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Sci Rep. 2016 Jan 20;6:19377. doi: 10.1038/srep19377.

Notch1 deficiency decreases hepatic lipid accumulation by induction of fatty acid oxidation.

Author information

1
Department of Food Science and Biotechnology, Sungkyunkwan University, Korea.
2
School of Pharmacy, Sungkyunkwan University, Korea.
3
Department of Biotechnology, Graduate School of Life Sciences &Biotechnology, BK21-PLUS program, Korea University, 136-713 Seoul Korea.
4
Department of Internal Medicine, Graduate School of Medicine, Gachon University of Medicine and Science.
5
School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology.
6
Department of Genetic Engineering, Sungkyunkwan University, Korea.
7
Laboratory of Neurosciences, National Institute on Aging Intramural Research Program, Baltimore, Maryland, USA.

Abstract

Notch signaling pathways modulate various cellular processes, including cell proliferation, differentiation, adhesion, and communication. Recent studies have demonstrated that Notch1 signaling also regulates hepatic glucose production and lipid synthesis. However, the effect of Notch1 signaling on hepatic lipid oxidation has not yet been directly investigated. To define the function of Notch1 signaling in hepatic lipid metabolism, wild type mice and Notch1 deficient antisense transgenic (NAS) mice were fed a high-fat diet. High-fat diet -fed NAS mice exhibited a marked reduction in hepatic triacylglycerol accumulation compared with wild type obese mice. The improved fatty liver was associated with an increased expression of hepatic genes involved in fatty acid oxidation. However, lipogenic genes were not differentially expressed in the NAS liver, suggesting lipolytic-specific regulatory effects by Notch1 signaling. Expression of fatty acid oxidative genes and the rate of fatty acid oxidation were also increased by inhibition of Notch1 signaling in HepG2 cells. In addition, similar regulatory effects on lipid accumulation were observed in adipocytes. Taken together, these data show that inhibition of Notch1 signaling can regulate the expression of fatty acid oxidation genes and may provide therapeutic strategies in obesity-induced hepatic steatosis.

PMID:
26786165
PMCID:
PMC4726366
DOI:
10.1038/srep19377
[Indexed for MEDLINE]
Free PMC Article

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