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Cañadas-Garre M, Baños-Jaime B, Maqueda JJ, Smyth LJ, Cappa R, Skelly R, Hill C, Brennan EP, Doyle R, Godson C, Maxwell AP, McKnight AJ. Genetic variants affecting mitochondrial function provide further insights for kidney disease. BMC Genomics 2024; 25:576. [PMID: 38858654 PMCID: PMC11163707 DOI: 10.1186/s12864-024-10449-1] [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: 07/28/2023] [Accepted: 05/24/2024] [Indexed: 06/12/2024] Open
Abstract
BACKGROUND Chronic kidney disease (CKD) is a complex disorder that has become a high prevalence global health problem, with diabetes being its predominant pathophysiologic driver. Autosomal genetic variation only explains some of the predisposition to kidney disease. Variations in the mitochondrial genome (mtDNA) and nuclear-encoded mitochondrial genes (NEMG) are implicated in susceptibility to kidney disease and CKD progression, but they have not been thoroughly explored. Our aim was to investigate the association of variation in both mtDNA and NEMG with CKD (and related traits), with a particular focus on diabetes. METHODS We used the UK Biobank (UKB) and UK-ROI, an independent collection of individuals with type 1 diabetes mellitus (T1DM) patients. RESULTS Fourteen mitochondrial variants were associated with estimated glomerular filtration rate (eGFR) in UKB. Mitochondrial variants and haplogroups U, H and J were associated with eGFR and serum variables. Mitochondrial haplogroup H was associated with all the serum variables regardless of the presence of diabetes. Mitochondrial haplogroup X was associated with end-stage kidney disease (ESKD) in UKB. We confirmed the influence of several known NEMG on kidney disease and function and found novel associations for SLC39A13, CFL1, ACP2 or ATP5G1 with serum variables and kidney damage, and for SLC4A1, NUP210 and MYH14 with ESKD. The G allele of TBC1D32-rs113987180 was associated with higher risk of ESKD in patients with diabetes (OR:9.879; CI95%:4.440-21.980; P = 2.0E-08). In UK-ROI, AGXT2-rs71615838 and SURF1-rs183853102 were associated with diabetic nephropathies, and TFB1M-rs869120 with eGFR. CONCLUSIONS We identified novel variants both in mtDNA and NEMG which may explain some of the missing heritability for CKD and kidney phenotypes. We confirmed the role of MT-ND5 and mitochondrial haplogroup H on renal disease (serum variables), and identified the MT-ND5-rs41535848G variant, along with mitochondrial haplogroup X, associated with higher risk of ESKD. Despite most of the associations were independent of diabetes, we also showed potential roles for NEMG in T1DM.
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Affiliation(s)
- Marisa Cañadas-Garre
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK.
- Genomic Oncology Area, Centre for Genomics and Oncological Research: Pfizer, GENYO, University of Granada-Andalusian Regional Government, PTS Granada. Avenida de La Ilustración 114, 18016, Granada, Spain.
- Hematology Department, Hospital Universitario Virgen de Las Nieves, Avenida de Las Fuerzas Armadas 2, 18014, Granada, Spain.
- Instituto de Investigación Biosanitaria de Granada (Ibs.GRANADA), Avda. de Madrid, 15, 18012, Granada, Spain.
| | - Blanca Baños-Jaime
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
- Instituto de Investigaciones Químicas (IIQ), Centro de Investigaciones Científicas Isla de La Cartuja (cicCartuja), Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, Avda. Américo Vespucio 49, 41092, Seville, Spain
| | - Joaquín J Maqueda
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
- Experimental Oncology Laboratory, IRCCS Rizzoli Orthopaedic Institute, 40136, Bologna, Italy
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), University of Bologna, 40126, Bologna, Italy
| | - Laura J Smyth
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
| | - Ruaidhri Cappa
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
| | - Ryan Skelly
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
| | - Claire Hill
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
| | - Eoin P Brennan
- UCD Diabetes Complications Research Centre, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, D04 V1W8, Ireland
- School of Medicine, University College Dublin, Dublin, D04 V1W8, Ireland
| | - Ross Doyle
- UCD Diabetes Complications Research Centre, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, D04 V1W8, Ireland
- School of Medicine, University College Dublin, Dublin, D04 V1W8, Ireland
- Mater Misericordiae University Hospital, Eccles St, Dublin, D07 R2WY, Ireland
| | - Catherine Godson
- UCD Diabetes Complications Research Centre, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, D04 V1W8, Ireland
- School of Medicine, University College Dublin, Dublin, D04 V1W8, Ireland
| | - Alexander P Maxwell
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
- Regional Nephrology Unit, Belfast City Hospital, Level 11Lisburn Road, Belfast, BT9 7AB, UK
| | - Amy Jayne McKnight
- Molecular Epidemiology and Public Health Research Group, Centre for Public Health,, Queen's University Belfast, Institute for Clinical Sciences A, Royal Victoria Hospital, Belfast, BT12 6BA, UK
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Vincent AE, Chen C, Gomes TB, Di Leo V, Laalo T, Pabis K, Capaldi R, Marusich MF, McDonald D, Filby A, Fuller A, Lehmann Urban D, Zierz S, Deschauer M, Turnbull D, Reeve AK, Lawless C. A stagewise response to mitochondrial dysfunction in mitochondrial DNA maintenance disorders. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167131. [PMID: 38521420 DOI: 10.1016/j.bbadis.2024.167131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 03/13/2024] [Accepted: 03/15/2024] [Indexed: 03/25/2024]
Abstract
Mitochondrial DNA (mtDNA) deletions which clonally expand in skeletal muscle of patients with mtDNA maintenance disorders, impair mitochondrial oxidative phosphorylation dysfunction. Previously we have shown that these mtDNA deletions arise and accumulate in perinuclear mitochondria causing localised mitochondrial dysfunction before spreading through the muscle fibre. We believe that mito-nuclear signalling is a key contributor in the accumulation and spread of mtDNA deletions, and that knowledge of how muscle fibres respond to mitochondrial dysfunction is key to our understanding of disease mechanisms. To understand the contribution of mito-nuclear signalling to the spread of mitochondrial dysfunction, we use imaging mass cytometry. We characterise the levels of mitochondrial Oxidative Phosphorylation proteins alongside a mitochondrial mass marker, in a cohort of patients with mtDNA maintenance disorders. Our expanded panel included protein markers of key signalling pathways, allowing us to investigate cellular responses to different combinations of oxidative phosphorylation dysfunction and ragged red fibres. We find combined Complex I and IV deficiency to be most common. Interestingly, in fibres deficient for one or more complexes, the remaining complexes are often upregulated beyond the increase of mitochondrial mass typically observed in ragged red fibres. We further find that oxidative phosphorylation deficient fibres exhibit an increase in the abundance of proteins involved in proteostasis, e.g. HSP60 and LONP1, and regulation of mitochondrial metabolism (including oxidative phosphorylation and proteolysis, e.g. PHB1). Our analysis suggests that the cellular response to mitochondrial dysfunction changes depending on the combination of deficient oxidative phosphorylation complexes in each fibre.
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Affiliation(s)
- Amy E Vincent
- Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK; NIHR Biomedical Research Centre, Faculty of Medical Sciences, Newcastle University, Newcastle, UK; John Walton Muscular Dystrophy Research Centre, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK.
| | - Chun Chen
- Wellcome Centre for Mitochondrial Research, Bioscience Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Tiago Bernardino Gomes
- Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK; NIHR Biomedical Research Centre, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Valeria Di Leo
- Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Tuomas Laalo
- Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Kamil Pabis
- Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | | | | | - David McDonald
- Innovation, Methodology and Application Research Theme, Biosciences Institute, Newcastle University, Newcastle upon Tyne, UK; Flow Cytometry Core Facility, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Andrew Filby
- Innovation, Methodology and Application Research Theme, Biosciences Institute, Newcastle University, Newcastle upon Tyne, UK; Flow Cytometry Core Facility, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Andrew Fuller
- Innovation, Methodology and Application Research Theme, Biosciences Institute, Newcastle University, Newcastle upon Tyne, UK; Flow Cytometry Core Facility, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | | | - Stephan Zierz
- Department of Neurology, Martin-Luther-University Halle-Wittenberg, Halle/Saale, Germany
| | - Marcus Deschauer
- Department of Neurology, Technical University Munich, Munich, Germany
| | - Doug Turnbull
- Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Amy K Reeve
- Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
| | - Conor Lawless
- Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK; NIHR Biomedical Research Centre, Faculty of Medical Sciences, Newcastle University, Newcastle, UK
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3
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Todosenko N, Yurova K, Vulf M, Khaziakhmatova O, Litvinova L. Prohibitions in the meta-inflammatory response: a review. Front Mol Biosci 2024; 11:1322687. [PMID: 38813101 PMCID: PMC11133639 DOI: 10.3389/fmolb.2024.1322687] [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: 10/16/2023] [Accepted: 05/01/2024] [Indexed: 05/31/2024] Open
Abstract
Prohibitins are the central regulatory element of cellular homeostasis, especially by modulating the response at different levels: Nucleus, mitochondria and membranes. Their localization and interaction with various proteins, homons, transcription and nuclear factors, and mtDNA indicate the globality and complexity of their pleiotropic properties, which remain to be investigated. A more detailed deciphering of cellular metabolism in relation to prohibitins under normal conditions and in various metabolic diseases will allow us to understand the precise role of prohibitins in the signaling cascades of PI3K/Akt, Raf/MAP/ERK, STAT3, p53, and others and to fathom their mutual influence. A valuable research perspective is to investigate the role of prohibitins in the molecular and cellular interactions between the two major players in the pathogenesis of obesity-adipocytes and macrophages - that form the basis of the meta-inflammatory response. Investigating the subtle intercellular communication and molecular cascades triggered in these cells will allow us to propose new therapeutic strategies to eliminate persistent inflammation, taking into account novel molecular genetic approaches to activate/inactivate prohibitins.
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Affiliation(s)
- Natalia Todosenko
- Center for Immunology and Cellular Biotechnology, Immanuel Kant Baltic Federal University, Kaliningrad, Russia
| | - Kristina Yurova
- Center for Immunology and Cellular Biotechnology, Immanuel Kant Baltic Federal University, Kaliningrad, Russia
| | - Maria Vulf
- Center for Immunology and Cellular Biotechnology, Immanuel Kant Baltic Federal University, Kaliningrad, Russia
| | - Olga Khaziakhmatova
- Center for Immunology and Cellular Biotechnology, Immanuel Kant Baltic Federal University, Kaliningrad, Russia
| | - Larisa Litvinova
- Center for Immunology and Cellular Biotechnology, Immanuel Kant Baltic Federal University, Kaliningrad, Russia
- Laboratory of Cellular and Microfluidic Technologies, Siberian State Medical University, Tomsk, Russia
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Mandatori S, Liu Y, Marturia-Navarro J, Hadi M, Henriksen K, Zheng J, Rasmussen LM, Rizza S, Kaestner KH, Issazadeh-Navikas S. PRKAG2.2 is essential for FoxA1 + regulatory T cell differentiation and metabolic rewiring distinct from FoxP3 + regulatory T cells. SCIENCE ADVANCES 2023; 9:eadj8442. [PMID: 38117896 PMCID: PMC10732530 DOI: 10.1126/sciadv.adj8442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 11/20/2023] [Indexed: 12/22/2023]
Abstract
Forkhead box A1 (FoxA1)+ regulatory T cells (Tregs) exhibit distinct characteristics from FoxP3+ Tregs while equally effective in exerting anti-inflammatory properties. The role of FoxP3+ Tregs in vivo has been challenged, motivating a better understanding of other Tregs in modulating hyperactive immune responses. FoxA1+ Tregs are generated on activation of the transcription factor FoxA1 by interferon-β (IFNβ), an anti-inflammatory cytokine. T cell activation, expansion, and function hinge on metabolic adaptability. We demonstrated that IFNβ promotes a metabolic rearrangement of FoxA1+ Tregs by enhancing oxidative phosphorylation and mitochondria clearance by mitophagy. In response to IFNβ, FoxA1 induces a specific transcription variant of adenosine 5'-monophosphate-activated protein kinase (AMPK) γ2 subunit, PRKAG2.2. This leads to the activation of AMPK signaling, thereby enhancing mitochondrial respiration and mitophagy by ULK1-BNIP3. This IFNβ-FoxA1-PRKAG2.2-BNIP3 axis is pivotal for their suppressive function. The involvement of PRKAG2.2 in FoxA1+ Treg, not FoxP3+ Treg differentiation, underscores the metabolic differences between Treg populations and suggests potential therapeutic targets for autoimmune diseases.
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Affiliation(s)
- Sara Mandatori
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Yawei Liu
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Joana Marturia-Navarro
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Mahdieh Hadi
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Kristine Henriksen
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jin Zheng
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Louise Munk Rasmussen
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Salvatore Rizza
- Redox Biology Group, Danish Cancer Society Research Center, Copenhagen, Denmark
| | - Klaus H. Kaestner
- Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - Shohreh Issazadeh-Navikas
- Neuroinflammation Unit, Biotech Research and Innovation Centre, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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5
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Duque JE, Urbina DL, Vesga LC, Ortiz-Rodríguez LA, Vanegas TS, Stashenko EE, Mendez-Sanchez SC. Insecticidal activity of essential oils from American native plants against Aedes aegypti (Diptera: Culicidae): an introduction to their possible mechanism of action. Sci Rep 2023; 13:2989. [PMID: 36805522 PMCID: PMC9941582 DOI: 10.1038/s41598-023-30046-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 02/15/2023] [Indexed: 02/22/2023] Open
Abstract
Searching for new bioactive molecules to design insecticides is a complex process since pesticides should be highly selective, active against the vector, and bio-safe for humans. Aiming to find natural compounds for mosquito control, we evaluated the insecticidal activity of essential oils (EOs) from 20 American native plants against Aedes aegypti larvae using bioassay, biochemical, and in silico analyses. The highest larvicide activity was exhibited by EOs from Steiractinia aspera (LC50 = 42.4 µg/mL), Turnera diffusa (LC50 = 70.9 µg/mL), Piper aduncum (LC50 = 55.8 µg/mL), Lippia origanoides (chemotype thymol/carvacrol) (LC50 = 61.9 µg/mL), L. origanoides (chemotype carvacrol/thymol) (LC50 = 59.8 µg/mL), Hyptis dilatata (LC50 = 61.1 µg/mL), Elaphandra quinquenervis (LC50 = 61.1 µg/mL), and Calycolpus moritzianus (LC50 = 73.29 µg/mL) after 24 h. This biological activity may be related to the disruption of the electron transport chain through the mitochondrial protein complexes. We hypothesized that the observed EOs' effect is due to their major components, where computational approaches such as homology modeling and molecular docking may suggest the possible binding pose of secondary metabolites that inhibit the mitochondrial enzymes and acetylcholinesterase activity (AChE). Our results provided insights into the possible mechanism of action of EOs and their major compounds for new insecticide designs targeting the mitochondria and AChE activity in A. aegypti for effective and safe insecticide.
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Affiliation(s)
- Jonny E. Duque
- grid.411595.d0000 0001 2105 7207Centro de Investigaciones en Enfermedades Tropicales – Cintrop, Departamento de Ciencias Básicas, Escuela de Medicina, Universidad Industrial de Santander, Parque Tecnológico y de Investigaciones Guatiguará Km 2 El Refugio, Piedecuesta, Colombia
| | - Diana L. Urbina
- grid.411595.d0000 0001 2105 7207Grupo de Investigación en Bioquímica y Microbiología (GIBIM), Escuela de Química, Universidad Industrial de Santander, Bucaramanga, Colombia
| | - Luis C. Vesga
- grid.411595.d0000 0001 2105 7207Grupo de Investigación en Bioquímica y Microbiología (GIBIM), Escuela de Química, Universidad Industrial de Santander, Bucaramanga, Colombia
| | - Luis A. Ortiz-Rodríguez
- grid.411595.d0000 0001 2105 7207Centro de Investigaciones en Enfermedades Tropicales – Cintrop, Departamento de Ciencias Básicas, Escuela de Medicina, Universidad Industrial de Santander, Parque Tecnológico y de Investigaciones Guatiguará Km 2 El Refugio, Piedecuesta, Colombia
| | - Thomas S. Vanegas
- grid.411595.d0000 0001 2105 7207Centro de Investigaciones en Enfermedades Tropicales – Cintrop, Departamento de Ciencias Básicas, Escuela de Medicina, Universidad Industrial de Santander, Parque Tecnológico y de Investigaciones Guatiguará Km 2 El Refugio, Piedecuesta, Colombia
| | - Elena E. Stashenko
- grid.411595.d0000 0001 2105 7207Centro de Investigación en Biomoléculas – CIBIMOL y Centro Nacional de Investigación para la Agroindustrialización de Plantas Aromáticas y Medicinales Tropicales – CENIVAM, Universidad Industrial de Santander, Bucaramanga, Colombia
| | - Stelia C. Mendez-Sanchez
- grid.411595.d0000 0001 2105 7207Grupo de Investigación en Bioquímica y Microbiología (GIBIM), Escuela de Química, Universidad Industrial de Santander, Bucaramanga, Colombia
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Effects of Resveratrol on Muscle Inflammation, Energy Utilisation, and Exercise Performance in an Eccentric Contraction Exercise Mouse Model. Nutrients 2023; 15:nu15010249. [PMID: 36615906 PMCID: PMC9824440 DOI: 10.3390/nu15010249] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 12/29/2022] [Accepted: 12/30/2022] [Indexed: 01/06/2023] Open
Abstract
Eccentric contraction can easily cause muscle damage and an inflammatory response, which reduces the efficiency of muscle contraction. Resveratrol causes anti-inflammatory effects in muscles, accelerates muscle repair, and promotes exercise performance after contusion recovery. However, whether resveratrol provides the same benefits for sports injuries caused by eccentric contraction is unknown. Thus, we explored the effects of resveratrol on inflammation and energy metabolism. In this study, mice were divided into four groups: a control group, an exercise group (EX), an exercise with low-dose resveratrol group (EX + RES25), and an exercise with high-dose resveratrol group (EX + RES150). The results of an exhaustion test showed that the time before exhaustion of the EX + RES150 group was greater than that of the EX group. Tumour necrosis factor-α (Tnfα) mRNA expression was lower in the EX + RES150 group than in the EX group. The energy utilisation of the EX + RES150 group was greater than that of the EX + RES25 group in different muscles. High-dose resveratrol intervention decreased Tnfα mRNA expression and enhanced the mRNA expressions of sirtuin 1, glucose transporter 4, AMP-activated protein kinase α1, and AMP-activated protein kinase α2 in muscles. These results revealed that high-dose resveratrol supplementation can reduce inflammation and oxidation and improve energy utilisation during short-duration high-intensity exercise.
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Inner mitochondrial membrane protein Prohibitin 1 mediates Nix-induced, Parkin-independent mitophagy. Sci Rep 2023; 13:18. [PMID: 36593241 PMCID: PMC9807637 DOI: 10.1038/s41598-022-26775-x] [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: 09/04/2022] [Accepted: 12/20/2022] [Indexed: 01/04/2023] Open
Abstract
Autophagy of damaged mitochondria, called mitophagy, is an important organelle quality control process involved in the pathogenesis of inflammation, cancer, aging, and age-associated diseases. Many of these disorders are associated with altered expression of the inner mitochondrial membrane (IMM) protein Prohibitin 1. The mechanisms whereby dysfunction occurring internally at the IMM and matrix activate events at the outer mitochondrial membrane (OMM) to induce mitophagy are not fully elucidated. Using the gastrointestinal epithelium as a model system highly susceptible to autophagy inhibition, we reveal a specific role of Prohibitin-induced mitophagy in maintaining intestinal homeostasis. We demonstrate that Prohibitin 1 induces mitophagy in response to increased mitochondrial reactive oxygen species (ROS) through binding to mitophagy receptor Nix/Bnip3L and independently of Parkin. Prohibitin 1 is required for ROS-induced Nix localization to mitochondria and maintaining homeostasis of epithelial cells highly susceptible to mitochondrial dysfunction.
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Liu H, Fan H, He P, Zhuang H, Liu X, Chen M, Zhong W, Zhang Y, Zhen C, Li Y, Jiang H, Meng T, Xu Y, Zhao G, Feng D. Prohibitin 1 regulates mtDNA release and downstream inflammatory responses. EMBO J 2022; 41:e111173. [PMID: 36245295 PMCID: PMC9753472 DOI: 10.15252/embj.2022111173] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 09/11/2022] [Accepted: 09/14/2022] [Indexed: 01/15/2023] Open
Abstract
Exposure of mitochondrial DNA (mtDNA) to the cytosol activates innate immune responses. But the mechanisms by which mtDNA crosses the inner mitochondrial membrane are unknown. Here, we found that the inner mitochondrial membrane protein prohibitin 1 (PHB1) plays a critical role in mtDNA release by regulating permeability across the mitochondrial inner membrane. Loss of PHB1 results in alterations in mitochondrial integrity and function. PHB1-deficient macrophages, serum from myeloid-specific PHB1 KO (Phb1MyeKO) mice, and peripheral blood mononuclear cells from neonatal sepsis patients show increased interleukin-1β (IL-1β) levels. PHB1 KO mice are also intolerant of lipopolysaccharide shock. Phb1-depleted macrophages show increased cytoplasmic release of mtDNA and inflammatory responses. This process is suppressed by cyclosporine A and VBIT-4, which inhibit the mitochondrial permeability transition pore (mPTP) and VDAC oligomerization. Inflammatory stresses downregulate PHB1 expression levels in macrophages. Under normal physiological conditions, the inner mitochondrial membrane proteins, AFG3L2 and SPG7, are tethered to PHB1 to inhibit mPTP opening. Downregulation of PHB1 results in enhanced interaction between AFG3L2 and SPG7, mPTP opening, mtDNA release, and downstream inflammatory responses.
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Affiliation(s)
- Hao Liu
- Qingyuan People's HospitalThe Sixth Affiliated Hospital of Guangzhou Medical UniversityQingyuanChina
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
- State Key Laboratory of Respiratory DiseaseGuangzhou Medical UniversityGuangzhouChina
| | - Hualin Fan
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
- Department of Cardiology, School of MedicineSouth China University of TechnologyGuangzhouChina
| | - Pengcheng He
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
- Guangdong Provincial Key Laboratory of Coronary Heart Disease Prevention, Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
- Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of MedicineSouth China University of TechnologyGuangzhouChina
- Department of CardiologyHeyuan People's HospitalHeyuanChina
| | - Haixia Zhuang
- Department of AnesthesiologySecond Clinical College of Guangzhou Medical UniversityGuangzhouChina
| | - Xiao Liu
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
| | - Meiting Chen
- Emergency DepartmentThe Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouChina
| | - Wenwei Zhong
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
| | - Yi Zhang
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
- GMU‐GIBH Joint School of Life SciencesGuangzhou Medical UniversityGuangzhouChina
| | - Cien Zhen
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
- Department of Cardiology, School of MedicineSouth China University of TechnologyGuangzhouChina
| | - Yanling Li
- Emergency DepartmentThe Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouChina
| | - Huilin Jiang
- Emergency DepartmentThe Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouChina
| | - Tian Meng
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
| | - Yiming Xu
- Qingyuan People's HospitalThe Sixth Affiliated Hospital of Guangzhou Medical UniversityQingyuanChina
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
- State Key Laboratory of Respiratory DiseaseGuangzhou Medical UniversityGuangzhouChina
| | - Guojun Zhao
- Qingyuan People's HospitalThe Sixth Affiliated Hospital of Guangzhou Medical UniversityQingyuanChina
| | - Du Feng
- Qingyuan People's HospitalThe Sixth Affiliated Hospital of Guangzhou Medical UniversityQingyuanChina
- Guangzhou Municipal and Guangdong Provincial Key hLaboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Affiliated Cancer Hospital and Institute of Guangzhou Medical UniversityGuangzhou Medical UniversityGuangzhouChina
- State Key Laboratory of Respiratory DiseaseGuangzhou Medical UniversityGuangzhouChina
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Dhananjay S, Chandhok G, Neumann B. Novel putative interactors of FZO-1/mitofusin 2 identified using large-scale yeast two-hybrid screening in C. elegans. MICROPUBLICATION BIOLOGY 2022; 2022:10.17912/micropub.biology.000674. [PMID: 36530473 PMCID: PMC9756088 DOI: 10.17912/micropub.biology.000674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 11/23/2022] [Accepted: 11/28/2022] [Indexed: 01/14/2023]
Abstract
Mitochondria are energy-converting organelles that shift between fusion and fission states in order to perform a variety of essential functions. Disruption of these dynamics is detrimental to cellular health and is associated with a range of human diseases. Mitofusin 2 is an essential large GTPase protein that orchestrates fusion of outer mitochondria membranes, and mutations in the encoding gene are causative for Charcot-Marie-Tooth disease. In order to gain further insights into the function of this crucial protein, we have performed large-scale yeast two-hybrid screening to identify interactors of the orthologous protein in Caenorhabditis elegans (FZO-1) . From this screening, we identified 12 novel interactors of FZO-1/mitofusin 2 that, based on their known functions, are strong candidates for further study.
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Affiliation(s)
- Samiksha Dhananjay
- Neuroscience Program, Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne VIC 3800 Australia
| | - Gursimran Chandhok
- Neuroscience Program, Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne VIC 3800 Australia.
,
Correspondence to: Gursimran Chandhok (
)
| | - Brent Neumann
- Neuroscience Program, Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne VIC 3800 Australia.
,
Correspondence to: Brent Neumann (
)
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10
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Bao J, Zhang Y, Wen R, Zhang L, Wang X. Low level of mancozeb exposure affects ovary in mice. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 239:113670. [PMID: 35617905 DOI: 10.1016/j.ecoenv.2022.113670] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 04/19/2022] [Accepted: 05/17/2022] [Indexed: 06/15/2023]
Abstract
Mancozeb (MCZ) is widely used as a protective fungicide. This study aimed to explore the effects of low level MCZ exposure on ovary in mice. Twenty Kunming mice were randomly divided into control and MCZ groups (10 mice each). The mice in the MCZ group were given 100 mg/kg MCZ daily via gavage. The mice were sacrificed to collect serum and ovaries on day 31. The experimental indicators were then assessed. The weight of MCZ-exposed mice significantly reduced while ovarian index significantly increased compared with the control group. The FSH, LH, E2, P, CAT, SOD and MDA contents in the serum were significantly decreased and the content of estradiol significantly increased after MCZ exposure. Histological observation showed that the ovarian structure of mice exposed to MCZ was damaged, and the apoptosis was increased. Immunohistochemistry and RT-qPCR showed that the expression of Bax, caspase-3 and caspase-9 significantly increased in the MCZ- group. Conversely, Bcl-2 expression significantly decreased. Transcriptome sequencing showed that the expression of NADH dehydrogenase ND3, ND4L, ND6 subunits, Cyt b, and SDHC genes in mitochondria were down-regulated after MCZ exposure, similar to real-time PCR analysis. These results collectively indicate that the MCZ can affect the abnormal function of mitochondrial respiratory chain, lead to oxidative phosphorylation decoupling, produce oxidative stress, and finally cause ovarian injury and apoptosis in mice.
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Affiliation(s)
- Jialu Bao
- College of Traditional Chinese Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China
| | - Yan Zhang
- College of Traditional Chinese Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China
| | - Ran Wen
- College of Traditional Chinese Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China
| | - Linchao Zhang
- College of Traditional Chinese Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China
| | - Xiaodan Wang
- College of Traditional Chinese Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China.
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11
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Trease AJ, George JW, Roland NJ, Lichter EZ, Emanuel K, Totusek S, Fox HS, Stauch KL. Hyperphosphorylated Human Tau Accumulates at the Synapse, Localizing on Synaptic Mitochondrial Outer Membranes and Disrupting Respiration in a Mouse Model of Tauopathy. Front Mol Neurosci 2022; 15:852368. [PMID: 35359570 PMCID: PMC8960727 DOI: 10.3389/fnmol.2022.852368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 01/31/2022] [Indexed: 12/24/2022] Open
Abstract
Neurogenerative disorders, such as Alzheimer’s disease (AD), represent a growing public health challenge in aging societies. Tauopathies, a subset of neurodegenerative disorders that includes AD, are characterized by accumulation of fibrillar and hyperphosphorylated forms of microtubule-associated protein tau with coincident mitochondrial abnormalities and neuronal dysfunction. Although, in vitro, tau impairs axonal transport altering mitochondrial distribution, clear in vivo mechanisms associating tau and mitochondrial dysfunction remain obscure. Herein, we investigated the effects of human tau on brain mitochondria in vivo using transgenic htau mice at ages preceding and coinciding with onset of tauopathy. Subcellular proteomics combined with bioenergetic assessment revealed pathologic forms of tau preferentially associate with synaptic over non-synaptic mitochondria coinciding with changes in bioenergetics, reminiscent of an aged synaptic mitochondrial phenotype in wild-type mice. While mitochondrial content was unaltered, mitochondrial maximal respiration was impaired in synaptosomes from htau mice. Further, mitochondria-associated tau was determined to be outer membrane-associated using the trypsin protection assay and carbonate extraction. These findings reveal non-mutant human tau accumulation at the synapse has deleterious effects on mitochondria, which likely contributes to synaptic dysfunction observed in the context of tauopathy.
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12
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Sun D, Niu Z, Zheng HX, Wu F, Jiang L, Han TQ, Wei Y, Wang J, Jin L. A Mitochondrial DNA Variant Elevates the Risk of Gallstone Disease by Altering Mitochondrial Function. Cell Mol Gastroenterol Hepatol 2020; 11:1211-1226.e15. [PMID: 33279689 PMCID: PMC8053626 DOI: 10.1016/j.jcmgh.2020.11.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 11/27/2020] [Accepted: 11/30/2020] [Indexed: 01/06/2023]
Abstract
BACKGROUND AND AIMS Gallstone disease (cholelithiasis) is a cholesterol-related metabolic disorders with strong familial predisposition. Mitochondrial DNA (mtDNA) variants accumulated during human evolution are associated with some metabolic disorders related to modified mitochondrial function. The mechanistic links between mtDNA variants and gallstone formation need further exploration. METHODS In this study, we explored the possible associations of mtDNA variants with gallstone disease by comparing 104 probands and 300 controls in a Chinese population. We constructed corresponding cybrids using trans-mitochondrial technology to investigate the underlying mechanisms of these associations. Mitochondrial respiratory chain complex activity and function and cholesterol metabolism were assessed in the trans-mitochondrial cell models. RESULTS Here, we found a significant association of mtDNA 827A>G with an increased risk of familial gallstone disease in a Chinese population (odds ratio [OR]: 4.5, 95% confidence interval [CI]: 2.1-9.4, P=1.2×10-4). Compared with 827A cybrids (haplogroups B4a and B4c), 827G cybrids (haplogroups B4b and B4d) had impaired mitochondrial respiratory chain complex activity and function and activated JNK and AMPK signaling pathways. Additionally, the 827G cybrids showed disturbances in cholesterol transport and accelerated development of gallstones. Specifically, cholesterol transport through the transporter ABCG5/8 was increased via activation of the AMPK signaling pathway in 827G cybrids. CONCLUSIONS Our findings reveal that mtDNA 827A>G induces aberrant mitochondrial function and abnormal cholesterol transport, resulting in increased occurrence of gallstones. The results provide an important biological basis for the clinical diagnosis and prevention of gallstone disease in the future.
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Affiliation(s)
- Dayan Sun
- State Key Laboratory of Genetic Engineering, School of Life Sciences, and Human Phenome Institute, Fudan University, Shanghai, China; Collaborative Innovation Center for Genetics and Development, Fudan University, Shanghai, China
| | - Zhenmin Niu
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai and Shanghai Academy of Science and Technology, Shanghai, China
| | - Hong-Xiang Zheng
- Collaborative Innovation Center for Genetics and Development, Fudan University, Shanghai, China; Ministry of Education Key Laboratory of Contemporary Anthropology, Department of Anthropology and Human Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Fei Wu
- State Key Laboratory of Genetic Engineering, School of Life Sciences, and Human Phenome Institute, Fudan University, Shanghai, China
| | - Liuyiqi Jiang
- State Key Laboratory of Genetic Engineering, School of Life Sciences, and Human Phenome Institute, Fudan University, Shanghai, China
| | - Tian-Quan Han
- Shanghai Institute of Digestive Surgery, Department of Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yang Wei
- State Key Laboratory of Genetic Engineering, School of Life Sciences, and Human Phenome Institute, Fudan University, Shanghai, China
| | - Jiucun Wang
- State Key Laboratory of Genetic Engineering, School of Life Sciences, and Human Phenome Institute, Fudan University, Shanghai, China; Collaborative Innovation Center for Genetics and Development, Fudan University, Shanghai, China; Research Unit of Dissecting the Population Genetics and Developing New Technologies for Treatment and Prevention of Skin Phenotypes and Dermatological Diseases (2019RU058), Chinese Academy of Medical Sciences, Shanghai, China; Taizhou Institute of Health Sciences, Fudan University, Taizhou, China.
| | - Li Jin
- State Key Laboratory of Genetic Engineering, School of Life Sciences, and Human Phenome Institute, Fudan University, Shanghai, China; Collaborative Innovation Center for Genetics and Development, Fudan University, Shanghai, China; Research Unit of Dissecting the Population Genetics and Developing New Technologies for Treatment and Prevention of Skin Phenotypes and Dermatological Diseases (2019RU058), Chinese Academy of Medical Sciences, Shanghai, China; Taizhou Institute of Health Sciences, Fudan University, Taizhou, China.
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13
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Ould Amer Y, Hebert-Chatelain E. Insight into the Interactome of Intramitochondrial PKA Using Biotinylation-Proximity Labeling. Int J Mol Sci 2020; 21:ijms21218283. [PMID: 33167377 PMCID: PMC7663848 DOI: 10.3390/ijms21218283] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 10/30/2020] [Accepted: 11/02/2020] [Indexed: 12/14/2022] Open
Abstract
Mitochondria are fully integrated in cell signaling. Reversible phosphorylation is involved in adjusting mitochondrial physiology to the cellular needs. Protein kinase A (PKA) phosphorylates several substrates present at the external surface of mitochondria to maintain cellular homeostasis. However, few targets of PKA located inside the organelle are known. The aim of this work was to characterize the impact and the interactome of PKA located inside mitochondria. Our results show that the overexpression of intramitochondrial PKA decreases cellular respiration and increases superoxide levels. Using proximity-dependent biotinylation, followed by LC-MS/MS analysis and in silico phospho-site prediction, we identified 21 mitochondrial proteins potentially targeted by PKA. We confirmed the interaction of PKA with TIM44 using coimmunoprecipitation and observed that TIM44-S80 is a key residue for the interaction between the protein and the kinase. These findings provide insights into the interactome of intramitochondrial PKA and suggest new potential mechanisms in the regulation of mitochondrial functions.
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Affiliation(s)
- Yasmine Ould Amer
- Department of Biology, University of Moncton, Moncton, NB E1A 3E9, Canada;
- Canada Research Chair in Mitochondrial Signaling and Physiopathology, University of Moncton, Moncton, NB E1A 3E9, Canada
| | - Etienne Hebert-Chatelain
- Department of Biology, University of Moncton, Moncton, NB E1A 3E9, Canada;
- Canada Research Chair in Mitochondrial Signaling and Physiopathology, University of Moncton, Moncton, NB E1A 3E9, Canada
- Correspondence:
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14
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Alula KM, Delgado-Deida Y, Jackson DN, Venuprasad K, Theiss AL. Nuclear partitioning of Prohibitin 1 inhibits Wnt/β-catenin-dependent intestinal tumorigenesis. Oncogene 2020; 40:369-383. [PMID: 33144683 PMCID: PMC7856018 DOI: 10.1038/s41388-020-01538-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 10/09/2020] [Accepted: 10/21/2020] [Indexed: 12/19/2022]
Abstract
The Wnt/β-catenin signaling pathway is aberrantly activated in the majority of colorectal cancer cases due to somatic mutations in the adenomatous polyposis coli (APC) gene. Prohibitin 1 (PHB1) serves pleiotropic cellular functions with dynamic subcellular trafficking facilitating signaling crosstalk between organelles. Nuclear-localized PHB1 is an important regulator of gene transcription. Using mice with inducible intestinal epithelial cell (IEC)-specific deletion of Phb1 (Phb1iΔIEC) and mice with IEC-specific overexpression of Phb1 (Phb1Tg), we demonstrate that IEC-specific PHB1 combats intestinal tumorigenesis in the ApcMin/+ mouse model by inhibiting Wnt/β-catenin signaling. Forced nuclear accumulation of PHB1 in human RKO or SW48 CRC cell lines increased AXIN1 expression and decreased cell viability. PHB1 deficiency in CRC cells decreased AXIN1 expression and increased β-catenin activation that was abolished by XAV939, a pharmacological AXIN stabilizer. These results define a role of PHB1 in inhibiting the Wnt/β-catenin pathway to influence the development of intestinal tumorigenesis. Induction of nuclear PHB1 trafficking provides a novel therapeutic option to influence AXIN1 expression and the β-catenin destruction complex in Wnt-driven intestinal tumorigenesis.
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Affiliation(s)
- Kibrom M Alula
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Colorado, Aurora, CO, USA
| | - Yaritza Delgado-Deida
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Colorado, Aurora, CO, USA
| | - Dakota N Jackson
- Department of Internal Medicine, Division of Gastroenterology, Baylor Scott & White Research Institute, Baylor University Medical Center, Dallas, TX, USA
| | - K Venuprasad
- University of Texas Southwestern Medical Center, College of Medicine, Dallas, TX, USA
| | - Arianne L Theiss
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Colorado, Aurora, CO, USA.
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15
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Cui C, Zhu L, Tang X, Xing J, Sheng X, Zhan W. Molecular characterization of prohibitins and their differential responses to WSSV infection in hemocyte subpopulations of Fenneropenaeus chinensis. FISH & SHELLFISH IMMUNOLOGY 2020; 106:296-306. [PMID: 32717325 DOI: 10.1016/j.fsi.2020.07.048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 07/17/2020] [Accepted: 07/21/2020] [Indexed: 06/11/2023]
Abstract
In our previous work, prohibitin1 (PHB1) was identified to be only expressed in granulocytes of Fenneropenaeus chinensis. In order to elucidate the potential immunological properties of prohibitins in hemocyte subpopulations, in this paper, the full-length cDNAs of PHB1 and PHB2 were firstly cloned from F. chinensis using rapid amplification of cDNA ends approach, and they were designated FcPHB1 and FcPHB2, respectively. Based on the sequence analysis and multiple sequence alignment, FcPHB1 and FcPHB2 were members of SPFH protein family. By quantitative real-time RT-PCR, the higher mRNA transcription levels of FcPHB1 and FcPHB2 were detected in intestine and hemocytes of F. chinensis, and these two genes in hemocytes were significantly up-regulated upon WSSV infection. The FcPHB1 and FcPHB2 were recombinantly expressed in Escherichia coli BL21 (DE3), and employed as immunogens to produce the polyclonal antibodies (PAbs) in rabbits. Indirect immunofluorescence assay (IFA) revealed that the FcPHB1 and FcPHB2 were located both in the cytoplasm and nuclei of hemocytes, which could also be specifically recognized by the PAbs against FcPHB1 or FcPHB2 in Western blot. Interestingly, it was found that FcPHB1 and FcPHB2 were only expressed in the granulocytes of heathy shrimp and highly expressed in the WSSV-infected granulocytes, however only weak expressions of FcPHB1 and FcPHB2 were observed in the hyalinocytes of WSSV-infected shrimp. Meanwhile, silencing of FcPHB1 and FcPHB2 genes were performed by small interfering RNA, and the results showed that the WSSV copies in hemocytes were increased by knockdown of either FcPHB1 or FcPHB2, and the cumulative mortalities of shrimp in the silenced groups were also markedly increased. These results demonstrated that FcPHB1 and FcPHB2 played important roles in anti-WSSV infection, and their differential expression characteristics in hemocyte subpopulations provided a further understanding of the immune functions of granulocytes and hyalinocytes.
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Affiliation(s)
- Chuang Cui
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, 266003, China
| | - Lei Zhu
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, 266003, China
| | - Xiaoqian Tang
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China.
| | - Jing Xing
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China
| | - Xiuzhen Sheng
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, 266003, China
| | - Wenbin Zhan
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China
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16
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Jackson DN, Alula KM, Delgado-Deida Y, Tabti R, Turner K, Wang X, Venuprasad K, Souza RF, Désaubry L, Theiss AL. The Synthetic Small Molecule FL3 Combats Intestinal Tumorigenesis via Axin1-Mediated Inhibition of Wnt/β-Catenin Signaling. Cancer Res 2020; 80:3519-3529. [PMID: 32665357 DOI: 10.1158/0008-5472.can-20-0216] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 04/23/2020] [Accepted: 07/09/2020] [Indexed: 12/17/2022]
Abstract
Colorectal cancer exhibits aberrant activation of Wnt/β-catenin signaling. Many inhibitors of the Wnt/β-catenin pathway have been tested for Wnt-dependent cancers including colorectal cancer, but are unsuccessful due to severe adverse reactions. FL3 is a synthetic derivative of natural products called flavaglines, which exhibit anti-inflammatory and cytoprotective properties in intestinal epithelial cells, but has not been previously tested in cell or preclinical models of intestinal tumorigenesis. In vitro studies suggest that flavaglines target prohibitin 1 (PHB1) as a ligand, but this has not been established in the intestine. PHB1 is a highly conserved protein with diverse functions that depend on its posttranslational modifications and subcellular localization. Here, we demonstrate that FL3 combats intestinal tumorigenesis in the azoxymethane-dextran sodium sulfate and ApcMin/+ mouse models and in human colorectal cancer tumor organoids (tumoroids) by inhibiting Wnt/β-catenin signaling via induction of Axin1 expression. FL3 exhibited no change in cell viability in normal intestinal epithelial cells or human matched-normal colonoids. FL3 response was diminished in colorectal cancer cell lines and human colorectal cancer tumoroids harboring a mutation at S45 of β-catenin. PHB1 deficiency in mice or in human colorectal cancer tumoroids abolished FL3-induced expression of Axin1 and drove tumoroid death. In colorectal cancer cells, FL3 treatment blocked phosphorylation of PHB1 at Thr258, resulting in its nuclear translocation and binding to the Axin1 promoter. These results suggest that FL3 inhibits Wnt/β-catenin signaling via PHB1-dependent activation of Axin1. FL3, therefore, represents a novel compound that combats Wnt pathway-dependent cancers, such as colorectal cancer. SIGNIFICANCE: Targeting of PHB1 by FL3 provides a novel mechanism to combat Wnt-driven cancers, with limited intestinal toxicity. GRAPHICAL ABSTRACT: http://cancerres.aacrjournals.org/content/canres/80/17/3519/F1.large.jpg.
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Affiliation(s)
- Dakota N Jackson
- Division of Gastroenterology, Department of Internal Medicine, Baylor Scott & White Research Institute, Baylor University Medical Center, Dallas, Texas
| | - Kibrom M Alula
- Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Aurora, Colorado
| | - Yaritza Delgado-Deida
- Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Aurora, Colorado
| | - Redouane Tabti
- Laboratory of Regenerative Nanomedicine (UMR 1260), INSERM-University of Strasbourg, Strasbourg, France
| | - Kevin Turner
- University of Texas Southwestern Medical Center, College of Medicine, Dallas, Texas
| | - Xuan Wang
- Division of Gastroenterology, Department of Internal Medicine, Baylor Scott & White Research Institute, Baylor University Medical Center, Dallas, Texas
| | - K Venuprasad
- University of Texas Southwestern Medical Center, College of Medicine, Dallas, Texas
| | - Rhonda F Souza
- Division of Gastroenterology, Department of Internal Medicine, Baylor Scott & White Research Institute, Baylor University Medical Center, Dallas, Texas
| | - Laurent Désaubry
- Laboratory of Regenerative Nanomedicine (UMR 1260), INSERM-University of Strasbourg, Strasbourg, France
| | - Arianne L Theiss
- Division of Gastroenterology, Department of Internal Medicine, Baylor Scott & White Research Institute, Baylor University Medical Center, Dallas, Texas. .,Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Aurora, Colorado
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17
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Jadiya P, Tomar D. Mitochondrial Protein Quality Control Mechanisms. Genes (Basel) 2020; 11:genes11050563. [PMID: 32443488 PMCID: PMC7290828 DOI: 10.3390/genes11050563] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/14/2020] [Accepted: 05/15/2020] [Indexed: 02/08/2023] Open
Abstract
Mitochondria serve as a hub for many cellular processes, including bioenergetics, metabolism, cellular signaling, redox balance, calcium homeostasis, and cell death. The mitochondrial proteome includes over a thousand proteins, encoded by both the mitochondrial and nuclear genomes. The majority (~99%) of proteins are nuclear encoded that are synthesized in the cytosol and subsequently imported into the mitochondria. Within the mitochondria, polypeptides fold and assemble into their native functional form. Mitochondria health and integrity depend on correct protein import, folding, and regulated turnover termed as mitochondrial protein quality control (MPQC). Failure to maintain these processes can cause mitochondrial dysfunction that leads to various pathophysiological outcomes and the commencement of diseases. Here, we summarize the current knowledge about the role of different MPQC regulatory systems such as mitochondrial chaperones, proteases, the ubiquitin-proteasome system, mitochondrial unfolded protein response, mitophagy, and mitochondria-derived vesicles in the maintenance of mitochondrial proteome and health. The proper understanding of mitochondrial protein quality control mechanisms will provide relevant insights to treat multiple human diseases.
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Affiliation(s)
- Pooja Jadiya
- Correspondence: (P.J.); (D.T.); Tel.: +1-215-707-9144 (D.T.)
| | - Dhanendra Tomar
- Correspondence: (P.J.); (D.T.); Tel.: +1-215-707-9144 (D.T.)
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18
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Qu Y, Konrad C, Anderson C, Qian L, Yin T, Manfredi G, Iadecola C, Zhou P. Prohibitin S-Nitrosylation Is Required for the Neuroprotective Effect of Nitric Oxide in Neuronal Cultures. J Neurosci 2020; 40:3142-3151. [PMID: 32152200 PMCID: PMC7159891 DOI: 10.1523/jneurosci.1804-19.2020] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 02/25/2020] [Accepted: 02/26/2020] [Indexed: 12/15/2022] Open
Abstract
Prohibitin (PHB) is a critical protein involved in many cellular activities. In brain, PHB resides in mitochondria, where it forms a large protein complex with PHB2 in the inner TFmembrane, which serves as a scaffolding platform for proteins involved in mitochondrial structural and functional integrity. PHB overexpression at moderate levels provides neuroprotection in experimental brain injury models. In addition, PHB expression is involved in ischemic preconditioning, as its expression is enhanced in preconditioning paradigms. However, the mechanisms of PHB functional regulation are still unknown. Observations that nitric oxide (NO) plays a key role in ischemia preconditioning compelled us to postulate that the neuroprotective effect of PHB could be regulated by NO. Here, we test this hypothesis in a neuronal model of ischemia-reperfusion injury and show that NO and PHB are mutually required for neuronal resilience against oxygen and glucose deprivation stress. Further, we demonstrate that NO post-translationally modifies PHB through protein S-nitrosylation and regulates PHB neuroprotective function, in a nitric oxide synthase-dependent manner. These results uncover the mechanisms of a previously unrecognized form of molecular regulation of PHB that underlies its neuroprotective function.SIGNIFICANCE STATEMENT Prohibitin (PHB) is a critical mitochondrial protein that exerts a potent neuroprotective effect when mildly upregulated in mice. However, how the neuroprotective function of PHB is regulated is still unknown. Here, we demonstrate a novel regulatory mechanism for PHB that involves nitric oxide (NO) and shows that PHB and NO interact directly, resulting in protein S-nitrosylation on residue Cys69 of PHB. We further show that nitrosylation of PHB may be essential for its ability to preserve neuronal viability under hypoxic stress. Thus, our study reveals a previously unknown mechanism of functional regulation of PHB that has potential therapeutic implications for neurologic disorders.
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Affiliation(s)
- Youyang Qu
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
- Department of Neurology, 2nd Affiliated Hospital of Harbin Medical University, Harbin 150086, People's Republic of China
| | - Csaba Konrad
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
| | - Corey Anderson
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
| | - Liping Qian
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
| | - Tina Yin
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
| | - Giovanni Manfredi
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
| | - Costantino Iadecola
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
| | - Ping Zhou
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York 10065, and
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19
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Fisher JJ, McKeating DR, Cuffe JS, Bianco-Miotto T, Holland OJ, Perkins AV. Proteomic Analysis of Placental Mitochondria Following Trophoblast Differentiation. Front Physiol 2019; 10:1536. [PMID: 31920727 PMCID: PMC6933824 DOI: 10.3389/fphys.2019.01536] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 12/05/2019] [Indexed: 12/15/2022] Open
Abstract
As gestation proceeds the human placenta is in a constant state of renewal and placental debris is released into the maternal circulation where it can trigger adverse physiological and immunological responses. Trophoblast cells of the placenta differentiate from mononuclear cytotrophoblast cells to fuse and form the syncytiotrophoblast, a multinuclear layer that covers the entire surface of the placenta. As part of this process there are significant changes to cellular cytoskeletal organization and organelle morphology. In this study we have examined the molecular changes that occur in mitochondria from these two cellular compartments and identified differential expression of key proteins that underpin changes in mitochondrial morphology, metabolism and function. Mitochondria were isolated for term placental tissue and separated according to size and density by sequential differential centrifugation. Isolated mitochondrial populations were then subjected to proteomics using HPLC separation of peptides and MS identification. Differential expression of proteins of interest was confirmed by western blots. Using a bioinformatics approach we also examined published protein databases to confirm our observations. In total 651 proteins were differentially regulated in mitochondria from cytotrophoblast versus syncytiotrophoblast. Of these 29 were statistically significant and chosen for subsequent analysis. These included subunits of ATP synthase that would affect ATP production and cristae structure, carbohydrate metabolizing enzymes phospoenolpyruvate carboxykinase-2, pyruvate carboxylase (PC) and pyruvate dehydrogenase (PDH), fatty acid metabolizing enzyme acyl-CoA dehydrogenase, stress responses such a glucose regulated protein-78 and protein disulfide isomerase, and mitochondrial dynamics proteins mitofusin 1 and 2. Placental cell biology and mitochondrial function is central to the pathogenesis of many gestational disorders such as preeclampsia, pre-term birth, fetal growth restriction and gestational diabetes. These studies show important shifts in mitochondrial metabolism and dynamics post trophoblast differentiation and provide key molecular targets for study in pathological pregnancies.
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Affiliation(s)
- Joshua J Fisher
- School of Medical Science, Griffith Health, Griffith University, Southport, QLD, Australia
| | - Daniel R McKeating
- School of Medical Science, Griffith Health, Griffith University, Southport, QLD, Australia
| | - James S Cuffe
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, St Lucia, QLD, Australia
| | - Tina Bianco-Miotto
- School of Agriculture, Food and Wine, Robinson Research Institute, University of Adelaide, Adelaide, SA, Australia
| | - Olivia J Holland
- School of Medical Science, Griffith Health, Griffith University, Southport, QLD, Australia
| | - Anthony V Perkins
- School of Medical Science, Griffith Health, Griffith University, Southport, QLD, Australia
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20
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Scheidecker S, Bär S, Stoetzel C, Geoffroy V, Lannes B, Rinaldi B, Fischer F, Becker HD, Pelletier V, Pagan C, Acquaviva-Bourdain C, Kremer S, Mirande M, Tranchant C, Muller J, Friant S, Dollfus H. Mutations in KARS cause a severe neurological and neurosensory disease with optic neuropathy. Hum Mutat 2019; 40:1826-1840. [PMID: 31116475 DOI: 10.1002/humu.23799] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 04/25/2019] [Accepted: 05/15/2019] [Indexed: 11/09/2022]
Abstract
Mutations in genes encoding aminoacyl-tRNA synthetases have been reported in several neurological disorders. KARS is a dual localized lysyl-tRNA synthetase and its cytosolic isoform belongs to the multiple aminoacyl-tRNA synthetase complex (MSC). Biallelic mutations in the KARS gene were described in a wide phenotypic spectrum ranging from nonsyndromic deafness to complex impairments. Here, we report on a patient with severe neurological and neurosensory disease investigated by whole-exome sequencing and found to carry biallelic mutations c.683C>T (p.Pro228Leu) and c.871T>G (p.Phe291Val), the second one being novel, in the KARS gene. The patient presented with an atypical clinical presentation with an optic neuropathy not previously reported. At the cellular level, we show that cytoplasmic KARS was expressed at a lower level in patient cells and displayed decreased interaction with MSC. In vitro, these two KARS variants have a decreased aminoacylation activity compared with wild-type KARS, the p.Pro228Leu being the most affected. Our data suggest that dysfunction of cytoplasmic KARS resulted in a decreased level of translation of the nuclear-encoded lysine-rich proteins belonging to the respiratory chain complex, thus impairing mitochondria functions.
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Affiliation(s)
- Sophie Scheidecker
- Laboratoire de Génétique Médicale, INSERM U1112, Institut de Génétique Médicale d'Alsace, Université de Strasbourg, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Séverine Bär
- Laboratoire de Génétique Moléculaire, Génomique, Microbiologie (GMGM), UMR7156, Université de Strasbourg, CNRS, Strasbourg, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, INSERM U1112, Institut de Génétique Médicale d'Alsace, Université de Strasbourg, Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, INSERM U1112, Institut de Génétique Médicale d'Alsace, Université de Strasbourg, Strasbourg, France
| | - Béatrice Lannes
- Service d'Anatomo-pathologie, Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Strasbourg, France
| | - Bruno Rinaldi
- Laboratoire de Génétique Moléculaire, Génomique, Microbiologie (GMGM), UMR7156, Université de Strasbourg, CNRS, Strasbourg, France
| | - Frédéric Fischer
- Laboratoire de Génétique Moléculaire, Génomique, Microbiologie (GMGM), UMR7156, Université de Strasbourg, CNRS, Strasbourg, France
| | - Hubert D Becker
- Laboratoire de Génétique Moléculaire, Génomique, Microbiologie (GMGM), UMR7156, Université de Strasbourg, CNRS, Strasbourg, France
| | - Valérie Pelletier
- Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Cécile Pagan
- Service de Biochimie et Biologie Moléculaire, Centre de Biologie et de Pathologie Est, Hospices Civils de Lyon, Lyon, France
| | - Cécile Acquaviva-Bourdain
- Service de Biochimie et Biologie Moléculaire, Centre de Biologie et de Pathologie Est, Hospices Civils de Lyon, Lyon, France
| | - Stéphane Kremer
- Service de Neuroradiologie/Imagerie 2, CHU de Strasbourg, Hôpital de Hautepierre, Strasbourg, France
| | - Marc Mirande
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, University Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Christine Tranchant
- Service de Neurologie Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Strasbourg, France
| | - Jean Muller
- Laboratoire de Génétique Médicale, INSERM U1112, Institut de Génétique Médicale d'Alsace, Université de Strasbourg, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Sylvie Friant
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, INSERM U1112, Institut de Génétique Médicale d'Alsace, Université de Strasbourg, Strasbourg, France.,Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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Signorile A, Sgaramella G, Bellomo F, De Rasmo D. Prohibitins: A Critical Role in Mitochondrial Functions and Implication in Diseases. Cells 2019; 8:cells8010071. [PMID: 30669391 PMCID: PMC6356732 DOI: 10.3390/cells8010071] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/10/2019] [Accepted: 01/15/2019] [Indexed: 12/11/2022] Open
Abstract
Prohibitin 1 (PHB1) and prohibitin 2 (PHB2) are proteins that are ubiquitously expressed, and are present in the nucleus, cytosol, and mitochondria. Depending on the cellular localization, PHB1 and PHB2 have distinctive functions, but more evidence suggests a critical role within mitochondria. In fact, PHB proteins are highly expressed in cells that heavily depend on mitochondrial function. In mitochondria, these two proteins assemble at the inner membrane to form a supra-macromolecular structure, which works as a scaffold for proteins and lipids regulating mitochondrial metabolism, including bioenergetics, biogenesis, and dynamics in order to determine the cell fate, death, or life. PHB alterations have been found in aging and cancer, as well as neurodegenerative, cardiac, and kidney diseases, in which significant mitochondrial impairments have been observed. The molecular mechanisms by which prohibitins regulate mitochondrial function and their role in pathology are reviewed and discussed herein.
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Affiliation(s)
- Anna Signorile
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari "Aldo Moro", 70124 Bari, Italy.
| | - Giuseppe Sgaramella
- Water Research Institute (IRSA), National Research Council (CNR), Viale F. De Blasio, 5, 70132 Bari, Italy.
| | - Francesco Bellomo
- Laboratory of Nephrology, Department of Rare Diseases, Bambino Gesù Children's Hospital, Viale di S. Paolo, 15, 00149 Rome, Italy.
| | - Domenico De Rasmo
- Institute of Biomembrane, Bioenergetics and Molecular Biotechnology (IBIOM), National Research Council (CNR), 70126 Bari, Italy.
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Deoxynivalenol Affects Cell Metabolism and Increases Protein Biosynthesis in Intestinal Porcine Epithelial Cells (IPEC-J2): DON Increases Protein Biosynthesis. Toxins (Basel) 2018; 10:toxins10110464. [PMID: 30423940 PMCID: PMC6266275 DOI: 10.3390/toxins10110464] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/22/2018] [Accepted: 11/06/2018] [Indexed: 12/16/2022] Open
Abstract
Deoxynivalenol (DON) is a toxin found in cereals as well as in processed products such as pasta, and causes substantial economic losses for stock breeding as it induces vomiting, reduced feeding, and reduced growth rates in piglets. Oxidative phosphorylation, TCA-cycle, transcription, and translation have been hypothesized to be leading pathways that are affected by DON. We used an application of high and low glucose to examine oxidative phosphorylation and anaerobic glycolysis. A change in the metabolic status of IPEC-J2 was observed and confirmed by microarray data. Measurements of oxygen consumption resulted in a significant reduction, if DON attacks from the basolateral. Furthermore, we found a dose-dependent effect with a significant reduction at 2000 ng/mL. In addition, SLC7A11 and PHB, the genes with the highest regulation in our microarray analyses under low glucose supply, were investigated and showed a variable regulation on protein level. Lactate production and glucose consumption was investigated to examine the impact of DON on anaerobic glycolysis and we observed a significant increase in 2000 blhigh and a decrease in 2000 aphigh. Interestingly, both groups as well as 200 blhigh showed a significant higher de novo protein synthesis when compared to the control. These results indicate the direct or indirect impact of DON on metabolic pathways in IPEC-J2.
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23
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Anderson CJ, Kahl A, Qian L, Stepanova A, Starkov A, Manfredi G, Iadecola C, Zhou P. Prohibitin is a positive modulator of mitochondrial function in PC12 cells under oxidative stress. J Neurochem 2018; 146:235-250. [PMID: 29808474 PMCID: PMC6105506 DOI: 10.1111/jnc.14472] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 04/10/2018] [Accepted: 05/23/2018] [Indexed: 12/15/2022]
Abstract
Prohibitin (PHB) is a ubiquitously expressed and evolutionarily conserved mitochondrial protein with multiple functions. We have recently shown that PHB up-regulation offers robust protection against neuronal injury in models of cerebral ischemia in vitro and in vivo, but the mechanism by which PHB affords neuroprotection remains to be elucidated. Here, we manipulated PHB expression in PC12 neural cells to investigate its impact on mitochondrial function and the mechanisms whereby it protects cells exposed to oxidative stress. PHB over-expression promoted cell survival, whereas PHB down-regulation diminished cell viability. Functionally, manipulation of PHB levels did not affect basal mitochondrial respiration, but it increased spare respiratory capacity. Moreover, PHB over-expression preserved mitochondrial respiratory function of cells exposed to oxidative stress. Preserved respiratory capacity in differentiated PHB over-expressing cells exposed to oxidative stress was associated with an elongated mitochondrial morphology, whereas PHB down-regulation enhanced fragmentation. Mitochondrial complex I oxidative degradation was attenuated by PHB over-expression and increased in PHB knockdown cells. Changes in complex I degradation were associated with alterations of respiratory chain supercomplexes. Furthermore, we showed that PHB directly interacts with cardiolipin and that down-regulation of PHB results in loss of cardiolipin in mitochondria, which may contribute to destabilizing respiratory chain supercomplexes. Taken together, these data demonstrate that PHB modulates mitochondrial integrity and bioenergetics under oxidative stress, and suggest that the protective effect of PHB is mediated by stabilization of the mitochondrial respiratory machinery and its functional capacity, by the regulation of cardiolipin content. Open Data: Materials are available on https://cos.io/our-services/open-science-badges/ https://osf.io/93n6m/.
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Affiliation(s)
| | | | - Liping Qian
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61 Street, New York, NY 10065
| | - Anna Stepanova
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61 Street, New York, NY 10065
| | - Anatoly Starkov
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61 Street, New York, NY 10065
| | - Giovanni Manfredi
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61 Street, New York, NY 10065
| | - Costantino Iadecola
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61 Street, New York, NY 10065
| | - Ping Zhou
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61 Street, New York, NY 10065
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24
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Ale-Agha N, Goy C, Jakobs P, Spyridopoulos I, Gonnissen S, Dyballa-Rukes N, Aufenvenne K, von Ameln F, Zurek M, Spannbrucker T, Eckermann O, Jakob S, Gorressen S, Abrams M, Grandoch M, Fischer JW, Köhrer K, Deenen R, Unfried K, Altschmied J, Haendeler J. CDKN1B/p27 is localized in mitochondria and improves respiration-dependent processes in the cardiovascular system-New mode of action for caffeine. PLoS Biol 2018; 16:e2004408. [PMID: 29927970 PMCID: PMC6013014 DOI: 10.1371/journal.pbio.2004408] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 05/18/2018] [Indexed: 12/16/2022] Open
Abstract
We show that the cyclin-dependent kinase inhibitor 1B (CDKN1B)/p27, previously known as a cell cycle inhibitor, is also localized within mitochondria. The migratory capacity of endothelial cells, which need intact mitochondria, is completely dependent on mitochondrial p27. Mitochondrial p27 improves mitochondrial membrane potential, increases adenosine triphosphate (ATP) content, and is required for the promigratory effect of caffeine. Domain mapping of p27 revealed that the N-terminus and C-terminus are required for those improvements. Further analysis of those regions revealed that the translocation of p27 into the mitochondria and its promigratory activity depend on serine 10 and threonine 187. In addition, mitochondrial p27 protects cardiomyocytes against apoptosis. Moreover, mitochondrial p27 is necessary and sufficient for cardiac myofibroblast differentiation. In addition, p27 deficiency and aging decrease respiration in heart mitochondria. Caffeine does not increase respiration in p27-deficient animals, whereas aged mice display improvement after 10 days of caffeine in drinking water. Moreover, caffeine induces transcriptome changes in a p27-dependent manner, affecting mostly genes relevant for mitochondrial processes. Caffeine also reduces infarct size after myocardial infarction in prediabetic mice and increases mitochondrial p27. Our data characterize mitochondrial p27 as a common denominator that improves mitochondria-dependent processes and define an increase in mitochondrial p27 as a new mode of action of caffeine.
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Affiliation(s)
- Niloofar Ale-Agha
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Christine Goy
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Philipp Jakobs
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Ioakim Spyridopoulos
- Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Stefanie Gonnissen
- Core Unit Biosafety Level 2 Laboratory, IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Nadine Dyballa-Rukes
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Karin Aufenvenne
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Florian von Ameln
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
- Core Unit Biosafety Level 2 Laboratory, IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Mark Zurek
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Tim Spannbrucker
- Environmentally-induced Skin and Lung Aging, IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Olaf Eckermann
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Sascha Jakob
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Simone Gorressen
- Institute for Pharmacology and Clinical Pharmacology, Medical Faculty, HHU Duesseldorf, Duesseldorf, Germany
| | - Marcel Abrams
- Institute for Pharmacology and Clinical Pharmacology, Medical Faculty, HHU Duesseldorf, Duesseldorf, Germany
| | - Maria Grandoch
- Institute for Pharmacology and Clinical Pharmacology, Medical Faculty, HHU Duesseldorf, Duesseldorf, Germany
| | - Jens W. Fischer
- Institute for Pharmacology and Clinical Pharmacology, Medical Faculty, HHU Duesseldorf, Duesseldorf, Germany
| | - Karl Köhrer
- Biological and Medical Research Center (BMFZ), HHU, Duesseldorf, Germany
| | - René Deenen
- Biological and Medical Research Center (BMFZ), HHU, Duesseldorf, Germany
| | - Klaus Unfried
- Environmentally-induced Skin and Lung Aging, IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Joachim Altschmied
- Core Unit Biosafety Level 2 Laboratory, IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Judith Haendeler
- Heisenberg-group—Environmentally-induced Cardiovascular Degeneration, Medical Faculty, HHU Duesseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
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25
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Accumulation of prohibitin is a common cellular response to different stressing stimuli and protects melanoma cells from ER stress and chemotherapy-induced cell death. Oncotarget 2018; 8:43114-43129. [PMID: 28562344 PMCID: PMC5522132 DOI: 10.18632/oncotarget.17810] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 04/19/2017] [Indexed: 01/01/2023] Open
Abstract
Melanoma is responsible for most deaths among skin cancers and conventional and palliative care chemotherapy are limited due to the development of chemoresistance. We used proteomic analysis to identify cellular responses that lead to chemoresistance of human melanoma cell lines to cisplatin. A systems approach to the proteomic data indicated the participation of specific cellular processes such as oxidative phosphorylation, mitochondrial organization and homeostasis, as well as the unfolded protein response (UPR) to be required for the survival of cells treated with cisplatin. Prohibitin (PHB) was among the proteins consistently accumulated, interacting with the functional clusters associated with resistance to cisplatin. We showed PHB accumulated at different levels in melanoma cell lines under stressing stimuli, such as (i) treatment with temozolomide (TMZ), dacarbazine (DTIC) and cisplatin; (ii) serum deprivation; (iii) tunicamycin, an UPR inducer. Prohibitin accumulated in the mitochondria of melanoma cells after cisplatin and tunicamycin treatment and its de novo accumulation led to chemoresistance melanoma cell lines. In contrast, PHB knock-down sensitized melanoma cells to cisplatin and tunicamycin treatment. We conclude that PHB participates in the survival of cells exposed to different stress stimuli, and can therefore serve as a target for the sensitization of melanoma cells to chemotherapy.
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Chang JS, Ha K. A truncated PPAR gamma 2 localizes to mitochondria and regulates mitochondrial respiration in brown adipocytes. PLoS One 2018; 13:e0195007. [PMID: 29566074 PMCID: PMC5864067 DOI: 10.1371/journal.pone.0195007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/14/2018] [Indexed: 12/11/2022] Open
Abstract
Peroxisome proliferator-activated receptor gamma (PPARγ) is a key regulator of brown adipocyte differentiation and thermogenesis. The PPARγ gene produces two isoforms, PPARγ1 and PPARγ2. PPARγ2 is identical to PPARγ1 except for additional 30 amino acids present in the N-terminus of PPARγ2. Here we report that the C-terminally truncated form of PPARγ2 is predominantly present in the mitochondrial matrix of brown adipocytes and that it binds to the D-loop region of mitochondrial DNA (mtDNA), which contains the promoter for mitochondrial electron transport chain (ETC) genes. Expression of mitochondrially targeted MLS-PPARγ2 in brown adipocytes increases mtDNA-encoded ETC gene expression concomitant with enhanced mitochondrial respiration. These results suggest that direct regulation of mitochondrially encoded ETC gene expression by mitochondrial PPARγ2, in part, underlies the isoform-specific role for PPARγ2 in brown adipocytes.
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Affiliation(s)
- Ji Suk Chang
- Laboratory of Gene Regulation and Metabolism, Pennington Biomedical Research Center, Baton Rouge, Louisiana, United States of America
- * E-mail:
| | - Kyoungsoo Ha
- Laboratory of Gene Regulation and Metabolism, Pennington Biomedical Research Center, Baton Rouge, Louisiana, United States of America
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27
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Mitochondrial Mutations in Cholestatic Liver Disease with Biliary Atresia. Sci Rep 2018; 8:905. [PMID: 29343773 PMCID: PMC5772057 DOI: 10.1038/s41598-017-18958-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 12/19/2017] [Indexed: 12/25/2022] Open
Abstract
Biliary atresia (BA) results in severe bile blockage and is caused by the absence of extrahepatic ducts. Even after successful hepatic portoenterostomy, a considerable number of patients are likely to show progressive deterioration in liver function. Recent studies show that mutations in protein-coding mitochondrial DNA (mtDNA) genes and/or mitochondrial genes in nuclear DNA (nDNA) are associated with hepatocellular dysfunction. This observation led us to investigate whether hepatic dysfunctions in BA is genetically associated with mtDNA mutations. We sequenced the mtDNA protein-coding genes in 14 liver specimens from 14 patients with BA and 5 liver specimens from 5 patients with choledochal cyst using next-generation sequencing. We found 34 common non-synonymous variations in mtDNA protein-coding genes in all patients examined. A systematic 3D structural analysis revealed the presence of several single nucleotide polymorphism-like mutations in critical regions of complexes I to V, that are involved in subunit assembly, proton-pumping activity, and/or supercomplex formation. The parameters of chronic hepatic injury and liver dysfunction in BA patients were also significantly correlated with the extent of hepatic failure, suggesting that the mtDNA mutations may aggravate hepatopathy. Therefore, mitochondrial mutations may underlie the pathological mechanisms associated with BA.
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28
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Satheesh Kumar MK, Nair S, Mony U, Kalingavarman S, Venkat R, Sivanarayanan TB, Unni AKK, Rajeshkannan R, Anandakuttan A, Radhakrishnan S, Menon KN. Significance of elevated Prohibitin 1 levels in Multiple Sclerosis patients lymphocytes towards the assessment of subclinical disease activity and its role in the central nervous system pathology of disease. Int J Biol Macromol 2017; 110:573-581. [PMID: 29242126 DOI: 10.1016/j.ijbiomac.2017.12.061] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 11/26/2017] [Accepted: 12/10/2017] [Indexed: 12/18/2022]
Abstract
Multiple Sclerosis (MS) is an autoimmune-neurodegenerative disorder managed therapeutically by modulating lymphocytes activity which has potential in disease management. Prohibitin 1(PHB) that controls the reactive oxygen species (ROS) and present on the activated lymphocytes have significance in the therapy of MS as esters of fumaric acid that regulates ROS is in phase II/III clinical trials. Thus, we evaluated the expression levels of PHB1 in experimental autoimmune encephalomyelitis (EAE), the animal model of MS and on MS patient's lymphocytes. PHB levels in brain tissue of EAE animals were determined by immunoblotting and on blood lymphocytes from MS relapse, Remission, Optic Neuritis, Neurological controls and Healthy volunteers by FACS using anti-PHB and anti-CD45 antibodies. We observed significant elevation of PHB in EAE brains (91.0 ± 17.59%) vs controls (29.8 ± 12.9%) (p = 0.01) and on lymphocytes of MS patients in acute (73.5 ± 11.20%) or relapsing (69.3 ± 17.33%) phase compared to remission (45.9 ± 8.08%) [p = 0.034 acute vs remission; p = 0.004 relapse vs remission]. Up regulation of PHB in relapsing vs remission MS patients imply the potential use of PHB to clinically evaluate subclinical disease status towards prognosis of an oncoming relapse. Elevated PHB levels in EAE brains signify the role of PHB in regulating ROS and implies PHB's role in oxidative stress.
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Affiliation(s)
| | - Sreepriya Nair
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, 682041, Kerala, India
| | - Ullas Mony
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, 682041, Kerala, India
| | - Sugavanan Kalingavarman
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, 682041, Kerala, India
| | - Ramaswamynathan Venkat
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, 682041, Kerala, India
| | | | | | - Ramiah Rajeshkannan
- Department of Radiation Oncology, Amrita Vishwa Vidyapeetham, Kochi, 682041, Kerala, India
| | | | | | - Krishnakumar N Menon
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, 682041, Kerala, India.
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Jian C, Xu F, Hou T, Sun T, Li J, Cheng H, Wang X. Deficiency of PHB complex impairs respiratory supercomplex formation and activates mitochondrial flashes. J Cell Sci 2017. [PMID: 28630166 DOI: 10.1242/jcs.198523] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Prohibitins (PHBs; prohibitin 1, PHB1 or PHB, and prohibitin 2, PHB2) are evolutionarily conserved and ubiquitously expressed mitochondrial proteins. PHBs form multimeric ring complexes acting as scaffolds in the inner mitochondrial membrane. Mitochondrial flashes (mitoflashes) are newly discovered mitochondrial signaling events that reflect electrical and chemical excitations of the organelle. Here, we investigate the possible roles of PHBs in the regulation of mitoflash signaling. Downregulation of PHBs increases mitoflash frequency by up to 5.4-fold due to elevated basal reactive oxygen species (ROS) production in the mitochondria. Mechanistically, PHB deficiency impairs the formation of mitochondrial respiratory supercomplexes (RSCs) without altering the abundance of individual respiratory complex subunits. These impairments induced by PHB deficiency are effectively rescued by co-expression of PHB1 and PHB2, indicating that the multimeric PHB complex acts as the functional unit. Furthermore, downregulating other RSC assembly factors, including SCAFI (also known as COX7A2L), RCF1a (HIGD1A), RCF1b (HIGD2A), UQCC3 and SLP2 (STOML2), all activate mitoflashes through elevating mitochondrial ROS production. Our findings identify the PHB complex as a new regulator of RSC formation and mitoflash signaling, and delineate a general relationship among RSC formation, basal ROS production and mitoflash biogenesis.
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Affiliation(s)
- Chongshu Jian
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Fengli Xu
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Tingting Hou
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Tao Sun
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Jinghang Li
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Heping Cheng
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Xianhua Wang
- State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
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Chang JS, Ha K. An unexpected role for the transcriptional coactivator isoform NT-PGC-1α in the regulation of mitochondrial respiration in brown adipocytes. J Biol Chem 2017; 292:9958-9966. [PMID: 28473468 DOI: 10.1074/jbc.m117.778373] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 05/02/2017] [Indexed: 02/05/2023] Open
Abstract
Brown adipose tissue dissipates energy as heat, a process that relies on a high abundance of mitochondria and high levels of electron transport chain (ETC) complexes within these mitochondria. Two regulators of mitochondrial respiration and heat production in brown adipocytes are the transcriptional coactivator PGC-1α and its splicing isoform NT-PGC-1α, which control mitochondrial gene expression in the nucleus. Surprisingly, we found that, in brown adipocytes, some NT-PGC-1α localizes to mitochondria, whereas PGC-1α resides in the nucleus. Here we sought to investigate the role of NT-PGC-1α in brown adipocyte mitochondria. Immunocytochemistry, immunotransmission electron microscopy, and biochemical analyses indicated that NT-PGC-1α was located in the mitochondrial matrix in brown adipocytes. NT-PGC-1α was specifically enriched at the D-loop region of the mtDNA, which contains the promoters for several essential ETC complex genes, and was associated with LRP130, an activator of mitochondrial transcription. Selective expression of NT-PGC-1α and PGC-1α in PGC-1α-/- brown adipocytes similarly induced expression of nuclear DNA-encoded mitochondrial ETC genes, including the key mitochondrial transcription factor A (TFAM). Despite having comparable levels of TFAM expression, PGC-1α-/- brown adipocytes expressing NT-PGC-1α had higher expression of mtDNA-encoded ETC genes than PGC-1α-/- brown adipocytes expressing PGC-1α, suggesting a direct effect of NT-PGC-1α on mtDNA transcription. Moreover, this increase in mtDNA-encoded ETC gene expression was associated with enhanced respiration in NT-PGC-1α-expressing PGC-1α-/- brown adipocytes. Our findings reveal a previously unappreciated and isoform-specific role for NT-PGC-1α in the regulation of mitochondrial transcription in brown adipocytes and provide new insight into the transcriptional control of mitochondrial respiration.
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Affiliation(s)
- Ji Suk Chang
- From the Laboratory of Gene Regulation and Metabolism, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - Kyoungsoo Ha
- From the Laboratory of Gene Regulation and Metabolism, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
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Dutta D, Ali N, Banerjee E, Singh R, Naskar A, Paidi RK, Mohanakumar KP. Low Levels of Prohibitin in Substantia Nigra Makes Dopaminergic Neurons Vulnerable in Parkinson's Disease. Mol Neurobiol 2017; 55:804-821. [PMID: 28062948 DOI: 10.1007/s12035-016-0328-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 11/29/2016] [Indexed: 12/18/2022]
Abstract
Since substantia nigra (SN) and ventral tegmental area (VTA) dopaminergic neurons are, respectively, susceptible or largely unaffected in Parkinson's disease (PD), we searched for protein(s) that regulates this differential sensitivity. Differentially, expressed proteins in SN and VTA were investigated employing two-directional gel electrophoresis- matrix-assisted laser desorption ionization time of flight (MALDI-TOF-TOF) analyses. Prohibitin, which is involved in mitochondrial integrity, was validated using immunoblot, qRT-PCR, and immunohistochemistry in normal mice as well as 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-model, PD postmortem human brains, and PD cybrids. In prohibitin over-expression, differentiated SH-SY5Y neurons were investigated for their susceptibility to PD neurotoxin, 1-methyl-4-phenyl-pyridnium (MPP+). Prohibitin, Hsc73, and Cu-Zn superoxide dismutase (Cu-Zn SOD) were highly expressed in VTA, whereas heat shock protein A8 (HSPA8) and 14-3-3ζ/δ were 2-fold more in SN. Prohibitin level was transiently increased in SN but unaltered in VTA on the third day of MPTP-induced mice, whereas in PD human brains, prohibitin was depleted in both these regions. Parallel to mouse SN, an enhanced prohibitin expression was found in human PD cybrids. In MPP+-induced cellular model of PD, reduction in prohibitin level was found to be associated with a loss in its binding with Ndufs3, a mitochondrial complex I protein partner. Prohibitin over-expression resisted MPP+-induced neuronal death by restoring mitochondrial membrane potential, preventing reactive oxygen species generation and cytochrome c release into cytosol. These protective phenomena exerted by prohibitin over-expression altogether hinder caspase 3 activation induced by MPP+. These results imply that prohibitin is an important negotiator protein that regulates dopaminergic cell death in SN and their protection in VTA in PD.
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Affiliation(s)
- Debashis Dutta
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Nilufar Ali
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Emili Banerjee
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Raghavendra Singh
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Amit Naskar
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Ramesh Kumar Paidi
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Kochupurackal P Mohanakumar
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India. .,Inter University Centre for Biomedical Research and Super Speciality Hospital, Mahatma Gandhi University Campus at Thalappady, Rubber Board P.O, Kottayam, Kerala, 686009, India.
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Sripathi SR, Sylvester O, He W, Moser T, Um JY, Lamoke F, Ramakrishna W, Bernstein PS, Bartoli M, Jahng WJ. Prohibitin as the Molecular Binding Switch in the Retinal Pigment Epithelium. Protein J 2016; 35:1-16. [PMID: 26661103 DOI: 10.1007/s10930-015-9641-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Previously, our molecular binding study showed that prohibitin interacts with phospholipids, including phosphatidylinositide and cardiolipin. Under stress conditions, prohibitin interacts with cardiolipin as a retrograde response to activate mitochondrial proliferation. The lipid-binding switch mechanism of prohibitin with phosphatidylinositol-3,4,5-triphosphate and cardiolipin may suggest the role of prohibitin effects on energy metabolism and age-related diseases. The current study examined the region-specific expressions of prohibitin with respect to the retina and retinal pigment epithelium (RPE) in age-related macular degeneration (AMD). A detailed understanding of prohibitin binding with lipids, nucleotides, and proteins shown in the current study may suggest how molecular interactions control apoptosis and how we can intervene against the apoptotic pathway in AMD. Our data imply that decreased prohibitin in the peripheral RPE is a significant step leading to mitochondrial dysfunction that may promote AMD progression.
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Affiliation(s)
- Srinivas R Sripathi
- Department of Biological Sciences, Michigan Technological University, Houghton, MI, 49931, USA.,Department of Ophthalmology, Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, 21287, USA
| | - O'Donnell Sylvester
- Retina Proteomics Laboratory, Department of Petroleum Chemistry, American University of Nigeria, Yola, Nigeria
| | - Weilue He
- Department of Biological Sciences, Michigan Technological University, Houghton, MI, 49931, USA
| | - Trevor Moser
- Department of Biological Sciences, Michigan Technological University, Houghton, MI, 49931, USA
| | - Ji-Yeon Um
- Department of Biological Sciences, Michigan Technological University, Houghton, MI, 49931, USA
| | - Folami Lamoke
- Department of Ophthalmology, Georgia Regents University, Augusta, GA, 30912, USA
| | - Wusirika Ramakrishna
- Department of Biological Sciences, Michigan Technological University, Houghton, MI, 49931, USA
| | - Paul S Bernstein
- Department of Ophthalmology and Visual Sciences, Moran Eye Center, University of Utah School of Medicine, Salt Lake City, UT, 84132, USA
| | - Manuela Bartoli
- Department of Ophthalmology, Georgia Regents University, Augusta, GA, 30912, USA
| | - Wan Jin Jahng
- Retina Proteomics Laboratory, Department of Petroleum Chemistry, American University of Nigeria, Yola, Nigeria.
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Moncunill-Massaguer C, Saura-Esteller J, Pérez-Perarnau A, Palmeri CM, Núñez-Vázquez S, Cosialls AM, González-Gironès DM, Pomares H, Korwitz A, Preciado S, Albericio F, Lavilla R, Pons G, Langer T, Iglesias-Serret D, Gil J. A novel prohibitin-binding compound induces the mitochondrial apoptotic pathway through NOXA and BIM upregulation. Oncotarget 2016; 6:41750-65. [PMID: 26497683 PMCID: PMC4747186 DOI: 10.18632/oncotarget.6154] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 09/30/2015] [Indexed: 01/08/2023] Open
Abstract
We previously described diaryl trifluorothiazoline compound 1a (hereafter referred to as fluorizoline) as a first-in-class small molecule that induces p53-independent apoptosis in a wide range of tumor cell lines. Fluorizoline directly binds to prohibitin 1 and 2 (PHBs), two proteins involved in the regulation of several cellular processes, including apoptosis. Here we demonstrate that fluorizoline-induced apoptosis is mediated by PHBs, as cells depleted of these proteins are highly resistant to fluorizoline treatment. In addition, BAX and BAK are necessary for fluorizoline-induced cytotoxic effects, thereby proving that apoptosis occurs through the intrinsic pathway. Expression analysis revealed that fluorizoline induced the upregulation of Noxa and Bim mRNA levels, which was not observed in PHB-depleted MEFs. Finally, Noxa−/−/Bim−/− MEFs and NOXA-downregulated HeLa cells were resistant to fluorizoline-induced apoptosis. All together, these findings show that fluorizoline requires PHBs to execute the mitochondrial apoptotic pathway.
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Affiliation(s)
- Cristina Moncunill-Massaguer
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - José Saura-Esteller
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Alba Pérez-Perarnau
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Claudia Mariela Palmeri
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Sonia Núñez-Vázquez
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Ana M Cosialls
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Diana M González-Gironès
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Helena Pomares
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Anne Korwitz
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Sara Preciado
- Barcelona Science Park and CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona, Spain
| | - Fernando Albericio
- Barcelona Science Park and CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona, Spain.,Institute for Research in Biomedicine Barcelona, Barcelona, Spain.,Department of Organic Chemistry, University of Barcelona, Barcelona, Spain
| | - Rodolfo Lavilla
- Barcelona Science Park and CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona, Spain.,Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, Barcelona, Spain
| | - Gabriel Pons
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Thomas Langer
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Daniel Iglesias-Serret
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
| | - Joan Gil
- Departament de Ciències Fisiològiques II, Universitat de Barcelona-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Catalunya, Spain
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Abstract
Human eukaryotic prohibitin (prohibitin-1 and prohibitin-2) is a membrane protein with different cellular localizations. It is involved in multiple cellular functions, including energy metabolism, proliferation, apoptosis, and senescence. The subcellular localization of prohibitin may determine its functions. Membrane prohibitin regulate the cellular signaling of membrane transport, nuclear prohibitin control transcription activation and the cell cycle, and mitochondrial prohibitin complex stabilize the mitochondrial genome and modulate mitochondrial dynamics, mitochondrial morphology, mitochondrial biogenesis, and the mitochondrial intrinsic apoptotic pathway. Moreover, prohibitin can translocates into the nucleus or the mitochondria under apoptotic signals and the subcellular shuttling of prohibitin is necessary for apoptosis process. Apoptosis is the process of programmed cell death that is important for the maintenance of normal physiological functions. Consequently, any alteration in the content, post-transcriptional modification (i.e. phosphorylation) or the nuclear or mitochondrial translocation of prohibitin may influence cell fate. Understanding the mechanisms of the expression and regulation of prohibitin may be useful for future research. This review provides an overview of the multifaceted and essential roles played by prohibitin in the regulation of cell survival and apoptosis.
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Affiliation(s)
- Ya-Ting Peng
- Department of Respiratory Medicine, Respiratory Disease Research Institute, Second XiangYa Hospital of Central South University, Changsha, 410011, People's Republic of China
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Flavaglines Ameliorate Experimental Colitis and Protect Against Intestinal Epithelial Cell Apoptosis and Mitochondrial Dysfunction. Inflamm Bowel Dis 2016; 22:55-67. [PMID: 26398710 PMCID: PMC5600465 DOI: 10.1097/mib.0000000000000592] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND Flavaglines are a family of natural compounds shown to have anti-inflammatory and cytoprotective effects in neurons and cardiomyocytes. Flavaglines target prohibitins as ligands, which are scaffold proteins that regulate mitochondrial function, cell survival, and transcription. This study tested the therapeutic potential of flavaglines to promote intestinal epithelial cell homeostasis and to protect against a model of experimental colitis in which inflammation is driven by epithelial ulceration. METHODS Survival and homeostasis of Caco2-BBE and IEC-6 intestinal epithelial cell lines were measured during treatment with the flavaglines FL3 or FL37 alone and in combination with the proinflammatory cytokines tumor necrosis factor (TNF) α and interferon γ. Wild-type mice were intraperitoneally injected with 0.1 mg/kg FL3 or vehicle once daily for 4 days during dextran sodium sulfate-induced colitis to test the in vivo anti-inflammatory effect of FL3. RESULTS FL3 and FL37 increased basal Caco2-BBE and IEC-6 cell viability, decreased apoptosis, and decreased epithelial monolayer permeability. FL3 and FL37 inhibited TNFα- and interferon γ-induced nuclear factor kappa B and Cox2 expression, apoptosis, and increased permeability in Caco2-BBE cells. FL3 and FL37 protected against TNFα-induced mitochondrial superoxide generation by preserving respiratory chain complex I activity and prohibitin expression. p38-MAPK activation was essential for the protective effect of FL3 and FL37 on barrier permeability and mitochondrial-derived reactive oxygen species production during TNFα treatment. Mice administered FL3 during dextran sodium sulfate colitis exhibited increased colonic prohibitin expression and p38-MAPK activation, preserved barrier function, and less inflammation. CONCLUSIONS These results suggest that flavaglines exhibit therapeutic potential against colitis and preserve intestinal epithelial cell survival, mitochondrial function, and barrier integrity.
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Functional diversity of complex I subunits in Candida albicans mitochondria. Curr Genet 2015; 62:87-95. [PMID: 26373419 DOI: 10.1007/s00294-015-0518-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 08/26/2015] [Accepted: 08/28/2015] [Indexed: 10/23/2022]
Abstract
Our interest in the mitochondria of Candida albicans has progressed to the identification of several proteins that are critical to complex I (CI) activity. We speculated that there should be major functional differences at the protein level between mammalian and fungal mitochondria CI. In our pursuit of this idea, we were helped by published data of CI subunit proteins from a broad diversity of species that included two subunit proteins that are not found in mammals. These subunit proteins have been designated as Nuo1p and Nuo2p (NADH-ubiquinone oxidoreductases). Since functional assignments of both C. albicans proteins were unknown, other than having a putative NADH-oxidoreductase activity, we constructed knock-out strains that could be compared to parental cells. The relevance of our research relates to the critical roles of both proteins in cell biology and pathogenesis and their absence in mammals. These features suggest they may be exploited in antifungal drug discovery. Initially, we characterized Goa1p that apparently regulates CI activity but is not a CI subunit protein. We have used the goa1∆ for comparisons to Nuo1p and Nuo2p. We have demonstrated the critical role of these proteins in maintaining CI activities, virulence, and prolonging life span. More recently, transcriptional profiling of the three mutants and an ndh51∆ (protein is a highly conserved CI subunit) has revealed that there are overlapping yet also different functional assignments that suggest subunit specificity. The differences and similarities of each are described below along with our hypotheses to explain these data. Our conclusion and perspective is that the C. albicans CI subunit proteins are highly conserved except for two that define non-mammalian functions.
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Stewart JB, Alaei-Mahabadi B, Sabarinathan R, Samuelsson T, Gorodkin J, Gustafsson CM, Larsson E. Simultaneous DNA and RNA Mapping of Somatic Mitochondrial Mutations across Diverse Human Cancers. PLoS Genet 2015; 11:e1005333. [PMID: 26125550 PMCID: PMC4488357 DOI: 10.1371/journal.pgen.1005333] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 06/03/2015] [Indexed: 12/30/2022] Open
Abstract
Somatic mutations in the nuclear genome are required for tumor formation, but the functional consequences of somatic mitochondrial DNA (mtDNA) mutations are less understood. Here we identify somatic mtDNA mutations across 527 tumors and 14 cancer types, using an approach that takes advantage of evidence from both genomic and transcriptomic sequencing. We find that there is selective pressure against deleterious coding mutations, supporting that functional mitochondria are required in tumor cells, and also observe a strong mutational strand bias, compatible with endogenous replication-coupled errors as the major source of mutations. Interestingly, while allelic ratios in general were consistent in RNA compared to DNA, some mutations in tRNAs displayed strong allelic imbalances caused by accumulation of unprocessed tRNA precursors. The effect was explained by altered secondary structure, demonstrating that correct tRNA folding is a major determinant for processing of polycistronic mitochondrial transcripts. Additionally, the data suggest that tRNA clusters are preferably processed in the 3′ to 5′ direction. Our study gives insights into mtDNA function in cancer and answers questions regarding mitochondrial tRNA biogenesis that are difficult to address in controlled experimental systems. According to the so-called “tRNA punctuation model”, tRNA processing is key to generating all mature mitochondrial mRNAs. However, the process is difficult to study in vivo, since standard tools for genetic manipulation are not applicable to mitochondria. Here, we circumvent this problem by using a large compendium of naturally occurring genetic perturbations, derived from human tumor sequencing data. We identify somatic mitochondrial mutations across hundreds of human tumors using an approach that simultaneously takes advantage of both genomic and transcriptomic sequencing. This enables us to compare the allele frequency in DNA and RNA for each mutation. Our data reveals that some mutations in mitochondrial tRNAs are associated with strong accumulation of immature tRNA precursors, indicative of impaired tRNA mutaration. We find that intact tRNA secondary structure is a major requirement for correct maturation, and that mutations affecting tRNA folding can impair maturation of not only the affected tRNA, but also neighboring gene transcripts. Mutations in mitochondrial tRNAs underlie a range of disease conditions, and our findings may help to explain why mutations in the same tRNA can present different phenotypes. Our results additionally support that there is selective pressure against mutations affecting oxidative phosphorylation, showing that functional mitochondria are required in many tumor cells.
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Affiliation(s)
| | - Babak Alaei-Mahabadi
- Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Radhakrishnan Sabarinathan
- Center for non-coding RNA in Technology and Health, IKVH, University of Copenhagen, Frederiksberg, Denmark
| | - Tore Samuelsson
- Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Jan Gorodkin
- Center for non-coding RNA in Technology and Health, IKVH, University of Copenhagen, Frederiksberg, Denmark
| | - Claes M. Gustafsson
- Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Erik Larsson
- Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- * E-mail:
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Piechota J, Bereza M, Sokołowska A, Suszyński K, Lech K, Jańska H. Unraveling the functions of type II-prohibitins in Arabidopsis mitochondria. PLANT MOLECULAR BIOLOGY 2015; 88:249-267. [PMID: 25896400 DOI: 10.1007/s11103-015-0320-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 04/07/2015] [Indexed: 06/04/2023]
Abstract
In yeast and mammals, prohibitins (PHBs) are considered as structural proteins that form a scaffold-like structure for interacting with a set of proteins involved in various processes occurring in the mitochondria. The role of PHB in plant mitochondria is poorly understood. In the study, the model organism Arabidopsis thaliana was used to identify the possible roles of type-II PHBs (homologs of yeast Phb2p) in plant mitochondria. The obtained results suggest that the plant PHB complex participates in the assembly of multisubunit complexes; namely, respiratory complex I and enzymatic complexes carrying lipoic acid as a cofactor (pyruvate dehydrogenase, 2-oxoglutarate dehydrogenase and glycine decarboxylase). PHBs physically interact with subunits of these complexes. Knockout of two Arabidopsis type-II prohibitins (AtPHB2 and AtPHB6) results in a decreased abundance of these complexes along with a reduction in mitochondrial acyl carrier proteins. Also, the absence of AtPHB2 and AtPHB6 influences the expression of the mitochondrial genome and leads to the activation of alternative respiratory pathways, namely alternative oxidase and external NADH-dependent alternative dehydrogenases.
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Affiliation(s)
- Janusz Piechota
- Department of Biotechnology, University of Wroclaw, F. Juliot-Curie 14a, 50-383, Wroclaw, Poland,
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Assembly defects induce oxidative stress in inherited mitochondrial complex I deficiency. Int J Biochem Cell Biol 2015; 65:91-103. [PMID: 26024641 DOI: 10.1016/j.biocel.2015.05.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 04/11/2015] [Accepted: 05/15/2015] [Indexed: 12/11/2022]
Abstract
Complex I (CI) deficiency is the most common respiratory chain defect representing more than 30% of mitochondrial diseases. CI is an L-shaped multi-subunit complex with a peripheral arm protruding into the mitochondrial matrix and a membrane arm. CI sequentially assembled into main assembly intermediates: the P (pumping), Q (Quinone) and N (NADH dehydrogenase) modules. In this study, we analyzed 11 fibroblast cell lines derived from patients with inherited CI deficiency resulting from mutations in the nuclear or mitochondrial DNA and impacting these different modules. In patient cells carrying a mutation located in the matrix arm of CI, blue native-polyacrylamide gel electrophoresis (BN-PAGE) revealed a significant reduction of fully assembled CI enzyme and an accumulation of intermediates of the N module. In these cell lines with an assembly defect, NADH dehydrogenase activity was partly functional, even though CI was not fully assembled. We further demonstrated that this functional N module was responsible for ROS production through the reduced flavin mononucleotide. Due to the assembly defect, the FMN site was not re-oxidized leading to a significant oxidative stress in cell lines with an assembly defect. These findings not only highlight the relationship between CI assembly and oxidative stress, but also show the suitability of BN-PAGE analysis in evaluating the consequences of CI dysfunction. Moreover, these data suggest that the use of antioxidants may be particularly relevant for patients displaying a CI assembly defect.
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Vartak R, Deng J, Fang H, Bai Y. Redefining the roles of mitochondrial DNA-encoded subunits in respiratory Complex I assembly. Biochim Biophys Acta Mol Basis Dis 2015; 1852:1531-9. [PMID: 25887158 DOI: 10.1016/j.bbadis.2015.04.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 04/01/2015] [Accepted: 04/07/2015] [Indexed: 02/03/2023]
Abstract
Respiratory Complex I deficiency is implicated in numerous degenerative and metabolic diseases. In particular, mutations in several mitochondrial DNA (mtDNA)-encoded Complex I subunits including ND4, ND5 and ND6 have been identified in several neurological diseases. We previously demonstrated that these subunits played essential roles in Complex I assembly which in turn affected mitochondrial function. Here, we carried out a comprehensive study of the Complex I assembly pathway. We identified a new Complex I intermediate containing both membrane and matrix arms at an early assembly stage. We find that lack of the ND6 subunit does not hinder membrane arm formation; instead it recruits ND1 and ND5 enters the intermediate. While ND4 is important for the formation of the newly identified intermediate, the addition of ND5 stabilizes the complex and is required for the critical transition from Complex I to supercomplex assembly. As a result, the Complex I assembly pathway has been redefined in this study.
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Affiliation(s)
- Rasika Vartak
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Janice Deng
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Hezhi Fang
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Yidong Bai
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
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Li T, Wang Y, Gao Y, Li Q. Identification and characterisation of the anti-oxidative stress properties of the lamprey prohibitin 2 gene. FISH & SHELLFISH IMMUNOLOGY 2015; 42:447-456. [PMID: 25463290 DOI: 10.1016/j.fsi.2014.11.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 11/13/2014] [Accepted: 11/17/2014] [Indexed: 06/04/2023]
Abstract
The highly conserved protein prohibitin 2 (PHB2) has been implicated as a cell-surface receptor in the regulation of proliferation, apoptosis, transcription, and mitochondrial protein folding. In the present study, we identified a Lampetra morii homologue of PHB2, Lm-PHB2, showing greater than 61.8% sequence identity with its homologues. Phylogenetic analysis indicated that the position of Lm-PHB2 is consistent with lamprey phylogeny. Expression of the Lm-PHB2 protein was nearly equivalent in the heart, liver, kidneys, intestines, and muscles of normal lampreys. However, the Lm-PHB2 protein was down-regulated in the myocardia of lampreys challenged for 5 days with adriamycin (Adr), followed by a significant up-regulation 10 days after treatment. In vitro, recombinant Lm-PHB2 (rLm-PHB2) protein could significantly enhance the H2O2-induced oxidative stress tolerance in Chang liver (CHL) cells. Further mechanism studies indicated that the nucleus-to-mitochondria translocation of Lm-PHB2 was closely involved in the oxidative stress protection. Our results suggests that the strategies to modulate Lm-PHB2 levels may constitute a novel therapeutic approach for myocardial injury and liver inflammatory diseases, conditions in which oxidative stress plays a critical role in tissue injury and inflammation.
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Affiliation(s)
- Tiesong Li
- Life Science College of Liaoning Normal University, Dalian 116029, China; Lamprey Research Centre, Liaoning Normal University, Dalian 116029, China.
| | - Ying Wang
- Life Science College of Liaoning Normal University, Dalian 116029, China; Lamprey Research Centre, Liaoning Normal University, Dalian 116029, China
| | - Yang Gao
- Life Science College of Liaoning Normal University, Dalian 116029, China; Lamprey Research Centre, Liaoning Normal University, Dalian 116029, China
| | - Qingwei Li
- Life Science College of Liaoning Normal University, Dalian 116029, China; Lamprey Research Centre, Liaoning Normal University, Dalian 116029, China.
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Zheng H, Lu GM. Reduction of prohibitin expression contributes to left ventricular hypertrophy via enhancement of mitochondrial reactive oxygen species formation in spontaneous hypertensive rats. Free Radic Res 2014; 49:164-74. [PMID: 25465279 DOI: 10.3109/10715762.2014.991724] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Left ventricular hypertrophy (LVH) in hypertension is characterized by thickening of myocardium and decrease in heart chamber volume in response to mechanical or pathological stress, but the underlying molecular mechanisms remain to be defined. In this work, we investigate whether mitochondrial prohibitin (PHB) was involved in the progression of LVH in spontaneous hypertensive rats (SHR). First, it was found that mitochondrial dysfunction occurred in left ventricles of SHR. Through analysis using quantitative reverse transcription polymerase chain reaction and Western blotting, it was found that PHB mRNA and mitochondrial PHB levels in left ventricles of SHR were significantly lower than that in Wistar-Kyoto rats. Furthermore, PHB mRNA levels were negatively correlated to left ventricles weight-to-body weight ratio in SHR. Knockdown of PHB led to increased formation of mitochondrial reactive oxygen species (ROS) and reduced activities of complex I, mitochondrial adenosine triphosphate generation and mitochondrial membrane potential in cultured cardiomyocytes. Knockdown of PHB contributed to the cardiomyocyte hypertrophy, which could be attenuated by treatment with the Tempol. Angiotensin II (AngII) was increased in plasma and left ventricles of SHR. Incubation with AngII reduced mitochondrial PHB expression in cardiomyocytes, which was reversed when pretreated with losartan. In conclusion, reduction of PHB expression in left ventricles in SHR contributed to LVH, at least in part, through promoting mitochondrial ROS formation.
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Affiliation(s)
- H Zheng
- College of Chemistry and Biology, Donghua University , Shanghai , P. R. China
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Vartak RS, Semwal MK, Bai Y. An update on complex I assembly: the assembly of players. J Bioenerg Biomembr 2014; 46:323-8. [PMID: 25030182 DOI: 10.1007/s10863-014-9564-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 07/02/2014] [Indexed: 12/19/2022]
Abstract
Defects in Complex I assembly is one of the emerging underlying causes of severe mitochondrial disorders. The assembly of Complex I has been difficult to understand due to its large size, dual genetic control and the number of proteins involved. Mutations in Complex I subunits as well as assembly factors have been reported to hinder its assembly and give rise to a range of mitochondria disorders. In this review, we summarize the recent progress made in understanding the Complex I assembly pathway. In particularly, we focus on the known as well as novel assembly factors and their role in assembly of Complex I and human disease.
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Affiliation(s)
- Rasika S Vartak
- Department of Cellular and Structural Biology, UT Health Science Center, San Antonio, TX, USA
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45
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Han J, Yu C, Souza RF, Theiss AL. Prohibitin 1 modulates mitochondrial function of Stat3. Cell Signal 2014; 26:2086-95. [PMID: 24975845 DOI: 10.1016/j.cellsig.2014.06.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 06/19/2014] [Indexed: 02/08/2023]
Abstract
Mitochondrial dysfunction in intestinal epithelial cells (IEC) is thought to precede the onset of inflammatory bowel diseases (IBD). Expression of Prohibitin 1 (PHB), a mitochondrial protein required for optimal electron transport chain (ETC) activity, is decreased in mucosal biopsies during active and inactive IBD. In addition to its activities as a transcription factor, Signal Transducer and Activator of Transcription 3 (Stat3) resides in the mitochondria of cells where phosphorylation at S727 is required for optimal ETC activity and protects against stress-induced mitochondrial dysfunction. Here, we show that PHB overexpression protects against mitochondrial stress and apoptosis of cultured IECs induced by TNFα, which is a pro-inflammatory cytokine involved in IBD pathogenesis. Expression of pS727-Stat3 dominant negative eliminates protection by PHB against TNFα-induced mitochondrial stress and apoptosis. PHB interacts with pS727-Stat3 in the mitochondria of cultured IECs and in colonic epithelium from wild-type mice. Our data suggest a protective role of PHB that is dependent on pS727-Stat3 to prevent mitochondrial dysfunction in IECs. Reduced levels of PHB during IBD may be an underlying factor promoting mitochondrial dysfunction of the intestinal epithelium.
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Affiliation(s)
- Jie Han
- Department of Internal Medicine, Division of Gastroenterology, Baylor Research Institute, Baylor University Medical Center, Dallas, TX, United States
| | - Chunhua Yu
- Department of Medicine, Veterans Affairs North Texas Health Care System, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Rhonda F Souza
- Department of Medicine, Veterans Affairs North Texas Health Care System, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Arianne L Theiss
- Department of Internal Medicine, Division of Gastroenterology, Baylor Research Institute, Baylor University Medical Center, Dallas, TX, United States.
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Disruption of interleukin-1β autocrine signaling rescues complex I activity and improves ROS levels in immortalized epithelial cells with impaired cystic fibrosis transmembrane conductance regulator (CFTR) function. PLoS One 2014; 9:e99257. [PMID: 24901709 PMCID: PMC4047112 DOI: 10.1371/journal.pone.0099257] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 05/13/2014] [Indexed: 12/22/2022] Open
Abstract
Patients with cystic fibrosis (CF) have elevated concentration of cytokines in sputum and a general inflammatory condition. In addition, CF cells in culture produce diverse cytokines in excess, including IL-1β. We have previously shown that IL-1β, at low doses (∼30 pM), can stimulate the expression of CFTR in T84 colon carcinoma cells, through NF-κB signaling. However, at higher doses (>2.5 ng/ml, ∼150 pM), IL-1β inhibit CFTR mRNA expression. On the other hand, by using differential display, we found two genes with reduced expression in CF cells, corresponding to the mitochondrial proteins CISD1 and MTND4. The last is a key subunit for the activity of mitochondrial Complex I (mCx-I); accordingly, we later found a reduced mCx-I activity in CF cells. Here we found that IB3-1 cells (CF cells), cultured in serum-free media, secrete 323±5 pg/ml of IL-1β in 24 h vs 127±3 pg/ml for S9 cells (CFTR-corrected IB3-1 cells). Externally added IL-1β (5 ng/ml) reduces the mCx-I activity and increases the mitochondrial (MitoSOX probe) and cellular (DCFH-DA probe) ROS levels of S9 (CFTR-corrected IB3-1 CF cells) or Caco-2/pRSctrl cells (shRNA control cells) to values comparable to those of IB3-1 or Caco-2/pRS26 cells (shRNA specific for CFTR). Treatments of IB3-1 or Caco-2/pRS26 cells with either IL-1β blocking antibody, IL-1 receptor antagonist, IKK inhibitor III (NF-κB pathway) or SB203580 (p38 MAPK pathway), restored the mCx-I activity. In addition, in IB3-1 or Caco-2/pRS26 cells, IL-1β blocking antibody, IKK inhibitor III or SB203580 reduced the mitochondrial ROS levels by ∼50% and the cellular ROS levels near to basal values. The AP-1 inhibitors U0126 (MEK1/2) or SP600125 (JNK1/2/3 inhibitor) had no effects. The results suggest that in these cells IL-1β, through an autocrine effect, acts as a bridge connecting the CFTR with the mCx-I activity and the ROS levels.
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Gehl B, Sweetlove LJ. Mitochondrial Band-7 family proteins: scaffolds for respiratory chain assembly? FRONTIERS IN PLANT SCIENCE 2014; 5:141. [PMID: 24782879 PMCID: PMC3986555 DOI: 10.3389/fpls.2014.00141] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 03/24/2014] [Indexed: 05/28/2023]
Abstract
The band-7 protein family comprises a diverse set of membrane-bound proteins characterized by the presence of a conserved domain. The exact function of this band-7 domain remains elusive, but examples from animal and bacterial stomatin-type proteins demonstrate binding to lipids and the ability to assemble into membrane-bound oligomers that form putative scaffolds. Some members, such as prohibitins (PHB) and human stomatin-like protein 2 (HsSLP2), localize to the mitochondrial inner membrane where they function in cristae formation and hyperfusion. In Arabidopsis, the band-7 protein family has diversified and includes plant-specific members. Mitochondrial-localized members include prohibitins (AtPHBs) and two stomatin-like proteins (AtSLP1 and -2). Studies into PHB function in plants have demonstrated an involvement in root meristem proliferation and putative scaffold formation for mAAA proteases, but it remains unknown how these roles are achieved at the molecular level. In this minireview we summarize the current status of band-7 protein functions in Arabidopsis, and speculate how the mitochondrial members might recruit specific lipids to form microdomains that could shape the organization and functioning of the respiratory chain.
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Affiliation(s)
| | - Lee J. Sweetlove
- *Correspondence: Lee J. Sweetlove, Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK e-mail:
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Thuaud F, Ribeiro N, Nebigil CG, Désaubry L. Prohibitin ligands in cell death and survival: mode of action and therapeutic potential. ACTA ACUST UNITED AC 2013; 20:316-31. [PMID: 23521790 PMCID: PMC7111013 DOI: 10.1016/j.chembiol.2013.02.006] [Citation(s) in RCA: 157] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 01/31/2013] [Accepted: 02/06/2013] [Indexed: 12/21/2022]
Abstract
Prohibitins (PHBs) are scaffold proteins that modulate many signaling pathways controlling cell survival, metabolism, and inflammation. Several drugs that target PHBs have been identified and evaluated for various clinical applications. Preclinical and clinical studies indicate that these PHB ligands may be useful in oncology, cardiology, and neurology, as well as against obesity. This review covers the physiological role of PHBs in health and diseases and current developments concerning PHB ligands.
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Affiliation(s)
- Frédéric Thuaud
- Therapeutic Innovation Laboratory UMR 7200, CNRS/Université de Strasbourg, Faculté de Pharmacie, 67401 Illkirch Cedex, France
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Valdivieso AG, Santa-Coloma TA. CFTR activity and mitochondrial function. Redox Biol 2013; 1:190-202. [PMID: 24024153 PMCID: PMC3757715 DOI: 10.1016/j.redox.2012.11.007] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 11/12/2012] [Indexed: 12/21/2022] Open
Abstract
Cystic Fibrosis (CF) is a frequent and lethal autosomal recessive disease, caused by mutations in the gene encoding the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR). Before the discovery of the CFTR gene, several hypotheses attempted to explain the etiology of this disease, including the possible role of a chloride channel, diverse alterations in mitochondrial functions, the overexpression of the lysosomal enzyme α-glucosidase and a deficiency in the cytosolic enzyme glucose 6-phosphate dehydrogenase. Because of the diverse mitochondrial changes found, some authors proposed that the affected gene should codify for a mitochondrial protein. Later, the CFTR cloning and the demonstration of its chloride channel activity turned the mitochondrial, lysosomal and cytosolic hypotheses obsolete. However, in recent years, using new approaches, several investigators reported similar or new alterations of mitochondrial functions in Cystic Fibrosis, thus rediscovering a possible role of mitochondria in this disease. Here, we review these CFTR-driven mitochondrial defects, including differential gene expression, alterations in oxidative phosphorylation, calcium homeostasis, oxidative stress, apoptosis and innate immune response, which might explain some characteristics of the complex CF phenotype and reveals potential new targets for therapy.
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Affiliation(s)
- Angel Gabriel Valdivieso
- Institute for Biomedical Research (BIOMED CONICET-UCA), Laboratory of Cellular and Molecular Biology, School of Medical Sciences, Pontifical Catholic University of Argentina (UCA), Buenos Aires, Argentina
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Ivanov AV, Bartosch B, Smirnova OA, Isaguliants MG, Kochetkov SN. HCV and oxidative stress in the liver. Viruses 2013; 5:439-69. [PMID: 23358390 PMCID: PMC3640510 DOI: 10.3390/v5020439] [Citation(s) in RCA: 148] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 12/26/2012] [Accepted: 01/17/2013] [Indexed: 12/12/2022] Open
Abstract
Hepatitis C virus (HCV) is the etiological agent accounting for chronic liver disease in approximately 2-3% of the population worldwide. HCV infection often leads to liver fibrosis and cirrhosis, various metabolic alterations including steatosis, insulin and interferon resistance or iron overload, and development of hepatocellular carcinoma or non-Hodgkin lymphoma. Multiple molecular mechanisms that trigger the emergence and development of each of these pathogenic processes have been identified so far. One of these involves marked induction of a reactive oxygen species (ROS) in infected cells leading to oxidative stress. To date, markers of oxidative stress were observed both in chronic hepatitis C patients and in various in vitro systems, including replicons or stable cell lines expressing viral proteins. The search for ROS sources in HCV-infected cells revealed several mechanisms of ROS production and thus a number of cellular proteins have become targets for future studies. Furthermore, during last several years it has been shown that HCV modifies antioxidant defense mechanisms. The aim of this review is to summarize the present state of art in the field and to try to predict directions for future studies.
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Affiliation(s)
- Alexander V. Ivanov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str., 32, Moscow 119991, Russia; E-Mails: (A.I.); (O.S.); (S.K.)
| | - Birke Bartosch
- CRCL, INSERM U1052, CNRS 5286, Université de Lyon, 151, Cours A Thomas 69424 Lyon Cedex France; E-Mail:
| | - Olga A. Smirnova
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str., 32, Moscow 119991, Russia; E-Mails: (A.I.); (O.S.); (S.K.)
| | - Maria G. Isaguliants
- Department of Molecular Biology, Tumor and Cell Biology, Karolinska Institutet, Nobels väg 16 17177 Stockholm, Sweden; E-Mail:
- D.I. Ivanovsky Institute of Virology, Gamaleya Str. 16, 123098 Moscow, Russia; E-Mail:
| | - Sergey N. Kochetkov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str., 32, Moscow 119991, Russia; E-Mails: (A.I.); (O.S.); (S.K.)
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