Nox2 dependent redox-regulation of microglial response to amyloid-β stimulation and microgliosis in aging
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Abstract Microglia express constitutively a Nox2 enzyme that is involved in neuroinflammation by the generation of reactive oxygen species (ROS). Amyloid β (Aβ) plays a crucial role in Alzheimer’s disease. However, the mechanism of Aβ-induced microglial dysfunction and redox-regulation of microgliosis in aging remains unclear. In this study, we examined Nox2-derived ROS in mediating microglial response to Aβ peptide 1–42 (Aβ42) stimulation in vitro, in aging-associated microgliosis in vivo and in post-mortem human samples. Compared to controls, Aβ42 markedly induced BV2 cell ROS production, Nox2 expression, p47phox and ERK1/2 phosphorylation, cell proliferation and IL-1β secretion. All these changes could be inhibited to the control levels in the presence of Nox2 inhibitor or superoxide scavenger. Compared to young (3–4 months) controls, midbrain tissues from wild-type aging mice (20–22 months) had significantly higher levels of Nox2-derived ROS production, Aβ deposition, microgliosis and IL-1β production. However, these aging-related changes were reduced or absent in Nox2 knockout aging mice. Clinical significance of aging-associated Nox2 activation, microgliosis and IL-1β production was investigated using post-mortem midbrain tissues of humans at young (25–38 years) and old age (61–85 years). In conclusion, Nox2-dependent redox-signalling is crucial in microglial response to Aβ42 stimulation and in aging-associated microgliosis and brain inflammation.
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NOX activation is evident in the Alzheimer's disease brain, and NOX2 is highly expressed in microglia.
“NOX activation is evident in the AD brain, in addition NOX2 is highly expressed in microglia [108,109].”
From Role of Oxidative Damage in Alzheimer’s Disease and Neurodegeneration: From Pathogenic Mechanisms to Biomarker Discovery (2021) · cites this paper as [109]
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- Authors
- Geng, L., Fan, L. M., Liu, F., Smith, C., & Li, J. M.
- Affiliations
- University of Surrey (GB)
- University of Oxford (GB)
- University of Reading (GB)
- University of Edinburgh (GB)
- Corresponding author
- Li, Jian -Mei
- Venue
- Scientific Reports
- Published
- 2020-01-31
- Volume
- 10
- Issue
- 1
- Pages
- 1582-1582
- ISSN
- 2045-2322 (ISSN-L)
- PMC
- PMC6994719
- OpenAlex
- W3003640680
- Cited by
- 69
- References
- 31
- Citations by year
- 2026: 8 · 2025: 13 · 2024: 13 · 2023: 9 · 2022: 10 · 2021: 11 · 2020: 5
- FWCI
- 3.37
- Type
- journal article
- Language
- en
- Update notices
- correction (2023-03-31)
- Open access
- gold
- doi.org
- Locations
- Scientific Reports (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Edinburgh Research Explorer (University of Edinburgh) (acceptedVersion, cc-by)
- CentAUR (University of Reading) (acceptedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Medical Research Council (MR/L016400/1)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
- Keywords
- NOX2, NADPH oxidase, reactive oxygen species, microglia, amyloid-beta 42, microglial activation, aging, Alzheimer's disease, neuroinflammation, IL-1β, ERK1/2 phosphorylation, p47phox, redox signaling, BV-2 cells, midbrain
- MeSH terms
- NADPH Oxidase 2, Adult, Aged, Aged, 80 and over, Aging, Animals, Female, Humans, Male, Mice, Inbred C57BL, Microscopy, Fluorescence, Middle Aged, Oxidation-Reduction, Peptide Fragments, Amyloid beta-Peptides, Reactive Oxygen Species, Microglia, Mice, Knockout, Mice
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