title: Ethanol conditioned place preference and alterations in ΔFosB following adolescent nicotine administration differ in rats exhibiting high or low behavioral reactivity to a novel environment.
abstract: This study determined the effects of adolescent nicotine administration on adult alcohol preference in rats exhibiting high or low behavioral reactivity to a novel environment, and ascertained whether nicotine altered ΔFosB in the ventral striatum (vStr) and prefrontal cortex (PFC) immediately after drug administration or after rats matured to adulthood. Animals were characterized as exhibiting high (HLA) or low (LLA) locomotor activity in the novel open field on postnatal day (PND) 31 and received injections of saline (0.9%) or nicotine (0.56 mg free base/kg) from PND 35 to 42. Ethanol-induced conditioned place preference (CPP) was assessed on PND 68 following 8 days conditioning in a biased paradigm; ΔFosB was measured on PND 43 or PND 68. Following adolescent nicotine exposure, HLA animals demonstrated a CPP when conditioned with ethanol; LLA animals were unaffected. Further, adolescent nicotine exposure for 8 days increased levels of ΔFosB in limbic regions in both HLA and LLA rats, but this increase persisted into adulthood only in LLA animals. Results indicate that adolescent nicotine exposure facilitates the establishment of an ethanol CPP in HLA rats, and that sustained elevations in ΔFosB are not necessary or sufficient for the establishment of an ethanol CPP in adulthood. These studies underscore the importance of assessing behavioral phenotype when determining the behavioral and cellular effects of adolescent nicotine exposure.
authors.affiliation: Department of Psychiatry and Behavioral Neurosciences, University of South Florida Morsani College of Medicine, Tampa, FL, USA. Electronic address: rphilpot@health.usf.edu.
authors.forename: Rex M
authors.initials: RM
authors.lastname: Philpot
authors.affiliation: Department of Psychiatry and Behavioral Neurosciences, University of South Florida Morsani College of Medicine, Tampa, FL, USA.
authors.forename: Melanie E
authors.initials: ME
authors.lastname: Engberg
authors.affiliation: Department of Psychiatry and Behavioral Neurosciences, University of South Florida Morsani College of Medicine, Tampa, FL, USA.
authors.forename: Lynn
authors.initials: L
authors.lastname: Wecker
mesh_terms: D000367:Age Factors; D000818:Animals; D001479:Basal Ganglia / Q000187:drug effects / Q000378:metabolism; D003213:Conditioning, Psychological / Q000187:drug effects*; D004777:Environment; D000431:Ethanol / Q000008:administration & dosage*; D005260:Female; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D009538:Nicotine / Q000008:administration & dosage*; D018722:Nicotinic Agonists / Q000008:administration & dosage*; D017397:Prefrontal Cortex / Q000187:drug effects / Q000378:metabolism; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism*; D051381:Rats
chemical_list: C483820:Fosb protein, rat; D018722:Nicotinic Agonists; D016760:Proto-Oncogene Proteins c-fos; D000431:Ethanol; D009538:Nicotine
keywords: Addiction; Adolescent; Ethanol; Nicotine; Reward; ΔFosB