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

Roger Kurlan, Michael H. Kim, Don M. Gash

Research output: Contribution to journalArticle


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 obsevation period of up to 25 weeks. Generally, recovery leveled off after 14 weeks. Four bilaterally parkinsonian monkeys showed a 5 to 42%(mean, 22percnt;) 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.

Original languageEnglish (US)
Pages (from-to)677-679
Number of pages3
JournalAnnals of Neurology
Issue number6
Publication statusPublished - Jun 1991
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology

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