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Effect of the κ opioid agonist R-84760 on cocaine-induced increases in striatal dopamine levels and cocaine-induced place preference in C57BL/6J mice

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Abstract

Rationale

While the effects of several kappa opioid receptor agonists on cocaine-induced reward have been studied, such effects of R-84760, a novel non-peptidic, potent and selective kappa opioid agonist that has been studied in humans, are not yet known.

Objective

To study the effects of R-84760 on basal levels of dopamine, cocaine-induced increases in dopamine levels, cocaine-induced conditioned place preference and locomotor activity in mice.

Methods

In the first experiment, R-84760 was administered i.p. (0, 0.01, 0.05 or 0.1 mg/kg) to C57BL/6J mice. Its effect on basal dopamine levels in the caudate putamen was measured with in vivo microdialysis. In the second experiment, the effect of pretreatment with 0.1 mg/kg R-84760 on cocaine-induced increases in dopamine levels was studied. The third experiment examined the effect of R-84760 (0.1 mg/kg) on the development of cocaine-induced conditioned place preference and locomotor activity in the conditioning chamber.

Results

R-84760 decreased dopamine levels in a dose-dependent manner. The highest dose of R-84760 (0.1 mg/kg, i.p.) significantly decreased dopamine levels relative to vehicle, an effect completely blocked by pre-injection with 10 mg/kg of the kappa-opioid receptor antagonist nor-binaltorphimine (nor-BNI). The same dose of R-84760 blocked cocaine-induced increases in dopamine levels, cocaine-induced conditioned place preference and attenuated cocaine-induced locomotor response.

Conclusion

These findings suggest that R-84760 decreases dopamine levels in the caudate putamen through kappa-opioid receptors. The inhibitory effect of R-84760 on striatal dopamine may contribute to its blockade of cocaine-induced increases in dopamine levels, cocaine-induced conditioned place preference and the associated increases in locomotor activity.

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Acknowledgements

We thank Susan Russo for her careful reading of the manuscript. This work was supported by National Institutes of Health-National Institute on Drug Abuse Research Center Grant P60-DA05130 and National Institute on Drug Abuse Research Scientist Award K05-DA00049 to Dr. Mary Jeanne Kreek.

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Correspondence to Yong Zhang.

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Zhang, Y., Butelman, E.R., Schlussman, S.D. et al. Effect of the κ opioid agonist R-84760 on cocaine-induced increases in striatal dopamine levels and cocaine-induced place preference in C57BL/6J mice. Psychopharmacology 173, 146–152 (2004). https://doi.org/10.1007/s00213-003-1716-3

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  • DOI: https://doi.org/10.1007/s00213-003-1716-3

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