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Changes in circulating monocytes in patients with progressive systemic sclerosis.

B S Andrews1, G J Friou, M A Berman

  • 1Department of Medicine, University of California, Irvine 92717.

The Journal of Rheumatology
|October 1, 1987
PubMed
Summary
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Monocytes in patients with progressive systemic sclerosis (PSS) show advanced maturation and activation. Key differences include reduced peanut agglutinin binding and altered ectoenzyme levels, suggesting immune system changes in PSS.

Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Progressive systemic sclerosis (PSS), also known as scleroderma, is an autoimmune disease characterized by fibrosis and vascular abnormalities.
  • Monocyte abnormalities have been implicated in the pathogenesis of autoimmune diseases, but their specific role in PSS requires further elucidation.

Purpose of the Study:

  • To investigate the characteristics of circulating monocytes in patients with PSS compared to healthy controls.
  • To identify potential cellular and molecular markers associated with monocyte activation and differentiation in PSS.

Main Methods:

  • Analysis of monocyte surface markers using monoclonal antibodies (Leu M2, Leu M3, HLA-DR).
  • Assessment of lectin (peanut agglutinin) binding and enzyme activity (nonspecific esterase, 5'-nucleotidase, alkaline phosphodiesterase 1, leucine aminopeptidase).

Related Experiment Videos

  • Correlation of monocyte findings with serum levels of interferon-gamma and C1q binding complexes, and disease duration.

    • Main Results:

    • PSS monocytes exhibited significantly reduced peanut agglutinin binding and nonspecific esterase staining, indicative of advanced maturation.
    • A significant reduction in Leu M2 antigen-bearing monocytes (macrophage-related antigen) was observed in PSS patients.
    • Elevated leucine aminopeptidase (LAP) levels and altered ectoenzyme profiles (5'N, APD1) in PSS monocytes suggested immune activation. LAP levels correlated strongly with Leu M3 positive cells and inversely with C1q binding complexes.

    Conclusions:

    • Monocytes in PSS patients display distinct features of advanced differentiation and activation compared to normal controls.
    • These monocyte alterations may contribute to the immune dysregulation observed in progressive systemic sclerosis.
    • Specific cell surface markers and enzyme activities could serve as potential biomarkers for PSS immune activation.