Cited by 721Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsNeurological Disease Mechanisms and Treatments

β-Amyloid Stimulation of Microglia and Monocytes Results in TNFα-Dependent Expression of Inducible Nitric Oxide Synthase and Neuronal Apoptosis

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Combs, Colin K., Karlo, J. Colleen, Kao, Shih-Chu, Landreth, Gary E.·2001·The Journal of Neuroscience

Abstract

Reactive microglia associated with the β-amyloid plaques in Alzheimer's disease (AD) brains initiate a sequence of inflammatory events integral to the disease process. We have observed that fibrillar β-amyloid peptides activate a tyrosine kinase-based signaling response in primary mouse microglia and the human monocytic cell line, THP-1, resulting in production of neurotoxic secretory products, proinflammatory cytokines, and reactive oxygen species. We report that most of the amyloid-induced tyrosine kinase activity was stimulated after activation of Src family members such as Lyn. However, transduction of the signaling response required for increased production of the cytokines TNFα and IL1-β was mediated by the nonreceptor tyrosine kinase, Syk. Additionally, β-amyloid stimulated an NFκB-dependent pathway in parallel that was required for cytokine production. Importantly, TNFα generated by the monocytes and microglia was responsible for the majority of the neuorotoxic activity secreted by these cells after β-amyloid stimulation but must act in concert with other factors elaborated by microglia to elicit neuronal death. Moreover, we observed that the neuronal loss was apoptotic in nature and involved increased neuronal expression of inducible nitric oxide synthase and subsequent peroxynitrite production. Selective inhibitors of inducible nitric oxide synthase effectively protected cells from toxicity associated with the microglial and monocytic secretory products. This study demonstrates a functional linkage between β-amyloid-dependent activation of microglia and several characteristic markers of neuronal death occurring in Alzheimer's disease brains.

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Crossref · 10.1523/jneurosci.21-04-01179.2001

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  • Increased iNOS and decreased Arg-1 found in MG-AD are consistent with a pro-inflammatory status.

    “The increased iNOS and decreased Arg-1 found in MG-AD are consistent with a pro-inflammatory status, as previously documented in AD microglia [105,106].”

    From Emerging Role of miR-21-5p in Neuron–Glia Dysregulation and Exosome Transfer Using Multiple Models of Alzheimer’s Disease (2022) · cites this paper as [106]

    The introduction and Discussion (page unavailable) describe amyloid-stimulated microglia as pro-inflammatory. But the increased iNOS measured in this study was in neurons exposed to products from stimulated microglia, not in AD microglia, and the paper does not report decreased Arg-1. It therefore supports the inflammatory context, not the specific marker pattern attributed to AD microglia. (LLM, conf=0.84)

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Research works printed but not linked: 1

  1. McGeer PL, Schulzer M, McGeer EG (1996) Arthritis and anti- inflammatory agents as possible protective factors for Alzheimer's disease: a review of 17 epidemiologic studies. Neurology 47:425-432.

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Authors
Combs, C. K., Karlo, J. C., Kao, S.-C., & Landreth, G. E.
Affiliations
Case Western Reserve University (US)
Venue
The Journal of Neuroscience
Published
2001-02-15
Volume
21
Issue
4
Pages
1179-1188
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2135482947
Cited by
721
References
8
Citations by year
2026: 12 · 2025: 23 · 2024: 49 · 2023: 30 · 2022: 22 · 2021: 24 · 2020: 26 · 2019: 24 · 2018: 15 · 2017: 22 · 2016: 26 · 2015: 30 · 2014: 27 · 2013: 30 · 2012: 35
FWCI
17.14
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (AG08012)
  • National Institute on Aging (AG-08012, P50AG008012, R01AG016740, AG-16740)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD0710422)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
amyloid-beta, Alzheimer's disease, microglia, monocytes, TNF-α, inducible nitric oxide synthase, neuronal apoptosis, Lyn kinase, Src family kinases, NF-κB signaling, IL-1β, peroxynitrite, neuroinflammation, neurotoxicity, THP-1 cells
MeSH terms
Syk Kinase, Contraindications, Alzheimer Disease, Animals, Cells, Cultured, Enzyme Precursors, Humans, Inflammation, Mice, Inbred C57BL, Monocytes, Neurons, Peptide Fragments, Protein-Tyrosine Kinases, Transcription Factors, Tumor Necrosis Factor-alpha, Signal Transduction, Amyloid beta-Peptides, NF-kappa B, Apoptosis, Microglia, Nitric Oxide Synthase, src-Family Kinases, Intracellular Signaling Peptides and Proteins, Mice, Nitric Oxide Synthase Type II

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