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Differential effects of iloperidone, clozapine, and haloperidol on working memory of rats in the delayed non-matching-to-position paradigm

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Abstract

Rationale

Because cognitive function, particularly working memory (WM), is severely impaired in schizophrenia, evaluation of neuroleptic medication should include investigation of possible effects on cognition. Iloperidone is a promising, novel atypical neuroleptic drug (NL), for which no cognitive data is presently available.

Objective

To investigate whether the novel atypical NL iloperidone would affect performance of rats on a WM test, using a delayed non-matching-to-position (DNMTP) paradigm, and compare its effects with those of the atypical NL clozapine and the typical NL haloperidol.

Methods

Male Lister Hooded rats trained to criterion in an operant DNMTP task (0–64 s delay intervals) were administered vehicle, iloperidone (0.03, 0.1 mg/kg, i.p.), clozapine (0.1, 0.3 mg/kg, s.c.), haloperidol (0.003, 0.01, 0.03 mg/kg, s.c.), or scopolamine (0.05 mg/kg, s.c.). Together with choice accuracy, the motor performance of the task was measured.

Results

It was found that: (1) iloperidone significantly improved choice accuracy delay-dependently while impairing task performance; (2) the atypical NL clozapine had no effect on choice accuracy and parameters related to motor function, but significantly increased the number of uncompleted trials; (3) haloperidol did not affect choice accuracy except at the longest delay with the highest dose, but in contrast to clozapine it significantly impaired task performance.

Conclusion

In accordance with their different pharmacological profiles, the three NLs iloperidone, clozapine, and haloperidol have different effects in this preclinical cognitive task. These results might provide important information for the development of NLs with beneficial effects on cognition.

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  1. Nervous System Department, Novartis Pharma Inc., 4002, Basel, Switzerland

    Angela Y. Gemperle, Kevin H. McAllister & Hans-Rudolf Olpe

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  1. Angela Y. Gemperle
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  2. Kevin H. McAllister
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  3. Hans-Rudolf Olpe
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Correspondence to Hans-Rudolf Olpe.

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Gemperle, A.Y., McAllister, K.H. & Olpe, HR. Differential effects of iloperidone, clozapine, and haloperidol on working memory of rats in the delayed non-matching-to-position paradigm. Psychopharmacology 169, 354–364 (2003). https://doi.org/10.1007/s00213-003-1459-1

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