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Physiology of MPTP tremor
1Department of Physiology and the Center for Neural Computation, The Hebrew University-Hadassah Medical School, Jerusalem, Israel.
Movement Disorders : Official Journal of the Movement Disorder Society
|November 25, 1998
Summary
Rhesus and vervet monkeys exhibit distinct tremors after 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine hydrochloride (MPTP) exposure, modeling Parkinson's disease variants. This suggests tremor in Parkinson's disease arises from synchronized basal ganglia neuronal oscillations.
Area of Science:
- Neuroscience
- Primate Models
- Movement Disorders
Background:
- 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine hydrochloride (MPTP) is a neurotoxin used to model Parkinson's disease (PD).
- Primate models of PD exhibit varying motor symptoms, including tremors, akin to human disease heterogeneity.
Purpose of the Study:
- To investigate the differential effects of MPTP on rhesus and vervet monkeys.
- To explore the neural mechanisms underlying tremor in MPTP-induced parkinsonism.
- To correlate primate models with human Parkinson's disease variants.
Main Methods:
- MPTP administration to rhesus and vervet monkeys.
- Electrophysiological recordings of pallidal neuron activity.
- Analysis of neuronal spiking, oscillatory activity, and cross-correlograms.
- Comparison of tremor synchronization in MPTP-treated primates and human PD patients.
Main Results:
- Both species developed parkinsonian symptoms, but with distinct tremor characteristics (high-frequency in rhesus, low-frequency in vervets).
- MPTP treatment induced oscillatory and correlated pallidal neuron activity.
- Phase shift distributions differed significantly between rhesus and vervet monkeys.
- Tremor synchronization was observed in both MPTP-treated primates and human PD patients.
Conclusions:
- Rhesus and vervet monkeys serve as distinct models for tremulous and non-tremulous human parkinsonism.
- Tremor in Parkinson's disease is likely linked to synchronous neuronal oscillations in the basal ganglia.
- Synchronized pallidal neuronal assemblies are more stable in tremulous than non-tremulous parkinsonian primates.