title: Parameters of Context-Induced Ethanol (EtOH)-Seeking in Alcohol-Preferring (P) Rats: Temporal Analysis, Effects of Repeated Deprivation, and EtOH Priming Injections.
abstract: Drug-paired environments can act as stimuli that elicit drug craving. In humans, drug craving is influenced by the amount of time abstinent, number of past periods of abstinence, and inadvertent exposure to the previously abused drug. The current experiments were designed to determine the effects of (i) the duration of abstinence on expression of ethanol (EtOH)-seeking; (ii) EtOH priming following a short and long abstinence period; and (iii) repeated deprivation cycles on relapse drinking and EtOH-seeking.
  
  
  
  Rats were allowed to self-administer 15% EtOH, processed through extinction training, maintained in a home cage for a designated EtOH-free period, and then reintroduced to the operant context in the absence of EtOH. The experiments examined the effects of: (i) various home-cage duration periods (1 to 8 weeks), (ii) priming injections of EtOH in the Pavlovian spontaneous recovery (PSR; 14 days after extinction) and reinstatement of responding (RoR; 1 day after extinction) models, and (iii) exposure to repeated cycles of EtOH access-deprivation on relapse drinking and EtOH-seeking behavior.
  
  
  
  Highest expression of EtOH-seeking was observed following 6 weeks of home-cage maintenance. Priming injections of EtOH were more efficacious at stimulating/enhancing EtOH-seeking in the PSR than RoR model. Exposure to repeated cycles of EtOH deprivation and access enhanced and prolonged relapse drinking and the expression of EtOH-seeking (318 ± 22 responses), which was not observed in rats given equivalent consistent exposure to EtOH (66 ± 11 responses).
  
  
  
  Overall, the data indicated that the PSR model has ecological validity; factors that enhance EtOH craving in humans enhance the expression of EtOH-seeking in the PSR test. The data also detail factors that need to be examined to determine the biological basis of EtOH-seeking (e.g., neuroadaptations that occur during the incubation period and following repeated cycles of EtOH drinking and abstinence).
authors.affiliation: Department of Psychiatry, Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, Indiana. shhauser@iupui.edu.
authors.forename: Sheketha R
authors.initials: SR
authors.lastname: Hauser
authors.affiliation: Department of Psychiatry, Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, Indiana.
authors.forename: Gerald A
authors.initials: GA
authors.lastname: Deehan
authors.affiliation: Department of Psychiatry, Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, Indiana.
authors.forename: Christopher P
authors.initials: CP
authors.lastname: Knight
authors.affiliation: Department of Psychiatry, Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, Indiana.
authors.forename: Jamie E
authors.initials: JE
authors.lastname: Toalston
authors.affiliation: Department of Psychiatry, Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, Indiana.
authors.forename: William J
authors.initials: WJ
authors.lastname: McBride
authors.affiliation: Department of Psychiatry, Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, Indiana.
authors.forename: Zachary A
authors.initials: ZA
authors.lastname: Rodd
mesh_terms: D064829:Alcohol Abstinence / Q000523:psychology*; D000428:Alcohol Drinking / Q000523:psychology*; D000818:Animals; D016739:Behavior, Addictive / Q000523:psychology*; D004305:Dose-Response Relationship, Drug; D058999:Drug-Seeking Behavior / Q000187:drug effects; D005108:Extinction, Psychological; D008297:Male; D051381:Rats; D060865:Repetition Priming; D012646:Self Administration; D013997:Time Factors
keywords: Alcohol Relapse; Alcohol-Preferring (P) Rats; Alcohol-Seeking Behavior; Repeated Alcohol Deprivations