Abnormal lipid processing but normal long-term repopulation potential of myc-/- hepatocytes

Lia R. Edmunds, P. Anthony Otero, Lokendra Sharma, Sonia D'Souza, James M. Dolezal, Sherin David, Jie Lu, Lauren Lamm, Mahesh Basantani, Pili Zhang, Ian J. Sipula, Lucy Li, Xuemei Zeng, Ying Ding, Fei Ding, Megan E. Beck, Jerry Vockley, Satdarshan P.S. Monga, Erin E. Kershaw, Robert M. O'DohertyLisa E. Kratz, Nathan A. Yates, Eric P. Goetzman, Donald Scott, Andrew W. Duncan, Edward V. Prochownik

Research output: Contribution to journalArticle

Abstract

Establishing c-Myc's (Myc) role in liver regeneration has proven difficult particularly since the traditional model of partial hepatectomy may provoke an insufficiently demanding proliferative stress. We used a model of hereditary tyrosinemia whereby the affected parenchyma can be gradually replaced by transplanted hepatocytes, which replicate 50-100-fold, over several months. Prior to transplantation, livers from myc-/- (KO) mice were smaller in young animals and larger in older animals relative to myc+/+ (WT) counterparts. KO mice also consumed more oxygen, produced more CO2 and generated more heat. Although WT and KO hepatocytes showed few mitochondrial structural differences, the latter demonstrated defective electron transport chain function. RNAseq revealed differences in transcripts encoding ribosomal subunits, cytochrome p450 members and enzymes for triglyceride and sterol biosynthesis. KO hepatocytes also accumulated neutral lipids. WT and KO hepatocytes repopulated recipient tyrosinemic livers equally well although the latter were associated with a pro-inflammatory hepatic environment that correlated with worsening lipid accumulation, its extracellular deposition and parenchymal oxidative damage. Our results show Myc to be dispensable for sustained in vivo hepatocyte proliferation but necessary for maintaining normal lipid homeostasis. myc-/- livers resemble those encountered in non-alcoholic fatty liver disease and, under sustained proliferative stress, gradually acquire the features of non-alcoholic steatohepatitis.

Original languageEnglish (US)
Pages (from-to)30379-30395
Number of pages17
JournalOncotarget
Volume7
Issue number21
DOIs
StatePublished - May 24 2016

Keywords

  • Cytochrome p450
  • Electron transport chain
  • Hereditary tyrosinemia
  • NAFLD
  • NASH

ASJC Scopus subject areas

  • Oncology

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  • Cite this

    Edmunds, L. R., Otero, P. A., Sharma, L., D'Souza, S., Dolezal, J. M., David, S., Lu, J., Lamm, L., Basantani, M., Zhang, P., Sipula, I. J., Li, L., Zeng, X., Ding, Y., Ding, F., Beck, M. E., Vockley, J., Monga, S. P. S., Kershaw, E. E., ... Prochownik, E. V. (2016). Abnormal lipid processing but normal long-term repopulation potential of myc-/- hepatocytes. Oncotarget, 7(21), 30379-30395. https://doi.org/10.18632/oncotarget.8856