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Positron emission tomography in manganese intoxication.
E C Wolters1, C C Huang, C Clark
1Belzberg Laboratory of Clinical Neuroscience, UBC Health Sciences Centre Hospital, Vancouver, Canada.
Annals of Neurology
|November 1, 1989
Summary
Mild parkinsonism from manganese exposure did not show nigrostriatal dopaminergic damage on 6-fluorodopa scans. This suggests damage may occur postsynaptically in early manganism.
Area of Science:
- Neuroscience
- Toxicology
- Radiochemistry
Background:
- Manganese exposure can cause parkinsonism.
- The nigrostriatal dopaminergic pathway is crucial for motor control.
- Positron emission tomography (PET) is used to assess neurochemical integrity.
Purpose of the Study:
- To investigate the integrity of the nigrostriatal dopaminergic projection in individuals with manganese-induced parkinsonism.
- To explore potential sites of neurodegeneration in early manganism.
Main Methods:
- Utilized 6-fluorodopa (a PET tracer) to assess dopaminergic function.
- Scanned four subjects with clinical features of mild parkinsonism due to manganese exposure.
- Administered fluorodeoxyglucose (FDG) PET scans to evaluate cortical glucose metabolism.
Main Results:
- 6-fluorodopa PET scans in subjects with manganese-induced parkinsonism were normal.
- Decreased cortical glucose metabolism was observed on fluorodeoxyglucose scans.
- Findings suggest intact presynaptic nigrostriatal dopaminergic function.
Conclusions:
- Early parkinsonism from manganese exposure may involve postsynaptic damage, potentially in striatal or pallidal neurons.
- Cortical hypometabolism might contribute to the observed motor deficits.
- Further research is needed to elucidate the precise mechanisms of neurodegeneration in manganism.