Abstract
Rationale
The catecholamine innervation of the prefrontal cortex controls attentional focus and inhibits inappropriate behavioral responses. The mechanism of action with which norepinephrine (NE) reuptake inhibitors modulate these cognitive functions has not been fully investigated.
Objective
We investigated the effect of systemic administration of the NE reuptake blocker nortriptyline (NT) on attention and impulsivity using an auditory sustained attention task. The task was designed to assess impulsive behavior and the maintenance of attentional focus to an auditory stimulus presented at interresponse time durations (IRT) between 5 and 80 s.
Results
NT (2.0 but not 3.0 mg/kg) improved sustained attention and decreased the percentage of premature responses without changing their latency. To better understand the adrenergic component of NT action, we tested the effect of noradrenergic receptor antagonists alone or together with NT. The α2-receptor antagonist yohimbine, the α1-receptor antagonist prazosin, or the β-receptor antagonist propranolol alone did not significantly affect attentive performance or premature responses. However, the beneficial effects of NT on sustained attention and premature responses were attenuated by pretreatment with either yohimbine or propranolol. On the contrary, prazosin did not affect the NT-mediated improvement in sustained attention.
Conclusions
We conclude that sustained attention displays an inverse U-shaped dependence on NT, mediated—at least in part—by α2- and β-adrenoceptors. We speculate that low doses of NT improve performance by maximizing the phasic release of NE, while higher doses of NT would elevate tonic levels of NE, thus producing suboptimal levels of phasically released NE.
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Acknowledgments
We would like to thank Mr. Jevin Jackson for thorough review of the manuscript. This work has been funded by a BBS/UTD Research Fund grant to M.A. None of the authors have any conflict of interest related to this study.
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Roychowdhury, S., Peña-Contreras, Z., Tam, J. et al. α2- and β-adrenoceptors involvement in nortriptyline modulation of auditory sustained attention and impulsivity. Psychopharmacology 222, 237–245 (2012). https://doi.org/10.1007/s00213-012-2635-y
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DOI: https://doi.org/10.1007/s00213-012-2635-y