Effects of Papaver rhoeas extract on the acquisition and expression of morphine-induced conditioned place preference in mice
2006
Sahraei, H. | Fatemi, S.M. | Pashaei-Rad, S. | Faghih-Monzavi, Z. | Salimi, S.H. | Kamalinegad, M.
In the present study, the effects of water-alcohol extract of Papaver rhoeas on the acquisition and expression of morphine-induced conditioned place preference (CPP) in mice were investigated. Subcutaneous (s.c.) administration of morphine (1, 10 and 20 mg/kg) produced place preference. On the other hand, intraperitoneal (i.p.) administration of the plant extract (25, 50 and 100 mg/kg) did not show any effect. Injection of extract (25, 50 and 100 mg/kg, i.p.) 30 min before the morphine administration decreased the acquisition of morphine CPP. Administration of the plant extract (25, 50 and 100 mg/kg, i.p.) 30 min before the test did not change the expression of morphine-induced CPP. It could be concluded that Papaver rhoeas reduced the acquisition but not the expression of morphine-induced conditioned place preference.
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