Cited by 41Liver Disease Diagnosis and TreatmentInflammasome and immune disordersLiver physiology and pathology

Age‐related sensitivity to endotoxin‐induced liver inflammation: Implication of inflammasome/IL‐1β for steatohepatitis

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Chung, Ki Wung, Lee, Eun Kyeong, Kim, Dae Hyun, An, Hye Jin, Kim, Nam Deuk, Im, Dong Soon, Lee, Jaewon, Yu, Byung Pal +1 more·2015·Aging Cell

Abstract

Aging is associated with increased vulnerability to inflammatory challenge. However, the effects of altered inflammatory response on the metabolic status of tissues or organs are not well documented. In this study, we present evidence demonstrating that lipopolysaccharide (LPS)-induced upregulation of the inflammasome/IL-1β pathway is accompanied with an increased inflammatory response and abnormal lipid accumulation in livers of aged rats. To monitor the effects of aging on LPS-induced inflammation, we administered LPS (2 mg kg(-1) ) to young (6-month old) and aged (24-month old) rats and found abnormal lipid metabolism in only aged rats with increased lipid accumulation in the liver. This lipid accumulation in the liver was due to the dysregulation of PPARα and SREBP1c. We also observed severe liver inflammation in aged rats as indicated by increased ALT levels in serum and increased Kupffer cells in the liver. Importantly, among many inflammation-associated factors, the aged rat liver showed chronically increased IL-1β production. Increased levels of IL-1β were caused by the upregulation of caspase-1 activity and inflammasome activation. In vitro studies with HepG2 cells demonstrated that treatment with IL-1β significantly induced lipid accumulation in hepatocytes through the regulation of PPARα and SREBP1c. In summary, we demonstrated that LPS-induced liver inflammation and lipid accumulation were associated with a chronically overactive inflammasome/IL-1β pathway in aged rat livers. Based on the present findings, we propose a mechanism of aging-associated progression of steatohepatitis induced by endotoxin, delineating a pathogenic role of the inflammasome/IL-1β pathway involved in lipid accumulation in the liver.

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  • Chronically overactive inflammasome activity and production of IL-1β is associated with abnormal lipid accumulation in old rat liver resulting in steatohepatitis.

    “Moreover, chronically overactive inflammasome activity and production of IL-1β has been associated with the abnormal lipid accumulation in old rat liver resulting in steatohepatitis (Chung et al., 2015).”
  • Chronically overactive inflammasome activity and production of IL-1β have been associated with abnormal lipid accumulation in old rat liver resulting in steatohepatitis.

    “chronically overactive inflammasome activity and production of IL-1β has been associated with the abnormal lipid accumulation in old rat liver resulting in steatohepatitis (Chung et al., 2015).”
  • Inflammasome activity has been associated with dysregulation of PPARα and SREBP1c.

    “The activity of inflammasome has been associated with dysregulation of PPARα and SREBP1c (Chung et al., 2015).”

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Authors
Chung, K. W., Lee, E. K., Kim, D. H., An, H. J., Kim, N. D., Im, D. S., Lee, J., Yu, B. P., & Chung, H. Y.
Affiliations
  • Pusan National University (KR)
  • The University of Texas at San Antonio Health Science Center (US)
Corresponding author
Chung, Hae Young
Venue
Aging Cell
Publisher
Wiley
Published
2015-04-07
Volume
14
Issue
4
Pages
524-533
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W1970030711
Cited by
41
References
38
Citations by year
2026: 3 · 2025: 3 · 2024: 2 · 2023: 9 · 2022: 4 · 2021: 2 · 2020: 4 · 2019: 5 · 2018: 4 · 2017: 3 · 2016: 1 · 2015: 1
FWCI
2.35
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
Ministry of Science, ICT and Future Planning (No. 2009-0083538)
Topics
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
Keywords
aging, steatohepatitis, endotoxin, lipopolysaccharide, liver inflammation, inflammasome, IL-1β, caspase-1, hepatic lipid accumulation, PPARα, SREBP-1c, Kupffer cells, hepatocytes, metabolic inflammation
MeSH terms
Age Factors, Aging, Alanine Transaminase, Animals, Fatty Liver, Gene Expression Regulation, Humans, Kupffer Cells, Lipopolysaccharides, Liver, Male, Signal Transduction, Rats, Sprague-Dawley, Caspase 1, PPAR alpha, Lipid Metabolism, Rats, Sterol Regulatory Element Binding Protein 1, Interleukin-1beta, Hep G2 Cells, Inflammasomes

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