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Transient Focal Cerebral Ischemia Induces Long-term Cerebral Vasculature Dysfunction in a Rodent Experimental Stroke Model

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Abstract

Constriction and dilation of large arteries of the brain regulates cerebral vascular resistance and cerebral microvascular pressure, which play key roles in regulation of cerebral circulation. We investigated the effect of ischemic stroke on vascular reactivity of the middle cerebral artery (MCA) using a rat transient focal cerebral ischemia model. Focal cerebral ischemia was induced by 1 h of MCA occlusion followed by reperfusion. MCAs were dissected from ischemic or contralateral hemisphere at 2 days or 2 weeks postreperfusion and mounted on two glass micropipettes for assessment of vascular reactivity. MCAs from the brains of sham surgeries were used as control. At 2 days postreperfusion, a significant alteration of myogenic reactivity was found in MCAs dissected from both ischemic and nonischemic hemispheres, which could still be identified at 2 weeks after reperfusion. Phenylephrine (PE) induced a remarkable vasoconstriction in MCAs from animals that underwent sham surgery. No significant alteration of vasoconstrictive response to PE was found in MCAs isolated from either ischemic or contralateral hemisphere at 2 days or 2 weeks after ischemic stroke, as compared with MCAs from sham animals. Acetylcholine (ACh) induced mild dilation in normal MCAs, which was reversed in MCAs from both ischemic and nonischemic hemispheres at 2 weeks after ischemic stroke. Sodium nitroprusside (SNP) induced vasodilation in MCAs from animals with sham operation, which was diminished in MCAs from both ischemic and nonischemic hemispheres at 2 days and 2 weeks after ischemic stroke. These results demonstrated that focal cerebral ischemia could induce long-term global cerebral vasculature dysfunction.

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Acknowledgments

This study was supported partly by the NIH grants R01NS054687 (SY), R01NS054651 (SY), and R01DK079968 (RM). JCT was a postdoctoral trainee supported by T32 AG020494.

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Authors and Affiliations

  1. Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, 3500 Camp Bowie Blvd., Fort Worth, TX, 76107, USA

    Ali Winters, Jessica C. Taylor, Ming Ren, Ran Liu & Shao-Hua Yang

  2. Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX, 76107, USA

    Rong Ma

  3. Department of Biological Sciences, College of Osteopathic Medicine, William Carey University, Hattiesburg, MS, 39401, USA

    Jessica C. Taylor

Authors
  1. Ali Winters
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  2. Jessica C. Taylor
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  3. Ming Ren
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  5. Ran Liu
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  6. Shao-Hua Yang
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Correspondence to Shao-Hua Yang.

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Winters, A., Taylor, J.C., Ren, M. et al. Transient Focal Cerebral Ischemia Induces Long-term Cerebral Vasculature Dysfunction in a Rodent Experimental Stroke Model. Transl. Stroke Res. 3, 279–285 (2012). https://doi.org/10.1007/s12975-012-0148-y

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  • DOI: https://doi.org/10.1007/s12975-012-0148-y

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