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Gender-linked brain injury in experimental stroke
N J Alkayed1, I Harukuni, A S Kimes
1Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Md 21287, USA.
Stroke
|January 28, 1998
Summary
Female rats show reduced brain damage from stroke compared to males, a protective effect attributed to estrogen. Ovariectomy in females eliminates this stroke protection, highlighting estrogen's role in mitigating ischemic injury.
Area of Science:
- Neuroscience
- Endocrinology
- Cardiovascular Research
Background:
- Stroke risk is lower in premenopausal women than men, but comparative tissue vulnerability is unknown.
- Investigating gender differences in brain injury severity following cerebrovascular events.
Purpose of the Study:
- To test if female rats sustain less brain damage than males during experimental focal ischemia.
- To determine if ovariectomy eliminates the gender difference in ischemic stroke outcome.
Main Methods:
- Male, intact female, and ovariectomized female rats underwent 2-hour middle cerebral artery occlusion followed by 22-hour reperfusion.
- Cerebral blood flow (CBF) monitored by laser-Doppler; infarct volume assessed by TTC staining.
- Regional CBF measured using quantitative autoradiography in a separate cohort.
Main Results:
- Female rats exhibited smaller infarct volumes and higher during-ischemia CBF compared to males and ovariectomized females.
- End-ischemic CBF was higher in females in the caudoputamen but not cerebral cortex.
- Cerebrocortical tissue volume at low CBF was smaller in females than males, but not different from ovariectomized females.
Conclusions:
- Endogenous estrogen significantly improves stroke outcome during vascular occlusion.
- Estrogen exerts both neuroprotective and cerebral blood flow-preserving effects.
- This suggests a key role for estrogen in mitigating ischemic brain injury severity.