Cited by 281Liver Disease Diagnosis and TreatmentLiver physiology and pathologyTGF-β signaling in diseases

Transforming Growth Factor Beta Signaling in Hepatocytes Participates in Steatohepatitis Through Regulation of Cell Death and Lipid Metabolism in Mice

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Yang, Ling, Roh, Yoon Seok, Song, Jingyi, Zhang, Bi, Liu, Cheng, Loomba, Rohit, Seki, Ekihiro·2014·Hepatology

Abstract

Transforming growth factor beta (TGF-β) signaling activates Smad- and TGF-β-activated kinase 1 (TAK1)-dependent signaling to regulate cell survival, proliferation, fibrosis, and tumorigenesis. The effects of TGF-β signaling on metabolic syndrome, including nonalcoholic fatty liver disease, remain elusive. Wild-type (WT) and hepatocyte-specific TGF-β receptor type II-deficient ( Tgfbr2ΔHEP ) mice were fed a choline-deficient amino acid (CDAA)-defined diet for 22 weeks to induce NASH. WT mice fed a CDAA diet displayed increased activation of Smad2/3 and had marked lipid accumulation, inflammatory cell infiltration, hepatocyte death, and fibrosis; in comparison, Tgfbr2ΔHEP mice fed a CDAA diet had suppressed liver steatosis, inflammation, and fibrosis. Both palmitate-induced steatotic hepatocytes and hepatocytes isolated from WT mice fed a CDAA diet had increased susceptibility to TGF-β-mediated death. TGF-β-mediated death in steatotic hepatocytes was inhibited by silencing Smad2 or blocking reactive oxygen species (ROS) production and was enhanced by inhibiting TAK1 or nuclear factor kappa B. Increased hepatic steatosis in WT mice fed a CDAA diet was associated with the increased expression of lipogenesis genes ( Dgat1 and Srebp1c ), whereas the decreased steatosis in Tgfbr2ΔHEP mice was accompanied by the increased expression of genes involved in β-oxidation ( Cpt1 and Acox1 ). In combination with palmitate treatment, TGF-β signaling promoted lipid accumulation with induction of lipogenesis-related genes and suppression of β-oxidation-related genes in hepatocytes. Silencing Smad2 decreased TGF-β-mediated lipid accumulation and corrected altered gene expression related to lipid metabolism in hepatocytes. Finally, we confirmed that livers from patients with nonalcoholic steatohepatitis (NASH) displayed phosphorylation and nuclear translocation of Smad2/3. Conclusions : TGF-β signaling in hepatocytes contributes to hepatocyte death and lipid accumulation through Smad signaling and ROS production that promote the development of NASH. (Hepatology 2014;59:483–495)

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Authors
Yang, L., Roh, Y. S., Song, J., Zhang, B., Liu, C., Loomba, R., & Seki, E.
Affiliations
University of California San Diego (US)
Corresponding author
Seki, Ekihiro
Venue
Hepatology
Published
2014-02
Volume
59
Issue
2
Pages
483-495
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2096947328
Cited by
275
References
40
Citations by year
2026: 20 · 2025: 22 · 2024: 16 · 2023: 19 · 2022: 33 · 2021: 27 · 2020: 21 · 2019: 32 · 2018: 26 · 2017: 17 · 2016: 15 · 2015: 11 · 2014: 15 · 2012: 1
FWCI
9.98
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • John A. Hartford Foundation (R01DK085252, K23-DK090303)
  • Hartford Foundation for Public Giving
  • American Gastroenterological Association (R01DK085252, K23DK090303, P30CA23100-27)
  • National Natural Science Foundation of China (R01DK085252, 30500658, 81370550)
  • National Institutes of Health (R01AA02172)
  • National Institute on Alcohol Abuse and Alcoholism (R01AA020172)
  • National Cancer Institute (P30CA023100)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K23DK090303, R01DK085252)
  • National Institute of Environmental Health Sciences (P42ES010337)
Topics
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
Keywords
TGF-beta signaling, nonalcoholic steatohepatitis, hepatocyte death, lipid accumulation, Smad2/3, TGFBR2, TAK1, reactive oxygen species, NF-κB, lipogenesis, fatty acid beta-oxidation, hepatocyte-specific knockout mice, liver fibrosis, liver inflammation
MeSH terms
Receptor, Transforming Growth Factor-beta Type II, Animals, Cells, Cultured, Choline Deficiency, Disease Models, Animal, Fatty Liver, Male, Mice, Inbred C57BL, Mice, Transgenic, Signal Transduction, Transforming Growth Factor beta, Apoptosis, Protein Serine-Threonine Kinases, Gene Deletion, Reactive Oxygen Species, Receptors, Transforming Growth Factor beta, Disease Progression, Hepatocytes, Lipid Metabolism, Mice, Smad Proteins

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