Cited by 132Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchRedox biology and oxidative stress

NADPH-oxidase activation and cognition in Alzheimer disease progression

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Ansari, Mubeen A., Scheff, Stephen W.·2011·Free Radical Biology and Medicine

Abstract

Superoxide production via NADPH-oxidase (NOX) has been shown to play a role in a variety of neurological disorders, including Alzheimer disease (AD). To improve our understanding of the NOX system and cognitive impairment, we studied the various protein components of the phagocytic isoform (gp91(phox), or NOX2) in the frontal and temporal cortex of age- and postmortem-matched samples. Individuals underwent antemortem cognitive testing and postmortem histopathologic assessment to determine disease progression and assignment to one of the following groups: no cognitive impairment (NCI), preclinical AD, mild cognitive impairment (MCI), early AD, and mild-to-moderate AD. Biochemical methods were used to determine overall NOX activity as well as levels of the various subunits (gp91(phox), p67(phox), p47(phox), p40(phox), and p22(phox)). Overall enzyme activity was significantly elevated in the MCI cohort in both cortical regions compared to the NCI cohort. This activity level remained elevated in the AD groups. Only the NOX cytosolic subunit proteins (p67(phox), p47(phox), and p40(phox) ) were significantly elevated with disease progression; the membrane-bound subunits (gp91(phox) and p22(phox)) remained stable. In addition, there was a robust correlation between NOX activity and the individual's cognitive status such that as the enzyme activity increased, cognitive performance decreased. Collectively, these data show that upregulated NADPH-oxidase in frontal and temporal cortex suggests that increases in NOX-associated redox pathways might participate in early pathogenesis and contribute to AD progression.

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Crossref · 10.1016/j.freeradbiomed.2011.03.025

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Authors
Ansari, M. A., & Scheff, S. W.
Affiliations
University of Kentucky (US)
Corresponding author
Scheff, Stephen W.
Venue
Free Radical Biology and Medicine
Publisher
Elsevier BV
Published
2011-07
Volume
51
Issue
1
Pages
171-178
ISSN
0891-5849 (ISSN-L)
OpenAlex
W2068872788
Cited by
131
References
43
Citations by year
2026: 1 · 2025: 6 · 2024: 9 · 2023: 9 · 2022: 7 · 2021: 15 · 2020: 13 · 2019: 7 · 2018: 7 · 2017: 8 · 2016: 9 · 2015: 6 · 2014: 12 · 2013: 9 · 2012: 10
FWCI
7.41
Type
journal article
Language
en
Open access
Locations
  • Free Radical Biology and Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (AG27219, PO1 AG14449, AG028383)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
NADPH oxidase, Alzheimer's disease, cognitive impairment, mild cognitive impairment, superoxide production, gp91phox, p67phox, p47phox, p40phox, p22phox, frontal cortex, temporal cortex, redox pathways, disease progression, postmortem brain
MeSH terms
NADPH Oxidase 2, Aged, Aged, 80 and over, Alzheimer Disease, Cognition, Enzyme Activation, Female, Humans, Male, Membrane Glycoproteins, Superoxides, Blotting, Western, Oxidative Stress, Disease Progression, NADPH Oxidases

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