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Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains
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NEDD4-mediated HSF1 degradation underlies α-synucleinopathy
Eunhee Kim1, Bin Wang1, Namratha Sastry2
1Department of Pharmacology and Department of Anatomy and Neurobiology, University of Tennessee Health Science Center, 874 Union Avenue/Crowe 401, Memphis, TN 38163, USA.
Human Molecular Genetics
|October 28, 2015
Summary
Aggregated alpha-synuclein causes heat shock transcription factor 1 (HSF1) degradation, a key mechanism in neurodegeneration. Restoring HSF1 levels may offer a therapeutic strategy for proteinopathic diseases like Parkinson's.
Area of Science:
- Neuroscience
- Molecular Biology
- Cellular Biology
Background:
- Cellular protein homeostasis relies on chaperones and proteasomes to prevent toxic protein aggregate buildup, common in neurodegenerative diseases.
- Neurons are vulnerable to aggregation-prone proteins like alpha-synuclein.
- Heat shock transcription factor 1 (HSF1) activation, via Hsp90 inhibition, is explored for proteinopathic diseases, but its role in neurodegeneration is unclear.
Purpose of the Study:
- To investigate the dysregulation of HSF1 in neurodegeneration, specifically in the context of alpha-synuclein aggregation.
- To identify the molecular mechanisms underlying HSF1 dysregulation.
- To explore therapeutic interventions targeting HSF1 stability.
Main Methods:
- Studied HSF1 degradation in neuroblastoma cells transfected with aggregated alpha-synuclein.
- Validated findings in vivo using mouse models and in situ in human alpha-synucleinopathy specimens.
- Investigated the role of ubiquitin E3 ligase NEDD4 and SIRT1-mediated deacetylation in HSF1 stability, focusing on Lys 80 acetylation.
Main Results:
- Discovered aberrant degradation of HSF1 induced by aggregated alpha-synuclein in neuronal cells.
- Confirmed HSF1 dysregulation in mouse models and human tissues affected by alpha-synucleinopathy.
- Identified NEDD4 as the E3 ligase responsible for HSF1 degradation via the ubiquitin-proteasome system (UPS).
- Showed that SIRT1-mediated deacetylation attenuates NEDD4-induced HSF1 degradation.
- Defined Lys 80 acetylation of HSF1 as critical for protein stability.
Conclusions:
- Aberrant HSF1 degradation by aggregated alpha-synuclein is a significant neurodegenerative mechanism.
- NEDD4-mediated HSF1 degradation is implicated in alpha-synucleinopathy.
- Modulating HSF1 acetylation and stability presents a potential therapeutic avenue for neurodegenerative diseases.
