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Role of the NMDA receptor GluN2D subunit in the expression of ketamine-induced behavioral sensitization and region-specific activation of neuronal nitric oxide synthase.
Neuroscience Letters 2016 January 2
The present study aimed to investigate the involvement of the NMDA receptor (NMDAR) and/or nitric oxide (NO) pathway in ketamine-induced behavioral sensitization. Mice received repeated subcutaneous administration of ketamine (25mg/kg), once daily or once weekly for a total of five doses. Even three administrations of ketamine, daily or weekly, induced a rapid increase in locomotor activity in wild-type (WT), but not in GluN2D knockout (GluN2D-KO) mice. Furthermore, for WT mice receiving daily ketamine, elevated locomotor activity was maintained after a 1-month withdrawal period; however, this was not the case when ketamine was administered weekly. The effect of acute ketamine on nNOS activities was estimated with nicotinamide adenine dinucleotide hydrogen phosphate-diaphorase (NADPH-d) histochemistry. Ketamine rapidly increased the number of NADPH-d activated cells and strongly stained dendrites in the dorsal striatum and prefrontal cortex of WT mice, but not GluN2D-KO mice. These results suggest that ketamine-induced locomotor sensitization and nNOS activation in the frontal cortex-striatum neuronal circuit are positively correlated and that the NMDAR GluN2D subunit plays an important role in the acquisition and maintenance of ketamine-induced behavioral sensitization.
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