Nrf2 mitigates LRRK2- and α-synuclein-induced neurodegeneration by modulating proteostasis
Gaia Skibinski1,2,3, Vicky Hwang1,2,3, Dale Michael Ando1,2,3,4
1Gladstone Institute of Neurological Disease, San Francisco, CA 94158.
Summary
Activating nuclear factor erythroid 2-related factor (Nrf2) reduces Parkinson
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Mutations in leucine-rich repeat kinase 2 (LRRK2) and α-synuclein are key genetic drivers of Parkinson's disease (PD).
- Protein homeostasis disruption is increasingly recognized as a central mechanism in PD pathogenesis.
- Targeting pathways that reduce misfolded protein accumulation presents a promising therapeutic avenue for neurodegenerative disorders.
Purpose of the Study:
- To investigate whether activating nuclear factor erythroid 2-related factor (Nrf2) can mitigate neurotoxicity associated with PD.
- To determine if Nrf2 modulates the protein homeostasis network to reduce PD-associated cellular damage.
- To elucidate the specific mechanisms by which Nrf2 impacts mutant LRRK2 and α-synuclein in living neurons.
Main Methods:
- Utilized a longitudinal imaging platform for real-time, single-cell visualization of mutant LRRK2 and α-synuclein metabolism.
- Employed cell-based assays to assess the impact of Nrf2 activation on protein toxicity and homeostasis.
- Analyzed changes in protein degradation pathways and protein aggregation patterns following Nrf2 modulation.
Main Results:
- Nrf2 activation conferred a time-dependent, cell-autonomous reduction in PD-associated protein toxicity.
- Nrf2 employed distinct strategies for different misfolded proteins: it enhanced α-synuclein degradation while promoting LRRK2 sequestration into inclusion bodies.
- Demonstrated that Nrf2 modulates both protein degradation and aggregation to manage distinct misfolded proteins implicated in PD.
Conclusions:
- Nrf2 activation represents a viable therapeutic strategy for reducing neurotoxicity in Parkinson's disease.
- Nrf2's differential regulation of α-synuclein and LRRK2 highlights its complex role in protein homeostasis.
- Identifying Nrf2-activated stress responses provides insights into endogenous mechanisms that could be therapeutically enhanced for PD treatment.
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