Cited by 174Metabolism and Genetic DisordersMitochondrial Function and PathologyAutophagy in Disease and Therapy

Absence of peroxisomes in mouse hepatocytes causes mitochondrial and ER abnormalities†

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Dirkx, Ruud, Vanhorebeek, Ilse, Martens, Katrin, Schad, Arno, Grabenbauer, Markus, Fahimi, Dariush, Declercq, Peter, Van Veldhoven, Paul P. +1 more·2005·Hepatology

Abstract

Peroxisome deficiency in men causes severe pathology in several organs, particularly in the brain and liver, but it is still unknown how metabolic abnormalities trigger these defects. In the present study, a mouse model with hepatocyte-selective elimination of peroxisomes was generated by inbreeding Pex5-loxP and albumin-Cre mice to investigate the consequences of peroxisome deletion on the functioning of hepatocytes. Besides the absence of catalase-positive peroxisomes, multiple ultrastructural alterations were noticed, including hepatocyte hypertrophy and hyperplasia, smooth endoplasmic reticulum proliferation, and accumulation of lipid droplets and lysosomes. Most prominent was the abnormal structure of the inner mitochondrial membrane, which bore some similarities with changes observed in Zellweger patients. This was accompanied by severely reduced activities of complex I, III, and V and a collapse of the mitochondrial inner membrane potential. Surprisingly, these abnormalities provoked no significant disturbances of adenosine triphosphate (ATP) levels and redox state of the liver. However, a compensatory increase of glycolysis as an alternative source of ATP and mitochondrial proliferation were observed. No evidence of oxidative damage to proteins or lipids nor elevation of oxidative stress defence mechanisms were found. Altered expression of peroxisome proliferator-activated receptor alpha (PPAR-alpha) regulated genes indicated that PPAR-alpha is activated in the peroxisome-deficient cells. In conclusion, the absence of peroxisomes from mouse hepatocytes has an impact on several other subcellular compartments and metabolic pathways but is not detrimental to the function of the liver parenchyma. Supplementary material for this article can be found on the HEPATOLOGY website (http://interscience.wiley.com/jpages/0270-9139/suppmat/index.html).

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Crossref · 10.1002/hep.20628

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  1. [1]1. Mannaerts GP, Van Veldhoven PP. Metabolic role of mammalian peroxi- somes. In: Gibson G, Lake B, eds. Peroxisomes: Biology and Importance in Toxicology and Medicine. London: Taylor & Francis, 1993:19-62.
  2. [21]21. Van Veldhoven PP, Just WW, Mannaerts GP. Permeability of the perox- isomal membrane to cofactors of ␤-oxidation. J Biol Chem 1987;262: 4310-4318.
  3. [43]43. Paradies G, Petrosillo G, Pistolese M, Di Venosa N, Federici A, Ruggiero FR. Decrease in mitochondrial complex I activity in ischemic/reperfused rat heart. Circ Res 2004;94:53-59.

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Authors
Dirkx, R., Vanhorebeek, I., Martens, K., Schad, A., Grabenbauer, M., Fahimi, D., Declercq, P., Van Veldhoven, P. P., & Baes, M.
Affiliations
  • KU Leuven (BE)
  • Heidelberg University (DE)
Corresponding author
Baes, Myriam
Venue
Hepatology
Published
2005-04
Volume
41
Issue
4
Pages
868-878
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2040365013
Cited by
174
References
49
Citations by year
2026: 2 · 2025: 6 · 2024: 3 · 2023: 11 · 2022: 8 · 2021: 10 · 2020: 13 · 2019: 8 · 2018: 13 · 2017: 7 · 2016: 11 · 2015: 11 · 2014: 10 · 2013: 11 · 2012: 10
FWCI
4.85
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
  • European Commission
  • Fonds Wetenschappelijk Onderzoek
  • Vlaamse regering
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
peroxisome deficiency, hepatocytes, PEX5, Zellweger syndrome, mitochondrial dysfunction, inner mitochondrial membrane, smooth endoplasmic reticulum, lipid droplets, lysosomes, hepatocyte hypertrophy, glycolysis, PPARα, ATP levels, oxidative stress
MeSH terms
Peroxisome-Targeting Signal 1 Receptor, Adenosine Triphosphate, Animals, Cells, Cultured, Disease Models, Animal, Endoplasmic Reticulum, Glucose, Liver, Mitochondria, Liver, Oxidation-Reduction, Zellweger Syndrome, Gene Expression, Receptors, Cytoplasmic and Nuclear, Mice, Knockout, Oxidative Stress, Peroxisomes, Hepatocytes, Mice

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