Cannabinoid receptor-1 signaling contributions to sign-tracking and conditioned reinforcement in rats
| Autor: | Joseph F. Cheer, Donna J. Calu, Hannah M. Dantrassy, Natalie E. Zlebnik, Daniel E. Kochli, Utsav Gyawali, Sam Z. Bacharach, Helen M. Nasser |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Male business.product_category Cannabinoid receptor medicine.medical_treatment Conditioning Classical Article Rats Sprague-Dawley 03 medical and health sciences 0302 clinical medicine Rimonabant Receptor Cannabinoid CB1 Medicine Inverse agonist Animals Reinforcement Pharmacology Lever business.industry Dopaminergic digestive oral and skin physiology Feeding Behavior Endocannabinoid system Rats 030104 developmental biology Cannabinoid Cues business Neuroscience Reinforcement Psychology 030217 neurology & neurosurgery psychological phenomena and processes medicine.drug Signal Transduction |
| Zdroj: | Psychopharmacology. 235(10) |
| ISSN: | 1432-2072 |
| Popis: | RATIONALE: Endocannabinoids (eCBs) are critical gatekeepers of dopaminergic signaling and disrupting cannabinoid receptor-1 (CB1) signaling alters DA dynamics to attenuate cue-motivated behaviors. Prior studies suggest that dopamine (DA) release plays a critical role in driving sign-tracking. OBJECTIVES: Here, we determine whether systemic injections of rimonabant, a CB1 receptor inverse agonist, during Pavlovian lever autoshaping impairs the expression of sign-tracking. We next examine whether rimonabant blocks the reinforcing properties of the Pavlovian lever cue in a conditioned reinforcement test. METHODS: In Exp. 1, we trained rats in Pavlovian lever autoshaping prior to systemic rimonabant injections (0, 1, 3 mg/kg) during early and late Pavlovian lever autoshaping sessions. In Exp. 2, we trained rats in Pavlovian lever autoshaping prior to systemic rimonabant injections (0,1 mg/kg) during a conditioned reinforcement test. RESULTS: Rimonabant dose-dependently decreased lever contact and probability, and increased sign-tracker’s latency to approach the lever cue early in Pavlovian training. With extended training, many previously goal-tracking and intermediate rats shifted to lever approach, which remained dose-dependently sensitive to rimonabant. Rimonabant attenuated cue-evoked food cup approach early, but not late, in conditioning, and did not affect pellet retrieval or consumption. The inserted lever cue served as a robust conditioned reinforcer after Pavlovian lever autoshaping, and 1 mg/kg rimonabant blocked conditioned reinforcement. CONCLUSIONS: Together, our results suggest that CB1 signaling mediates two critical properties of incentive stimuli; their ability to attract (Exp. 1) and their ability to reinforce (Exp. 2) behavior. |
| Databáze: | OpenAIRE |
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