Infection and herbicide exposure implicate c-Abl kinase in α-Synuclein Ser129 phosphorylation

Area of Science:

• Neuroscience
• Molecular Biology
• Toxicology

Background:

• Parkinson's disease involves alpha-synuclein aggregation and phosphorylation at Ser129.
• Environmental triggers for Parkinson's disease remain unclear.
• This study investigates infectious and pesticide exposures' impact on alpha-synuclein phosphorylation.

Purpose of the Study:

• To explore how Helicobacter pylori (H. pylori) and rotenone affect alpha-synuclein phosphorylation.
• To identify the role of cellular kinases, particularly c-Abl, in mediating these effects.
• To assess potential therapeutic interventions targeting the c-Abl pathway.

Main Methods:

• Neuronal cells exposed to H. pylori or rotenone.
• Assessed alpha-synuclein phosphorylation and mitochondrial damage via immunofluorescence and Western blotting.
• Utilized c-Abl inhibitors (Ponatinib, Asciminib) and siRNA to investigate c-Abl's role.
• Performed transcriptome analysis to identify affected pathways.

Main Results:

• Both H. pylori and rotenone induced neuroinflammation and stress responses, activating c-Abl.
• c-Abl activation led to increased alpha-synuclein phosphorylation at Ser129.
• c-Abl inhibitors reversed phosphorylation and associated gene expression changes.
• GSK3β identified as a downstream kinase; H. pylori's VacA toxin plays a key role.

Conclusions:

• c-Abl is a critical mediator in alpha-synucleinopathies.
• Shared mechanisms link infection and pesticide exposure to Parkinson's disease pathology.
• Targeting c-Abl offers potential therapeutic strategies for Parkinson's disease.