title: Effects of N-(2,6-dimethylphenyl)-2-(2-oxo-1-pyrrolidinyl)acetamide (DM-9384) on learning and memory in rats.
abstract: Effects of N-(2,6-dimethylphenyl)-2-(2-oxo-1-pyrrolidinyl) acetamide (DM-9384) on learning and memory were studied using four different experimental rat models. In electroconvulsive shock- or scopolamine-induced amnesia in the step-through passive avoidance task, DM-9384 improved both types of amnesia when administered before the training trial. Aniracetam also showed similar but somewhat weaker effects. Furthermore, in the scopolamine amnesia model, an improvement was confirmed with arecoline. The dose-response curves for these compounds were bell-shaped. In the shuttle box active avoidance task, DM-9384 administered daily 1 hr before each training session facilitated the acquisition process of the avoidance response. In addition, the experiment of light-dark discrimination task with positive reinforcement showed that this compound administered daily after each session slightly accelerated the acquisition process of the correct response. These results suggest an ability of DM-9384 to enhance cognitive functions.
authors.affiliation: Research Institute, Daiichi Seiyaku Co., Ltd., Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sakurai
authors.forename: H
authors.initials: H
authors.lastname: Ojima
authors.forename: T
authors.initials: T
authors.lastname: Yamasaki
authors.forename: H
authors.initials: H
authors.lastname: Kojima
authors.forename: A
authors.initials: A
authors.lastname: Akashi
mesh_terms: D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects; D004193:Discrimination Learning / Q000187:drug effects; D004597:Electroshock; D007858:Learning / Q000187:drug effects*; D008297:Male; D008568:Memory / Q000187:drug effects*; D011619:Psychotropic Drugs / Q000494:pharmacology*; D011760:Pyrrolidinones / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D012601:Scopolamine / Q000494:pharmacology
chemical_list: D011619:Psychotropic Drugs; D011760:Pyrrolidinones; C058876:nefiracetam; C036466:aniracetam; D012601:Scopolamine