1
|
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. MicroPubl Biol 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] [What about the content of this article? (0)] [Affiliation(s)] [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.
Collapse
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 (
)
| |
Collapse
|
2
|
Byrne JJ, Soh MS, Chandhok G, Vijayaraghavan T, Teoh JS, Crawford S, Cobham AE, Yapa NMB, Mirth CK, Neumann B. Disruption of mitochondrial dynamics affects behaviour and lifespan in Caenorhabditis elegans. Cell Mol Life Sci 2019; 76:1967-1985. [PMID: 30840087 PMCID: PMC6478650 DOI: 10.1007/s00018-019-03024-5] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 01/11/2019] [Accepted: 01/22/2019] [Indexed: 01/29/2023]
Abstract
Mitochondria are essential components of eukaryotic cells, carrying out critical physiological processes that include energy production and calcium buffering. Consequently, mitochondrial dysfunction is associated with a range of human diseases. Fundamental to their function is the ability to transition through fission and fusion states, which is regulated by several GTPases. Here, we have developed new methods for the non-subjective quantification of mitochondrial morphology in muscle and neuronal cells of Caenorhabditis elegans. Using these techniques, we uncover surprising tissue-specific differences in mitochondrial morphology when fusion or fission proteins are absent. From ultrastructural analysis, we reveal a novel role for the fusion protein FZO-1/mitofusin 2 in regulating the structure of the inner mitochondrial membrane. Moreover, we have determined the influence of the individual mitochondrial fission (DRP-1/DRP1) and fusion (FZO-1/mitofusin 1,2; EAT-3/OPA1) proteins on animal behaviour and lifespan. We show that loss of these mitochondrial fusion or fission regulators induced age-dependent and progressive deficits in animal movement, as well as in muscle and neuronal function. Our results reveal that disruption of fusion induces more profound defects than lack of fission on animal behaviour and tissue function, and imply that while fusion is required throughout life, fission is more important later in life likely to combat ageing-associated stressors. Furthermore, our data demonstrate that mitochondrial function is not strictly dependent on morphology, with no correlation found between morphological changes and behavioural defects. Surprisingly, we find that disruption of either mitochondrial fission or fusion significantly reduces median lifespan, but maximal lifespan is unchanged, demonstrating that mitochondrial dynamics play an important role in limiting variance in longevity across isogenic populations. Overall, our study provides important new insights into the central role of mitochondrial dynamics in maintaining organismal health.
Collapse
Affiliation(s)
- Joseph J Byrne
- Neuroscience Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia
| | - Ming S Soh
- Neuroscience Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia
| | - Gursimran Chandhok
- Neuroscience Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia
| | - Tarika Vijayaraghavan
- Neuroscience Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia
| | - Jean-Sébastien Teoh
- Neuroscience Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia
| | - Simon Crawford
- Monash Ramaciotti Centre for Cryo-Electron Microscopy, Monash University, Melbourne, VIC, 3800, Australia
| | - Ansa E Cobham
- School of Biological Sciences, Monash University, Melbourne, VIC, 3800, Australia
| | - Nethmi M B Yapa
- Neuroscience Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia
| | - Christen K Mirth
- School of Biological Sciences, Monash University, Melbourne, VIC, 3800, Australia
| | - Brent Neumann
- Neuroscience Program, Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental Biology, Monash University, Melbourne, VIC, 3800, Australia.
| |
Collapse
|
3
|
Guttmann S, Chandhok G, Groba SR, Niemietz C, Sauer V, Gomes A, Ciarimboli G, Karst U, Zibert A, Schmidt HH. Organic cation transporter 3 mediates cisplatin and copper cross-resistance in hepatoma cells. Oncotarget 2017; 9:743-754. [PMID: 29416650 PMCID: PMC5787505 DOI: 10.18632/oncotarget.23142] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 11/15/2017] [Indexed: 12/12/2022] Open
Abstract
Platinum-based drugs are first-line compounds in the treatment of many solid cancers. Major obstacles are tumors that become resistant and toxic side effects, both largely due to the expression of transporters that mediate the cellular processing of platinum. In this study, we addressed the establishment of cisplatin resistance in the absence of copper transporter ATP7B that has been previously found to be overexpressed in various resistant cells. Cisplatin sensitivity, induction of apoptosis, drug accumulation, and transporter gene expression were determined in hepatoma cell lines. Knockout or overexpression of copper transporter ATP7B did not affect cisplatin sensitivity. Cisplatin resistant cells showed a stably reduced cisplatin accumulation and a downregulation of organic cation transporter 3 (OCT3). In contrast, OCT3 overexpression could reverse resistance. Reduced MT1 expression was detected in the resistant cell line, however transient and highly dependent on the presence of cisplatin. Cross-resistance to copper was also associated with OCT3 downregulation. Our results suggest that a decreased level of OCT3 expression results in resistance to cisplatin and copper. OCT3 may represent a novel target for improved prognosis and anticancer therapy, including HCC.
Collapse
Affiliation(s)
- Sarah Guttmann
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany
| | - Gursimran Chandhok
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany.,Present address: Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, Victoria, Australia
| | - Sara Reinartz Groba
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany
| | - Christoph Niemietz
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany
| | - Vanessa Sauer
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany
| | - Amanda Gomes
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany.,Present address: Wilson Disease Clinic, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India
| | - Giuliano Ciarimboli
- Universitätsklinikum Münster, Medizinische Klinik D, Experimentelle Nephrologie, Münster, Germany
| | - Uwe Karst
- Institute of Inorganic and Analytical Chemistry, University of Münster, Münster, Germany
| | - Andree Zibert
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany
| | - Hartmut H Schmidt
- Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany
| |
Collapse
|
4
|
Chandhok G, Lazarou M, Neumann B. Structure, function, and regulation of mitofusin-2 in health and disease. Biol Rev Camb Philos Soc 2017; 93:933-949. [PMID: 29068134 PMCID: PMC6446723 DOI: 10.1111/brv.12378] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 09/20/2017] [Accepted: 09/22/2017] [Indexed: 12/12/2022]
Abstract
Mitochondria are highly dynamic organelles that constantly migrate, fuse, and divide to regulate their shape, size, number, and bioenergetic function. Mitofusins (Mfn1/2), optic atrophy 1 (OPA1), and dynamin-related protein 1 (Drp1), are key regulators of mitochondrial fusion and fission. Mutations in these molecules are associated with severe neurodegenerative and non-neurological diseases pointing to the importance of functional mitochondrial dynamics in normal cell physiology. In recent years, significant progress has been made in our understanding of mitochondrial dynamics, which has raised interest in defining the physiological roles of key regulators of fusion and fission and led to the identification of additional functions of Mfn2 in mitochondrial metabolism, cell signalling, and apoptosis. In this review, we summarize the current knowledge of the structural and functional properties of Mfn2 as well as its regulation in different tissues, and also discuss the consequences of aberrant Mfn2 expression.
Collapse
Affiliation(s)
- Gursimran Chandhok
- Department of Anatomy and Developmental Biology, and Neuroscience Program, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Michael Lazarou
- Department of Biochemistry and Molecular Biology, and Neuroscience Program, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Brent Neumann
- Department of Anatomy and Developmental Biology, and Neuroscience Program, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| |
Collapse
|
5
|
Affiliation(s)
- Christoph Niemietz
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| | - Gursimran Chandhok
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| | - Lutz Fleischhauer
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| | - Paula Ballmaier
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| | - Vanessa Sauer
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| | - Sarah Guttmann
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| | - Andree Zibert
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| | - Hartmut Schmidt
- a Klinik für Transplantationsmedizin, Universitätsklinikum Münster , Münster , Germany
| |
Collapse
|
6
|
Verbandt S, Henriques ST, Spincemaille P, Harvey PJ, Chandhok G, Sauer V, De Coninck B, Cassiman D, Craik DJ, Cammue BPA, De Cremer K, Thevissen K. Identification of survival-promoting OSIP108 peptide variants and their internalization in human cells. Mech Ageing Dev 2016; 161:247-254. [PMID: 27491841 DOI: 10.1016/j.mad.2016.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 06/30/2016] [Accepted: 07/30/2016] [Indexed: 11/19/2022]
Abstract
The plant-derived decapeptide OSIP108 increases tolerance of yeast and human cells to apoptosis-inducing agents, such as copper and cisplatin. We performed a whole amino acid scan of OSIP108 and conducted structure-activity relationship studies on the induction of cisplatin tolerance (CT) in yeast. The use of cisplatin as apoptosis-inducing trigger in this study should be considered as a tool to better understand the survival-promoting nature of OSIP108 and not for purposes related to anti-cancer treatment. We found that charged residues (Arg, His, Lys, Glu or Asp) or a Pro on positions 4-7 improved OSIP108 activity by 10% or more. The variant OSIP108[G7P] induced the most pronounced tolerance to toxic concentrations of copper and cisplatin in yeast and/or HepG2 cells. Both OSIP108 and OSIP108[G7P] were shown to internalize equally into HeLa cells, but at a higher rate than the inactive OSIP108[E10A], suggesting that the peptides can internalize into cells and that OSIP108 activity is dependent on subsequent intracellular interactions. In conclusion, our studies demonstrated that tolerance/survival-promoting properties of OSIP108 can be significantly improved by single amino acid substitutions, and that these properties are dependent on (an) intracellular target(s), yet to be determined.
Collapse
Affiliation(s)
- Sara Verbandt
- Centre of Microbial and Plant Genetics, CMPG, KU Leuven, Kasteelpark Arenberg 20, box 2460, 3001 Leuven, Belgium
| | | | - Pieter Spincemaille
- Centre of Microbial and Plant Genetics, CMPG, KU Leuven, Kasteelpark Arenberg 20, box 2460, 3001 Leuven, Belgium; Department of Laboratory Medicine, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - Peta J Harvey
- Institute for Molecular Bioscience, University of Queensland, Brisbane, QLD 4072, Australia
| | - Gursimran Chandhok
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Vanessa Sauer
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Barbara De Coninck
- Centre of Microbial and Plant Genetics, CMPG, KU Leuven, Kasteelpark Arenberg 20, box 2460, 3001 Leuven, Belgium; Department of Plant Systems Biology, VIB, Technologiepark 927, 9052 Ghent, Belgium
| | - David Cassiman
- Department of Hepatology and Metabolic Center, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - David J Craik
- Institute for Molecular Bioscience, University of Queensland, Brisbane, QLD 4072, Australia
| | - Bruno P A Cammue
- Centre of Microbial and Plant Genetics, CMPG, KU Leuven, Kasteelpark Arenberg 20, box 2460, 3001 Leuven, Belgium; Department of Plant Systems Biology, VIB, Technologiepark 927, 9052 Ghent, Belgium.
| | - Kaat De Cremer
- Centre of Microbial and Plant Genetics, CMPG, KU Leuven, Kasteelpark Arenberg 20, box 2460, 3001 Leuven, Belgium; Department of Plant Systems Biology, VIB, Technologiepark 927, 9052 Ghent, Belgium
| | - Karin Thevissen
- Centre of Microbial and Plant Genetics, CMPG, KU Leuven, Kasteelpark Arenberg 20, box 2460, 3001 Leuven, Belgium
| |
Collapse
|
7
|
Chandhok G, Horvath J, Aggarwal A, Bhatt M, Zibert A, Schmidt HHJ. Functional analysis and drug response to zinc and D-penicillamine in stable ATP7B mutant hepatic cell lines. World J Gastroenterol 2016; 22:4109-4119. [PMID: 27122662 PMCID: PMC4837429 DOI: 10.3748/wjg.v22.i16.4109] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Revised: 01/24/2016] [Accepted: 02/22/2016] [Indexed: 02/06/2023] Open
Abstract
AIM: To study the effect of anti-copper treatment for survival of hepatic cells expressing different ATP7B mutations in cell culture.
METHODS: The most common Wilson disease (WD) mutations p.H1069Q, p.R778L and p.C271*, found in the ATP7B gene encoding a liver copper transporter, were studied. The mutations represent major genotypes of the United States and Europe, China, and India, respectively. A human hepatoma cell line previously established to carry a knockout of ATP7B was used to stably express WD mutants. mRNA and protein expression of mutant ATP7B, survival of cells, apoptosis, and protein trafficking were determined.
RESULTS: Low temperature increased ATP7B protein expression in several mutants. Intracellular ATP7B localization was significantly impaired in the mutants. Mutants were classified as high, moderate, and no survival based on their viability on exposure to toxic copper. Survival of mutant p.H1069Q and to a lesser extent p.C271* improved by D-penicillamine (DPA) treatment, while mutant p.R778L showed a pronounced response to zinc (Zn) treatment. Overall, DPA treatment resulted in higher cell survival as compared to Zn treatment; however, only combined Zn + DPA treatment fully restored cell viability.
CONCLUSION: The data indicate that the basic impact of a genotype might be characterized by analysis of mutant hepatic cell lines.
Collapse
|
8
|
Spincemaille P, Chandhok G, Zibert A, Schmidt H, Verbeek J, Chaltin P, Cammue BP, Cassiman D, Thevissen K. Angiotensin II type 1 receptor blockers increase tolerance of cells to copper and cisplatin. Microb Cell 2014; 1:352-364. [PMID: 28357214 PMCID: PMC5349125 DOI: 10.15698/mic2014.11.175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The human pathology Wilson disease (WD) is characterized by toxic copper (Cu)
accumulation in brain and liver, resulting in, among other indications,
mitochondrial dysfunction and apoptosis of hepatocytes. In an effort to identify
novel compounds that can alleviate Cu-induced toxicity, we screened the
Pharmakon 1600 repositioning library using a Cu-toxicity yeast screen. We
identified 2 members of the drug class of Angiotensin II Type 1 receptor
blockers (ARBs) that could increase yeast tolerance to Cu, namely Candesartan
and Losartan. Subsequently, we show that specific ARBs can increase yeast
tolerance to Cu and/or the chemotherapeutic agent cisplatin (Cp). The latter
also induces mitochondrial dysfunction and apoptosis in mammalian cells. We
further demonstrate that specific ARBs can prevent the prevalence of Cu-induced
apoptotic markers in yeast, with Candesartan Cilexetil being the ARB which
demonstrated most pronounced reduction of apoptosis-related markers. Next, we
tested the sensitivity of a selection of yeast knockout mutants affected in
detoxification of reactive oxygen species (ROS) and Cu for Candesartan Cilexetil
rescue in presence of Cu. These data indicate that Candesartan Cilexetil
increases yeast tolerance to Cu irrespectively of major ROS-detoxifying
proteins. Finally, we show that specific ARBs can increase mammalian cell
tolerance to Cu, as well as decrease the prevalence of Cu-induced apoptotic
markers. All the above point to the potential of ARBs in preventing Cu-induced
toxicity in yeast and mammalian cells.
Collapse
Affiliation(s)
- Pieter Spincemaille
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| | - Gursimran Chandhok
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Andree Zibert
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Hartmut Schmidt
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Jef Verbeek
- Department of Hepatology and Metabolic Center, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - Patrick Chaltin
- CISTIM Leuven vzw, Bio-Incubator 2, Wetenschapspark Arenberg, Gaston Geenslaan 2, 3001 Heverlee, Belgium. ; Centre for Drug Design and Discovery (CD3), KU Leuven R&D, Waaistraat 6, Box 5105, 3000 Leuven
| | - Bruno P Cammue
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium. ; Department of Plant Systems Biology, VIB, Technologiepark 927, 9052, Ghent, Belgium
| | - David Cassiman
- Department of Hepatology and Metabolic Center, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - Karin Thevissen
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| |
Collapse
|
9
|
Spincemaille P, Pham DH, Chandhok G, Verbeek J, Zibert A, Libbrecht L, Schmidt H, Esguerra CV, de Witte PA, Cammue BP, Cassiman D, Thevissen K. The plant decapeptide OSIP108 prevents copper-induced toxicity in various models for Wilson disease. Toxicol Appl Pharmacol 2014; 280:345-51. [DOI: 10.1016/j.taap.2014.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 07/30/2014] [Accepted: 08/05/2014] [Indexed: 02/07/2023]
|
10
|
Chandhok G, Schmitt N, Sauer V, Aggarwal A, Bhatt M, Schmidt HHJ. The effect of zinc and D-penicillamine in a stable human hepatoma ATP7B knockout cell line. PLoS One 2014; 9:e98809. [PMID: 24892424 PMCID: PMC4044041 DOI: 10.1371/journal.pone.0098809] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 05/07/2014] [Indexed: 12/27/2022] Open
Abstract
Mutations in the copper (Cu) transporter gene ATP7B, the primary cause of Wilson disease (WD), result in high liver Cu and death of hepatocytes. Cu chelators and zinc salts are the two most important drugs used in the treatment of WD patients; however, the molecular mechanisms of the drugs with regard to ATP7B expression have not been determined. A targeted knockout of ATP7B (KO) was established in the most widely used human hepatoma cell line, HepG2 for molecular studies of the pathogenesis and treatment of the disease. KO cells showed similar growth, Cu uptake, release, and gene expression as compared to parental cells. However, in the presence of Cu, morphological changes, oxidative stress, apoptosis, and loss of viability were observed. Induction of metallothionein (MT1X) after Cu exposure was significantly reduced in KO cells. Following zinc treatment, MT1X expression was strongly induced and a high percentage of KO cells could be rescued from Cu induced toxicity. D-penicillamine treatment had a minor effect on the viability of KO cells whereas the parental cell line showed a pronounced improvement. Combined treatment displayed a highly synergistic effect in KO cells. The data suggest that zinc has a previously unrecognized effect on the viability of hepatocytes that lack ATP7B due to a high induction of MT1X expression that compensates low gene expression after Cu exposure. A combination therapy that simultaneously targets at MT1X induction and Cu chelation improves the overall survival of hepatocytes for most efficient therapy of patients having WD.
Collapse
Affiliation(s)
- Gursimran Chandhok
- Clinic for Transplantation Medicine, Münster University Hospital, Münster, Germany
- Wilson Disease Clinic, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India
| | - Nadine Schmitt
- Clinic for Transplantation Medicine, Münster University Hospital, Münster, Germany
| | - Vanessa Sauer
- Clinic for Transplantation Medicine, Münster University Hospital, Münster, Germany
| | - Annu Aggarwal
- Wilson Disease Clinic, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India
| | - Mohit Bhatt
- Wilson Disease Clinic, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India
| | - Hartmut H. J. Schmidt
- Clinic for Transplantation Medicine, Münster University Hospital, Münster, Germany
- * E-mail:
| |
Collapse
|
11
|
Spincemaille P, Chandhok G, Newcomb B, Verbeek J, Vriens K, Zibert A, Schmidt H, Hannun YA, van Pelt J, Cassiman D, Cammue BPA, Thevissen K. The plant decapeptide OSIP108 prevents copper-induced apoptosis in yeast and human cells. Biochim Biophys Acta 2014; 1843:1207-1215. [PMID: 24632503 DOI: 10.1016/j.bbamcr.2014.03.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 02/24/2014] [Accepted: 03/04/2014] [Indexed: 02/07/2023]
Abstract
We previously identified the Arabidopsis thaliana-derived decapeptide OSIP108, which increases tolerance of plants and yeast cells to oxidative stress. As excess copper (Cu) is known to induce oxidative stress and apoptosis, and is characteristic for the human pathology Wilson disease, we investigated the effect of OSIP108 on Cu-induced toxicity in yeast. We found that OSIP108 increased yeast viability in the presence of toxic Cu concentrations, and decreased the prevalence of Cu-induced apoptotic markers. Next, we translated these results to the human hepatoma HepG2 cell line, demonstrating anti-apoptotic activity of OSIP108 in this cell line. In addition, we found that OSIP108 did not affect intracellular Cu levels in HepG2 cells, but preserved HepG2 mitochondrial ultrastructure. As Cu is known to induce acid sphingomyelinase activity of HepG2 cells, we performed a sphingolipidomic analysis of OSIP108-treated HepG2 cells. We demonstrated that OSIP108 decreased the levels of several sphingoid bases and ceramide species. Moreover, exogenous addition of the sphingoid base dihydrosphingosine abolished the protective effect of OSIP108 against Cu-induced cell death in yeast. These findings indicate the potential of OSIP108 to prevent Cu-induced apoptosis, possibly via its effects on sphingolipid homeostasis.
Collapse
Affiliation(s)
- Pieter Spincemaille
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| | - Gursimran Chandhok
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Benjamin Newcomb
- Department of Medicine and the Stony Brook Cancer Center, University of Stony Brook, Stony Brook, New York, 11794, USA
| | - Jef Verbeek
- Department of Hepatology and Metabolic Center, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - Kim Vriens
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| | - Andree Zibert
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Hartmut Schmidt
- Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany
| | - Yusuf A Hannun
- Department of Medicine and the Stony Brook Cancer Center, University of Stony Brook, Stony Brook, New York, 11794, USA
| | - Jos van Pelt
- Department of Hepatology and Metabolic Center, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - David Cassiman
- Department of Hepatology and Metabolic Center, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
| | - Bruno P A Cammue
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium.,Department of Plant Systems Biology, VIB, Technologiepark 927, 9052, Ghent, Belgium
| | - Karin Thevissen
- Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| |
Collapse
|
12
|
Aggarwal A, Chandhok G, Todorov T, Parekh S, Tilve S, Zibert A, Bhatt M, Schmidt HHJ. Wilson disease mutation pattern with genotype-phenotype correlations from Western India: confirmation of p.C271* as a common Indian mutation and identification of 14 novel mutations. Ann Hum Genet 2013; 77:299-307. [PMID: 23551039 DOI: 10.1111/ahg.12024] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 01/24/2013] [Accepted: 02/06/2013] [Indexed: 12/13/2022]
Abstract
Wilson disease (WD) is an autosomal recessive disorder resulting from mutations in the ATP7B gene, with over 600 mutations described. Identification of mutations has made genetic diagnosis of WD feasible in many countries. The heterogeneity of ATP7B mutants is, however, yet to be identified in the Indian population. We analyzed the mutational pattern of WD in a large region of Western India. We studied patients (n = 52) for ATP7B gene mutations in a cohort of families with WD and also in first-degree relatives (n = 126). All 21 exon-intron boundaries of the WD gene were amplified and directly sequenced. We identified 36 different disease-causing mutations (31 exonic and five intronic splice site variants). Fourteen novel mutations were identified. Exons 2, 8, 13, 14, and 18 accounted for the majority of mutations (86.4%). A previously recognized mutation, p.C271*, and the novel mutation p.E122fs, were the most common mutations with allelic frequencies of 20.2% and 10.6%, respectively. Frequent homozygous mutations (58.9%) and disease severity assessments allowed analysis of genotype-phenotype correlations. Our study significantly adds to the emerging data from other parts of India suggesting that p.C271* may be the most frequent mutation across India, and may harbor a moderate to severely disabling phenotype with limited variability.
Collapse
Affiliation(s)
- Annu Aggarwal
- Wilson Disease Clinic, Kokilaben Dhirubhai Ambani Hospital & Medical Research Institute, Mumbai, India
| | | | | | | | | | | | | | | |
Collapse
|