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Published on: April 21, 2023
NOX activity is increased in mild cognitive impairment.
Annadora J Bruce-Keller1, Sunita Gupta, Taryn E Parrino
1Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana 70808, USA. annadora.bruce-keller@pbrc.edu
NADPH oxidase (NOX) activity increases in the temporal lobe during mild cognitive impairment, suggesting a role in early Alzheimer's disease pathogenesis. This NOX upregulation in neurons may contribute to disease development.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
- The role of NADPH oxidase (NOX) in AD pathogenesis is not fully understood.
- Investigating NOX in early stages of cognitive decline is crucial.
Purpose of the Study:
- To investigate the profile of NADPH oxidase (NOX) activity and expression in relation to Alzheimer's disease (AD) clinical progression.
- To evaluate NOX in affected (temporal gyri) and unaffected (cerebellum) brain regions across different stages of cognitive decline, including mild cognitive impairment (MCI).
Main Methods:
- Longitudinal study of control, preclinical AD, MCI, and late-stage AD subjects.
- Measurement of NOX activity and expression of p47phox and gp91phox subunits in brain tissue.
- Immunohistochemical analysis of NOX expression in microglia and neurons.
- In vitro experiments assessing the effect of NOX inhibition on amyloid beta-induced neuronal injury.
Main Results:
- Significant elevations in NOX activity and expression were observed in the temporal gyri of MCI patients compared to controls.
- No significant changes in NOX activity or expression were found in preclinical AD, late-stage AD, or cerebellar samples.
- Immunohistochemistry revealed gp91phox expression in both microglia and neurons.
- In vitro studies demonstrated that NOX inhibition protected neurons from amyloid beta-induced injury.
Conclusions:
- NOX expression and activity are specifically upregulated in a vulnerable brain region (temporal gyri) during mild cognitive impairment (MCI).
- Increased NOX-associated redox pathways in neurons may contribute to the early pathogenesis of Alzheimer's disease.
- Targeting NOX could be a potential therapeutic strategy for early-stage AD intervention.
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