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Related Experiment Videos

COX-2 in synovial tissues.

L J Crofford1

  • 1Division of Rheumatology, University of Michigan, 5510E MSRB I, 1150 W. Medical Center Dr., Ann Arbor, MI, 48109-0680, USA.

Osteoarthritis and Cartilage
|July 27, 1999
PubMed
Summary
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Cyclooxygenase-2 (COX-2) is upregulated in synovial tissues during inflammatory arthritis, suggesting it drives prostaglandin production. Glucocorticoids can inhibit COX-2 expression in these tissues.

Area of Science:

  • Biochemistry
  • Immunology
  • Rheumatology

Background:

  • Prostaglandins (PGs) mediate acute and chronic inflammation.
  • PG production in synovial tissues involves phospholipase A2s (PLA2s), cyclooxygenases (COXs), and PG synthases.
  • Two COX isoforms, COX-1 and COX-2, are present in synovial tissues.

Purpose of the Study:

  • To investigate the differential expression and regulation of COX-1 and COX-2 in synovial tissues, particularly in the context of inflammatory arthritis.
  • To determine the role of COX-2 in prostaglandin production during synovial inflammation.

Main Methods:

  • Immunohistochemical analysis of COX-1 and COX-2 expression in synovial tissues from inflammatory and non-inflammatory arthritis.
  • In-vitro studies assessing COX-2 expression in synovial cells stimulated with proinflammatory cytokines, phorbol ester, and cell surface receptor agonists.

Related Experiment Videos

  • Evaluation of glucocorticoid effects on COX-2 expression in synovial cells.

    • Main Results:

    • COX-1 is constitutively expressed in synovial lining cells.
    • COX-2 expression is significantly increased in inflammatory arthritis, localized to vascular endothelial cells, inflammatory cells, and fibroblasts.
    • In vitro, COX-2 expression is markedly induced by inflammatory stimuli and inhibited by glucocorticoids.

    Conclusions:

    • COX-2 is upregulated in synovial tissues during inflammatory arthritis.
    • COX-2 is likely responsible for the increased local prostaglandin production associated with synovial inflammation.
    • COX-2 represents a potential therapeutic target for managing inflammatory arthritis.