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Factors underlying prefrontal and insula structural alterations in smokers
Xiaochu Zhang1, Betty Jo Salmeron, Thomas J Ross
1Neuroimaging Research Branch, Intramural Research Program, National Institute on Drug Abuse, NIH, Baltimore, MD 21224, USA.
Neuroimage
|August 12, 2010
Summary
Chronic smoking damages gray matter in the prefrontal cortex and alters white matter integrity. Nicotine dependence severity and personality traits are linked to these brain changes in smokers.
Area of Science:
- Neuroscience
- Addiction Research
- Neuroimaging
Background:
- Previous studies indicate smoking affects white matter integrity and gray matter density.
- Understanding these structural brain changes is crucial for addiction research.
Purpose of the Study:
- To examine white matter integrity and gray matter density in smokers versus non-smokers.
- To investigate the impact of smoking duration (pack-years) and nicotine dependence severity (FTND, TAS-20) on brain structure.
Main Methods:
- Compared brain imaging (fractional anisotropy for white matter, voxel-based morphometry for gray matter) in 48 smokers and 48 controls.
- Subdivided smokers by dependence levels and pack-years.
- Correlated brain measures with smoking variables and personality traits (TAS-20).
Main Results:
- High pack-year smokers showed reduced gray matter density in the left prefrontal cortex (PFC), inversely related to pack-years.
- Smokers had higher gray matter density in the left insular cortex, linked to TAS-20 scores.
- Higher nicotine dependence (FTND) correlated with lower prefrontal white matter integrity (FA).
Conclusions:
- Chronic tobacco use is associated with prefrontal gray matter damage.
- Differences in insular gray matter and prefrontal white matter may reflect stable, heritable traits in smokers.
- Brain structural changes are linked to smoking severity and dependence.
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