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• W2018205658 abstract "Elevated concentrations of nitric oxide (NO) and peroxynitrite (ONOO−) are present within the CNS following neurotrauma and are implicated in the pathogenesis of the accompanying neurologic deficits. We tested the hypothesis that elevated extracellular concentrations of ONOO−, introduced by the donor 3-morpholinosydnonimine (SIN-1), induce reversible axonal conduction deficits in neurons of the guinea-pig spinal cord. The compound action potential (CAP) and compound membrane potential (CMP) of excised ventral cord white matter were recorded before, during, and after, bathing the tissue (30 min) in varying concentrations (0.125–2.0 mM) of SIN-1 ( 3.75–60 μM ONOO−). The principal results were rapid onset, concentration-dependent, reductions in amplitude of the CAP (P<0.05). At a concentration of 0.25 mM of SIN-1 the reduction in CAP amplitude was fully reversible and was not accompanied by any changes in CMP. At higher concentrations of SIN-1 (≥0.5 mM) the reversibility was incomplete and there was concurrent depolarization of the CMP. These electrophysiological changes were not evident when the donor had been a priori depleted of ONOO− by uric acid or was co-administered with the ONOO− scavenger ebselen (3 mM). Immuno-fluorescence staining for nitrotyrosine (Ntyr) revealed extensive nitration of tyrosine residues in neurons exposed to higher concentrations of SIN-1. These results are the first to demonstrate that ONOO− induces reversible conduction deficits within axons of the spinal cord. The dissociation of CAP and CMP changes at low concentrations of SIN-1, when the CAP changes were reversible and there was no evidence of nitration of tyrosine residues, is consistent with ONOO−-induced alteration in Na+ channel conductance in the axolemma. The results support the view that ONOO− contributes to both reversible and non-reversible neurologic deficits following neurotrauma. The reversal of immune-mediated conduction deficits may contribute to spontaneous neurologic deficits following neurotrauma." @default.
• W2018205658 created "2016-06-24" @default.
• W2018205658 creator A5028534631 @default.
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• W2018205658 date "2008-09-01" @default.
• W2018205658 modified "2023-10-16" @default.
• W2018205658 title "The peroxynitrite donor 3-morpholinosydnonimine induces reversible changes in electrophysiological properties of neurons of the guinea-pig spinal cord" @default.
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• W2018205658 doi "https://doi.org/10.1016/j.neuroscience.2008.06.050" @default.
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