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Related Experiment Videos

The heart as a target for oestrogens.

L Brown1, I Hoong, S A Doggrell

  • 1Department of Physiology and Pharmacology, The University of Queensland, Australia. brown@plpk.uq.edu.au

Heart, Lung & Circulation
|December 15, 2005
PubMed
Summary

Estrogen therapy in postmenopausal women shows reduced cardiovascular disease risk in observational studies, but clinical trials indicate increased coronary events. Further research is needed.

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Area of Science:

  • Cardiovascular Science
  • Endocrinology
  • Pharmacology

Background:

  • Observational studies suggest estrogen reduces cardiovascular disease (CVD) risk in postmenopausal women.
  • Estrogens impact blood lipids and cardiovascular system regulators, potentially lowering CVD risk.
  • The heart possesses functional estrogen receptors in vasculature, myocytes, and fibroblasts.

Purpose of the Study:

  • To review mechanisms of estrogen's physiological effects on healthy and diseased hearts.
  • To reconcile conflicting findings between observational and randomized controlled trials of estrogen therapy for CVD.
  • To identify future research directions for estrogen-based cardiovascular risk reduction.

Main Methods:

  • Literature review of observational studies and randomized controlled trials (RCTs).
  • Analysis of proposed rapid and long-term mechanisms of estrogen action on cardiovascular tissues.
  • Evaluation of clinical trial data regarding estrogen and progestin effects on coronary events and atherosclerosis.

Main Results:

  • Estrogens exert rapid effects like vasodilation and anti-arrhythmic actions, and longer-term effects including nitric oxide synthase induction.
  • Conflicting evidence exists: observational studies show reduced CVD risk, while RCTs (e.g., WHI) indicate increased coronary events, particularly early on.
  • Estrogen's effect on fibroblasts varies: promoting growth in non-proliferating cells but inhibiting proliferation in others.

Conclusions:

  • Estrogen's cardiovascular effects are complex, with rapid and long-term actions on various cardiac components.
  • Clinical trial data challenge the protective role of combined estrogen and progestin therapy in postmenopausal women with existing heart disease.
  • Further studies in animal models and clinical trials with selective estrogen receptor modulators (SERMs) are warranted to clarify estrogen's role in cardiovascular risk reduction for both sexes.

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