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213 119 119 2 2 Mark J. Benvenga J. David Leander The Lilly Research Laboratories Eli Lilly and Company, 0510, Lilly Corporate Center 46285 Indianapolis IN Abstract The effects of olanzapine (LY 170053; 2-methyl-4-(4-methyl-1-piperazinyl)-10H-thieno(2, 3b)(1,5)benzodiazepine), a potential atypical antipsychotic, were determined in pigeons whose keypeck responding was punished. These effects were compared to the anxiolytic agents chlordiazepoxide and pentobarbital, and to other antipsychotic agents. Keypeck behavior was maintained under a multiple FR30 FR30 schedule, signalled by white and red stimulus lights, respectively. Each component of the schedule alternated every 3 min with a 30-s timeout. During the white keylight component, responding was maintained by food presentation. During the red keylight component, responding was maintained by food and simultaneously suppressed by electric shock presentation, with response rates being only about 5% of those during the white stimulus light. Olanzapine (0.01–1.0 mg/kg) increased punished responding at doses below those which had an effect on unpunished responding. Clozapine (0.01–1.0 mg/kg), ritanserin (0.1–3.0 mg/kg), and, to a lesser extent, risperidone (0.1–1.0 mg/kg) were also effective at increasing punished responding. Generally, the maximum effect seen with olanzapine was equal to that seen with ritanserin, and it exceeded that seen with clozapine. However, these effects were generally less than those seen with chlordiazepoxide and pentobarbital. Haloperidol (0.01–0.1 mg/kg) was completely without effect on punished responding, while it caused decreases in unpunished behavior. These results provide further evidence that olanzapine has a profile in behavioral tests unlike the typical antipsychotic haloperidol. Moreover, this profile is similar to clozapine, a clinically effective antipsychotic with an atypical profile.
Psychopharmacology – Springer Journals
Published: May 1, 1995
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