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Atherosclerosis and autoimmunity

M F Lopes-Virella1, G Virella

  • 1Ralph H. Johnson Department of Veterans Affairs Medical Center, Charleston, South Carolina 29403.

Clinical Immunology and Immunopathology
|November 1, 1994
PubMed
Summary
This summary is machine-generated.

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Humoral autoimmunity, involving autoantibodies and immune complexes against oxidized LDL, plays a significant role in atherosclerosis pathogenesis. These immune responses contribute to lesion development and inflammation.

Area of Science:

  • Immunology
  • Cardiovascular Research
  • Pathogenesis of Atherosclerosis

Background:

  • Immunological mechanisms have been implicated in atherosclerosis since the 1970s.
  • Both humoral and cellular immunity are proposed to influence atheromatous lesion development.
  • Autoantibodies and immune complexes show significant experimental support in atherosclerosis theories.

Purpose of the Study:

  • To explore the role of humoral autoimmunity in the pathogenesis of atherosclerosis.
  • To investigate the impact of modified lipoproteins, specifically oxidized LDL, on immune responses.
  • To elucidate the mechanisms by which immune complexes contribute to atheroma formation and progression.

Main Methods:

  • Detection of anti-oxidized LDL antibodies in circulation and atheromatous plaques.

Related Experiment Videos

  • Isolation of LDL-anti-LDL immune complexes (LDL-IC) from patient serum.
  • In vitro studies on the effects of LDL-IC on human macrophages and fibroblasts.
  • Main Results:

    • Oxidized LDL elicits humoral immune responses in animals and humans.
    • LDL-IC induce intracellular cholesteryl ester accumulation in macrophages and fibroblasts.
    • LDL-IC exposure leads to overexpression of LDL receptors and release of IL-1 and TNF-alpha.

    Conclusions:

    • Humoral autoimmunity, particularly involving oxidized LDL and immune complexes, is strongly suggested in atherosclerosis pathogenesis.
    • Cytokine release (IL-1, TNF-alpha) induced by LDL-IC may promote endothelial dysfunction and smooth muscle cell proliferation.
    • Evidence supports a significant role for humoral autoimmune responses in the development and progression of atherosclerotic lesions.