Fetuin-A Induces Cytokine Expression and Suppresses Adiponectin Production
Open accessAbstract
BACKGROUND: The secreted liver protein fetuin-A (AHSG) is up-regulated in hepatic steatosis and the metabolic syndrome. These states are strongly associated with low-grade inflammation and hypoadiponectinemia. We, therefore, hypothesized that fetuin-A may play a role in the regulation of cytokine expression, the modulation of adipose tissue expression and plasma concentration of the insulin-sensitizing and atheroprotective adipokine adiponectin. METHODOLOGY AND PRINCIPAL FINDINGS: Human monocytic THP1 cells and human in vitro differenttiated adipocytes as well as C57BL/6 mice were treated with fetuin-A. mRNA expression of the genes encoding inflammatory cytokines and the adipokine adiponectin (ADIPOQ) was assessed by real-time RT-PCR. In 122 subjects, plasma levels of fetuin-A, adiponectin and, in a subgroup, the multimeric forms of adiponectin were determined. Fetuin-A treatment induced TNF and IL1B mRNA expression in THP1 cells (p<0.05). Treatment of mice with fetuin-A, analogously, resulted in a marked increase in adipose tissue Tnf mRNA as well as Il6 expression (27- and 174-fold, respectively). These effects were accompanied by a decrease in adipose tissue Adipoq mRNA expression and lower circulating adiponectin levels (p<0.05, both). Furthermore, fetuin-A repressed ADIPOQ mRNA expression of human in vitro differentiated adipocytes (p<0.02) and induced inflammatory cytokine expression. In humans in plasma, fetuin-A correlated positively with high-sensitivity C-reactive protein, a marker of subclinical inflammation (r = 0.26, p = 0.01), and negatively with total- (r = -0.28, p = 0.02) and, particularly, high molecular weight adiponectin (r = -0.36, p = 0.01). CONCLUSIONS AND SIGNIFICANCE: We provide novel evidence that the secreted liver protein fetuin-A induces low-grade inflammation and represses adiponectin production in animals and in humans. These data suggest an important role of fatty liver in the pathophysiology of insulin resistance and atherosclerosis.
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Fetuin A suppresses production of adiponectin by adipocytes.
“Fetuin A has been shown to directly induce insulin resistance [189], suppress production of adiponectin by adipocytes [148], and induce pancreatic β-cell toxicity [152].”
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- Authors
- Hennige, A. M., Staiger, H., Wicke, C., Machicao, F., Fritsche, A., Häring, H.-U., & Stefan, N.
- Affiliations
- University of Tübingen (DE)
- Corresponding author
- Stefan, Norbert
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2008-03-12
- Volume
- 3
- Issue
- 3
- Pages
- e1765
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC2258416
- OpenAlex
- W2060405968
- Cited by
- 282
- References
- 55
- Citations by year
- 2026: 5 · 2025: 8 · 2024: 6 · 2023: 11 · 2022: 13 · 2021: 6 · 2020: 20 · 2019: 17 · 2018: 9 · 2017: 17 · 2016: 21 · 2015: 31 · 2014: 15 · 2013: 25 · 2012: 28
- FWCI
- 12.21
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Deutsche Forschungsgemeinschaft (HE 3653/3-1, KFO 114)
- Topics
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
- Keywords
- fetuin-A, adiponectin, adiponectin multimers, low-grade inflammation, hepatic steatosis, metabolic syndrome, TNF-α, IL-1β, interleukin-6, adipose tissue, insulin resistance, atherosclerosis, C-reactive protein, adipokines, THP-1 macrophages, adipocytes
- MeSH terms
- alpha-Fetoproteins, Animals, Blood Glucose, Cell Line, Enzyme-Linked Immunosorbent Assay, Humans, Male, Mice, Inbred C57BL, RNA, Messenger, Cytokines, Reverse Transcriptase Polymerase Chain Reaction, Mice, Adiponectin
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