Gender-linked brain injury in experimental stroke

Nabil J. Alkayed, Izumi Harukuni, Alane S. Kimes, Edythe D. London, Richard J. Traystman, Patricia D. Hurn

Research output: Contribution to journalArticle

605 Scopus citations

Abstract

Background and Purpose - Premenopausal women are at lower risk than men for stroke, but the comparative vulnerability to tissue injury once a cerebrovascular incident occurs is unknown. We hypothesized that female rats sustain less brain damage than males during experimental focal ischemia and that the gender difference in ischemic outcome can be eliminated by ovariectomy. Methods - Age-matched male (M), intact female (F), and ovariectomized female (O; plasma estradiol: 4.1±1.6 pg/mL compared with 7.4±1.5 in F and 4.0±1.1 in M) rats from two different strains, normotensive Wistar and stroke-prone spontaneously hypertensive rats, were subjected to 2 hours of intraluminal middle cerebral artery occlusion, followed by 22 hours of reperfusion. Cerebral blood flow (CBF) was monitored throughout the ischemic period by laser-Doppler flowmetry. Infarction volume in the cerebral cortex (Ctx) and caudoputamen (CP) was determined by 2,3,5- triphenyl-tetrazolium chloride staining. In a separate cohort of M, F, and O Wistar rats, absolute rates of regional CBF were measured at the end of the ischemic period by quantitative autoradiography using [14C]iodoantipyrine. Results - F rats of either strain had a smaller infarct size in Ctx and CP and a higher laser-Doppler flow during ischemia compared with respective M and O rats. Mean end-ischemic CBF was higher in F compared with M and O rats in CP, but not in Ctx. Cerebrocortical tissue volume with end-ischemic CBF <10 mL/100 g/min was smaller in F than M rats, but not different from O rats. Conclusions - We conclude that endogenous estrogen improves stroke outcome during vascular occlusion by exerting both neuroprotective and flow- preserving effects.

Original languageEnglish (US)
Pages (from-to)159-166
Number of pages8
JournalStroke
Volume29
Issue number1
DOIs
StatePublished - Jan 1998

Keywords

  • Cerebral blood flow
  • Estrogens
  • Gender
  • Neuroprotection
  • Stroke, experimental

ASJC Scopus subject areas

  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine
  • Advanced and Specialized Nursing

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  • Cite this

    Alkayed, N. J., Harukuni, I., Kimes, A. S., London, E. D., Traystman, R. J., & Hurn, P. D. (1998). Gender-linked brain injury in experimental stroke. Stroke, 29(1), 159-166. https://doi.org/10.1161/01.STR.29.1.159