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Involvement of tubulin in MPP+ neurotoxicity on NGF-differentiated PC12 cells
G Cappelletti1, C Incani, R Maci
1Dipartimento di Biologia, Università degli Studi di Milano, Italy.
Abstract:
In vivo, the neurotoxin MPTP is oxidated to MPP+, which is toxic to dopaminergic neurons. In this paper, we have used MPP+ as a tool to evoke neurotoxicity in the PC12 cell line and investigate the intracellular events that are involved. A cytotoxicity test, performed on undifferentiated and NGF-differentiated PC12 cells, showed that MPP+ is much more toxic on differentiated cells and indicated the suitable range of concentrations for studying the starting events evoked by the neurotoxin. By indirect immunofluorescence we have shown that the localisation of alpha- and beta -tubulin in NGF-differentiated cells was modified by a 24 h treatment with 15 mumol/l MPP+. A biochemical analysis was performed on cell extracts and the results showed that MPP+ treatment induced an increase in alpha -tubulin levels and a decrease in beta -tubulin levels. These results suggest the involvement of the two microtubule proteins in MPP+ neurotoxicity on NGF-differentiated PC12 cells.
Insights
MPP+ (1-methyl-4-phenylpyridinium) neurotoxicity affects differentiated PC12 cells more significantly. MPP+ alters alpha- and beta-tubulin localization and levels, suggesting their role in this neurotoxicity.
Area of Science:
- Neuroscience
- Cell Biology
- Toxicology
Background:
- The neurotoxin MPTP (1-methyl-4-phenylpyridinium) is metabolized to MPP+ in vivo, causing toxicity to dopaminergic neurons.
- MPP+ serves as a valuable tool for inducing neurotoxicity in cellular models to study underlying mechanisms.
Purpose of the Study:
- To investigate the intracellular events involved in MPP+ induced neurotoxicity.
- To utilize the PC12 cell line as a model for studying MPP+ neurotoxicity.
Main Methods:
- Cytotoxicity assays were performed on undifferentiated and NGF-differentiated PC12 cells.
- Indirect immunofluorescence was used to examine the localization of alpha- and beta-tubulin.
- Biochemical analysis of cell extracts assessed changes in tubulin protein levels.
Main Results:
- MPP+ exhibited significantly higher toxicity in NGF-differentiated PC12 cells compared to undifferentiated cells.
- Treatment with MPP+ altered the localization of alpha- and beta-tubulin in differentiated cells.
- MPP+ treatment led to an increase in alpha-tubulin and a decrease in beta-tubulin levels.
Conclusions:
- Differentiated PC12 cells are more susceptible to MPP+ neurotoxicity.
- Changes in alpha- and beta-tubulin localization and levels are implicated in MPP+ neurotoxicity.
- Microtubule proteins play a role in the neurotoxic effects of MPP+ on differentiated PC12 cells.