Mechanism of toxicity of MPTP: A cause of Parkinsonism in human beings
1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) was found in 1983 to cause a syndrome virtually identical to Parkinson's Disease in humans and other primates. The symptoms, as in idiopathic Parkinson's syndrome, are due to destruction of dopaminergic neurons in the pars compacta of the substantia nigra resulting in depletion of dopamine in the basal ganglia. The mechanism of toxicity was investigated with a dopamine containing cell line, PC12, a MPTP resistant variant (MPTP{sup r}), and synaptosomes from the striate cortex of mice, rats, guinea pigs and a monkey. The mechanism of acute effects was studied with membrane preparations from human and rat striate cortex. MPTP displaced ({sup 3}H)haloperidol from binding sites in human and rat striate cortex, but could not displace ({sup 3}H)flupenthixol, suggesting that MPTP is a D2 receptor ligand of equivalent potency in both species. MPTP was a competitive inhibitor of uptake of ({sup 3}H)dopamine in PC12 but did not accumulate in PC12 or in synaptosomes of rat, guinea pig, mouse or monkey striate cortex. 100 uM MPTP depleted catecholamine levels in PC12 cells by about 50%, without killing.
- Research Organization:
- California Univ., Los Angeles, CA (USA)
- OSTI ID:
- 5601152
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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550901* - Pathology- Tracer Techniques