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Related Experiment Videos

Nitric oxide in osteoarthritis.

R Studer1, D Jaffurs, M Stefanovic-Racic

  • 1Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.

Osteoarthritis and Cartilage
|July 27, 1999
PubMed
Summary

Activated chondrocytes produce nitric oxide (NO), a key factor in osteoarthritis (OA) pathogenesis. Endogenously produced NO inhibits cartilage matrix synthesis by interfering with growth factors.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Rheumatology

Background:

  • Activated articular chondrocytes produce significant nitric oxide (NO).
  • Nitric oxide (NO) is implicated in the pathogenesis of osteoarthritis (OA).
  • Endogenously produced NO likely exerts local effects within cartilage due to its short half-life.

Purpose of the Study:

  • To investigate the role of endogenously produced nitric oxide (NO) in regulating chondrocyte matrix synthesis.
  • To determine if NO inhibits matrix synthesis independently of apoptosis.
  • To explore the mechanism by which NO affects matrix production, particularly in response to growth factors.

Main Methods:

  • Transduction of chondrocytes with the inducible nitric oxide synthase (iNOS or NOS-2) gene to achieve endogenous NO production.

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  • Assessment of matrix synthesis in response to IL-1 and IGF-1.
  • Evaluation of cell viability to detect apoptosis or cell death.
  • Measurement of TGF-beta(1) production.

    • Main Results:

    • Endogenously produced NO by iNOS-expressing chondrocytes inhibited matrix synthesis.
    • High levels of NO did not induce apoptosis or cell death.
    • Nitric oxide (NO) inhibited TGF-beta(1) production in IL-1-treated cells.
    • NO decreased matrix production in response to IGF-1.

    Conclusions:

    • Endogenously produced nitric oxide (NO) inhibits chondrocyte matrix synthesis.
    • The inhibitory effect of NO on matrix production is not mediated by apoptosis.
    • Nitric oxide (NO) may inhibit matrix synthesis by interfering with autocrine and paracrine signaling pathways, such as those involving TGF-beta(1) and IGF-1.