Cited by 168Adipokines, Inflammation, and Metabolic DiseasesPeroxisome Proliferator-Activated ReceptorsNF-κB Signaling Pathways

NF-κB mediates lipid-induced fetuin-A expression in hepatocytes that impairs adipocyte function effecting insulin resistance

Dasgupta, Suman, Bhattacharya, Sushmita, Biswas, Anindita, Majumdar, Subeer S., Mukhopadhyay, Satinath, Ray, Sukanta, Bhattacharya, Samir·2010·Biochemical Journal

Abstract

Fetuin-A, a hepatic secretory protein, has recently been implicated in insulin resistance and Type 2 diabetes. It is an endogenous inhibitor of insulin receptor tyrosine kinase. However, regulation of fetuin-A synthesis in relation to insulin resistance is unclear. In the present paper, we report that both non-esterified ('free') fatty acids and fetuin-A coexist at high levels in the serum of db/db mice, indicating an association between them. For an in-depth study, we incubated palmitate with HepG2 cells and rat primary hepatocytes, and found enhanced fetuin-A secretion to more than 4-fold over the control. Interestingly, cell lysates from these incubations showed overexpression and activity of NF-kappaB (nuclear factor kappaB). In NF-kappaB-knockout HepG2 cells, palmitate failed to increase fetuin-A secretion, whereas forced expression of NF-kappaB released fetuin-A massively in the absence of palmitate. Moreover, palmitate stimulated NF-kappaB binding to the fetuin-A promoter resulting in increased reporter activity. These results suggest NF-kappaB to be the mediator of the palmitate effect. Palmitate-induced robust expression of fetuin-A indicates the occurrence of additional targets, and we found that fetuin-A severely impaired adipocyte function leading to insulin resistance. Our results reveal a new dimension of lipid-induced insulin resistance and open another contemporary target for therapeutic intervention in Type 2 diabetes.

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Crossref · 10.1042/bj20100330

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Authors
Dasgupta, S., Bhattacharya, S., Biswas, A., Majumdar, S. S., Mukhopadhyay, S., Ray, S., & Bhattacharya, S.
Affiliations
  • Visva-Bharati University (IN)
  • National Institute of Immunology (IN)
  • Institute of Post Graduate Medical Education and Research (IN)
Corresponding author
  • Dasgupta, Suman
  • Bhattacharya, Sushmita
  • Biswas, Anindita
  • Bhattacharya, Samir
Venue
Biochemical Journal
Published
2010-07-14
Volume
429
Issue
3
Pages
451-462
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W1989150212
Cited by
168
References
35
Citations by year
2026: 2 · 2025: 8 · 2024: 12 · 2023: 14 · 2022: 15 · 2021: 13 · 2020: 6 · 2019: 15 · 2018: 7 · 2017: 13 · 2016: 11 · 2015: 9 · 2014: 13 · 2013: 11 · 2012: 10
FWCI
6.75
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
Keywords
fetuin-A, NF-κB, insulin resistance, type 2 diabetes, palmitate, free fatty acids, hepatocytes, adipocyte function, HepG2 cells, db/db mice
MeSH terms
alpha-Fetoproteins, Animals, Base Sequence, Gene Expression Regulation, Humans, Insulin Resistance, Lipids, Male, NF-kappa B, Rats, Sprague-Dawley, Adipocytes, DNA Primers, Hepatocytes, Cell Line, Tumor, Chromatin Immunoprecipitation, Rats

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