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Microtubule assembly is directly affected by MPP(+)in vitro
G Cappelletti1, B Pedrotti, M G Maggioni
1Department of Biology, University of Milan, Via Celoria 26, Milano, 20133, Italy. Graziellea.Cappelletti@unimi.it
Cell Biology International
|October 9, 2001
Summary
The neurotoxin MPP+ directly impacts microtubule assembly in vitro, suggesting a role for microtubules in Parkinsonism-inducing neurodegeneration and neuronal cell death.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Neurodegenerative diseases like Parkinsonism involve cellular targets.
- The neurotoxin N-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and its metabolite MPP+ are implicated in Parkinsonism.
- The microtubular system is a potential cellular target.
Purpose of the Study:
- To investigate the direct effect of MPP+ on microtubules.
- To determine if MPP+ or MPTP interacts with microtubule assembly.
Main Methods:
- In vitro study using purified microtubule protein from bovine brain.
- Analysis of microtubule assembly kinetics and ultrastructure.
Main Results:
- MPP+ significantly altered the initial rate and critical concentration of microtubule assembly.
- MPTP did not show any significant effect on microtubule assembly.
- Microtubule ultrastructure remained unaffected by MPP+.
Conclusions:
- MPP+ directly affects microtubule assembly dynamics.
- These findings support the hypothesis that microtubules are involved in mediating the neurotoxic effects of MPP+.
- Microtubule dysfunction may play a role in MPP+-induced neuronal cell death and Parkinsonism.