Related Experiment Videos

Constantly low HDL-cholesterol concentration relates to endothelial dysfunction and increased in vivo LDL-oxidation

J O Toikka1, M Ahotupa, J S Viikari

  • 1Department of Clinical Physiology, Turku University Central Hospital, Turku, Finland.

Atherosclerosis
|October 19, 1999
PubMed

Insights

Low high-density lipoprotein cholesterol (HDL-C) is linked to impaired vascular endothelial function and increased oxidative stress in young men. This suggests HDL particles protect against endothelial dysfunction and LDL oxidation, potentially reducing atherosclerosis risk.

Area of Science:

  • Cardiovascular Medicine
  • Lipid Metabolism
  • Endothelial Function

Background:

  • Low high-density lipoprotein cholesterol (HDL-C) is a risk factor for atherosclerosis.
  • The role of HDL-C in endothelial function and lipoprotein oxidation requires further elucidation.

Purpose of the Study:

  • To investigate the impact of low HDL-C on vascular endothelial function and low-density lipoprotein (LDL) oxidation in young men.
  • To determine the correlation between HDL-C levels, endothelial function, and LDL oxidation.

Main Methods:

  • Prospective classification of young men (n=20) into low or high HDL-C groups.
  • Measurement of endothelium-dependent flow-mediated dilation (FMD) of the brachial artery.
  • Assessment of in vivo LDL oxidation (ox-LDL) via LDL diene conjugation.

Main Results:

  • Endothelial function (FMD) was significantly impaired in the low HDL-C group compared to the high HDL-C group (0.2+/-1.2% vs 5.5+/-3.2%, P<0.001).
  • Low HDL-C group exhibited higher levels of ox-LDL compared to the high HDL-C group (22.9+/-4.4 vs 18.0+/-1.8, P
  • FMD correlated positively with HDL-C and HDL(2)-C, and negatively with ox-LDL (P<0.05 for all).

Conclusions:

  • Constantly low HDL-C concentration is associated with endothelial dysfunction and increased oxidative stress in healthy young men.
  • HDL particles may play a protective role for the endothelium and inhibit LDL oxidation.
  • Findings suggest a mechanism linking low HDL-C to increased atherosclerosis risk.

Related Concept Videos