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Related Experiment Videos

Ovariectomy attenuates hyperpolarization and relaxation mediated by endothelium-derived hyperpolarizing factor in

Ming-Yue Liu1, Yuichi Hattori, Atsushi Sato

  • 1Department of Pharmacology, Hokkaido University School of Medicine, Sapporo, Japan.

Journal of Cardiovascular Pharmacology
|November 27, 2002
PubMed
Summary

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Estrogen deficiency impairs vascular relaxation and hyperpolarization mediated by endothelium-derived hyperpolarizing factor (EDHF). Reduced expression of connexin-43 may explain these effects in estrogen-deficient states.

Area of Science:

  • Cardiovascular physiology
  • Endocrinology
  • Vascular biology

Background:

  • Estrogen status influences cardiovascular disease incidence.
  • Endothelium-derived hyperpolarizing factor (EDHF) mediates vascular hyperpolarization and relaxation.
  • Estrogen deficiency may alter EDHF responses.

Purpose of the Study:

  • To investigate the impact of in vivo estrogen manipulation on EDHF-mediated vascular responses.
  • To explore the mechanisms behind altered EDHF responses in estrogen deficiency.

Main Methods:

  • Isolated mesenteric arteries from sham-operated, ovariectomized (OVX), and OVX with 17beta-estradiol replacement (OVX + E) female rats.
  • Vascular relaxation and hyperpolarization assessed using Ca ionophore A23187 and CPA.
  • Inhibition studies with N-nitro-L-arginine, apamin, charybdotoxin, and 18 alpha-glycyrrhetinic acid.

Related Experiment Videos

  • Immunohistochemical analysis of connexin-43 expression.

    • Main Results:

    • Estrogen deficiency (OVX) significantly reduced EDHF-mediated vascular relaxation and hyperpolarization.
    • These effects were restored in OVX + E rats.
    • Reduced connexin-43 expression was observed in OVX arteries compared to controls and OVX + E arteries.
    • Gap junction inhibition attenuated EDHF responses in control arteries.

    Conclusions:

    • Estrogen deficiency specifically impairs EDHF-mediated vascular actions.
    • Reduced expression of connexin-43, a component of myoendothelial gap junctions, may contribute to impaired EDHF responses in estrogen-deficient states.