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Enlarged striatum in abstinent methamphetamine abusers: a possible compensatory response
Linda Chang1, Christine Cloak, Kari Patterson
1Department of Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu 96813, USA. LChang@hawaii.edu
Biological Psychiatry
|April 30, 2005
Summary
Methamphetamine (METH) abuse is linked to enlarged brain structures like the putamen and globus pallidus. These changes may be a compensatory response, with larger striatal volumes correlating with better cognitive performance in METH users.
Area of Science:
- Neuroimaging
- Neuroscience
- Addiction Research
Background:
- Structural brain abnormalities in methamphetamine (METH) abuse remain poorly understood.
- Investigating morphometric changes in abstinent METH users is crucial.
Purpose of the Study:
- Evaluate morphometric changes in the striatum of recently abstinent METH-dependent subjects.
- Determine the relationship between morphometric changes and cognitive performance.
- Examine sex-by-METH interactions on brain morphometry.
Main Methods:
- Structural MRI scans were acquired for 50 METH users and 50 controls.
- Quantitative morphometric analyses focused on subcortical gray matter, cerebellum, and corpus callosum.
- Neuropsychological tests assessed cognitive function in a subset of participants.
Main Results:
- METH users exhibited significantly enlarged putamen and globus pallidus.
- Female METH users showed a larger mid-posterior corpus callosum.
- Smaller striatal volumes correlated with poorer cognitive performance and higher cumulative METH use.
Conclusions:
- Enlarged striatal structures (putamen, globus pallidus) in METH users may be a compensatory mechanism to maintain cognitive function.
- These findings suggest potential glial activation and inflammation as underlying mechanisms.
- Lesser cumulative METH use and larger striatal volumes were associated with preserved cognitive performance.