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  • Title: The time course and magnitude of spontaneous recovery of parkinsonism produced by intracarotid administration of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine to monkeys.
    Author: Kurlan R, Kim MH, Gash DM.
    Journal: Ann Neurol; 1991 Jun; 29(6):677-9. PubMed ID: 1892370.
    Abstract:
    We studied rhesus monkeys with hemiparkinsonism or bilateral parkinsonism produced by unilateral or bilateral intracarotid administration of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine. Using a standardized clinical rating scale, 4 hemiparkinsonian monkeys showed a 13 to 56% (mean, 36%) spontaneous improvement during an observation period of up to 25 weeks. Generally, recovery leveled off after 14 weeks. Four bilaterally parkinsonian monkeys showed a 5 to 42% (mean, 22%) improvement over a period of up to 30 weeks. Our findings emphasize that spontaneous recovery is a potentially confounding characteristic of this monkey model when used for assessing novel antiparkinsonian therapies.
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