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Related Experiment Videos

Endogenous estrogens influence endothelial function in young men.

Robert Lew1, Paul Komesaroff, Maro Williams

  • 1Baker Medical Research Institute and Alfred Hospital, Prahran, Victoria, Australia.

Circulation Research
|November 1, 2003
PubMed
Summary

Suppression of male estrogen using aromatase inhibitors impairs endothelial function, specifically flow-mediated dilation, in healthy young men. This suggests endogenous estrogens directly regulate male endothelial health.

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Area of Science:

  • Endocrinology
  • Cardiovascular Physiology
  • Metabolism

Background:

  • Males produce endogenous estrogen from testosterone via aromatase.
  • Previous studies suggest a role for endogenous estrogens in male cardiovascular function.

Purpose of the Study:

  • To examine the effects of endogenous estrogen suppression via aromatase inhibition on endothelial function, systemic arterial compliance, and lipoprotein levels in healthy young men.

Main Methods:

  • A placebo-controlled, double-blind, randomized study involving 20 healthy men (aged 18-32).
  • Participants received either anastrozole (aromatase inhibitor) or placebo for 6 weeks.
  • Assessed hormone levels, lipids, C-reactive protein (CRP), homocysteine, flow-mediated dilation (endothelial function), and systemic arterial compliance.

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Main Results:

  • Aromatase inhibition significantly decreased 17beta-estradiol levels.
  • Flow-mediated dilation significantly decreased in the anastrozole group but not the placebo group.
  • No significant changes were observed in systemic arterial compliance, lipoproteins, testosterone, DHEA, CRP, or homocysteine.

Conclusions:

  • Suppression of endogenous estrogens with an aromatase inhibitor impairs endothelial function (flow-mediated dilation) in young healthy men.
  • Endogenous estrogens appear to play a direct regulatory role in male endothelial function.
  • Aromatase inhibition did not affect systemic arterial compliance or key metabolic markers in this cohort.