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Shape changes of the corpus callosum in abstinent methamphetamine users
Jungsu S Oh1, In Kyoon Lyoo, Young Hoon Sung
1Interdisciplinary Program in Medical and Biological Engineering, Seoul National University, 28 Yongun-dong Chongno-gu, Seoul, South Korea.
Neuroscience Letters
|May 26, 2005
Summary
Methamphetamine (MA) use alters the corpus callosum (CC) structure, specifically increasing genu curvature and decreasing posterior midbody and isthmus width. These brain changes in white matter tracts may explain clinical symptoms of MA abuse.
Area of Science:
- Neuroimaging
- Neuroscience
- Addiction Research
Background:
- Methamphetamine (MA) abuse is a significant public health concern.
- Chronic MA use is associated with various neurological and psychological deficits.
- The structural integrity of the corpus callosum (CC), a crucial white matter tract, may be affected by MA use.
Purpose of the Study:
- To investigate structural alterations in the corpus callosum (CC) of individuals with a history of methamphetamine (MA) use.
- To compare the shape, size, and regional characteristics of the CC between MA users and healthy controls.
Main Methods:
- Utilized medial model-based shape analysis on CC skeletons to assess local curvature and width.
- Employed boundary model-based shape analysis to evaluate local displacement of the CC.
- Measured regional CC area sizes using Witelson's definition for comparative analysis.
Main Results:
- MA users exhibited increased curvature in the genu of the CC (4.1 degrees difference).
- Reduced width was observed in the posterior midbody (0.77 mm difference) and isthmus (0.86 mm difference) of the CC in MA users.
- Boundary model analysis revealed significant shape/width pattern displacements in MA users, correlating with medial model findings; no regional size differences were found.
Conclusions:
- Methamphetamine (MA) use is linked to regional structural changes in the corpus callosum (CC).
- These alterations in interhemispheric white matter tracts connecting frontal and parietal cortices may underlie the clinical manifestations of MA abuse.
- The findings highlight the neurotoxic effects of MA on brain structure and function.