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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
PubMed

Insights

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.

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