Cited by 273Adipokines, Inflammation, and Metabolic DiseasesCytokine Signaling Pathways and InteractionsRegulation of Appetite and Obesity

Interleukin-6 depletion selectively improves hepatic insulin action in obesity.

Klover, Peter J., Clementi, Alicia H., Mooney, Robert A.·2005·Endocrinology

Abstract

Obesity and insulin resistance are considered chronic inflammatory states, in part because circulating IL-6 is elevated. Exogenous IL-6 can induce hepatic insulin resistance in vitro and in vivo. The importance of endogenous IL-6, however, to insulin resistance of obesity is unresolved. To test the hypothesis that IL-6 contributes to the inflammation and insulin resistance of obesity, IL-6 was depleted in Lep(ob) mice by injection of IL-6-neutralizing antibody. In untreated Lep(ob) mice, signal transducer and activator of transcription-3 (STAT3) activation was increased compared with that in lean controls, consistent with an inflammatory state. With IL-6 depletion, activation of STAT3 in liver and adipose tissue and expression of haptoglobin were reduced. Expression of the IL-6-dependent, hepatic acute phase protein fibrinogen was also decreased. Using the hyperinsulinemic-euglycemic clamp technique, insulin-dependent suppression of endogenous glucose production was 89% in IL-6-depleted Lep(ob) mice, in contrast to only 32% in Lep(ob) controls, indicating a marked increase in hepatic insulin sensitivity. A significant change in glucose uptake in skeletal muscle after IL-6 neutralization was not observed. In a direct comparison of hepatic insulin signaling in Lep(ob) mice treated with anti-IL-6 vs. IgG-treated controls, insulin-dependent insulin receptor autophosphorylation and activation of Akt (pSer473) were increased by nearly 50% with IL-6 depletion. In adipose tissue, insulin receptor signaling showed no significant change despite major reductions in STAT3 phosphorylation and haptoglobin expression. In diet-induced obese mice, depletion of IL-6 improved insulin responsiveness in 2-h insulin tolerance tests. In conclusion, these results indicate that IL-6 plays an important and selective role in hepatic insulin resistance of obesity.

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Crossref · 10.1210/en.2004-1468

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Authors
Klover, P. J., Clementi, A. H., & Mooney, R. A.
Affiliations
University of Rochester Medicine (US)
Corresponding author
Mooney, Robert A.
Venue
Endocrinology
Published
2005-08-01
Volume
146
Issue
8
Pages
3417-3427
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W1973416470
Cited by
273
References
46
Citations by year
2026: 4 · 2025: 4 · 2024: 5 · 2023: 5 · 2022: 7 · 2021: 13 · 2020: 7 · 2019: 11 · 2018: 6 · 2017: 13 · 2016: 11 · 2015: 14 · 2014: 19 · 2013: 16 · 2012: 12
FWCI
14.34
Type
journal article
Language
en
Open access
closed
Locations
  • Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK-38138, R01DK038138)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
interleukin-6, hepatic insulin resistance, obesity, IL-6 neutralization, STAT3 activation, haptoglobin, fibrinogen, acute phase proteins, hepatic glucose production, insulin receptor signaling, Akt phosphorylation, adipose tissue, diet-induced obesity, inflammation
MeSH terms
Interleukin-6 Inhibitors, Adipose Tissue, Animals, Antibodies, DNA-Binding Proteins, Haptoglobins, Immunoglobulin G, Inflammation, Insulin, Liver, Male, Mice, Inbred C57BL, Mice, Obese, Obesity, Phosphorylation, Receptor, Insulin, Signal Transduction, Trans-Activators, Polymerase Chain Reaction, STAT3 Transcription Factor, Mice

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