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Cigarette Smoke Exposure in Mice using a Whole-Body Inhalation System
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Cigarette smoking and white matter microstructure.

Matthew Hudkins1, Joseph O'Neill, Marc C Tobias

  • 1Division of Child and Adolescent Psychiatry, UCLA Semel Institute for Neurosciences and Biobehavioral Studies, 760 Westwood Plaza #58-227A, Los Angeles, CA 90024-1759, USA.

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|January 5, 2012
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Summary
This summary is machine-generated.

Cigarette smoking impacts white matter integrity differently across age groups. Adolescent smokers show higher fractional anisotropy (FA), while adult smokers may experience declines with continued use, suggesting complex changes in brain structure.

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Public Health

Background:

  • Diffusion tensor imaging (DTI) studies on smoking and white matter integrity yield inconsistent results.
  • Previous research shows varied fractional anisotropy (FA) changes in adult smokers and elevated FA in adolescent smokers.
  • Adolescent smoking shows a positive correlation between FA in the genu of the corpus callosum and smoking exposure (pack-years).

Purpose of the Study:

  • To resolve discrepancies in prior research by examining adult smokers.
  • To investigate associations between white matter integrity and clinical features of nicotine dependence and smoking exposure.
  • To analyze multiple brain regions in adults to understand smoking's impact on white matter.

Main Methods:

  • Acquired brain MRI scans (1.5 T) from 18 adult smokers and 18 age/gender-matched non-smokers.
  • Assayed fractional anisotropy (FA) and apparent diffusion coefficient (ADC) in key white matter regions: corpus callosum, prefrontal white matter, corona radiata, internal capsule, cingulum bundle, and hippocampal perforant fibers.
  • Correlated DTI measures with clinical data on nicotine dependence and smoking habits.

Main Results:

  • Smokers exhibited significantly higher FA (4.3-21.1%) compared to non-smokers in specific regions, including right prefrontal white matter, cingulum, and genu corpus callosum.
  • No significant group differences were observed in apparent diffusion coefficient (ADC).
  • FA in several brain regions showed a negative correlation with nicotine dependence severity and daily cigarette consumption.

Conclusions:

  • Findings suggest a developmental model of white matter changes in response to tobacco exposure.
  • FA appears elevated during adolescent smoking and may decrease with sustained adult smoking.
  • Earlier initiation of smoking correlates with higher FA, supporting a trajectory of changing white matter integrity over time.