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Preclinical assessment of an adjunctive treatment approach for cognitive impairment associated with schizophrenia using the alpha7 nicotinic acetylcholine receptor agonist WYE-103914/SEN34625

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Abstract

Rationale

α7 nicotinic acetylcholine receptor (nAChR) agonists are proposed as candidate agents for the adjunctive treatment of cognitive deficits associated with schizophrenia. Despite the pursuit of such an approach clinically, it is surprising that the preclinical profile of pro-cognitive agents in conjunction with antipsychotic drugs is currently unexplored.

Objectives

We determined if the memory-enhancing effects of the selective α7 nAChR agonist WYE-103914 were preserved in the presence of the atypical antipsychotic drug risperidone, and if the antipsychotic-like profile of risperidone was preserved in the presence of WYE-103914.

Methods

Using the rat novel object recognition (NOR) paradigm, the maintenance of memory-enhancing activity of the α7 nAChR agonist WYE-103914 in the presence of risperidone was examined. Similarly, in the standard tests of antipsychotic-like activity, apomorphine-induced climbing (AIC) in mice and conditioned avoidance responding (CAR) in rats, the preservation of antipsychotic-like activity of risperidone was evaluated in the presence of WYE-103914.

Results

WYE-103914 exhibited memory-enhancing activity in rat NOR, and this effect of WYE-103914 was retained in the presence of risperidone. In AIC, the atypical antipsychotic profile of risperidone was not significantly altered by WYE-103914. In contrast, WYE-103914 moderately potentiated the efficacy profile of risperidone in CAR, an effect that did not appear to be convincingly linked to a pharmacokinetic interaction.

Conclusions

These data underscore the value of a preclinical evaluation of the adjunctive profile of a memory-enhancing agent in combination with antipsychotics and provide further support to augmentation with α7 nAChR agonists to address the cognitive deficits associated with schizophrenia.

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Abbreviations

AChE:

Acetylcholine esterase

AIC:

Apomorphine-induced climbing

CAR:

Conditioned avoidance responding

CIAS:

Cognitive impairment associated with schizophrenia

MED:

Minimum effective dose

nAChR:

Nicotininc acetylcholine receptor

NS:

Non-significant

NOR:

Novel object recognition

SOR:

Social odor recognition

WYE-103914:

1-(6-(4-fluorophenyl)pyridin-3-yl)-3-(4-(piperidin-1-yl)butyl)urea

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Acknowledgments

The authors are very grateful for the expert technical assistance of A. Adedoyin, P. Paul, J. Graul, P. Liu, and H. Majchrowski in conducting and analyzing the pharmacokinetic studies. The authors would also like to thank Dr. Sharon Rosenzweig-Lipson for helpful discussions in preparation of the manuscript.

Conflicts of interest

All authors were employees of Wyeth (now Pfizer) or Sienabiotech at the time of these studies.

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Correspondence to John Dunlop.

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Marquis, K.L., Comery, T.A., Jow, F. et al. Preclinical assessment of an adjunctive treatment approach for cognitive impairment associated with schizophrenia using the alpha7 nicotinic acetylcholine receptor agonist WYE-103914/SEN34625. Psychopharmacology 218, 635–647 (2011). https://doi.org/10.1007/s00213-011-2357-6

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