NADPH oxidase 2 activity in Parkinson's disease
Matthew T Keeney1, Eric K Hoffman2, Kyle Farmer2
1Pittsburgh Institute for Neurodegenerative Diseases, Pittsburgh, PA 15213, USA; Department of Neurology, University of Pittsburgh, Pittsburgh, PA 15213, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Neurobiology of Disease
|May 16, 2022
Summary
Neuronal NADPH oxidase 2 (NOX2) activation drives Parkinson's disease pathology, including alpha-synuclein modification and mitochondrial dysfunction. Specific NOX2 inhibitors show promise for treating this neurodegenerative disorder.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Mitochondrial dysfunction and oxidative stress are key in Parkinson's disease (PD).
- NADPH oxidase 2 (NOX2) activation by superoxide is implicated, but neuronal NOX2's role is unclear.
- Existing NOX2 inhibitors lack specificity.
Purpose of the Study:
- To investigate the role of neuronal NOX2 in PD pathogenesis.
- To develop and validate a specific assay for NOX2 activity.
- To evaluate the therapeutic potential of specific NOX2 inhibitors in PD.
Main Methods:
- Developed and validated a proximity ligation assay for NOX2 activity.
- Assessed NOX2 activity in human PD samples and animal models (acute, sub-acute, chronic).
- Utilized in vitro neuronal cultures and in vivo rat models with a specific NOX2 inhibitor.
Main Results:
- Neuronal and microglial NOX2 are active in chronic PD models; neuronal NOX2 is active in early PD models.
- NOX2 activity causes oxidative modifications of alpha-synuclein and impairs mitochondrial protein import.
- A specific NOX2 inhibitor blocked neuronal NOX2 activation and downstream effects, including LRRK2 activation, in rats.
Conclusions:
- Neuronal NOX2 plays a critical role in early and progressive PD.
- NOX2 contributes to oxidative damage, alpha-synuclein pathology, and mitochondrial dysfunction.
- Targeting NOX2 with specific inhibitors offers a potential disease-modifying therapeutic strategy for Parkinson's disease.
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