Aberrations in Incentive Learning and Responding to Heroin in Male Rats After Adolescent or Adult Chronic Binge-Like Alcohol Exposure
| Autor: | Ewa Galaj, Eddy D. Barrera, Debra Morris, Yao-Ying Ma, Robert Ranaldi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Male
Narcotics 030508 substance abuse Medicine (miscellaneous) Binge drinking Physiology Stimulus (physiology) Alcohol exposure Toxicology Choice Behavior Article Heroin Binge Drinking 03 medical and health sciences 0302 clinical medicine Reward Male rats medicine Animals Learning Young adult Motivation Behavior Animal Ethanol business.industry Central Nervous System Depressants Rats Psychiatry and Mental health Incentive Opioid 0305 other medical science business 030217 neurology & neurosurgery Locomotion medicine.drug |
| Zdroj: | Alcohol Clin Exp Res |
| ISSN: | 1530-0277 |
| Popis: | BACKGROUND AND PURPOSE: Binge drinking is a serious problem among adolescents and young adults despite its adverse consequences on the brain and behavior. One area that remains poorly understood concerns the impact of chronic intermittent ethanol (CIE) exposure on incentive learning. METHODS: Here we examined the effects of CIE exposure during different developmental stages on conditioned approach and conditioned reward learning in rats experiencing acute or protracted withdrawal from alcohol. Two or 21 days after adolescent or adult CIE exposure, male rats were exposed to pairings of a light stimulus (CS) and food pellets for 3 consecutive daily sessions (30 CS-food pellet pairings per session). This was followed by conditioned approach testing measuring responses (food trough head entries) to the CS-only presentations and by conditioned reward testing measuring responses on a lever producing the CS and on another producing a tone. We then measured behavioral sensitization to repeated injections of heroin (2 mg/kg/day for 9 days). RESULTS: Adolescent and adult alcohol-treated rats showed significantly impaired conditioned reward learning regardless of withdrawal period (acute or prolonged). We found no evidence of changes to conditioned approach learning after adolescent or adult exposure to CIE. Finally, in addition to producing long-term impairments in incentive learning, CIE exposure enhanced locomotor activity in response to heroin and had no effect on behavioral sensitization to heroin regardless of age and withdrawal period. CONCLUSIONS: Our work sets a framework for identifying CIE -induced alterations in incentive learning and inducing susceptibility to subsequent opioid effects. |
| Databáze: | OpenAIRE |
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