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Can tetrahydroisoquinoline (TIQ) or N-methyl-TIQ produce parkinsonism?

  • M. Yoshida
  • M. Ogawa
  • T. Nagatsu
Conference paper
Part of the Key Topics in Brain Research book series (KEYTOPICS)

Summary

We have examined the effect of chronic administration of a probable endogenous dopaminergic neurotoxin, tetrahydroisoquinoline (TIQ, 20mg/kg per day, s.c. for up to 104 days), on squirrel monkeys. Chronically administered TIQ produced motor symptoms similar to parkinsonism in squirrel monkeys even after 7 days’ discontinuation of TIQ and the symptoms were alleviated remarkably by levodopa treatment. Biochemical analysis of the brains of TIQ-treated monkeys revealed significant decrease in dopamine (DA) and total biopterin (BP) concentrations, and tyrosine hydroxylase (TH) activity in the substantia nigra. Morphological changes of the substantia nigra of the mice were also analysed. The effect of long-term administration of N-methyl-TIQ on aged monkeys was described.

Keywords

Tyrosine Hydroxylase Substantia Nigra Biogenic Amine Squirrel Monkey Motor Disturbance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Wien 1991

Authors and Affiliations

  • M. Yoshida
    • 1
  • M. Ogawa
    • 1
  • T. Nagatsu
    • 2
  1. 1.Department of NeurologyJichi Medical SchoolTochigikenJapan
  2. 2.Department of BiochemistryNagoya UniversityNagoyaJapan

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