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Complement activation in hypercholesterolemia.

A L Pasqui1, G Bova, L Puccetti

  • 1Department of Internal Medicine and Immunology, University of Siena, Italy.

Nutrition, Metabolism, and Cardiovascular Diseases : NMCD
|September 28, 2000
PubMed
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Complement activation, indicated by increased sC5b-9, is linked to dyslipidemia and atherosclerosis. This may be driven by cholesterol immune complexes and reduced HDL, affecting endothelial function.

Area of Science:

  • Immunology
  • Cardiovascular Science
  • Biochemistry

Background:

  • Atherosclerosis involves both inflammatory and lipid factors.
  • Dyslipidemia is a key risk factor for cardiovascular disease.

Purpose of the Study:

  • To investigate the relationship between lipid profiles, complement system activation, and endothelial dysfunction in dyslipidemic subjects.
  • To explore the role of cholesterol-containing immune complexes (chol-CIC) and soluble intercellular adhesion molecule-1 (sICAM-1) in this process.

Main Methods:

  • Comparison of complement system components (CH50, C3, C4, sC5b-9), chol-CIC, and sICAM-1 levels in hypercholesterolemic patients, patients with clinical atherosclerosis, and normal subjects.
  • Regression analysis to determine relationships between sC5b-9, HDL-cholesterol, and total cholesterol.

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Main Results:

  • Significantly elevated terminal complement complex (sC5b-9) in hypercholesterolemic and atherosclerosis patients compared to controls.
  • Inverse correlation between plasma sC5b-9 and HDL-cholesterol levels.
  • Increased chol-CIC and sICAM-1 in patient groups, suggesting immune complex involvement and endothelial dysfunction.

Conclusions:

  • Complement activation in dyslipidemia may be triggered by increased immune complexes.
  • Reduced levels of complement regulatory proteins on HDL contribute to complement activation.
  • Complement system alterations are linked to endothelial dysfunction and potentially other systemic factors.