Serotonergic/glutamatergic interactions: potentiation of phencyclidine-induced stimulus control by citalopram.
Jerrold C Winter, Justin R Eckler, K C Rice, R A Rabin
Pharmacology, biochemistry, and behavior July 2005 DOI: 10.1016/j.pbb.2005.03.022 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Observational study (drug discrimination in rats) Peer reviewed |
|---|---|
| Sample size | 12 |
| Population | Rats |
| Interventions | Citalopram PCP SDZ SER 082 SB 242084 |
| Dose | PCP: 3.0 mg/kg; citalopram dose not specified |
| Topics | Serotonin |
| Key findings | Citalopram potentiated the discriminative stimulus effects of an intermediate dose of PCP, and the 5-HT2C antagonists SDZ SER 082 and SB 242084 partially blocked this potentiation, suggesting mediation by 5-HT2C receptor agonism. |
Abstract
Previous investigations in our laboratory have found that the stimulus effects of the hallucinogenic serotonergic agonists DOM and LSD are potentiated by phencyclidine [PCP], a non-competitive NMDA antagonist. Also suggestive of behaviorally significant serotonergic/glutamatergic interactions is our finding that stimulus control by both PCP and LSD is partially antagonized by the mGlu2/3 agonist, LY 379268. These observations coupled with the fact that the stimulus effects of LSD and DOM are potentiated by selective serotonin reuptake inhibitors [SSRIs] led us in the present investigation to test the hypothesis that stimulus control by PCP is potentiated by the SSRI, citalopram. Stimulus control was established with PCP [3.0 mg/kg; 30 min pretreatment time] in a group of 12 rats. A two-lever, fixed ratio 10, positively reinforced task with saline controls was employed. Potentiation by citalopram of an intermediate dose of PCP was observed. In an attempt to establish the mechanism by which citalopram might interact with PCP, subsequent experiments examined the effects on that interaction of antagonists at serotonergic receptors. It was found that the selective 5-HT2C-selective antagonists, SDZ SER 082 and SB 242084, significantly, albeit only partially, blocked the effects of citalopram on PCP. In agreement with our previous conclusions regarding the interaction of citalopram with DOM, the present data suggest that potentiation of the stimulus effects of PCP by citalopram are mediated in part by agonist activity at 5-HT2C receptors.