Cited by 21Liver Disease Diagnosis and TreatmentDiet, Metabolism, and DiseaseMitochondrial Function and Pathology

Exploratory Data Analysis of Cell and Mitochondrial High-Fat, High-Sugar Toxicity on Human HepG2 Cells

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Amorim, Ricardo, Simões, Inês, Veloso, Caroline, Carvalho, Adriana, Simões, Rui, Pereira, Francisco, Thiel, Theresa, Normann, Andrea +5 more·2021·Nutrients

Abstract

Non-alcoholic steatohepatitis (NASH), one of the deleterious stages of non-alcoholic fatty liver disease, remains a significant cause of liver-related morbidity and mortality worldwide. In the current work, we used an exploratory data analysis to investigate time-dependent cellular and mitochondrial effects of different supra-physiological fatty acids (FA) overload strategies, in the presence or absence of fructose (F), on human hepatoma-derived HepG2 cells. We measured intracellular neutral lipid content and reactive oxygen species (ROS) levels, mitochondrial respiration and morphology, and caspases activity and cell death. FA-treatments induced a time-dependent increase in neutral lipid content, which was paralleled by an increase in ROS. Fructose, by itself, did not increase intracellular lipid content nor aggravated the effects of palmitic acid (PA) or free fatty acids mixture (FFA), although it led to an up-expression of hepatic fructokinase. Instead, F decreased mitochondrial phospholipid content, as well as OXPHOS subunits levels. Increased lipid accumulation and ROS in FA-treatments preceded mitochondrial dysfunction, comprising altered mitochondrial membrane potential (ΔΨm) and morphology, and decreased oxygen consumption rates, especially with PA. Consequently, supra-physiological PA alone or combined with F prompted the activation of caspase pathways leading to a time-dependent decrease in cell viability. Exploratory data analysis methods support this conclusion by clearly identifying the effects of FA treatments. In fact, unsupervised learning algorithms created homogeneous and cohesive clusters, with a clear separation between PA and FFA treated samples to identify a minimal subset of critical mitochondrial markers in order to attain a feasible model to predict cell death in NAFLD or for high throughput screening of possible therapeutic agents, with particular focus in measuring mitochondrial function.

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Crossref · 10.3390/nu13051723

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  • To induce steatosis in HepG2, supraphysiological concentrations of FFAs (0.5-2.0 mM) are often used.

    “Second, to induce steatosis, supraphysiological concentrations of FFAs (concentrations of 0.5–2.0 mM) are often used in HepG2 experiments [28,91,125,126,127,128,129,130].”

    From The HepG2 Cell Line as a Model for Studying Metabolic Dysfunction-Associated Steatotic Liver Disease (2026) · cites this paper as [91]

    Methods §2.3 and Results §3.1 report that the authors treated HepG2 cells with 0.5 mM palmitic acid and observed increased lipid accumulation, supporting an example at the low end of the cited range. The paper used 0.25 mM for its FFA mixture and does not establish that 0.5–2.0 mM is often used across HepG2 experiments. (LLM, conf=0.86)

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  • Fructose alone does not reliably induce de novo lipogenesis or triglyceride accumulation in HepG2, even at concentrations up to 20-25 mM and incubation times from 48 h to 28 days.

    “The limited reproducibility of fructose-induced DNL is a particularly significant limitation for MASLD studies, where sugar/fructose loading is considered one of the key pathogenic factors, as the ability of fructose to induce steatosis directly in HepG2 hepatoma cells remains controversial.”

    From The HepG2 Cell Line as a Model for Studying Metabolic Dysfunction-Associated Steatotic Liver Disease (2026) · cites this paper as [91]

    Results §3.1 reports that fructose alone did not increase intracellular lipid content in HepG2 cells, supporting the concern about direct fructose-induced steatosis. But Methods §2.3 tested 10 mM fructose for only 1, 6, and 24 hours; the paper does not establish the claim for 20–25 mM or 48 hours to 28 days, nor does it directly measure de novo lipogenesis. The Discussion says longer incubations should be studied to assess triglyceride accumulation. (LLM, conf=0.90)

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  • HepG2 is suitable for primary testing of intracellular TG and lipid droplet reduction, normalization of ER stress/ROS markers, restoration of mitochondrial function in lipotoxicity, and effects on transcriptional programs.

    “Thus, HepG2 is suitable for primary testing of intracellular TG and lipid droplet reduction, normalization of ER stress/ROS markers, restoration of mitochondrial function in lipotoxicity, and effects on transcriptional programs (lipogenesis, β-oxidation, inflammation) [80,91,92,93,94].”

    From The HepG2 Cell Line as a Model for Studying Metabolic Dysfunction-Associated Steatotic Liver Disease (2026) · cites this paper as [91]

    The Discussion (page not provided) calls HepG2 a suitable model for studying steatotic phenotypes and reports fatty-acid-induced lipid-droplet accumulation, increased ROS, and mitochondrial impairment. These findings support using it to assess lipid droplets, ROS, and mitochondrial function in lipotoxicity, but the paper does not establish the full proposed testing scope: intracellular TG reduction, normalization of ER-stress markers, or effects on transcriptional programs. (LLM, conf=0.86)

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Research works printed but not linked: 2

  1. [16]Zhang K. Chang Y. Shi Z. Han X. Han Y. Yao Q. Hu Z. Cui H. Zheng L. Han T. ω-3 PUFAs ameliorate liver fibrosis and inhibit hepatic stellate cells proliferation and acti-vation by promoting YAP/TAZ degradation Sci. Rep. 2016 6 1 14 27435808 PMC4951777
  2. [68]García-Ruiz I. Solís-Muñoz P. Fernández-Moreira D. Muñoz-Yagüe T. Solís-Herruzo J.A. In vitro treatment of HepG2 cells with saturated fatty acids reproduces mitochondrial dysfunction found in nonalcoholic steatohepatitis DMM Dis. Model Mech. 2015 8 183 191 25540128 PMC4314783

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Authors
Amorim, R., Simões, I., Veloso, C., Carvalho, A., Simões, R., Pereira, F., Thiel, T., Normann, A., Morais, C., Jurado, A., Wieckowski, M., Teixeira, J., & Oliveira, P.
Affiliations
  • Universidade do Porto (PT)
  • Instytut Biologii Doświadczalnej im. Marcelego Nenckiego (PL)
  • Biocant – Associação de Transferência de Tecnologia (PT)
  • Universidade Politécnica de Coimbra (PT)
  • Mediagnostic, D-72770 Reutlingen, Germany
  • Centro de Neurociências e Biologia Celular (PT)
Corresponding author
Oliveira, Paulo
Venue
Nutrients
Publisher
MDPI AG
Published
2021-05-19
Volume
13
Issue
5
Pages
1723
ISSN
2072-6643 (ISSN-L)
OpenAlex
W3161921875
Cited by
21
References
100
Citations by year
2026: 2 · 2025: 6 · 2024: 5 · 2023: 5 · 2022: 2 · 2021: 1
FWCI
2.34
Type
journal article
Language
en
Open access
Locations
  • Nutrients (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Estudo Geral (Universidad de Coimbra) (submittedVersion, cc-by)
  • Portuguese National Funding Agency for Science, Research and Technology (RCAAP Project by FCT) (submittedVersion, cc-by)
Funders
  • Fundação para a Ciência e Tecnologia (FCT) (PTDC/BTM-SAL/29297/2017, POCI-01-0145-FEDER-029297, PTDC/DTP-FTO/2433/2014, POCI-01-0145-FEDER-016659, PTDC/BIA-MOL/28607/2017, POCI-01-0145-FEDER-028607, POCI-01-0145-FEDER-006980, NORTE-01-0145-FEDER-000028, PTDC/ASP-HOR/29152/2017, POCI-01-0145-FEDER-0)
  • H2020 Marie Skłodowska-Curie Actions (722619, 734719)
  • Narodowe Centrum Nauki (UMO-2018/29/B/NZ1/00589)
Topics
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diet, Metabolism, and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
nonalcoholic steatohepatitis, non-alcoholic fatty liver disease, HepG2 cells, palmitic acid, free fatty acids, fructose, mitochondrial dysfunction, reactive oxygen species, lipid accumulation, mitochondrial membrane potential, mitochondrial morphology, oxygen consumption, caspase activation, cell death, fructokinase, mitochondrial phospholipids, high-fat high-sugar diet, cell viability, unsupervised learning, high-throughput screening
MeSH terms
Sugars, Data Analysis, Dietary Carbohydrates, Fatty Acids, Fatty Acids, Nonesterified, Fructose, Carcinoma, Hepatocellular, Humans, Liver, Liver Neoplasms, Mitochondria, Cell Death, Reactive Oxygen Species, Oxidative Stress, Palmitic Acid, Hepatocytes, Lipid Metabolism, Hep G2 Cells, Diet, High-Fat, Non-alcoholic Fatty Liver Disease

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