the GSE114007 and GSE169077 datasets. The Sprague–Dawley (SD) rat model of OA was constructed by intra-articular injection of a mixture of papain and L-cysteine. Hematoxylin–eosin (HE) staining was used to detect pathological changes in OA rat models. Inflammatory cytokine levels in serum were measured employing the enzyme-linked immunosorbent assay (ELISA). The reverse transcription quantitative PCR (RT-qPCR) was implemented to assess the hub gene expressions in OA rat models. The roles of PDK4 and the mechanism regulating the PPAR pathway were evaluated through western blot, cell counting kit-8 (CCK-8), ELISA, and flow cytometry assays in C28/I2 chondrocytes induced by IL-1β.

Results

Six hub genes were identified, of which COL1A1, POSTN, FAP, and CDH11 expressions were elevated, while PDK4 and ANGPTL4 were reduced in OA. Overexpression of PDK4 inhibited apoptosis, inflammatory cytokine levels (TNF-α, IL-8, and IL-6), and extracellular matrix (ECM) degradation protein expressions (MMP-3, MMP-13, and ADAMTS-4) in IL-1β-induced chondrocytes. Further investigation revealed that PDK4 promoted the expression of PPAR signaling pathway-related proteins: PPARA, PPARD, and ACSL1. Additionally, GW9662, an inhibitor of the PPAR pathway, significantly counteracted the inhibitory effect of PDK4 overexpression on IL-1β-induced chondrocytes.

Conclusion

PDK4 inhibits OA development by activating the PPAR pathway, which provides new insights into the OA management.

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Title: PDK4 inhibits osteoarthritis progression by activating the PPAR pathway
Authors: Zhengnan Li
Lifeng Xie
Hui Zeng
Yaohong Wu
Publication date: 01-12-2024
Publisher: BioMed Central
Keywords: Osteoarthrosis
Osteoarthrosis
Cytokines
Published in: Journal of Orthopaedic Surgery and Research / Issue 1/2024
Electronic ISSN: 1749-799X
DOI: https://doi.org/10.1186/s13018-024-04583-5

Keynote webinar | Spotlight on medication adherence

Springer Medicine

PDK4 inhibits osteoarthritis progression by activating the PPAR pathway

Abstract

Background

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusion

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