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An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause
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Estrogen, aging and the cardiovascular system.

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Estrogen offers significant cardiovascular protection through antioxidant and anti-inflammatory effects. However, its benefits postmenopause remain unclear, highlighting the need for further research into estrogen

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Area of Science:

  • Cardiovascular Science
  • Endocrinology
  • Molecular Biology

Background:

  • Estrogen exerts pleiotropic effects, including antioxidant and anti-inflammatory actions.
  • Estrogen influences gene expression in the vasculature and heart.
  • Cardiovascular protection by estrogen is observed in premenopausal women but not consistently in postmenopausal women.

Purpose of the Study:

  • To explore the multifaceted effects of estrogen on cardiovascular health.
  • To understand the discrepancy between endogenous estrogen's protective role and the outcomes of postmenopausal estrogen replacement therapy.

Main Methods:

  • Investigated estrogen's rapid cellular effects in cultured cardiac myocytes and endothelial cells.
  • Examined estrogen's protective actions in in vivo models of ischemia and trauma/hemorrhage.
  • Considered estrogen's potential impact on soluble epoxide hydrolase expression.

Main Results:

  • Estrogen treatment rapidly activates NF-kappaB and induces heat-shock protein (HSP)-72, conferring protection against simulated ischemia.
  • Estrogens demonstrate protective effects against ischemia and trauma/hemorrhage in vivo.
  • Estrogen may reduce soluble epoxide hydrolase, potentially mitigating cardiovascular harm.

Conclusions:

  • Estrogen possesses potent cardioprotective properties mediated by antioxidant and anti-inflammatory pathways.
  • The complex actions of estrogen, particularly in aging and postmenopause, require further elucidation.
  • Current understanding of estrogen's diverse effects is insufficient to explain inconsistent clinical trial outcomes.