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Liu Y, Dai H, Bamu A, Lin X. Peroxisome biogenesis factor PEX14 is crucial for survival and fecundity of female brown planthopper, Nilaparvata lugens (Stål). INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2024; 170:104139. [PMID: 38815735 DOI: 10.1016/j.ibmb.2024.104139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 04/29/2024] [Accepted: 05/27/2024] [Indexed: 06/01/2024]
Abstract
Peroxisomes are ubiquitous cellular organelles participating in a variety of critical metabolic reactions. PEX14 is an essential peroxin responsible for peroxisome biogenesis. In this study, we identified the human PEX14 homolog in the brown planthopper, Nilaparvata lugens (Hemiptera: Delphacidae). N. lugens PEX14 (NlPEX14) showed significant topological similarity to its human counterpart. It is expressed throughout all developmental stages, with the highest expression observed in adult insects. Down-regulation of NlPEX14 through injection of NlPEX14-specific double-strand RNA impaired nymphal development. Moreover, females subjected to dsNlPEX14 treatment exhibited a significantly reduced lifespan. Additionally, we found abnormal ovarian development and a significant decrease in the number of eggs laid in NlPEX14-downregulated females. Further experiments support that the shortening of lifespan and the decrease in female fecundity can be attributed, at least partially, to the accumulation of fatty acids and reduced expression of vitellogenin. Together, our study reveals an indispensable function of NlPEX14 for insect reproduction and establishes a causal connection between the phenotypes and peroxisome biogenesis, shedding light on the importance of peroxisomes in female fecundity.
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Affiliation(s)
- Yuqiong Liu
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Huan Dai
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Anfu Bamu
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Xinda Lin
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, China.
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2
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Bajdzienko J, Bremm A. Mammalian pexophagy at a glance. J Cell Sci 2024; 137:jcs259775. [PMID: 38752931 PMCID: PMC11166455 DOI: 10.1242/jcs.259775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2024] Open
Abstract
Peroxisomes are highly plastic organelles that are involved in several metabolic processes, including fatty acid oxidation, ether lipid synthesis and redox homeostasis. Their abundance and activity are dynamically regulated in response to nutrient availability and cellular stress. Damaged or superfluous peroxisomes are removed mainly by pexophagy, the selective autophagy of peroxisomes induced by ubiquitylation of peroxisomal membrane proteins or ubiquitin-independent processes. Dysregulated pexophagy impairs peroxisome homeostasis and has been linked to the development of various human diseases. Despite many recent insights into mammalian pexophagy, our understanding of this process is still limited compared to our understanding of pexophagy in yeast. In this Cell Science at a Glance article and the accompanying poster, we summarize current knowledge on the control of mammalian pexophagy and highlight which aspects require further attention. We also discuss the role of ubiquitylation in pexophagy and describe the ubiquitin machinery involved in regulating signals for the recruitment of phagophores to peroxisomes.
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Affiliation(s)
- Justyna Bajdzienko
- Goethe University Frankfurt,Medical Faculty,Institute of Biochemistry II, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Anja Bremm
- Goethe University Frankfurt,Medical Faculty,Institute of Biochemistry II, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
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3
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Gaussmann S, Peschel R, Ott J, Zak KM, Sastre J, Delhommel F, Popowicz GM, Boekhoven J, Schliebs W, Erdmann R, Sattler M. Modulation of peroxisomal import by the PEX13 SH3 domain and a proximal FxxxF binding motif. Nat Commun 2024; 15:3317. [PMID: 38632234 PMCID: PMC11024197 DOI: 10.1038/s41467-024-47605-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 04/08/2024] [Indexed: 04/19/2024] Open
Abstract
Import of proteins into peroxisomes depends on PEX5, PEX13 and PEX14. By combining biochemical methods and structural biology, we show that the C-terminal SH3 domain of PEX13 mediates intramolecular interactions with a proximal FxxxF motif. The SH3 domain also binds WxxxF peptide motifs in the import receptor PEX5, demonstrating evolutionary conservation of such interactions from yeast to human. Strikingly, intramolecular interaction of the PEX13 FxxxF motif regulates binding of PEX5 WxxxF/Y motifs to the PEX13 SH3 domain. Crystal structures reveal how FxxxF and WxxxF/Y motifs are recognized by a non-canonical surface on the SH3 domain. The PEX13 FxxxF motif also mediates binding to PEX14. Surprisingly, the potential PxxP binding surface of the SH3 domain does not recognize PEX14 PxxP motifs, distinct from its yeast ortholog. Our data show that the dynamic network of PEX13 interactions with PEX5 and PEX14, mediated by diaromatic peptide motifs, modulates peroxisomal matrix import.
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Affiliation(s)
- Stefan Gaussmann
- Technical University of Munich, TUM School of Natural Sciences, Bavarian NMR Center and Department of Bioscience, Lichtenbergstr. 4, 85747, Garching, Germany
- Helmholtz Munich, Molecular Targets and Therapeutics Center, Institute of Structural Biology, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Rebecca Peschel
- Institute of Biochemistry and Pathobiochemistry, Department of Systems Biology, Faculty of Medicine, Ruhr University Bochum, 44780, Bochum, Germany
| | - Julia Ott
- Institute of Biochemistry and Pathobiochemistry, Department of Systems Biology, Faculty of Medicine, Ruhr University Bochum, 44780, Bochum, Germany
| | - Krzysztof M Zak
- Helmholtz Munich, Molecular Targets and Therapeutics Center, Institute of Structural Biology, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Judit Sastre
- Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstr. 4, 85747, Garching, Germany
| | - Florent Delhommel
- Technical University of Munich, TUM School of Natural Sciences, Bavarian NMR Center and Department of Bioscience, Lichtenbergstr. 4, 85747, Garching, Germany
- Helmholtz Munich, Molecular Targets and Therapeutics Center, Institute of Structural Biology, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Grzegorz M Popowicz
- Technical University of Munich, TUM School of Natural Sciences, Bavarian NMR Center and Department of Bioscience, Lichtenbergstr. 4, 85747, Garching, Germany
- Helmholtz Munich, Molecular Targets and Therapeutics Center, Institute of Structural Biology, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Job Boekhoven
- Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstr. 4, 85747, Garching, Germany
| | - Wolfgang Schliebs
- Institute of Biochemistry and Pathobiochemistry, Department of Systems Biology, Faculty of Medicine, Ruhr University Bochum, 44780, Bochum, Germany
| | - Ralf Erdmann
- Institute of Biochemistry and Pathobiochemistry, Department of Systems Biology, Faculty of Medicine, Ruhr University Bochum, 44780, Bochum, Germany.
| | - Michael Sattler
- Technical University of Munich, TUM School of Natural Sciences, Bavarian NMR Center and Department of Bioscience, Lichtenbergstr. 4, 85747, Garching, Germany.
- Helmholtz Munich, Molecular Targets and Therapeutics Center, Institute of Structural Biology, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany.
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4
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Wang X, Zhang Z, Zuo W, Wang D, Yang F, Liu Q, Xiao Y. Case Report: Identification of microduplication in the chromosomal 2p16.1p15 region in an infant suffering from pulmonary arterial hypertension. Front Cardiovasc Med 2023; 10:1219480. [PMID: 37937284 PMCID: PMC10626460 DOI: 10.3389/fcvm.2023.1219480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 10/03/2023] [Indexed: 11/09/2023] Open
Abstract
This study reports the first case of a patient with chromosomal 2p16.1p15 microduplication syndrome complicated by pulmonary arterial hypertension (PAH). A female infant was admitted to the hospital suffering from dyskinesia and developmental delay, and conventional echocardiography revealed an atrial septal defect (ASD), which was not taken seriously or treated at that time. Two years later, preoperative right heart catheterization for ASD closure revealed a mean pulmonary artery pressure (mPAP) of 45 mmHg. The mPAP was reduced, and the condition was stabilized after drug therapy. A genomic copy number duplication (3×) of at least 2.58 Mb in the 2p16.1p15 region on the paternal chromosome was revealed. Multiple Online Mendelian Inheritance in Man (OMIM) genes are involved in this genomic region, such as BCL11A, EHBP1, FAM161A, PEX13, and REL. EHBP1 promotes a molecular phenotypic transformation of pulmonary vascular endothelial cells and is thought to be involved in the rapidly developing PAH of this infant. Collectively, our findings contribute to the knowledge of the genes involved and the clinical manifestations of the 2p16.1p15 microduplication syndrome. Moreover, clinicians should be alert to the possibility of PAH and take early drug intervention when facing patients with 2p16.1p15 microduplications.
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Affiliation(s)
- Xun Wang
- Department of Cardiology, Hunan Children’s Hospital, Changsha, China
| | - Zeying Zhang
- Department of Cardiovascular Medicine, The Second Xiangya Hospital of Central South University, Changsha, China
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Wanyun Zuo
- Department of Cardiovascular Medicine, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Dan Wang
- Department of Cardiology, Hunan Children’s Hospital, Changsha, China
| | - Fan Yang
- Department of Cardiovascular Medicine, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Qiming Liu
- Department of Cardiovascular Medicine, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Yunbin Xiao
- Department of Cardiology, Hunan Children’s Hospital, Changsha, China
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Chi L, Lee D, Leung S, Hu G, Wen B, Delgado-Olguin P, Vissa M, Li R, Brumell JH, Kim PK, Bandsma RHJ. Loss of functional peroxisomes leads to increased mitochondrial biogenesis and reduced autophagy that preserve mitochondrial function. Cell Mol Life Sci 2023; 80:183. [PMID: 37338571 DOI: 10.1007/s00018-023-04827-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 05/28/2023] [Accepted: 05/29/2023] [Indexed: 06/21/2023]
Abstract
Peroxisomes are essential for mitochondrial health, as the absence of peroxisomes leads to altered mitochondria. However, it is unclear whether the changes in mitochondria are a function of preserving cellular function or a response to cellular damage caused by the absence of peroxisomes. To address this, we developed conditional hepatocyte-specific Pex16 deficient (Pex16 KO) mice that develop peroxisome loss and subjected them to a low-protein diet to induce metabolic stress. Loss of PEX16 in hepatocytes led to increased biogenesis of small mitochondria and reduced autophagy flux but with preserved capacity for respiration and ATP capacity. Metabolic stress induced by low protein feeding led to mitochondrial dysfunction in Pex16 KO mice and impaired biogenesis. Activation of PPARα partially corrected these mitochondrial disturbances, despite the absence of peroxisomes. The findings of this study demonstrate that the absence of peroxisomes in hepatocytes results in a concerted effort to preserve mitochondrial function, including increased mitochondrial biogenesis, altered morphology, and modified autophagy activity. Our study underscores the relationship between peroxisomes and mitochondria in regulating the hepatic metabolic responses to nutritional stressors.
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Affiliation(s)
- Lijun Chi
- Translational Medicine Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
| | - Dorothy Lee
- Translational Medicine Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
- Department of Physiology, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Sharon Leung
- Cell Biology Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
| | - Guanlan Hu
- Translational Medicine Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
- Department of Nutritional Sciences, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Bijun Wen
- Translational Medicine Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
- Department of Nutritional Sciences, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Paul Delgado-Olguin
- Translational Medicine Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A1, Canada
- Heart and Stroke Richard Lewar Centre of Excellence, Toronto, ON, M5S 3H2, Canada
| | - Miluska Vissa
- Cell Biology Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
| | - Ren Li
- Cell Biology Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
| | - John H Brumell
- Cell Biology Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - Peter K Kim
- Cell Biology Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada.
- Department of Biochemistry, University of Toronto, Toronto, ON, M5S 1A1, Canada.
| | - Robert H J Bandsma
- Translational Medicine Program, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada.
- Department of Nutritional Sciences, University of Toronto, Toronto, ON, M5S 1A1, Canada.
- Centre for Global Child Health, The Hospital of Sick Children, Toronto, ON, M5G 0A4, Canada.
- Division of Gastroenterology, Hepatology and Nutrition, The Hospital for Sick Children, Toronto, ON, M5G 0A4, Canada.
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6
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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] [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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Demers ND, Riccio V, Jo DS, Bhandari S, Law KB, Liao W, Kim C, McQuibban GA, Choe SK, Cho DH, Kim PK. PEX13 prevents pexophagy by regulating ubiquitinated PEX5 and peroxisomal ROS. Autophagy 2023:1-22. [PMID: 36541703 DOI: 10.1080/15548627.2022.2160566] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Peroxisomes are rapidly degraded during amino acid and oxygen deprivation by a type of selective autophagy called pexophagy. However, how damaged peroxisomes are detected and removed from the cell is poorly understood. Recent studies suggest that the peroxisomal matrix protein import machinery may serve double duty as a quality control machinery, where they are directly involved in activating pexophagy. Here, we explored whether any matrix import factors are required to prevent pexophagy, such that their loss designates peroxisomes for degradation. Using gene editing and quantitative fluorescence microscopy on culture cells and a zebrafish model system, we found that PEX13, a component of the peroxisomal matrix import system, is required to prevent the degradation of otherwise healthy peroxisomes. The loss of PEX13 caused an accumulation of ubiquitinated PEX5 on peroxisomes and an increase in peroxisome-dependent reactive oxygen species that coalesce to induce pexophagy. We also found that PEX13 protein level is downregulated to aid in the induction of pexophagy during amino acid starvation. Together, our study points to PEX13 as a novel pexophagy regulator that is modulated to maintain peroxisome homeostasis.Abbreviations: AAA ATPases: ATPases associated with diverse cellular activities; ABCD3: ATP binding cassette subfamily D member; 3ACOX1: acyl-CoA oxidase; 1ACTA1: actin alpha 1, skeletal muscle; ACTB: actin beta; ATG5: autophagy related 5; ATG7: autophagy related 7; ATG12: autophagy related 12; ATG16L1: autophagy related 16 like 1; CAT: catalase; CQ: chloroquine; Dpf: days post fertilization: FBS: fetal bovine serum; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; GFP: green fluorescent protein; H2O2: hydrogen peroxide; HA - human influenza hemagglutinin; HBSS: Hanks' Balanced Salt Solution; HCQ; hydroxychloroquine; KANL: lysine alanine asparagine leucine; KO: knockout; MAP1LC3B: microtubule associated protein 1 light chain 3 beta; MEF: mouse embryonic fibroblast; MTOR: mechanistic target of rapamycin kinase; MTORC1: mechanistic target of rapamycin kinase complex 1; MTORC2: mechanistic target of rapamycin kinase complex 2; MYC: MYC proto-oncogene, bHLH transcription factor; MZ: maternal and zygotic; NAC: N-acetyl cysteine; NBR1 - NBR1 autophagy cargo receptor; PBD: peroxisome biogenesis disorder; PBS: phosphate-buffered saline; PEX: peroxisomal biogenesis factor; PTS1: peroxisome targeting sequence 1; RFP: red fluorescent protein; ROS: reactive oxygen speciess; iRNA: short interfering RNA; SKL: serine lysine leucine; SLC25A17/PMP34: solute carrier family 25 member 17; Ub: ubiquitin; USP30: ubiquitin specific peptidase 30.
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Affiliation(s)
- Nicholas D Demers
- Cell Biology Program, Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Victoria Riccio
- Cell Biology Program, Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Doo Sin Jo
- School of Life Sciences, BK21 Four Knu Creative BioResearch Group Kyungpook National University, Republic of Korea
| | - Sushil Bhandari
- Department of Microbiology, Wonkwang University School of Medicine, Iksan, Republic of Korea
| | - Kelsey B Law
- Cell Biology Program, Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Weifang Liao
- Department of Microbiology, Wonkwang University School of Medicine, Iksan, Republic of Korea
| | - Choy Kim
- Department of Microbiology, Wonkwang University School of Medicine, Iksan, Republic of Korea
| | - G Angus McQuibban
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Seong-Kyu Choe
- Department of Microbiology, Wonkwang University School of Medicine, Iksan, Republic of Korea
| | - Dong-Hyung Cho
- School of Life Sciences, BK21 Four Knu Creative BioResearch Group Kyungpook National University, Republic of Korea
| | - Peter K Kim
- Cell Biology Program, Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada.,Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, South Korea
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8
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Fujiki Y, Okumoto K, Honsho M, Abe Y. Molecular insights into peroxisome homeostasis and peroxisome biogenesis disorders. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2022; 1869:119330. [PMID: 35917894 DOI: 10.1016/j.bbamcr.2022.119330] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 07/25/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
Peroxisomes are single-membrane organelles essential for cell metabolism including the β-oxidation of fatty acids, synthesis of etherlipid plasmalogens, and redox homeostasis. Investigations into peroxisome biogenesis and the human peroxisome biogenesis disorders (PBDs) have identified 14 PEX genes encoding peroxins involved in peroxisome biogenesis and the mutation of PEX genes is responsible for the PBDs. Many recent findings have further advanced our understanding of the biology, physiology, and consequences of a functional deficit of peroxisomes. In this Review, we discuss cell defense mechanisms that counteract oxidative stress by 1) a proapoptotic Bcl-2 factor BAK-mediated release to the cytosol of H2O2-degrading catalase from peroxisomes and 2) peroxisomal import suppression of catalase by Ser232-phosphorylation of Pex14, a docking protein for the Pex5-PTS1 complex. With respect to peroxisome division, the important issue of how the energy-rich GTP is produced and supplied for the division process was recently addressed by the discovery of a nucleoside diphosphate kinase-like protein, termed DYNAMO1 in a lower eukaryote, which has a mammalian homologue NME3. In regard to the mechanisms underlying the pathogenesis of PBDs, a new PBD model mouse defective in Pex14 manifests a dysregulated brain-derived neurotrophic factor (BDNF)-TrkB pathway, an important signaling pathway for cerebellar morphogenesis. Communications between peroxisomes and other organelles are also addressed.
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Affiliation(s)
- Yukio Fujiki
- Medical Institute of Bioregulation, Institute of Rheological Functions of Food, Collaboration Program, Kyushu University, 3-1-1 Maidashi, Fukuoka 812-8582, Japan.
| | - Kanji Okumoto
- Department of Biology and Graduate School of Systems Life Sciences, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
| | - Masanori Honsho
- Medical Institute of Bioregulation, Institute of Rheological Functions of Food, Collaboration Program, Kyushu University, 3-1-1 Maidashi, Fukuoka 812-8582, Japan
| | - Yuichi Abe
- Faculty of Arts and Science, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
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9
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Kim J, Bai H. Peroxisomal Stress Response and Inter-Organelle Communication in Cellular Homeostasis and Aging. Antioxidants (Basel) 2022; 11:192. [PMID: 35204075 PMCID: PMC8868334 DOI: 10.3390/antiox11020192] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 01/15/2022] [Accepted: 01/16/2022] [Indexed: 12/20/2022] Open
Abstract
Peroxisomes are key regulators of cellular and metabolic homeostasis. These organelles play important roles in redox metabolism, the oxidation of very-long-chain fatty acids (VLCFAs), and the biosynthesis of ether phospholipids. Given the essential role of peroxisomes in cellular homeostasis, peroxisomal dysfunction has been linked to various pathological conditions, tissue functional decline, and aging. In the past few decades, a variety of cellular signaling and metabolic changes have been reported to be associated with defective peroxisomes, suggesting that many cellular processes and functions depend on peroxisomes. Peroxisomes communicate with other subcellular organelles, such as the nucleus, mitochondria, endoplasmic reticulum (ER), and lysosomes. These inter-organelle communications are highly linked to the key mechanisms by which cells surveil defective peroxisomes and mount adaptive responses to protect them from damages. In this review, we highlight the major cellular changes that accompany peroxisomal dysfunction and peroxisomal inter-organelle communication through membrane contact sites, metabolic signaling, and retrograde signaling. We also discuss the age-related decline of peroxisomal protein import and its role in animal aging and age-related diseases. Unlike other organelle stress response pathways, such as the unfolded protein response (UPR) in the ER and mitochondria, the cellular signaling pathways that mediate stress responses to malfunctioning peroxisomes have not been systematically studied and investigated. Here, we coin these signaling pathways as "peroxisomal stress response pathways". Understanding peroxisomal stress response pathways and how peroxisomes communicate with other organelles are important and emerging areas of peroxisome research.
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Affiliation(s)
- Jinoh Kim
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA 50011, USA
| | - Hua Bai
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA 50011, USA
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10
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Park WY, Park J, Lee S, Song G, Nam IK, Ahn KS, Choe SK, Um JY. PEX13 is required for thermogenesis of white adipose tissue in cold-exposed mice. Biochim Biophys Acta Mol Cell Biol Lipids 2021; 1867:159046. [PMID: 34517131 DOI: 10.1016/j.bbalip.2021.159046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 08/19/2021] [Accepted: 08/19/2021] [Indexed: 11/28/2022]
Abstract
Non-shivering thermogenesis (NST) is a heat generating process controlled by the mitochondria of brown adipose tissue (BAT). In the recent decade, 'functionally' acting brown adipocytes in white adipose tissue (WAT) has been identified as well: the so-called process of the 'browning' of WAT. While the importance of uncoupling protein 1 (UCP1)-oriented mitochondrial activation has been intensely studied, the role of peroxisomes during the browning of white adipocytes is poorly understood. Here, we assess the change in peroxisomal membrane proteins, or peroxins (PEXs), during cold stimulation and importantly, the role of PEX13 in the cold-induced remodeling of white adipocytes. PEX13, a protein that originally functions as a docking factor and is involved in protein import into peroxisome matrix, was highly increased during cold-induced recruitment of beige adipocytes within the inguinal WAT of C57BL/6 mice. Moreover, beige-induced 3 T3-L1 adipocytes and stromal vascular fraction (SVF) cells by exposure to the peroxisome proliferator-activated receptor gamma (PPARγ) agonist rosiglitazone showed a significant increase in mitochondrial thermogenic factors along with peroxisomal proteins including PEX13, and these were confirmed in SVF cells with the beta 3 adrenergic receptor (β3AR)-selective agonist CL316,243. To verify the relevance of PEX13, we used the RNA silencing method targeting the Pex13 gene and evaluated the subsequent beige development in SVF cells. Interestingly, siPex13 treatment suppressed expression of thermogenic proteins such as UCP1 and PPARγ coactivator 1 alpha (PGC1α). Overall, our data provide evidence supporting the role of peroxisomal proteins, in particular PEX13, during beige remodeling of white adipocytes.
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Affiliation(s)
- Woo Yong Park
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-Gu, Seoul 02447, Republic of Korea
| | - Jinbong Park
- Department of Pharmacology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea; Basic Research Laboratory for Comorbidity Regulation and Department of Comorbodity Research, KyungHee Institute of Convergence Korean Medicine, Kyung Hee University, Seoul 02447, Korea
| | - Sujin Lee
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-Gu, Seoul 02447, Republic of Korea
| | - Gahee Song
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-Gu, Seoul 02447, Republic of Korea
| | - In-Koo Nam
- Department of Microbiology, Wonkwang University School of Medicine, Iksan 54538, Republic of Korea
| | - Kwang Seok Ahn
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-Gu, Seoul 02447, Republic of Korea; Basic Research Laboratory for Comorbidity Regulation and Department of Comorbodity Research, KyungHee Institute of Convergence Korean Medicine, Kyung Hee University, Seoul 02447, Korea
| | - Seong-Kyu Choe
- Department of Microbiology, Wonkwang University School of Medicine, Iksan 54538, Republic of Korea
| | - Jae-Young Um
- Department of Pharmacology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea; Basic Research Laboratory for Comorbidity Regulation and Department of Comorbodity Research, KyungHee Institute of Convergence Korean Medicine, Kyung Hee University, Seoul 02447, Korea..
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11
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Meyer MT, Watermann C, Dreyer T, Wagner S, Wittekindt C, Klussmann JP, Ergün S, Baumgart-Vogt E, Karnati S. Differential Expression of Peroxisomal Proteins in Distinct Types of Parotid Gland Tumors. Int J Mol Sci 2021; 22:7872. [PMID: 34360635 PMCID: PMC8345988 DOI: 10.3390/ijms22157872] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 07/08/2021] [Accepted: 07/19/2021] [Indexed: 11/16/2022] Open
Abstract
Salivary gland cancers are rare but aggressive tumors that have poor prognosis and lack effective cure. Of those, parotid tumors constitute the majority. Functioning as metabolic machinery contributing to cellular redox balance, peroxisomes have emerged as crucial players in tumorigenesis. Studies on murine and human cells have examined the role of peroxisomes in carcinogenesis with conflicting results. These studies either examined the consequences of altered peroxisomal proliferators or compared their expression in healthy and neoplastic tissues. None, however, examined such differences exclusively in human parotid tissue or extended comparison to peroxisomal proteins and their associated gene expressions. Therefore, we examined differences in peroxisomal dynamics in parotid tumors of different morphologies. Using immunofluorescence and quantitative PCR, we compared the expression levels of key peroxisomal enzymes and proliferators in healthy and neoplastic parotid tissue samples. Three parotid tumor subtypes were examined: pleomorphic adenoma, mucoepidermoid carcinoma and acinic cell carcinoma. We observed higher expression of peroxisomal matrix proteins in neoplastic samples with exceptional down regulation of certain enzymes; however, the degree of expression varied between tumor subtypes. Our findings confirm previous experimental results on other organ tissues and suggest peroxisomes as possible therapeutic targets or markers in all or certain subtypes of parotid neoplasms.
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Affiliation(s)
- Malin Tordis Meyer
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Giessen, Klinikstrasse 33, Ebene-1, D-35392 Gießen, Germany; (M.T.M.); (C.W.); (S.W.); (C.W.); (J.P.K.)
| | - Christoph Watermann
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Giessen, Klinikstrasse 33, Ebene-1, D-35392 Gießen, Germany; (M.T.M.); (C.W.); (S.W.); (C.W.); (J.P.K.)
| | - Thomas Dreyer
- Institute of Pathology, Justus Liebig University, Langhansstrasse 10, D-35392 Gießen, Germany;
| | - Steffen Wagner
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Giessen, Klinikstrasse 33, Ebene-1, D-35392 Gießen, Germany; (M.T.M.); (C.W.); (S.W.); (C.W.); (J.P.K.)
| | - Claus Wittekindt
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Giessen, Klinikstrasse 33, Ebene-1, D-35392 Gießen, Germany; (M.T.M.); (C.W.); (S.W.); (C.W.); (J.P.K.)
| | - Jens Peter Klussmann
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Giessen, Klinikstrasse 33, Ebene-1, D-35392 Gießen, Germany; (M.T.M.); (C.W.); (S.W.); (C.W.); (J.P.K.)
- Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Cologne, D-50931 Cologne, Germany
| | - Süleyman Ergün
- Institute for Anatomy and Cell Biology, Julius-Maximilians-University Würzburg, Koellikerstrasse 6, D-97070 Würzburg, Germany;
| | - Eveline Baumgart-Vogt
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University, D-35385 Gießen, Germany;
| | - Srikanth Karnati
- Institute for Anatomy and Cell Biology, Julius-Maximilians-University Würzburg, Koellikerstrasse 6, D-97070 Würzburg, Germany;
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University, D-35385 Gießen, Germany;
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12
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Takashima S, Takemoto S, Toyoshi K, Ohba A, Shimozawa N. Zebrafish model of human Zellweger syndrome reveals organ-specific accumulation of distinct fatty acid species and widespread gene expression changes. Mol Genet Metab 2021; 133:307-323. [PMID: 34016526 DOI: 10.1016/j.ymgme.2021.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 05/04/2021] [Accepted: 05/04/2021] [Indexed: 11/24/2022]
Abstract
In Zellweger syndrome (ZS), lack of peroxisome function causes physiological and developmental abnormalities in many organs such as the brain, liver, muscles, and kidneys, but little is known about the exact pathogenic mechanism. By disrupting the zebrafish pex2 gene, we established a disease model for ZS and found that it exhibits pathological features and metabolic changes similar to those observed in human patients. By comprehensive analysis of the fatty acid profile, we found organ-specific accumulation and reduction of distinct fatty acid species, such as an accumulation of ultra-very-long-chain polyunsaturated fatty acids (ultra-VLC-PUFAs) in the brains of pex2 mutant fish. Transcriptome analysis using microarray also revealed mutant-specific gene expression changes that might lead to the symptoms, including reduction of crystallin, troponin, parvalbumin, and fatty acid metabolic genes. Our data indicated that the loss of peroxisomes results in widespread metabolic and gene expression changes beyond the causative peroxisomal function. These results suggest the genetic and metabolic basis of the pathology of this devastating human disease.
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Affiliation(s)
- Shigeo Takashima
- Division of Genomics Research, Life Science Research Center, Gifu University, Gifu, Japan; Institute for Glyco-core Research (iGCORE), Gifu University, Gifu, Japan; United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan.
| | - Shoko Takemoto
- Division of Genomics Research, Life Science Research Center, Gifu University, Gifu, Japan
| | - Kayoko Toyoshi
- Division of Genomics Research, Life Science Research Center, Gifu University, Gifu, Japan
| | - Akiko Ohba
- Division of Genomics Research, Life Science Research Center, Gifu University, Gifu, Japan
| | - Nobuyuki Shimozawa
- Division of Genomics Research, Life Science Research Center, Gifu University, Gifu, Japan; Institute for Glyco-core Research (iGCORE), Gifu University, Gifu, Japan; United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
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13
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Ranea-Robles P, Portman K, Bender A, Lee K, He JC, Mulholland DJ, Argmann C, Houten SM. Peroxisomal L-bifunctional protein (EHHADH) deficiency causes male-specific kidney hypertrophy and proximal tubular injury in mice. KIDNEY360 2021; 2:1441-1454. [PMID: 34651140 PMCID: PMC8513500 DOI: 10.34067/kid.0003772021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Proximal tubular (PT) cells are enriched in mitochondria and peroxisomes. Whereas mitochondrial fatty acid oxidation (FAO) plays an important role in kidney function by supporting the high-energy requirements of PT cells, the role of peroxisomal metabolism remains largely unknown. EHHADH, also known as L-bifunctional protein, catalyzes the second and third step of peroxisomal FAO. METHODS We studied kidneys of WT and Ehhadh KO mice on a C57BL/6N background using histology, immunohistochemistry, immunofluorescence, immunoblot, RNA-sequencing, and metabolomics. To assess the role of androgens in the kidney phenotype of Ehhadh KO mice, mice underwent orchiectomy. RESULTS We observed male-specific kidney hypertrophy and glomerular filtration rate reduction in adult Ehhadh KO mice. Transcriptome analysis unveiled a gene expression signature similar to PT injury in acute kidney injury mouse models. This was further illustrated by the presence of KIM-1 (kidney injury molecule-1), SOX-9, and Ki67-positive cells in the PT of male Ehhadh KO kidneys. Male Ehhadh KO kidneys had metabolite changes consistent with peroxisomal dysfunction as well as an elevation in glycosphingolipid levels. Orchiectomy of Ehhadh KO mice decreased the number of KIM-1 positive cells to WT levels. We revealed a pronounced sexual dimorphism in the expression of peroxisomal FAO proteins in mouse kidney, underlining a role of androgens in the kidney phenotype of Ehhadh KO mice. CONCLUSIONS Our data highlight the importance of EHHADH and peroxisomal metabolism in male kidney physiology and reveal peroxisomal FAO as a sexual dimorphic metabolic pathway in mouse kidneys.
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Affiliation(s)
- Pablo Ranea-Robles
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Kensey Portman
- Division of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Aaron Bender
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Kyung Lee
- Department of Medicine, Division of Nephrology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - John Cijiang He
- Department of Medicine, Division of Nephrology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - David J. Mulholland
- Division of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Carmen Argmann
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Sander M. Houten
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
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14
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Abe Y, Nishimura Y, Nakamura K, Tamura S, Honsho M, Udo H, Yamashita T, Fujiki Y. Peroxisome Deficiency Impairs BDNF Signaling and Memory. Front Cell Dev Biol 2020; 8:567017. [PMID: 33163488 PMCID: PMC7591468 DOI: 10.3389/fcell.2020.567017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 09/22/2020] [Indexed: 11/20/2022] Open
Abstract
Peroxisome is an intracellular organelle that functions in essential metabolic pathways including β-oxidation of very-long-chain fatty acids and biosynthesis of plasmalogens. Peroxisome biogenesis disorders (PBDs) manifest severe dysfunction in multiple organs including central nervous system (CNS), whilst the pathogenic mechanisms are largely unknown. We recently reported that peroxisome-deficient neural cells secrete an increased level of brain-derived neurotrophic factor (BDNF), resulting in the cerebellar malformation. Peroxisomal functions in adulthood brain have been little investigated. To induce the peroxisome deficiency in adulthood brain, we here established tamoxifen-inducible conditional Pex2-knockout mouse. Peroxisome deficiency in the conditional Pex2-knockout adult mouse brain induces the upregulated expression of BDNF and its inactive receptor TrkB-T1 in hippocampus, which notably results in memory disturbance. Our results suggest that peroxisome deficiency gives rise to the dysfunction of hippocampal circuit via the impaired BDNF signaling.
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Affiliation(s)
- Yuichi Abe
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.,Faculty of Arts and Science, Kyushu University, Fukuoka, Japan
| | - Yoshiki Nishimura
- Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, Japan
| | - Kaori Nakamura
- Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, Japan
| | - Shigehiko Tamura
- Faculty of Arts and Science, Kyushu University, Fukuoka, Japan.,Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, Japan
| | | | - Hiroshi Udo
- Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, Japan
| | - Toshihide Yamashita
- Department of Molecular Neuroscience, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Yukio Fujiki
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.,Institute of Rheological Functions of Food, Fukuoka, Japan
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15
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Borowicz P, Chan H, Hauge A, Spurkland A. Adaptor proteins: Flexible and dynamic modulators of immune cell signalling. Scand J Immunol 2020; 92:e12951. [DOI: 10.1111/sji.12951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/22/2020] [Accepted: 07/26/2020] [Indexed: 12/16/2022]
Affiliation(s)
- Paweł Borowicz
- Department of Molecular Medicine Institute of Basic Medical Sciences University of Oslo Oslo Norway
| | - Hanna Chan
- Department of Molecular Medicine Institute of Basic Medical Sciences University of Oslo Oslo Norway
| | - Anette Hauge
- Department of Molecular Medicine Institute of Basic Medical Sciences University of Oslo Oslo Norway
| | - Anne Spurkland
- Department of Molecular Medicine Institute of Basic Medical Sciences University of Oslo Oslo Norway
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16
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Demaret T, Roumain M, Ambroise J, Evraerts J, Ravau J, Bouzin C, Bearzatto B, Gala JL, Stepman H, Marie S, Vincent MF, Muccioli GG, Najimi M, Sokal EM. Longitudinal study of Pex1-G844D NMRI mouse model: A robust pre-clinical model for mild Zellweger spectrum disorder. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165900. [PMID: 32693164 DOI: 10.1016/j.bbadis.2020.165900] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 06/27/2020] [Accepted: 07/15/2020] [Indexed: 12/11/2022]
Abstract
Zellweger spectrum disorders (ZSD) are inborn errors of metabolism caused by mutations in PEX genes that lead to peroxisomal biogenesis disorder (PBD). No validated treatment is able to modify the dismal progression of the disease. ZSD mouse models used to develop therapeutic approaches are limited by poor survival and breeding restrictions. To overcome these limitations, we backcrossed the hypomorphic Pex1 p.G844D allele to NMRI background. NMRI mouse breeding restored an autosomal recessive Mendelian inheritance pattern and delivered twice larger litters. Mice were longitudinally phenotyped up to 6 months of age to make this model suitable for therapeutic interventions. ZSD mice exhibited growth retardation and relative hepatomegaly associated to progressive hepatocyte hypertrophy. Biochemical studies associated with RNA sequencing deciphered ZSD liver glycogen metabolism alterations. Affected fibroblasts displayed classical immunofluorescence pattern and biochemical alterations associated with PBD. Plasma and liver showed very long-chain fatty acids, specific oxysterols and C27 bile acids intermediates elevation in ZSD mice along with a specific urine organic acid profile. With ageing, C26 fatty acid and phytanic acid levels tended to normalize in ZSD mice, as described in patients reaching adulthood. In conclusion, our mouse model recapitulates a mild ZSD phenotype and is suitable for liver-targeted therapies evaluation.
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Affiliation(s)
- Tanguy Demaret
- Laboratoire d'Hépatologie Pédiatrique et Thérapie Cellulaire, Unité PEDI, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Martin Roumain
- Bioanalysis and Pharmacology of Bioactive Lipids Research Group (BPBL), Louvain Drug Research Institute (LDRI), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Jérôme Ambroise
- Center for Applied Molecular Technologies (CTMA), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Jonathan Evraerts
- Laboratoire d'Hépatologie Pédiatrique et Thérapie Cellulaire, Unité PEDI, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Joachim Ravau
- Laboratoire d'Hépatologie Pédiatrique et Thérapie Cellulaire, Unité PEDI, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Caroline Bouzin
- IREC Imaging Platform (2IP), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Bertrand Bearzatto
- Center for Applied Molecular Technologies (CTMA), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Jean-Luc Gala
- Center for Applied Molecular Technologies (CTMA), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Hedwig Stepman
- Department of Laboratory Medicine, Ghent University Hospital, 9000 Ghent, Belgium.
| | - Sandrine Marie
- Department of Laboratory Medicine, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Marie-Françoise Vincent
- Department of Laboratory Medicine, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Giulio G Muccioli
- Bioanalysis and Pharmacology of Bioactive Lipids Research Group (BPBL), Louvain Drug Research Institute (LDRI), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Mustapha Najimi
- Laboratoire d'Hépatologie Pédiatrique et Thérapie Cellulaire, Unité PEDI, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
| | - Etienne M Sokal
- Laboratoire d'Hépatologie Pédiatrique et Thérapie Cellulaire, Unité PEDI, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 1200 Brussels, Belgium.
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17
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Eberhart T, Schönenberger MJ, Walter KM, Charles KN, Faust PL, Kovacs WJ. Peroxisome-Deficiency and HIF-2α Signaling Are Negative Regulators of Ketohexokinase Expression. Front Cell Dev Biol 2020; 8:566. [PMID: 32733884 PMCID: PMC7360681 DOI: 10.3389/fcell.2020.00566] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 06/15/2020] [Indexed: 12/28/2022] Open
Abstract
Ketohexokinase (KHK) is the first and rate-limiting enzyme of fructose metabolism. Expression of the two alternatively spliced KHK isoforms, KHK-A and KHK-C, is tissue-specific and KHK-C is predominantly expressed in liver, kidney and intestine and responsible for the fructose-catabolizing function. While KHK isoform choice has been linked to the development of disorders such as obesity, diabetes, cardiovascular disease and cancer, little is known about the regulation of total KHK expression. In the present study, we investigated how hypoxic signaling influences fructose metabolism in the liver. Hypoxia or von Hippel-Lindau (VHL) tumor suppressor loss leads to the stabilization of hypoxia-inducible factors alpha (HIF-1α and HIF-2α) and the activation of their signaling to mediate adaptive responses. By studying liver-specific Vhl, Vhl/Hif1a, and Vhl/Epas1 knockout mice, we found that KHK expression is suppressed by HIF-2α (encoded by Epas1) but not by HIF-1α signaling on mRNA and protein levels. Reduced KHK levels were accompanied by downregulation of aldolase B (ALDOB) in the livers of Vhl and Vhl/Hif1a knockout mice, further indicating inhibited fructose metabolism. HIF-1α and HIF-2α have both overlapping and distinct target genes but are differentially regulated depending on the cell type and physiologic or pathologic conditions. HIF-2α activation augments peroxisome degradation in mammalian cells by pexophagy and thereby changes lipid composition reminiscent of peroxisomal disorders. We further demonstrated that fructose metabolism is negatively regulated by peroxisome-deficiency in a Pex2 knockout Zellweger mouse model, which lacks functional peroxisomes and is characterized by widespread metabolic dysfunction. Repression of fructolytic genes in Pex2 knockout mice appeared to be independent of PPARα signaling and nutritional status. Interestingly, our results demonstrate that both HIF-2α and peroxisome-deficiency result in downregulation of Khk independent of splicing as both isoforms, Khka as well as Khkc, are significantly downregulated. Hence, our study offers new and unexpected insights into the general regulation of KHK, and therefore fructolysis. We revealed a novel regulatory function of HIF-2α, suggesting that HIF-1α and HIF-2α have tissue-specific opposing roles in the regulation of Khk expression, isoform choice and fructolysis. In addition, we discovered a previously unknown function of peroxisomes in the regulation of fructose metabolism.
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Affiliation(s)
- Tanja Eberhart
- Institute of Molecular Health Sciences, ETH Zürich, Zurich, Switzerland
| | | | | | - Khanichi N. Charles
- Department of Biology, San Diego State University, San Diego, CA, United States
| | - Phyllis L. Faust
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, United States
| | - Werner J. Kovacs
- Institute of Molecular Health Sciences, ETH Zürich, Zurich, Switzerland
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18
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Hepatocyte-specific deletion of peroxisomal protein PEX13 results in disrupted iron homeostasis. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165882. [PMID: 32565019 DOI: 10.1016/j.bbadis.2020.165882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 05/11/2020] [Accepted: 06/16/2020] [Indexed: 12/31/2022]
Abstract
Peroxisomes are organelles, abundant in the liver, involved in a variety of cellular functions, including fatty acid metabolism, plasmalogen synthesis and metabolism of reactive oxygen species. Several inherited disorders are associated with peroxisomal dysfunction; increasingly many are associated with hepatic pathologies. The liver plays a principal role in regulation of iron metabolism. In this study we examined the possibility of a relationship between iron homeostasis and peroxisomal integrity. We examined the effect of deleting Pex13 in mouse liver on systemic iron homeostasis. We also used siRNA-mediated knock-down of PEX13 in a human hepatoma cell line (HepG2/C3A) to elucidate the mechanisms of PEX13-mediated regulation of hepcidin. We demonstrate that transgenic mice lacking hepatocyte Pex13 have defects in systemic iron homeostasis. The ablation of Pex13 expression in hepatocytes leads to a significant reduction in hepatic hepcidin levels. Our results also demonstrate that a deficiency of PEX13 gene expression in HepG2/C3A cells leads to decreased hepcidin expression, which is mediated through an increase in the signalling protein SMAD7, and endoplasmic reticulum (ER) stress. This study identifies a novel role for a protein involved in maintaining peroxisomal integrity and function in iron homeostasis. Loss of Pex13, a protein important for peroxisomal function, in hepatocytes leads to a significant increase in ER stress, which if unresolved, can affect liver function. The results from this study have implications for the management of patients with peroxisomal disorders and the liver-related complications they may develop.
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19
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Fujiki Y, Abe Y, Imoto Y, Tanaka AJ, Okumoto K, Honsho M, Tamura S, Miyata N, Yamashita T, Chung WK, Kuroiwa T. Recent insights into peroxisome biogenesis and associated diseases. J Cell Sci 2020; 133:133/9/jcs236943. [PMID: 32393673 DOI: 10.1242/jcs.236943] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Peroxisomes are single-membrane organelles present in eukaryotes. The functional importance of peroxisomes in humans is represented by peroxisome-deficient peroxisome biogenesis disorders (PBDs), including Zellweger syndrome. Defects in the genes that encode the 14 peroxins that are required for peroxisomal membrane assembly, matrix protein import and division have been identified in PBDs. A number of recent findings have advanced our understanding of the biology, physiology and consequences of functional defects in peroxisomes. In this Review, we discuss a cooperative cell defense mechanisms against oxidative stress that involves the localization of BAK (also known as BAK1) to peroxisomes, which alters peroxisomal membrane permeability, resulting in the export of catalase, a peroxisomal enzyme. Another important recent finding is the discovery of a nucleoside diphosphate kinase-like protein that has been shown to be essential for how the energy GTP is generated and provided for the fission of peroxisomes. With regard to PBDs, we newly identified a mild mutation, Pex26-F51L that causes only hearing loss. We will also discuss findings from a new PBD model mouse defective in Pex14, which manifested dysregulation of the BDNF-TrkB pathway, an essential signaling pathway in cerebellar morphogenesis. Here, we thus aim to provide a current view of peroxisome biogenesis and the molecular pathogenesis of PBDs.
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Affiliation(s)
- Yukio Fujiki
- Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Yuichi Abe
- Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Yuuta Imoto
- Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Akemi J Tanaka
- Department of Pediatrics, Columbia University Medical Center, New York, New York 10019, USA
| | - Kanji Okumoto
- Department of Biology, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan
| | - Masanori Honsho
- Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Shigehiko Tamura
- Faculty of Arts and Science, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan
| | - Non Miyata
- Chemistry, Faculty of Sciences, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan
| | - Toshihide Yamashita
- Department of Molecular Neuroscience, Graduate School of Medicine, Osaka University, 2-2 Yamada-oka, Suita, Osaka 565-0871
| | - Wendy K Chung
- Department of Pediatrics, Columbia University Medical Center, New York, New York 10019, USA
| | - Tsuneyoshi Kuroiwa
- Department of Chemical and Biological Science, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan
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20
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Stamatakou E, Wróbel L, Hill SM, Puri C, Son SM, Fujimaki M, Zhu Y, Siddiqi F, Fernandez-Estevez M, Manni MM, Park SJ, Villeneuve J, Rubinsztein DC. Mendelian neurodegenerative disease genes involved in autophagy. Cell Discov 2020; 6:24. [PMID: 32377374 PMCID: PMC7198619 DOI: 10.1038/s41421-020-0158-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 03/11/2020] [Indexed: 12/13/2022] Open
Abstract
The lysosomal degradation pathway of macroautophagy (herein referred to as autophagy) plays a crucial role in cellular physiology by regulating the removal of unwanted cargoes such as protein aggregates and damaged organelles. Over the last five decades, significant progress has been made in understanding the molecular mechanisms that regulate autophagy and its roles in human physiology and diseases. These advances, together with discoveries in human genetics linking autophagy-related gene mutations to specific diseases, provide a better understanding of the mechanisms by which autophagy-dependent pathways can be potentially targeted for treating human diseases. Here, we review mutations that have been identified in genes involved in autophagy and their associations with neurodegenerative diseases.
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Affiliation(s)
- Eleanna Stamatakou
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Lidia Wróbel
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Sandra Malmgren Hill
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Claudia Puri
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Sung Min Son
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Motoki Fujimaki
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Ye Zhu
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Farah Siddiqi
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Marian Fernandez-Estevez
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Marco M. Manni
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - So Jung Park
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - Julien Villeneuve
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
| | - David Chaim Rubinsztein
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, CB2 0XY UK
- UK Dementia Research Institute, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0XY UK
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21
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Abe Y, Honsho M, Kawaguchi R, Matsuzaki T, Ichiki Y, Fujitani M, Fujiwara K, Hirokane M, Oku M, Sakai Y, Yamashita T, Fujiki Y. A peroxisome deficiency-induced reductive cytosol state up-regulates the brain-derived neurotrophic factor pathway. J Biol Chem 2020; 295:5321-5334. [PMID: 32165495 PMCID: PMC7170515 DOI: 10.1074/jbc.ra119.011989] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 03/06/2020] [Indexed: 02/02/2023] Open
Abstract
The peroxisome is a subcellular organelle that functions in essential metabolic pathways, including biosynthesis of plasmalogens, fatty acid β-oxidation of very-long-chain fatty acids, and degradation of hydrogen peroxide. Peroxisome biogenesis disorders (PBDs) manifest as severe dysfunction in multiple organs, including the central nervous system (CNS), but the pathogenic mechanisms in PBDs are largely unknown. Because CNS integrity is coordinately established and maintained by neural cell interactions, we here investigated whether cell-cell communication is impaired and responsible for the neurological defects associated with PBDs. Results from a noncontact co-culture system consisting of primary hippocampal neurons with glial cells revealed that a peroxisome-deficient astrocytic cell line secretes increased levels of brain-derived neurotrophic factor (BDNF), resulting in axonal branching of the neurons. Of note, the BDNF expression in astrocytes was not affected by defects in plasmalogen biosynthesis and peroxisomal fatty acid β-oxidation in the astrocytes. Instead, we found that cytosolic reductive states caused by a mislocalized catalase in the peroxisome-deficient cells induce the elevation in BDNF secretion. Our results suggest that peroxisome deficiency dysregulates neuronal axogenesis by causing a cytosolic reductive state in astrocytes. We conclude that astrocytic peroxisomes regulate BDNF expression and thereby support neuronal integrity and function.
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Affiliation(s)
- Yuichi Abe
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Fukuoka 812-8582, Japan; Faculty of Arts and Science, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
| | - Masanori Honsho
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Fukuoka 812-8582, Japan; Institute of Rheological Functions of Food, Hisayama-machi, Fukuoka 811-2501, Japan
| | - Ryoko Kawaguchi
- Graduate School of Systems Life Sciences, Kyushu University Graduate School, 744 Motooka, Fukuoka 819-0395, Japan
| | - Takashi Matsuzaki
- Department of Biology, Faculty of Sciences, Kyushu University Graduate School, 744 Motooka, Fukuoka 819-0395, Japan
| | - Yayoi Ichiki
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Masashi Fujitani
- Department of Molecular Neuroscience, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan; Department of Anatomy and Neuroscience, Faculty of Medicine, Shimane University, Izumo, Shimane 693-8501, Japan
| | - Kazushirou Fujiwara
- Graduate School of Systems Life Sciences, Kyushu University Graduate School, 744 Motooka, Fukuoka 819-0395, Japan
| | - Masaaki Hirokane
- Graduate School of Systems Life Sciences, Kyushu University Graduate School, 744 Motooka, Fukuoka 819-0395, Japan
| | - Masahide Oku
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yasuyoshi Sakai
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Toshihide Yamashita
- Department of Molecular Neuroscience, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan; Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Yukio Fujiki
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Fukuoka 812-8582, Japan; Institute of Rheological Functions of Food, Hisayama-machi, Fukuoka 811-2501, Japan.
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22
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Abe Y, Tamura S, Honsho M, Fujiki Y. A Mouse Model System to Study Peroxisomal Roles in Neurodegeneration of Peroxisome Biogenesis Disorders. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1299:119-143. [PMID: 33417212 DOI: 10.1007/978-3-030-60204-8_10] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Fourteen PEX genes are currently identified as genes responsible for peroxisome biogenesis disorders (PBDs). Patients with PBDs manifest as neurodegenerative symptoms such as neuronal migration defect and malformation of the cerebellum. To address molecular mechanisms underlying the pathogenesis of PBDs, mouse models for the PBDs have been generated by targeted disruption of Pex genes. Pathological phenotypes and metabolic abnormalities in Pex-knockout mice well resemble those of the patients with PBDs. The mice with tissue- or cell type-specific inactivation of Pex genes have also been established by using a Cre-loxP system. The genetically modified mice reveal that pathological phenotypes of PBDs are mediated by interorgan and intercellular communications. Despite the illustrations of detailed pathological phenotypes in the mutant mice, mechanistic insights into pathogenesis of PBDs are still underway. In this chapter, we overview the phenotypes of Pex-inactivated mice and the current understanding of the pathogenesis underlying PBDs.
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Affiliation(s)
- Yuichi Abe
- Faculty of Arts and Science, Kyushu University, Fukuoka, Japan
| | | | | | - Yukio Fujiki
- Institute of Rheological Functions of Food, Fukuoka, Japan. .,Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
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23
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Antolic A, Richards EM, Wood CE, Keller-Wood M. A Transcriptomic Model of Postnatal Cardiac Effects of Prenatal Maternal Cortisol Excess in Sheep. Front Physiol 2019; 10:816. [PMID: 31333485 PMCID: PMC6616147 DOI: 10.3389/fphys.2019.00816] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 06/11/2019] [Indexed: 12/25/2022] Open
Abstract
In utero treatment with glucocorticoids have been suggested to reprogram postnatal cardiovascular function and stress responsiveness. However, little is known about the effects of prenatal exposure to the natural corticosteroid, cortisol, on postnatal cardiovascular system or metabolism. We have demonstrated an increased incidence of stillbirth in sheep pregnancies in which there is mild maternal hypercortisolemia caused by infusion of 1 mg/kg/d cortisol. In order to model corticosteroid effects in the neonate, we created a second model in which cortisol was infused for 12 h per day for a daily infusion of 0.5 mg/kg/d. In this model we had previously found that neonatal plasma glucose was increased and plasma insulin was decreased compared to those in the control group, and that neonatal ponderal index and kidney weight were reduced and left ventricular wall thickness was increased in the 2 week old lamb. In this study, we have used transcriptomic modeling to better understand the programming effect of this maternal hypercortisolemia in these hearts. This is a time when both terminal differentiation and a shift in the metabolism of the heart from carbohydrates to lipid oxidation are thought to be complete. The transcriptomic model indicates suppression of genes in pathways for fatty acid and ketone production and upregulation of genes in pathways for angiogenesis in the epicardial adipose fat (EAT). The transcriptomic model indicates that RNA related pathways are overrepresented by downregulated genes, but ubiquitin-mediated proteolysis and protein targeting to the mitochondria are overrepresented by upregulated genes in the intraventricular septum (IVS) and left ventricle (LV). In IVS the AMPK pathway and adipocytokine signaling pathways were also modeled based on overrepresentation by downregulated genes. Peroxisomal activity is modeled as increased in EAT, but decreased in LV and IVS. Our results suggest that pathways for lipids as well as cell proliferation and cardiac remodeling have altered activity postnatally after the in utero cortisol exposure. Together, this model is consistent with the observed increase in cardiac wall thickness at necropsy and altered glucose metabolism observed in vivo, and predicts that in utero exposure to excess maternal cortisol will cause postnatal cardiac hypertrophy and altered responses to oxidative stress.
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Affiliation(s)
- Andrew Antolic
- Department of Pharmacodynamics, University of Florida, Gainesville, FL, United States
| | - Elaine M Richards
- Department of Pharmacodynamics, University of Florida, Gainesville, FL, United States.,Department of Physiology and Functional Genomics, University of Florida, Gainesville, FL, United States
| | - Charles E Wood
- Department of Physiology and Functional Genomics, University of Florida, Gainesville, FL, United States
| | - Maureen Keller-Wood
- Department of Pharmacodynamics, University of Florida, Gainesville, FL, United States
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24
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A defect in the peroxisomal biogenesis in germ cells induces a spermatogenic arrest at the round spermatid stage in mice. Sci Rep 2019; 9:9553. [PMID: 31267012 PMCID: PMC6606614 DOI: 10.1038/s41598-019-45991-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 06/18/2019] [Indexed: 12/14/2022] Open
Abstract
Peroxisomes are involved in the degradation of very long-chain fatty acids (VLCFAs) by β-oxidation. Besides neurological defects, peroxisomal dysfunction can also lead to testicular abnormalities. However, underlying alterations in the testes due to a peroxisomal defect are not well characterized yet. To maintain all metabolic functions, peroxisomes require an import machinery for the transport of matrix proteins. One component of this translocation machinery is PEX13. Its inactivation leads to a peroxisomal biogenesis defect. We have established a germ cell-specific KO of Pex13 to study the function of peroxisomes during spermatogenesis in mice. Exon 2 of floxed Pex13 was specifically excised in germ cells prior to meiosis by using a transgenic mouse strain carrying a STRA8 inducible Cre recombinase. Germ cell differentiation was interrupted at the round spermatid stage in Pex13 KO mice with formation of multinucleated giant cells (MNCs) and loss of mature spermatids. Due to a different cellular content in the germinal epithelium of Pex13 KO testes compared to control, whole testes biopsies were used for the analyses. Thus, differences in lipid composition and gene expression are only shown for whole testicular tissue but cannot be limited to single cells. Gas chromatography revealed an increase of shorter fatty acids and a decrease of n-6 docosapentaenoic acid (C22:5n-6) and n-3 docosahexaenoic acid (C22:6n-3), the main components of sperm plasma membranes. Representative genes of the metabolite transport and peroxisomal β-oxidation were strongly down-regulated. In addition, structural components of the blood-testis barrier (BTB) were altered. To conclude, defects in the peroxisomal compartment interfere with normal spermatogenesis.
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25
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Berendse K, Boek M, Gijbels M, Van der Wel NN, Klouwer FC, van den Bergh-Weerman MA, Shinde AB, Ofman R, Poll-The BT, Houten SM, Baes M, Wanders RJA, Waterham HR. Liver disease predominates in a mouse model for mild human Zellweger spectrum disorder. Biochim Biophys Acta Mol Basis Dis 2019; 1865:2774-2787. [PMID: 31207289 DOI: 10.1016/j.bbadis.2019.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 05/28/2019] [Accepted: 06/12/2019] [Indexed: 11/29/2022]
Abstract
Zellweger spectrum disorders (ZSDs) are autosomal recessive diseases caused by defective peroxisome assembly. They constitute a clinical continuum from severe early lethal to relatively milder presentations in adulthood. Liver disease is a prevalent symptom in ZSD patients. The underlying pathogenesis for the liver disease, however, is not fully understood. We report a hypomorphic ZSD mouse model, which is homozygous for Pex1-c.2531G>A (p.G844D), the equivalent of the most common pathogenic variant found in ZSD, and which predominantly presents with liver disease. After introducing the Pex1-G844D allele by knock-in, we characterized homozygous Pex1-G844D mice for survival, biochemical parameters, including peroxisomal and mitochondrial functions, organ histology, and developmental parameters. The first 20 post-natal days (P20) were critical for survival of homozygous Pex1-G844D mice (~20% survival rate). Lethality was likely due to a combination of cholestatic liver problems, liver dysfunction and caloric deficit, probably as a consequence of defective bile acid biosynthesis. Survival beyond P20 was nearly 100%, but surviving mice showed a marked delay in growth. Surviving mice showed similar hepatic problems as described for mild ZSD patients, including hepatomegaly, bile duct proliferation, liver fibrosis and mitochondrial alterations. Biochemical analyses of various tissues showed the absence of functional peroxisomes accompanied with aberrant levels of peroxisomal metabolites predominantly in the liver, while other tissues were relatively spared. ur findings show that homozygous Pex1-G844D mice have a predominant liver disease phenotype, mimicking the hepatic pathology of ZSD patients, and thus constitute a good model to study pathogenesis and treatment of liver disease in ZSD patients.
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Affiliation(s)
- Kevin Berendse
- Amsterdam UMC, University of Amsterdam, Laboratory Genetic Metabolic Diseases, Amsterdam Gastroenterology & Metabolism, the Netherlands; Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Paediatric Neurology, the Netherlands
| | - Maxim Boek
- Amsterdam UMC, University of Amsterdam, Laboratory Genetic Metabolic Diseases, Amsterdam Gastroenterology & Metabolism, the Netherlands
| | - Marion Gijbels
- Department of Molecular Genetics, Cardiovascular Research Institute Maastricht, University of Maastricht, the Netherlands
| | | | - Femke C Klouwer
- Amsterdam UMC, University of Amsterdam, Laboratory Genetic Metabolic Diseases, Amsterdam Gastroenterology & Metabolism, the Netherlands; Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Paediatric Neurology, the Netherlands
| | | | - Abhijit Babaji Shinde
- Department of Pharmaceutical and Pharmacological Sciences, Laboratory of Cell Metabolism, University of Leuven, Belgium
| | - Rob Ofman
- Amsterdam UMC, University of Amsterdam, Laboratory Genetic Metabolic Diseases, Amsterdam Gastroenterology & Metabolism, the Netherlands
| | - Bwee Tien Poll-The
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Paediatric Neurology, the Netherlands
| | - Sander M Houten
- Department of Genetics and Genomic Sciences, Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Myriam Baes
- Department of Pharmaceutical and Pharmacological Sciences, Laboratory of Cell Metabolism, University of Leuven, Belgium
| | - Ronald J A Wanders
- Amsterdam UMC, University of Amsterdam, Laboratory Genetic Metabolic Diseases, Amsterdam Gastroenterology & Metabolism, the Netherlands
| | - Hans R Waterham
- Amsterdam UMC, University of Amsterdam, Laboratory Genetic Metabolic Diseases, Amsterdam Gastroenterology & Metabolism, the Netherlands.
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26
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Tanaka H, Okazaki T, Aoyama S, Yokota M, Koike M, Okada Y, Fujiki Y, Gotoh Y. Peroxisomes control mitochondrial dynamics and the mitochondrion-dependent pathway of apoptosis. J Cell Sci 2019; 132:jcs.224766. [DOI: 10.1242/jcs.224766] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 05/01/2019] [Indexed: 01/03/2023] Open
Abstract
Peroxisomes cooperate with mitochondria in the performance of cellular metabolic functions such as fatty acid oxidation and maintenance of redox homeostasis. Whether peroxisomes also regulate mitochondrial fission-fusion dynamics or mitochondrion-dependent apoptosis has remained unclear, however. We now show that genetic ablation of the peroxins Pex3 or Pex5, which are essential for peroxisome biogenesis, resulted in mitochondrial fragmentation in MEFs in a manner dependent on Drp1. Conversely, treatment with 4-PBA, a peroxisome proliferator, resulted in mitochondrial elongation in wild-type MEFs, but not in Pex3-deficient MEFs. We further found that peroxisome deficiency increased the levels of cytosolic cytochrome c and caspase activity under basal conditions without inducing apoptosis. It also greatly enhanced etoposide-induced caspase activation and apoptosis, indicative of an enhanced cellular sensitivity to death signals. Together, our data unveil a previously unrecognized role of peroxisomes in the regulation of mitochondrial dynamics and mitochondrion-dependent apoptosis. Effects of peroxin genes mutations on mitochondrion-dependent apoptosis may contribute to pathogenesis of peroxisome biogenesis disorders.
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Affiliation(s)
- Hideaki Tanaka
- Graduate School of Pharmaceutical Sciences, IRCN, The University of Tokyo, Tokyo 113-0033, Japan
| | - Tomohiko Okazaki
- Graduate School of Pharmaceutical Sciences, IRCN, The University of Tokyo, Tokyo 113-0033, Japan
| | - Saeko Aoyama
- Graduate School of Pharmaceutical Sciences, IRCN, The University of Tokyo, Tokyo 113-0033, Japan
| | - Mutsumi Yokota
- Department of Cell Biology and Neuroscience, Juntendo University School of Medicine, Tokyo 113-8421, Japan
| | - Masato Koike
- Department of Cell Biology and Neuroscience, Juntendo University School of Medicine, Tokyo 113-8421, Japan
| | - Yasushi Okada
- Laboratory for Cell Dynamics Observation, Center for Biosystems Dynamics Research (BDR), RIKEN, Osaka 565-0874, Japan
- Department of Physics, Universal Biology Institute (UBI), and the International Research Center for Neurointelligence (WPI-IRCN), The University of Tokyo, Tokyo 113-0033, Japan
| | - Yukio Fujiki
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Yukiko Gotoh
- Graduate School of Pharmaceutical Sciences, IRCN, The University of Tokyo, Tokyo 113-0033, Japan
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27
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Chen C, Wang H, Chen B, Chen D, Lu C, Li H, Qian Y, Tan Y, Weng H, Cai L. Pex11a deficiency causes dyslipidaemia and obesity in mice. J Cell Mol Med 2018; 23:2020-2031. [PMID: 30585412 PMCID: PMC6378206 DOI: 10.1111/jcmm.14108] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 11/20/2018] [Accepted: 12/03/2018] [Indexed: 11/29/2022] Open
Abstract
Peroxisomes play a central role in lipid metabolism. We previously demonstrated that Pex11a deficiency impairs peroxisome abundance and fatty acid β‐oxidation and results in hepatic triglyceride accumulation. The role of Pex11a in dyslipidaemia and obesity is investigated here with Pex11a knockout mice (Pex11a−/−). Metabolic phenotypes including tissue weight, glucose tolerance, insulin sensitivity, cholesterol levels, fatty acid profile, oxygen consumption, physical activity were assessed in wild‐type (WT) and Pex11a−/− fed with a high‐fat diet. Molecular changes and peroxisome abundance in adipose tissue were evaluated through qRT‐PCR, Western blotting, and Immunofluorescence. Pex11a−/− showed increased fat mass, decreased skeletal muscle, higher cholesterol levels, and more severely impaired glucose and insulin tolerance. Pex11a−/− consumed less oxygen, indicating a decrease in fatty acid oxidation, which is consistent with the accumulation of very long‐ and long‐chain fatty acids. Adipose palmitic acid (C16:0) levels were elevated in Pex11a−/−, which may be because of dramatically increased fatty acid synthase mRNA and protein levels. Furthermore, Pex11a deficiency increased ventricle size and macrophage infiltration, which are related to the reduced physical activity. These data demonstrate that Pex11a deficiency impairs physical activity and energy expenditure, decreases fatty acid β‐oxidation, increases de novo lipogenesis and results in dyslipidaemia and obesity.
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Affiliation(s)
- Congcong Chen
- Chinese-American Research Institute for Pediatrics & Department of Pediatrics, The First Affiliated Hospital of Wenzhou Medical University, Chashan University-Town, Wenzhou, China.,Department of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China.,Department of Pharmacy, Jinhua Central Hospital, Jinhua, China
| | - Hongwei Wang
- Hepatobiliary and Pancreatic Surgery Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Bicheng Chen
- Hepatobiliary and Pancreatic Surgery Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Deyuan Chen
- Department of Pathology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Chaosheng Lu
- Chinese-American Research Institute for Pediatrics & Department of Pediatrics, The First Affiliated Hospital of Wenzhou Medical University, Chashan University-Town, Wenzhou, China
| | - Haiyan Li
- Chinese-American Research Institute for Pediatrics & Department of Pediatrics, The First Affiliated Hospital of Wenzhou Medical University, Chashan University-Town, Wenzhou, China
| | - Yan Qian
- Chinese-American Research Institute for Pediatrics & Department of Pediatrics, The First Affiliated Hospital of Wenzhou Medical University, Chashan University-Town, Wenzhou, China
| | - Yi Tan
- Chinese-American Research Institute for Pediatrics & Department of Pediatrics, The First Affiliated Hospital of Wenzhou Medical University, Chashan University-Town, Wenzhou, China.,Department of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China.,Pediatric Research Institute, Departments of Pediatrics, Radiation Oncology, Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky
| | - Huachun Weng
- Chinese-American Research Institute for Pediatrics & Department of Pediatrics, The First Affiliated Hospital of Wenzhou Medical University, Chashan University-Town, Wenzhou, China
| | - Lu Cai
- Chinese-American Research Institute for Pediatrics & Department of Pediatrics, The First Affiliated Hospital of Wenzhou Medical University, Chashan University-Town, Wenzhou, China.,Department of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China.,Pediatric Research Institute, Departments of Pediatrics, Radiation Oncology, Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky
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28
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Abe Y, Honsho M, Itoh R, Kawaguchi R, Fujitani M, Fujiwara K, Hirokane M, Matsuzaki T, Nakayama K, Ohgi R, Marutani T, Nakayama KI, Yamashita T, Fujiki Y. Peroxisome biogenesis deficiency attenuates the BDNF-TrkB pathway-mediated development of the cerebellum. Life Sci Alliance 2018; 1:e201800062. [PMID: 30519675 PMCID: PMC6277683 DOI: 10.26508/lsa.201800062] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 11/08/2018] [Accepted: 11/08/2018] [Indexed: 01/22/2023] Open
Abstract
Peroxisome biogenesis disorders (PBDs) manifest as neurological deficits in the central nervous system, including neuronal migration defects and abnormal cerebellum development. However, the mechanisms underlying pathogenesis remain enigmatic. Here, to investigate how peroxisome deficiency causes neurological defects of PBDs, we established a new PBD model mouse defective in peroxisome assembly factor Pex14p, termed Pex14 ΔC/ΔC mouse. Pex14 ΔC/ΔC mouse manifests a severe symptom such as disorganization of cortical laminar structure and dies shortly after birth, although peroxisomal biogenesis and metabolism are partially defective. The Pex14 ΔC/ΔC mouse also shows malformation of the cerebellum including the impaired dendritic development of Purkinje cells. Moreover, extracellular signal-regulated kinase and AKT signaling are attenuated in this mutant mouse by an elevated level of brain-derived neurotrophic factor (BDNF) together with the enhanced expression of TrkB-T1, a dominant-negative isoform of the BDNF receptor. Our results suggest that dysregulation of the BDNF-TrkB pathway, an essential signaling for cerebellar morphogenesis, gives rise to the pathogenesis of the cerebellum in PBDs.
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Affiliation(s)
- Yuichi Abe
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Masanori Honsho
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Ryota Itoh
- Graduate School of Systems Life Sciences and Department of Biology, Faculty of Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Ryoko Kawaguchi
- Graduate School of Systems Life Sciences and Department of Biology, Faculty of Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Masashi Fujitani
- Department of Molecular Neuroscience, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Kazushirou Fujiwara
- Graduate School of Systems Life Sciences and Department of Biology, Faculty of Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Masaaki Hirokane
- Graduate School of Systems Life Sciences and Department of Biology, Faculty of Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Takashi Matsuzaki
- Graduate School of Systems Life Sciences and Department of Biology, Faculty of Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Keiko Nakayama
- Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.,Division of Cell Proliferation, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Ryohei Ohgi
- Graduate School of Systems Life Sciences and Department of Biology, Faculty of Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Toshihiro Marutani
- Graduate School of Systems Life Sciences and Department of Biology, Faculty of Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Keiichi I Nakayama
- Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Toshihide Yamashita
- Department of Molecular Neuroscience, Graduate School of Medicine, Osaka University, Osaka, Japan.,Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Tokyo, Japan
| | - Yukio Fujiki
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
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29
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Rahim RS, St John JA, Crane DI, Meedeniya ACB. Impaired neurogenesis and associated gliosis in mouse brain with PEX13 deficiency. Mol Cell Neurosci 2017; 88:16-32. [PMID: 29187321 DOI: 10.1016/j.mcn.2017.11.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 11/04/2017] [Accepted: 11/24/2017] [Indexed: 12/23/2022] Open
Abstract
Zellweger syndrome (ZS), a neonatal lethal disorder arising from defective peroxisome biogenesis, features profound neuroanatomical abnormalities and brain dysfunction. Here we used mice with brain-restricted inactivation of the peroxisome biogenesis gene PEX13 to model the pathophysiological features of ZS, and determine the impact of peroxisome dysfunction on neurogenesis and cell maturation in ZS. In the embryonic and postnatal PEX13 mutant brain, we demonstrate key regions with altered brain anatomy, including enlarged lateral ventricles and aberrant cortical, hippocampal and hypothalamic organization. To characterize the underlying mechanisms, we show a significant reduction in proliferation, migration, differentiation, and maturation of neural progenitors in embryonic E12.5 through to P3 animals. An increasing reactive gliosis in the PEX13 mutant brain started at E14.5 in association with the pathology. Together with impaired neurogenesis and associated gliosis, our data demonstrate increased cell death contributing to the hallmark brain anatomy of ZS. We provide unique data where impaired neurogenesis and migration are shown as critical events underlying the neuropathology and altered brain function of mice with peroxisome deficiency.
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Affiliation(s)
- Rani Sadia Rahim
- Griffith Institute for Drug Discovery, School of Natural Sciences, Griffith University, Qld, Australia
| | - James A St John
- Griffith Institute for Drug Discovery, School of Natural Sciences, Griffith University, Qld, Australia; Clem Jones Centre for Neurobiology and Stem Cell Research, Australia; Menzies Health Institute Queensland, Griffith University, Qld, Australia
| | - Denis I Crane
- Griffith Institute for Drug Discovery, School of Natural Sciences, Griffith University, Qld, Australia.
| | - Adrian C B Meedeniya
- Menzies Health Institute Queensland, Griffith University, Qld, Australia; Interdisciplinary Centre for Innovations in Biotechnology & Neurosciences, University of Sri Jayawardenepura, Nugegoda, Sri Lanka.
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30
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Colasante C, Chen J, Ahlemeyer B, Baumgart-Vogt E. Peroxisomes in cardiomyocytes and the peroxisome / peroxisome proliferator-activated receptor-loop. Thromb Haemost 2017; 113:452-63. [DOI: 10.1160/th14-06-0497] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 12/18/2014] [Indexed: 01/29/2023]
Abstract
SummaryIt is well established that the heart is strongly dependent on fatty acid metabolism. In cardiomyocytes there are two distinct sites for the β-oxidisation of fatty acids: the mitochondrion and the peroxisome. Although the metabolism of these two organelles is believed to be tightly coupled, the nature of this relationship has not been fully investigated. Recent research has established the significant contribution of mitochondrial function to cardiac ATP production under normal and pathological conditions. In contrast, limited information is available on peroxisomal function in the heart. This is despite these organelles harbouring metabolic pathways that are potentially cardioprotective, and findings that patients with peroxisomal diseases, such as adult Refsum’s disease, can develop heart failure. In this article, we provide a comprehensive overview on the current knowledge of peroxisomes and the regulation of lipid metabolism by PPARs in cardiomyocytes. We also present new experimental evidence on the differential expression of peroxisome-related genes in the heart chambers and demonstrate that even a mild peroxisomal biogenesis defect (Pex11α-/- ) can induce profound alterations in the cardiomyocyte’s peroxisomal compartment and related gene expression, including the concomitant deregulation of specific PPARs. The possible impact of peroxisomal dysfunction in the heart is discussed and a model for the modulation of myocardial metabolism via a peroxisome/PPAR-loop is proposed.
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31
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Nock TG, Chouinard-Watkins R, Plourde M. Carriers of an apolipoprotein E epsilon 4 allele are more vulnerable to a dietary deficiency in omega-3 fatty acids and cognitive decline. Biochim Biophys Acta Mol Cell Biol Lipids 2017; 1862:1068-1078. [PMID: 28733268 DOI: 10.1016/j.bbalip.2017.07.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Revised: 07/05/2017] [Accepted: 07/15/2017] [Indexed: 01/29/2023]
Abstract
Carriers of an epsilon 4 allele (E4) of apolipoprotein E (APOE) develop Alzheimer's disease (AD) earlier than carriers of other APOE alleles. The metabolism of plasma docosahexaenoic acid (DHA, 22:6n-3), an omega-3 fatty acid (n-3 FA), taken up by the brain and concentrated in neurons, is disrupted in E4 carriers, resulting in lower levels of brain DHA. Behavioural and cognitive impairments have been observed in animals with lower brain DHA levels, with emphasis on loss of spatial memory and increased anxiety. E4 mice provided a diet deficient in n-3 FA had a greater depletion of n-3 FA levels in organs and tissues than mice carrying other APOE alleles. However, providing n-3 FA can restore levels of brain DHA in E4 animals and in other models of n-3 FA deficiency. In E4 carriers, supplementation with DHA as early as possible might help to prevent the onset of AD and could halt the progression of, and reverse some of the neurological and behavioural consequences of their higher vulnerability to n-3 FA deficiency.
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Affiliation(s)
- Tanya Gwendolyn Nock
- Research Center on Aging, Centre Intégré Universitaire de Santé et Services Sociaux de l'Estrie-Centre Hospitalier Universitaire de Sherbrooke, Canada; Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Canada; Institute of Nutrition and Functional Foods, Quebec City, Canada
| | - Raphaël Chouinard-Watkins
- Research Center on Aging, Centre Intégré Universitaire de Santé et Services Sociaux de l'Estrie-Centre Hospitalier Universitaire de Sherbrooke, Canada; Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Canada; Institute of Nutrition and Functional Foods, Quebec City, Canada
| | - Mélanie Plourde
- Research Center on Aging, Centre Intégré Universitaire de Santé et Services Sociaux de l'Estrie-Centre Hospitalier Universitaire de Sherbrooke, Canada; Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Canada; Institute of Nutrition and Functional Foods, Quebec City, Canada.
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32
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Wangler MF, Chao YH, Bayat V, Giagtzoglou N, Shinde AB, Putluri N, Coarfa C, Donti T, Graham BH, Faust JE, McNew JA, Moser A, Sardiello M, Baes M, Bellen HJ. Peroxisomal biogenesis is genetically and biochemically linked to carbohydrate metabolism in Drosophila and mouse. PLoS Genet 2017; 13:e1006825. [PMID: 28640802 PMCID: PMC5480855 DOI: 10.1371/journal.pgen.1006825] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 05/16/2017] [Indexed: 01/07/2023] Open
Abstract
Peroxisome biogenesis disorders (PBD) are a group of multi-system human diseases due to mutations in the PEX genes that are responsible for peroxisome assembly and function. These disorders lead to global defects in peroxisomal function and result in severe brain, liver, bone and kidney disease. In order to study their pathogenesis we undertook a systematic genetic and biochemical study of Drosophila pex16 and pex2 mutants. These mutants are short-lived with defects in locomotion and activity. Moreover these mutants exhibit severe morphologic and functional peroxisomal defects. Using metabolomics we uncovered defects in multiple biochemical pathways including defects outside the canonical specialized lipid pathways performed by peroxisomal enzymes. These included unanticipated changes in metabolites in glycolysis, glycogen metabolism, and the pentose phosphate pathway, carbohydrate metabolic pathways that do not utilize known peroxisomal enzymes. In addition, mutant flies are starvation sensitive and are very sensitive to glucose deprivation exhibiting dramatic shortening of lifespan and hyperactivity on low-sugar food. We use bioinformatic transcriptional profiling to examine gene co-regulation between peroxisomal genes and other metabolic pathways and we observe that the expression of peroxisomal and carbohydrate pathway genes in flies and mouse are tightly correlated. Indeed key steps in carbohydrate metabolism were found to be strongly co-regulated with peroxisomal genes in flies and mice. Moreover mice lacking peroxisomes exhibit defective carbohydrate metabolism at the same key steps in carbohydrate breakdown. Our data indicate an unexpected link between these two metabolic processes and suggest metabolism of carbohydrates could be a new therapeutic target for patients with PBD.
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Affiliation(s)
- Michael F. Wangler
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX, United States of America
- Texas Children’s Hospital, Houston TX, United States of America
- Program in Developmental Biology, BCM, Houston, TX, United States of America
- Jan and Dan Duncan Neurological Research Institute, Texas Children’s Hospital (TCH), Houston, TX, United States of America
| | - Yu-Hsin Chao
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX, United States of America
| | - Vafa Bayat
- Program in Developmental Biology, BCM, Houston, TX, United States of America
| | - Nikolaos Giagtzoglou
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX, United States of America
| | - Abhijit Babaji Shinde
- KU Leuven, Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Leuven, Belgium
| | - Nagireddy Putluri
- Department of Molecular and Cellular Biology, BCM, Houston, TX, United States of America
| | - Cristian Coarfa
- Department of Molecular and Cellular Biology, BCM, Houston, TX, United States of America
| | - Taraka Donti
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX, United States of America
| | - Brett H. Graham
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX, United States of America
| | - Joseph E. Faust
- Department of BioSciences, Rice University, Houston TX, United States of America
| | - James A. McNew
- Department of BioSciences, Rice University, Houston TX, United States of America
| | - Ann Moser
- Kennedy Krieger Institute, Baltimore MD, United States of America
| | - Marco Sardiello
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX, United States of America
- Program in Developmental Biology, BCM, Houston, TX, United States of America
- Jan and Dan Duncan Neurological Research Institute, Texas Children’s Hospital (TCH), Houston, TX, United States of America
| | - Myriam Baes
- KU Leuven, Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, Leuven, Belgium
| | - Hugo J. Bellen
- Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Houston, TX, United States of America
- Texas Children’s Hospital, Houston TX, United States of America
- Program in Developmental Biology, BCM, Houston, TX, United States of America
- Jan and Dan Duncan Neurological Research Institute, Texas Children’s Hospital (TCH), Houston, TX, United States of America
- Howard Hughes Medical Institute, Houston, TX, United States of America
- Department of Neuroscience, BCM, Houston, TX, United States of America
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33
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Vijayan V, Srinu T, Karnati S, Garikapati V, Linke M, Kamalyan L, Mali SR, Sudan K, Kollas A, Schmid T, Schulz S, Spengler B, Weichhart T, Immenschuh S, Baumgart-Vogt E. A New Immunomodulatory Role for Peroxisomes in Macrophages Activated by the TLR4 Ligand Lipopolysaccharide. THE JOURNAL OF IMMUNOLOGY 2017; 198:2414-2425. [PMID: 28179495 DOI: 10.4049/jimmunol.1601596] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 01/16/2017] [Indexed: 01/11/2023]
Abstract
Peroxisomes are proposed to play an important role in the regulation of systemic inflammation; however, the functional role of these organelles in inflammatory responses of myeloid immune cells is largely unknown. In this article, we demonstrate that the nonclassical peroxisome proliferator 4-phenyl butyric acid is an efficient inducer of peroxisomes in various models of murine macrophages, such as primary alveolar and peritoneal macrophages and the macrophage cell line RAW264.7, but not in primary bone marrow-derived macrophages. Further, proliferation of peroxisomes blocked the TLR4 ligand LPS-induced proinflammatory response, as detected by the reduced induction of the proinflammatory protein cyclooxygenase (COX)-2 and the proinflammatory cytokines TNF-α, IL-6, and IL-12. In contrast, disturbing peroxisome function by knockdown of peroxisomal gene Pex14 or Mfp2 markedly increased the LPS-dependent upregulation of the proinflammatory proteins COX-2 and TNF-α. Specifically, induction of peroxisomes did not affect the upregulation of COX-2 at the mRNA level, but it reduced the half-life of COX-2 protein, which was restored by COX-2 enzyme inhibitors but not by proteasomal and lysosomal inhibitors. Liquid chromatography-tandem mass spectrometry analysis revealed that various anti-inflammatory lipid mediators (e.g., docosahexaenoic acid) were increased in the conditioned medium from peroxisome-induced macrophages, which blocked LPS-induced COX-2 upregulation in naive RAW264.7 cells and human primary peripheral blood-derived macrophages. Importantly, LPS itself induced peroxisomes that correlated with the regulation of COX-2 during the late phase of LPS activation in macrophages. In conclusion, our findings identify a previously unidentified role for peroxisomes in macrophage inflammatory responses and suggest that peroxisomes are involved in the physiological cessation of macrophage activation.
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Affiliation(s)
- Vijith Vijayan
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany.,Institute for Transfusion Medicine, Hannover Medical School, 30625 Hannover, Germany
| | - Tumpara Srinu
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Srikanth Karnati
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Vannuruswamy Garikapati
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany.,Institute of Inorganic and Analytical Chemistry, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Monika Linke
- Institute of Medical Genetics, Medical University of Vienna, 1090 Vienna, Austria; and
| | - Lilit Kamalyan
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Srihari Reddy Mali
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Kritika Sudan
- Institute for Transfusion Medicine, Hannover Medical School, 30625 Hannover, Germany
| | - Andreas Kollas
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Tobias Schmid
- Institute of Biochemistry I, Faculty of Medicine, Goethe University Frankfurt, 60596 Frankfurt, Germany
| | - Sabine Schulz
- Institute of Inorganic and Analytical Chemistry, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Bernhard Spengler
- Institute of Inorganic and Analytical Chemistry, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Thomas Weichhart
- Institute of Medical Genetics, Medical University of Vienna, 1090 Vienna, Austria; and
| | - Stephan Immenschuh
- Institute for Transfusion Medicine, Hannover Medical School, 30625 Hannover, Germany
| | - Eveline Baumgart-Vogt
- Institute for Anatomy and Cell Biology II, Medical Cell Biology, Justus Liebig University Giessen, 35392 Giessen, Germany;
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34
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Lee MY, Sumpter R, Zou Z, Sirasanagandla S, Wei Y, Mishra P, Rosewich H, Crane DI, Levine B. Peroxisomal protein PEX13 functions in selective autophagy. EMBO Rep 2016; 18:48-60. [PMID: 27827795 PMCID: PMC5210156 DOI: 10.15252/embr.201642443] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Revised: 10/04/2016] [Accepted: 10/07/2016] [Indexed: 11/24/2022] Open
Abstract
PEX13 is an integral membrane protein on the peroxisome that regulates peroxisomal matrix protein import during peroxisome biogenesis. Mutations in PEX13 and other peroxin proteins are associated with Zellweger syndrome spectrum (ZSS) disorders, a subtype of peroxisome biogenesis disorder characterized by prominent neurological, hepatic, and renal abnormalities leading to neonatal death. The lack of functional peroxisomes in ZSS patients is widely accepted as the underlying cause of disease; however, our understanding of disease pathogenesis is still incomplete. Here, we demonstrate that PEX13 is required for selective autophagy of Sindbis virus (virophagy) and of damaged mitochondria (mitophagy) and that disease‐associated PEX13 mutants I326T and W313G are defective in mitophagy. The mitophagy function of PEX13 is shared with another peroxin family member PEX3, but not with two other peroxins, PEX14 and PEX19, which are required for general autophagy. Together, our results demonstrate that PEX13 is required for selective autophagy, and suggest that dysregulation of PEX13‐mediated mitophagy may contribute to ZSS pathogenesis.
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Affiliation(s)
- Ming Y Lee
- Center for Autophagy Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Rhea Sumpter
- Center for Autophagy Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Zhongju Zou
- Center for Autophagy Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Shyam Sirasanagandla
- Center for Autophagy Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Yongjie Wei
- Center for Autophagy Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Prashant Mishra
- Children's Medical Center Research Institute at the University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Hendrik Rosewich
- Department of Pediatrics and Pediatric Neurology, Georg August University, Göttingen, Germany
| | - Denis I Crane
- Eskitis Institute for Drug Discovery and School of Natural Sciences Griffith University, Nathan, Qld, Australia
| | - Beth Levine
- Center for Autophagy Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA .,Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
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35
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Rahim RS, Chen M, Nourse CC, Meedeniya ACB, Crane DI. Mitochondrial changes and oxidative stress in a mouse model of Zellweger syndrome neuropathogenesis. Neuroscience 2016; 334:201-213. [PMID: 27514574 DOI: 10.1016/j.neuroscience.2016.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 07/30/2016] [Accepted: 08/01/2016] [Indexed: 12/31/2022]
Abstract
Zellweger syndrome (ZS) is a peroxisome biogenesis disorder that involves significant neuropathology, the molecular basis of which is still poorly understood. Using a mouse model of ZS with brain-restricted deficiency of the peroxisome biogenesis protein PEX13, we demonstrated an expanded and morphologically modified brain mitochondrial population. Cultured fibroblasts from PEX13-deficient mouse embryo displayed similar changes, as well as increased levels of mitochondrial superoxide and membrane depolarization; this phenotype was rescued by antioxidant treatment. Significant oxidative damage to neurons in brain was indicated by products of lipid and DNA oxidation. Similar overall changes were observed for glial cells. In toto, these findings suggest that mitochondrial oxidative stress and aberrant mitochondrial dynamics are associated with the neuropathology arising from PEX13 deficiency.
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Affiliation(s)
- Rani Sadia Rahim
- Eskitis Institute for Drug Discovery, and School of Natural Sciences, Griffith University, Qld, Australia
| | - Mo Chen
- Eskitis Institute for Drug Discovery, and School of Natural Sciences, Griffith University, Qld, Australia
| | - C Cathrin Nourse
- Eskitis Institute for Drug Discovery, and School of Natural Sciences, Griffith University, Qld, Australia
| | - Adrian C B Meedeniya
- Griffith Health Institute, School of Medical Science, Griffith University, Qld, Australia
| | - Denis I Crane
- Eskitis Institute for Drug Discovery, and School of Natural Sciences, Griffith University, Qld, Australia.
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36
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Lassen KG, McKenzie CI, Mari M, Murano T, Begun J, Baxt LA, Goel G, Villablanca EJ, Kuo SY, Huang H, Macia L, Bhan AK, Batten M, Daly MJ, Reggiori F, Mackay CR, Xavier RJ. Genetic Coding Variant in GPR65 Alters Lysosomal pH and Links Lysosomal Dysfunction with Colitis Risk. Immunity 2016; 44:1392-405. [PMID: 27287411 DOI: 10.1016/j.immuni.2016.05.007] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 02/19/2016] [Accepted: 03/21/2016] [Indexed: 12/28/2022]
Abstract
Although numerous polymorphisms have been associated with inflammatory bowel disease (IBD), identifying the function of these genetic factors has proved challenging. Here we identified a role for nine genes in IBD susceptibility loci in antibacterial autophagy and characterized a role for one of these genes, GPR65, in maintaining lysosome function. Mice lacking Gpr65, a proton-sensing G protein-coupled receptor, showed increased susceptibly to bacteria-induced colitis. Epithelial cells and macrophages lacking GPR65 exhibited impaired clearance of intracellular bacteria and accumulation of aberrant lysosomes. Similarly, IBD patient cells and epithelial cells expressing an IBD-associated missense variant, GPR65 I231L, displayed aberrant lysosomal pH resulting in lysosomal dysfunction, impaired bacterial restriction, and altered lipid droplet formation. The GPR65 I231L polymorphism was sufficient to confer decreased GPR65 signaling. Collectively, these data establish a role for GPR65 in IBD susceptibility and identify lysosomal dysfunction as a potentially causative element in IBD pathogenesis with effects on cellular homeostasis and defense.
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Affiliation(s)
- Kara G Lassen
- The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA.
| | - Craig I McKenzie
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC 3800, Australia
| | - Muriel Mari
- Department of Cell Biology, University of Groningen, University Medical Center Groningen, 3713 AV Groningen, the Netherlands; Department of Cell Biology, University Medical Center Utrecht, 3564 CX Utrecht, the Netherlands
| | - Tatsuro Murano
- The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Jakob Begun
- Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA; Gastrointestinal Unit, Massachusetts General Hospital, Boston, MA 02114, USA; Mater Research Institute and School of Medicine, University of Queensland, Brisbane, QLD 4101, Australia
| | - Leigh A Baxt
- Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Gautam Goel
- Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Eduardo J Villablanca
- The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA; Gastrointestinal Unit, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Szu-Yu Kuo
- The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Hailiang Huang
- The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Analytic and Translational Genetics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Laurence Macia
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC 3800, Australia
| | - Atul K Bhan
- Pathology Department, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA; Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Marcel Batten
- Garvan Institute of Medical Research and St. Vincent's Clinical School, University of New South Wales, Sydney, NSW 2010, Australia
| | - Mark J Daly
- The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Analytic and Translational Genetics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA; Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Fulvio Reggiori
- Department of Cell Biology, University of Groningen, University Medical Center Groningen, 3713 AV Groningen, the Netherlands; Department of Cell Biology, University Medical Center Utrecht, 3564 CX Utrecht, the Netherlands
| | - Charles R Mackay
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC 3800, Australia
| | - Ramnik J Xavier
- The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA; Gastrointestinal Unit, Massachusetts General Hospital, Boston, MA 02114, USA; Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Boston, MA 02114, USA.
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37
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Bagheri H, Badduke C, Qiao Y, Colnaghi R, Abramowicz I, Alcantara D, Dunham C, Wen J, Wildin RS, Nowaczyk MJ, Eichmeyer J, Lehman A, Maranda B, Martell S, Shan X, Lewis SM, O’Driscoll M, Gregory-Evans CY, Rajcan-Separovic E. Identifying candidate genes for 2p15p16.1 microdeletion syndrome using clinical, genomic, and functional analysis. JCI Insight 2016; 1:e85461. [PMID: 27699255 PMCID: PMC5033885 DOI: 10.1172/jci.insight.85461] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 02/09/2016] [Indexed: 01/14/2023] Open
Abstract
The 2p15p16.1 microdeletion syndrome has a core phenotype consisting of intellectual disability, microcephaly, hypotonia, delayed growth, common craniofacial features, and digital anomalies. So far, more than 20 cases of 2p15p16.1 microdeletion syndrome have been reported in the literature; however, the size of the deletions and their breakpoints vary, making it difficult to identify the candidate genes. Recent reports pointed to 4 genes (XPO1, USP34, BCL11A, and REL) that were included, alone or in combination, in the smallest deletions causing the syndrome. Here, we describe 8 new patients with the 2p15p16.1 deletion and review all published cases to date. We demonstrate functional deficits for the above 4 candidate genes using patients' lymphoblast cell lines (LCLs) and knockdown of their orthologs in zebrafish. All genes were dosage sensitive on the basis of reduced protein expression in LCLs. In addition, deletion of XPO1, a nuclear exporter, cosegregated with nuclear accumulation of one of its cargo molecules (rpS5) in patients' LCLs. Other pathways associated with these genes (e.g., NF-κB and Wnt signaling as well as the DNA damage response) were not impaired in patients' LCLs. Knockdown of xpo1a, rel, bcl11aa, and bcl11ab resulted in abnormal zebrafish embryonic development including microcephaly, dysmorphic body, hindered growth, and small fins as well as structural brain abnormalities. Our multifaceted analysis strongly implicates XPO1, REL, and BCL11A as candidate genes for 2p15p16.1 microdeletion syndrome.
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Affiliation(s)
- Hani Bagheri
- Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
- Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Chansonette Badduke
- Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
- Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Ying Qiao
- Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
- Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Rita Colnaghi
- Human DNA Damage Response Disorders Group, Genome Damage and Stability Centre, University of Sussex, Brighton, United Kingdom
| | - Iga Abramowicz
- Human DNA Damage Response Disorders Group, Genome Damage and Stability Centre, University of Sussex, Brighton, United Kingdom
| | - Diana Alcantara
- Human DNA Damage Response Disorders Group, Genome Damage and Stability Centre, University of Sussex, Brighton, United Kingdom
| | - Christopher Dunham
- Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
| | - Jiadi Wen
- University of Texas at Dallas, Dallas, Texas, USA
| | | | - Malgorzata J.M. Nowaczyk
- Department of Pathology and Molecular Medicine, McMaster University Medical Centre, Hamilton, Ontario, Canada
| | | | - Anna Lehman
- Department of Medical Genetics, UBC, Vancouver, British Columbia, Canada
| | - Bruno Maranda
- Medical Genetics, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Sally Martell
- Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
- Child and Family Research Institute, Vancouver, British Columbia, Canada
| | - Xianghong Shan
- Department of Ophthalmology, UBC, Vancouver, British Columbia, Canada
| | - Suzanne M.E. Lewis
- Department of Medical Genetics, UBC, Vancouver, British Columbia, Canada
| | - Mark O’Driscoll
- Human DNA Damage Response Disorders Group, Genome Damage and Stability Centre, University of Sussex, Brighton, United Kingdom
| | | | - Evica Rajcan-Separovic
- Department of Pathology and Laboratory Medicine, University of British Columbia (UBC), Vancouver, British Columbia, Canada
- Child and Family Research Institute, Vancouver, British Columbia, Canada
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FUJIKI Y. Peroxisome biogenesis and human peroxisome-deficiency disorders. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2016; 92:463-477. [PMID: 27941306 PMCID: PMC5328784 DOI: 10.2183/pjab.92.463] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Peroxisome is a single-membrane-bounded ubiquitous organelle containing a hundred different enzymes that catalyze various metabolic pathways such as β-oxidation of very long-chain fatty acids and synthesis of plasmalogens. To investigate peroxisome biogenesis and human peroxisome biogenesis disorders (PBDs) including Zellweger syndrome, more than a dozen different complementation groups of Chinese hamster ovary (CHO) cell mutants impaired in peroxisome biogenesis are isolated as a model experimental system. By taking advantage of rapid functional complementation assay of the CHO cell mutants, successful cloning of PEX genes encoding peroxins required for peroxisome assembly invaluably contributed to the accomplishment of cloning of pathogenic genes responsible for PBDs. Peroxins are divided into three groups: 1) peroxins including Pex3p, Pex16p and Pex19p, are responsible for peroxisome membrane biogenesis via Pex19p- and Pex3p-dependent class I and Pex19p- and Pex16p-dependent class II pathways; 2) peroxins that function in matrix protein import; 3) those such as Pex11pβ are involved in peroxisome division where DLP1, Mff, and Fis1 coordinately function.
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Affiliation(s)
- Yukio FUJIKI
- Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
- Correspondence should be addressed: Y. Fujiki, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan (e-mail: )
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Berger J, Dorninger F, Forss-Petter S, Kunze M. Peroxisomes in brain development and function. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1863:934-55. [PMID: 26686055 PMCID: PMC4880039 DOI: 10.1016/j.bbamcr.2015.12.005] [Citation(s) in RCA: 117] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 12/04/2015] [Accepted: 12/09/2015] [Indexed: 12/26/2022]
Abstract
Peroxisomes contain numerous enzymatic activities that are important for mammalian physiology. Patients lacking either all peroxisomal functions or a single enzyme or transporter function typically develop severe neurological deficits, which originate from aberrant development of the brain, demyelination and loss of axonal integrity, neuroinflammation or other neurodegenerative processes. Whilst correlating peroxisomal properties with a compilation of pathologies observed in human patients and mouse models lacking all or individual peroxisomal functions, we discuss the importance of peroxisomal metabolites and tissue- and cell type-specific contributions to the observed brain pathologies. This enables us to deconstruct the local and systemic contribution of individual metabolic pathways to specific brain functions. We also review the recently discovered variability of pathological symptoms in cases with unexpectedly mild presentation of peroxisome biogenesis disorders. Finally, we explore the emerging evidence linking peroxisomes to more common neurological disorders such as Alzheimer’s disease, autism and amyotrophic lateral sclerosis. This article is part of a Special Issue entitled: Peroxisomes edited by Ralf Erdmann.
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Affiliation(s)
- Johannes Berger
- Department of Pathobiology of the Nervous System, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, 1090 Vienna, Austria.
| | - Fabian Dorninger
- Department of Pathobiology of the Nervous System, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, 1090 Vienna, Austria.
| | - Sonja Forss-Petter
- Department of Pathobiology of the Nervous System, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, 1090 Vienna, Austria.
| | - Markus Kunze
- Department of Pathobiology of the Nervous System, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, 1090 Vienna, Austria.
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Qian G, Fan W, Ahlemeyer B, Karnati S, Baumgart-Vogt E. Peroxisomes in Different Skeletal Cell Types during Intramembranous and Endochondral Ossification and Their Regulation during Osteoblast Differentiation by Distinct Peroxisome Proliferator-Activated Receptors. PLoS One 2015; 10:e0143439. [PMID: 26630504 PMCID: PMC4668026 DOI: 10.1371/journal.pone.0143439] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 11/04/2015] [Indexed: 01/10/2023] Open
Abstract
Ossification defects leading to craniofacial dysmorphism or rhizomelia are typical phenotypes in patients and corresponding knockout mouse models with distinct peroxisomal disorders. Despite these obvious skeletal pathologies, to date no careful analysis exists on the distribution and function of peroxisomes in skeletal tissues and their alterations during ossification. Therefore, we analyzed the peroxisomal compartment in different cell types of mouse cartilage and bone as well as in primary cultures of calvarial osteoblasts. The peroxisome number and metabolism strongly increased in chondrocytes during endochondral ossification from the reserve to the hypertrophic zone, whereas in bone, metabolically active osteoblasts contained a higher numerical abundance of this organelle than osteocytes. The high abundance of peroxisomes in these skeletal cell types is reflected by high levels of Pex11β gene expression. During culture, calvarial pre-osteoblasts differentiated into secretory osteoblasts accompanied by peroxisome proliferation and increased levels of peroxisomal genes and proteins. Since many peroxisomal genes contain a PPAR-responsive element, we analyzed the gene expression of PPARɑ/ß/ɣ in calvarial osteoblasts and MC3T3-E1 cells, revealing higher levels for PPARß than for PPARɑ and PPARɣ. Treatment with different PPAR agonists and antagonists not only changed the peroxisomal compartment and associated gene expression, but also induced complex alterations of the gene expression patterns of the other PPAR family members. Studies in M3CT3-E1 cells showed that the PPARß agonist GW0742 activated the PPRE-mediated luciferase expression and up-regulated peroxisomal gene transcription (Pex11, Pex13, Pex14, Acox1 and Cat), whereas the PPARß antagonist GSK0660 led to repression of the PPRE and a decrease of the corresponding mRNA levels. In the same way, treatment of calvarial osteoblasts with GW0742 increased in peroxisome number and related gene expression and accelerated osteoblast differentiation. Taken together, our results suggest that PPARß regulates the numerical abundance and metabolic function of peroxisomes via Pex11ß in parallel to osteoblast differentiation.
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Affiliation(s)
- Guofeng Qian
- Institute for Anatomy and Cell Biology, Medical Cell Biology, Justus-Liebig-University, Aulweg 123, 35385 Giessen, Germany
| | - Wei Fan
- Institute for Anatomy and Cell Biology, Medical Cell Biology, Justus-Liebig-University, Aulweg 123, 35385 Giessen, Germany
| | - Barbara Ahlemeyer
- Institute for Anatomy and Cell Biology, Medical Cell Biology, Justus-Liebig-University, Aulweg 123, 35385 Giessen, Germany
| | - Srikanth Karnati
- Institute for Anatomy and Cell Biology, Medical Cell Biology, Justus-Liebig-University, Aulweg 123, 35385 Giessen, Germany
| | - Eveline Baumgart-Vogt
- Institute for Anatomy and Cell Biology, Medical Cell Biology, Justus-Liebig-University, Aulweg 123, 35385 Giessen, Germany
- * E-mail:
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Baes M, Van Veldhoven PP. Hepatic dysfunction in peroxisomal disorders. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 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] [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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Lismont C, Nordgren M, Van Veldhoven PP, Fransen M. Redox interplay between mitochondria and peroxisomes. Front Cell Dev Biol 2015; 3:35. [PMID: 26075204 PMCID: PMC4444963 DOI: 10.3389/fcell.2015.00035] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 05/09/2015] [Indexed: 12/14/2022] Open
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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Mitochondria in peroxisome-deficient hepatocytes exhibit impaired respiration, depleted DNA, and PGC-1α independent proliferation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1853:285-98. [PMID: 25450972 DOI: 10.1016/j.bbamcr.2014.11.017] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 11/04/2014] [Accepted: 11/13/2014] [Indexed: 02/01/2023]
Abstract
The tight interrelationship between peroxisomes and mitochondria is illustrated by their cooperation in lipid metabolism, antiviral innate immunity and shared use of proteins executing organellar fission. In addition, we previously reported that disruption of peroxisome biogenesis in hepatocytes severely impacts on mitochondrial integrity, primarily damaging the inner membrane. Here we investigated the molecular impairments of the dysfunctional mitochondria in hepatocyte selective Pex5 knockout mice. First, by using blue native electrophoresis and in-gel activity stainings we showed that the respiratory complexes were differentially affected with reduction of complexes I and III and incomplete assembly of complex V, whereas complexes II and IV were normally active. This resulted in impaired oxygen consumption in cultured Pex5(-/-) hepatocytes. Second, mitochondrial DNA was depleted causing an imbalance in the expression of mitochondrial- and nuclear-encoded subunits of the respiratory chain complexes. Third, mitochondrial membranes showed increased permeability and fluidity despite reduced content of the polyunsaturated fatty acid docosahexaenoic acid. Fourth, the affected mitochondria in peroxisome deficient hepatocytes displayed increased oxidative stress. Acute deletion of PEX5 in vivo using adeno-Cre virus phenocopied these effects, indicating that mitochondrial perturbations closely follow the loss of functional peroxisomes in time. Likely to compensate for the functional impairments, the volume of the mitochondrial compartment was increased several folds. This was not driven by PGC-1α but mediated by activation of PPARα, possibly through c-myc overexpression. In conclusion, loss of peroxisomal metabolism in hepatocytes perturbs the mitochondrial inner membrane, depletes mitochondrial DNA and causes mitochondrial biogenesis independent of PGC-1α.
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Faust JE, Manisundaram A, Ivanova PT, Milne SB, Summerville JB, Brown HA, Wangler M, Stern M, McNew JA. Peroxisomes are required for lipid metabolism and muscle function in Drosophila melanogaster. PLoS One 2014; 9:e100213. [PMID: 24945818 PMCID: PMC4063865 DOI: 10.1371/journal.pone.0100213] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 05/22/2014] [Indexed: 01/19/2023] Open
Abstract
Peroxisomes are ubiquitous organelles that perform lipid and reactive oxygen species metabolism. Defects in peroxisome biogenesis cause peroxisome biogenesis disorders (PBDs). The most severe PBD, Zellweger syndrome, is characterized in part by neuronal dysfunction, craniofacial malformations, and low muscle tone (hypotonia). These devastating diseases lack effective therapies and the development of animal models may reveal new drug targets. We have generated Drosophila mutants with impaired peroxisome biogenesis by disrupting the early peroxin gene pex3, which participates in budding of pre-peroxisomes from the ER and peroxisomal membrane protein localization. pex3 deletion mutants lack detectible peroxisomes and die before or during pupariation. At earlier stages of development, larvae lacking Pex3 display reduced size and impaired lipid metabolism. Selective loss of peroxisomes in muscles impairs muscle function and results in flightless animals. Although, hypotonia in PBD patients is thought to be a secondary effect of neuronal dysfunction, our results suggest that peroxisome loss directly affects muscle physiology, possibly by disrupting energy metabolism. Understanding the role of peroxisomes in Drosophila physiology, specifically in muscle cells may reveal novel aspects of PBD etiology.
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Affiliation(s)
- Joseph E. Faust
- Department of Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - Arvind Manisundaram
- Department of Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - Pavlina T. Ivanova
- Department of Pharmacology and the Vanderbilt Institute of Chemical Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Stephen B. Milne
- Department of Pharmacology and the Vanderbilt Institute of Chemical Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - James B. Summerville
- Department of Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - H. Alex Brown
- Department of Pharmacology and the Vanderbilt Institute of Chemical Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Michael Wangler
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Michael Stern
- Department of Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
| | - James A. McNew
- Department of Biochemistry and Cell Biology, Rice University, Houston, Texas, United States of America
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45
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Central serotonergic neuron deficiency in a mouse model of Zellweger syndrome. Neuroscience 2014; 274:229-41. [PMID: 24881576 DOI: 10.1016/j.neuroscience.2014.05.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 05/16/2014] [Accepted: 05/16/2014] [Indexed: 11/21/2022]
Abstract
Zellweger syndrome (ZS) is a severe peroxisomal disorder caused by mutations in peroxisome biogenesis, or PEX, genes. A central hallmark of ZS is abnormal neuronal migration and neurodegeneration, which manifests as widespread neurological dysfunction. The molecular basis of ZS neuropathology is not well understood. Here we present findings using a mouse model of ZS neuropathology with conditional brain inactivation of the PEX13 gene. We demonstrate that PEX13 brain mutants display changes that reflect an abnormal serotonergic system - decreased levels of tryptophan hydroxylase-2, the rate-limiting enzyme of serotonin (5-hydroxytryptamine, 5-HT) synthesis, dysmorphic 5-HT-positive neurons, abnormal distribution of 5-HT neurons, and dystrophic serotonergic axons. The raphe nuclei region of PEX13 brain mutants also display increased levels of apoptotic cells and reactive, inflammatory gliosis. Given the role of the serotonergic system in brain development and motor control, dysfunction of this system would account in part for the observed neurological changes of PEX13 brain mutants.
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Hiebler S, Masuda T, Hacia JG, Moser AB, Faust PL, Liu A, Chowdhury N, Huang N, Lauer A, Bennett J, Watkins PA, Zack DJ, Braverman NE, Raymond GV, Steinberg SJ. The Pex1-G844D mouse: a model for mild human Zellweger spectrum disorder. Mol Genet Metab 2014; 111:522-532. [PMID: 24503136 PMCID: PMC4901203 DOI: 10.1016/j.ymgme.2014.01.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 01/14/2014] [Accepted: 01/14/2014] [Indexed: 12/21/2022]
Abstract
Zellweger spectrum disorder (ZSD) is a disease continuum that results from inherited defects in PEX genes essential for normal peroxisome assembly. These autosomal recessive disorders impact brain development and also cause postnatal liver, adrenal, and kidney dysfunction, as well as loss of vision and hearing. The hypomorphic PEX1-G843D missense allele, observed in approximately 30% of ZSD patients, is associated with milder clinical and biochemical phenotypes, with some homozygous individuals surviving into early adulthood. Nonetheless, affected children with the PEX1-G843D allele have intellectual disability, failure to thrive, and significant sensory deficits. To enhance our ability to test candidate therapies that improve human PEX1-G843D function, we created the novel Pex1-G844D knock-in mouse model that represents the murine equivalent of the common human mutation. We show that Pex1-G844D homozygous mice recapitulate many classic features of mild ZSD cases, including growth retardation and fatty livers with cholestasis. In addition, electrophysiology, histology, and gene expression studies provide evidence that these animals develop a retinopathy similar to that observed in human patients, with evidence of cone photoreceptor cell death. Similar to skin fibroblasts obtained from ZSD patients with a PEX1-G843D allele, we demonstrate that murine cells homozygous for the Pex1-G844D allele respond to chaperone-like compounds, which normalizes peroxisomal β-oxidation. Thus, the Pex1-G844D mouse provides a powerful model system for testing candidate therapies that address the most common genetic cause of ZSD. In addition, this murine model will enhance studies focused on mechanisms of pathogenesis.
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Affiliation(s)
- Shandi Hiebler
- Department of Neurogenetics, Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, USA
| | - Tomohiro Masuda
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Joseph G Hacia
- Department of Biochemistry and Molecular Biology, Institute for Genetic Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Ann B Moser
- Department of Neurogenetics, Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Phyllis L Faust
- Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Anita Liu
- Department of Neurogenetics, Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, USA
| | - Nivedita Chowdhury
- Department of Neurogenetics, Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, USA
| | - Ning Huang
- Department of Biochemistry and Molecular Biology, Institute for Genetic Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Amanda Lauer
- Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jean Bennett
- F.M. Kirby Center for Molecular Ophthalmology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Paul A Watkins
- Department of Neurogenetics, Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Donald J Zack
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Departments of Molecular Biology and Genetics, and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Institut de la Vision, Université Pierre et Marie Curie, Paris, France
| | - Nancy E Braverman
- Department of Genetics, McGill University, Montreal, Quebec, Canada
- Department of Pediatrics, Montreal Children's Hospital, Montreal, Quebec, Canada
| | - Gerald V Raymond
- Department of Neurogenetics, Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Steven J Steinberg
- Department of Neurogenetics, Hugo W. Moser Research Institute at Kennedy Krieger, 707 N. Broadway, Baltimore, MD, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Revisiting the neuropathogenesis of Zellweger syndrome. Neurochem Int 2014; 69:1-8. [DOI: 10.1016/j.neuint.2014.02.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 02/11/2014] [Accepted: 02/24/2014] [Indexed: 01/27/2023]
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48
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Van Veldhoven PP, Baes M. Peroxisome deficient invertebrate and vertebrate animal models. Front Physiol 2013; 4:335. [PMID: 24319432 PMCID: PMC3837297 DOI: 10.3389/fphys.2013.00335] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Accepted: 11/01/2013] [Indexed: 11/29/2022] Open
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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The biogenesis protein PEX14 is an optimal marker for the identification and localization of peroxisomes in different cell types, tissues, and species in morphological studies. Histochem Cell Biol 2013; 140:423-42. [DOI: 10.1007/s00418-013-1133-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/29/2013] [Indexed: 01/09/2023]
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