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Am J Physiol Regul Integr Comp Physiol 292: R1881-R1892, 2007. First published January 18, 2007; doi:10.1152/ajpregu.00761.2005
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NEUROHUMORAL CONTROL OF CARDIOVASCULAR FUNCTION

Comparative changes in the blood-brain barrier and cerebral infarction of SHR and WKY rats

Sharon Hom,1,2 Melissa A. Fleegal,1 Richard D. Egleton,1 Christopher R. Campos,1 Brian T. Hawkins,1 and Thomas P. Davis1,2

1Department of Pharmacology and 2Program in Physiological Sciences, University of Arizona, College of Medicine, Tucson, Arizona

Submitted 27 October 2005 ; accepted in final form 10 January 2007

Hypertension is involved in the exacerbation of stroke. It is unclear how blood-brain barrier (BBB) tight-junction (TJ) and ion transporter proteins critical for maintaining brain homeostasis contribute to cerebral infarction during hypertension development. In the present study, we investigated cerebral infarct volume following permanent 4-h middle cerebral artery occlusion (MCAO) and characterized the expression of BBB TJ and ion transporter proteins in brain microvessels of spontaneously hypertensive rats (SHR) compared with age-matched Wistar-Kyoto (WKY) rats at 5 wk (prehypertension), 10 wk (early-stage hypertension), and 15 wk (later-stage hypertension) of age. Hypertensive SHR show increased infarct volume following MCAO compared with WKY control rats. BBB TJ and ion transporter proteins, known to contribute to edema and fluid volume changes in the brain, show differential protein expression patterns during hypertension development. Western blot analysis of TJ protein zonula occludens-2 (ZO-2) showed decreased expression, while ion transporter, Na+/H+ exchanger 1 (NHE-1), was markedly increased in hypertensive SHR. Expression of TJ proteins ZO-1, occludin, actin, claudin-5, and Na+-K+-2Cl– cotransporter remain unaffected in SHR compared with control. Selective inhibition of NHE-1 using dimethylamiloride significantly attenuated ischemia-induced infarct volume in hypertensive SHR following MCAO, suggesting a novel role for NHE-1 in the brain in the regulation of ischemia-induced infarct volume in SHR.

hypertension; Na+/H+ exchanger; ion transport; tight junction; middle cerebral artery occlusion


Address for reprint requests and other correspondence: T. P. Davis, Dept. of Medical Pharmacology, College of Medicine, Univ. of Arizona, 1501 N. Campbell Ave., PO Box 245050, Tucson, AZ 85724 (e-mail: davistp{at}email.arizona.edu)






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