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Activation of the P38/CREB/MMP13 Axis is Associated with Osteoarthritis

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Specialty Pharmacology
Date 2019 Jul 17
PMID 31308631
Citations 23
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Abstract

Purposes: Osteoarthritis (OA) is a common joint disease characterized by the degradation of articular cartilage and joint inflammation. Interleukin-1ß induces P38/cAMP response element binding protein (CREB) pathway activation, resulting in increased expression of matrix metallopeptidase-13 (MMP13) in chondrocytes. However, the role of the P38/CREB/MMP13 axis is unclear in the progression of OA. In this study, we aimed to answer the following questions: (1) how does the P38/CREB/MMP13 axis in cartilage from patients with OA compare with control specimens? (2) Can the P38 agonist anisomycin (ANS) induce mouse OA?

Materials And Methods: Surgical specimens of human cartilage were divided into OA and control groups. Surgical specimens of mouse cartilage were divided into control and ANS-induced groups. Safranin O staining of the cartilage tissues was performed to evaluate the extracellular matrix. Reverse transcription-polymerase chain reaction was performed using these tissues to investigate messenger RNA expressions of type II collagen, aggrecan, MMP13, and ADAM metallopeptidase with thrombospondin type 1 motif 5. Phosphorylated (p)-P38, p-CREB, and MMP13 were evaluated by Western blot analysis. Anisomycin was used to activate P38, and p-P38, p-CREB, and MMP13 were evaluated by immunofluorescence and Western blot analysis.

Results: Safranin O staining showed that the extracellular matrix degraded in humans with OA and ANS-induced mouse cartilage samples. The expressions of p-P38, p-CREB, and MMP13 were all upregulated in osteoarthritic cartilage or anisomycin-induced chondrocytes, suggesting that the P38/CREB/MMP13 axis may play a role in the progression of OA.

Conclusions: The P38/CREB/MMP13 axis is active in osteoarthritic chondrocytes and may cause the degeneration of cartilage. Effective new therapy directed against this pathway could be developed.

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