Abstract
Previous studies have demonstrated that exposure to psychostimulant drugs can produce a lasting cross-sensitization to the behavioral effects of stress. The main purpose the present study was, therefore, to determine the effects of psychostimulant cross-sensitization on the stress-induced release of adrenocorticotropic hormone (ACTH) and corticosterone (CORT). Rats were given a series of injections of d-amphetamine or vehicle in a regimen that has been shown previously to induce cross-sensitization to a stressor. After two weeks, half the animals in the drug and vehicle-treated conditions were subjected to 30 min restraint stress; the remaining animals served as non-stressed controls. Animals were then sacrificed and trunk blood was assayed for CORT and ACTH. Prior d-amphetamine had no effect upon levels of CORT and ACTH in the non-stressed animals. Following 30 min restraint stress, however, levels of both hormones were significantly higher in drug-treated animals compared to controls. A second experiment confirmed behavioral sensitization to the current schedule of d-amphetamine injections, and demonstrated neuroendocrine sensitization of ACTH and CORT to a subsequent drug challenge. The augmented release of CORT and ACTH observed in d-amphetamine-treated rats might have important implications for human disorders in which processes resembling neurochemical sensitization have been hypothesized to play an etiological role.
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Acknowledgements
This research was made possible by a grant from the Canadian Institutes of Health Research to AGP, from the National Institute on Alcohol Abuse and Alcoholism grant AA07789 to JW, and an Alberta Heritage Foundation for Medical Research Scholarship to CEH.
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Barr, A., Hofmann, C., Weinberg, J. et al. Exposure to Repeated, Intermittent d-amphetamine Induces Sensitization of HPA Axis to a Subsequent Stressor. Neuropsychopharmacol 26, 286–294 (2002). https://doi.org/10.1016/S0893-133X(01)00308-6
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DOI: https://doi.org/10.1016/S0893-133X(01)00308-6
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