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Inhibiting triglyceride synthesis improves hepatic steatosis but exacerbates liver damage and fibrosis in obese mice with nonalcoholic steatohepatitis.

Publication ,  Journal Article
Yamaguchi, K; Yang, L; McCall, S; Huang, J; Yu, XX; Pandey, SK; Bhanot, S; Monia, BP; Li, Y-X; Diehl, AM
Published in: Hepatology
June 2007

UNLABELLED: In the early stages of nonalcoholic fatty liver disease (NAFLD), triglycerides accumulate in hepatocytes. Diacylglycerol acyltransferase 2 (DGAT2) catalyzes the final step in hepatocyte triglyceride biosynthesis. DGAT2 antisense oligonucleotide (ASO) treatment improved hepatic steatosis dramatically in a previous study of obese mice. According to the 2-hit hypothesis for progression of NAFLD, hepatic steatosis is a risk factor for nonalcoholic steatohepatitis (NASH) and fibrosis. To evaluate this hypothesis, we inhibited DGAT2 in a mouse model of NASH induced by a diet deficient in methionine and choline (MCD). Six-week-old genetically obese and diabetic male db/db mice were fed either the control or the MCD diet for 4 or 8 weeks. The MCD diet group was treated with either 25 mg/kg DGAT2 ASO or saline intraperitoneally twice weekly. Hepatic steatosis, injury, fibrosis, markers of lipid peroxidation/oxidant stress, and systemic insulin sensitivity were evaluated. Hepatic steatosis, necroinflammation, and fibrosis were increased in saline-treated MCD diet-fed mice compared to controls. Treating MCD diet-fed mice with DGAT2 ASO for 4 and 8 weeks decreased hepatic steatosis, but increased hepatic free fatty acids, cytochrome P4502E1, markers of lipid peroxidation/oxidant stress, lobular necroinflammation, and fibrosis. Progression of liver damage occurred despite reduced hepatic expression of tumor necrosis factor alpha, increased serum adiponectin, and striking improvement in systemic insulin sensitivity. CONCLUSION: Results from this mouse model would suggest accumulation of triglycerides may be a protective mechanism to prevent progressive liver damage in NAFLD.

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Published In

Hepatology

DOI

ISSN

0270-9139

Publication Date

June 2007

Volume

45

Issue

6

Start / End Page

1366 / 1374

Location

United States

Related Subject Headings

  • Tumor Necrosis Factor-alpha
  • Triglycerides
  • Oxidative Stress
  • Oligoribonucleotides, Antisense
  • Obesity
  • Mice, Mutant Strains
  • Mice
  • Methionine
  • Male
  • Liver Cirrhosis
 

Citation

APA
Chicago
ICMJE
MLA
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Yamaguchi, K., Yang, L., McCall, S., Huang, J., Yu, X. X., Pandey, S. K., … Diehl, A. M. (2007). Inhibiting triglyceride synthesis improves hepatic steatosis but exacerbates liver damage and fibrosis in obese mice with nonalcoholic steatohepatitis. Hepatology, 45(6), 1366–1374. https://doi.org/10.1002/hep.21655
Yamaguchi, Kanji, Liu Yang, Shannon McCall, Jiawen Huang, Xing Xian Yu, Sanjay K. Pandey, Sanjay Bhanot, Brett P. Monia, Yin-Xiong Li, and Anna Mae Diehl. “Inhibiting triglyceride synthesis improves hepatic steatosis but exacerbates liver damage and fibrosis in obese mice with nonalcoholic steatohepatitis.Hepatology 45, no. 6 (June 2007): 1366–74. https://doi.org/10.1002/hep.21655.
Yamaguchi K, Yang L, McCall S, Huang J, Yu XX, Pandey SK, et al. Inhibiting triglyceride synthesis improves hepatic steatosis but exacerbates liver damage and fibrosis in obese mice with nonalcoholic steatohepatitis. Hepatology. 2007 Jun;45(6):1366–74.
Yamaguchi, Kanji, et al. “Inhibiting triglyceride synthesis improves hepatic steatosis but exacerbates liver damage and fibrosis in obese mice with nonalcoholic steatohepatitis.Hepatology, vol. 45, no. 6, June 2007, pp. 1366–74. Pubmed, doi:10.1002/hep.21655.
Yamaguchi K, Yang L, McCall S, Huang J, Yu XX, Pandey SK, Bhanot S, Monia BP, Li Y-X, Diehl AM. Inhibiting triglyceride synthesis improves hepatic steatosis but exacerbates liver damage and fibrosis in obese mice with nonalcoholic steatohepatitis. Hepatology. 2007 Jun;45(6):1366–1374.
Journal cover image

Published In

Hepatology

DOI

ISSN

0270-9139

Publication Date

June 2007

Volume

45

Issue

6

Start / End Page

1366 / 1374

Location

United States

Related Subject Headings

  • Tumor Necrosis Factor-alpha
  • Triglycerides
  • Oxidative Stress
  • Oligoribonucleotides, Antisense
  • Obesity
  • Mice, Mutant Strains
  • Mice
  • Methionine
  • Male
  • Liver Cirrhosis