Blunted opiate modulation of hypothalamic-pituitary-adrenocortical activity in men and women who smoke

Mustafa N al'Absi, Lorentz E. Wittmers, Dorothy K Hatsukami, Ruth E Westra

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Objective: To examine the extent to which nicotine dependence alters endogenous opioid regulation of the hypothalamic-pituitaryadrenocortical (HPA) axis functions. Endogenous opiates play an important role in regulating mood, pain, and drug reward. They also regulate the HPA functions. Previous work has demonstrated an abnormal HPA response to psychological stress among dependent smokers. Methods: Smokers and nonsmokers (total n = 48 participants) completed two sessions during which a placebo or 50 mg of naltrexone was administered, using a double-blind design. Blood and saliva samples, cardiovascular and mood measures were obtained during a resting absorption period, after exposure to two noxious stimuli, and during an extended recovery period. Thermal pain threshold and tolerance were assessed in both sessions. Participants also rated pain during a 90-second cold pressor test. Results: Opioid blockade increased adrenocorticotropin, plasma cortisol, and salivary cortisol levels; these increases were enhanced by exposure to the noxious stimuli. These responses were blunted in smokers relative to nonsmokers. Smokers tended to report less pain than nonsmokers, and women reported more pain during both pain procedures, although sex differences in pain were significant only among nonsmokers. Conclusions: We conclude that nicotine dependence is associated with attenuated opioid modulation of the HPA. This dysregulation may play a role in the previously observed blunted responses to stress among dependent smokers.

Original languageEnglish (US)
Pages (from-to)928-935
Number of pages8
JournalPsychosomatic medicine
Volume70
Issue number8
DOIs
StatePublished - Oct 2008

Keywords

  • Adrenocorticotropin
  • Cortisol
  • Endogenous opioids
  • Naltrexone
  • Pain
  • Smoking
  • Stress

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