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Related Experiment Videos

Monocyte-derived clastogenic factor in rheumatoid arthritis.

I Emerit1, A Levy, J P Camus

  • 1Laboratoire de Génétique, Université Paris VI, France.

Free Radical Biology & Medicine
|January 1, 1989
PubMed
Summary

Rheumatoid arthritis patients exhibit increased chromosome breakage due to a clastogenic factor (CF). Monocytes are identified as the primary producers of this factor, which may involve superoxide radicals.

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Area of Science:

  • Immunology
  • Genetics
  • Rheumatology

Background:

  • Rheumatoid arthritis (RA) is associated with increased chromosome breakage in patient blood cultures.
  • A clastogenic factor (CF) present in RA patients induces DNA damage in healthy individuals' cells.

Purpose of the Study:

  • To identify the cellular source of the clastogenic factor (CF) implicated in rheumatoid arthritis (RA).
  • To investigate the mechanism underlying CF production and its potential role in RA pathogenesis.

Main Methods:

  • Isolation and characterization of clastogenic factor (CF) from patient samples and cell cultures.
  • Co-culture experiments involving lymphocytes, monocytes, neutrophils, and platelets.
  • Assessment of chromosome damage in response to CF.

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  • Evaluation of the effects of superoxide dismutase and arachidonic acid metabolism inhibitors.

    • Main Results:

    • Clastogenic factor (CF) was detected in plasma, synovial fluid, and culture supernatants from RA patients.
    • CF production was significantly correlated with the presence and number of monocytes.
    • Monocytes, particularly adherent ones, were identified as the primary source of CF.
    • Superoxide dismutase demonstrated a protective effect, suggesting a role for superoxide radicals in CF activity.

    Conclusions:

    • Monocytes are the main producers of the clastogenic factor (CF) in rheumatoid arthritis.
    • The superoxide radical (O2-) is likely involved in both the formation and action of CF.
    • Understanding CF production may offer new therapeutic targets for rheumatoid arthritis.