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Neuropathology in mice expressing human alpha-synuclein
H van der Putten1, K H Wiederhold, A Probst
1Nervous System Research, Novartis Pharma Inc., CH 4002 Basel, Switzerland. p_herman.van_der_putten@pharma.novartis.com
Summary
Alpha-synuclein protein aggregation causes Lewy body diseases like Parkinson's. Transgenic mice expressing mutant or wild-type alpha-synuclein developed similar pathologies, aiding research into these neurodegenerative conditions.
Area of Science:
- Neuroscience
- Genetics
- Pathology
Background:
- Presynaptic protein alpha-synuclein is implicated in Lewy body diseases, including Parkinson's disease.
- Mutations in the alpha-synuclein gene are linked to familial Parkinson's disease.
- Alpha-synuclein aggregates in Lewy bodies and neurites.
Purpose of the Study:
- To investigate the role of alpha-synuclein in neurodegeneration using transgenic mouse models.
- To explore the pathological similarities between human Lewy body diseases and mouse models expressing alpha-synuclein.
Main Methods:
- Generation of transgenic mice expressing mutant (A53T) or wild-type human alpha-synuclein under Thy1 regulatory control.
- Analysis of neuronal pathology, including Lewy-like inclusions, neuronal degeneration, and motor deficits.
- Examination of transgene expression patterns and affected neuronal populations.
Main Results:
- Transgenic mice expressing A53T mutant alpha-synuclein exhibited neuronal alpha-synucleinopathy, neuronal degeneration, and motor defects.
- Pathological changes were observed in brainstem and motor neurons, with axonal damage and neuromuscular junction denervation.
- Expression of wild-type alpha-synuclein also induced similar pathological alterations.
Conclusions:
- Both mutant and wild-type alpha-synuclein play a role in familial and sporadic forms of diseases characterized by neuronal alpha-synucleinopathy and Lewy pathology.
- These mouse models are valuable tools for studying alpha-synucleinopathies and testing therapeutic interventions.
- Alpha-synuclein may interfere with universal mechanisms of synapse maintenance.