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Related Experiment Videos

Estrogen restores postischemic pial microvascular dilation.

Y Watanabe1, M T Littleton-Kearney, R J Traystman

  • 1Department of Anesthesiology and Critical Care Medicine, Johns Hopkins Medical Institutions, Baltimore, Maryland 21287, USA.

American Journal of Physiology. Heart and Circulatory Physiology
|June 19, 2001
PubMed
Summary

Estrogen treatment improved cerebral blood vessel function after ischemia in male and ovariectomized female rats. This study shows estrogen protects brain microcirculation from ischemic injury.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Cerebrovascular Research

Background:

  • Estrogen is known to protect the brain from experimental cerebral ischemia.
  • This protection is thought to involve both vascular and neuronal mechanisms.
  • The specific role of estrogen in cerebral microvascular reactivity post-ischemia requires further elucidation.

Purpose of the Study:

  • To investigate if chronic estrogen treatment in males and repletion in ovariectomized (Ovx) females reverses impaired pial arteriolar reactivity after global forebrain ischemia.
  • To determine if the protective site of estrogen action is the vascular endothelium.

Main Methods:

  • Male and Ovx female rats received either placebo or 17 beta-estradiol pellets 10 days prior to ischemia induction (15-min global forebrain ischemia via 4-vessel occlusion).

Related Experiment Videos

  • Intravital microscopy was used to assess pial arteriolar responses to acetylcholine (ACh) and S-nitroso-N-acetyl-penicillamine (SNAP) for vasodilation, and serotonin for vasoconstriction.
  • Vessel diameter changes were measured during early reperfusion (30-60 min) and compared to pre-ischemic values.

    • Main Results:

    • Post-ischemic loss of vasodilation to ACh and SNAP in both male and Ovx female rats was prevented by estrogen treatment.
    • Estrogen administration preserved endothelial- and smooth muscle-mediated vasodilation.
    • Ischemia impaired vasoconstriction to serotonin irrespective of estrogen treatment.

    Conclusions:

    • Estrogen acts as a vasoprotective agent in the cerebral circulation.
    • Estrogen improves microvascular function during acute ischemic events.
    • These findings highlight estrogen's role in mitigating cerebrovascular damage following ischemia.