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Metabolic signature of HepaRG cells exposed to ethanol and tumor necrosis factor alpha to study alcoholic steatohepatitis by LC–MS-based untargeted metabolomics

  • oxicogenomics and Omics Technologies
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Abstract

Despite the high prevalence of alcoholic liver disease, its identification and characterization remain poor, especially in early stages such as alcoholic fatty liver disease and alcoholic steatohepatitis. This latter implies diagnostic difficulties, few therapeutic options and unclear mechanisms of action. To elucidate the metabolic alterations and pinpoint affected biochemical pathways, alcoholic steatohepatitis was simulated in vitro by exposing HepaRG cells to ethanol (IC10, 368 mM) and tumor necrosis factor alpha (TNF-α, 50 ng/mL) for 24 h. This combined exposure was compared to solely ethanol-exposed as well as -nonexposed cells. Four different metabolomics platforms were used combining liquid chromatography, high-resolution mass spectrometry and drift tube ion mobility to elucidate both intracellular and extracellular metabolic alterations. Some of the key findings include the influence of TNF-α in the upregulation of hepatic triglycerides and the downregulation of hepatic phosphatidylethanolamines and phosphatidylcholines. S-Adenosylmethionine showed to play a central role in the progression of alcoholic steatohepatitis. In addition, fatty acyl esters of hydroxy fatty acid (FAHFA)-containing triglycerides were detected for the first time in human hepatocytes and their alterations showed a potentially important role during the progression of alcoholic steatohepatitis. Ethoxylated phosphorylcholine was identified as a potential new biomarker of ethanol exposure.

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Data availability statement

Raw datafiles are available through the MassIVE repository (https://massive.ucsd.edu/ProteoSAFe/) with the data set identifier MSV000090773.

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Funding

Elias Iturrospe and Maria van de Lavoir acknowledge funding of the Research Scientific Foundation-Flanders (FWO)—project numbers 1161620N and 1120623N, respectively. Rani Robeyns and Katyeny Manuela da Silva were funded by the University of Antwerp (BOF-GOA—PS ID 41667 and BOF DOCPRO 4—Antigoon ID 36893, respectively). Further funding of this research has been provided by the University of Antwerp (UA, Belgium) and the Vrije Universiteit Brussel (VUB, Belgium).

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Contributions

EI: conceptualization, methodology, investigation, formal analysis, validation, visualization, writing—original draft, writing—review and editing. RR: methodology, investigation, writing—review and editing. KMdS: methodology, writing—review and editing. MvdL: methodology, writing—review and editing. JB: methodology, writing—review and editing. TV: supervision, conceptualization, writing—review and editing, resources. ALNvN: supervision, conceptualization, writing—review and editing, resources. AC: supervision, conceptualization, writing—review and editing, resources.

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Correspondence to Elias Iturrospe or Adrian Covaci.

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The authors have no competing interests to declare that are relevant to the content of this article.

Ethical approval

Ethical approval for the use of HepaRG cells was provided by the Medical Ethics Committee of the University Hospital Brussels (reference number 143201941214).

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Iturrospe, E., Robeyns, R., da Silva, K.M. et al. Metabolic signature of HepaRG cells exposed to ethanol and tumor necrosis factor alpha to study alcoholic steatohepatitis by LC–MS-based untargeted metabolomics. Arch Toxicol 97, 1335–1353 (2023). https://doi.org/10.1007/s00204-023-03470-y

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  • DOI: https://doi.org/10.1007/s00204-023-03470-y

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