Cited by 84Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismAdipokines, Inflammation, and Metabolic Diseases

Irisin ameliorates hepatic glucose/lipid metabolism and enhances cell survival in insulin-resistant human HepG2 cells through adenosine monophosphate-activated protein kinase signaling

So, Wing Yan, Leung, Po Sing·2016·The International Journal of Biochemistry & Cell Biology

Abstract

Irisin is a newly identified myokine that promotes the browning of white adipose tissue, enhances glucose uptake in skeletal muscle and modulates hepatic metabolism. However, the signaling pathways involved in the effects on hepatic glucose and lipid metabolism have not been resolved. This study aimed to examine the role of irisin in the regulation of hepatic glucose/lipid metabolism and cell survival, and whether adenosine monophosphate-activated protein kinase (AMPK), a master metabolic regulator in the liver, is involved in irisin's actions. Human liver-derived HepG2 cells were cultured in normal glucose-normal insulin (NGNI) or high glucose-high insulin (HGHI/insulin-resistant) condition. Hepatic glucose and lipid metabolism was evaluated by glucose output and glycogen content or triglyceride accumulation assays, respectively. Our results showed that irisin stimulated phosphorylation of AMPK and acetyl-CoA-carboxylase (ACC) via liver kinase B1 (LKB1) rather than Ca(2+)/calmodulin-dependent protein kinase kinase β (CaMKKβ) in HepG2 cells. Irisin ameliorated hepatic insulin resistance induced by HGHI condition. Irisin reduced hepatic triglyceride content and glucose output, but increased glycogen content, with those effects reversed by dorsomorphin, an AMPK inhibitor. Furthermore, irisin also stimulated extracellular signal-regulated kinase (ERK) 1/2 phosphorylation and promoted cell survival in an AMPK-dependent manner. In conclusion, our data indicate that irisin ameliorates dysregulation of hepatic glucose/lipid metabolism and cell death in insulin-resistant states via AMPK activation. These findings reveal a novel irisin-mediated protective mechanism in hepatic metabolism which provides a scientific basis for irisin as a potential therapeutic target for the treatment of insulin resistance and type 2 diabetes mellitus.

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Crossref · 10.1016/j.biocel.2016.07.022

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Authors
So, W. Y., & Leung, P. S.
Affiliations
Chinese University of Hong Kong (HK)
Corresponding author
  • So, Wing Yan
  • Leung, Po Sing
Venue
The International Journal of Biochemistry & Cell Biology
Publisher
Elsevier BV
Published
2016-09
Volume
78
Pages
237-247
ISSN
1357-2725 (ISSN-L)
OpenAlex
W2479660582
Cited by
83
References
58
Citations by year
2026: 4 · 2025: 12 · 2024: 6 · 2023: 10 · 2022: 6 · 2021: 13 · 2020: 9 · 2019: 7 · 2018: 9 · 2017: 7
FWCI
3.99
Type
journal article
Language
en
Open access
closed
Locations
  • The International Journal of Biochemistry & Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
General Research Fund of The Research Grants Council of the Hong Kong Special Administrative Region, China (CUHK14110314)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
irisin, AMPK signaling, hepatic insulin resistance, hepatic glucose metabolism, hepatic lipid metabolism, LKB1, acetyl-CoA carboxylase, ERK1/2 phosphorylation, cell survival, HepG2 cells, type 2 diabetes, myokines, triglyceride accumulation, glycogen content
MeSH terms
Acetyl-CoA Carboxylase, Cell Survival, Enzyme Activation, Fibronectins, Glucose, Humans, Insulin Resistance, Liver, Phosphorylation, Triglycerides, Signal Transduction, Mitogen-Activated Protein Kinase 1, Protein Kinase Inhibitors, Mitogen-Activated Protein Kinase 3, AMP-Activated Protein Kinases, Hep G2 Cells

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