Cited by 235Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

Expression of interleukin-18 is increased in the brains of Alzheimer’s disease patients

Ojala, Johanna, Alafuzoff, Irina, Herukka, Sanna-Kaisa, van Groen, Thomas, Tanila, Heikki, Pirttilä, Tuula·2009·Neurobiology of Aging

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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Crossref · 10.1016/j.neurobiolaging.2007.06.006

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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).”

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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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