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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Repeated Nicotine Strengthens Gamma Oscillations in the Prefrontal Cortex and Improves Visual Attention

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Author(s):
Bueno-Junior, Lezio S. ; Simon, Nicholas W. ; Wegener, Meredyth A. ; Moghaddam, Bita
Total Authors: 4
Document type: Journal article
Source: NEUROPSYCHOPHARMACOLOGY; v. 42, n. 8, p. 1590-1598, JUL 2017.
Web of Science Citations: 3
Abstract

Nicotine has strong addictive as well as procognitive properties. While a large body of research on nicotine continues to inform us about mechanisms related to its reinforcing effects, less is known about clinically relevant mechanisms that subserve its cognitive-enhancing properties. Understanding the latter is critical for developing optimal strategies for treating cognitive deficits. The primary brain region implicated in cognitive functions improved by nicotine is the prefrontal cortex (PFC). Here we assessed the impact of nicotine on unit activity and local field potential oscillations in the PFC of behaving rats. An acute dose of nicotine produced a predominantly inhibitory influence on population activity, a small increase in gamma oscillations, and a decrease in theta and beta oscillations. After a daily dosing regimen, a shift to excitatory-inhibitory balance in single-unit activity and stronger gamma oscillations began to emerge. This pattern of plasticity was specific to the gamma band as lower frequency oscillations were suppressed consistently across daily nicotine treatments. Gamma oscillations are associated with enhanced attentional capacity. Consistent with this mechanism, the repeat dosing regimen in a separate cohort of subjects led to improved performance in an attention task. These data suggest that procognitive effects of nicotine may involve development of enhanced gamma oscillatory activity and a shift to excitatory-inhibitory balance in PFC neural activity. In the context of the clinical use of nicotine and related agonists for treating cognitive deficits, these data suggest that daily dosing may be critical to allow for development of robust gamma oscillations. (AU)

FAPESP's process: 12/21387-8 - Multi-unit recording from the prefrontal cortex with optogenetic stimulation of the locus coeruleus: unveiling neural mechanisms under an attention task
Grantee:Lézio Soares Bueno Júnior
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor