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Imaging localised dynamic changes in the nucleus accumbens following nicotine withdrawal in rats

Lookup NU author(s): Dr Mohammed Shoaib


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This study utilises pharmacological functional magnetic resonance imaging (fMRI) to examine the neurobiological mechanisms through which nicotine produces dependence. Using an established regime to induce physical dependence to nicotine in rats (osmotic minipumps delivering 3.16 mg/kg/day nicotine for 7 days SC), animals were subsequently anaesthetised under urethane and positioned in a stereotaxic frame to allow collection of gradient echo whole brain images with a 4.7-T MRI spectrometer. Rats were initially scanned for 34 min (40 baseline image volumes, 1 volume per 51 s) then challenged with mecamylamine (1.0 mg/kg SC) or saline (1 ml/kg) and scanned for a further 68 min (80 image volumes). Mecamylamine precipitated highly significant positive changes in fMRI blood oxygen level dependent (BOLD) contrast that were predominantly localised to the NAc of nicotine-dependent rats. Saline-treated rats challenged with the same dose of mecamylamine exhibited similar but smaller increases in BOLD contrast although such changes were less defined around the NAc. Precipitated withdrawal also elicited statistically significant negative BOLD contrast changes in widespread cortical regions. These findings are consistent with previous neurochemical reports on decreases in dopamine in the NAc during nicotine withdrawal. This fMRI study further highlights the potential and power to image the neurobiological events during nicotine dependence. Crown Copyright © 2004 Published by Elsevier Inc. All rights reserved.

Publication metadata

Author(s): Shoaib M, Lowe AS, Williams SCR

Publication type: Article

Publication status: Published

Journal: NeuroImage

Year: 2004

Volume: 22

Issue: 2

Pages: 847-854

ISSN (print): 1053-8119

ISSN (electronic): 1095-9572

Publisher: Academic Press


DOI: 10.1016/j.neuroimage.2004.01.026

PubMed id: 15193614


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