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Association between plasma lipoprotein(a) and endothelial dysfunction in normocholesterolemic and non-diabetic

Tatsuya Ioka1, Hiromi Tasaki, Akira Yashiro

  • 1Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.

Circulation Journal : Official Journal of the Japanese Circulation Society
|April 2, 2002
PubMed

Insights

Elevated lipoprotein(a) (Lp(a)) levels are linked to impaired endothelial function in normal coronary arteries. This suggests Lp(a) may predict endothelial dysfunction even in individuals without high cholesterol or diabetes.

Area of Science:

  • Cardiovascular Medicine
  • Clinical Chemistry
  • Human Physiology

Background:

  • Endothelial dysfunction is a key factor in atherosclerosis.
  • Lipoprotein(a) (Lp(a)) is an independent risk factor for cardiovascular disease.
  • The role of Lp(a) in endothelial function in healthy individuals is not fully understood.

Purpose of the Study:

  • To investigate the relationship between elevated lipoprotein(a) (Lp(a)) levels and impaired endothelium-dependent vasoreactivity.
  • To assess this relationship in normocholesterolemic and non-diabetic individuals with normal coronary arteries.

Main Methods:

  • Acetylcholine (ACh) was administered via left main coronary artery injection in 31 patients.
  • Coronary artery diameter changes in response to ACh and nitroglycerin were measured.
  • Correlation and stepwise multiple regression analyses were performed between lipid levels and vasoreactivity.

Main Results:

  • Coronary arteries showed impaired vasodilation in response to ACh, indicating endothelial dysfunction.
  • Nitroglycerin administration resulted in vasodilation, confirming arterial responsiveness.
  • A significant negative correlation was found between Lp(a) levels and the degree of vasodilation.
  • Stepwise regression analysis identified Lp(a) as the sole significant lipid predictor of impaired vasodilation.

Conclusions:

  • Elevated plasma Lp(a) levels are associated with endothelial dysfunction in subjects with normal coronary arteries.
  • Lp(a) may serve as a predictive marker for endothelial dysfunction, independent of cholesterol and glucose levels.
  • These findings highlight the importance of Lp(a) in early cardiovascular health assessment.

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