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Effects of environmental and pharmacological manipulations on cocaine-vs-negative reinforcer choice in male and female rats

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Abstract

Rationale

The adverse consequences of human addictive drug use could be the result of either addictive drug consumption resulting in punishment (e.g., incarceration) or failure to engage in negative-reinforced behaviors that might compete with drug-maintained behaviors (e.g., contingency management strategies that reset payment amounts for drug free urines).

Objective

The goal of the present study was to establish a discrete-trial cocaine-vs-negative reinforcer (SNR) choice procedure where rats were presented with a simplified model of this conflict: choose negative reinforcement (i.e., escape or avoid foot shock) or choose an intravenous (IV) cocaine infusion followed by an inescapable shock.

Methods

Responding was maintained in male and female rats by IV cocaine infusions (0.32–1.8 mg/kg/inf) and a SNR (0.1–0.7 mA shock) under a discrete-trial concurrent “choice” schedule during daily sessions. Following parametric reinforcer magnitude and response requirement experiments, the effects of 12 h extended access cocaine self-administration and acute diazepam (0.32–10 mg/kg, IP) pretreatment were determined on cocaine-vs-SNR choice.

Results

Negative reinforcement was chosen over all cocaine doses. Lowering shock magnitude or increasing SNR response requirement failed to promote behavioral reallocation towards cocaine. Extended access cocaine self-administration sessions resulted in high daily cocaine intakes but failed to significantly increase cocaine choice in all (19) but one rat. Acute diazepam pretreatment also did not alter choice behavior up to doses that produced behavioral depression.

Conclusions

These results suggest that SNRs may be a source of reinforcement that effectively compete with and mitigate maladaptive addictive drug-maintained behaviors in the general population.

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Acknowledgements

We appreciate the technical assistance of Michelle Arriaga during the training procedures.

Funding

Research reported in this publication was supported by the National Institute on Drug Abuse (NIDA) under award numbers T32DA007027 and R21DA053820. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIDA. The funding source had no role in the experimental design, interpretation, or decision to publish the results.

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Authors and Affiliations

Authors

Contributions

Madison Marcus: writing—original draft, writing—review and editing, methodology, software, formal analysis, investigation, data curation, and data visualization. Matthew Banks: formal analysis, writing—review and editing, visualization, conceptualization, supervision, and funding acquisition.

Corresponding author

Correspondence to Matthew L. Banks.

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Competing interests

The authors declare no competing interests.

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Supplementary information

ESM 1

Supplemental materials include additional data tables and figures. (DOCX 464 kb)

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Marcus, M.M., Banks, M.L. Effects of environmental and pharmacological manipulations on cocaine-vs-negative reinforcer choice in male and female rats. Psychopharmacology 240, 1677–1689 (2023). https://doi.org/10.1007/s00213-023-06404-9

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  • DOI: https://doi.org/10.1007/s00213-023-06404-9

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