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Dolgova N, Uhlemann EME, Boniecki MT, Vizeacoumar FS, Ara A, Nouri P, Ralle M, Tonelli M, Abbas SA, Patry J, Elhasasna H, Freywald A, Vizeacoumar FJ, Dmitriev OY. MEMO1 binds iron and modulates iron homeostasis in cancer cells. eLife 2024; 13:e86354. [PMID: 38640016 PMCID: PMC11081632 DOI: 10.7554/elife.86354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 04/15/2024] [Indexed: 04/20/2024] Open
Abstract
Mediator of ERBB2-driven cell motility 1 (MEMO1) is an evolutionary conserved protein implicated in many biological processes; however, its primary molecular function remains unknown. Importantly, MEMO1 is overexpressed in many types of cancer and was shown to modulate breast cancer metastasis through altered cell motility. To better understand the function of MEMO1 in cancer cells, we analyzed genetic interactions of MEMO1 using gene essentiality data from 1028 cancer cell lines and found multiple iron-related genes exhibiting genetic relationships with MEMO1. We experimentally confirmed several interactions between MEMO1 and iron-related proteins in living cells, most notably, transferrin receptor 2 (TFR2), mitoferrin-2 (SLC25A28), and the global iron response regulator IRP1 (ACO1). These interactions indicate that cells with high-MEMO1 expression levels are hypersensitive to the disruptions in iron distribution. Our data also indicate that MEMO1 is involved in ferroptosis and is linked to iron supply to mitochondria. We have found that purified MEMO1 binds iron with high affinity under redox conditions mimicking intracellular environment and solved MEMO1 structures in complex with iron and copper. Our work reveals that the iron coordination mode in MEMO1 is very similar to that of iron-containing extradiol dioxygenases, which also display a similar structural fold. We conclude that MEMO1 is an iron-binding protein that modulates iron homeostasis in cancer cells.
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Affiliation(s)
- Natalia Dolgova
- Department of Biochemistry, Microbiology and Immunology, University of SaskatchewanSaskatoonCanada
| | - Eva-Maria E Uhlemann
- Department of Biochemistry, Microbiology and Immunology, University of SaskatchewanSaskatoonCanada
| | - Michal T Boniecki
- Protein Characterization and Crystallization Facility, University of SaskatchewanSaskatoonCanada
| | | | - Anjuman Ara
- Department of Biochemistry, Microbiology and Immunology, University of SaskatchewanSaskatoonCanada
| | - Paria Nouri
- Department of Biochemistry, Microbiology and Immunology, University of SaskatchewanSaskatoonCanada
| | - Martina Ralle
- Department of Molecular and Medical Genetics, Oregon Health and Sciences UniversityPortlandUnited States
| | - Marco Tonelli
- National Magnetic Resonance Facility at Madison (NMRFAM), University of WisconsinMadisonUnited States
| | - Syed A Abbas
- Department of Biochemistry, Microbiology and Immunology, University of SaskatchewanSaskatoonCanada
| | - Jaala Patry
- Department of Biochemistry, Microbiology and Immunology, University of SaskatchewanSaskatoonCanada
| | - Hussain Elhasasna
- Department of Pathology and Laboratory Medicine, University of SaskatchewanSaskatoonCanada
| | - Andrew Freywald
- Department of Pathology and Laboratory Medicine, University of SaskatchewanSaskatoonCanada
| | - Franco J Vizeacoumar
- Cancer Research Department, Saskatchewan Cancer AgencySaskatoonCanada
- Division of Oncology, University of SaskatchewanSaskatoonCanada
| | - Oleg Y Dmitriev
- Department of Biochemistry, Microbiology and Immunology, University of SaskatchewanSaskatoonCanada
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2
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Messer LF, Bourne DG, Robbins SJ, Clay M, Bell SC, McIlroy SJ, Tyson GW. A genome-centric view of the role of the Acropora kenti microbiome in coral health and resilience. Nat Commun 2024; 15:2902. [PMID: 38575584 PMCID: PMC10995205 DOI: 10.1038/s41467-024-46905-5] [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: 08/29/2023] [Accepted: 03/13/2024] [Indexed: 04/06/2024] Open
Abstract
Microbial diversity has been extensively explored in reef-building corals. However, the functional roles of coral-associated microorganisms remain poorly elucidated. Here, we recover 191 bacterial and 10 archaeal metagenome-assembled genomes (MAGs) from the coral Acropora kenti (formerly A. tenuis) and adjacent seawater, to identify microbial functions and metabolic interactions within the holobiont. We show that 82 MAGs were specific to the A. kenti holobiont, including members of the Pseudomonadota, Bacteroidota, and Desulfobacterota. A. kenti-specific MAGs displayed significant differences in their genomic features and functional potential relative to seawater-specific MAGs, with a higher prevalence of genes involved in host immune system evasion, nitrogen and carbon fixation, and synthesis of five essential B-vitamins. We find a diversity of A. kenti-specific MAGs encode the biosynthesis of essential amino acids, such as tryptophan, histidine, and lysine, which cannot be de novo synthesised by the host or Symbiodiniaceae. Across a water quality gradient spanning 2° of latitude, A. kenti microbial community composition is correlated to increased temperature and dissolved inorganic nitrogen, with corresponding enrichment in molecular chaperones, nitrate reductases, and a heat-shock protein. We reveal mechanisms of A. kenti-microbiome-symbiosis on the Great Barrier Reef, highlighting the interactions underpinning the health of this keystone holobiont.
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Affiliation(s)
- Lauren F Messer
- Centre for Microbiome Research, School of Biomedical Sciences, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, 4102, Australia.
- Division of Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling, FK9 4LA, Scotland, UK.
| | - David G Bourne
- College of Science and Engineering, James Cook University, Townsville, QLD, 4811, Australia
- Australian Institute of Marine Science, Townsville, QLD, 4810, Australia
| | - Steven J Robbins
- Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Megan Clay
- Centre for Microbiome Research, School of Biomedical Sciences, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, 4102, Australia
| | - Sara C Bell
- College of Science and Engineering, James Cook University, Townsville, QLD, 4811, Australia
- Australian Institute of Marine Science, Townsville, QLD, 4810, Australia
| | - Simon J McIlroy
- Centre for Microbiome Research, School of Biomedical Sciences, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, 4102, Australia
| | - Gene W Tyson
- Centre for Microbiome Research, School of Biomedical Sciences, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, 4102, Australia.
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3
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Zhang X, Walke G, Wittung-Stafshede P. Memo1 reduces copper-mediated reactive oxygen species in breast cancer cells. J Inorg Biochem 2023; 247:112335. [PMID: 37487298 DOI: 10.1016/j.jinorgbio.2023.112335] [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: 07/06/2023] [Revised: 07/17/2023] [Accepted: 07/18/2023] [Indexed: 07/26/2023]
Abstract
The mediator of ERBB2-driven cell motility protein 1, Memo1, plays important roles in cancer signaling pathways. We recently reported Memo1 to coordinate reduced copper ions and protect them from reactive oxygen species (ROS) generation in vitro. We here assess if this Memo1 activity is at play in breast cancer cells. Copper additions to MDA-MB-231 cells promoted cell death, and this toxicity was exaggerated when Memo1 expression was reduced by silencing RNA. Using three different commercial ROS probes, we revealed that copper additions increased intracellular ROS levels, and these were further elevated when Memo1 expression was silenced. We propose that, in addition to other functions, Memo1 protects cancer cells from unwanted copper-mediated redox reactions. This may be a required safety mechanism in cancer cells as they have a high demand for copper.
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Affiliation(s)
- Xiaolu Zhang
- Department of Life Sciences, Chalmers University of Technology, Gothenburg, Sweden
| | - Gulshan Walke
- Department of Life Sciences, Chalmers University of Technology, Gothenburg, Sweden
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4
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Kiel M, Wuebker S, Remy M, Riemondy K, Smith F, Carey C, Williams T, Van Otterloo E. MEMO1 Is Required for Ameloblast Maturation and Functional Enamel Formation. J Dent Res 2023; 102:1261-1271. [PMID: 37475472 PMCID: PMC11066519 DOI: 10.1177/00220345231185758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/22/2023] Open
Abstract
Coordinated mineralization of soft tissue is central to organismal form and function, while dysregulated mineralization underlies several human pathologies. Oral epithelial-derived ameloblasts are polarized, secretory cells responsible for generating enamel, the most mineralized substance in the human body. Defects in ameloblast development result in enamel anomalies, including amelogenesis imperfecta. Identifying proteins critical in ameloblast development can provide insight into specific pathologies associated with enamel-related disorders or, more broadly, mechanisms of mineralization. Previous studies identified a role for MEMO1 in bone mineralization; however, whether MEMO1 functions in the generation of additional mineralized structures remains unknown. Here, we identify a critical role for MEMO1 in enamel mineralization. First, we show that Memo1 is expressed in ameloblasts and, second, that its conditional deletion from ameloblasts results in enamel defects, characterized by a decline in mineral density and tooth integrity. Histology revealed that the mineralization defects in Memo1 mutant ameloblasts correlated with a disruption in ameloblast morphology. Finally, molecular profiling of ameloblasts and their progenitors in Memo1 oral epithelial mutants revealed a disruption to cytoskeletal-associated genes and a reduction in late-stage ameloblast markers, relative to controls. Collectively, our findings integrate MEMO1 into an emerging network of molecules important for ameloblast development and provide a system to further interrogate the relationship of cytoskeletal and amelogenesis-related defects.
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Affiliation(s)
- M. Kiel
- Iowa Institute for Oral Health Research, University of Iowa, College of Dentistry & Dental Clinics, Iowa City, IA, USA
- Department of Anatomy and Cell Biology, University of Iowa, Carver College of Medicine, Iowa City, IA, USA
| | - S. Wuebker
- Iowa Institute for Oral Health Research, University of Iowa, College of Dentistry & Dental Clinics, Iowa City, IA, USA
- Department of Anatomy and Cell Biology, University of Iowa, Carver College of Medicine, Iowa City, IA, USA
| | - M.T. Remy
- Iowa Institute for Oral Health Research, University of Iowa, College of Dentistry & Dental Clinics, Iowa City, IA, USA
- Roy J. Carver Department of Biomedical Engineering, College of Engineering, University of Iowa, Iowa City, IA, USA
| | - K.A. Riemondy
- RNA Bioscience Initiative, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - F. Smith
- Department of Craniofacial Biology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - C.M. Carey
- Department of Craniofacial Biology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - T. Williams
- Department of Craniofacial Biology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Children’s Hospital Colorado, Aurora, CO, USA
| | - E. Van Otterloo
- Iowa Institute for Oral Health Research, University of Iowa, College of Dentistry & Dental Clinics, Iowa City, IA, USA
- Department of Anatomy and Cell Biology, University of Iowa, Carver College of Medicine, Iowa City, IA, USA
- Department of Periodontics, University of Iowa, College of Dentistry & Dental Clinics, Iowa City, IA, USA
- The University of Iowa Craniofacial Anomalies Research Center, University of Iowa, Iowa City, IA, USA
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5
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Bartos K, Ramakrishnan SK, Braga-Lagache S, Hänzi B, Durussel F, Prakash Sridharan A, Zhu Y, Sheehan D, Hynes NE, Bonny O, Moor MB. Renal FGF23 signaling depends on redox protein Memo1 and promotes orthovanadate-sensitive protein phosphotyrosyl phosphatase activity. J Cell Commun Signal 2023; 17:705-722. [PMID: 36434320 PMCID: PMC10409928 DOI: 10.1007/s12079-022-00710-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 11/07/2022] [Indexed: 11/26/2022] Open
Abstract
Memo1 deletion in mice causes premature aging and an unbalanced metabolism partially resembling Fgf23 and Klotho loss-of-function animals. We report a role for Memo's redox function in renal FGF23-Klotho signaling using mice with postnatally induced Memo deficiency in the whole body (cKO). Memo cKO mice showed impaired FGF23-driven renal ERK phosphorylation and transcriptional responses. FGF23 actions involved activation of oxidation-sensitive protein phosphotyrosyl phosphatases in the kidney. Redox proteomics revealed excessive thiols of Rho-GDP dissociation inhibitor 1 (Rho-GDI1) in Memo cKO, and we detected a functional interaction between Memo's redox function and oxidation at Rho-GDI1 Cys79. In isolated cellular systems, Rho-GDI1 did not directly affect FGF23-driven cell signaling, but we detected disturbed Rho-GDI1 dependent small Rho-GTPase protein abundance and activity in the kidney of Memo cKO mice. Collectively, this study reveals previously unknown layers in the regulation of renal FGF23 signaling and connects Memo with the network of small Rho-GTPases.
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Affiliation(s)
- Katalin Bartos
- Department of Nephrology and Hypertension, Bern University Hospital and Department of Biomedical Research, University of Bern, Freiburgstrasse 15, 3010, Bern, Switzerland
- National Center of Competence in Research (NCCR) Kidney Control of Homeostasis (Kidney.CH), University of Zurich, Zurich, Switzerland
| | - Suresh Krishna Ramakrishnan
- National Center of Competence in Research (NCCR) Kidney Control of Homeostasis (Kidney.CH), University of Zurich, Zurich, Switzerland
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
| | - Sophie Braga-Lagache
- Proteomics and Mass Spectrometry Core Facility, Department for Biomedical Research (DBMR), University of Berne, Berne, Switzerland
| | - Barbara Hänzi
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
| | - Fanny Durussel
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
| | - Arjun Prakash Sridharan
- Proteomic Research Group, School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
| | - Yao Zhu
- Proteomic Research Group, School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - David Sheehan
- Proteomic Research Group, School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
- Department of Chemistry, College of Arts and Sciences, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
| | - Nancy E Hynes
- Friedrich Miescher Institute for Biomedical Research and University of Basel, Basel, Switzerland
| | - Olivier Bonny
- National Center of Competence in Research (NCCR) Kidney Control of Homeostasis (Kidney.CH), University of Zurich, Zurich, Switzerland
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland
- Service of Nephrology, Department of Medicine, Lausanne University Hospital, Lausanne, Switzerland
- Service of Nephrology, Department of Medicine, Hôpital Fribourgeois, Fribourg, Switzerland
| | - Matthias B Moor
- Department of Nephrology and Hypertension, Bern University Hospital and Department of Biomedical Research, University of Bern, Freiburgstrasse 15, 3010, Bern, Switzerland.
- National Center of Competence in Research (NCCR) Kidney Control of Homeostasis (Kidney.CH), University of Zurich, Zurich, Switzerland.
- Department of Biomedical Sciences, University of Lausanne, Lausanne, Switzerland.
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6
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Bartos K, Moor MB. FGFR regulator Memo1 is dispensable for FGF23 expression by osteoblasts during folic acid-driven kidney injury. Physiol Rep 2023; 11:e15650. [PMID: 36967231 PMCID: PMC10040316 DOI: 10.14814/phy2.15650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 03/04/2023] [Accepted: 03/07/2023] [Indexed: 03/28/2023] Open
Abstract
Loss of the mediator Of cell motility 1 (Memo1) in mice caused kidney disease and a bone disease with diminished osteoblast and osteoclast biomarkers in serum, resembling alterations occurring in adynamic bone disease in humans with chronic kidney disease or in Klotho-deficient mice. Here, we investigated whether Memo1 expression in osteoblasts is required for normal bone structure and FGF23 expression. We deleted Memo1 in the osteoblast-osteocyte lineage in Memo fl/fl mice using a Cre under Col1a1 promotor to obtain osteoblast-specific knockout (obKO) mice. We studied organs by micro-computed tomography, qPCR, and western blot. We challenged mice with folic acid for acute kidney injury (AKI) and analyzed organs. Memo obKO were viable without changes in gross anatomy, serum electrolytes, or circulating FGF23 concentrations compared to controls. Memo1 expression was blunted in bones of Memo obKO, whereas it remained unchanged in other organs. Micro-CT revealed no differences between genotypes in bone structure of vertebrae, femur, and tibia. During AKI, Fgf23 expression in calvaria, and renal transcriptional changes were comparable between genotypes. However, renal injury marker expression, circulating FGF23, and parathyroid hormone revealed a sex difference with more severely affected females than males of either genotype. The present data imply that Memo1 in osteoblasts is dispensable for bone structure and expression of Fgf23. Moreover, we found evidence of potential sex differences in murine folic acid nephropathy similar to other experimental models of renal injury that are important to consider when using this experimental model of renal injury.
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Affiliation(s)
- Katalin Bartos
- Department of Nephrology and HypertensionBern University HospitalBernSwitzerland
- Department of Biomedical ResearchUniversity of BernBernSwitzerland
- National Center of Competence in Research (NCCR) Kidney Control of Homeostasis (Kidney.CH), University of ZurichZurichSwitzerland
| | - Matthias B. Moor
- Department of Nephrology and HypertensionBern University HospitalBernSwitzerland
- Department of Biomedical ResearchUniversity of BernBernSwitzerland
- National Center of Competence in Research (NCCR) Kidney Control of Homeostasis (Kidney.CH), University of ZurichZurichSwitzerland
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Vitaliti A, Roccatani I, Iorio E, Perta N, Gismondi A, Chirico M, Pisanu ME, Di Marino D, Canini A, De Luca A, Rossi L. AKT-driven epithelial-mesenchymal transition is affected by copper bioavailability in HER2 negative breast cancer cells via a LOXL2-independent mechanism. Cell Oncol (Dordr) 2023; 46:93-115. [PMID: 36454513 PMCID: PMC9947069 DOI: 10.1007/s13402-022-00738-w] [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] [Accepted: 10/23/2022] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND The main mechanism underlying cancer dissemination is the epithelial to mesenchymal transition (EMT). This process is orchestrated by cytokines like TGFβ, involving "non-canonical" AKT- or STAT3-driven pathways. Recently, the alteration of copper homeostasis seems involved in the onset and progression of cancer. METHODS We expose different breast cancer cell lines, including two triple negative (TNBC) ones, an HER2 enriched and one cell line representative of the Luminal A molecular subtype, to short- or long-term copper-chelation by triethylenetetramine (TRIEN). We analyse changes in the expression of EMT markers (E-cadherin, fibronectin, vimentin and αSMA), in the levels and activity of extracellular matrix components (LOXL2, fibronectin and MMP2/9) and of copper homeostasis markers by Western blot analyses, immunofluorescence, enzyme activity assays and RT-qPCR. Boyden Chamber and wound healing assays revealed the impact of copper chelation on cell migration. Additionally, we explored whether perturbation of copper homeostasis affects EMT prompted by TGFβ. Metabolomic and lipidomic analyses were applied to search the effects of copper chelation on the metabolism of breast cancer cells. Finally, bioinformatics analysis of data on breast cancer patients obtained from different databases was employed to correlate changes in kinases and copper markers with patients' survival. RESULTS Remarkably, only HER2 negative breast cancer cells differently responded to short- or long-term exposure to TRIEN, initially becoming more aggressive but, upon prolonged exposure, retrieving epithelial features, reducing their invasiveness. This phenomenon may be related to the different impact of the short and prolonged activation of the AKT kinase and to the repression of STAT3 signalling. Bioinformatics analyses confirmed the positive correlation of breast cancer patients' survival with AKT activation and up-regulation of CCS. Eventually, metabolomics studies demonstrate a prevalence of glycolysis over mitochondrial energetic metabolism and of lipidome changes in TNBC cells upon TRIEN treatment. CONCLUSIONS We provide evidence of a pivotal role of copper in AKT-driven EMT activation, acting independently of HER2 in TNBC cells and via a profound change in their metabolism. Our results support the use of copper-chelators as an adjuvant therapeutic strategy for TNBC.
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Affiliation(s)
- Alessandra Vitaliti
- Department of Biology, University of Rome “Tor Vergata”, Via Della Ricerca Scientifica 1, 00133 Rome, Italy ,PhD program in Cellular and Molecular Biology, Department of Biology, University of Rome “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Ilenia Roccatani
- Department of Biology, University of Rome “Tor Vergata”, Via Della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Egidio Iorio
- Core Facilities High Resolution NMR Unit, Istituto Superiore Di Sanità, 00161 Rome, Italy
| | - Nunzio Perta
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Angelo Gismondi
- Department of Biology, University of Rome “Tor Vergata”, Via Della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Mattea Chirico
- Core Facilities High Resolution NMR Unit, Istituto Superiore Di Sanità, 00161 Rome, Italy
| | - Maria Elena Pisanu
- Core Facilities High Resolution NMR Unit, Istituto Superiore Di Sanità, 00161 Rome, Italy
| | - Daniele Di Marino
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Antonella Canini
- Department of Biology, University of Rome “Tor Vergata”, Via Della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Anastasia De Luca
- Department of Biology, University of Rome "Tor Vergata", Via Della Ricerca Scientifica 1, 00133, Rome, Italy.
| | - Luisa Rossi
- Department of Biology, University of Rome "Tor Vergata", Via Della Ricerca Scientifica 1, 00133, Rome, Italy.
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Repression of Memo1, a Novel Target of Human Papillomavirus Type 16 E7, Increases Cell Proliferation in Cervical Cancer Cells. J Virol 2022; 96:e0122922. [PMID: 36197110 PMCID: PMC9599245 DOI: 10.1128/jvi.01229-22] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Human papillomavirus (HPV)-induced carcinogenesis is associated with unregulated expression of the oncoproteins E6 and E7. HPV E7 is a viral protein that lacks enzymatic activity; however, it can target several cellular proteins to induce cell transformation and promote uncontrolled proliferation. Although several E7 targets have been described, there are still gaps in the understanding of how this oncoprotein drives cells toward malignancy. Here, using a small HPV type 16 (HPV16) E7 peptide in a proteomic approach, we report Memo1 as a new E7 binding partner, interacting through the aspartic and glutamic acid residues (E80 and D81) in the C-terminal region of HPV16 E7. Furthermore, we demonstrate that HPV16 E7 targets Memo1 for proteasomal degradation through a Cullin2-dependent mechanism. In addition, we show that overexpression of Memo1 decreases cell transformation and proliferation and that reduction of Memo1 levels correlate with activation of Akt and an increase in invasion of HPV-positive cervical cancer cell lines. Our results show a novel HPV E7 interacting partner and describe novel functions of Memo1 in the context of HPV-induced malignancy. IMPORTANCE Although numerous targets have been reported to interact with the HPV E7 oncoprotein, the mechanisms involved in HPV-induced carcinogenesis and the maintenance of cell transformation are still lacking. Here, through pulldown assays using a peptide encompassing the C-terminal region of HPV16 E7, we report Memo1 as a novel E7 interactor. High levels of Memo1 correlated with reduced cell proliferation and, concordantly, knockdown of Memo1 resulted in Akt activation in HPV-positive cell lines. These results highlight new mechanisms used by HPV oncoproteins to modulate proliferation pathways in cervical cancer cells and increase our understanding of the link between Memo1 protein and cancer.
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9
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Memo1 binds reduced copper ions, interacts with copper chaperone Atox1, and protects against copper-mediated redox activity in vitro. Proc Natl Acad Sci U S A 2022; 119:e2206905119. [PMID: 36067318 PMCID: PMC9477392 DOI: 10.1073/pnas.2206905119] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Since many proteins depend on copper ions for functionality, it is not surprising that cancer cells have a high demand for copper. Still, free copper ions are toxic as they can potentially catalyze the formation of harmful reactive oxygen species (ROS) upon coupling redox cycling between Cu(I) and Cu(II) with reduction of O2. Here, we investigated copper binding to Memo1, an oncogenic protein linked to cancer. We demonstrate that Memo1 coordinates reduced but not oxidized copper ions, thereby preventing the copper ions from acting as redox catalysts for ROS generation. As Memo1 is a putative target for the treatment of cancer, it is of importance to identify its binding partners (e.g., metal ions) and the functional consequences of such interactions. The protein mediator of ERBB2-driven cell motility 1 (Memo1) is connected to many signaling pathways that play key roles in cancer. Memo1 was recently postulated to bind copper (Cu) ions and thereby promote the generation of reactive oxygen species (ROS) in cancer cells. Since the concentration of Cu as well as ROS are increased in cancer cells, both can be toxic if not well regulated. Here, we investigated the Cu-binding capacity of Memo1 using an array of biophysical methods at reducing as well as oxidizing conditions in vitro. We find that Memo1 coordinates two reduced Cu (Cu(I)) ions per protein, and, by doing so, the metal ions are shielded from ROS generation. In support of biological relevance, we show that the cytoplasmic Cu chaperone Atox1, which delivers Cu(I) in the secretory pathway, can interact with and exchange Cu(I) with Memo1 in vitro and that the two proteins exhibit spatial proximity in breast cancer cells. Thus, Memo1 appears to act as a Cu(I) chelator (perhaps shuttling the metal ion to Atox1 and the secretory path) that protects cells from Cu-mediated toxicity, such as uncontrolled formation of ROS. This Memo1 functionality may be a safety mechanism to cope with the increased demand of Cu ions in cancer cells.
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10
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Biró B, Gál Z, Schiavo G, Ribari A, Joe Utzeri V, Brookman M, Fontanesi L, Hoffmann OI. Nuclear mitochondrial DNA sequences in the rabbit genome. Mitochondrion 2022; 66:1-6. [PMID: 35842180 DOI: 10.1016/j.mito.2022.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 05/23/2022] [Accepted: 07/10/2022] [Indexed: 10/17/2022]
Abstract
Numtogenesis is observable in the mammalian genomes resulting in the integration of mitochondrial segments into the nuclear genomes (numts). To identify numts in rabbit, we aligned mitochondrial and nuclear genomes. Alignment significance threshold was calculated and individual characteristics of numts were analysed. We found 153 numts in the nuclear genome. The GC content of numts were significantly lower than the GC content of their genomic flanking regions or the genome itself. The frequency of three mammalian-wide interspersed repeats were increased in the proximity of numts. The decreased GC content around numts strengthen the theory which supposes a link between DNA structural instability and numt integration.
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Affiliation(s)
- Bálint Biró
- Hungarian University of Agricultural and Life Sciences, Institute of Genetics and Biotechnology, Szent-Györgyi Albert Str. 4, H-2100, Gödöllö, Hungary
| | - Zoltán Gál
- Hungarian University of Agricultural and Life Sciences, Institute of Genetics and Biotechnology, Szent-Györgyi Albert Str. 4, H-2100, Gödöllö, Hungary
| | - Giuseppina Schiavo
- University of Bologna, Department of Agricultural and Food Sciences, Division of Animal Sciences, Viale Fanin 46, 40127 Bologna, Italy
| | - Anisa Ribari
- University of Bologna, Department of Agricultural and Food Sciences, Division of Animal Sciences, Viale Fanin 46, 40127 Bologna, Italy
| | - Valerio Joe Utzeri
- University of Bologna, Department of Agricultural and Food Sciences, Division of Animal Sciences, Viale Fanin 46, 40127 Bologna, Italy
| | - Michael Brookman
- Hanze University of Applied Sciences, Department for Biology and Medical Laboratory Research, Zernikeplein 7, 9747 AS Groningen, Netherlands
| | - Luca Fontanesi
- University of Bologna, Department of Agricultural and Food Sciences, Division of Animal Sciences, Viale Fanin 46, 40127 Bologna, Italy
| | - Orsolya Ivett Hoffmann
- Hungarian University of Agricultural and Life Sciences, Institute of Genetics and Biotechnology, Szent-Györgyi Albert Str. 4, H-2100, Gödöllö, Hungary.
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Bin-Jumah MN, Nadeem MS, Gilani SJ, Al-Abbasi FA, Ullah I, Alzarea SI, Ghoneim MM, Alshehri S, Uddin A, Murtaza BN, Kazmi I. Genes and Longevity of Lifespan. Int J Mol Sci 2022; 23:ijms23031499. [PMID: 35163422 PMCID: PMC8836117 DOI: 10.3390/ijms23031499] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 01/04/2022] [Accepted: 01/26/2022] [Indexed: 12/12/2022] Open
Abstract
Aging is a complex process indicated by low energy levels, declined physiological activity, stress induced loss of homeostasis leading to the risk of diseases and mortality. Recent developments in medical sciences and an increased availability of nutritional requirements has significantly increased the average human lifespan worldwide. Several environmental and physiological factors contribute to the aging process. However, about 40% human life expectancy is inherited among generations, many lifespan associated genes, genetic mechanisms and pathways have been demonstrated during last decades. In the present review, we have evaluated many human genes and their non-human orthologs established for their role in the regulation of lifespan. The study has included more than fifty genes reported in the literature for their contributions to the longevity of life. Intact genomic DNA is essential for the life activities at the level of cell, tissue, and organ. Nucleic acids are vulnerable to oxidative stress, chemotherapies, and exposure to radiations. Efficient DNA repair mechanisms are essential for the maintenance of genomic integrity, damaged DNA is not replicated and transferred to next generations rather the presence of deleterious DNA initiates signaling cascades leading to the cell cycle arrest or apoptosis. DNA modifications, DNA methylation, histone methylation, histone acetylation and DNA damage can eventually lead towards apoptosis. The importance of calorie restriction therapy in the extension of lifespan has also been discussed. The role of pathways involved in the regulation of lifespan such as DAF-16/FOXO (forkhead box protein O1), TOR and JNK pathways has also been particularized. The study provides an updated account of genetic factors associated with the extended lifespan and their interactive contributory role with cellular pathways.
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Affiliation(s)
- May Nasser Bin-Jumah
- Biology Department, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi Arabia;
- Environment and Biomaterial Unit, Health Sciences Research Center, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi Arabia
| | - Muhammad Shahid Nadeem
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
- Correspondence: (M.S.N.); (I.K.)
| | - Sadaf Jamal Gilani
- Department of Basic Health Sciences, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi Arabia;
| | - Fahad A. Al-Abbasi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
| | - Inam Ullah
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore 54000, Pakistan;
| | - Sami I. Alzarea
- Department of Pharmacology, College of Pharmacy, Jouf University, Sakaka 72341, Saudi Arabia;
| | - Mohammed M. Ghoneim
- Department of Pharmacy Practice, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia;
| | - Sultan Alshehri
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;
| | - Aziz Uddin
- Department of Biotechnology and Genetic Engineering, Hazara University, Mansehra 21300, Pakistan;
| | - Bibi Nazia Murtaza
- Department of Zoology, Abbottabad University of Science and Technology (AUST), Abbottabad 22310, Pakistan;
| | - Imran Kazmi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
- Correspondence: (M.S.N.); (I.K.)
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Lutsenko S. Dynamic and cell-specific transport networks for intracellular copper ions. J Cell Sci 2021; 134:272704. [PMID: 34734631 DOI: 10.1242/jcs.240523] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Copper (Cu) homeostasis is essential for the development and function of many organisms. In humans, Cu misbalance causes serious pathologies and has been observed in a growing number of diseases. This Review focuses on mammalian Cu(I) transporters and highlights recent studies on regulation of intracellular Cu fluxes. Cu is used by essential metabolic enzymes for their activity. These enzymes are located in various intracellular compartments and outside cells. When cells differentiate, or their metabolic state is otherwise altered, the need for Cu in different cell compartments change, and Cu has to be redistributed to accommodate these changes. The Cu transporters SLC31A1 (CTR1), SLC31A2 (CTR2), ATP7A and ATP7B regulate Cu content in cellular compartments and maintain Cu homeostasis. Increasing numbers of regulatory proteins have been shown to contribute to multifaceted regulation of these Cu transporters. It is becoming abundantly clear that the Cu transport networks are dynamic and cell specific. The comparison of the Cu transport machinery in the liver and intestine illustrates the distinct composition and dissimilar regulatory response of their Cu transporters to changing Cu levels.
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Affiliation(s)
- Svetlana Lutsenko
- Johns Hopkins Medical Institutes, Department of Physiology, Baltimore, MD 21205, USA
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