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Related Experiment Videos

Low-dose estrogen supplementation improves vascular function in hypogonadal men.

P A Komesaroff1, M Fullerton, M D Esler

  • 1Hormones and Vasculature Laboratory and Alfred and Baker Medical Unit, Baker Medical Research Institute and Alfred Hospital, Melbourne, Victoria, Australia.

Hypertension (Dallas, Tex. : 1979)
|November 17, 2001
PubMed
Summary

Estrogen supplementation in hypogonadal men improved vascular function and lowered blood pressure. This suggests a potential role for estrogens in reducing cardiovascular risk in men.

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Area of Science:

  • Endocrinology
  • Cardiovascular Medicine
  • Pharmacology

Background:

  • Estrogens are known to protect women against cardiovascular disease, but their role in men is unclear.
  • Hypogonadal men have low estrogen levels, and endogenous estrogens may be important for cardiovascular health.
  • Preliminary evidence suggests estrogens produced via androgen aromatization play a physiological role in men.

Purpose of the Study:

  • To investigate the cardiovascular effects of estrogen supplementation in hypogonadal men.
  • To assess the impact of estrogen on vascular responsiveness to vasoactive agents.
  • To evaluate the safety and tolerability of low-dose estrogen therapy in this population.

Main Methods:

  • 12 hypogonadal men (mean age 68.7 years) received 8 weeks of either estradiol valerate (1 mg daily) or placebo.

Related Experiment Videos

  • Forearm resistance artery responsiveness was measured using venous occlusion plethysmography.
  • Vasoactive agents including N(G)-monomethyl-L-arginine, angiotensin II, norepinephrine, acetylcholine, and sodium nitroprusside were infused.

    • Main Results:

    • Estrogen treatment significantly reduced systolic and diastolic blood pressure.
    • HDL cholesterol levels increased significantly after estrogen supplementation.
    • Estrogen enhanced vasoconstrictor responses to N(G)-monomethyl-L-arginine and attenuated responses to angiotensin II and norepinephrine.
    • Vasodilator responses to acetylcholine and sodium nitroprusside were not altered by estrogen.
    • No adverse effects were reported with estrogen supplementation.

    Conclusions:

    • Low-dose estrogen supplementation is well-tolerated in hypogonadal men.
    • Estrogen therapy can lower blood pressure and improve vascular reactivity, potentially through enhanced nitric oxide release and reduced vasoconstrictor sensitivity.
    • These findings suggest a potential clinical role for estrogens in cardiovascular risk reduction for specific male populations.