Abstract
Rationale
Intermittent treatment of rats with psychomotor stimulants induces behavioral sensitization to their motor-stimulating effects. This sensitization involves an increase in mesolimbic and nigrostriatal dopamine release, and in male rats, facilitates sexual behavior.
Objectives
The aim of this study is to investigate the effect of repeated injections of d-amphetamine on appetitive and consummatory sexual behaviors in female rats.
Materials and methods
Sexually experienced or naïve females were injected with either d-amphetamine (1 mg/kg, i.p.) or saline every other day for three injections each. After each amphetamine injection, females were placed either in a bilevel testing chamber or in their home cages. After saline injections, females were placed in bilevel chambers. Following a 3-week washout period, females were tested for sexual behavior in bilevel chambers in a drug-free state.
Results
Amphetamine pre-exposure facilitated the display of solicitations, hops and darts, and female–male mounting (FMM), regardless of whether the drug was paired with the testing environment.
Conclusion
Intermittent amphetamine pretreatment that induces behavioral sensitization facilitates appetitive sexual behaviors in female rats, as has been shown previously in male rats. This suggests that the physiological substrates that modulate sensitized responses to psychomotor stimulants also mediate sensitized appetitive responses to sexual cues, including solicitation, hops and darts, and FMM. As in male rats, this facilitation was a direct consequence of amphetamine sensitization and not due to conditioned associations between drug and test environment.
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Acknowledgements
The authors wish to thank Drs. Jill Becker, Dennis Fiorino, and Anthony Phillips for the many useful discussions. This research was supported by a Discovery grant from the Natural Sciences and Engineering Research Council of Canada (OGP-0138878) to JGP and by FRSQ (Québec) to the Center for Studies in Behavioral Neurobiology at Concordia University. Veronica A. Afonso is now at the Department of Psychology, University of Toronto at Mississauga, Mississauga, ON, Canada. Devin Mueller is now at the Department of Psychology, University of Wisconsin, Milwaukee, WI, USA. All animal procedures conformed to the guidelines of the Canadian Council on Animal Care and were approved by the Concordia University Animal Research Ethics Committee.
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Afonso, V.M., Mueller, D., Stewart, J. et al. Amphetamine pretreatment facilitates appetitive sexual behaviors in the female rat. Psychopharmacology 205, 35–43 (2009). https://doi.org/10.1007/s00213-009-1511-x
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DOI: https://doi.org/10.1007/s00213-009-1511-x