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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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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DOI: https://doi.org/10.1007/s00213-011-2357-6