Expression of interleukin-18 is increased in the brains of Alzheimer’s disease patients
Abstract
The inflammatory cytokines can initiate nerve cell degeneration and enhance the plaque production typically found in Alzheimer's disease (AD). Interleukin-18 (IL-18) is an inflammatory cytokine, which can induce the expression of interferon-gamma. This interleukin shares similarities with the IL-1 family of proteins. Like IL-1 beta, IL-18 is cleaved by caspase-1 (ICE) to an active secreted form. We examined the expressions of IL-18, -1 beta and ICE in different brain regions from AD patients that were categorized with respect to the Braak stage, and age-matched with non-demented controls. The levels of total-RNA and protein of IL-18 and ICE were increased, especially in the frontal lobe of AD patients and this change was not modified by ApoE genotype. Immunohistochemistry of AD brain samples detected IL-18 in microglia, astrocytes, and surprisingly in neurons, and it is also co-localized not only with amyloid-beta plaques but also with tau. In CSF, elevated IL-18 level was detected only in men and it also correlated with CSF tau in MCI. IL-18 may thus be a potential biomarker for men. Plasma levels of IL-18 showed no correlation with the disease. In conclusion, amyloid-beta may induce the synthesis of IL-18, and IL-18 kinases involved in tau phosphorylation as a part of the amyloid-associated inflammatory reaction.
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Higher expression of IL-1β and IL-18 has been reported in microglia, astrocytes, and neurons surrounding Aβ plaques or in plasma of AD patients.
“Inflammasome and its products have been implicated in AD pathogenesis since a higher expression of IL-1β and IL-18 has been reported in the microglia, astrocytes, and neurons that surround Aβ plaques or in the plasma of AD patients (221–225).”
From The gut-brain axis: how microbiota and host inflammasome influence brain physiology and pathology (2020) · cites this paper as [223]
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Self-citation
- Authors
- Ojala, J., Alafuzoff, I., Herukka, S.-K., van Groen, T., Tanila, H., & Pirttilä, T.
- Affiliations
- University of Eastern Finland (FI)
- Corresponding author
- Ojala, Johanna
- Venue
- Neurobiology of Aging
- Publisher
- Elsevier BV
- Published
- 2009-02
- Volume
- 30
- Issue
- 2
- Pages
- 198-209
- ISSN
- 0197-4580 (ISSN-L)
- OpenAlex
- W2075539642
- Cited by
- 235
- References
- 49
- Citations by year
- 2026: 12 · 2025: 13 · 2024: 19 · 2023: 20 · 2022: 10 · 2021: 19 · 2020: 17 · 2019: 18 · 2018: 12 · 2017: 15 · 2016: 15 · 2015: 8 · 2014: 16 · 2013: 8 · 2012: 9
- FWCI
- 4.45
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neurobiology of Aging (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Keywords
- IL-18, Alzheimer's disease, caspase-1, IL-1β, amyloid plaques, tau protein, microglia, astrocytes, neurons, cerebrospinal fluid biomarkers, mild cognitive impairment, Braak stages, APOE genotype, neuroinflammation, tau phosphorylation
- MeSH terms
- Alzheimer Disease, Brain, Humans, Up-Regulation, Cytokines, Caspase 1, Interleukin-18
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