Abstract Title:

Progesterone attenuates cocaine-induced conditioned place preference in female rats.

Abstract Source:

J Affect Disord. 2007 Apr;99(1-3):237-40. Epub 2006 Sep 27. PMID: 18067879

Abstract Author(s):

Scott J Russo, Wei Lun Sun, Ana Christina E Minerly, Karen Weierstall, Arbi Nazarian, Eugene D Festa, Tipyamol Niyomchai, Alaleh Akhavan, Victoria Luine, Shirzad Jenab, Vanya Quiñones-Jenab

Abstract:

Full Citation: Progesterone replacement attenuates the intensity of cocaine-induced conditioned place preference (CPP) behaviors in female rats. The present study aimed to expand that finding by (i) determining the role of progesterone in the acquisition and/or expression of cocaine-induced CPP and (ii) determining if progesterone's effects might be meditated through learning and memory. To this end, female rats were administered progesterone during cocaine conditioning or object recognition tasks; rats received subcutaneous injections of progesterone (500 microg) or vehicle (sesame oil) 4 h before saline or cocaine (5 mg/kg) on conditioning days (acquisition phase) or before testing (expression phase or object recognition tasks). Progesterone treatment during both the acquisition and the expression phases of cocaine conditioning blocked cocaine-induced CPP. Progesterone affected neither the number of entrances and explorations in the CPP chambers nor the ambulatory and rearing behaviors. In the object recognition task (a non-spatial learning and memory task), progesterone treatment had no effect. However, in the object placement task (a spatial learning and memory task), progesterone treatment significantly impaired retention in hormone-treated rats as compared with control groups. These results suggest that progesterone treatment interferes with cocaine-induced reward associations, possibly through effects on spatial working memory consolidation The observed effects of acute progesterone treatment on cocaine-induced CPP may in part contribute reported menstrual effects and sex disparities in overall cocaine use and rates of relapse."

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