Disorders associated with antibodies to endothelial cells

Area of Science:

• Immunology
• Vascular Biology
• Pathology

Background:

• Antibodies binding to endothelial cells are observed in various vasculitis and thrombosis conditions.
• Patient sera contain antibodies and immune complexes that interact with endothelial cells.
• Specific antibodies are associated with conditions like systemic lupus erythematosus, heparin-associated thrombocytopenia, Kawasaki syndrome, and allograft rejection.

Purpose of the Study:

• To review the role of antibodies targeting endothelial cells in diverse vascular disorders.
• To elucidate the mechanisms by which these antibodies contribute to thrombosis and inflammation.
• To highlight the diagnostic and prognostic significance of anti-endothelial cell antibodies.

Main Methods:

• Analysis of patient sera for the presence of anti-endothelial cell antibodies.
• In vitro studies using cultured endothelial cells to assess antibody binding and effects.
• Characterization of antibody targets, including heparin-bound components and induced surface antigens.

Main Results:

• Antibodies in systemic lupus erythematosus bind to endothelial cells via complement-fixing mechanisms.
• Antibodies in heparin-associated thrombocytopenia target heparin on endothelium and heparan sulfate.
• Cytolytic IgM antibodies in Kawasaki syndrome recognize interferon-gamma/interleukin-1/tumor necrosis factor-induced antigens.
• Alloantibodies are linked to thrombotic microvascular injury and hyperacute allograft rejection.
• In vitro, antibody binding initiates platelet adherence, tissue factor production, and plasminogen activator inhibitor secretion.

Conclusions:

• Antibody-mediated endothelial cell injury is a significant factor in vasculitis and thrombosis.
• These antibodies play a role in various vascular pathologies, including those of unknown cause.
• Understanding these antibody-endothelial interactions is crucial for diagnosing and treating vascular diseases.