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The Journal of Neuroscience, July 4, 2007, 27(27):7083-7093; doi:10.1523/JNEUROSCI.1645-07.2007

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Neurobiology of Disease
Neurovascular Protection by Ischemic Tolerance: Role of Nitric Oxide and Reactive Oxygen Species

Alexander Kunz, ^* Laibaik Park, ^* Takato Abe, Eduardo F. Gallo, Josef Anrather, Ping Zhou, and Costantino Iadecola

Division of Neurobiology, Weill-Cornell Medical College, KB-410, New York, New York 10021

Correspondence should be addressed to Dr. Costantino Iadecola, Division of Neurobiology, Weill-Cornell Medical College, 411 East 69th Street, KB-410, New York, NY 10021. Email: coi2001{at}med.cornell.edu

Cerebral ischemic preconditioning or tolerance is a powerful neuroprotective phenomenon by which a sublethal injurious stimulus renders the brain resistant to a subsequent damaging ischemic insult. We used lipopolysaccharide (LPS) as a preconditioning stimulus in a mouse model of middle cerebral artery occlusion (MCAO) to examine whether improvements in cerebrovascular function contribute to the protective effect. Administration of LPS 24 h before MCAO reduced the infarct by 68% and improved ischemic cerebral blood flow (CBF) by 114% in brain areas spared from infarction. In addition, LPS prevented the dysfunction in cerebrovascular regulation induced by MCAO, as demonstrated by normalization of the increase in CBF produced by neural activity, hypercapnia, or by the endothelium-dependent vasodilator acetylcholine. These beneficial effects of LPS were not observed in mice lacking inducible nitric oxide synthase (iNOS) or the nox2 subunit of the superoxide-producing enzyme NADPH oxidase. LPS increased reactive oxygen species and the peroxynitrite marker 3-nitrotyrosine in wild-type mice but not in nox2 nulls. The peroxynitrite decomposition catalyst 5,10,15, 20-tetrakis(4-sulfonatophenyl)porphyrinato iron (III) attenuated LPS-induced nitration and counteracted the beneficial effects of LPS on infarct volume, ischemic CBF, and vascular reactivity. Thus, LPS preserves neurovascular function and ameliorates CBF in regions of the ischemic territory at risk for infarction. This effect is mediated by peroxynitrite formed from iNOS-derived NO and nox2-derived superoxide. The data indicate that preservation of cerebrovascular function is an essential component of ischemic tolerance and suggest that combining neuroprotection and vasoprotection may be a valuable strategy for treating ischemic brain injury.

Key words: peroxynitrite; mice; ischemic preconditioning; hydroethidine; 3-nitrotyrosine; NADPH oxidase; focal cerebral ischemia; cranial window

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Received April 12, 2007; revised May 12, 2007; accepted May 18, 2007.

Correspondence should be addressed to Dr. Costantino Iadecola, Division of Neurobiology, Weill-Cornell Medical College, 411 East 69th Street, KB-410, New York, NY 10021. Email: coi2001{at}med.cornell.edu

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