title: Effects of a dopamine D1 agonist on ketamine-induced spatial working memory dysfunction in common marmosets.
abstract: It is considered that functional deficiency of the NMDA receptors in the prefrontal cortex (PFC) is one of the causes of the cognitive impairment observed in schizophrenia. As non-human primates display more developed PFC than rodents, they are considered to be useful experimental animals for improving the predictive validity of models used to discover new drugs for treating cognitive dysfunction. The aim of this study was to develop a convenient model of the cognitive impairment observed in schizophrenia using common marmosets and the CANTAB system and to test whether a full agonist of the dopamine D1 receptor (SKF-81297) was effective against the cognitive impairment induced in this model. We administered the NMDA receptor antagonist ketamine (1.5-16mg/kg, i.m.) to the marmosets to induce cognitive impairment and then evaluated their working memory function using the CANTAB spatial working memory (SWM) test. The marmosets' working memory was impaired by subanesthetic doses of ketamine. Next, we tested the effect of SKF-81297 (3 or 10mg/kg, p.o.) on this ketamine-induced cognitive dysfunction. The marmosets were administered SKF-81297 30min before the ketamine injection. Pretreatment with SKF-81297 reversed the ketamine-induced cognitive deficiency. In this study, we found that a D1 receptor agonist, which has been reported to enhance cognitive function, reversed ketamine-induced cognitive impairment in marmosets, which suggests that our marmoset model could be a useful tool for predicting the clinical efficacy of cognitive-enhancing drugs.
authors.affiliation: Ikeda Lab., Drug Development Research Laboratories, Dainippon Sumitomo Pharma Co., Ltd., 33-94 Enoki-cho, Suita, Osaka 564-0053, Japan.
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Nakako
authors.forename: Takeshi
authors.initials: T
authors.lastname: Murai
authors.forename: Masaru
authors.initials: M
authors.lastname: Ikejiri
authors.forename: Takeo
authors.initials: T
authors.lastname: Ishiyama
authors.forename: Mutsuo
authors.initials: M
authors.lastname: Taiji
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Ikeda
mesh_terms: D000818:Animals; D001552:Benzazepines / Q000494:pharmacology; D002144:Callithrix; D018491:Dopamine Agonists / Q000494:pharmacology*; D007649:Ketamine; D018782:Maze Learning / Q000187:drug effects*; D008569:Memory Disorders / Q000139:chemically induced; D008570:Memory, Short-Term / Q000187:drug effects*; D017447:Receptors, Dopamine D1 / Q000819:agonists; D013037:Spatial Behavior / Q000187:drug effects*
chemical_list: D001552:Benzazepines; D018491:Dopamine Agonists; D017447:Receptors, Dopamine D1; D007649:Ketamine; C067113:SK&F 81297