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12h abstinence-induced right anterior insula network pattern changes in young smokers
Yanzhi Bi1, Yajuan Zhang1, Yangding Li2
1School of Life Science and Technology, Xidian University, Xi'an, PR China; Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, PR China.
Drug and Alcohol Dependence
|May 26, 2017
Summary
Smoking abstinence increases functional connectivity in the brain's insula circuits, particularly linking the anterior insula (AI) to other regions. These changes correlate with heightened craving, offering insights into nicotine dependence.
Area of Science:
- Neuroscience
- Addiction Research
- Neuroimaging
Background:
- Nicotine dependence is strongly linked to craving, a key factor in smoking relapse.
- The insula, particularly its anterior (AI) and posterior regions, is crucial for interoceptive awareness and maintaining nicotine dependence.
- While the insula's role in craving is known, the specific neural circuit mechanisms underlying abstinence-induced craving remain unclear.
Purpose of the Study:
- To investigate the impact of short-term smoking abstinence on the resting-state functional connectivity (RSFC) of the anterior (AI) and posterior insula in young smokers.
- To explore the relationship between alterations in insula circuit connectivity during abstinence and the intensity of craving.
Main Methods:
- A within-subject design was employed with 33 young male smokers.
- Participants underwent functional magnetic resonance imaging (fMRI) during two conditions: smoking satiety and after 12 hours of smoking abstinence, in a counterbalanced order.
- Multiple regression analysis examined correlations between changes in insula RSFC and craving levels.
Main Results:
- Smoking abstinence significantly increased RSFC between the right anterior insula (AI) and the medial orbitofrontal cortex (OFC), ventromedial prefrontal cortex, and anterior cingulate cortex.
- Changes in RSFC between the right AI and the right lateral OFC during abstinence were significantly correlated with the intensity of craving experienced.
Conclusions:
- Short-term smoking abstinence alters insula circuit connectivity in young smokers.
- These findings enhance our understanding of the neural basis of abstinence-induced craving, potentially informing future interventions for smoking cessation.
