title: The effect of L-stepholidine, a novel extract of Chinese herb, on the acquisition, expression, maintenance, and re-acquisition of morphine conditioned place preference in rats.
abstract: The effect of L-stepholidine (SPD), a novel alkaloid extract of the Chinese herb Stephania with partial dopamine D1 receptor agonistic and D2 receptor antagonistic dual actions, on morphine conditioned place preference (CPP) was studied. Daily injection of morphine (10 mg/kg, i.p.) for 6 days induced CPP in rats, and daily treatment with SPD at 10 or 20 mg/kg before morphine injection dose-dependently attenuated morphine-induced CPP. On the day following acquisition of morphine CPP, a single administration of SPD at 10 or 20 mg/kg failed to block the expression of CPP. However, daily administration of SPD at 20 mg/kg for 7 days attenuated the maintenance of CPP. Morphine-induced CPP extinguished after a 21-day saline training and then a single injection of morphine (3 mg/kg, i.p.) induced re-acquisition of morphine CPP; however, pretreatment with SPD at 10 or 20 mg/kg 30 min before morphine injection dose-dependently blocked morphine (3 mg/kg, i.p.)-induced re-acquisition of morphine CPP. Furthermore, our data indicate that SPD had no effect on food-induced CPP or state-dependent learning, suggesting that the observed effect of SPD does not result from an inhibition of general learning ability. These results demonstrate that SPD can inhibit acquisition, maintenance, and re-acquisition of morphine conditioned place preference and suggest its potential for treatment of opioid addiction.
authors.affiliation: Pharmacology Research Center, Shanghai Medical College and Institutes of Brain Science, Fudan University, 138 Yi Xue Yuan Road, Shanghai 200032, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Zhou
authors.forename: Jie
authors.initials: J
authors.lastname: Sun
authors.forename: Luanfeng
authors.initials: L
authors.lastname: Pan
authors.forename: Lin
authors.initials: L
authors.lastname: Kang
authors.forename: Zhengze
authors.initials: Z
authors.lastname: Dai
authors.forename: Rong
authors.initials: R
authors.lastname: Yu
authors.forename: Guozhang
authors.initials: G
authors.lastname: Jin
authors.forename: Lan
authors.initials: L
authors.lastname: Ma
mesh_terms: D000701:Analgesics, Opioid / Q000009:adverse effects*; D000704:Analysis of Variance; D000818:Animals; D014150:Antipsychotic Agents / Q000008:administration & dosage*; D001522:Behavior, Animal / Q000187:drug effects; D001599:Berberine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D003216:Conditioning, Operant / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004347:Drug Interactions; D005108:Extinction, Psychological / Q000187:drug effects; D008297:Male; D009020:Morphine / Q000009:adverse effects*; D009021:Morphine Dependence / Q000209:etiology / Q000517:prevention & control / Q000523:psychology; D009043:Motor Activity / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D012054:Reinforcement, Psychology
chemical_list: D000701:Analgesics, Opioid; D014150:Antipsychotic Agents; D001599:Berberine; C010513:stepholidine; D009020:Morphine