Journal
OSTEOARTHRITIS AND CARTILAGE
Volume 22, Issue 6, Pages 845-851Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.joca.2014.03.011
Keywords
Chondrocyte; Mechanical stress; Celecoxib; Extracellular matrix; Matrix metalloproteinases
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [23792429]
- Grants-in-Aid for Scientific Research [23792429, 23390474] Funding Source: KAKEN
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Objective: Excessive mechanical stress is considered a major cause of temporomandibular joint osteoarthritis (TMJ-OA). High magnitude cyclic tensile strain (CTS) up-regulates pro-inflammatory cytokines and matrix metalloproteinases (MMPs) in chondrocytes, while selective cyclooxygenase (COX)-2 inhibition has been shown to be beneficial to cytokine-induced cartilage damage. However, the effect of selective COX-2 inhibitors on mechanically stimulated chondrocytes remains unclear. This study evaluated the effect of celecoxib, a selective COX-2 inhibitor, on extracellular matrix (ECM) metabolism of mandibular condylar chondrocytes under CTS. Methods: Porcine mandibular chondrocytes were subjected to CTS of 0.5 Hz, 10% elongation with celecoxib for 24 h. The gene expressions of COX-2, MMPs, aggrecanase (ADAMTS), type II collagen and aggrecan were examined by real-time PCR. Also, prostaglandin E2 (PGE2) concentrations were determined using enzyme immunoassay kit. The levels of MMP and transcription factor NF-kappa B were measured by western blot while MMP activity was determined by casein zymography. Results: The presence of celecoxib normalized the release of PGE2 and diminished the CTS-induced COX-2, MMP-1, MMP-3, MMP-9 and ADAMTS-5 gene expressions while recovered the downregulated type II collagen and aggrecan gene expressions. Concurrently, celecoxib showed inhibition of NF-kappa B and suppression of MMP production and activity. Conclusions: Celecoxib exerts protective effects on mandibular condylar chondrocytes under CTS stimulation by diminishing degradation and restoring synthesis of ECM. (C) 2014 Published by Elsevier Ltd on behalf of Osteoarthritis Research Society International.
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