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Stroke in estrogen receptor-alpha-deficient mice
K Sampei1, S Goto, N J Alkayed
1Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
Stroke
|March 4, 2000
Summary
Estrogen receptor-alpha (ERalpha) deficiency did not worsen stroke damage in female mice. Estrogen may protect the brain from stroke through pathways independent of ERalpha signaling.
Area of Science:
- Neuroscience
- Endocrinology
- Stroke Research
Background:
- Estrogen and hormone replacement therapy show neuroprotective effects in experimental stroke models.
- Potential mechanisms include enhanced vasodilation and direct neuronal preservation.
Purpose of the Study:
- To investigate the role of estrogen receptor-alpha (ERalpha) in mediating estrogen's neuroprotective effects during ischemic stroke.
- To determine if ERalpha-deficient (ERalphaKO) female mice exhibit increased cerebral infarction after middle cerebral artery occlusion.
Main Methods:
- Middle cerebral artery occlusion model in ERalphaKO and wild-type (WT) female mice.
- Histopathological evaluation of infarct volume using cresyl violet staining.
- Cerebral blood flow mapping via [(14)C]iodoantipyrine autoradiography.
Main Results:
- ERalpha deficiency did not alter total hemispheric brain damage in female mice.
- Cortical infarction was paradoxically smaller in ERalphaKO mice compared to WT.
- Increased parietal cortex blood flow in ERalphaKO mice may explain reduced cortical damage.
Conclusions:
- Loss of ERalpha does not exacerbate ischemic brain injury in female mice.
- Estrogen's stroke-protective mechanisms may not rely on ERalpha activation.
- Estrogen may inhibit brain injury via ERalpha-independent pathways.