Wide therapeutic time window for nimesulide neuroprotection in a model of transient focal cerebral ischemia in the rat

Candelario-Jalil, Eduardo and González-Falcón, Armando and García-Cabrera, Michel and León, Olga S. and Fiebich, Bernd L. (2004) Wide therapeutic time window for nimesulide neuroprotection in a model of transient focal cerebral ischemia in the rat. [Journal (Paginated)]

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Results from several studies indicate that cyclooxygenase-2 (COX-2) is involved ischemic brain injury. The purpose of this study was to evaluate the neuroprotective effects of the selective COX-2 inhibitor nimesulide on cerebral infarction and neurological deficits in a standardized model of transient focal cerebral ischemia in rats. Three doses of nimesulide (3, 6 and 12 mg/kg; i.p.) or vehicle were administered immediately after stroke and additional doses were given at 6, 12, 24, 36 and 48 h after ischemia. In other set of experiments, the effect of nimesulide was studied in a situation in which its first administration was delayed for 3 to 24 h after ischemia. Total, cortical and subcortical infarct volumes and functional outcome (assessed by neurological deficit score and rotarod performance) were determined 3 days after ischemia. The effect of nimesulide on prostaglandin E2 (PGE2) levels in the injured brain was also investigated. Nimesulide dose-dependently reduced infarct volume and improved functional recovery when compared to vehicle. Of interest is the finding that neuroprotection conferred by nimesulide (reduction of infarct size and neurological deficits and improvement of rotarod performance) was also observed when treatment was delayed until 24 h after ischemia. Further, administration of nimesulide in a delayed treatment paradigm completely abolished PGE2 accumulation in the postischemic brain, suggesting that COX-2 inhibition is a promising therapeutic strategy for cerebral ischemia to target the late-occurring inflammatory events which amplify initial damage.

Item Type:Journal (Paginated)
Keywords:cerebral ischemia; nimesulide; cyclooxygenase-2; functional outcome; stroke; neuroprotection
Subjects:Neuroscience > Neurochemistry
ID Code:5617
Deposited By:Candelario-Jalil, Dr Eduardo
Deposited On:28 Jul 2007
Last Modified:11 Mar 2011 08:56

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