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Responsiveness to cocaine challenge in adult rats following prenatal exposure to cocaine

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Abstract

Adult rats that were gestationally exposed to cocaine and control offspring were examined for their sensitivity to challenge doses of cocaine. Offspring were derived from Sprague-Dawley dams that had received subcutaneous injections of 40 mg/kg per 3 cc cocaine hydrochloride daily on gestational days 8–20, pair-fed dams that were injected with saline, and nontreated control dams. In order to investigate the sensitivity to challenge doses of cocaine, offspring were assessed in adulthood for locomotor activity, cocaine drug discrimination, and the time course of cocaine in brain tissue following acute cocaine challenge. Adult offspring prenatally exposed to cocaine were observed to exhibit a reduced sensitivity to the discriminative stimulus effects of cocaine as evidenced by a significant shift to the right in the dose-response curve of cocaine discrimination. No prenatal treatment effects were observed in terms of the temporal patterns of cocaine discrimination or with regard to brain levels of cocaine. In addition, baseline locomotor activity and locomotor responses to challenge doses of cocaine were comparable across the prenatal treatment groups. Thus, prenatal cocaine exposure reduced sensitivity of offspring to the discriminative stimulus properties of cocaine without altering either the distribution of cocaine to the brain or the sensitivity of the offspring to the locomotor stimulant effects of cocaine.

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Authors and Affiliations

  1. Center for Developmental Psychobiology, Department of Psychology, Binghamton University, Binghamton, New York, USA

    Charles J. Heyser, Lavanya Rajachandran, Norman E. Spear & Linda Patia Spear

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  1. Charles J. Heyser
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  2. Lavanya Rajachandran
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  3. Norman E. Spear
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  4. Linda Patia Spear
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Heyser, C.J., Rajachandran, L., Spear, N.E. et al. Responsiveness to cocaine challenge in adult rats following prenatal exposure to cocaine. Psychopharmacology 116, 45–55 (1994). https://doi.org/10.1007/BF02244870

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  • DOI: https://doi.org/10.1007/BF02244870

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