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Mechanisms of methotrexate action in rheumatoid arthritis. Selective decrease in synovial collagenase gene expression

G S Firestein1, M M Paine, D L Boyle

  • 1Department of Medicine, San Diego Medical Center, University of California.

Arthritis and Rheumatism
|February 1, 1994
PubMed
Summary
This summary is machine-generated.

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Methotrexate (MTX) treatment for rheumatoid arthritis (RA) significantly reduces synovial collagenase gene expression. This effect is likely indirect, altering the cytokine environment rather than directly impacting gene expression.

Area of Science:

  • Rheumatology
  • Molecular Biology
  • Pharmacology

Background:

  • Rheumatoid arthritis (RA) is characterized by synovial inflammation and joint destruction.
  • Matrix metalloproteinases (MMPs), including collagenase and stromelysin, play a key role in joint degradation.
  • The tissue inhibitor of metalloproteinases 1 (TIMP-1) regulates MMP activity.

Purpose of the Study:

  • To investigate the impact of methotrexate (MTX) on synovial collagenase, stromelysin, and TIMP-1 gene expression in patients with RA.
  • To explore the potential mechanisms underlying MTX's therapeutic effects in RA.

Main Methods:

  • Prospective study involving serial synovial biopsies from RA patients undergoing MTX therapy.
  • Quantitative in situ hybridization with computer-assisted image analysis to measure synovial gene expression (mRNA levels).

Related Experiment Videos

  • In vitro experiments using fibroblast-like synoviocytes to assess direct effects of MTX on gene expression.

    • Main Results:

    • MTX treatment led to clinical improvements in RA patients, including reduced joint counts and inflammation.
    • Synovial collagenase gene expression significantly decreased after MTX therapy (P = 0.006).
    • No significant changes were observed in stromelysin or TIMP-1 mRNA levels following MTX treatment, either in vivo or in vitro.

    Conclusions:

    • MTX therapy effectively reduces collagenase gene expression in the RA synovium.
    • The observed decrease in collagenase expression is likely an indirect consequence of MTX altering the synovial cytokine milieu.
    • MTX does not appear to directly affect collagenase or TIMP-1 gene expression in synoviocytes.