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Related Experiment Video

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Adipose type I interferon signalling protects against metabolic dysfunction.

Verena Wieser1, Timon Erik Adolph1, Christoph Grander1

  • 1Department of Internal Medicine I, Gastroenterology, Endocrinology & Metabolism, Medical University Innsbruck, Innsbruck, Austria.

Gut
|December 25, 2016
PubMed
Summary

Type I interferon (IFN) signaling in liver and fat cells impacts metabolic disease. Disrupting this pathway worsens insulin resistance and fatty liver, highlighting its role in obesity and NAFLD.

Keywords:
FATTY LIVERGLUCOSE METABOLISMINTERFERONNONALCOHOLIC STEATOHEPATITIS

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Area of Science:

  • Immunology
  • Metabolic Diseases
  • Hepatology

Background:

  • Low-grade chronic inflammation drives insulin resistance and glucose dysregulation in obesity and non-alcoholic fatty liver disease (NAFLD).
  • Type I interferon (IFN) signaling, crucial for immune responses, has an understudied role in metabolic diseases like NAFLD.

Purpose of the Study:

  • To investigate the impact of type I IFN signaling disruption in specific tissues on glucose metabolism, obesity, and liver disease.
  • To explore the role of type I IFN-regulated genes in human obesity following bariatric surgery.

Main Methods:

  • Tissue-specific deletion of interferon (α and β) receptor 1 (Ifnar1) in hepatocytes, adipocytes, intestinal epithelial cells, or myelocytes in mice on high-fat or methionine-choline-deficient (MCD) diets.
  • Analysis of type I IFN-regulated gene expression in obese patients before and after laparoscopic adjustable gastric banding (LAGB).

Main Results:

  • Hepatocyte-specific Ifnar1 deletion worsened MCD diet-induced steatosis and inflammation.
  • Adipocyte-specific Ifnar1 deletion exacerbated high-fat diet-induced weight gain, insulin resistance, and glucose intolerance.
  • LAGB in obese patients correlated with increased type I IFN-regulated gene expression in adipose tissue and liver.

Conclusions:

  • Adipose and hepatocyte type I IFN signaling play critical roles in diet-induced metabolic dysfunction and hepatic disease.
  • Further research into type I IFN signaling in metabolic diseases is warranted.