Abstract
Rationale
Previous neuroimaging studies of cognition involving nicotinic acetylcholine receptor (nAChR) agonist administration have repeatedly found enhanced task-induced deactivation of regions of the default mode network (DMN), a group of brain systems that is more active at rest and mediates task-independent thought processes. This effect may be related to pro-cognitive nAChR agonist effects
Objectives
The present study sought to test whether nAChR modulation of the DMN is bi-directional, i.e., whether a nAChR antagonist would reduce task-induced deactivation.
Methods
Eighteen healthy non-smokers underwent functional magnetic resonance imaging while performing a letter N-back task. Scans were performed after nicotine administration (7 mg/24 h, transdermally), after administration of the nAChR antagonist mecamylamine (7.5 mg, p.o.), and after double placebo, in counterbalanced sequence. Blood-oxygen-level-dependent (BOLD) signal was analyzed within ventromedial prefrontal cortex (vmPFC) and posterior cingulate cortex (PCC) regions of interest—central hubs of the DMN in which consistent nAChR agonist–induced changes had previously been identified.
Results
Nicotine enhanced hit rate in both the 0-back and 2-back condition, while mecamylamine slowed reaction time in the 2-back condition. Mecamylamine reduced task-induced deactivation of vmPFC and PCC. Nicotine had no significant effects on the BOLD signal.
Conclusions
The finding that nAChR tone reduction by mecamylamine weakened task-induced DMN deactivation indicates that a constant tone of nAChR activation helps regulate DMN activity in healthy individuals. This suggests that low nAChR tone may play a causal role in DMN dysregulation seen in conditions such as mild cognitive impairment or Alzheimer’s disease.
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Funding
This work was funded by the National Institutes of Health grant R21 DA027894 to B. Hahn, and the National Institute on Drug Abuse Intramural Research Program.
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Hahn, B., Harvey, A.N., Concheiro-Guisan, M. et al. Nicotinic receptor modulation of the default mode network. Psychopharmacology 238, 589–597 (2021). https://doi.org/10.1007/s00213-020-05711-9
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DOI: https://doi.org/10.1007/s00213-020-05711-9