Journal
BIOLOGICAL PSYCHOLOGY
Volume 94, Issue 3, Pages 545-555Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.biopsycho.2013.09.008
Keywords
Depression; Smoking; Nicotine; Mood; Electroencephalography; Serotonin; Tryptophan depletion; Nicotine receptors
Funding
- Ontario Mental Health Foundation (OMHF)
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Comorbidity between depression and tobacco use may reflect self-medication of serotonergically mediated mood dysregulation, which has been associated with aberrant cortical activation and hemispheric asymmetry in patients with major depressive disorders (MDD). This randomized, double-blind study in 28 remitted MDD patients examined the moderating effects of acute nicotine and smoker vs. nonsmoker status on mood and EEG changes accompanying transient reductions in serotonin induced by acute tryptophan depletion (ATD). In smokers, who exhibited greater posterior high alpha power and increased left frontal low alpha power (signs of deactivation) compared to nonsmokers, ATD increased self-ratings of depressed mood and elevated left frontal and right parietal high alpha power (i.e. further cortical deactivation). Smokers were not affected by nicotine administration. In nonsmokers, ATD did not influence depression ratings, but it reduced vigor ratings and increased frontal and posterior theta power; both of which were blocked by acute nicotine. These findings indicate a role for nicotinic receptors in disordered mood. (C) 2013 Elsevier B.V. All rights reserved.
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