Cited by 645Inflammasome and immune disordersLiver Disease Diagnosis and TreatmentImmune Response and Inflammation

Fatty acid and endotoxin activate inflammasomes in mouse hepatocytes that release danger signals to stimulate immune cells

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Csak, Timea, Ganz, Michal, Pespisa, Justin, Kodys, Karen, Dolganiuc, Angela, Szabo, Gyongyi·2011·Hepatology

Abstract

The pathogenesis of nonalcoholic steatohepatitis (NASH) and inflammasome activation involves sequential hits. The inflammasome, which cleaves pro–interleukin-1β (pro–IL-1β) into secreted IL-1β, is induced by endogenous and exogenous danger signals. Lipopolysaccharide (LPS), a toll-like receptor 4 ligand, plays a role in NASH and also activates the inflammasome. In this study, we hypothesized that the inflammasome is activated in NASH by multiple hits involving endogenous and exogenous danger signals. Using mouse models of methionine choline–deficient (MCD) diet–induced NASH and high-fat diet–induced NASH, we found up-regulation of the inflammasome [including NACHT, LRR, and PYD domains–containing protein 3 (NALP3; cryopyrin), apoptosis-associated speck-like CARD-domain containing protein, pannexin-1, and pro–caspase-1] at the messenger RNA (mRNA) level increased caspase-1 activity, and mature IL-1β protein levels in mice with steatohepatitis in comparison with control livers. There was no inflammasome activation in mice with only steatosis. The MCD diet sensitized mice to LPS-induced increases in NALP3, pannexin-1, IL-1β mRNA, and mature IL-1β protein levels in the liver. We demonstrate for the first time that inflammasome activation occurs in isolated hepatocytes in steatohepatitis. Our novel data show that the saturated fatty acid (FA) palmitic acid (PA) activates the inflammasome and induces sensitization to LPS-induced IL-1β release in hepatocytes. Furthermore, PA triggers the release of danger signals from hepatocytes in a caspase-dependent manner. These hepatocyte-derived danger signals, in turn, activate inflammasome, IL-1β, and tumor necrosis factor α release in liver mononuclear cells. Conclusion: Our novel findings indicate that saturated FAs represent an endogenous danger in the form of a first hit, up-regulate the inflammasome in NASH, and induce sensitization to a second hit with LPS for IL-β release in hepatocytes. Furthermore, hepatocytes exposed to saturated FAs release danger signals that trigger inflammasome activation in immune cells. Thus, hepatocytes play a key role in orchestrating tissue responses to danger signals in NASH. (HEPATOLOGY 2011;)

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Crossref · 10.1002/hep.24341

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  • Hepatocyte death promotes fibrosis indirectly by activating inflammasomes and recruiting inflammatory cells, especially macrophages, which stimulate myofibroblasts and alter ECM turnover.

    “Hepatocyte death promotes fibrosis indirectly through inflammasome activation and recruitment of inflammatory cells, especially macrophages, that stimulate myofibroblasts and alter extracellular matrix turnover (21, 22).”

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Authors
Csak, T., Ganz, M., Pespisa, J., Kodys, K., Dolganiuc, A., & Szabo, G.
Affiliations
University of Massachusetts Chan Medical School (US)
Venue
Hepatology
Published
2011-07
Volume
54
Issue
1
Pages
133-144
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2093025818
Cited by
645
References
37
Citations by year
2026: 16 · 2025: 30 · 2024: 47 · 2023: 38 · 2022: 57 · 2021: 54 · 2020: 62 · 2019: 40 · 2018: 51 · 2017: 54 · 2016: 41 · 2015: 39 · 2014: 42 · 2013: 47 · 2012: 24
FWCI
14.92
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • The Journal of the American Medical Association (JAMA) Network (American Medical Association) (submittedVersion)
  • eScholarship@UMassChan (submittedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK 32520, DK075635, R01DK075635, P30DK032520)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
nonalcoholic steatohepatitis, inflammasome activation, NLRP3, caspase-1, IL-1β, palmitic acid, saturated fatty acids, lipopolysaccharide, endotoxin, pannexin 1, hepatocytes, damage-associated molecular patterns, methionine-choline-deficient diet, high-fat diet
MeSH terms
Animals, Choline Deficiency, Dietary Fats, Disease Models, Animal, Endotoxins, Fatty Acids, Fatty Liver, Female, Immune System, Methionine, Mice, Inbred C57BL, Tumor Necrosis Factor-alpha, Apoptosis, Caspase 1, Hepatocytes, Mice, Interleukin-1beta, Inflammasomes, Non-alcoholic Fatty Liver Disease

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