Effects of acute systemic administration of serotonin2A/C receptor ligands in a delay-based decision-making task in rats.
Serotonin (5-hydoxytryptamine; 5-HT) has been implicated in the regulation of impulsivity, and high levels of impulsive behavior are associated with certain neuropsychiatric disorders. An important aspect of impulsive behavior is the inability to tolerate delays in reward. This study investigated the effects of the 5-HT(2A/C) receptor agonist DOI [(+/-)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropan hydrochloride] and the 5-HT(2A) receptor antagonist ketanserin on impulsive behavior measured in a delay-based decision-making task. Male Wistar rats were trained in a T-maze to choose a large but 10-s delayed food reward instead of a small immediate reward. After stable baseline performance (70% choice of large reward), the effects of acute systemic administration of 5-HT(2A/C) receptor ligands on waiting capacity were tested. Systemic administration of DOI (0.1, 0.3, and 0.5 mg/kg) impaired waiting capacity in a dose-dependent manner, whereas ketanserin had no effect. When combined with ketanserin, DOI did not impair waiting capacity. The data indicate that DOI-induced impairment of the ability to discount a delay in reward in a T-maze is probably regulated by 5-HT(2A) receptors. Furthermore, this study extends the existing findings of 5-HT2 receptor involvement in different tasks of delay aversion in rodents.
Hadamitzky
Martin
M
Department of Neuropharmacology, Brain Research Institute, Center for Cognitive Sciences, University of Bremen, Bremen, Germany. hadamitz@uni-bremen.de
Feja
Malte
M
Becker
Thorsten
T
Koch
Michael
M
D000662:Amphetamines / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D003657:Decision Making / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D007650:Ketanserin / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D018782:Maze Learning / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D011930:Reaction Time / Q000187:drug effects; D044402:Receptor, Serotonin, 5-HT2A / Q000378:metabolism*; D044405:Receptor, Serotonin, 5-HT2C / Q000378:metabolism*; D012055:Reinforcement Schedule; D012201:Reward; D058826:Serotonin 5-HT2 Receptor Agonists; D058830:Serotonin 5-HT2 Receptor Antagonists; D018490:Serotonin Agents / Q000008:administration & dosage / Q000494:pharmacology*
D000662:Amphetamines; D044402:Receptor, Serotonin, 5-HT2A; D044405:Receptor, Serotonin, 5-HT2C; D058826:Serotonin 5-HT2 Receptor Agonists; D058830:Serotonin 5-HT2 Receptor Antagonists; D018490:Serotonin Agents; D007650:Ketanserin; C015952:4-iodo-2,5-dimethoxyphenylisopropylamine