Defective hepatic mitochondrial respiratory chain in patients with nonalcoholic steatohepatitis.
Open accessAbstract
Mitochondrial dysfunction might play a central role in the pathogenesis of nonalcoholic steatohepatitis (NASH). The aims of this study were to evaluate whether free fatty acid (FFA) transport into the mitochondria or the activity of mitochondria respiratory chain (MRC) complexes are impaired in NASH. In patients with NASH and control subjects, we measured free carnitine, short-chain acylcarnitine (SCAC) and long-chain acylcarnitine (LCAC) esters, carnitine palmitoyltransferase (CPT) activity, and MRC enzyme activity in liver tissue as well as serum concentration of tumor necrosis factor alpha (TNF-alpha), homeostatic metabolic assessment of insulin resistance (HOMA(IR)), and body mass index (BMI). In patients with NASH, the LCAC/free carnitine ratio was significantly increased and the SCAC/free carnitine ratio was decreased. In patients with NASH, the activity of the MRC complexes was decreased to 63% +/- 20% (complex I), 58.5% +/- 16.7% (complex II), 70.6% +/- 10.3% (complex III), 62.5% +/- 13% (complex IV), and 42.4% +/- 9.1% (adenosine triphosphate synthase) of the corresponding control values. Activity of these complexes correlated significantly with serum TNF-alpha and HOMA(IR). Serum TNF-alpha (36.3 +/- 23.1 pg/mL), HOMA(IR) (4.5 +/- 2.38), and BMI (29.9 +/- 3.5 kg/m(2)) values were significantly increased in patients with NASH. In conclusion, activities of MRC complexes were decreased in liver tissue of patients with NASH. This dysfunction correlated with serum TNF-alpha, insulin resistance, and BMI values.
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People with NAFLD have decreased electron transport chain complex activity.
“Patients with NAFLD present with decreased ETC complex activity153,154 and a fatty liver-associated decrease in SIRT3 activity, which leads to hyperacetylation of mitochondrial proteins and mitochondrial dysfunction155.”
From Mitochondrial and metabolic dysfunction in ageing and age-related diseases (2022) · cites this paper as [154]
Enzymatic activity of complexes I-V is reduced in liver extracts from patients with NASH and is inversely correlated with BMI and HOMA-IR.
“Indeed, enzymatic activity of complexes I-V is reduced in liver extracts from patients with NASH and is inversely correlated with BMI and HOMA-IR (233, 234).”
From The role of mitochondria in the pathogenesis of type 2 diabetes (2010) · cites this paper as [233]
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Retracted
- Authors
- Pérez-Carreras, M., Del Hoyo, P., Martín, M. A., Rubio, J. C., Martín, A., Castellano, G., Colina, F., Arenas, J., & Solis-Herruzo, J. A.
- Corresponding author
- Pérez-Carreras, Mercedes
- Venue
- Hepatology
- Published
- 2003-10
- Volume
- 38
- Issue
- 4
- Pages
- 999-1007
- ISSN
- 0270-9139 (ISSN-L)
- OpenAlex
- W2084382398
- Cited by
- 734
- References
- 49
- Citations by year
- 2026: 13 · 2025: 28 · 2024: 39 · 2023: 43 · 2022: 42 · 2021: 38 · 2020: 40 · 2019: 36 · 2018: 40 · 2017: 35 · 2016: 38 · 2015: 32 · 2014: 36 · 2013: 21 · 2012: 37
- FWCI
- 13.56
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Hepatology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
- Keywords
- nonalcoholic steatohepatitis, mitochondrial respiratory chain, mitochondrial dysfunction, free fatty acid transport, acylcarnitines, free carnitine, carnitine palmitoyltransferase, TNF-α, insulin resistance, obesity, liver mitochondria
- MeSH terms
- Adult, Carnitine, Electron Transport, Fatty Acids, Fatty Liver, Female, Humans, Insulin Resistance, Male, Middle Aged, Mitochondria, Liver, Oxidation-Reduction, Body Mass Index, Reactive Oxygen Species
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