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- W2008805260 abstract "The effects of rolipram, a selective inhibitor of phosphodiesterase 4, on the hyperlocomotion induced by several abused drugs (methamphetamine, morphine and phencyclidine) and a dopamine D1-receptor agonist (SKF81297; (+/-)-6-chloro-7,8-dihydroxy-1-phenyl-2,3 ,4,5-tetrahydro-1H-3-benzazepin hydrobromide) in mice were investigated. Methamphetamine (0.5-2.0 mg/kg), morphine (5.0-20 mg/kg), phencyclidine (1.25-5.0 mg/kg) and SKF81297 (2.5-10 mg/kg) each induced dose-dependent hyperlocomotion. A low dose (1.0 mg/kg) or moderate dose (3.2 mg/kg) of rolipram suppressed methamphetamine (2.0 mg/kg)- and morphine (20 mg/kg)-induced hyperlocomotion, but not phencyclidine (5.0 mg/kg)-induced hyperlocomotion. These results suggest that cAMP in the brain is involved in methamphetamine- and morphine-induced hyperlocomotion, while the underlying mechanism(s) of phencyclidine-induced hyperlocomotion may be different from those of methamphetamine- and morphine-induced hyperlocomotion. It is well known that methamphetamine- and morphine-induced hyperlocomotion are mediated by the dopaminergic system and that interaction between postsynaptic D1- and D2-receptors may play an important role in the expression of various dopamine-mediated behaviors. In the present study, SKF81297 (10 mg/kg)-induced hyperlocomotion was significantly but not completely suppressed by the highest dose of rolipram (10 mg/kg). Therefore it is unlikely that postsynaptic D1-receptor-mediated functions are involved in the suppressive effects of rolipram on methamphetamine- and morphine-induced hyperlocomotion. These results suggest that rolipram may inhibit methamphetamine- and morphine-induced hyperlocomotion via increase cAMP levels at D2-receptors." @default.
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- W2008805260 title "Effects of Rolipram, a Selective Inhibitor of Phosphodiesterase 4, on Hyperlocomotion Induced by Several Abused Drugs in Mice." @default.
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- W2008805260 doi "https://doi.org/10.1254/jjp.83.113" @default.
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