title: Sardinian alcohol-preferring rats show low 5-HT extraneuronal levels in the mPFC and no habituation in monoaminergic response to repeated ethanol consumption in the NAcS.
abstract: Sardinian ethanol-preferring (sP), non-preferring (sNP), and Wistar rats show similar dopaminergic response to vanilla sugar consumption in nucleus accumbens shell (NAcS) and medial prefrontal cortex (mPFC), and similarly learn a vanilla sugar-sustained appetitive behavior. In this study we investigated whether in satiated sP, sNP, and Wistar rats vanilla sugar would also elicit a serotonergic response in NAcS and mPFC, and whether in these areas voluntary ethanol consumption would elicit dopaminergic and/or serotoninergic responses. In the NAcS, all rats showed similar serotonin increases in response to the two meals and similar development of rapid habituation. In the mPFC, Wistar and sNP rats showed similar serotonin increases after two vanilla sugar meals, while sP rats, which had low serotonin basal levels, did not show a serotonergic response. When presented with a 10% ethanol solution, Wistar and sP rats rapidly consumed it, while sNP rats did not. In the NAcS, Wistar and sP rats presented dopamine and serotonin increases in response to ethanol. However, while Wistar rats showed habituation in their response, sP rats did not. In the mPFC, ethanol induced similar dopamine increases in Wistar and sP rats; serotonin increases were observed only in Wistar rats. In conclusion, all three lines showed increased serotonin release in response to palatable food, but they profoundly differed in their response to ethanol. In fact, only Wistar and sP rats drank ethanol, Wistar rats showed a monoaminergic response similar to that obtained after palatable food, while sP rats did not develop habituation, suggesting that they perceived ethanol as a more relevant stimulus.
authors.affiliation: Department of Neuroscience, University of Siena, 53100 Siena, Italy.
authors.forename: Maria Graziella
authors.initials: MG
authors.lastname: De Montis
authors.forename: Silvia
authors.initials: S
authors.lastname: Grappi
authors.forename: Carla
authors.initials: C
authors.lastname: Gambarana
authors.forename: Benedetta
authors.initials: B
authors.lastname: Leggio
authors.forename: Giulio
authors.initials: G
authors.lastname: Nanni
authors.forename: Simona
authors.initials: S
authors.lastname: Scheggi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Tagliamonte
mesh_terms: D000428:Alcohol Drinking / Q000503:physiopathology* / Q000523:psychology; D000704:Analysis of Variance; D000818:Animals; D001070:Appetitive Behavior / Q000187:drug effects; D001522:Behavior, Animal; D015306:Biogenic Monoamines / Q000494:pharmacology*; D002492:Central Nervous System Depressants / Q000494:pharmacology; D004298:Dopamine / Q000378:metabolism; D000431:Ethanol / Q000494:pharmacology*; D006185:Habituation, Psychophysiologic / Q000187:drug effects; D008297:Male; D017551:Microdialysis / Q000379:methods; D009714:Nucleus Accumbens / Q000033:anatomy & histology / Q000187:drug effects* / Q000502:physiology; D017397:Prefrontal Cortex / Q000033:anatomy & histology / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D017208:Rats, Wistar; D012701:Serotonin / Q000378:metabolism*
chemical_list: D015306:Biogenic Monoamines; D002492:Central Nervous System Depressants; D012701:Serotonin; D000431:Ethanol; D004298:Dopamine