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Dose-related effects of the acetylcholinesterase inhibitor tacrine on cocaine and food self-administration in rats

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Abstract

Rationale

Acetylcholine (ACh) is involved in brain reward and learning functions and contributes to opiate- and psychostimulant-motivated behaviors. Tacrine is a centrally acting, reversible cholinesterase inhibitor that also inhibits monoamine oxidase (MAO) and blocks reuptake of dopamine (DA) and serotonin.

Objectives

To determine the effects of pretreatment with tacrine on self-administration of cocaine and nondrug reinforcers.

Materials and methods

Male Wistar rats were trained to self-administer cocaine under a fixed-ratio-5 (FR-5) schedule during 2-h multiple-component sessions in which 0.1, 0.2, and 0.4 mg/kg per injection of cocaine were each available for 40 min. Other animals self-administered 45 mg food pellets under FR-30 or 20% Ensure (liquid food) under FR-5 in amounts of 30, 60, or 120 μl. Vehicle or tacrine was administered as single intravenous doses 20 min before self-administration of cocaine, food pellets, or liquid food.

Results

Although pretreatment with 0.032 mg/kg of tacrine increased self-administration of food pellets, pretreatment with higher doses of tacrine attenuated self-administration of cocaine, food pellets, or liquid food. Tacrine’s ED50 value for attenuating self-administration of 0.1 mg/kg per injection of cocaine was more than sixfold lower than values for attenuating liquid food- or food pellet-reinforced behavior. However, ED50 values for attenuating self-administration of higher doses of cocaine were similar to those observed for 30 or 60 μl of liquid food.

Conclusions

Tacrine can selectively attenuate self-administration of low-dose cocaine, but its effects on higher doses of cocaine are similar to its ability to decrease self-administration of nondrug reinforcers.

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Acknowledgments

Supported by a grant to KG from the Office of Research and Development, Medical Research Service, Department of Veterans Affairs. The authors would like to thank the Midwest Biomedical Research Foundation of Kansas City Missouri for administrative support. In addition, the excellent technical assistance provided by Robert Moreno is greatly appreciated.

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Correspondence to Kenneth Grasing.

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Grasing, K., He, S. & Yang, Y. Dose-related effects of the acetylcholinesterase inhibitor tacrine on cocaine and food self-administration in rats. Psychopharmacology 196, 133–142 (2008). https://doi.org/10.1007/s00213-007-0944-3

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  • DOI: https://doi.org/10.1007/s00213-007-0944-3

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