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Semi-Quantitative Determination of Dopaminergic Neuron Density in the Substantia Nigra of Rodent Models using Automated Image Analysis
Published on: February 2, 2021
Increased α-synuclein phosphorylation and nitration in the aging primate substantia nigra
A L McCormack1, S K Mak, D A Di Monte
1German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany.
Cell Death & Disease
|June 1, 2012
Summary
Normal aging in primates increases modified alpha-synuclein (α-synuclein) in dopaminergic neurons, mirroring changes seen in Parkinson's disease. This suggests aging contributes to alpha-synuclein abnormalities linked to neurodegeneration.
Area of Science:
- Neuroscience
- Aging Research
- Neurodegenerative Diseases
Background:
- Post-translational modifications of alpha-synuclein (α-synuclein), including phosphorylation and nitration, are hallmarks of Parkinson's disease and related α-synucleinopathies.
- These modifications are observed in Lewy inclusions within the brains of affected patients.
Purpose of the Study:
- To investigate whether α-synuclein modifications, specifically phospho-Ser 129 and nitrated α-synuclein, occur in dopaminergic neurons during normal aging in primates.
- To explore potential mechanisms linking aging, α-synuclein modifications, and neurodegenerative processes.
Main Methods:
- Immunohistochemical analysis of primate substantia nigra using antibodies against phospho-Ser 129 α-synuclein, nitrated α-synuclein, and unmodified α-synuclein.
- Dual labeling techniques to assess colocalization of different α-synuclein modifications.
- Evaluation of Polo-like kinase 2 expression and markers of oxidative stress in aging neurons.
Main Results:
- Phospho-Ser 129 and nitrated α-synuclein were significantly more frequent in dopaminergic neurons of old primates compared to younger adults.
- Limited colocalization was observed between phospho-Ser 129 and nitrated α-synuclein, indicating distinct neuronal populations are affected.
- Age-related increases in modified α-synuclein correlated with higher levels of unmodified α-synuclein and increased Polo-like kinase 2 expression and oxidative stress.
Conclusions:
- Normal aging in primates leads to the formation of phosphorylated and nitrated α-synuclein within dopaminergic neurons.
- These age-related α-synuclein modifications may be driven by increased protein levels, enhanced kinase activity (e.g., Polo-like kinase 2), and a pro-oxidant environment.
- The findings support a mechanistic link between aging, α-synuclein abnormalities, and increased susceptibility to neurodegenerative processes like Parkinson's disease.
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