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Related Experiment Videos

Lipids up-regulate uncoupling protein 2 expression in rat hepatocytes.

H Cortez-Pinto1, H Zhi Lin, S Qi Yang

  • 1Department of Medicine, The Johns Hopkins University Schools of Medicine and Public Health and Hygiene, Baltimore, Maryland, USA.

Gastroenterology
|April 30, 1999
PubMed
Summary

Lipids induce uncoupling protein 2 (UCP-2) in liver cells, potentially as an adaptive response to excess fatty acids. This process involves reactive oxygen species (ROS) and helps manage lipid accumulation.

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Area of Science:

  • Hepatology
  • Mitochondrial Biology
  • Lipid Metabolism

Background:

  • Hepatic steatosis involves triglyceride and fatty acid accumulation in hepatocytes.
  • While lipids can be hepatotoxic, fatty livers show adaptive responses.
  • Fatty acids induce mitochondrial uncoupling proteins (UCP) 2 and 3 in other tissues; UCP-2 is found in fatty livers of obese mice.

Purpose of the Study:

  • To investigate if lipids up-regulate UCP-2 expression in hepatocytes.
  • To explore the role of reactive oxygen species (ROS) in this induction process.

Main Methods:

  • Rat hepatocytes were treated with lipid emulsions, linoleic acid, or oleic acid.
  • UCP-2 expression was assessed using Northern blotting and immunocytochemistry.
  • NF-kappaB DNA-binding activity and the effects of tert-butyl hydroperoxide (TBHP) and glutathione (GSH) on UCP-2 were measured.

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Main Results:

  • Lipid emulsions increased NF-kappaB DNA-binding activity.
  • Lipids induced UCP-2 transcripts in a dose- and time-dependent manner (4.5-fold increase in mRNA after 24 hours).
  • Increased UCP-2 protein was confirmed; TBHP also increased UCP-2 mRNA, while GSH had no effect, suggesting intracellular ROS involvement.

Conclusions:

  • Lipids induce ROS production and UCP-2 expression in hepatocytes.
  • Hepatocytes may adapt to excess lipid substrates by inducing UCP-2 for disposal and ROS management.