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[Lipids and blood vessels]

H Drexel1, F W Amann

  • 1Departement für Innere Medizin, Universitätsspital Zürich.

Schweizerische Rundschau Fur Medizin Praxis = Revue Suisse De Medecine Praxis
|November 23, 1993
PubMed
Summary

Atherosclerosis involves atheroma formation due to cholesterol buildup. High low-density lipoprotein (LDL) and low high-density lipoprotein (HDL2) cholesterol levels increase atherosclerosis risk.

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Area of Science:

  • Cardiovascular Science
  • Biochemistry
  • Pathology

Context:

  • Atherosclerosis, characterized by atheroma formation, is a significant cardiovascular disease.
  • Atheromas consist of intracellular and extracellular cholesterol esters, located subendothelially.
  • A strong link between blood cholesterol levels and atheroma development is long suspected.

Purpose:

  • To elucidate the role of lipoproteins, specifically low-density lipoproteins (LDL) and high-density lipoproteins (HDL), in the pathogenesis of atherosclerosis.
  • To explain the mechanism of atheroma formation initiated by LDL deposition in the arterial intima.
  • To highlight the importance of reverse cholesterol transport by HDL2 in preventing atherosclerosis.

Summary:

  • Cholesterol esters form atheromas, with blood cholesterol's role implicated.
  • Low-density lipoproteins (LDL) carry cholesterol; impaired receptor uptake leads to plasma accumulation and arterial intima deposition, initiating atheroma.
  • High-density lipoproteins (HDL), particularly HDL2, facilitate reverse cholesterol transport, returning excess cholesterol to the liver.

Impact:

  • Atherosclerotic disease risk is determined by the ratio of LDL to HDL2 cholesterol.
  • Defects in reverse cholesterol transport (low HDL2) or excessive cholesterol load (high LDL) are key factors in coronary atherosclerosis.
  • Triglycerides contribute indirectly to atherogenicity by reducing HDL2 levels.

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