Diazepam attenuation of restraint stress-induced corticosterone levels is enhanced by prior exposure to repeated restraint

Brian A. Kalman, Paul J. Kim, Michael A. Cole, Mu S. Chi, Robert L. Spencer

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Prior research has demonstrated that diazepam decreases hypothalamic- pituitary-adrenal cortex (HPA) axis activity in stressful contexts but, paradoxically, acts as a stimulator of basal axis activity. Also, several investigators have reported that low doses of diazepam are not effective in reducing stress-induced corticosterone (CORT) levels, yet similar doses typically produce anxiolytic effects on behavioral measures of fear and anxiety. We have examined the effects of diazepam on plasma CORT levels in male Sprague-Dawley rats utilizing a repeated restraint paradigm. Consistent with most literature, diazepam administered IP (1.5, 3.0, or 6.0 mg/kg) 1 h prior to restraint increased non-stress, baseline plasma CORT levels in a dose-dependent fashion. During the first exposure to the 1 h restraint- stress procedure, CORT levels of diazepam-injected rats did not differ from the stress levels of controls except at the 60-min stress time point in those subjects receiving 6.0 mg/kg. However, diazepam at all three doses was able to attenuate the stress-induced increase in CORT following 5 days of diazepam + restraint treatment. Using the 3.0 mg/kg dose as a probe, it was found that this effect was not dependent on the repeated administration of diazepam, but rather on repeated exposure to restraint. These results suggest that repeated restraint produces a change in neural sensitivity to benzodiazepines.

Original languageEnglish (US)
Pages (from-to)349-360
Number of pages12
JournalPsychoneuroendocrinology
Volume22
Issue number5
DOIs
StatePublished - Jul 1 1997
Externally publishedYes

Keywords

  • Corticosterone
  • Diazepam
  • HPA axis
  • Habituation
  • Rats
  • Stress

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Endocrine and Autonomic Systems
  • Psychiatry and Mental health
  • Biological Psychiatry

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