title: Suppression of maintenance of alcohol-drinking behavior by the concurrent availability of saccharin in Sardinian alcohol-preferring (sP) rats.
abstract: In the current study, we investigated the effect of the concurrent presentation of saccharin on the maintenance of alcohol-drinking behavior in selectively bred Sardinian alcohol-preferring (sP) rats. Rats were initially given access to alcohol [10% (volume/volume) in water] and water under the home cage, two-bottle, free-choice regimen, with unlimited access for 24 h/day for eight consecutive weeks. Next, a third bottle, containing saccharin [0%, 0.01%, 0.1%, 1%, or 3% (weight/volume) in water], was concomitantly offered for an additional 10 consecutive days. Intake of saccharin solution resulted as an inverted-U function of saccharin concentration, with the 0.1% saccharin solution being the highest accepted. Alcohol intake was a U function of saccharin concentration, being reduced by 65%-95% in the group of rats exposed to the 0.1% saccharin solution. These results indicate that (1) the concurrent presentation of highly palatable solutions of saccharin markedly reduced alcohol intake in alcohol-experienced sP rats and (2) the reducing effect of saccharin solutions on the alcohol intake in sP rats was positively related to their degree of acceptability. We hypothesized that saccharin solutions may have functioned as a reinforcer, partially substituting for alcohol reinforcement and rendering alcohol drinking less urgent.
authors.affiliation: C.N.R. Institute of Neuroscience, Section of Cagliari, Italy.
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Colombo
authors.forename: Carla
authors.initials: C
authors.lastname: Lobina
authors.forename: Paola
authors.initials: P
authors.lastname: Maccioni
authors.forename: M Francesca
authors.initials: MF
authors.lastname: Mascia
authors.forename: Alessandro
authors.initials: A
authors.lastname: Orrù
authors.forename: Gian Luigi
authors.initials: GL
authors.lastname: Gessa
authors.forename: Mauro A M
authors.initials: MA
authors.lastname: Carai
mesh_terms: D000428:Alcohol Drinking / Q000235:genetics* / Q000523:psychology*; D000818:Animals; D002755:Choice Behavior; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012439:Saccharin / Q000008:administration & dosage*
chemical_list: D012439:Saccharin