Cited by 106Cytokine Signaling Pathways and InteractionsMetabolism, Diabetes, and CancerAdipokines, Inflammation, and Metabolic Diseases

AMP-activated protein kinase inhibits IL-6-stimulated inflammatory response in human liver cells by suppressing phosphorylation of signal transducer and activator of transcription 3 (STAT3)

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Nerstedt, A., Johansson, A., Andersson, C. X., Cansby, E., Smith, U., Mahlapuu, M.·2010·Diabetologia

Abstract

Aim/hypothesis The aim of the study was to examine the possible role of AMP-activated protein kinase (AMPK) in the regulation of the inflammatory response induced by cytokine action in human liver cells.Methods IL-6-stimulated expression of the genes for acute-phase response markers serum amyloid A (SAA1, SAA2) and haptoglobin (HP) in the human hepatocarcinoma cell line HepG2 were quantified after modulation of AMPK activity by pharmacological agonists (5-amino-4-imidazole-carboxamideriboside [AICAR], metformin) or by using small interfering (si) RNA transfection. The intracellular signalling pathway mediating the effect of AMPK on IL-6-stimulated acute-phase marker expression was characterised by assessing the phosphorylation levels of the candidate protein signal transducer and activator of transcription 3 (STAT3) in response to AMPK agonists.Results AICAR and metformin markedly blunt the IL-6-stimulated expression of SAA cluster genes as well as of haptoglobin in a dose-dependent manner. Moreover, the repression of AMPK activity by siRNA significantly reversed the inhibition of SAA expression by both AICAR and metformin, indicating that the effect of the agonists is dependent on AMPK. For the first time we show that AMPK appears to regulate IL-6 signalling by directly inhibiting the activation of the main downstream target of IL-6, STAT3.Conclusions/interpretation We provide evidence for a key function of AMPK in suppression of the acute-phase response caused by the action of IL-6 in liver, suggesting that AMPK may act as an intracellular link between chronic low-grade inflammation and metabolic regulation in peripheral metabolic tissues.

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  • AMPK exerted its anti-inflammatory roles on the vasculature partially via the inhibition of adhesion molecules and chemoattractants by regulating signal transducer and activator of transcription 3, of nuclear factor kappa B, and p300 pathways.

    “Indeed, studies have uncovered that AMPK exerted its anti-inflammatory roles on the vasculature partially via the inhibition of adhesion molecules and chemoattractants [248,249,252,253] by regulating signal transducer and activator of transcription 3, of nuclear factor kappa B, and p300 pathways [254,255,256].”

    From AMPK, Mitochondrial Function, and Cardiovascular Disease (2020) · cites this paper as [252]

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Authors
Nerstedt, A., Johansson, A., Andersson, C. X., Cansby, E., Smith, U., & Mahlapuu, M.
Affiliations
University of Gothenburg (SE)
Corresponding author
Mahlapuu, M.
Venue
Diabetologia
Published
2010-07-24
Volume
53
Issue
11
Pages
2406-2416
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W2026231752
Cited by
106
References
54
Citations by year
2026: 1 · 2025: 4 · 2024: 4 · 2023: 6 · 2022: 4 · 2021: 8 · 2020: 7 · 2019: 4 · 2018: 3 · 2017: 5 · 2016: 7 · 2015: 11 · 2014: 9 · 2013: 15 · 2012: 10
FWCI
5.21
Type
journal article
Language
en
Open access
Locations
  • Diabetologia (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Eli Lilly and Company
  • European Foundation for the Study of Diabetes
  • Stiftelsen för Strategisk Forskning
  • Novo Nordisk
  • Vetenskapsrådet
  • Svenska Läkaresällskapet
  • Stiftelsen Längmanska Kulturfonden
  • Novo Nordisk Fonden
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
AMPK, IL-6 signaling, STAT3 phosphorylation, acute phase response, serum amyloid A, haptoglobin, hepatocytes, AICAR, metformin, low-grade inflammation, metabolic regulation, liver inflammation
MeSH terms
Aminoimidazole Carboxamide, Cell Survival, Cells, Cultured, Humans, Hypoglycemic Agents, Liver, Metformin, Phosphorylation, Ribonucleotides, Blotting, Western, Signal Transduction, Interleukin-6, Reverse Transcriptase Polymerase Chain Reaction, Hepatocytes, RNA Interference, RNA, Small Interfering, STAT3 Transcription Factor, AMP-Activated Protein Kinases, Hep G2 Cells

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