title: Adolescent and adult rat cortical protein kinase A display divergent responses to acute ethanol exposure.
abstract: Adolescent rats display reduced sensitivity to many dysphoria-related effects of alcohol (ethanol) including motor ataxia and sedative hypnosis, but the underlying neurobiological factors that contribute to these differences remain unknown. The cyclic adenosine monophosphate (cAMP)-dependent protein kinase A (PKA) pathway, particularly the type II regulatory subunit (RII), has been implicated in ethanol-induced molecular and behavioral responses in adults. Therefore, the current study examined cerebral cortical PKA in adolescent and adult ethanol responses. With the exception of early adolescence, PKA RIIα and RIIβ subunit levels largely did not differ from adult levels in either whole cell lysate or P2 synaptosomal expression. However, following acute ethanol exposure, PKA RIIβ P2 synaptosomal expression and activity were increased in adults, but not in adolescents. Behaviorally, intracerebroventricular administration of the PKA activator Sp-cAMP and inhibitor Rp-cAMP prior to ethanol administration increased adolescent sensitivity to the sedative-hypnotic effects of ethanol compared to controls. Sp-cAMP was ineffective in adults whereas Rp-cAMP suggestively reduced loss of righting reflex (LORR) with paralleled increases in blood ethanol concentrations. Overall, these data suggest that PKA activity modulates the sedative/hypnotic effects of ethanol and may potentially play a wider role in the differential ethanol responses observed between adolescents and adults.
authors.affiliation: Department of Psychology, Center for Development and Behavioral Neuroscience, Binghamton University - State University of New York, 4400 Vestal Parkway East, Binghamton, NY 13902-6000, USA; Department of Health and Human Services, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD 21224, USA.
authors.forename: Eduardo D
authors.initials: ED
authors.lastname: Gigante
authors.affiliation: Department of Psychology, Center for Development and Behavioral Neuroscience, Binghamton University - State University of New York, 4400 Vestal Parkway East, Binghamton, NY 13902-6000, USA.
authors.forename: Jessica L
authors.initials: JL
authors.lastname: Santerre
authors.affiliation: Department of Psychology, Center for Development and Behavioral Neuroscience, Binghamton University - State University of New York, 4400 Vestal Parkway East, Binghamton, NY 13902-6000, USA.
authors.forename: Jenna M
authors.initials: JM
authors.lastname: Carter
authors.affiliation: Department of Psychology, Center for Development and Behavioral Neuroscience, Binghamton University - State University of New York, 4400 Vestal Parkway East, Binghamton, NY 13902-6000, USA. Electronic address: dwerner@binghamton.edu.
authors.forename: David F
authors.initials: DF
authors.lastname: Werner
mesh_terms: D000375:Aging; D000818:Animals; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism; D054754:Cyclic AMP-Dependent Protein Kinase RIIalpha Subunit / Q000096:biosynthesis; D054757:Cyclic AMP-Dependent Protein Kinase RIIbeta Subunit / Q000378:metabolism*; D000431:Ethanol / Q000494:pharmacology*; D008297:Male; D017207:Rats, Sprague-Dawley; D013574:Synaptosomes / Q000187:drug effects / Q000378:metabolism
chemical_list: D054754:Cyclic AMP-Dependent Protein Kinase RIIalpha Subunit; D054757:Cyclic AMP-Dependent Protein Kinase RIIbeta Subunit; D000431:Ethanol
keywords: Adolescence; Ethanol; Protein kinase A; cAMP