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Complement activation by anticardiolipin antibodies.

M B Santiago1, N Gaburo, R M de Oliveira

  • 1Laboratory of Investigation in Rheumatology, University of São Paulo, School of Medicine, Brazil.

Annals of the Rheumatic Diseases
|April 1, 1991
PubMed
Summary
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High anticardiolipin antibody levels rarely activate complement. This suggests the complement cascade may not be crucial for associated clinical issues like recurrent abortions or thrombosis.

Area of Science:

  • Immunology
  • Rheumatology
  • Clinical Medicine

Background:

  • Anticardiolipin antibodies are linked to autoimmune conditions.
  • These antibodies are often associated with adverse clinical outcomes such as recurrent pregnancy loss and thrombosis.
  • The role of complement activation in these complications is not fully understood.

Purpose of the Study:

  • To investigate the complement fixation ability of serum samples with high anticardiolipin antibody concentrations.
  • To determine if complement activation by anticardiolipin antibodies correlates with clinical complications.

Main Methods:

  • A haemolytic assay was employed to assess complement fixation.
  • Sixteen serum samples with high anticardiolipin antibody titers were analyzed.

Related Experiment Videos

  • Clinical data regarding pregnancy loss, thrombosis, and thrombocytopenia were collected for patient correlation.

    • Main Results:

    • Only four out of sixteen patients showed complement fixation with their anticardiolipin antibodies.
    • Complement fixation did not directly correlate with the concentration of anticardiolipin antibodies.
    • The majority of patients with high anticardiolipin antibody levels did not activate the complement pathway.

    Conclusions:

    • Anticardiolipin antibodies in most patients with associated clinical complications do not activate the complement pathway.
    • The complement cascade is unlikely to play a significant role in the pathogenesis of complications linked to anticardiolipin antibodies.
    • Further research may be needed to elucidate the mechanisms behind anticardiolipin antibody-associated morbidity.