Chronic cocaine administration sensitizes behavioral but not neuroendocrine responses.

Published

Journal Article

Many behavioral responses to cocaine become progressively exaggerated with chronic treatment. Most studies have focused on cocaine-induced locomotor stimulation and changes in the dopamine projection systems which mediate these actions. However, it is not clear if a uniform 'sensitization' develops in all dopamine systems during chronic stimulant administration. To test this possibility the neuroendocrine actions of cocaine which are mediated, in part, by hypothalamic dopamine neurons were evaluated after chronic cocaine administration. Treatment of rats with cocaine (15 mg/kg, 2x/day) markedly enhanced the locomotor response to cocaine after 3 and 7 days of chronic administration. In contrast, neither the stimulation of adrenocorticotropic hormone (ACTH)/corticosterone (CS) secretion nor the slight inhibition of prolactin caused by acute cocaine administration changed, although a small elevation of basal corticosterone secretion was observed after 7 days. These findings suggest that the marked sensitization observed in other dopamine systems does not occur in the hypothalamic dopamine neurons thought to mediate the neuroendocrine responses to cocaine during chronic administration, despite recently described commonalities in uptake and autoreceptor functions in these dopamine cell populations. This contrast suggests a role for long loop feedback systems unique to telencephalic dopamine systems or region-specific neurochemical adaptations in cocaine sensitization.

Full Text

Duke Authors

Cited Authors

  • Borowsky, B; Kuhn, CM

Published Date

  • March 15, 1991

Published In

Volume / Issue

  • 543 / 2

Start / End Page

  • 301 - 306

PubMed ID

  • 1647834

Pubmed Central ID

  • 1647834

International Standard Serial Number (ISSN)

  • 0006-8993

Digital Object Identifier (DOI)

  • 10.1016/0006-8993(91)90041-s

Language

  • eng

Conference Location

  • Netherlands