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Differentiating prenatal exposure to methamphetamine and alcohol versus alcohol and not methamphetamine using
Elizabeth R Sowell1, Alex D Leow, Susan Y Bookheimer
1Laboratory of Neuro Imaging, Department of Neurology, University of California, Los Angeles, Los Angeles, California 90095, USA. esowell@ucla.edu
Prenatal methamphetamine exposure can alter brain development in children, causing volume changes in key regions like the striatum and limbic system. These structural differences correlate with cognitive deficits, particularly in children exposed to both methamphetamine and alcohol.
Area of Science:
- Neuroscience
- Developmental Psychology
- Radiology
Background:
- Prenatal exposure to substances like methamphetamine (MA) and alcohol can impact fetal development.
- Alcohol is a known teratogen, and co-exposure with MA is common among users.
- Understanding the specific neurodevelopmental effects of MA exposure is crucial.
Purpose of the Study:
- To investigate the effects of prenatal methamphetamine exposure on local brain volumes in children.
- To compare brain volumes between children with prenatal MA exposure, combined MA and alcohol exposure, alcohol-only exposure, and unexposed controls.
- To explore the relationship between brain volume alterations and cognitive function (FSIQ).
Main Methods:
- Magnetic resonance imaging (MRI) was used to assess local brain volumes in 61 children (ages 5-15).
- Participants were categorized into four groups: prenatal MA exposure, combined MA and alcohol (MAA) exposure, alcohol-only (ALC) exposure, and unexposed controls.
- Discriminant function analyses were employed to predict group membership based on local volume and FSIQ.
Main Results:
- Both MA exposure groups showed reduced volumes in striatal, thalamic, right prefrontal, and left occipitoparietal regions compared to controls.
- Striatal volume reductions were more severe in the MAA group than the ALC group; caudate volume negatively correlated with FSIQ in the MAA group.
- Limbic structures (cingulate, IFG, temporal lobes) showed volume increases in both exposure groups, more pronounced in the MAA group.
Conclusions:
- Prenatal MA exposure, particularly with co-exposure to alcohol, significantly alters brain structure in children.
- Striatal and limbic regions appear vulnerable to prenatal MA exposure, with potential long-term cognitive consequences.
- Striatal damage severity is associated with cognitive deficits, highlighting the neurotoxic impact of prenatal MA exposure.
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