The neurovascular dysfunction induced by angiotensin II in the mouse neocortex is sexually dimorphic.

The neurovascular dysfunction induced by angiotensin II in the mouse neocortex is sexually dimorphic. Research Abstract Details 

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The neurovascular dysfunction induced by angiotensin II in the mouse neocortex is sexually dimorphic. Abstract Text:

H Girouard,A Lessard,C Capone,T A Milner,C Iadecola,H Girouard,A Lessard,C Capone,T A Milner,C Iadecola,

Women are less susceptible to the cerebrovascular complications of hypertension, such as a stroke and vascular dementia. The mechanism of such protection may be related to a reduced vulnerability of women to the cerebrovascular actions of hypertension. To test this hypothesis, we used a model of hypertension based on infusion of angiotensin II (ANG II), an octapeptide that plays a key role in hypertension and produces cerebrovascular dysregulation. Cerebral blood flow (CBF) was monitored by laser-Doppler flowmetry in anesthetized (urethane-chloralose) C57BL/6J male and female mice equipped with a cranial window. ANG II administration (0.25 mug.kg(-1).min(-1) iv x 30-45 min) elevated arterial pressure equally in both sexes but attenuated the CBF increase induced by whisker stimulation or by the endothelium-dependent vasodilator acetylcholine (ACh) in male but not in female mice. The administration of ANG II for 7 days (2.74 mg.kg(-1).day(-1)), using osmotic minipumps, also attenuated these cerebrovascular responses in male, but not female, mice. The reduced susceptibility to the effect of ANG II in female mice was abolished by ovariectomy and reinstated by estrogen administration to ovariectomized mice. Administration of estrogen to male mice abolished the ANG II-induced attenuation of CBF responses. We conclude that female mice are less susceptible to the cerebrovascular dysregulation induced by ANG II, an effect related to estrogen. Such protection from the deleterious cerebrovascular effects of hypertension may play a role in the reduced vulnerability to the cerebrovascular complications of hypertension observed in women.

The neurovascular dysfunction induced by angiotensin II in the mouse neocortex is sexually dimorphic. Publishing Authors By Initials

H Girouard,A Lessard,C Capone,TA Milner,C Iadecola,H Girouard,A Lessard,C Capone,TA Milner,C Iadecola,

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The neurovascular dysfunction induced by angiotensin II in the mouse neocortex is sexually dimorphic. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: American journal of physiology. Heart and circulat

VOLUME: 294

Page Numbers: H156-63

Journal Abbreviation: Am. J. Physiol. Heart Circ. Ph

ISSN: 0363-6135

DAY: 2

MONTH: 11

YEAR: 2007

The neurovascular dysfunction induced by angiotensin II in the mouse neocortex is sexually dimorphic. Information

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LANGUAGE: eng

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AFFILIATION: Div. of Neurobiology, Weill Cornell Medical College, 411 E. 69th St., New York, NY 10021. coi2001@med.cornell.edu).

Country: United States

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MEDLINETA: Am J Physiol Heart Circ Physio

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