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Related Experiment Videos

Progesterone modulates estradiol actions: acute effects at physiological concentrations.

H Teoh1, R Y Man

  • 1Department of Pharmacology, Faculty of Medicine, The University of Hong Kong, China.

European Journal of Pharmacology
|September 9, 1999
PubMed
Summary

Progesterone, a component of hormone replacement therapy, may counteract estrogen's heart-protective effects. This study shows progesterone can acutely affect blood vessels, potentially reducing estrogen's benefits.

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Area of Science:

  • Cardiovascular Pharmacology
  • Endocrinology
  • Vascular Biology

Background:

  • Hormone replacement therapy (HRT) often combines estrogen and progestin.
  • Estrogen is known for its cardioprotective effects.
  • The impact of progestin on estrogen's vascular actions requires further elucidation.

Purpose of the Study:

  • To investigate the acute in vitro vascular effects of progesterone.
  • To determine if progesterone interferes with estrogen-mediated vasodilation.
  • To examine the interaction between progesterone and vasodilators at physiological concentrations.

Main Methods:

  • Utilized isolated porcine coronary artery rings.
  • Assessed vascular smooth muscle relaxation in response to various stimuli.

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  • Investigated the effects of progesterone (1 nM and high microM) alone and in combination with 17beta-estradiol (1 nM) or vasodilators (bradykinin, calcium ionophore A23187, sodium nitroprusside, levcromakalim).

    • Main Results:

    • High concentrations of progesterone relaxed pre-contracted coronary artery rings.
    • Low physiological concentrations (1 nM) of progesterone impaired bradykinin- and calcium ionophore-induced relaxation.
    • Progesterone diminished the potentiating effects of 17beta-estradiol on sodium nitroprusside- and levcromakalim-induced relaxation.

    Conclusions:

    • Progesterone exhibits acute in vitro vascular effects at physiologically relevant concentrations.
    • Progesterone may antagonize the vasodilatory and cardioprotective actions of estrogen.
    • Findings support in vivo observations that progesterone can reduce the beneficial vascular effects of estrogens.