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Costa CF, Lismont C, Chornyi S, Koster J, Li H, Hussein MAF, Van Veldhoven PP, Waterham HR, Fransen M. The solute carrier SLC25A17 sustains peroxisomal redox homeostasis in diverse mammalian cell lines. Free Radic Biol Med 2024; 212:241-254. [PMID: 38159891 DOI: 10.1016/j.freeradbiomed.2023.12.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 12/01/2023] [Accepted: 12/24/2023] [Indexed: 01/03/2024]
Abstract
Despite the crucial role of peroxisomes in cellular redox maintenance, little is known about how these organelles transport redox metabolites across their membrane. In this study, we sought to assess potential associations between the cellular redox landscape and the human peroxisomal solute carrier SLC25A17, also known as PMP34. This carrier has been reported to function as a counter-exchanger of adenine-containing cofactors such as coenzyme A (CoA), dephospho-CoA, flavin adenine dinucleotide, nicotinamide adenine dinucleotide (NAD+), adenosine 3',5'-diphosphate, flavin mononucleotide, and adenosine monophosphate. We found that inactivation of SLC25A17 resulted in a shift toward a more reductive state in the glutathione redox couple (GSSG/GSH) across HEK-293 cells, HeLa cells, and SV40-transformed mouse embryonic fibroblasts, with variable impact on the NADPH levels and the NAD+/NADH redox couple. This phenotype could be rescued by the expression of Candida boidinii Pmp47, a putative SLC25A17 orthologue reported to be essential for the metabolism of medium-chain fatty acids in yeast peroxisomes. In addition, we provide evidence that the alterations in the redox state are not caused by changes in peroxisomal antioxidant enzyme expression, catalase activity, H2O2 membrane permeability, or mitochondrial fitness. Furthermore, treating control and ΔSLC25A17 cells with dehydroepiandrosterone, a commonly used glucose-6-phosphate dehydrogenase inhibitor affecting NADPH regeneration, revealed a kinetic disconnection between the peroxisomal and cytosolic glutathione pools. Additionally, these experiments underscored the impact of SLC25A17 loss on peroxisomal NADPH metabolism. The relevance of these findings is discussed in the context of the still ambiguous substrate specificity of SLC25A17 and the recent observation that the mammalian peroxisomal membrane is readily permeable to both GSH and GSSG.
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Affiliation(s)
- Cláudio F Costa
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000, Leuven, Belgium
| | - Celien Lismont
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000, Leuven, Belgium
| | - Serhii Chornyi
- Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry, Amsterdam University Medical Centers, University of Amsterdam, 1105 AZ, Amsterdam, the Netherlands
| | - Janet Koster
- Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry, Amsterdam University Medical Centers, University of Amsterdam, 1105 AZ, Amsterdam, the Netherlands
| | - Hongli Li
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000, Leuven, Belgium
| | - Mohamed A F Hussein
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000, Leuven, Belgium; Department of Biochemistry, Faculty of Pharmacy, Assiut University, 71515, Asyut, Egypt
| | - Paul P Van Veldhoven
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000, Leuven, Belgium
| | - Hans R Waterham
- Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry, Amsterdam University Medical Centers, University of Amsterdam, 1105 AZ, Amsterdam, the Netherlands
| | - Marc Fransen
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000, Leuven, Belgium.
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Swinkels D, Kocherlakota S, Das Y, Dane AD, Wever EJM, Vaz FM, Bazan NG, Van Veldhoven PP, Baes M. DHA Shortage Causes the Early Degeneration of Photoreceptors and RPE in Mice With Peroxisomal β-Oxidation Deficiency. Invest Ophthalmol Vis Sci 2023; 64:10. [PMID: 37934161 PMCID: PMC10631513 DOI: 10.1167/iovs.64.14.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 09/06/2023] [Indexed: 11/08/2023] Open
Abstract
Purpose Patients deficient in peroxisomal β-oxidation, which is essential for the synthesis of docosahexaenoic acid (DHA, C22:6n-3) and breakdown of very-long-chain polyunsaturated fatty acids (VLC-PUFAs), both important components of photoreceptor outer segments, develop retinopathy present with retinopathy. The representative mouse model lacking the central enzyme of this pathway, multifunctional protein 2 (Mfp2-/-), also show early-onset retinal decay and cell-autonomous retinal pigment epithelium (RPE) degeneration, accompanied by reduced plasma and retinal DHA levels. In this study, we investigated whether DHA supplementation can rescue the retinal degeneration of Mfp2-/- mice. Methods Mfp2+/- breeding pairs and their offspring were fed a 0.12% DHA or control diet during gestation and lactation and until sacrifice. Offspring were analyzed for retinal function via electroretinograms and for lipid composition of neural retina and plasma with lipidome analysis and gas chromatography, respectively, and histologically using retinal sections and RPE flatmounts at the ages of 4, 8, and 16 weeks. Results DHA supplementation to Mfp2-/- mice restored retinal DHA levels and prevented photoreceptor shortening, death, and impaired functioning until 8 weeks. In addition, rescue of retinal DHA levels temporarily improved the ability of the RPE to phagocytose outer segments and delayed the RPE dedifferentiation. However, despite the initial rescue of retinal integrity, DHA supplementation could not prevent retinal degeneration at 16 weeks. Conclusions We reveal that the shortage of a systemic supply of DHA is pivotal for the early retinal degeneration in Mfp2-/- mice. Furthermore, we report that adequate retinal DHA levels are essential not only for photoreceptors but also for RPE homeostasis.
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Affiliation(s)
- Daniëlle Swinkels
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Sai Kocherlakota
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Yannick Das
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Adriaan D. Dane
- Department of Epidemiology and Data Science, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Core Facility Metabolomics, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Department of Clinical Chemistry and Pediatrics, Laboratory Genetic Metabolic Diseases, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Eric J. M. Wever
- Department of Epidemiology and Data Science, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Core Facility Metabolomics, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Department of Clinical Chemistry and Pediatrics, Laboratory Genetic Metabolic Diseases, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Frédéric M. Vaz
- Core Facility Metabolomics, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Department of Clinical Chemistry and Pediatrics, Laboratory Genetic Metabolic Diseases, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Inborn Errors of Metabolism, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, The Netherlands
| | - Nicolas G. Bazan
- Neuroscience Center of Excellence, Louisiana State University School of Medicine, Louisiana State University, New Orleans, Louisiana, United States
| | - Paul P. Van Veldhoven
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
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3
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Kocherlakota S, Das Y, Swinkels D, Vanmunster M, Callens M, Vinckier S, Vaz FM, Sinha D, Van Veldhoven PP, Fransen M, Baes M. The murine retinal pigment epithelium requires peroxisomal β-oxidation to maintain lysosomal function and prevent dedifferentiation. Proc Natl Acad Sci U S A 2023; 120:e2301733120. [PMID: 37862382 PMCID: PMC10614831 DOI: 10.1073/pnas.2301733120] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 08/14/2023] [Indexed: 10/22/2023] Open
Abstract
Retinal pigment epithelium (RPE) cells have to phagocytose shed photoreceptor outer segments (POS) on a daily basis over the lifetime of an organism, but the mechanisms involved in the digestion and recycling of POS lipids are poorly understood. Although it was frequently assumed that peroxisomes may play an essential role, this was never investigated. Here, we show that global as well as RPE-selective loss of peroxisomal β-oxidation in multifunctional protein 2 (MFP2) knockout mice impairs the digestive function of lysosomes in the RPE at a very early age, followed by RPE degeneration. This was accompanied by prolonged mammalian target of rapamycin activation, lipid deregulation, and mitochondrial structural anomalies without, however, causing oxidative stress or energy shortage. The RPE degeneration caused secondary photoreceptor death. Notably, the deterioration of the RPE did not occur in an Mfp2/rd1 mutant mouse line, characterized by absent POS shedding. Our findings prove that peroxisomal β-oxidation in the RPE is essential for handling the polyunsaturated fatty acids present in ingested POS and shed light on retinopathy in patients with peroxisomal disorders. Our data also have implications for gene therapy development as they highlight the importance of targeting the RPE in addition to the photoreceptor cells.
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Affiliation(s)
- Sai Kocherlakota
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Yannick Das
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Daniëlle Swinkels
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Maarten Vanmunster
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Manon Callens
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Stefan Vinckier
- Laboratory of Angiogenesis and Vascular Metabolism, Center for Cancer Biology, Vlaams Insituut voor Biotechnologie, Leuven3000, Belgium
- Department of Oncology, Leuven Cancer Institute, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Frédéric M. Vaz
- Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry, Amsterdam Gastroenterology and Metabolism, Amsterdam University Medical Center, University of Amsterdam, Amsterdam1105AZ, The Netherlands
- Core Facility Metabolomics, Amsterdam University Medical Center, Amsterdam1105AZ, The Netherlands
| | - Debasish Sinha
- Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA15213
- Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore, MD21287
| | - Paul P. Van Veldhoven
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Marc Fransen
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, Leuven3000, Belgium
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Katholieke Universiteit Leuven, Leuven3000, Belgium
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Kocherlakota S, Swinkels D, Van Veldhoven PP, Baes M. Mouse Models to Study Peroxisomal Functions and Disorders: Overview, Caveats, and Recommendations. Methods Mol Biol 2023; 2643:469-500. [PMID: 36952207 DOI: 10.1007/978-1-0716-3048-8_34] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
During the last three decades many mouse lines were created or identified that are deficient in one or more peroxisomal functions. Different methodologies were applied to obtain global, hypomorph, cell type selective, inducible, and knockin mice. Whereas some models closely mimic pathologies in patients, others strongly deviate or no human counterpart has been reported. Often, mice, apparently endowed with a stronger transcriptional adaptation, have to be challenged with dietary additions or restrictions in order to trigger phenotypic changes. Depending on the inactivated peroxisomal protein, several approaches can be taken to validate the loss-of-function. Here, an overview is given of the available mouse models and their most important characteristics.
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Affiliation(s)
- Sai Kocherlakota
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Daniëlle Swinkels
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium.
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5
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Lismont C, Revenco I, Costa CF, Li H, Hussein MAF, Van Veldhoven PP, Derua R, Fransen M. Identification of Peroxisome-Derived Hydrogen Peroxide-Sensitive Target Proteins Using a YAP1C-Based Genetic Probe. Methods Mol Biol 2023; 2643:161-181. [PMID: 36952185 DOI: 10.1007/978-1-0716-3048-8_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
As the reversible oxidation of protein cysteine thiols is an important mechanism in signal transduction, it is essential to have access to experimental approaches that allow for spatiotemporal indexing of the cellular sulfenome in response to local changes in H2O2 levels. Here, we provide a step-by-step guide for enriching and identifying the sulfenome of mammalian cells at the subcellular level in response to peroxisome-derived H2O2 by the combined use of (i) a previously developed cell line in which peroxisomal H2O2 production can be induced in a time- and dose-dependent manner; (ii) YAP1C, a genetically encoded yeast AP-1-like transcription factor-based probe that specifically reacts with S-sulfenylated cysteines and traps them through mixed disulfide bonds; and (iii) mass spectrometry. Given that this approach includes differential labeling of reduced and reversibly oxidized cysteine residues, it can also provide additional information on the positions of the modified cysteines. Gaining more in-depth insight into the complex nature of how alterations in peroxisomal H2O2 metabolism modulate the cellular sulfenome is key to our understanding of how these organelles act as redox signaling hubs in health and disease.
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Affiliation(s)
- Celien Lismont
- Department of Cellular and Molecular Medicine, Laboratory of Peroxisome Biology and Intracellular Communication, KU Leuven, Leuven, Belgium.
| | - Iulia Revenco
- Department of Cellular and Molecular Medicine, Laboratory of Peroxisome Biology and Intracellular Communication, KU Leuven, Leuven, Belgium
| | - Cláudio F Costa
- Department of Cellular and Molecular Medicine, Laboratory of Peroxisome Biology and Intracellular Communication, KU Leuven, Leuven, Belgium
| | - Hongli Li
- Department of Cellular and Molecular Medicine, Laboratory of Peroxisome Biology and Intracellular Communication, KU Leuven, Leuven, Belgium
| | - Mohamed A F Hussein
- Department of Cellular and Molecular Medicine, Laboratory of Peroxisome Biology and Intracellular Communication, KU Leuven, Leuven, Belgium
| | - Paul P Van Veldhoven
- Department of Cellular and Molecular Medicine, Laboratory of Peroxisome Biology and Intracellular Communication, KU Leuven, Leuven, Belgium
| | - Rita Derua
- Department of Cellular and Molecular Medicine, Laboratory of Protein Phosphorylation and Proteomics, KU Leuven, Leuven, Belgium
- SyBioMa, KU Leuven, Leuven, Belgium
| | - Marc Fransen
- Department of Cellular and Molecular Medicine, Laboratory of Peroxisome Biology and Intracellular Communication, KU Leuven, Leuven, Belgium
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Paul F, Ng C, Mohamad Sahari UB, Nafissi S, Nilipoor Y, Tavasoli AR, Bonnard C, Wong PM, Nabavizadeh N, Altunoğlu U, Estiar MA, Majoie CB, Lee H, Nelson SF, Gan-Or Z, Rouleau GA, Van Veldhoven PP, Massie R, Hennekam RC, Kariminejad A, Reversade B. RABENOSYN separation-of-function mutations uncouple endosomal recycling from lysosomal degradation, causing a distinct Mendelian Disorder. Hum Mol Genet 2022; 31:3729-3740. [PMID: 35652444 DOI: 10.1093/hmg/ddac120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/12/2022] [Accepted: 05/19/2022] [Indexed: 11/14/2022] Open
Abstract
Rabenosyn (RBSN) is a conserved endosomal protein necessary for regulating internalized cargo. Here, we present clinical, genetic, cellular and biochemical evidence that two distinct RBSN missense variants are responsible for a novel Mendelian disorder consisting of progressive muscle weakness, facial dysmorphisms, ophthalmoplegia and intellectual disability. Using exome sequencing, we identified recessively-acting germline alleles p.Arg180Gly and p.Gly183Arg which are both situated in the FYVE domain of RBSN. We find that these variants abrogate binding to its cognate substrate PI3P and thus prevent its translocation to early endosomes. Although the endosomal recycling pathway was unaltered, mutant p.Gly183Arg patient fibroblasts exhibit accumulation of cargo tagged for lysosomal degradation. Our results suggest that these variants are separation-of-function alleles, which cause a delay in endosomal maturation without affecting cargo recycling. We conclude that distinct germline mutations in RBSN cause non-overlapping phenotypes with specific and discrete endolysosomal cellular defects.
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Affiliation(s)
- Franziska Paul
- Laboratory of Human Genetics & Therapeutics, Institute of Molecular and Cell Biology (IMCB), A*STAR, Singapore
| | - Calista Ng
- Laboratory of Human Genetics & Therapeutics, Genome Institute of Singapore (GIS), A*STAR, Singapore
| | - Umar Bin Mohamad Sahari
- Laboratory of Human Genetics & Therapeutics, Genome Institute of Singapore (GIS), A*STAR, Singapore
| | - Shahriar Nafissi
- Department of Neurology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Yalda Nilipoor
- Pediatric Pathology Research Centre, Research Institute for Children Health, Shahid Beheshti Medical University, Tehran, Iran
| | - Ali Reza Tavasoli
- Myelin Disorders Clinic, Pediatric Neurology Division, Children's Medical Center, Tehran University Of Medical Sciences, Tehran, Iran
| | - Carine Bonnard
- Model Development, A*STAR Skin Research Labs (ASRL), Singapore
| | - Pui-Mun Wong
- Laboratory of Human Genetics & Therapeutics, Genome Institute of Singapore (GIS), A*STAR, Singapore
| | - Nasrinsadat Nabavizadeh
- Laboratory of Human Genetics & Therapeutics, Genome Institute of Singapore (GIS), A*STAR, Singapore
- Department of Cell and Molecular Biology & Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
- Department of Medical Genetics, Koç University School of Medicine, Istanbul, Turkey
| | - Umut Altunoğlu
- Department of Medical Genetics, Koç University School of Medicine, Istanbul, Turkey
| | - Mehrdad A Estiar
- Department of Human Genetics, McGill University, Montréal, Québec, Canada
- The Neuro (Montreal Neurological Institute-Hospital), McGill University, Montréal, Québec, Canada
| | - Charles B Majoie
- Department of Radiology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Hane Lee
- 3billion Inc., Seoul, South Korea
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Stanley F Nelson
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Ziv Gan-Or
- Department of Human Genetics, McGill University, Montréal, Québec, Canada
- The Neuro (Montreal Neurological Institute-Hospital), McGill University, Montréal, Québec, Canada
- Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada
| | - Guy A Rouleau
- Department of Human Genetics, McGill University, Montréal, Québec, Canada
- The Neuro (Montreal Neurological Institute-Hospital), McGill University, Montréal, Québec, Canada
- Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions (LIPIT), Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Rami Massie
- The Neuro (Montreal Neurological Institute-Hospital), McGill University, Montréal, Québec, Canada
- Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada
| | - Raoul C Hennekam
- Department of Pediatrics, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | | | - Bruno Reversade
- Laboratory of Human Genetics & Therapeutics, Institute of Molecular and Cell Biology (IMCB), A*STAR, Singapore
- Laboratory of Human Genetics & Therapeutics, Genome Institute of Singapore (GIS), A*STAR, Singapore
- Department of Medical Genetics, Koç University School of Medicine, Istanbul, Turkey
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7
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Lismont C, Revenco I, Li H, Costa CF, Lenaerts L, Hussein MAF, De Bie J, Knoops B, Van Veldhoven PP, Derua R, Fransen M. Peroxisome-Derived Hydrogen Peroxide Modulates the Sulfenylation Profiles of Key Redox Signaling Proteins in Flp-In T-REx 293 Cells. Front Cell Dev Biol 2022; 10:888873. [PMID: 35557958 PMCID: PMC9086853 DOI: 10.3389/fcell.2022.888873] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 03/31/2022] [Indexed: 12/12/2022] Open
Abstract
The involvement of peroxisomes in cellular hydrogen peroxide (H2O2) metabolism has been a central theme since their first biochemical characterization by Christian de Duve in 1965. While the role of H2O2 substantially changed from an exclusively toxic molecule to a signaling messenger, the regulatory role of peroxisomes in these signaling events is still largely underappreciated. This is mainly because the number of known protein targets of peroxisome-derived H2O2 is rather limited and testing of specific targets is predominantly based on knowledge previously gathered in related fields of research. To gain a broader and more systematic insight into the role of peroxisomes in redox signaling, new approaches are urgently needed. In this study, we have combined a previously developed Flp-In T-REx 293 cell system in which peroxisomal H2O2 production can be modulated with a yeast AP-1-like-based sulfenome mining strategy to inventory protein thiol targets of peroxisome-derived H2O2 in different subcellular compartments. By using this approach, we identified more than 400 targets of peroxisome-derived H2O2 in peroxisomes, the cytosol, and mitochondria. We also observed that the sulfenylation kinetics profiles of key targets belonging to different protein families (e.g., peroxiredoxins, annexins, and tubulins) can vary considerably. In addition, we obtained compelling but indirect evidence that peroxisome-derived H2O2 may oxidize at least some of its targets (e.g., transcription factors) through a redox relay mechanism. In conclusion, given that sulfenic acids function as key intermediates in H2O2 signaling, the findings presented in this study provide valuable insight into how peroxisomes may be integrated into the cellular H2O2 signaling network.
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Affiliation(s)
- Celien Lismont
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Iulia Revenco
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Hongli Li
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Cláudio F Costa
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Lisa Lenaerts
- Laboratory of Protein Phosphorylation and Proteomics, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Mohamed A F Hussein
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Jonas De Bie
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Bernard Knoops
- Group of Animal Molecular and Cellular Biology, Institute of Biomolecular Science and Technology (LIBST), Université Catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Rita Derua
- Laboratory of Protein Phosphorylation and Proteomics, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.,SyBioMa, KU Leuven, Leuven, Belgium
| | - Marc Fransen
- Laboratory of Peroxisome Biology and Intracellular Communication, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
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Goossens C, Weckx R, Derde S, Vander Perre S, Derese I, Van Veldhoven PP, Ghesquière B, Van den Berghe G, Langouche L. Altered cholesterol homeostasis in critical illness-induced muscle weakness: effect of exogenous 3-hydroxybutyrate. Crit Care 2021; 25:252. [PMID: 34274000 PMCID: PMC8285799 DOI: 10.1186/s13054-021-03688-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 07/08/2021] [Indexed: 11/16/2022]
Abstract
Background Muscle weakness is a complication of critical illness which hampers recovery. In critically ill mice, supplementation with the ketone body 3-hydroxybutyrate has been shown to improve muscle force and to normalize illness-induced hypocholesterolemia. We hypothesized that altered cholesterol homeostasis is involved in development of critical illness-induced muscle weakness and that this pathway can be affected by 3-hydroxybutyrate. Methods In both human critically ill patients and septic mice, the association between circulating cholesterol concentrations and muscle weakness was assessed. In septic mice, the impact of 3-hydroxybutyrate supplementation on cholesterol homeostasis was evaluated with use of tracer technology and through analysis of markers of cholesterol metabolism and downstream pathways. Results Serum cholesterol concentrations were lower in weak than in non-weak critically ill patients, and in multivariable analysis adjusting for baseline risk factors, serum cholesterol was inversely correlated with weakness. In septic mice, plasma cholesterol correlated positively with muscle force. In septic mice, exogenous 3-hydroxybutyrate increased plasma cholesterol and altered cholesterol homeostasis, by normalization of plasma mevalonate and elevation of muscular, but not hepatic, expression of cholesterol synthesis genes. In septic mice, tracer technology revealed that 3-hydroxybutyrate was preferentially taken up by muscle and metabolized into cholesterol precursor mevalonate, rather than TCA metabolites. The 3-hydroxybutyrate protection against weakness was not related to ubiquinone or downstream myofiber mitochondrial function, whereas cholesterol content in myofibers was increased. Conclusions These findings point to a role for low cholesterol in critical illness-induced muscle weakness and to a protective mechanism-of-action for 3-hydroxybutyrate supplementation. Supplementary Information The online version contains supplementary material available at 10.1186/s13054-021-03688-1.
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Affiliation(s)
- Chloë Goossens
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49 bus 503, 3000, Leuven, Belgium
| | - Ruben Weckx
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49 bus 503, 3000, Leuven, Belgium
| | - Sarah Derde
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49 bus 503, 3000, Leuven, Belgium
| | - Sarah Vander Perre
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49 bus 503, 3000, Leuven, Belgium
| | - Inge Derese
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49 bus 503, 3000, Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory for Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Bart Ghesquière
- Metabolomics Expertise Center, Center for Cancer Biology, VIB, KU Leuven, 3000, Leuven, Belgium
| | - Greet Van den Berghe
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49 bus 503, 3000, Leuven, Belgium
| | - Lies Langouche
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49 bus 503, 3000, Leuven, Belgium.
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9
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Ebenezer DL, Ramchandran R, Fu P, Mangio LA, Suryadevara V, Ha AW, Berdyshev E, Van Veldhoven PP, Kron SJ, Schumacher F, Kleuser B, Natarajan V. Nuclear Sphingosine-1-phosphate Lyase Generated ∆2-hexadecenal is A Regulator of HDAC Activity and Chromatin Remodeling in Lung Epithelial Cells. Cell Biochem Biophys 2021; 79:575-592. [PMID: 34085165 DOI: 10.1007/s12013-021-01005-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2021] [Indexed: 12/14/2022]
Abstract
Sphingosine-1-phosphate (S1P), a bioactive lipid mediator, is generated from sphingosine by sphingosine kinases (SPHKs) 1 and 2 and is metabolized to ∆2-hexadecenal (∆2-HDE) and ethanolamine phosphate by S1P lyase (S1PL) in mammalian cells. We have recently demonstrated the activation of nuclear SPHK2 and the generation of S1P in the nucleus of lung epithelial cells exposed to Pseudomonas aeruginosa. Here, we have investigated the nuclear localization of S1PL and the role of ∆2-HDE generated from S1P in the nucleus as a modulator of histone deacetylase (HDAC) activity and histone acetylation. Electron micrographs of the nuclear fractions isolated from MLE-12 cells showed nuclei free of ER contamination, and S1PL activity was detected in nuclear fractions isolated from primary lung bronchial epithelial cells and alveolar epithelial MLE-12 cells. Pseudomonas aeruginosa-mediated nuclear ∆2-HDE generation, and H3/H4 histone acetylation was attenuated by S1PL inhibitors in MLE-12 cells and human bronchial epithelial cells. In vitro, the addition of exogenous ∆2-HDE (100-10,000 nM) to lung epithelial cell nuclear preparations inhibited HDAC1/2 activity, and increased acetylation of Histone H3 and H4, whereas similar concentrations of S1P did not show a significant change. In addition, incubation of ∆2-HDE with rHDAC1 generated five different amino acid adducts as detected by LC-MS/MS; the predominant adduct being ∆2-HDE with lysine residues of HDAC1. Together, these data show an important role for the nuclear S1PL-derived ∆2-HDE in the modification of HDAC activity, histone acetylation, and chromatin remodeling in lung epithelial cells.
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Affiliation(s)
- David L Ebenezer
- Departments of Pharmacology & Regenerative Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Ramaswamy Ramchandran
- Departments of Pharmacology & Regenerative Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Panfeng Fu
- The Affiliated Hospital of School of Medicine, Ningbo University, Ningbo, China
| | - Lizar A Mangio
- Departments of Pharmacology & Regenerative Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Vidyani Suryadevara
- Departments of Pharmacology & Regenerative Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Alison W Ha
- Department of Biochemistry & Molecular Genetics, University of Illinois at Chicago, Chicago, IL, USA
| | - Evgeny Berdyshev
- Department of Medicine, National Jewish Medical Center, Denver, CO, USA
| | - Paul P Van Veldhoven
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Stephen J Kron
- Department of Molecular Genetics and Cell Biology and Ludwig Center for Metastasis Research, The University of Chicago, Chicago, IL, USA
| | - Fabian Schumacher
- Institute of Pharmacy, Department of Pharmacology & Toxicology, Freie Universität Berlin, Berlin, Germany
| | - Burkhard Kleuser
- Institute of Pharmacy, Department of Pharmacology & Toxicology, Freie Universität Berlin, Berlin, Germany
| | - Viswanathan Natarajan
- Departments of Pharmacology & Regenerative Medicine, University of Illinois at Chicago, Chicago, IL, USA. .,Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA.
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10
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Das Y, Swinkels D, Kocherlakota S, Vinckier S, Vaz FM, Wever E, van Kampen AHC, Jun B, Do KV, Moons L, Bazan NG, Van Veldhoven PP, Baes M. Peroxisomal Multifunctional Protein 2 Deficiency Perturbs Lipid Homeostasis in the Retina and Causes Visual Dysfunction in Mice. Front Cell Dev Biol 2021; 9:632930. [PMID: 33604342 PMCID: PMC7884615 DOI: 10.3389/fcell.2021.632930] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 01/11/2021] [Indexed: 01/09/2023] Open
Abstract
Patients lacking multifunctional protein 2 (MFP2), the central enzyme of the peroxisomal β-oxidation pathway, develop retinopathy. This pathway is involved in the metabolism of very long chain (VLCFAs) and polyunsaturated (PUFAs) fatty acids, which are enriched in the photoreceptor outer segments (POS). The molecular mechanisms underlying the retinopathy remain, however, elusive. Here, we report that mice with MFP2 inactivation display decreased retinal function already at the age of 3 weeks, which is accompanied by a profound shortening of the photoreceptor outer and inner segments, but with preserved photoreceptor ultrastructure. Furthermore, MFP2 deficient retinas exhibit severe changes in gene expression with downregulation of genes involved in the phototransduction pathway and upregulation of inflammation related genes. Lipid profiling of the mutant retinas revealed a profound reduction of DHA-containing phospholipids. This was likely due to a hampered systemic supply and retinal traffic of this PUFA, although we cannot exclude that the local defect of peroxisomal β-oxidation contributes to this DHA decrease. Moreover, very long chain PUFAs were also reduced, with the exception of those containing ≥ 34 carbons that accumulated. The latter suggests that there is an uncontrollable elongation of retinal PUFAs. In conclusion, our data reveal that intact peroxisomal β-oxidation is indispensable for retinal integrity, most likely by maintaining PUFA homeostasis.
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Affiliation(s)
- Yannick Das
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Daniëlle Swinkels
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Sai Kocherlakota
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Stefan Vinckier
- Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology, KU Leuven-VIB, Leuven, Belgium
| | - Frédéric M Vaz
- Laboratory of Genetic Metabolic Diseases, Department of Clinical Chemistry and Pediatrics, Amsterdam University Medical Center (UMC), University of Amsterdam, Amsterdam, Netherlands.,Core Facility Metabolomics, Amsterdam University Medical Center (UMC), Amsterdam, Netherlands
| | - Eric Wever
- Laboratory of Genetic Metabolic Diseases, Department of Clinical Chemistry and Pediatrics, Amsterdam University Medical Center (UMC), University of Amsterdam, Amsterdam, Netherlands.,Core Facility Metabolomics, Amsterdam University Medical Center (UMC), Amsterdam, Netherlands.,Bioinformatics Laboratory, Department of Epidemiology and Data Science, Amsterdam Public Health Research Institute, Amsterdam University Medical Center (UMC), University of Amsterdam, Amsterdam, Netherlands
| | - Antoine H C van Kampen
- Bioinformatics Laboratory, Department of Epidemiology and Data Science, Amsterdam Public Health Research Institute, Amsterdam University Medical Center (UMC), University of Amsterdam, Amsterdam, Netherlands.,Biosystems Data Analysis, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Bokkyoo Jun
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, New Orleans, LA, United States
| | - Khanh V Do
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, New Orleans, LA, United States
| | - Lieve Moons
- Animal Physiology and Neurobiology, Department of Biology, KU Leuven, Leuven, Belgium
| | - Nicolas G Bazan
- Neuroscience Center of Excellence, School of Medicine, Louisiana State University Health New Orleans, New Orleans, LA, United States
| | - Paul P Van Veldhoven
- Lipid Biochemistry and Protein Interactions (LIPIT), Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
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11
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Van Veldhoven PP, de Schryver E, Young SG, Zwijsen A, Fransen M, Espeel M, Baes M, Van Ael E. Slc25a17 Gene Trapped Mice: PMP34 Plays a Role in the Peroxisomal Degradation of Phytanic and Pristanic Acid. Front Cell Dev Biol 2020; 8:144. [PMID: 32266253 PMCID: PMC7106852 DOI: 10.3389/fcell.2020.00144] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 02/20/2020] [Indexed: 12/04/2022] Open
Abstract
Mice lacking PMP34, a peroxisomal membrane transporter encoded by Slc25a17, did not manifest any obvious phenotype on a Swiss Webster genetic background, even with various treatments designed to unmask impaired peroxisomal functioning. Peroxisomal α- and β-oxidation rates in PMP34 deficient fibroblasts or liver slices were not or only modestly affected and in bile, no abnormal bile acid intermediates were detected. Peroxisomal content of cofactors like CoA, ATP, NAD+, thiamine-pyrophosphate and pyridoxal-phosphate, based on direct or indirect data, appeared normal as were tissue plasmalogen and very long chain fatty acid levels. However, upon dietary phytol administration, the knockout mice displayed hepatomegaly, liver inflammation, and an induction of peroxisomal enzymes. This phenotype was partially mediated by PPARα. Hepatic triacylglycerols and cholesterylesters were elevated and both phytanic acid and pristanic acid accumulated in the liver lipids, in females to higher extent than in males. In addition, pristanic acid degradation products were detected, as wells as the CoA-esters of all these branched fatty acids. Hence, PMP34 is important for the degradation of phytanic/pristanic acid and/or export of their metabolites. Whether this is caused by a shortage of peroxisomal CoA affecting the intraperoxisomal formation of pristanoyl-CoA (and perhaps of phytanoyl-CoA), or the SCPx-catalyzed thiolytic cleavage during pristanic acid β-oxidation, could not be proven in this model, but the phytol-derived acyl-CoA profile is compatible with the latter possibility. On the other hand, the normal functioning of other peroxisomal pathways, and especially bile acid formation, seems to exclude severe transport problems or a shortage of CoA, and other cofactors like FAD, NAD(P)+, TPP. Based on our findings, PMP34 deficiency in humans is unlikely to be a life threatening condition but could cause elevated phytanic/pristanic acid levels in older adults.
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Affiliation(s)
| | - Evelyn de Schryver
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Stephen G. Young
- Departments of Medicine and Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - An Zwijsen
- Laboratory of Developmental Signaling, Department Human Genetics, VIB-KU Leuven, Leuven, Belgium
| | - Marc Fransen
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Marc Espeel
- Department of Anatomy, Embryology, Histology and Medical Physics, Ghent University, Ghent, Belgium
| | - Myriam Baes
- Laboratory of Cell Metabolism, Faculty of Pharmaceutical Sciences, KU Leuven, Leuven, Belgium
| | - Elke Van Ael
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
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12
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Fransen M, Revenco I, Li H, Costa CF, Lismont C, Van Veldhoven PP. Peroxisomal Dysfunction and Oxidative Stress in Neurodegenerative Disease: A Bidirectional Crosstalk. Adv Exp Med Biol 2020; 1299:19-30. [PMID: 33417204 DOI: 10.1007/978-3-030-60204-8_2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Peroxisomes are multifunctional organelles best known for their role in cellular lipid and hydrogen peroxide metabolism. In this chapter, we review and discuss the diverse functions of this organelle in brain physiology and neurodegeneration, with a particular focus on oxidative stress. We first briefly summarize what is known about the various nexuses among peroxisomes, the central nervous system, oxidative stress, and neurodegenerative disease. Next, we provide a comprehensive overview of the complex interplay among peroxisomes, oxidative stress, and neurodegeneration in patients suffering from primary peroxisomal disorders. Particular examples that are discussed include the prototypic Zellweger spectrum disorders and X-linked adrenoleukodystrophy, the most prevalent peroxisomal disorder. Thereafter, we elaborate on secondary peroxisome dysfunction in more common neurodegenerative disorders, including Alzheimer's disease, Parkinson's disease, and multiple sclerosis. Finally, we highlight some issues and challenges that need to be addressed to progress towards therapies and prevention strategies preserving, normalizing, or improving peroxisome activity in patients suffering from neurodegenerative conditions.
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Affiliation(s)
- Marc Fransen
- Department of Cellular and Molecular Medicine, Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium.
| | - Iulia Revenco
- Department of Cellular and Molecular Medicine, Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium
| | - Hongli Li
- Department of Cellular and Molecular Medicine, Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium
| | - Cláudio F Costa
- Department of Cellular and Molecular Medicine, Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium
| | - Celien Lismont
- Department of Cellular and Molecular Medicine, Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium
| | - Paul P Van Veldhoven
- Department of Cellular and Molecular Medicine, Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium
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13
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Lismont C, Koster J, Provost S, Baes M, Van Veldhoven PP, Waterham HR, Fransen M. Deciphering the potential involvement of PXMP2 and PEX11B in hydrogen peroxide permeation across the peroxisomal membrane reveals a role for PEX11B in protein sorting. Biochimica et Biophysica Acta (BBA) - Biomembranes 2019; 1861:182991. [DOI: 10.1016/j.bbamem.2019.05.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 05/09/2019] [Accepted: 05/21/2019] [Indexed: 02/07/2023]
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14
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Slezak M, Kandler S, Van Veldhoven PP, Van den Haute C, Bonin V, Holt MG. Distinct Mechanisms for Visual and Motor-Related Astrocyte Responses in Mouse Visual Cortex. Curr Biol 2019; 29:3120-3127.e5. [PMID: 31495587 PMCID: PMC6859477 DOI: 10.1016/j.cub.2019.07.078] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 06/19/2019] [Accepted: 07/26/2019] [Indexed: 02/02/2023]
Abstract
Astrocytes are a major cell type in the mammalian nervous system, are in close proximity to neurons, and show rich Ca2+ activity thought to mediate cellular outputs. Astrocytes show activity linked to sensory [1, 2] and motor [3, 4] events, reflecting local neural activity and brain-wide neuromodulatory inputs. Sensory responses are highly variable [5, 6, 7, 8, 9, 10], which may reflect interactions between distinct input types [6, 7, 9]. However, the diversity of inputs generating astrocyte activity, particularly during sensory stimulation and behavior, is not fully understood [11, 12]. Using a combination of Ca2+ imaging, a treadmill assay, and visual stimulation, we examined the properties of astrocyte activity in mouse visual cortex associated with motor or sensory events. Consistent with previous work, motor activity activated astrocytes across the cortex with little specificity, reflecting a diffuse neuromodulatory mechanism. In contrast, moving visual stimuli generated specific activity patterns that reflected the stimulus' trajectory within the visual field, precisely as one would predict if astrocytes reported local neural activity. Visual responses depended strongly on behavioral state, with astrocytes showing high amplitude Ca2+ transients during locomotion and little activity during stillness. Furthermore, the amplitudes of visual responses were highly correlated with pupil size, suggesting a role of arousal. Interestingly, while depletion of cortical noradrenaline abolished locomotor responses, visual responses were only reduced in amplitude and their spatiotemporal organization remained intact, suggesting two distinct types of inputs underlie visual responses. We conclude that cortical astrocytes integrate local sensory information and behavioral state, suggesting a role in information processing. Astrocytes of moving mice display robust retinotopic responses to visual stimuli Sensory responses are distinguishable from responses to locomotion Vision-driven responses are correlated to arousal Vision- and arousal-driven responses are differentially regulated by noradrenaline
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Affiliation(s)
- Michal Slezak
- Neuro-Electronics Research Flanders (NERF), Kapeldreef 75, 3001 Leuven, Belgium; VIB Center for Brain and Disease Research, Herestraat 49-Box 602, 3000 Leuven, Belgium
| | - Steffen Kandler
- Neuro-Electronics Research Flanders (NERF), Kapeldreef 75, 3001 Leuven, Belgium; IMEC, Kapeldreef 75, 3001 Leuven, Belgium
| | - Paul P Van Veldhoven
- KU Leuven, Department of Cellular and Molecular Medicine, LIPIT, Herestraat 49-Box 601, 3000 Leuven, Belgium
| | - Chris Van den Haute
- KU Leuven, Laboratory for Neurobiology and Gene Therapy and Leuven Brain Institute, RK-Herestraat 49-Box 1023, 3000 Leuven, Belgium; KU Leuven, Leuven Viral Vector Core, RK-Herestraat 49, 3000 Leuven, Belgium
| | - Vincent Bonin
- Neuro-Electronics Research Flanders (NERF), Kapeldreef 75, 3001 Leuven, Belgium; IMEC, Kapeldreef 75, 3001 Leuven, Belgium; KU Leuven, Department of Biology and Leuven Brain Institute, Naamsestraat 59-Box 2465, 3001 Leuven, Belgium.
| | - Matthew G Holt
- VIB Center for Brain and Disease Research, Herestraat 49-Box 602, 3000 Leuven, Belgium; KU Leuven, Department of Neuroscience and Leuven Brain Institute, Herestraat 49-Box 1021, 3000 Leuven, Belgium.
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15
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Goossens C, Weckx R, Derde S, Dufour T, Vander Perre S, Pauwels L, Thiessen SE, Van Veldhoven PP, Van den Berghe G, Langouche L. Adipose tissue protects against sepsis-induced muscle weakness in mice: from lipolysis to ketones. Crit Care 2019; 23:236. [PMID: 31262340 PMCID: PMC6600878 DOI: 10.1186/s13054-019-2506-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 06/04/2019] [Indexed: 02/07/2023]
Abstract
Background ICU-acquired weakness is a debilitating consequence of prolonged critical illness that is associated with poor outcome. Recently, premorbid obesity has been shown to protect against such illness-induced muscle wasting and weakness. Here, we hypothesized that this protection was due to increased lipid and ketone availability. Methods In a centrally catheterized, fluid-resuscitated, antibiotic-treated mouse model of prolonged sepsis, we compared markers of lipolysis and fatty acid oxidation in lean and obese septic mice (n = 117). Next, we compared markers of muscle wasting and weakness in septic obese wild-type and adipose tissue-specific ATGL knockout (AAKO) mice (n = 73), in lean septic mice receiving either intravenous infusion of lipids or standard parenteral nutrition (PN) (n = 70), and in lean septic mice receiving standard PN supplemented with either the ketone body 3-hydroxybutyrate or isocaloric glucose (n = 49). Results Obese septic mice had more pronounced lipolysis (p ≤ 0.05), peripheral fatty acid oxidation (p ≤ 0.05), and ketogenesis (p ≤ 0.05) than lean mice. Blocking lipolysis in obese septic mice caused severely reduced muscle mass (32% loss vs. 15% in wild-type, p < 0.001) and specific maximal muscle force (59% loss vs. 0% in wild-type; p < 0.001). In contrast, intravenous infusion of lipids in lean septic mice maintained specific maximal muscle force up to healthy control levels (p = 0.6), whereas this was reduced with 28% in septic mice receiving standard PN (p = 0.006). Muscle mass was evenly reduced with 29% in both lean septic groups (p < 0.001). Lipid administration enhanced fatty acid oxidation (p ≤ 0.05) and ketogenesis (p < 0.001), but caused unfavorable liver steatosis (p = 0.01) and a deranged lipid profile (p ≤ 0.01). Supplementation of standard PN with 3-hydroxybutyrate also attenuated specific maximal muscle force up to healthy control levels (p = 0.1), but loss of muscle mass could not be prevented (25% loss in both septic groups; p < 0.001). Importantly, this intervention improved muscle regeneration markers (p ≤ 0.05) without the unfavorable side effects seen with lipid infusion. Conclusions Obesity-induced muscle protection during sepsis is partly mediated by elevated mobilization and metabolism of endogenous fatty acids. Furthermore, increased availability of ketone bodies, either through ketogenesis or through parenteral infusion, appears to protect against sepsis-induced muscle weakness also in the lean. Electronic supplementary material The online version of this article (10.1186/s13054-019-2506-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Chloë Goossens
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Ruben Weckx
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Sarah Derde
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Thomas Dufour
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Sarah Vander Perre
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Lies Pauwels
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Steven E Thiessen
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory for Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Greet Van den Berghe
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Lies Langouche
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium.
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16
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Ebenezer DL, Fu P, Mangio LA, Berdyshev E, Schumacher F, Kleuser B, Van Veldhoven PP, Natarajan V. Δ‐2 Hexadecenal Generated from S1P by Nuclear S1P Lyase Is a Regulator of HDAC1/2 Activity and Histone Acetylation in Lung Epithelial Cells. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.489.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Panfeng Fu
- PharmacologyUniversity of IllinoisChicagoIL
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17
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Malheiro AR, Correia B, Ferreira da Silva T, Bessa-Neto D, Van Veldhoven PP, Brites P. Leukodystrophy caused by plasmalogen deficiency rescued by glyceryl 1-myristyl ether treatment. Brain Pathol 2019; 29:622-639. [PMID: 30667116 DOI: 10.1111/bpa.12710] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 01/16/2019] [Indexed: 12/29/2022] Open
Abstract
Plasmalogens are the most abundant form of ether phospholipids in myelin and their deficiency causes Rhizomelic Chondrodysplasia Punctata (RCDP), a severe developmental disorder. Using the Gnpat-knockout (KO) mouse as a model of RCDP, we determined the consequences of a plasmalogen deficiency during myelination and myelin homeostasis in the central nervous system (CNS). We unraveled that the lack of plasmalogens causes a generalized hypomyelination in several CNS regions including the optic nerve, corpus callosum and spinal cord. The defect in myelin content evolved to a progressive demyelination concomitant with generalized astrocytosis and white matter-selective microgliosis. Oligodendrocyte precursor cells (OPC) and mature oligodendrocytes were abundant in the CNS of Gnpat KO mice during the active period of demyelination. Axonal loss was minimal in plasmalogen-deficient mice, although axonal damage was observed in spinal cords from aged Gnpat KO mice. Characterization of the plasmalogen-deficient myelin identified myelin basic protein and septin 7 as early markers of dysmyelination, whereas myelin-associated glycoprotein was associated with the active demyelination phase. Using in vitro myelination assays, we unraveled that the intrinsic capacity of oligodendrocytes to ensheath and initiate membrane wrapping requires plasmalogens. The defect in plasmalogens was rescued with glyceryl 1-myristyl ether [1-O-tetradecyl glycerol (1-O-TDG)], a novel alternative precursor in the plasmalogen biosynthesis pathway. 1-O-TDG treatment rescued myelination in plasmalogen-deficient oligodendrocytes and in mutant mice. Our results demonstrate the importance of plasmalogens for oligodendrocyte function and myelin assembly, and identified a novel strategy to promote myelination in nervous tissue.
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Affiliation(s)
- Ana R Malheiro
- Neurolipid Biology, Instituto de Investigação e Inovação em Saúde - i3S, Instituto de Biologia Molecular e Celular - IBMC e Universidade do Porto, Porto, Portugal.,ICBAS, Instituto Ciências Biomédicas Abel Salazar, Porto, Portugal
| | - Barbara Correia
- Neurolipid Biology, Instituto de Investigação e Inovação em Saúde - i3S, Instituto de Biologia Molecular e Celular - IBMC e Universidade do Porto, Porto, Portugal
| | - Tiago Ferreira da Silva
- Neurolipid Biology, Instituto de Investigação e Inovação em Saúde - i3S, Instituto de Biologia Molecular e Celular - IBMC e Universidade do Porto, Porto, Portugal
| | - Diogo Bessa-Neto
- Neurolipid Biology, Instituto de Investigação e Inovação em Saúde - i3S, Instituto de Biologia Molecular e Celular - IBMC e Universidade do Porto, Porto, Portugal
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions (LIPIT), KU Leuven, Leuven, Belgium
| | - Pedro Brites
- Neurolipid Biology, Instituto de Investigação e Inovação em Saúde - i3S, Instituto de Biologia Molecular e Celular - IBMC e Universidade do Porto, Porto, Portugal
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18
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Baboota RK, Shinde AB, Lemaire K, Fransen M, Vinckier S, Van Veldhoven PP, Schuit F, Baes M. Functional peroxisomes are required for β-cell integrity in mice. Mol Metab 2019; 22:71-83. [PMID: 30795913 PMCID: PMC6437690 DOI: 10.1016/j.molmet.2019.02.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 01/25/2019] [Accepted: 02/04/2019] [Indexed: 12/24/2022] Open
Abstract
Objectives Peroxisomes play a crucial role in lipid and reactive oxygen species metabolism, but their importance for pancreatic β-cell functioning is presently unknown. To examine the contribution of peroxisomal metabolism to β-cell homeostasis in mice, we inactivated PEX5, the import receptor for peroxisomal matrix proteins, in an inducible and β-cell restricted manner (Rip-Pex5−/− mice). Methods After tamoxifen-induced recombination of the Pex5 gene at the age of 6 weeks, mice were fed either normal chow or a high-fat diet for 12 weeks and were subsequently phenotyped. Results Increased levels of very long chain fatty acids and reduced levels of plasmalogens in islets confirmed impairment of peroxisomal fatty acid oxidation and ether lipid synthesis, respectively. The Rip-Pex5−/− mice fed on either diet exhibited glucose intolerance associated with impaired insulin secretion. Ultrastructural and biochemical analysis revealed a decrease in the density of mature insulin granules and total pancreatic insulin content, which was further accompanied by mitochondrial disruptions, reduced complex I activity and massive vacuole overload in β-cells. RNAseq analysis suggested that cell death pathways were affected in islets from HFD-fed Rip-Pex5−/− mice. Consistent with this change we observed increased β-cell apoptosis in islets and a decrease in β-cell mass. Conclusions Our data indicate that normal peroxisome metabolism in β-cells is crucial to preserve their structure and function. Pex5 deletion in β-cells impairs glucose tolerance and reduces β-cell mass. Pex5-deficient β-cells display increased apoptosis. Peroxisomal loss causes mitochondrial deterioration and cytoplasmic vacuolization.
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Affiliation(s)
- Ritesh Kumar Baboota
- KU Leuven - University of Leuven, Department of Pharmaceutical and Pharmacological Sciences, Laboratory of Cell Metabolism, B-3000, Leuven, Belgium
| | - Abhijit Babaji Shinde
- KU Leuven - University of Leuven, Department of Pharmaceutical and Pharmacological Sciences, Laboratory of Cell Metabolism, B-3000, Leuven, Belgium
| | - Katleen Lemaire
- KU Leuven - University of Leuven, Department of Cellular and Molecular Medicine, Gene Expression Unit, B-3000, Leuven, Belgium
| | - Marc Fransen
- KU Leuven - University of Leuven, Department of Cellular and Molecular Medicine, Laboratory for Lipid Biochemistry and Protein Interactions, KU Leuven, B-3000, Leuven, Belgium
| | - Stefan Vinckier
- VIB-KULeuven Centre for Cancer Biology, Laboratory of Angiogenesis and Vascular Metabolism, B-3000, Leuven, Belgium
| | - Paul P Van Veldhoven
- KU Leuven - University of Leuven, Department of Cellular and Molecular Medicine, Laboratory for Lipid Biochemistry and Protein Interactions, KU Leuven, B-3000, Leuven, Belgium
| | - Frans Schuit
- KU Leuven - University of Leuven, Department of Cellular and Molecular Medicine, Gene Expression Unit, B-3000, Leuven, Belgium
| | - Myriam Baes
- KU Leuven - University of Leuven, Department of Pharmaceutical and Pharmacological Sciences, Laboratory of Cell Metabolism, B-3000, Leuven, Belgium.
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19
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Das Y, Roose N, De Groef L, Fransen M, Moons L, Van Veldhoven PP, Baes M. Differential distribution of peroxisomal proteins points to specific roles of peroxisomes in the murine retina. Mol Cell Biochem 2019; 456:53-62. [PMID: 30604065 DOI: 10.1007/s11010-018-3489-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 12/14/2018] [Indexed: 12/21/2022]
Abstract
The retinal pathology in peroxisomal disorders suggests that peroxisomes are important to maintain retinal homeostasis and function. These ubiquitous cell organelles are mainly involved in lipid metabolism, which comprises α- and β-oxidation and ether lipid synthesis. Although peroxisomes were extensively studied in liver, their role in the retina still remains to be elucidated. As a first step in gaining more insight into the role of peroxisomes in retinal physiology, we performed immunohistochemical stainings, immunoblotting and enzyme activity measurements to reveal the distribution of peroxisomes and peroxisomal lipid metabolizing enzymes in the murine retina. Whereas peroxisomes were detected in every retinal layer, we found a clear differential distribution of the peroxisomal lipid metabolizing enzymes in the neural retina compared to the retinal pigment epithelium. In particular, the ABC transporters that transfer lipid substrates into the organelle as well as several enzymes of the β-oxidation pathway were enriched either in the neural retina or in the retinal pigment epithelium. In conclusion, our results strongly indicate that peroxisome function varies between different regions in the murine retina.
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Affiliation(s)
- Yannick Das
- Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven -University of Leuven, 3000, Leuven, Belgium
| | - Nele Roose
- Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven -University of Leuven, 3000, Leuven, Belgium
| | - Lies De Groef
- Department of Biology, Animal Physiology and Neurobiology, KU Leuven -University of Leuven, 3000, Leuven, Belgium
| | - Marc Fransen
- Department of Cellular and Molecular Medicine, Lipid Biochemistry and Protein Interactions (LIPIT), KU Leuven -University of Leuven, 3000, Leuven, Belgium
| | - Lieve Moons
- Department of Biology, Animal Physiology and Neurobiology, KU Leuven -University of Leuven, 3000, Leuven, Belgium
| | - Paul P Van Veldhoven
- Department of Cellular and Molecular Medicine, Lipid Biochemistry and Protein Interactions (LIPIT), KU Leuven -University of Leuven, 3000, Leuven, Belgium
| | - Myriam Baes
- Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven -University of Leuven, 3000, Leuven, Belgium.
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20
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Lismont C, Nordgren M, Brees C, Knoops B, Van Veldhoven PP, Fransen M. Peroxisomes as Modulators of Cellular Protein Thiol Oxidation: A New Model System. Antioxid Redox Signal 2019; 30:22-39. [PMID: 28594286 DOI: 10.1089/ars.2017.6997] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
AIMS Peroxisomes are ubiquitous, single-membrane-bounded organelles that contain considerable amounts of enzymes involved in the production or breakdown of hydrogen peroxide (H2O2), a key signaling molecule in multiple biological processes and disease states. Despite this, the role of this organelle in cross-compartmental H2O2 signaling remains largely unclear, mainly because of the difficulty to modulate peroxisomal H2O2 production in a selective manner. This study aimed at establishing and validating a cellular model suitable to decipher the complex signaling processes associated with peroxisomal H2O2 release. RESULTS Here, we report the development of a human cell line that can be used to selectively generate H2O2 inside peroxisomes in a time- and dose-controlled manner. In addition, we provide evidence that peroxisome-derived H2O2 can oxidize redox-sensitive cysteine residues in multiple proteins within (e.g., peroxiredoxin-5 [PRDX5]) and outside (e.g., nuclear factor kappa B subunit 1 [NFKB1] and subunit RELA proto-oncogene [RELA], phosphatase and tensin homolog [PTEN], forkhead box O3 [FOXO3], and peroxin 5 [PEX5]) the peroxisomal compartment. Furthermore, we show that the extent of protein oxidation depends on the subcellular location of the target protein and is inversely correlated to catalase activity and cellular glutathione content. Finally, we demonstrate that excessive H2O2 production inside peroxisomes does not induce their selective degradation, at least not under the conditions examined. INNOVATION This study describes for the first time a powerful model system that can be used to examine the role of peroxisome-derived H2O2 in redox-regulated (patho)physiological processes, a research area in need of further investigation and innovative approaches. CONCLUSION Our results provide unambiguous evidence that peroxisomes can serve as regulatory hubs in thiol-based signaling networks.
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Affiliation(s)
- Celien Lismont
- 1 Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven-University of Leuven , Leuven, Belgium
| | - Marcus Nordgren
- 1 Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven-University of Leuven , Leuven, Belgium
| | - Chantal Brees
- 1 Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven-University of Leuven , Leuven, Belgium
| | - Bernard Knoops
- 2 Group of Animal Molecular and Cellular Biology, Institut des Sciences de la Vie (ISV), Université catholique de Louvain , Louvain-la-Neuve, Belgium
| | - Paul P Van Veldhoven
- 1 Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven-University of Leuven , Leuven, Belgium
| | - Marc Fransen
- 1 Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven-University of Leuven , Leuven, Belgium
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21
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Karnati S, Oruqaj G, Janga H, Tumpara S, Colasante C, Van Veldhoven PP, Braverman N, Pilatz A, Mariani TJ, Baumgart-Vogt E. PPARα-mediated peroxisome induction compensates PPARγ-deficiency in bronchiolar club cells. PLoS One 2018; 13:e0203466. [PMID: 30212482 PMCID: PMC6136741 DOI: 10.1371/journal.pone.0203466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 08/21/2018] [Indexed: 11/18/2022] Open
Abstract
Despite the important functions of PPARγ in various cell types of the lung, PPARγ-deficiency in club cells induces only mild emphysema. Peroxisomes are distributed in a similar way as PPARγ in the lung and are mainly enriched in club and AECII cells. To date, the effects of PPARγ-deficiency on the overall peroxisomal compartment and its metabolic alterations in pulmonary club cells are unknown. Therefore, we characterized wild-type and club cell-specific PPARγ knockout-mice lungs and used C22 cells to investigate the peroxisomal compartment and its metabolic roles in the distal airway epithelium by means of 1) double-immunofluorescence labelling for peroxisomal proteins, 2) laser-assisted microdissection of the bronchiolar epithelium and subsequent qRT-PCR, 3) siRNA-transfection of PPARγand PPRE dual-luciferase reporter activity in C22 cells, 4) PPARg inhibition by GW9662, 5) GC-MS based lipid analysis. Our results reveal elevated levels of fatty acids, increased expression of PPARα and PPRE activity, a strong overall upregulation of the peroxisomal compartment and its associated gene expression (biogenesis, α-oxidation, β-oxidation, and plasmalogens) in PPARγ-deficient club cells. Interestingly, catalase was significantly increased and mistargeted into the cytoplasm, suggestive for oxidative stress by the PPARγ-deficiency in club cells. Taken together, PPARα-mediated metabolic induction and proliferation of peroxisomes via a PPRE-dependent mechanism could compensate PPARγ-deficiency in club cells.
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Affiliation(s)
- Srikanth Karnati
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University, Giessen, Germany
- * E-mail: ,
| | - Gani Oruqaj
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University, Giessen, Germany
| | - Harshavardhan Janga
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University, Giessen, Germany
| | - Srinu Tumpara
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University, Giessen, Germany
| | - Claudia Colasante
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University, Giessen, Germany
| | - Paul P. Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium
| | - Nancy Braverman
- Depts. of Human Genetics and Pediatrics, McGill University-Montreal Children’s Hospital Research Institute, Montreal, Canada
| | - Adrian Pilatz
- Department of Urology, Pediatric Urology and Andrology, Justus Liebig University Giessen, Giessen, Germany
| | - Thomas J. Mariani
- Division of Neonatology and Pediatric Molecular and Personalized Medicine Program, University of Rochester Medical Center, Rochester, New York, United States of America
| | - Eveline Baumgart-Vogt
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University, Giessen, Germany
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22
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Shinde AB, Baboota RK, Denis S, Loizides-Mangold U, Peeters A, Espeel M, Malheiro AR, Riezman H, Vinckier S, Vaz FM, Brites P, Ferdinandusse S, Van Veldhoven PP, Baes M. Mitochondrial disruption in peroxisome deficient cells is hepatocyte selective but is not mediated by common hepatic peroxisomal metabolites. Mitochondrion 2018; 39:51-59. [DOI: 10.1016/j.mito.2017.08.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 08/25/2017] [Indexed: 01/06/2023]
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23
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Geric I, Tyurina YY, Krysko O, Krysko DV, De Schryver E, Kagan VE, Van Veldhoven PP, Baes M, Verheijden S. Lipid homeostasis and inflammatory activation are disturbed in classically activated macrophages with peroxisomal β-oxidation deficiency. Immunology 2017; 153:342-356. [PMID: 28940384 DOI: 10.1111/imm.12844] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 09/13/2017] [Accepted: 09/17/2017] [Indexed: 01/07/2023] Open
Abstract
Macrophage activation is characterized by pronounced metabolic adaptation. Classically activated macrophages show decreased rates of mitochondrial fatty acid oxidation and oxidative phosphorylation and acquire a glycolytic state together with their pro-inflammatory phenotype. In contrast, alternatively activated macrophages require oxidative phosphorylation and mitochondrial fatty acid oxidation for their anti-inflammatory function. Although it is evident that mitochondrial metabolism is regulated during macrophage polarization and essential for macrophage function, little is known on the regulation and role of peroxisomal β-oxidation during macrophage activation. In this study, we show that peroxisomal β-oxidation is strongly decreased in classically activated bone-marrow-derived macrophages (BMDM) and mildly induced in alternatively activated BMDM. To examine the role of peroxisomal β-oxidation in macrophages, we used Mfp2-/- BMDM lacking the key enzyme of this pathway. Impairment of peroxisomal β-oxidation in Mfp2-/- BMDM did not cause lipid accumulation but rather an altered distribution of lipid species with very-long-chain fatty acids accumulating in the triglyceride and phospholipid fraction. These lipid alterations in Mfp2-/- macrophages led to decreased inflammatory activation of Mfp2-/- BMDM and peritoneal macrophages evidenced by impaired production of several inflammatory cytokines and chemokines, but did not affect anti-inflammatory polarization. The disturbed inflammatory responses of Mfp2-/- macrophages did not affect immune cell infiltration, as mice with selective elimination of MFP2 from myeloid cells showed normal monocyte and neutrophil influx upon challenge with zymosan. Together, these data demonstrate that peroxisomal β-oxidation is involved in fine-tuning the phenotype of macrophages, probably by influencing the dynamic lipid profile during macrophage polarization.
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Affiliation(s)
- Ivana Geric
- Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven - University of Leuven, Leuven, Belgium
| | - Yulia Y Tyurina
- Department of Environmental and Occupational Health, Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Olga Krysko
- Department of Oto-Rhino-Laryngology, The Upper Airway Research Laboratory, Hospital, Ghent University Ghent, Ghent, Belgium
| | - Dmitri V Krysko
- Molecular Signalling and Cell Death Unit, VIB, Centre for Inflammation Research, Ghent, Belgium.,Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Evelyn De Schryver
- Department of Cellular and Molecular Medicine, LIPIT, KU Leuven - University of Leuven, Leuven, Belgium
| | - Valerian E Kagan
- Department of Environmental and Occupational Health, Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Paul P Van Veldhoven
- Department of Cellular and Molecular Medicine, LIPIT, KU Leuven - University of Leuven, Leuven, Belgium
| | - Myriam Baes
- Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven - University of Leuven, Leuven, Belgium
| | - Simon Verheijden
- Department of Clinical and Experimental Medicine, Translational Research Centre for Gastrointestinal Disorders (TARGID), KU Leuven - University of Leuven, Leuven, Belgium
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24
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Jenkins B, de Schryver E, Van Veldhoven PP, Koulman A. Peroxisomal 2-Hydroxyacyl-CoA Lyase Is Involved in Endogenous Biosynthesis of Heptadecanoic Acid. Molecules 2017; 22:molecules22101718. [PMID: 29027957 PMCID: PMC6151664 DOI: 10.3390/molecules22101718] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 09/28/2017] [Accepted: 10/03/2017] [Indexed: 12/18/2022] Open
Abstract
Circulating heptadecanoic acid (C17:0) is reported to be a pathology risk/prognosis biomarker and a dietary biomarker. This pathology relationship has been shown to be reliably predictive even when independent of dietary contributions, suggesting that the endogenous biosynthesis of C17:0 is related to the pathological aetiology. Little is known about C17:0 biosynthesis, which tissues contribute to the circulating levels, and how C17:0 is related to pathology. Hacl1+/− mice were mated to obtain Hacl1−/− and Hacl1+/+ control mice. At 14 weeks, they were anesthetized for tissue collection and fatty acid analysis. Compared to Hacl1+/+, C15:0 was not significantly affected in any Hacl1−/− tissues. However, the Hacl1−/− plasma and liver C17:0 levels were significantly lower: ~26% and ~22%, respectively. No significant differences were seen in the different adipose tissues. To conclude, Hacl1 plays a significant role in the liver and plasma levels of C17:0, providing evidence it can be endogenously biosynthesized via alpha-oxidation. The strong inverse association of C17:0 with pathology raises the question whether there is a direct link between α-oxidation and these diseases. Currently, there is no clear evidence, warranting further research into the role of α-oxidation in relation to metabolic diseases.
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Affiliation(s)
- Benjamin Jenkins
- NIHR BRC Core Metabolomics and Lipidomics Laboratory, University of Cambridge, Pathology building Level 4, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK.
- Medical Research Council Elsie Widdowson Laboratory, Fulbourn Road, Cambridge CB1 9NL, UK.
| | - Evelyn de Schryver
- Laboratory of Lipid Biochemistry and Protein Interactions (LIPIT), Campus Gasthuisberg-KU Leuven, Herestraat Box 601, B-3000 Leuven, Belgium.
| | - Paul P. Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions (LIPIT), Campus Gasthuisberg-KU Leuven, Herestraat Box 601, B-3000 Leuven, Belgium.
| | - Albert Koulman
- NIHR BRC Core Metabolomics and Lipidomics Laboratory, University of Cambridge, Pathology building Level 4, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK.
- Medical Research Council Elsie Widdowson Laboratory, Fulbourn Road, Cambridge CB1 9NL, UK.
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25
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Lyman KA, Han Y, Heuermann RJ, Cheng X, Kurz JE, Lyman RE, Van Veldhoven PP, Chetkovich DM. Allostery between two binding sites in the ion channel subunit TRIP8b confers binding specificity to HCN channels. J Biol Chem 2017; 292:17718-17730. [PMID: 28887304 DOI: 10.1074/jbc.m117.802256] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 09/05/2017] [Indexed: 12/20/2022] Open
Abstract
Tetratricopeptide repeat (TPR) domains are ubiquitous structural motifs that mediate protein-protein interactions. For example, the TPR domains in the peroxisomal import receptor PEX5 enable binding to a range of type 1 peroxisomal targeting signal motifs. A homolog of PEX5, tetratricopeptide repeat-containing Rab8b-interacting protein (TRIP8b), binds to and functions as an auxiliary subunit of hyperpolarization-activated cyclic nucleotide (HCN)-gated channels. Given the similarity between TRIP8b and PEX5, this difference in function raises the question of what mechanism accounts for their binding specificity. In this report, we found that the cyclic nucleotide-binding domain and the C terminus of the HCN channel are critical for conferring specificity to TRIP8b binding. We show that TRIP8b binds the HCN cyclic nucleotide-binding domain through a 37-residue domain and the HCN C terminus through the TPR domains. Using a combination of fluorescence polarization- and co-immunoprecipitation-based assays, we establish that binding at either site increases affinity at the other. Thus, allosteric coupling of the TRIP8b TPR domains both promotes binding to HCN channels and limits binding to type 1 peroxisomal targeting signal substrates. These results raise the possibility that other TPR domains may be similarly influenced by allosteric mechanisms as a general feature of protein-protein interactions.
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Affiliation(s)
- Kyle A Lyman
- From the Davee Department of Neurology and Clinical Neurosciences and
| | - Ye Han
- From the Davee Department of Neurology and Clinical Neurosciences and
| | | | - Xiangying Cheng
- From the Davee Department of Neurology and Clinical Neurosciences and
| | | | - Reagan E Lyman
- From the Davee Department of Neurology and Clinical Neurosciences and
| | - Paul P Van Veldhoven
- the Laboratory of Lipid Biochemistry and Protein Interactions, Campus Gasthuisberg, KU Leuven, 3000 Leuven, Belgium
| | - Dane M Chetkovich
- From the Davee Department of Neurology and Clinical Neurosciences and .,Physiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611 and
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26
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Muthuramu I, Amin R, Postnov A, Mishra M, Aboumsallem JP, Dresselaers T, Himmelreich U, Van Veldhoven PP, Gheysens O, Jacobs F, De Geest B. Cholesterol-Lowering Gene Therapy Counteracts the Development of Non-ischemic Cardiomyopathy in Mice. Mol Ther 2017; 25:2513-2525. [PMID: 28822689 DOI: 10.1016/j.ymthe.2017.07.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 07/20/2017] [Accepted: 07/27/2017] [Indexed: 02/02/2023] Open
Abstract
A causal role of hypercholesterolemia in non-ischemic heart failure has never been demonstrated. Adeno-associated viral serotype 8 (AAV8)-low-density lipoprotein receptor (AAV8-LDLr) gene transfer was performed in LDLr-deficient mice without and with pressure overload induced by transverse aortic constriction (TAC). AAV8-LDLr gene therapy resulted in an 82.8% (p < 0.0001) reduction of plasma cholesterol compared with controls. Mortality rate was lower (p < 0.05) in AAV8-LDLr TAC mice compared with control TAC mice (hazard ratio for mortality 0.457, 95% confidence interval [CI] 0.237-0.882) during 8 weeks of follow-up. AAV8-LDLr gene therapy attenuated cardiac hypertrophy, reduced interstitial and perivascular fibrosis, and decreased lung congestion in TAC mice. Cardiac function, quantified by invasive hemodynamic measurements and magnetic resonance imaging, was significantly improved 8 weeks after sham operation or after TAC in AAV8-LDLr mice compared with respective control groups. Myocardial protein levels of mammalian target of rapamycin and of acetyl-coenzyme A carboxylase were strikingly decreased following cholesterol lowering in mice without and with pressure overload. AAV8-LDLr therapy potently reduced cardiac glucose uptake and counteracted metabolic remodeling following pressure overload. Furthermore, oxidative stress and myocardial apoptosis were decreased following AAV8-LDLr therapy in mice with pressure overload. In conclusion, cholesterol-lowering gene therapy potently counteracts structural and metabolic remodeling, and enhances cardiac function.
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Affiliation(s)
- Ilayaraja Muthuramu
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Ruhul Amin
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Andrey Postnov
- Nuclear Medicine & Molecular Imaging, Department of Imaging & Pathology, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Mudit Mishra
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Joseph Pierre Aboumsallem
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Tom Dresselaers
- Biomedical MRI, Department of Imaging & Pathology, Catholic University of Leuven, 3000 Leuven, Belgium; Department of Radiology, University Hospitals Leuven, 3000 Leuven, Belgium
| | - Uwe Himmelreich
- Biomedical MRI, Department of Imaging & Pathology, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Olivier Gheysens
- Nuclear Medicine & Molecular Imaging, Department of Imaging & Pathology, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Frank Jacobs
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, 3000 Leuven, Belgium
| | - Bart De Geest
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, 3000 Leuven, Belgium.
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27
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Muthuramu I, Amin R, Postnov A, Mishra M, Jacobs F, Gheysens O, Van Veldhoven PP, De Geest B. Coconut Oil Aggravates Pressure Overload-Induced Cardiomyopathy without Inducing Obesity, Systemic Insulin Resistance, or Cardiac Steatosis. Int J Mol Sci 2017; 18:ijms18071565. [PMID: 28718833 PMCID: PMC5536053 DOI: 10.3390/ijms18071565] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 07/05/2017] [Accepted: 07/15/2017] [Indexed: 12/16/2022] Open
Abstract
Studies evaluating the effects of high-saturated fat diets on cardiac function are most often confounded by diet-induced obesity and by systemic insulin resistance. We evaluated whether coconut oil, containing C12:0 and C14:0 as main fatty acids, aggravates pressure overload-induced cardiomyopathy induced by transverse aortic constriction (TAC) in C57BL/6 mice. Mortality rate after TAC was higher (p < 0.05) in 0.2% cholesterol 10% coconut oil diet-fed mice than in standard chow-fed mice (hazard ratio 2.32, 95% confidence interval 1.16 to 4.64) during eight weeks of follow-up. The effects of coconut oil on cardiac remodeling occurred in the absence of weight gain and of systemic insulin resistance. Wet lung weight was 1.76-fold (p < 0.01) higher in coconut oil mice than in standard chow mice. Myocardial capillary density (p < 0.001) was decreased, interstitial fibrosis was 1.88-fold (p < 0.001) higher, and systolic and diastolic function was worse in coconut oil mice than in standard chow mice. Myocardial glucose uptake was 1.86-fold (p < 0.001) higher in coconut oil mice and was accompanied by higher myocardial pyruvate dehydrogenase levels and higher acetyl-CoA carboxylase levels. The coconut oil diet increased oxidative stress. Myocardial triglycerides and free fatty acids were lower (p < 0.05) in coconut oil mice. In conclusion, coconut oil aggravates pressure overload-induced cardiomyopathy.
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Affiliation(s)
- Ilayaraja Muthuramu
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, Leuven 3000, Belgium.
| | - Ruhul Amin
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, Leuven 3000, Belgium.
| | - Andrey Postnov
- Nuclear Medicine & Molecular Imaging, Department of Imaging & Pathology, Catholic University of Leuven, Leuven 3000, Belgium.
| | - Mudit Mishra
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, Leuven 3000, Belgium.
| | - Frank Jacobs
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, Leuven 3000, Belgium.
| | - Olivier Gheysens
- Nuclear Medicine & Molecular Imaging, Department of Imaging & Pathology, Catholic University of Leuven, Leuven 3000, Belgium.
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, Catholic University of Leuven, Leuven 3000, Belgium.
| | - Bart De Geest
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, Catholic University of Leuven, Leuven 3000, Belgium.
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28
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Mezzar S, De Schryver E, Asselberghs S, Meyhi E, Morvay PL, Baes M, Van Veldhoven PP. Phytol-induced pathology in 2-hydroxyacyl-CoA lyase (HACL1) deficient mice. Evidence for a second non-HACL1-related lyase. Biochim Biophys Acta Mol Cell Biol Lipids 2017. [PMID: 28629946 DOI: 10.1016/j.bbalip.2017.06.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
2-Hydroxyacyl-CoA lyase (HACL1) is a key enzyme of the peroxisomal α-oxidation of phytanic acid. To better understand its role in health and disease, a mouse model lacking HACL1 was investigated. Under normal conditions, these mice did not display a particular phenotype. However, upon dietary administration of phytol, phytanic acid accumulated in tissues, mainly in liver and serum of KO mice. As a consequence of phytanic acid (or a metabolite) toxicity, KO mice displayed a significant weight loss, absence of abdominal white adipose tissue, enlarged and mottled liver and reduced hepatic glycogen and triglycerides. In addition, hepatic PPARα was activated. The central nervous system of the phytol-treated mice was apparently not affected. In addition, 2OH-FA did not accumulate in the central nervous system of HACL1 deficient mice, likely due to the presence in the endoplasmic reticulum of an alternate HACL1-unrelated lyase. The latter may serve as a backup system in certain tissues and account for the formation of pristanic acid in the phytol-fed KO mice. As the degradation of pristanic acid is also impaired, both phytanoyl- and pristanoyl-CoA levels are increased in liver, and the ω-oxidized metabolites are excreted in urine. In conclusion, HACL1 deficiency is not associated with a severe phenotype, but in combination with phytanic acid intake, the normal situation in man, it might present with phytanic acid elevation and resemble a Refsum like disorder.
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Affiliation(s)
- Serena Mezzar
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Belgium
| | - Evelyn De Schryver
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Belgium
| | - Stanny Asselberghs
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Belgium
| | - Els Meyhi
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Belgium
| | - Petruta L Morvay
- LIPIT, Department of Cellular and Molecular Medicine, KU Leuven, Belgium
| | - Myriam Baes
- Laboratory for Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Belgium
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29
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Morvay PL, Baes M, Van Veldhoven PP. Differential activities of peroxisomes along the mouse intestinal epithelium. Cell Biochem Funct 2017; 35:144-155. [PMID: 28370438 DOI: 10.1002/cbf.3255] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 01/10/2017] [Accepted: 01/26/2017] [Indexed: 02/01/2023]
Abstract
The presence of peroxisomes in mammalian intestine has been revealed formerly by catalase staining combined with electron microscopy. Despite the central role of intestine in lipid uptake and the established importance of peroxisomes in different lipid-related pathways, few data are available on the physiological role of peroxisomes in intestinal metabolism, more specifically, α-, β-oxidation, and etherlipid synthesis. Hence, the peroxisomal compartment was analyzed in more detail in mouse intestine. On the basis of immunohistochemistry, the organelles are mainly confined to the epithelial cells. The expression of the classical peroxisome marker catalase was highest in the proximal part of jejunum and decreased along the tract. PEX14 showed a similar profile, but was still substantial expressed in large intestinal epithelium. Immunoblotting of epithelial cells, isolated from the different segments, showed also such gradient for some enzymes, ie, catalase, ACOX1, and D-specific multifunctional protein 2, and for the ABCD1 transporter, being high in small and low or absent in large intestine. Other peroxisomal enzymes (PHYH, HACL1, and ACAA1), the ABCD2 and ABCD3 transporters, and peroxins PEX13 and PEX14, however, did not follow this pattern, displaying rather constant signals throughout the intestinal epithelium. The small intestine displayed the highest peroxisomal β-oxidation activity and is particularly active on dicarboxylic acids. Etherlipid synthesis was high in the large intestine, and colonic cells had the highest content of plasmalogens. Overall, these data suggest that peroxisomes exert different functions according to the intestinal segment.
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Affiliation(s)
- Petruta L Morvay
- Lipid Biochemistry and Protein Interactions (LIPIT), KU Leuven, Leuven, Belgium
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30
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Jenkins BJ, Seyssel K, Chiu S, Pan PH, Lin SY, Stanley E, Ament Z, West JA, Summerhill K, Griffin JL, Vetter W, Autio KJ, Hiltunen K, Hazebrouck S, Stepankova R, Chen CJ, Alligier M, Laville M, Moore M, Kraft G, Cherrington A, King S, Krauss RM, de Schryver E, Van Veldhoven PP, Ronis M, Koulman A. Odd Chain Fatty Acids; New Insights of the Relationship Between the Gut Microbiota, Dietary Intake, Biosynthesis and Glucose Intolerance. Sci Rep 2017; 7:44845. [PMID: 28332596 PMCID: PMC5362956 DOI: 10.1038/srep44845] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 02/14/2017] [Indexed: 02/03/2023] Open
Abstract
Recent findings have shown an inverse association between circulating C15:0/C17:0 fatty acids with disease risk, therefore, their origin needs to be determined to understanding their role in these pathologies. Through combinations of both animal and human intervention studies, we comprehensively investigated all possible contributions of these fatty acids from the gut-microbiota, the diet, and novel endogenous biosynthesis. Investigations included an intestinal germ-free study and a C15:0/C17:0 diet dose response study. Endogenous production was assessed through: a stearic acid infusion, phytol supplementation, and a Hacl1−/− mouse model. Two human dietary intervention studies were used to translate the results. Finally, a study comparing baseline C15:0/C17:0 with the prognosis of glucose intolerance. We found that circulating C15:0/C17:0 levels were not influenced by the gut-microbiota. The dose response study showed C15:0 had a linear response, however C17:0 was not directly correlated. The phytol supplementation only decreased C17:0. Stearic acid infusion only increased C17:0. Hacl1−/− only decreased C17:0. The glucose intolerance study showed only C17:0 correlated with prognosis. To summarise, circulating C15:0 and C17:0 are independently derived; C15:0 correlates directly with dietary intake, while C17:0 is substantially biosynthesized, therefore, they are not homologous in the aetiology of metabolic disease. Our findings emphasize the importance of the biosynthesis of C17:0 and recognizing its link with metabolic disease.
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Affiliation(s)
- Benjamin J Jenkins
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge, CB1 9NL. Affiliated with the University of Cambridge, United Kingdom
| | - Kevin Seyssel
- Lyon University, INSERM U1060, CarMeN Laboratory and CENS, Claude Bernard University, CRNH Rhône-Alpes, Centre Hospitalier Lyon-Sud, 69310, Pierre-Bénite, France
| | - Sally Chiu
- Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland, CA 94609, United States of America
| | - Pin-Ho Pan
- Department of Pediatrics, Tungs' Taichung MetroHarbor Hospital, Taichung 435, Taiwan
| | - Shih-Yi Lin
- Division of Endocrinology and Metabolism/Center for Geriatrics and Gerontology, Taichung Veterans General Hospital, No. 1650, Sec. 4, Taiwan Boulevard, Taichung 407, Taiwan
| | - Elizabeth Stanley
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge, CB1 9NL. Affiliated with the University of Cambridge, United Kingdom
| | - Zsuzsanna Ament
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge, CB1 9NL. Affiliated with the University of Cambridge, United Kingdom
| | - James A West
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge, CB1 9NL. Affiliated with the University of Cambridge, United Kingdom
| | - Keith Summerhill
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge, CB1 9NL. Affiliated with the University of Cambridge, United Kingdom
| | - Julian L Griffin
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge, CB1 9NL. Affiliated with the University of Cambridge, United Kingdom
| | - Walter Vetter
- University of Hohenheim, Institute of Food Chemistry, Garbenstrasse 28, D-70599 Stuttgart, Germany
| | - Kaija J Autio
- Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, P.O. Box 5400, FI-90014, Finland
| | - Kalervo Hiltunen
- Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, P.O. Box 5400, FI-90014, Finland
| | - Stéphane Hazebrouck
- UMR CEA-INRA Service de Pharmacologie et d'Immunoanalyse, Laboratoire d'Immuno-Allergie Alimentaire, Université Paris-Saclay, F-91991 Gif-sur-Yvette, France
| | - Renata Stepankova
- Laboratory of Gnotobiology, Institute of Microbiology, Czech Academy of Science, Novy Hradek, 549 22, Prague, Czech Republic
| | - Chun-Jung Chen
- Department of Medical Research, Taichung Veterans General Hospital, No. 1650, Sec.4, Taiwan Boulevard, Taichung 407, Taiwan
| | - Maud Alligier
- Lyon University, INSERM U1060, CarMeN Laboratory and CENS, Claude Bernard University, CRNH Rhône-Alpes, Centre Hospitalier Lyon-Sud, 69310, Pierre-Bénite, France
| | - Martine Laville
- Lyon University, INSERM U1060, CarMeN Laboratory and CENS, Claude Bernard University, CRNH Rhône-Alpes, Centre Hospitalier Lyon-Sud, 69310, Pierre-Bénite, France
| | - Mary Moore
- 702 Light Hall, Dept. of Molecular Physiology &Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0615, United States of America
| | - Guillaume Kraft
- 702 Light Hall, Dept. of Molecular Physiology &Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0615, United States of America
| | - Alan Cherrington
- 702 Light Hall, Dept. of Molecular Physiology &Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0615, United States of America
| | - Sarah King
- Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland, CA 94609, United States of America
| | - Ronald M Krauss
- Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland, CA 94609, United States of America
| | - Evelyn de Schryver
- Laboratory of Lipid Biochemistry and Protein Interactions (LIPIT), Campus Gasthuisberg - KU Leuven, Herestraat Box 601, B-3000 Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions (LIPIT), Campus Gasthuisberg - KU Leuven, Herestraat Box 601, B-3000 Leuven, Belgium
| | - Martin Ronis
- College of Medicine, Department of Pharmacology &Experimental Therapeutics, Louisiana State University Health Sciences Centre 1901 Perdido Str., New Orleans, United States of America
| | - Albert Koulman
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge, CB1 9NL. Affiliated with the University of Cambridge, United Kingdom.,NIHR BRC Core Metabolomics and Lipidomics Laboratory, Level 4, Laboratory Block, Cambridge University Hospitals, University of Cambridge, Cambridge, UK
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31
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Prasad R, Hadjidemetriou I, Maharaj A, Meimaridou E, Buonocore F, Saleem M, Hurcombe J, Bierzynska A, Barbagelata E, Bergadá I, Cassinelli H, Das U, Krone R, Hacihamdioglu B, Sari E, Yesilkaya E, Storr HL, Clemente M, Fernandez-Cancio M, Camats N, Ram N, Achermann JC, Van Veldhoven PP, Guasti L, Braslavsky D, Guran T, Metherell LA. Sphingosine-1-phosphate lyase mutations cause primary adrenal insufficiency and steroid-resistant nephrotic syndrome. J Clin Invest 2017; 127:942-953. [PMID: 28165343 PMCID: PMC5330744 DOI: 10.1172/jci90171] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 12/12/2016] [Indexed: 12/26/2022] Open
Abstract
Primary adrenal insufficiency is life threatening and can present alone or in combination with other comorbidities. Here, we have described a primary adrenal insufficiency syndrome and steroid-resistant nephrotic syndrome caused by loss-of-function mutations in sphingosine-1-phosphate lyase (SGPL1). SGPL1 executes the final decisive step of the sphingolipid breakdown pathway, mediating the irreversible cleavage of the lipid-signaling molecule sphingosine-1-phosphate (S1P). Mutations in other upstream components of the pathway lead to harmful accumulation of lysosomal sphingolipid species, which are associated with a series of conditions known as the sphingolipidoses. In this work, we have identified 4 different homozygous mutations, c.665G>A (p.R222Q), c.1633_1635delTTC (p.F545del), c.261+1G>A (p.S65Rfs*6), and c.7dupA (p.S3Kfs*11), in 5 families with the condition. In total, 8 patients were investigated, some of whom also manifested other features, including ichthyosis, primary hypothyroidism, neurological symptoms, and cryptorchidism. Sgpl1-/- mice recapitulated the main characteristics of the human disease with abnormal adrenal and renal morphology. Sgpl1-/- mice displayed disrupted adrenocortical zonation and defective expression of steroidogenic enzymes as well as renal histology in keeping with a glomerular phenotype. In summary, we have identified SGPL1 mutations in humans that perhaps represent a distinct multisystemic disorder of sphingolipid metabolism.
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Affiliation(s)
- Rathi Prasad
- Centre for Endocrinology, William Harvey Research Institute, John Vane Science Centre, Queen Mary, University of London, Charterhouse Square, London, United Kingdom
| | - Irene Hadjidemetriou
- Centre for Endocrinology, William Harvey Research Institute, John Vane Science Centre, Queen Mary, University of London, Charterhouse Square, London, United Kingdom
| | - Avinaash Maharaj
- Centre for Endocrinology, William Harvey Research Institute, John Vane Science Centre, Queen Mary, University of London, Charterhouse Square, London, United Kingdom
| | - Eirini Meimaridou
- Centre for Endocrinology, William Harvey Research Institute, John Vane Science Centre, Queen Mary, University of London, Charterhouse Square, London, United Kingdom
| | - Federica Buonocore
- Genetics and Genomic Medicine, UCL Great Ormond Street Institute of Child Health, University College London, London, United Kingdom
| | - Moin Saleem
- Children’s and Academic Renal Unit, University of Bristol, Bristol, United Kingdom
| | - Jenny Hurcombe
- Children’s and Academic Renal Unit, University of Bristol, Bristol, United Kingdom
| | - Agnieszka Bierzynska
- Children’s and Academic Renal Unit, University of Bristol, Bristol, United Kingdom
| | - Eliana Barbagelata
- Servicio de Nefrología, Hospital de Niños “Ricardo Gutiérrez,” Buenos Aires, Argentina
| | - Ignacio Bergadá
- Centro de Investigaciones Endocrinológicas “Dr. Cesar Bergadá” (CEDIE) – CONICET – FEI – División de Endocrinología, Hospital de Niños “Ricardo Gutiérrez,” Buenos Aires, Argentina
| | - Hamilton Cassinelli
- Centro de Investigaciones Endocrinológicas “Dr. Cesar Bergadá” (CEDIE) – CONICET – FEI – División de Endocrinología, Hospital de Niños “Ricardo Gutiérrez,” Buenos Aires, Argentina
| | - Urmi Das
- Alderhey Children’s Hospital NHS Foundation Trust, Eaton Road, Liverpool, United Kingdom
| | - GOSgene
- Genetics and Genomic Medicine, UCL Great Ormond Street Institute of Child Health, University College London, London, United Kingdom
- The center is detailed in the Supplemental Acknowledgments
| | - Ruth Krone
- Birmingham Children’s Hospital, Birmingham, United Kingdom
| | - Bulent Hacihamdioglu
- Health Sciences University, Suleymaniye Maternity and Children’s Training and Research Hospital, Department of Paediatric Endocrinology and Diabetes, Istanbul, Turkey
| | - Erkan Sari
- Gulhane Military Medical School Department of Paediatric Endocrinology and Diabetes, Ankara, Turkey
| | - Ediz Yesilkaya
- Gulhane Military Medical School Department of Paediatric Endocrinology and Diabetes, Ankara, Turkey
| | - Helen L. Storr
- Centre for Endocrinology, William Harvey Research Institute, John Vane Science Centre, Queen Mary, University of London, Charterhouse Square, London, United Kingdom
| | - Maria Clemente
- Growth and Development Research Unit, Vall d’Hebron Research Institute (VHIR), Hospital Vall d’Hebron, CIBERER, Instituto de Salud Carlos III, Barcelona, Spain
| | - Monica Fernandez-Cancio
- Growth and Development Research Unit, Vall d’Hebron Research Institute (VHIR), Hospital Vall d’Hebron, CIBERER, Instituto de Salud Carlos III, Barcelona, Spain
| | - Nuria Camats
- Growth and Development Research Unit, Vall d’Hebron Research Institute (VHIR), Hospital Vall d’Hebron, CIBERER, Instituto de Salud Carlos III, Barcelona, Spain
| | - Nanik Ram
- Department of Medicine, Aga Khan University Hospital, Karachi, Pakistan
| | - John C. Achermann
- Genetics and Genomic Medicine, UCL Great Ormond Street Institute of Child Health, University College London, London, United Kingdom
| | - Paul P. Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions (LIPIT), Campus Gasthuisberg, KU Leuven, Leuven, Belgium
| | - Leonardo Guasti
- Centre for Endocrinology, William Harvey Research Institute, John Vane Science Centre, Queen Mary, University of London, Charterhouse Square, London, United Kingdom
| | - Debora Braslavsky
- Centro de Investigaciones Endocrinológicas “Dr. Cesar Bergadá” (CEDIE) – CONICET – FEI – División de Endocrinología, Hospital de Niños “Ricardo Gutiérrez,” Buenos Aires, Argentina
| | - Tulay Guran
- Marmara University, Department of Paediatric Endocrinology and Diabetes, Istanbul, Turkey
| | - Louise A. Metherell
- Centre for Endocrinology, William Harvey Research Institute, John Vane Science Centre, Queen Mary, University of London, Charterhouse Square, London, United Kingdom
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32
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Alecu I, Tedeschi A, Behler N, Wunderling K, Lamberz C, Lauterbach MAR, Gaebler A, Ernst D, Van Veldhoven PP, Al-Amoudi A, Latz E, Othman A, Kuerschner L, Hornemann T, Bradke F, Thiele C, Penno A. Localization of 1-deoxysphingolipids to mitochondria induces mitochondrial dysfunction. J Lipid Res 2016; 58:42-59. [PMID: 27881717 DOI: 10.1194/jlr.m068676] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 10/27/2016] [Indexed: 12/20/2022] Open
Abstract
1-Deoxysphingolipids (deoxySLs) are atypical sphingolipids that are elevated in the plasma of patients with type 2 diabetes and hereditary sensory and autonomic neuropathy type 1 (HSAN1). Clinically, diabetic neuropathy and HSAN1 are very similar, suggesting the involvement of deoxySLs in the pathology of both diseases. However, very little is known about the biology of these lipids and the underlying pathomechanism. We synthesized an alkyne analog of 1-deoxysphinganine (doxSA), the metabolic precursor of all deoxySLs, to trace the metabolism and localization of deoxySLs. Our results indicate that the metabolism of these lipids is restricted to only some lipid species and that they are not converted to canonical sphingolipids or fatty acids. Furthermore, exogenously added alkyne-doxSA [(2S,3R)-2-aminooctadec-17-yn-3-ol] localized to mitochondria, causing mitochondrial fragmentation and dysfunction. The induced mitochondrial toxicity was also shown for natural doxSA, but not for sphinganine, and was rescued by inhibition of ceramide synthase activity. Our findings therefore indicate that mitochondrial enrichment of an N-acylated doxSA metabolite may contribute to the neurotoxicity seen in diabetic neuropathy and HSAN1. Hence, we provide a potential explanation for the characteristic vulnerability of peripheral nerves to elevated levels of deoxySLs.
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Affiliation(s)
- Irina Alecu
- Institute for Clinical Chemistry, University of Zurich, Zurich, Switzerland.,Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Andrea Tedeschi
- Axonal Growth and Regeneration, German Center for Neurodegenerative Diseases, Bonn, Germany
| | - Natascha Behler
- LIMES Life and Medical Sciences Institute, University of Bonn, Bonn, Germany
| | - Klaus Wunderling
- LIMES Life and Medical Sciences Institute, University of Bonn, Bonn, Germany
| | - Christian Lamberz
- Cyro-Electron Microscopy and Tomography, German Center for Neurodegenerative Diseases, Bonn, Germany
| | | | - Anne Gaebler
- LIMES Life and Medical Sciences Institute, University of Bonn, Bonn, Germany
| | - Daniela Ernst
- Institute for Clinical Chemistry, University of Zurich, Zurich, Switzerland
| | - Paul P Van Veldhoven
- Laboratory for Lipid Biochemistry and Protein Interactions, Campus Gasthuisberg, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Ashraf Al-Amoudi
- Cyro-Electron Microscopy and Tomography, German Center for Neurodegenerative Diseases, Bonn, Germany
| | - Eicke Latz
- Institute of Innate Immunity, University Hospital Bonn, Bonn, Germany
| | - Alaa Othman
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Lars Kuerschner
- LIMES Life and Medical Sciences Institute, University of Bonn, Bonn, Germany
| | - Thorsten Hornemann
- Institute for Clinical Chemistry, University of Zurich, Zurich, Switzerland.,Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Frank Bradke
- Axonal Growth and Regeneration, German Center for Neurodegenerative Diseases, Bonn, Germany
| | - Christoph Thiele
- LIMES Life and Medical Sciences Institute, University of Bonn, Bonn, Germany
| | - Anke Penno
- LIMES Life and Medical Sciences Institute, University of Bonn, Bonn, Germany
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33
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Nordgren M, Francisco T, Lismont C, Hennebel L, Brees C, Wang B, Van Veldhoven PP, Azevedo JE, Fransen M. Export-deficient monoubiquitinated PEX5 triggers peroxisome removal in SV40 large T antigen-transformed mouse embryonic fibroblasts. Autophagy 2016; 11:1326-40. [PMID: 26086376 DOI: 10.1080/15548627.2015.1061846] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Peroxisomes are ubiquitous cell organelles essential for human health. To maintain a healthy cellular environment, dysfunctional and superfluous peroxisomes need to be selectively removed. Although emerging evidence suggests that peroxisomes are mainly degraded by pexophagy, little is known about the triggers and molecular mechanisms underlying this process in mammalian cells. In this study, we show that PEX5 proteins fused to a bulky C-terminal tag trigger peroxisome degradation in SV40 large T antigen-transformed mouse embryonic fibroblasts. In addition, we provide evidence that this process is autophagy-dependent and requires monoubiquitination of the N-terminal cysteine residue that marks PEX5 for recycling. As our findings also demonstrate that the addition of a bulky tag to the C terminus of PEX5 does not interfere with PEX5 monoubiquitination but strongly inhibits its export from the peroxisomal membrane, we hypothesize that such a tag mimics a cargo protein that cannot be released from PEX5, thus keeping monoubiquitinated PEX5 at the membrane for a sufficiently long time to be recognized by the autophagic machinery. This in turn suggests that monoubiquitination of the N-terminal cysteine of peroxisome-associated PEX5 not only functions to recycle the peroxin back to the cytosol, but also serves as a quality control mechanism to eliminate peroxisomes with a defective protein import machinery.
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Affiliation(s)
- Marcus Nordgren
- a Laboratory of Lipid Biochemistry and Protein Interactions; Department of Cellular and Molecular Medicine; University of Leuven - KU Leuven ; Leuven , Belgium
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34
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Wouters MM, Balemans D, Van Wanrooy S, Dooley J, Cibert-Goton V, Alpizar YA, Valdez-Morales EE, Nasser Y, Van Veldhoven PP, Vanbrabant W, Van der Merwe S, Mols R, Ghesquière B, Cirillo C, Kortekaas I, Carmeliet P, Peetermans WE, Vermeire S, Rutgeerts P, Augustijns P, Hellings PW, Belmans A, Vanner S, Bulmer DC, Talavera K, Vanden Berghe P, Liston A, Boeckxstaens GE. Histamine Receptor H1-Mediated Sensitization of TRPV1 Mediates Visceral Hypersensitivity and Symptoms in Patients With Irritable Bowel Syndrome. Gastroenterology 2016; 150:875-87.e9. [PMID: 26752109 DOI: 10.1053/j.gastro.2015.12.034] [Citation(s) in RCA: 218] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 12/08/2015] [Accepted: 12/22/2015] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS Histamine sensitizes the nociceptor transient reporter potential channel V1 (TRPV1) and has been shown to contribute to visceral hypersensitivity in animals. We investigated the role of TRPV1 in irritable bowel syndrome (IBS) and evaluated if an antagonist of histamine receptor H1 (HRH1) could reduce symptoms of patients in a randomized placebo-controlled trial. METHODS By using live calcium imaging, we compared activation of submucosal neurons by the TRPV1 agonist capsaicin in rectal biopsy specimens collected from 9 patients with IBS (ROME 3 criteria) and 15 healthy subjects. The sensitization of TRPV1 by histamine, its metabolite imidazole acetaldehyde, and supernatants from biopsy specimens was assessed by calcium imaging of mouse dorsal root ganglion neurons. We then performed a double-blind trial of patients with IBS (mean age, 31 y; range, 18-65 y; 34 female). After a 2-week run-in period, subjects were assigned randomly to groups given either the HRH1 antagonist ebastine (20 mg/day; n = 28) or placebo (n = 27) for 12 weeks. Rectal biopsy specimens were collected, barostat studies were performed, and symptoms were assessed (using the validated gastrointestinal symptom rating scale) before and after the 12-week period. Patients were followed up for an additional 2 weeks. Abdominal pain, symptom relief, and health-related quality of life were assessed on a weekly basis. The primary end point of the study was the effect of ebastine on the symptom score evoked by rectal distension. RESULTS TRPV1 responses of submucosal neurons from patients with IBS were potentiated compared with those of healthy volunteers. Moreover, TRPV1 responses of submucosal neurons from healthy volunteers could be potentiated by their pre-incubation with histamine; this effect was blocked by the HRH1 antagonist pyrilamine. Supernatants from rectal biopsy specimens from patients with IBS, but not from the healthy volunteers, sensitized TRPV1 in mouse nociceptive dorsal root ganglion neurons via HRH1; this effect could be reproduced by histamine and imidazole acetaldehyde. Compared with subjects given placebo, those given ebastine had reduced visceral hypersensitivity, increased symptom relief (ebastine 46% vs placebo 13%; P = .024), and reduced abdominal pain scores (ebastine 39 ± 23 vs placebo 62 ± 22; P = .0004). CONCLUSIONS In studies of rectal biopsy specimens from patients, we found that HRH1-mediated sensitization of TRPV1 is involved in IBS. Ebastine, an antagonist of HRH1, reduced visceral hypersensitivity, symptoms, and abdominal pain in patients with IBS. Inhibitors of this pathway might be developed as a new treatment approach for IBS. ClinicalTrials.gov no: NCT01144832.
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Affiliation(s)
- Mira M Wouters
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Dafne Balemans
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Sander Van Wanrooy
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - James Dooley
- Autoimmune Genetics Laboratory, Flemish Institute for Biotechnology (VIB) and Department of Microbiology and Immunology, KU Leuven, Leuven, Belgium
| | - Vincent Cibert-Goton
- National Centre for Bowel Research and Surgical Innovation, Centre for Neuroscience and Trauma, Blizard Institute, Bart's and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Yeranddy A Alpizar
- Department of Cellular and Molecular Medicine, Laboratory of Ion Channel Research and Transient Receptor Potential (TRP) channel Research Platform, KU Leuven, Leuven, Belgium
| | - Eduardo E Valdez-Morales
- Gastrointestinal Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Canada
| | - Yasmin Nasser
- Gastrointestinal Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Canada
| | - Paul P Van Veldhoven
- Department of Cellular and Molecular Medicine, Laboratory of Lipid Biochemistry and Protein-Interaction, KU Leuven, Leuven, Belgium
| | - Winde Vanbrabant
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Schalk Van der Merwe
- Department of Clinical and Experimental Medicine, Hepatology, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Raf Mols
- Department of Pharmaceutical and Pharmacological Sciences, Drug Delivery and Disposition, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Bart Ghesquière
- Laboratory of Angiogenesis and Neurovascular Link (Vesalius Research Center), KU Leuven, Leuven, Belgium
| | - Carla Cirillo
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Inge Kortekaas
- Department of Microbiology and Immunology, Laboratory of Clinical Immunology, KU Leuven, Leuven, Belgium
| | - Peter Carmeliet
- Laboratory of Angiogenesis and Neurovascular Link (Vesalius Research Center), KU Leuven, Leuven, Belgium
| | - Willy E Peetermans
- Department of Internal Medicine, Laboratory for Clinical Infectious and Inflammatory Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Séverine Vermeire
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Paul Rutgeerts
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Patrick Augustijns
- Department of Pharmaceutical and Pharmacological Sciences, Drug Delivery and Disposition, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Peter W Hellings
- Department of Microbiology and Immunology, Laboratory of Clinical Immunology, KU Leuven, Leuven, Belgium; Department of Otorhinolaryngology, Academic Medical Center Amsterdam, Amsterdam, The Netherlands; Department of Otorhinolaryngology, University of Ghent, Ghent, Belgium
| | - Ann Belmans
- Department of Biostatistics and Centre of Statistical Bioinformatics, KU Leuven, Leuven, Belgium
| | - Stephen Vanner
- Gastrointestinal Diseases Research Unit, Kingston General Hospital, Queen's University, Kingston, Canada
| | - David C Bulmer
- National Centre for Bowel Research and Surgical Innovation, Centre for Neuroscience and Trauma, Blizard Institute, Bart's and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Karel Talavera
- Department of Cellular and Molecular Medicine, Laboratory of Ion Channel Research and Transient Receptor Potential (TRP) channel Research Platform, KU Leuven, Leuven, Belgium
| | - Pieter Vanden Berghe
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium
| | - Adrian Liston
- Autoimmune Genetics Laboratory, Flemish Institute for Biotechnology (VIB) and Department of Microbiology and Immunology, KU Leuven, Leuven, Belgium
| | - Guy E Boeckxstaens
- Department of Clinical and Experimental Medicine, Translational Research Center for Gastrointestinal Disorders, University Hospital Leuven, KU Leuven, Leuven, Belgium.
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35
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Haberkant P, Stein F, Höglinger D, Gerl MJ, Brügger B, Van Veldhoven PP, Krijgsveld J, Gavin AC, Schultz C. Bifunctional Sphingosine for Cell-Based Analysis of Protein-Sphingolipid Interactions. ACS Chem Biol 2016; 11:222-30. [PMID: 26555438 DOI: 10.1021/acschembio.5b00810] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sphingolipids are essential structural components of cellular membranes and are crucial regulators of cellular processes. While current high-throughput approaches allow for the systematic mapping of interactions of soluble proteins with their lipid-binding partners, photo-cross-linking is the only technique that enables for the proteome-wide mapping of integral membrane proteins with their direct lipid environment. Here, we report the synthesis of a photoactivatable and clickable analog of sphingosine (pacSph). When administered to sphingosine-1-phosphate lyase deficient cells, pacSph allows its metabolic fate and the subcellular flux of de novo synthesized sphingolipids to be followed in a time-resolved manner. The chemoproteomic profiling yielded over 180 novel sphingolipid-binding proteins, of which we validated a number, demonstrating the unique value of this technique as a discovery tool. This work provides an important resource for the understanding of the global cellular interplay between sphingolipids and their interacting proteins.
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Affiliation(s)
- Per Haberkant
- European Molecular Biology Laboratory, Cell Biology
and Biophysics Unit, Meyerhofstr.
1, 69117 Heidelberg, Germany
| | - Frank Stein
- European Molecular Biology Laboratory, Cell Biology
and Biophysics Unit, Meyerhofstr.
1, 69117 Heidelberg, Germany
| | - Doris Höglinger
- European Molecular Biology Laboratory, Cell Biology
and Biophysics Unit, Meyerhofstr.
1, 69117 Heidelberg, Germany
| | - Mathias J. Gerl
- Heidelberg University Biochemistry Center, Im Neuenheimer Feld 328, 69120 Heidelberg, Germany
| | - Britta Brügger
- Heidelberg University Biochemistry Center, Im Neuenheimer Feld 328, 69120 Heidelberg, Germany
| | - Paul P. Van Veldhoven
- Laboratory
for Lipid Biochemistry and Protein Interactions, Department of Cellular
and Molecular Medicine, KU Leuven, B-3000 Leuven, Belgium
| | - Jeroen Krijgsveld
- European Molecular Biology Laboratory, Genome Biology
Unit, Meyerhofstr. 1, 69117 Heidelberg, Germany
| | - Anne-Claude Gavin
- European Molecular Biology Laboratory, Structural
and Computational Biology Unit, Meyerhofstr. 1, 69117 Heidelberg, Germany
| | - Carsten Schultz
- European Molecular Biology Laboratory, Cell Biology
and Biophysics Unit, Meyerhofstr.
1, 69117 Heidelberg, Germany
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36
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Baes M, Van Veldhoven PP. Hepatic dysfunction in peroxisomal disorders. Biochim Biophys Acta 2015; 1863:956-70. [PMID: 26453805 DOI: 10.1016/j.bbamcr.2015.09.035] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 09/25/2015] [Accepted: 09/28/2015] [Indexed: 12/18/2022]
Abstract
The peroxisomal compartment in hepatocytes hosts several essential metabolic conversions. These are defective in peroxisomal disorders that are either caused by failure to import the enzymes in the organelle or by mutations in the enzymes or in transporters needed to transfer the substrates across the peroxisomal membrane. Hepatic pathology is one of the cardinal features in disorders of peroxisome biogenesis and peroxisomal β-oxidation although it only rarely determines the clinical fate. In mouse models of these diseases liver pathologies also occur, although these are not always concordant with the human phenotype which might be due to differences in diet, expression of enzymes and backup mechanisms. Besides the morphological changes, we overview the impact of peroxisome malfunction on other cellular compartments including mitochondria and the ER. We further focus on the metabolic pathways that are affected such as bile acid formation, and dicarboxylic acid and branched chain fatty acid degradation. It appears that the association between deregulated metabolites and pathological events remains unclear.
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Affiliation(s)
- Myriam Baes
- Laboratory for Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, B-3000 Leuven, Belgium.
| | - Paul P Van Veldhoven
- Laboratory for Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven, B-3000 Leuven, Belgium.
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37
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Kariminejad A, Nafissi S, Nilipoor Y, Tavasoli A, Van Veldhoven PP, Bonnard C, Ng YT, Majoie CB, Reversade B, Hennekam RC. Intellectual disability, muscle weakness and characteristic face in three siblings: A newly described recessive syndrome mapping to 3p24.3-p25.3. Am J Med Genet A 2015; 167A:2508-15. [PMID: 26192890 DOI: 10.1002/ajmg.a.37248] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 06/28/2015] [Indexed: 01/26/2023]
Abstract
We report on a sister and two brothers born to healthy Iranian parents with mild intellectual disability, progressive muscle weakness, and characteristic facies. including highly arched eyebrows, down-slanting palpebral fissures, prominent nasal bridge, prominent nose, columella extending below alae nasi, narrow mouth, narrow palate, and dental caries, and in one of them an inability to abduct the left eye. Electrophysiological studies showed signs of myopathy, and muscle biopsies demonstrated only nonspecific signs. Brain MRIs in two of the sibs showed leukencephalopathy with delayed myelination, frontal and parietal hyperintensities, and hippocampal atrophy in one. We have been unable to find a description of this association of features in literature. Based on the occurrence in siblings, no significant difference in phenotype between the brothers and sister, absence of manifestations in parents, and a likely consanguinity between parents we performed a homozygosity mapping. A single identical-by-descent bloc encompassing 57 genes located at 3p24.3-p25.3 was found to segregate within the family with this phenotype. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
| | - Shahriar Nafissi
- Department of Neurology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Yalda Nilipoor
- Pediatric Pathology Research Center, Mofid Children's Hospital, Shahid Beheshti Medical University, Tehran, Iran
| | - Alireza Tavasoli
- Department of Pediatric Neurology, Pediatrics Centre of Excellence, Children's Medical Centre, Tehran University of Medical Sciences, Tehran, Iran
| | | | | | | | - Charles B Majoie
- Department of Radiology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | | | - Raoul C Hennekam
- Department of Pediatrics, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
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38
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Crick PJ, Beckers L, Baes M, Van Veldhoven PP, Wang Y, Griffiths WJ. The oxysterol and cholestenoic acid profile of mouse cerebrospinal fluid. Steroids 2015; 99:172-7. [PMID: 25759118 PMCID: PMC4503871 DOI: 10.1016/j.steroids.2015.02.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 02/17/2015] [Accepted: 02/20/2015] [Indexed: 01/19/2023]
Abstract
Oxysterols and cholestenoic acids are oxidised forms of cholesterol with a host of biological functions. The possible roles of oxysterols in various neurological diseases makes the analysis of these metabolites in the central nervous system of particular interest. Here, we report the identification and quantification of a panel of twelve sterols in mouse cerebrospinal fluid (CSF) using liquid chromatography-mass spectrometry exploiting enzyme assisted derivatisation for sterol analysis technology. We found low levels of oxysterols and cholestenoic acids in CSF in the range of 5pg/mL-2.6ng/mL. As found in man, these concentrations are one to two orders of magnitude lower than in plasma.
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Affiliation(s)
- Peter J Crick
- College of Medicine, Grove Building, Swansea University, Singleton Park, Swansea SA2 8PP, UK
| | - Lien Beckers
- Department of Pharmaceutical and Pharmacological Sciences, Laboratory of Cell Metabolism, Campus Gasthuisberg O/N2, B 3000 Leuven, Belgium
| | - Myriam Baes
- Department of Pharmaceutical and Pharmacological Sciences, Laboratory of Cell Metabolism, Campus Gasthuisberg O/N2, B 3000 Leuven, Belgium
| | - Paul P Van Veldhoven
- Department of Cellular and Molecular Medicine, LIPIT, Campus Gasthuisberg O&N1, B3000 Leuven, Belgium
| | - Yuqin Wang
- College of Medicine, Grove Building, Swansea University, Singleton Park, Swansea SA2 8PP, UK.
| | - William J Griffiths
- College of Medicine, Grove Building, Swansea University, Singleton Park, Swansea SA2 8PP, UK.
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39
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Abstract
Reduction-oxidation or “redox” reactions are an integral part of a broad range of cellular processes such as gene expression, energy metabolism, protein import and folding, and autophagy. As many of these processes are intimately linked with cell fate decisions, transient or chronic changes in cellular redox equilibrium are likely to contribute to the initiation and progression of a plethora of human diseases. Since a long time, it is known that mitochondria are major players in redox regulation and signaling. More recently, it has become clear that also peroxisomes have the capacity to impact redox-linked physiological processes. To serve this function, peroxisomes cooperate with other organelles, including mitochondria. This review provides a comprehensive picture of what is currently known about the redox interplay between mitochondria and peroxisomes in mammals. We first outline the pro- and antioxidant systems of both organelles and how they may function as redox signaling nodes. Next, we critically review and discuss emerging evidence that peroxisomes and mitochondria share an intricate redox-sensitive relationship and cooperate in cell fate decisions. Key issues include possible physiological roles, messengers, and mechanisms. We also provide examples of how data mining of publicly-available datasets from “omics” technologies can be a powerful means to gain additional insights into potential redox signaling pathways between peroxisomes and mitochondria. Finally, we highlight the need for more studies that seek to clarify the mechanisms of how mitochondria may act as dynamic receivers, integrators, and transmitters of peroxisome-derived mediators of oxidative stress. The outcome of such studies may open up exciting new avenues for the community of researchers working on cellular responses to organelle-derived oxidative stress, a research field in which the role of peroxisomes is currently highly underestimated and an issue of discussion.
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Affiliation(s)
- Celien Lismont
- Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven - University of Leuven Leuven, Belgium
| | - Marcus Nordgren
- Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven - University of Leuven Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven - University of Leuven Leuven, Belgium
| | - Marc Fransen
- Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU Leuven - University of Leuven Leuven, Belgium
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40
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Verbeek J, Lannoo M, Pirinen E, Ryu D, Spincemaille P, Vander Elst I, Windmolders P, Thevissen K, Cammue BPA, van Pelt J, Fransis S, Van Eyken P, Ceuterick-De Groote C, Van Veldhoven PP, Bedossa P, Nevens F, Auwerx J, Cassiman D. Roux-en-y gastric bypass attenuates hepatic mitochondrial dysfunction in mice with non-alcoholic steatohepatitis. Gut 2015; 64:673-83. [PMID: 24917551 DOI: 10.1136/gutjnl-2014-306748] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE No therapy for non-alcoholic steatohepatitis (NASH) has been approved so far. Roux-en-y gastric bypass (RYGB) is emerging as a therapeutic option, although its effect on NASH and related hepatic molecular pathways is unclear from human studies. We studied the effect of RYGB on pre-existent NASH and hepatic mitochondrial dysfunction-a key player in NASH pathogenesis-in a novel diet-induced mouse model nicely mimicking human disease. DESIGN C57BL/6J mice were fed a high-fat high-sucrose diet (HF-HSD). RESULTS HF-HSD led to early obesity, insulin resistance and hypercholesterolaemia. HF-HSD consistently induced NASH (steatosis, hepatocyte ballooning and inflammation) with fibrosis already after 12-week feeding. NASH was accompanied by hepatic mitochondrial dysfunction, characterised by decreased mitochondrial respiratory chain (MRC) complex I and IV activity, ATP depletion, ultrastructural abnormalities, together with higher 4-hydroxynonenal (HNE) levels, increased uncoupling protein 2 (UCP2) and tumour necrosis factor-α (TNF-α) mRNA and free cholesterol accumulation. In our model of NASH and acquired mitochondrial dysfunction, RYGB induced sustained weight loss, improved insulin resistance and inhibited progression of NASH, with a marked reversal of fibrosis. In parallel, RYGB preserved hepatic MRC complex I activity, restored ATP levels, limited HNE production and decreased TNF-α mRNA. CONCLUSIONS Progression of NASH and NASH-related hepatic mitochondrial dysfunction can be prevented by RYGB. RYGB preserves respiratory chain complex activity, thereby restoring energy output, probably by limiting the amount of oxidative stress and TNF-α. These data suggest that modulation of hepatic mitochondrial function contributes to the favourable effect of RYBG on established NASH.
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Affiliation(s)
- Jef Verbeek
- Department of Hepatology, University Hospitals KU Leuven, Leuven, Belgium
| | - Matthias Lannoo
- Department of Abdominal Surgery, University Hospitals KU Leuven, Leuven, Belgium
| | - Eija Pirinen
- Laboratory for Integrative and Systems Physiology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland Departments of Biotechnology and Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, Biocenter Kuopio, University of Eastern Finland, Kuopio, Finland
| | - Dongryeol Ryu
- Laboratory for Integrative and Systems Physiology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | | | - Ingrid Vander Elst
- Department of Hepatology, University Hospitals KU Leuven, Leuven, Belgium
| | - Petra Windmolders
- Department of Hepatology, University Hospitals KU Leuven, Leuven, Belgium
| | - Karin Thevissen
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Leuven, Belgium
| | - Bruno P A Cammue
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Leuven, Belgium Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie (VIB), Ghent, Belgium
| | - Jos van Pelt
- Department of Hepatology, University Hospitals KU Leuven, Leuven, Belgium
| | - Sabine Fransis
- Department of Pathology, Ziekenhuis Oost-Limburg, Genk, Belgium
| | - Peter Van Eyken
- Department of Pathology, Ziekenhuis Oost-Limburg, Genk, Belgium
| | - Chantal Ceuterick-De Groote
- Laboratory of Ultrastructural Neuropathology, Institute Born-Bunge (IBB), University of Antwerp, Antwerp, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions, KU Leuven, Leuven, Belgium
| | - Pierre Bedossa
- Department of Pathology, Hopital Beaujon, Clichy, France
| | - Frederik Nevens
- Department of Hepatology, University Hospitals KU Leuven, Leuven, Belgium
| | - Johan Auwerx
- Laboratory for Integrative and Systems Physiology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - David Cassiman
- Department of Hepatology, University Hospitals KU Leuven, Leuven, Belgium Metabolic Center, University Hospitals KU Leuven, Leuven, Belgium
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41
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Schoors S, Bruning U, Missiaen R, Queiroz KC, Borgers G, Elia I, Zecchin A, Cantelmo AR, Christen S, Goveia J, Heggermont W, Goddé L, Vinckier S, Van Veldhoven PP, Eelen G, Schoonjans L, Gerhardt H, Dewerchin M, Baes M, De Bock K, Ghesquière B, Lunt SY, Fendt SM, Carmeliet P. Fatty acid carbon is essential for dNTP synthesis in endothelial cells. Nature 2015; 520:192-197. [PMID: 25830893 PMCID: PMC4413024 DOI: 10.1038/nature14362] [Citation(s) in RCA: 415] [Impact Index Per Article: 46.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 02/26/2015] [Indexed: 12/20/2022]
Abstract
The metabolism of endothelial cells (ECs) during vessel sprouting remains poorly studied. Here, we report that endothelial loss of CPT1a, a rate-limiting enzyme of fatty acid oxidation (FAO), caused vascular sprouting defects due to impaired proliferation, not migration of ECs. Reduction of FAO in ECs did not cause energy depletion or disturb redox homeostasis, but impaired de novo nucleotide synthesis for DNA replication. Isotope labeling studies in control ECs showed that fatty acid carbons substantially replenished the Krebs cycle, and were incorporated into aspartate (a nucleotide precursor), uridine monophosphate (a precursor of pyrimidine nucleoside triphosphates) and DNA. CPT1a silencing reduced these processes and depleted EC stores of aspartate and deoxyribonucleoside triphosphates. Acetate (metabolized to acetyl-CoA, thereby substituting for the depleted FAO-derived acetyl-CoA) or a nucleoside mix rescued the phenotype of CPT1a-silenced ECs. Finally, CPT1 blockade inhibited pathological ocular angiogenesis, suggesting a novel strategy for blocking angiogenesis.
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Affiliation(s)
- Sandra Schoors
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Ulrike Bruning
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Rindert Missiaen
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Karla Cs Queiroz
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Gitte Borgers
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Ilaria Elia
- Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Cellular Metabolism and Metabolic Regulation, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Annalisa Zecchin
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Anna Rita Cantelmo
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Stefan Christen
- Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Cellular Metabolism and Metabolic Regulation, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Jermaine Goveia
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Ward Heggermont
- Center for Molecular & Vascular Biology, KU Leuven; Division of Clinical Cardiology, UZ Leuven, B-3000, Belgium
| | - Lucica Goddé
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Stefan Vinckier
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Lipid biochemistry and protein interactions, University of Leuven, B-3000, Leuven, Belgium
| | - Guy Eelen
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Luc Schoonjans
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Holger Gerhardt
- Vascular Patterning Laboratory, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Vascular Patterning Laboratory, Vesalius Research Center, VIB, Leuven, B-3000, Belgium.,Integrative Vascular Biology Laboratory, Max Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Mieke Dewerchin
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of pharmaceutical and pharmacological sciences, University of Leuven, Leuven, B-3000,Belgium
| | - Katrien De Bock
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium.,Exercise Physiology Research Group, Department of Kinesiology, University of Leuven, Leuven, B-3001, Belgium
| | - Bart Ghesquière
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Sophia Y Lunt
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, USA
| | - Sarah-Maria Fendt
- Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Cellular Metabolism and Metabolic Regulation, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
| | - Peter Carmeliet
- Laboratory of Angiogenesis and Neurovascular link, Department of Oncology, University of Leuven, Leuven, B-3000, Belgium.,Laboratory of Angiogenesis and Neurovascular link, Vesalius Research Center, VIB, Leuven, B-3000, Belgium
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Schulz JG, Laranjeira A, Van Huffel L, Gärtner A, Vilain S, Bastianen J, Van Veldhoven PP, Dotti CG. Glial β-oxidation regulates Drosophila energy metabolism. Sci Rep 2015; 5:7805. [PMID: 25588812 PMCID: PMC4295106 DOI: 10.1038/srep07805] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 12/03/2014] [Indexed: 12/26/2022] Open
Abstract
The brain's impotence to utilize long-chain fatty acids as fuel, one of the dogmas in neuroscience, is surprising, since the nervous system is the tissue most energy consuming and most vulnerable to a lack of energy. Challenging this view, we here show in vivo that loss of the Drosophila carnitine palmitoyltransferase 2 (CPT2), an enzyme required for mitochondrial β-oxidation of long-chain fatty acids as substrates for energy production, results in the accumulation of triacylglyceride-filled lipid droplets in adult Drosophila brain but not in obesity. CPT2 rescue in glial cells alone is sufficient to restore triacylglyceride homeostasis, and we suggest that this is mediated by the release of ketone bodies from the rescued glial cells. These results demonstrate that the adult brain is able to catabolize fatty acids for cellular energy production.
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Affiliation(s)
- Joachim G Schulz
- VIB Center for the Biology of Disease, Leuven and Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Antonio Laranjeira
- VIB Center for the Biology of Disease, Leuven and Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Leen Van Huffel
- VIB Center for the Biology of Disease, Leuven and Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Annette Gärtner
- VIB Center for the Biology of Disease, Leuven and Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Sven Vilain
- VIB Center for the Biology of Disease, Leuven and Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Jarl Bastianen
- VIB Center for the Biology of Disease, Leuven and Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Carlos G Dotti
- 1] VIB Center for the Biology of Disease, Leuven and Center for Human Genetics, KU Leuven, Leuven, Belgium [2] Centro Biología Molecular "Severo Ochoa" CSIC-UAM, Madrid, Spain
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43
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Ihlefeld K, Vienken H, Claas RF, Blankenbach K, Rudowski A, ter Braak M, Koch A, Van Veldhoven PP, Pfeilschifter J, Meyer zu Heringdorf D. Upregulation of ABC transporters contributes to chemoresistance of sphingosine 1-phosphate lyase-deficient fibroblasts. J Lipid Res 2014; 56:60-9. [PMID: 25385827 DOI: 10.1194/jlr.m052761] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Sphingosine 1-phosphate (S1P) is an extra- and intracellular mediator that regulates cell growth, survival, migration, and adhesion in many cell types. S1P lyase is the enzyme that irreversibly cleaves S1P and thereby constitutes the ultimate step in sphingolipid catabolism. It has been reported previously that embryonic fibroblasts from S1P lyase-deficient mice (Sgpl1(-/-)-MEFs) are resistant to chemotherapy-induced apoptosis through upregulation of B cell lymphoma 2 (Bcl-2) and Bcl-2-like 1 (Bcl-xL). Here, we demonstrate that the transporter proteins Abcc1/MRP1, Abcb1/MDR1, Abca1, and spinster-2 are upregulated in Sgpl1(-/-)-MEFs. Furthermore, the cells efficiently sequestered the substrates of Abcc1 and Abcb1, fluo-4 and doxorubicin, in subcellular compartments. In line with this, Abcb1 was localized mainly at intracellular vesicular structures. After 16 h of incubation, wild-type MEFs had small apoptotic nuclei containing doxorubicin, whereas the nuclei of Sgpl1(-/-)-MEFs appeared unchanged and free of doxorubicin. A combined treatment with the inhibitors of Abcb1 and Abcc1, zosuquidar and MK571, respectively, reversed the compartmentalization of doxorubicin and rendered the cells sensitive to doxorubicin-induced apoptosis. It is concluded that upregulation of multidrug resistance transporters contributes to the chemoresistance of S1P lyase-deficient MEFs.
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Affiliation(s)
- Katja Ihlefeld
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
| | - Hans Vienken
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
| | - Ralf Frederik Claas
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
| | - Kira Blankenbach
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
| | - Agnes Rudowski
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
| | - Michael ter Braak
- Institut für Pharmakologie, Universitätsklinikum Essen, Essen, Germany
| | - Alexander Koch
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
| | - Paul P Van Veldhoven
- Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Josef Pfeilschifter
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
| | - Dagmar Meyer zu Heringdorf
- Institut für Allgemeine Pharmakologie und Toxikologie, Klinikum der Goethe-Universität, Frankfurt am Main, Germany
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Gao M, Zhao D, Schouteden S, Sorci-Thomas MG, Van Veldhoven PP, Eggermont K, Liu G, Verfaillie CM, Feng Y. Regulation of high-density lipoprotein on hematopoietic stem/progenitor cells in atherosclerosis requires scavenger receptor type BI expression. Arterioscler Thromb Vasc Biol 2014; 34:1900-9. [PMID: 24969774 DOI: 10.1161/atvbaha.114.304006] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
OBJECTIVE Recently, we demonstrated that scavenger receptor type BI (SR-BI), a high-density lipoprotein (HDL) receptor, was expressed on murine hematopoietic stem/progenitor cells (HSPC) and infusion of reconstituted HDL and purified human apolipoprotein A-I (apoA-I) suppressed HSPC proliferation. We hypothesized that SR-B1 expression is required for the observed antiproliferative effects of HDL on HSPC. APPROACH AND RESULTS SR-BI-deficient (SR-BI(-/-)) mice and wild-type controls were fed on chow or high-fat diet (HFD) for 8 to 10 weeks. Under chow diet, a significant increase in Lin(-) Sca1(+) cKit(+) cells (LSK cells, so-called HSPC) was found in the bone marrow of SR-BI(-/-) mice when compared with wild-type mice. HFD induced a further expansion of CD150(+)CD48(-) LSK cells (HSC), HSPC, and granulocyte monocyte progenitors in SR-BI(-/-) mice. Injection of reactive oxygen species inhibitor N-acetylcysteine attenuated HFD-induced HSPC expansion, leukocytosis, and atherosclerosis in SR-BI(-/-) mice. ApoA-I infusion inhibited HSPC cell proliferation, Akt phosphorylation and reactive oxygen species production in HSPC and plaque progression in low-density lipoprotein receptor knockout (LDLr(-/-)) apoA-I(-/-) mice on HFD but had no effect on SR-BI(-/-) mice on HFD. Transplantation of SR-BI(-/-) bone marrow cells into irradiated LDLr(-/-) recipients resulted in enhanced white blood cells reconstitution, inflammatory cell production, and plaque development. In patients with coronary heart disease, HDL levels were negatively correlated with white blood cells count and HSPC frequency in the peripheral blood. By flow cytometry, SR-BI expression was detected on human HSPC. CONCLUSIONS SR-BI plays a critical role in the HDL-mediated regulation HSPC proliferation and differentiation, which is associated with atherosclerosis progression.
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Affiliation(s)
- Mingming Gao
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - Dong Zhao
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - Sarah Schouteden
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - Mary G Sorci-Thomas
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - Paul P Van Veldhoven
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - Kristel Eggermont
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - George Liu
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - Catherine M Verfaillie
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.)
| | - Yingmei Feng
- From the Institute of Cardiovascular Sciences and Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Peking University, Beijing, China (M.G., G.L.); Beijing Key Laboratory of Diabetes Research and Care, LuHe Hospital, Capital University, Peking, China (D.Z.); Interdepartmental Stem Cell Institute (S.S., K.E., C.M.V., Y.F.) and Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine (P.P.V.V.), Katholieke Universiteit Leuven, Leuven, Belgium; and Section on Molecular Medicine, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC (M.G.S.-T.).
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Verheijden S, Beckers L, De Munter S, Van Veldhoven PP, Baes M. Central nervous system pathology in MFP2 deficiency: Insights from general and conditional knockout mouse models. Biochimie 2014; 98:119-26. [DOI: 10.1016/j.biochi.2013.08.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Accepted: 08/03/2013] [Indexed: 12/22/2022]
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46
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Arroyo AI, Camoletto PG, Morando L, Sassoe-Pognetto M, Giustetto M, Van Veldhoven PP, Schuchman EH, Ledesma MD. Pharmacological reversion of sphingomyelin-induced dendritic spine anomalies in a Niemann Pick disease type A mouse model. EMBO Mol Med 2014; 6:398-413. [PMID: 24448491 PMCID: PMC3958313 DOI: 10.1002/emmm.201302649] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Understanding the role of lipids in synapses and the aberrant molecular mechanisms causing the cognitive deficits that characterize most lipidosis is necessary to develop therapies for these diseases. Here we describe sphingomyelin (SM) as a key modulator of the dendritic spine actin cytoskeleton. We show that increased SM levels in neurons of acid sphingomyelinase knock out mice (ASMko), which mimic Niemann Pick disease type A (NPA), result in reduced spine number and size and low levels of filamentous actin. Mechanistically, SM accumulation decreases the levels of metabotropic glutamate receptors type I (mGluR1/5) at the synaptic membrane impairing membrane attachment and activity of RhoA and its effectors ROCK and ProfilinIIa. Pharmacological enhancement of the neutral sphingomyelinase rescues the aberrant molecular and morphological phenotypes in vitro and in vivo and improves motor and memory deficits in ASMko mice. Altogether, these data demonstrate the influence of SM and its catabolic enzymes in dendritic spine physiology and contribute to our understanding of the cognitive deficits of NPA patients, opening new perspectives for therapeutic interventions. Subject Categories Genetics, Gene Therapy & Genetic Disease; Neuroscience
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Affiliation(s)
- Ana I Arroyo
- Department of Neurobiology, Centro Biologia Molecular Severo Ochoa CSIC-UAM, Madrid, Spain
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47
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Mezzar S, de Schryver E, Van Veldhoven PP. RP-HPLC-fluorescence analysis of aliphatic aldehydes: application to aldehyde-generating enzymes HACL1 and SGPL1. J Lipid Res 2013; 55:573-82. [PMID: 24323699 DOI: 10.1194/jlr.d044230] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Long-chain aldehydes are commonly produced in various processes, such as peroxisomal α-oxidation of long-chain 3-methyl-branched and 2-hydroxy fatty acids and microsomal breakdown of phosphorylated sphingoid bases. The enzymes involved in the aldehyde-generating steps of these processes are 2-hydroxyacyl-CoA lyase (HACL1) and sphingosine-1-phosphate lyase (SGPL1), respectively. In the present work, nonradioactive assays for these enzymes were developed employing the Hantzsch reaction. Tridecanal (C13-al) and heptadecanal (C17-al) were selected as model compounds and cyclohexane-1,3-dione as 1,3-diketone, and the fluorescent derivatives were analyzed by reversed phase (RP)-HPLC. Assay mixture composition, as well as pH and heating, were optimized for C13-al and C17-al. Under optimized conditions, these aldehydes could be quantified in picomolar range and different long-chain aldehyde derivatives were well resolved with a linear gradient elution by RP-HPLC. Aldehydes generated by recombinant enzymes could easily be detected via this method. Moreover, the assay allowed to document activity or deficiency in tissue homogenates and fibroblast lysates without an extraction step. In conclusion, a simple, quick, and cheap assay for the study of HACL1 and SGPL1 activities was developed, without relying on expensive mass spectrometric detectors or radioactive substrates.
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Affiliation(s)
- Serena Mezzar
- Department Cellular and Molecular Medicine, Katholieke Universiteit Leuven, Leuven, Belgium
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48
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Wang B, Van Veldhoven PP, Brees C, Rubio N, Nordgren M, Apanasets O, Kunze M, Baes M, Agostinis P, Fransen M. Mitochondria are targets for peroxisome-derived oxidative stress in cultured mammalian cells. Free Radic Biol Med 2013; 65:882-894. [PMID: 23988789 DOI: 10.1016/j.freeradbiomed.2013.08.173] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 08/13/2013] [Accepted: 08/19/2013] [Indexed: 12/16/2022]
Abstract
Many cellular processes are driven by spatially and temporally regulated redox-dependent signaling events. Although mounting evidence indicates that organelles such as the endoplasmic reticulum and mitochondria can function as signaling platforms for oxidative stress-regulated pathways, little is known about the role of peroxisomes in these processes. In this study, we employ targeted variants of the genetically encoded photosensitizer KillerRed to gain a better insight into the interplay between peroxisomes and cellular oxidative stress. We show that the phototoxic effects of peroxisomal KillerRed induce mitochondria-mediated cell death and that this process can be counteracted by targeted overexpression of a select set of antioxidant enzymes, including peroxisomal glutathione S-transferase kappa 1, superoxide dismutase 1, and mitochondrial catalase. We also present evidence that peroxisomal disease cell lines deficient in plasmalogen biosynthesis or peroxisome assembly are more sensitive to KillerRed-induced oxidative stress than control cells. Collectively, these findings confirm and extend previous observations suggesting that disturbances in peroxisomal redox control and metabolism can sensitize cells to oxidative stress. In addition, they lend strong support to the ideas that peroxisomes and mitochondria share a redox-sensitive relationship and that the redox communication between these organelles is not only mediated by diffusion of reactive oxygen species from one compartment to the other. Finally, these findings indicate that mitochondria may act as dynamic receivers, integrators, and transmitters of peroxisome-derived mediators of oxidative stress, and this may have profound implications for our views on cellular aging and age-related diseases.
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Affiliation(s)
- Bo Wang
- Laboratory of Lipid Biochemistry and Protein Interactions, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Paul P Van Veldhoven
- Laboratory of Lipid Biochemistry and Protein Interactions, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Chantal Brees
- Laboratory of Lipid Biochemistry and Protein Interactions, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Noemí Rubio
- Laboratory of Cell Death Research and Therapy, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Marcus Nordgren
- Laboratory of Lipid Biochemistry and Protein Interactions, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Oksana Apanasets
- Laboratory of Lipid Biochemistry and Protein Interactions, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Markus Kunze
- Center for Brain Research, Medical University of Vienna, 1090 Vienna, Austria
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Patrizia Agostinis
- Laboratory of Cell Death Research and Therapy, Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, 3000 Leuven, Belgium
| | - Marc Fransen
- Laboratory of Lipid Biochemistry and Protein Interactions, Katholieke Universiteit Leuven, 3000 Leuven, Belgium.
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Abstract
Although peroxisomes are ubiquitous organelles in all animal species, their importance for the functioning of tissues and organs remains largely unresolved. Because peroxins are essential for the biogenesis of peroxisomes, an obvious approach to investigate their physiological role is to inactivate a Pex gene or to suppress its translation. This has been performed in mice but also in more primitive organisms including D. melanogaster, C. elegans, and D. rerio, and the major findings and abnormalities in these models will be highlighted. Although peroxisomes are generally not essential for embryonic development and organogenesis, a generalized inactivity of peroxisomes affects lifespan and posthatching/postnatal growth, proving that peroxisomal metabolism is necessary for the normal maturation of these organisms. Strikingly, despite the wide variety of model organisms, corresponding tissues are affected including the central nervous system and the testis. By inactivating peroxisomes in a cell type selective way in the brain of mice, it was also demonstrated that peroxisomes are necessary to prevent neurodegeneration. As these peroxisome deficient model organisms recapitulate pathologies of patients affected with peroxisomal diseases, their further analysis will contribute to the elucidation of still elusive pathogenic mechanisms.
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Affiliation(s)
| | - Myriam Baes
- Laboratory of Cellular Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU LeuvenLeuven, Belgium
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50
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Apanasets O, Grou CP, Van Veldhoven PP, Brees C, Wang B, Nordgren M, Dodt G, Azevedo JE, Fransen M. PEX5, the shuttling import receptor for peroxisomal matrix proteins, is a redox-sensitive protein. Traffic 2013; 15:94-103. [PMID: 24118911 DOI: 10.1111/tra.12129] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 10/03/2013] [Accepted: 10/07/2013] [Indexed: 01/11/2023]
Abstract
Peroxisome maintenance depends on the import of nuclear-encoded proteins from the cytosol. The vast majority of these proteins is destined for the peroxisomal lumen and contains a C-terminal peroxisomal targeting signal, called PTS1. This targeting signal is recognized in the cytosol by the receptor PEX5. After docking at the peroxisomal membrane and release of the cargo into the organelle matrix, PEX5 is recycled to the cytosol through a process requiring monoubiquitination of an N-terminal, cytosolically exposed cysteine residue (Cys11 in the human protein). At present, the reason why a cysteine, and not a lysine residue, is the target of ubiquitination remains unclear. Here, we provide evidence that PTS1 protein import into human fibroblasts is a redox-sensitive process. We also demonstrate that Cys11 in human PEX5 functions as a redox switch that regulates PEX5 activity in response to intracellular oxidative stress. Finally, we show that exposure of human PEX5 to oxidized glutathione results in a ubiquitination-deficient PEX5 molecule, and that substitution of Cys11 by a lysine can counteract this effect. In summary, these findings reveal that the activity of PEX5, and hence PTS1 import, is controlled by the redox state of the cytosol. The potential physiological implications of these findings are discussed.
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Affiliation(s)
- Oksana Apanasets
- Laboratory of Lipid Biochemistry and Protein Interactions, Department of Cellular and Molecular Medicine, KU, Leuven, Belgium
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