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The Journal of Neuroscience, July 15, 1999, 19(14):5910-5918

Neuronal Nitric Oxide Synthase Activation and Peroxynitrite Formation in Ischemic Stroke Linked to Neural Damage

Mikael J. L. Eliasson1, 2, Zhihong Huang4, Robert J. Ferrante5, 6, Masao Sasamata4, Mark E. Molliver2, Solomon H. Snyder1, 2, 3, and Michael A. Moskowitz4

Departments of 1 Pharmacology and Molecular Science, 2 Neuroscience, and 3 Psychiatry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, 4 Stroke and Neurovascular Regulation Laboratory, Neurology and Neurosurgery Services Massachusetts General Hospital, Charlestown, Massachusetts 02129, 5 Departments of Neurology, Pathology, and Psychiatry, Boston University School of Medicine, Boston, Massachusetts 02118, and 6 Bedford Veterans Administration Medical Center, GRECC Unit 182B, Bedford, Massachusetts 01730

Nitric oxide (NO) is a new intercellular messenger that occurs naturally in the brain without causing overt toxicity. Yet, NO has been implicated as a mediator of cell death in cell death. One explanation is that ischemia causes overproduction of NO, allowing it to react with superoxide to form the potent oxidant peroxynitrite. To address this question, we used immunohistochemistry for citrulline, a marker for NO synthase activity, and 3-nitrotyrosine, a marker for peroxynitrite formation, in mice subjected to reversible middle cerebral artery occlusion. We show that ischemia triggers a marked augmentation in citrulline immunoreactivity but more so in the peri-infarct than the infarcted tissue. This increase is attributable to the activation of a large population (~80%) of the neuronal isoform of NO synthase (nNOS) that is catalytically inactive during basal conditions, indicating a tight regulation of physiological NO production in the brain. In contrast, 3-nitrotyrosine immunoreactivity is restricted to the infarcted tissue and is not present in the peri-infarct tissue. In nNOSDelta /Delta mice, known to be protected against ischemia, no 3-nitrotyrosine immunoreactivity is detected. Our findings provide a cellular localization for nNOS activation in association with ischemic stroke and establish that NO is not likely a direct neurotoxin, whereas its conversion to peroxynitrite is associated with cell death.

Key words: citrulline; ischemial; peroxynitrite; 3-nitrotyrosine; nitric oxide; nitric oxide synthase; peroxynitrite


Copyright © 1999 Society for Neuroscience  0270-6474/99/19145910-09$05.00/0


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