1
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Günes Günsel G, Conlon TM, Jeridi A, Kim R, Ertüz Z, Lang NJ, Ansari M, Novikova M, Jiang D, Strunz M, Gaianova M, Hollauer C, Gabriel C, Angelidis I, Doll S, Pestoni JC, Edelmann SL, Kohlhepp MS, Guillot A, Bassler K, Van Eeckhoutte HP, Kayalar Ö, Konyalilar N, Kanashova T, Rodius S, Ballester-López C, Genes Robles CM, Smirnova N, Rehberg M, Agarwal C, Krikki I, Piavaux B, Verleden SE, Vanaudenaerde B, Königshoff M, Dittmar G, Bracke KR, Schultze JL, Watz H, Eickelberg O, Stoeger T, Burgstaller G, Tacke F, Heissmeyer V, Rinkevich Y, Bayram H, Schiller HB, Conrad M, Schneider R, Yildirim AÖ. The arginine methyltransferase PRMT7 promotes extravasation of monocytes resulting in tissue injury in COPD. Nat Commun 2022; 13:1303. [PMID: 35288557 PMCID: PMC8921220 DOI: 10.1038/s41467-022-28809-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 02/01/2022] [Indexed: 12/13/2022] Open
Abstract
Extravasation of monocytes into tissue and to the site of injury is a fundamental immunological process, which requires rapid responses via post translational modifications (PTM) of proteins. Protein arginine methyltransferase 7 (PRMT7) is an epigenetic factor that has the capacity to mono-methylate histones on arginine residues. Here we show that in chronic obstructive pulmonary disease (COPD) patients, PRMT7 expression is elevated in the lung tissue and localized to the macrophages. In mouse models of COPD, lung fibrosis and skin injury, reduced expression of PRMT7 associates with decreased recruitment of monocytes to the site of injury and hence less severe symptoms. Mechanistically, activation of NF-κB/RelA in monocytes induces PRMT7 transcription and consequential mono-methylation of histones at the regulatory elements of RAP1A, which leads to increased transcription of this gene that is responsible for adhesion and migration of monocytes. Persistent monocyte-derived macrophage accumulation leads to ALOX5 over-expression and accumulation of its metabolite LTB4, which triggers expression of ACSL4 a ferroptosis promoting gene in lung epithelial cells. Conclusively, inhibition of arginine mono-methylation might offer targeted intervention in monocyte-driven inflammatory conditions that lead to extensive tissue damage if left untreated. Chronic obstructive pulmonary disease is a progressive and incurable chronic condition that involves accumulation of inflammatory macrophages in the lung tissue. Authors here show in mouse models of lung disease that PRMT7, a protein arginine methyltransferase, is an important regulator of recruitment and the pro-inflammatory phenotype of macrophages.
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2
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Novak G, Kyriakis D, Grzyb K, Bernini M, Rodius S, Dittmar G, Finkbeiner S, Skupin A. Single-cell transcriptomics of human iPSC differentiation dynamics reveal a core molecular network of Parkinson's disease. Commun Biol 2022; 5:49. [PMID: 35027645 PMCID: PMC8758783 DOI: 10.1038/s42003-021-02973-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 12/14/2021] [Indexed: 01/02/2023] Open
Abstract
Parkinson's disease (PD) is the second-most prevalent neurodegenerative disorder, characterized by the loss of dopaminergic neurons (mDA) in the midbrain. The underlying mechanisms are only partly understood and there is no treatment to reverse PD progression. Here, we investigated the disease mechanism using mDA neurons differentiated from human induced pluripotent stem cells (hiPSCs) carrying the ILE368ASN mutation within the PINK1 gene, which is strongly associated with PD. Single-cell RNA sequencing (RNAseq) and gene expression analysis of a PINK1-ILE368ASN and a control cell line identified genes differentially expressed during mDA neuron differentiation. Network analysis revealed that these genes form a core network, members of which interact with all known 19 protein-coding Parkinson's disease-associated genes. This core network encompasses key PD-associated pathways, including ubiquitination, mitochondrial function, protein processing, RNA metabolism, and vesicular transport. Proteomics analysis showed a consistent alteration in proteins of dopamine metabolism, indicating a defect of dopaminergic metabolism in PINK1-ILE368ASN neurons. Our findings suggest the existence of a network onto which pathways associated with PD pathology converge, and offers an inclusive interpretation of the phenotypic heterogeneity of PD.
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Affiliation(s)
- Gabriela Novak
- The Integrative Cell Signalling Group, Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, Esch-sur-Alzette, Luxembourg.
- Luxembourg Institute of Health (LIH), Esch-sur-Alzette, Luxembourg.
- Center for Systems and Therapeutics, the Gladstone Institutes and Departments of Neurology and Physiology, University of California, San Francisco, San Francisco, CA, 94158, USA.
| | - Dimitrios Kyriakis
- The Integrative Cell Signalling Group, Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Kamil Grzyb
- The Integrative Cell Signalling Group, Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Michela Bernini
- The Integrative Cell Signalling Group, Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Sophie Rodius
- Department of Infection and Immunity, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Gunnar Dittmar
- Department of Infection and Immunity, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Life Sciences and Medicine, University of Luxembourg, Belvaux, Luxembourg
| | - Steven Finkbeiner
- Center for Systems and Therapeutics, the Gladstone Institutes and Departments of Neurology and Physiology, University of California, San Francisco, San Francisco, CA, 94158, USA
| | - Alexander Skupin
- The Integrative Cell Signalling Group, Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, Esch-sur-Alzette, Luxembourg.
- University of California San Diego, La Jolla, CA, 92093, USA.
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3
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Schuster A, Klein E, Neirinckx V, Knudsen AM, Fabian C, Hau AC, Dieterle M, Oudin A, Nazarov PV, Golebiewska A, Muller A, Perez-Hernandez D, Rodius S, Dittmar G, Bjerkvig R, Herold-Mende C, Klink B, Kristensen BW, Niclou SP. AN1-type zinc finger protein 3 (ZFAND3) is a transcriptional regulator that drives Glioblastoma invasion. Nat Commun 2020; 11:6366. [PMID: 33311477 PMCID: PMC7732990 DOI: 10.1038/s41467-020-20029-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 11/04/2020] [Indexed: 01/12/2023] Open
Abstract
The infiltrative nature of Glioblastoma (GBM), the most aggressive primary brain tumor, critically prevents complete surgical resection and masks tumor cells behind the blood brain barrier reducing the efficacy of systemic treatment. Here, we use a genome-wide interference screen to determine invasion-essential genes and identify the AN1/A20 zinc finger domain containing protein 3 (ZFAND3) as a crucial driver of GBM invasion. Using patient-derived cellular models, we show that loss of ZFAND3 hampers the invasive capacity of GBM, whereas ZFAND3 overexpression increases motility in cells that were initially not invasive. At the mechanistic level, we find that ZFAND3 activity requires nuclear localization and integral zinc-finger domains. Our findings indicate that ZFAND3 acts within a nuclear protein complex to activate gene transcription and regulates the promoter of invasion-related genes such as COL6A2, FN1, and NRCAM. Further investigation in ZFAND3 function in GBM and other invasive cancers is warranted. Glioblastomas (GBMs) are highly invasive brain tumours, but the underlying mechanisms of GBM invasion are unclear. Here, the authors perform an RNA interference screen and identify AN1-Type Zinc Finger protein 3 (ZFAND3) as a regulator of GBM invasion, and find that it acts through the transcriptional regulation of invasion-related genes.
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Affiliation(s)
- Anne Schuster
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Eliane Klein
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Virginie Neirinckx
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Arnon Møldrup Knudsen
- Department of Pathology, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Carina Fabian
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg.,Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Ann-Christin Hau
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Monika Dieterle
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Anais Oudin
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Petr V Nazarov
- Quantitative Biology Unit, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Anna Golebiewska
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Arnaud Muller
- Quantitative Biology Unit, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | | | - Sophie Rodius
- Quantitative Biology Unit, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Gunnar Dittmar
- Quantitative Biology Unit, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Rolf Bjerkvig
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg.,Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Christel Herold-Mende
- Division of Neurosurgical Research, Department of Neurosurgery, University of Heidelberg, Heidelberg, Germany
| | - Barbara Klink
- National Center of Genetics, Laboratoire National de Santé, Dudelange, Luxembourg.,Functional Tumor Genetics, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Bjarne Winther Kristensen
- Department of Pathology, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Simone P Niclou
- NORLUX Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health, Luxembourg, Luxembourg. .,Department of Biomedicine, University of Bergen, Bergen, Norway.
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4
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Rodius S, de Klein N, Jeanty C, Sánchez-Iranzo H, Crespo I, Ibberson M, Xenarios I, Dittmar G, Mercader N, Niclou SP, Azuaje F. Fisetin protects against cardiac cell death through reduction of ROS production and caspases activity. Sci Rep 2020; 10:2896. [PMID: 32076073 PMCID: PMC7031222 DOI: 10.1038/s41598-020-59894-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 01/28/2020] [Indexed: 12/16/2022] Open
Abstract
Myocardial infarction (MI) is a leading cause of death worldwide. Reperfusion is considered as an optimal therapy following cardiac ischemia. However, the promotion of a rapid elevation of O2 levels in ischemic cells produces high amounts of reactive oxygen species (ROS) leading to myocardial tissue injury. This phenomenon is called ischemia reperfusion injury (IRI). We aimed at identifying new and effective compounds to treat MI and minimize IRI. We previously studied heart regeneration following myocardial injury in zebrafish and described each step of the regeneration process, from the day of injury until complete recovery, in terms of transcriptional responses. Here, we mined the data and performed a deep in silico analysis to identify drugs highly likely to induce cardiac regeneration. Fisetin was identified as the top candidate. We validated its effects in an in vitro model of MI/IRI in mammalian cardiac cells. Fisetin enhances viability of rat cardiomyocytes following hypoxia/starvation – reoxygenation. It inhibits apoptosis, decreases ROS generation and caspase activation and protects from DNA damage. Interestingly, fisetin also activates genes involved in cell proliferation. Fisetin is thus a highly promising candidate drug with clinical potential to protect from ischemic damage following MI and to overcome IRI.
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Affiliation(s)
- Sophie Rodius
- Quantitative Biology Unit, Luxembourg Institute of Health (LIH), Luxembourg, 1445, Strassen, Luxembourg.
| | - Niek de Klein
- Department of Genetics, University of Groningen, Groningen, 9700 RB, The Netherlands.,The author completed this work at the Department of Oncology, Luxembourg Institute of Health (LIH), Luxembourg, 1445, Strassen, Luxembourg
| | - Céline Jeanty
- Quantitative Biology Unit, Luxembourg Institute of Health (LIH), Luxembourg, 1445, Strassen, Luxembourg
| | - Héctor Sánchez-Iranzo
- Development of the Epicardium and Its Role During Regeneration Group, Centro Nacional de Investigaciones Cardiovasculares Carlos III, 28029, Madrid, Spain
| | - Isaac Crespo
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015, Switzerland
| | - Mark Ibberson
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015, Switzerland
| | - Ioannis Xenarios
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015, Switzerland.,Center for Integrative Genomics, University of Lausanne, Lausanne, CH-1015, Switzerland.,Department of Biochemistry, University of Geneva, 1211, Geneva, Switzerland
| | - Gunnar Dittmar
- Quantitative Biology Unit, Luxembourg Institute of Health (LIH), Luxembourg, 1445, Strassen, Luxembourg
| | - Nadia Mercader
- Development of the Epicardium and Its Role During Regeneration Group, Centro Nacional de Investigaciones Cardiovasculares Carlos III, 28029, Madrid, Spain.,Institute of Anatomy, University of Bern, Bern, Switzerland
| | - Simone P Niclou
- Department of Oncology, Luxembourg Institute of Health (LIH), Luxembourg, 1445, Strassen, Luxembourg
| | - Francisco Azuaje
- Quantitative Biology Unit, Luxembourg Institute of Health (LIH), Luxembourg, 1445, Strassen, Luxembourg. .,Current affiliation: Data and Translational Sciences, UCB Celltech, 208 Bath Road, Slough, SL1 3WE, United Kingdom.
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5
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De Arcangelis A, Hamade H, Alpy F, Normand S, Bruyère E, Lefebvre O, Méchine-Neuville A, Siebert S, Pfister V, Lepage P, Laquerriere P, Dembele D, Delanoye-Crespin A, Rodius S, Robine S, Kedinger M, Van Seuningen I, Simon-Assmann P, Chamaillard M, Labouesse M, Georges-Labouesse E. Hemidesmosome integrity protects the colon against colitis and colorectal cancer. Gut 2017; 66:1748-1760. [PMID: 27371534 PMCID: PMC5595104 DOI: 10.1136/gutjnl-2015-310847] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 05/12/2016] [Accepted: 05/30/2016] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Epidemiological and clinical data indicate that patients suffering from IBD with long-standing colitis display a higher risk to develop colorectal high-grade dysplasia. Whereas carcinoma invasion and metastasis rely on basement membrane (BM) disruption, experimental evidence is lacking regarding the potential contribution of epithelial cell/BM anchorage on inflammation onset and subsequent neoplastic transformation of inflammatory lesions. Herein, we analyse the role of the α6β4 integrin receptor found in hemidesmosomes that attach intestinal epithelial cells (IECs) to the laminin-containing BM. DESIGN We developed new mouse models inducing IEC-specific ablation of α6 integrin either during development (α6ΔIEC) or in adults (α6ΔIEC-TAM). RESULTS Strikingly, all α6ΔIEC mutant mice spontaneously developed long-standing colitis, which degenerated overtime into infiltrating adenocarcinoma. The sequence of events leading to disease onset entails hemidesmosome disruption, BM detachment, IL-18 overproduction by IECs, hyperplasia and enhanced intestinal permeability. Likewise, IEC-specific ablation of α6 integrin induced in adult mice (α6ΔIEC-TAM) resulted in fully penetrant colitis and tumour progression. Whereas broad-spectrum antibiotic treatment lowered tissue pathology and IL-1β secretion from infiltrating myeloid cells, it failed to reduce Th1 and Th17 response. Interestingly, while the initial intestinal inflammation occurred independently of the adaptive immune system, tumourigenesis required B and T lymphocyte activation. CONCLUSIONS We provide for the first time evidence that loss of IECs/BM interactions triggered by hemidesmosome disruption initiates the development of inflammatory lesions that progress into high-grade dysplasia and carcinoma. Colorectal neoplasia in our mouse models resemble that seen in patients with IBD, making them highly attractive for discovering more efficient therapies.
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Affiliation(s)
- Adèle De Arcangelis
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France
| | - Hussein Hamade
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France,Current address: F. Widjaja Foundation Inflammatory Bowel & Immunobiology Research Institute, Department of Medicine, Cedars Sinai Medical Center, Los Angeles, California, USA
| | - Fabien Alpy
- Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France,Inserm, U1109, MNT3 Team, Strasbourg, France,Current address: Department of Functional Genomics and Cancer, IGBMC, Illkirch, France
| | - Sylvain Normand
- CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019—UMR 8204—CIIL—Centre d'Infection et d'Immunité de Lille, Université de Lille, Lille, France
| | - Emilie Bruyère
- Inserm, Université de Lille, CHRU Lille, UMR-S 1172—Jean-Pierre Aubert Research Center, Lille, France
| | - Olivier Lefebvre
- Université de Strasbourg, Strasbourg, France,Inserm, U1109, MNT3 Team, Strasbourg, France,LabEx Medalis, Université de Strasbourg, Strasbourg, France,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Agnès Méchine-Neuville
- Inserm, U1109, MNT3 Team, Strasbourg, France,CHRU Strasbourg, Hôpital de Hautepierre, Service d'anatomo-pathologie, Strasbourg, France,Current address: Département de Pathologie, Institut Bergonie, Bordeaux, France
| | - Stéphanie Siebert
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France
| | - Véronique Pfister
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France
| | - Patricia Lepage
- UMR1319—MICALIS Institute, INRA, AgroParisTech,Université Paris-Saclay, Jouy-en-Josas, France
| | - Patrice Laquerriere
- Université de Strasbourg, Strasbourg, France,CNRS, UMR 7178, Institut Pluridisciplinaire Hubert Curien,Strasbourg, France
| | - Doulaye Dembele
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France
| | - Anne Delanoye-Crespin
- CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019—UMR 8204—CIIL—Centre d'Infection et d'Immunité de Lille, Université de Lille, Lille, France
| | - Sophie Rodius
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France,Current address: NORLUX Neuro-Oncology Laboratory, CRP-Santé, Luxembourg
| | - Sylvie Robine
- Institut Curie, Paris, France,CNRS, UMR 144, Paris, France
| | - Michèle Kedinger
- Université de Strasbourg, Strasbourg, France,Inserm, U1109, MNT3 Team, Strasbourg, France
| | - Isabelle Van Seuningen
- Inserm, Université de Lille, CHRU Lille, UMR-S 1172—Jean-Pierre Aubert Research Center, Lille, France
| | - Patricia Simon-Assmann
- Université de Strasbourg, Strasbourg, France,Inserm, U1109, MNT3 Team, Strasbourg, France,LabEx Medalis, Université de Strasbourg, Strasbourg, France,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Mathias Chamaillard
- CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019—UMR 8204—CIIL—Centre d'Infection et d'Immunité de Lille, Université de Lille, Lille, France
| | - Michel Labouesse
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France,Current address: UMR7622, IBPS, Université Pierre et Marie Curie, Paris, France
| | - Elisabeth Georges-Labouesse
- Department of Development and Stem Cells, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France,Inserm, U964, Illkirch, France,CNRS, UMR 7104, Illkirch, France,Université de Strasbourg, Strasbourg, France
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6
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Rodius S, Fournier A, Götz L, Liechti R, Crespo I, Merz S, Nazarov PV, de Klein N, Jeanty C, González-Rosa JM, Muller A, Bernardin F, Niclou SP, Vallar L, Mercader N, Ibberson M, Xenarios I, Azuaje F. Analysis of the dynamic co-expression network of heart regeneration in the zebrafish. Sci Rep 2016; 6:26822. [PMID: 27241320 PMCID: PMC4886216 DOI: 10.1038/srep26822] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 05/09/2016] [Indexed: 12/22/2022] Open
Abstract
The zebrafish has the capacity to regenerate its heart after severe injury. While the function of a few genes during this process has been studied, we are far from fully understanding how genes interact to coordinate heart regeneration. To enable systematic insights into this phenomenon, we generated and integrated a dynamic co-expression network of heart regeneration in the zebrafish and linked systems-level properties to the underlying molecular events. Across multiple post-injury time points, the network displays topological attributes of biological relevance. We show that regeneration steps are mediated by modules of transcriptionally coordinated genes, and by genes acting as network hubs. We also established direct associations between hubs and validated drivers of heart regeneration with murine and human orthologs. The resulting models and interactive analysis tools are available at http://infused.vital-it.ch. Using a worked example, we demonstrate the usefulness of this unique open resource for hypothesis generation and in silico screening for genes involved in heart regeneration.
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Affiliation(s)
- Sophie Rodius
- Oncology Department, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health (LIH), Luxembourg, L-1526 Luxembourg
| | - Anna Fournier
- Oncology Department, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health (LIH), Luxembourg, L-1526 Luxembourg
- Present Address: Present address: Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, Belvaux, L-4367, Luxembourg.,
| | - Lou Götz
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015 Switzerland
| | - Robin Liechti
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015 Switzerland
| | - Isaac Crespo
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015 Switzerland
| | - Susanne Merz
- Oncology Department, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health (LIH), Luxembourg, L-1526 Luxembourg
| | - Petr V. Nazarov
- Oncology Department, Genomics Research Unit, LIH, L-1526 Luxembourg Luxembourg
| | - Niek de Klein
- Oncology Department, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health (LIH), Luxembourg, L-1526 Luxembourg
- Vrije Universiteit Amsterdam, 1081 HV Amsterdam The Netherlands
- Present Address: Present address: Department of Genetics, University of Groningen, Groningen, 9700 RB, The Netherlands.,
| | - Céline Jeanty
- Oncology Department, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health (LIH), Luxembourg, L-1526 Luxembourg
| | - Juan M. González-Rosa
- Cardiovascular Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114 USA
| | - Arnaud Muller
- Oncology Department, Genomics Research Unit, LIH, L-1526 Luxembourg Luxembourg
| | - Francois Bernardin
- Oncology Department, Genomics Research Unit, LIH, L-1526 Luxembourg Luxembourg
| | - Simone P. Niclou
- Oncology Department, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health (LIH), Luxembourg, L-1526 Luxembourg
| | - Laurent Vallar
- Oncology Department, Genomics Research Unit, LIH, L-1526 Luxembourg Luxembourg
| | - Nadia Mercader
- Epicardium Development and Regeneration group, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC-ISCIII), 28029 Madrid Spain
- Present Address: Present address: Department of Development and Regeneration, Institute of Anatomy, Faculty of Medicine, University of Bern, Bern, Switzerland.,
| | - Mark Ibberson
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015 Switzerland
| | - Ioannis Xenarios
- Vital-IT Systems Biology Division, SIB Swiss Institute of Bioinformatics, Lausanne, CH-1015 Switzerland
- Center for Integrative Genomics, University of Lausanne, Lausanne, CH-1015 Switzerland
- Department of Biochemistry, University of Geneva, 1211 Geneva 4, Switzerland
| | - Francisco Azuaje
- Oncology Department, NorLux Neuro-Oncology Laboratory, Luxembourg Institute of Health (LIH), Luxembourg, L-1526 Luxembourg
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7
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de Klein N, Ibberson M, Crespo I, Rodius S, Azuaje F. A gene mapping bottleneck in the translational route from zebrafish to human. Front Genet 2015; 5:470. [PMID: 25628646 PMCID: PMC4290677 DOI: 10.3389/fgene.2014.00470] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 12/19/2014] [Indexed: 11/13/2022] Open
Abstract
Among a diversity of animal models of disease, the zebrafish is a promising model organism for enabling novel translational biomedical research. To fully achieve the latter, a key requirement is to match molecular readouts measured in zebrafish with information relevant to health and disease in humans. A fundamental step in this direction is to accurately map gene sequences from zebrafish to humans. Despite significant progress in genome annotation, this remains an intricate and time-consuming challenge. Here we discuss major obstacles that we had to overcome to systematically map genes from zebrafish to human. We identified important disparities, as well as partial agreements, between five public zebrafish-to-human homology resources. There is still a need for standardized, comprehensive genomic mappings between zebrafish and humans. Without this, efforts to use zebrafish as a powerful translational research tool will be stalled.
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Affiliation(s)
- Niek de Klein
- NorLux Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health (formerly CRP-Santé) , Luxembourg, Luxembourg ; Vrije Universiteit Amsterdam , Amsterdam, Netherlands
| | - Mark Ibberson
- Vital-IT Systems Biology Division, Swiss Institute of Bioinformatics (SIB) , Lausanne, Switzerland
| | - Isaac Crespo
- Vital-IT Systems Biology Division, Swiss Institute of Bioinformatics (SIB) , Lausanne, Switzerland
| | - Sophie Rodius
- NorLux Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health (formerly CRP-Santé) , Luxembourg, Luxembourg
| | - Francisco Azuaje
- NorLux Neuro-Oncology Laboratory, Department of Oncology, Luxembourg Institute of Health (formerly CRP-Santé) , Luxembourg, Luxembourg
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Azuaje F, Zhang L, Jeanty C, Puhl SL, Rodius S, Wagner DR. Analysis of a gene co-expression network establishes robust association between Col5a2 and ischemic heart disease. BMC Med Genomics 2013; 6:13. [PMID: 23574622 PMCID: PMC3637268 DOI: 10.1186/1755-8794-6-13] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Accepted: 03/26/2013] [Indexed: 12/19/2022] Open
Abstract
Background This study aims to expand knowledge of the complex process of myocardial infarction (MI) through the application of a systems-based approach. Methods We generated a gene co-expression network from microarray data originating from a mouse model of MI. We characterized it on the basis of connectivity patterns and independent biological information. The potential clinical novelty and relevance of top predictions were assessed in the context of disease classification models. Models were validated using independent gene expression data from mouse and human samples. Results The gene co-expression network consisted of 178 genes and 7298 associations. The network was dissected into statistically and biologically meaningful communities of highly interconnected and co-expressed genes. Among the most significant communities, one was distinctly associated with molecular events underlying heart repair after MI (P < 0.05). Col5a2, a gene previously not specifically linked to MI response but responsible for the classic type of Ehlers-Danlos syndrome, was found to have many and strong co-expression associations within this community (11 connections with ρ > 0.85). To validate the potential clinical application of this discovery, we tested its disease discriminatory capacity on independently generated MI datasets from mice and humans. High classification accuracy and concordance was achieved across these evaluations with areas under the receiving operating characteristic curve above 0.8. Conclusion Network-based approaches can enable the discovery of clinically-interesting predictive insights that are accurate and robust. Col5a2 shows predictive potential in MI, and in principle may represent a novel candidate marker for the identification and treatment of ischemic cardiovascular disease.
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Affiliation(s)
- Francisco Azuaje
- Department of Translational Cardiovascular Research, CRP-Santé, Luxembourg, Luxembourg.
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Devaux Y, Bousquenaud M, Rodius S, Marie PY, Maskali F, Zhang L, Azuaje F, Wagner DR. Transforming growth factor β receptor 1 is a new candidate prognostic biomarker after acute myocardial infarction. BMC Med Genomics 2011; 4:83. [PMID: 22136666 PMCID: PMC3240818 DOI: 10.1186/1755-8794-4-83] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Accepted: 12/05/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Prediction of left ventricular (LV) remodeling after acute myocardial infarction (MI) is clinically important and would benefit from the discovery of new biomarkers. METHODS Blood samples were obtained upon admission in patients with acute ST-elevation MI who underwent primary percutaneous coronary intervention. Messenger RNA was extracted from whole blood cells. LV function was evaluated by echocardiography at 4-months. RESULTS In a test cohort of 32 MI patients, integrated analysis of microarrays with a network of protein-protein interactions identified subgroups of genes which predicted LV dysfunction (ejection fraction ≤ 40%) with areas under the receiver operating characteristic curve (AUC) above 0.80. Candidate genes included transforming growth factor beta receptor 1 (TGFBR1). In a validation cohort of 115 MI patients, TGBFR1 was up-regulated in patients with LV dysfunction (P < 0.001) and was associated with LV function at 4-months (P = 0.003). TGFBR1 predicted LV function with an AUC of 0.72, while peak levels of troponin T (TnT) provided an AUC of 0.64. Adding TGFBR1 to the prediction of TnT resulted in a net reclassification index of 8.2%. When added to a mixed clinical model including age, gender and time to reperfusion, TGFBR1 reclassified 17.7% of misclassified patients. TGFB1, the ligand of TGFBR1, was also up-regulated in patients with LV dysfunction (P = 0.004), was associated with LV function (P = 0.006), and provided an AUC of 0.66. In the rat MI model induced by permanent coronary ligation, the TGFB1-TGFBR1 axis was activated in the heart and correlated with the extent of remodeling at 2 months. CONCLUSIONS We identified TGFBR1 as a new candidate prognostic biomarker after acute MI.
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Affiliation(s)
- Yvan Devaux
- Laboratory of Cardiovascular Research Centre de Recherche Public-Santé, Luxembourg, L-1150, Luxembourg.
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Azuaje FJ, Rodius S, Zhang L, Devaux Y, Wagner DR. Information encoded in a network of inflammation proteins predicts clinical outcome after myocardial infarction. BMC Med Genomics 2011; 4:59. [PMID: 21756327 PMCID: PMC3152897 DOI: 10.1186/1755-8794-4-59] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 07/14/2011] [Indexed: 01/28/2023] Open
Abstract
Background Inflammation plays an important role in cardiac repair after myocardial infarction (MI). Nevertheless, the systems-level characterization of inflammation proteins in MI remains incomplete. There is a need to demonstrate the potential value of molecular network-based approaches to translational research. We investigated the interplay of inflammation proteins and assessed network-derived knowledge to support clinical decisions after MI. The main focus is the prediction of clinical outcome after MI. Methods We assembled My-Inflamome, a network of protein interactions related to inflammation and prognosis in MI. We established associations between network properties, disease biology and capacity to distinguish between prognostic categories. The latter was tested with classification models built on blood-derived microarray data from post-MI patients with different outcomes. This was followed by experimental verification of significant associations. Results My-Inflamome is organized into modules highly specialized in different biological processes relevant to heart repair. Highly connected proteins also tend to be high-traffic components. Such bottlenecks together with genes extracted from the modules provided the basis for novel prognostic models, which could not have been uncovered by standard analyses. Modules with significant involvement in transcriptional regulation are targeted by a small set of microRNAs. We suggest a new panel of gene expression biomarkers (TRAF2, SHKBP1 and UBC) with high discriminatory capability. Follow-up validations reported promising outcomes and motivate future research. Conclusion This study enhances understanding of the interaction network that executes inflammatory responses in human MI. Network-encoded information can be translated into knowledge with potential prognostic application. Independent evaluations are required to further estimate the clinical relevance of the new prognostic genes.
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Affiliation(s)
- Francisco J Azuaje
- Laboratory of Cardiovascular Research, Public Research Centre for Health, CRP-Santé, L-1150, Luxembourg.
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Rodius S, Mulliert G, Azuaje F, Devaux Y, Wagner DR. Matrix metalloproteinase 9 polymorphism and outcome after myocardial infarction. Cardiogenetics 2011. [DOI: 10.4081/cardiogenetics.2011.e5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Haas B, Leonard F, Ernens I, Rodius S, Vausort M, Rolland-Turner M, Devaux Y, Wagner DR. Adenosine reduces cell surface expression of toll-like receptor 4 and inflammation in response to lipopolysaccharide and matrix products. J Cardiovasc Transl Res 2011; 4:790-800. [PMID: 21538184 DOI: 10.1007/s12265-011-9279-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Accepted: 04/11/2011] [Indexed: 12/22/2022]
Abstract
Recent evidence suggests that Toll-like receptor 4 (TLR4) is not only involved in innate immunity but is also an important mediator of adverse left ventricular remodeling and heart failure following acute myocardial infarction (MI). TLR4 is activated by lipopolysaccharide (LPS) but also by products of matrix degradation such as hyaluronic acid and heparan sulfate. Although cardioprotective properties of adenosine (Ado) have been extensively studied, its potential to interfere with TLR4 activation is unknown. We observed that TLR4 pathway is activated in white blood cells from MI patients. TLR4 mRNA expression correlated with troponin T levels (R (2) = 0.75; P = 0.01) but not with levels of white blood cells and C-reactive protein. Ado downregulated TLR4 expression at the surface of human macrophages (-50%, P < 0.05). Tumor necrosis factor-α production induced by the TLR4 ligands LPS, hyaluronic acid, and heparan sulfate was potently inhibited by Ado (-75% for LPS, P < 0.005). This effect was reproduced by the A2A Ado receptor agonist CGS21680 and the non-selective agonist NECA and was inhibited by the A2A antagonist SCH58261 and the A2A/A2B antagonist ZM241,385. In contrast, Ado induced a 3-fold increase of TLR4 mRNA expression (P = 0.008), revealing the existence of a feedback mechanism to compensate for the loss of TLR4 expression at the cell surface. In conclusion, the TLR4 pathway is activated after MI and correlates with infarct severity but not with the extent of inflammation. Reduction of TLR4 expression by Ado may therefore represent an important strategy to limit remodeling post-MI.
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Affiliation(s)
- Benjamin Haas
- Laboratory of Cardiovascular Research, Centre de Recherche Public-Santé, 120 route d'Arlon 1150, Luxembourg
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Rodius S, Lambert C, Devaux C, Schmit JC, Devaux Y, Wagner DR. Chemokine receptor 5 polymorphism in myocardial infarction patients from Luxembourg. Bull Soc Sci Med Grand Duche Luxemb 2011:31-40. [PMID: 21634220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND The CC-chemokine receptor 5 (CCR5) is regulating inflammatory pathways and may thus be implicated in the development and progression of heart failure (HF). A 32 base pair deletion of the ccr5 gene, called CCR5delta32, prevents the expression of CCR5 at the cell surface. We analyzed the association between the CCR5delta32 deletion and the risk and severity of myocardial infarction (MI) in a cohort of patients from Luxembourg. METHODS Using TaqMan allelic discrimination assay, we genotyped a total of 1080 patients undergoing coronary angiography. This population contained 3 groups of patients: controls with atypical chest pain, abnormal stress testing but normal coronary angiography (n = 154), patients with angina who underwent uncomplicated primary coronary intervention (n = 230), and patients with acute MI (n = 696). In MI patients, left ventricular ejection fraction (LVEF) was determined 1-month after MI with echocardiography. RESULTS The frequency of the CCR5delta32 deletion was 16.3% in the global population, and was similar between controls, patients with angina and MI patients. The deletion was not associated with variations of plasma levels of creatine phosphokinase and troponin T, nor it was associated with LVEF, New York Heart Association class or 2-year mortality. The frequency of the deletion was comparable between MI patients with LV dysfunction (EF < or = 40%, n = 82) and no LV dysfunction (EF > 40%, n = 402). CONCLUSIONS The frequency of the CCR5delta32 deletion in Luxembourg is similar to that observed in other European countries and is not associated with the risk of developing MI and LV dysfunction.
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Affiliation(s)
- Sophie Rodius
- Laboratory of Cardiovascular Research, Centre de Recherche Public-Santé, Luxembourg
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Rodius S, Chaloin O, Moes M, Schaffner-Reckinger E, Landrieu I, Lippens G, Lin M, Zhang J, Kieffer N. The talin rod IBS2 alpha-helix interacts with the beta3 integrin cytoplasmic tail membrane-proximal helix by establishing charge complementary salt bridges. J Biol Chem 2008; 283:24212-23. [PMID: 18577523 DOI: 10.1074/jbc.m709704200] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Talin establishes a major link between integrins and actin filaments and contains two distinct integrin binding sites: one, IBS1, located in the talin head domain and involved in integrin activation and a second, IBS2, that maps to helix 50 of the talin rod domain and is essential for linking integrin beta subunits to the cytoskeleton ( Moes, M., Rodius, S., Coleman, S. J., Monkley, S. J., Goormaghtigh, E., Tremuth, L., Kox, C., van der Holst, P. P., Critchley, D. R., and Kieffer, N. (2007) J. Biol. Chem. 282, 17280-17288 ). Through the combined approach of mutational analysis of the beta3 integrin cytoplasmic tail and the talin rod IBS2 site, SPR binding studies, as well as site-specific antibody inhibition experiments, we provide evidence that the integrin beta3-talin rod interaction relies on a helix-helix association between alpha-helix 50 of the talin rod domain and the membrane-proximal alpha-helix of the beta3 integrin cytoplasmic tail. Moreover, charge complementarity between the highly conserved talin rod IBS2 lysine residues and integrin beta3 glutamic acid residues is necessary for this interaction. Our results support a model in which talin IBS2 binds to the same face of the beta3 subunit cytoplasmic helix as the integrin alphaIIb cytoplasmic tail helix, suggesting that IBS2 can only interact with the beta3 subunit following integrin activation.
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Affiliation(s)
- Sophie Rodius
- Laboratoire de Biologie et Physiologie Intégrée (CNRS/GDRE-ITI), Université du Luxembourg, L-1511 Luxembourg, Grand-Duchy of Luxembourg
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Rodius S, Indra G, Thibault C, Pfister V, Georges-Labouesse E. Loss of alpha6 integrins in keratinocytes leads to an increase in TGFbeta and AP1 signaling and in expression of differentiation genes. J Cell Physiol 2007; 212:439-49. [PMID: 17474077 DOI: 10.1002/jcp.21040] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Mice lacking the alpha6 integrin chain die at birth with severe skin blistering. To further study the function of alpha6 integrin in skin, we generated conditionally immortalized cell lines from the epidermis of wild-type and alpha6 deficient mouse embryos. Mutant cells presented a decreased adhesion on laminin 5, the major component of the basement membrane in the skin, and on laminins 10/11 and 2. A DNA array analysis revealed alterations in the expression of extracellular matrix (ECM) components including laminin 5, cytoskeletal elements, but also membrane receptors like the hemidesmosomal components integrin beta4 and collagen XVII, or growth factors and signaling molecules of the TGFbeta, EGF, and Wnt pathways. Finally, an increase of several epidermal differentiation markers was observed in cells and tissue at the protein level. Further examination of the mutant tissue revealed alterations in the filaggrin signal. These differences may be linked to an upregulation of the TGFbeta and the Jun/Fos pathways in mutant keratinocytes. These results are in favor of a role for integrin alpha6beta4 in the maintenance of basal keratinocyte properties and epidermal homeostasis.
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Affiliation(s)
- Sophie Rodius
- Department of Developmental Biology, IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), Illkirch, France
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Moes M, Rodius S, Coleman SJ, Monkley SJ, Goormaghtigh E, Tremuth L, Kox C, van der Holst PPG, Critchley DR, Kieffer N. The integrin binding site 2 (IBS2) in the talin rod domain is essential for linking integrin beta subunits to the cytoskeleton. J Biol Chem 2007; 282:17280-8. [PMID: 17430904 DOI: 10.1074/jbc.m611846200] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Talin1 is a large cytoskeletal protein that links integrins to actin filaments through two distinct integrin binding sites, one present in the talin head domain (IBS1) necessary for integrin activation and a second (IBS2) that we have previously mapped to talin residues 1984-2113 (fragment J) of the talin rod domain (1 Tremuth, L., Kreis, S., Melchior, C., Hoebeke, J., Ronde, P., Plancon, S., Takeda, K., and Kieffer, N. (2004) J. Biol. Chem. 279, 22258-22266), but whose functional role is still elusive. Using a bioinformatics and cell biology approach, we have determined the minimal structure of IBS2 and show that this integrin binding site corresponds to 23 residues located in alpha helix 50 of the talin rod domain (residues 2077-2099). Alanine mutation of 2 highly conserved residues (L2094A/I2095A) within this alpha helix, which disrupted the alpha-helical structure of IBS2 as demonstrated by infrared spectroscopy and limited trypsin proteolysis, was sufficient to prevent in vivo talin fragment J targeting to alphaIIbbeta3 integrin in focal adhesions and to inhibit in vitro this association as shown by an alphaIIbbeta3 pulldown assay. Moreover, expression of a full-length mouse green fluorescent protein-talin LI/AA mutant in mouse talin1(-/-) cells was unable to rescue the inability of these cells to assemble focal adhesions (in contrast to green fluorescent protein-talin wild type) despite the presence of IBS1. Our data provide the first direct evidence that IBS2 in the talin rod is essential to link integrins to the cytoskeleton.
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Affiliation(s)
- Michèle Moes
- Laboratoire de Biologie et Physiologie Intégrée (CNRS/GDRE-ITI), University of Luxembourg, L-1511 Luxembourg, Grand Duchy of Luxembourg, Luxembourg
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