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    Correlation of protease-activated receptor-2 expression and synovitis in rheumatoid and osteoarthritis

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    Author
    Walsh, David A
    Keyword
    Synovitis
    Osteoarthritis
    Date
    2012-10
    
    Metadata
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    Publisher's URL
    https://link.springer.com/article/10.1007/s00296-011-2102-9
    Abstract
    Protease-activated receptor-2 (PAR-2) is known to be pro-inflammatory and increasing evidence points to an inflammatory component in osteoarthritis. This investigation examined the relationship between synovitis and PAR-2 expression, histological and immunohistochemical analysis being performed on synovial samples obtained from OA and RA patients, along with non-arthritic samples obtained by post mortem (PM). Samples were also analysed for PAR-4 expression, this receptor also having putative pro-inflammatory roles. Analysis involved comparison of inflammatory indices (synovial thickness and monocyte infiltration) with expression of PAR-2 and PAR-4. Synovial explants were also analysed for TNFα generation in the presence of a PAR-2 antagonist (ENMD-1068) or vehicle. OA synovia showed heterogeneity of inflammatory indicators, some samples overlapping with those from the RA cohort whilst others appeared similar to the PM cohort. PAR-2 expression, both in the lining layer and the interstitium, correlated strongly and significantly with synovial thickness (r = 0.91) and monocyte infiltration (r = 0.83), respectively (P < 0.001 in both cases), and this remains significant on individual cohort analysis. PAR-2 was co-localised to CD3 and CD68 cells in RA and OA synovium as well as fibroblasts derived from these synovia. PAR-4 was also expressed, but the relationship with inflammatory indicators was substantially weaker. Inflammatory indicators in OA synovia showed considerable variability, but correlated strongly with PAR-2 expression, suggesting PAR-2 upregulation in synovitis. Heterogeneity of inflammatory indicators was paralleled by wide variation in TNFα generation between samples. Secretion of this cytokine was dose-dependently inhibited by ENMD-1068, providing evidence of a functional role for PAR-2 in promoting synovitis.
    Citation
    Tindell, AG, Kelso, EB, Ferrell, WR, Lockhart, JC, Walsh, DA, Dunning, L & McInnes, IB 2012, ‘Correlation of protease-activated receptor-2 expression and synovitis in rheumatoid and osteoarthritis’, RHEUMATOLOGY INTERNATIONAL -BERLIN-, vol. 32, no. 10, pp. 3077–3086
    Publisher
    Rheumatology International
    Type
    Article
    URI
    http://hdl.handle.net/20.500.12904/15370
    Collections
    Rheumatology

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