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Berthenet K, Aïmontché E, El Mrini S, Brière J, Pion N, Iacono I, Brejon S, Monier K, Catez F, Ichim G, Combaret V, Mertani HC, Diaz JJ, Albaret MA. Spatial sequestration of activated-caspase 3 in aggresomes mediates resistance of neuroblastoma cell to bortezomib treatment. Sci Rep 2024; 14:3768. [PMID: 38355966 PMCID: PMC10866921 DOI: 10.1038/s41598-024-54140-7] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 02/08/2024] [Indexed: 02/16/2024] Open
Abstract
Neuroblastoma (NB) is the most common pediatric tumor and is currently treated by several types of therapies including chemotherapies, such as bortezomib treatment. However, resistance to bortezomib is frequently observed by mechanisms that remain to be deciphered. Bortezomib treatment leads to caspase activation and aggresome formation. Using models of patients-derived NB cell lines with different levels of sensitivity to bortezomib, we show that the activated form of caspase 3 accumulates within aggresomes of NB resistant cells leading to an impairment of bortezomib-induced apoptosis and increased cell survival. Our findings unveil a new mechanism of resistance to chemotherapy based on an altered subcellular distribution of the executioner caspase 3. This mechanism could explain the resistance developed in NB patients treated with bortezomib, emphasizing the potential of drugs targeting aggresomes.
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Affiliation(s)
- Kévin Berthenet
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Eliézer Aïmontché
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Sara El Mrini
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Johan Brière
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Nathalie Pion
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Isabelle Iacono
- Department of Translational Research and Innovation, Centre Léon Bérard, 69373, Lyon, France
| | - Stéphanie Brejon
- Department of Translational Research and Innovation, Centre Léon Bérard, 69373, Lyon, France
| | - Karine Monier
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Frédéric Catez
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Gabriel Ichim
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
- Institut Convergence PLAsCAN, 69373, Lyon Cedex 08, France
| | - Valérie Combaret
- Department of Translational Research and Innovation, Centre Léon Bérard, 69373, Lyon, France
| | - Hichem C Mertani
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
| | - Jean-Jacques Diaz
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France
- Institut Convergence PLAsCAN, 69373, Lyon Cedex 08, France
- DevWeCan Labex Laboratory, 69373, Lyon Cedex 08, France
| | - Marie Alexandra Albaret
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Cancer Research Center of Lyon, 69008, Lyon, France.
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2
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Illand A, Jouchet P, Malleval C, Gache V, Monier K, Fort E, Lévêque-Fort S. Time shifting interferences for in depth tissue imaging in single molecule localization microscopy. Biophys J 2023; 122:276a-277a. [PMID: 36783362 DOI: 10.1016/j.bpj.2022.11.1577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Affiliation(s)
- Abigail Illand
- Institut des Sciences Moléculaires d'Orsay, Centre national de la recherche scientifique (CNRS), Unité mixte de recherche 8214, Orsay, France
| | - Pierre Jouchet
- Institut des Sciences Moléculaires d'Orsay, Centre national de la recherche scientifique (CNRS), Unité mixte de recherche 8214, Orsay, France
| | | | | | - Karine Monier
- Institut NeuroMyoGène, Université Claude Bernard - Lyon, CNRS Institut national de la santé et de la recherche médicale, Lyon, France
| | - Emmanuel Fort
- École supérieure de physique et de chimie industrielles de la Ville de Paris, Paris, France
| | - Sandrine Lévêque-Fort
- Institut des Sciences Moléculaires d'Orsay, Centre national de la recherche scientifique (CNRS), Unité mixte de recherche 8214, Orsay, France
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3
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Fabre L, Rousset C, Monier K, Da Cruz-Boisson F, Bouvet P, Charreyre MT, Delair T, Fleury E, Favier A. Fluorescent Polymer-AS1411-Aptamer Probe for dSTORM Super-Resolution Imaging of Endogenous Nucleolin. Biomacromolecules 2022; 23:2302-2314. [PMID: 35549176 DOI: 10.1021/acs.biomac.1c01706] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nucleolin is a multifunctional protein involved in essential biological processes. To precisely localize it and unravel its different roles in cells, fluorescence imaging is a powerful tool, especially super-resolution techniques. Here, we developed polymer-aptamer probes, both small and bright, adapted to direct stochastic optical reconstruction microscopy (dSTORM). Well-defined fluorescent polymer chains bearing fluorophores (AlexaFluor647) and a reactive end group were prepared via RAFT polymerization. The reactive end-group was then used for the oriented conjugation with AS1411, a DNA aptamer that recognizes nucleolin with high affinity. Conjugation via strain-promoted alkyne/azide click chemistry (SPAAC) between dibenzylcyclooctyne-ended fluorescent polymer chains and 3'-azido-functionalized nucleic acids proved to be the most efficient approach. In vitro and in cellulo evaluations demonstrated that selective recognition for nucleolin was retained. Their brightness and small size make these polymer-aptamer probes an appealing alternative to immunofluorescence, especially for super-resolution (10-20 nm) nanoscopy. dSTORM imaging demonstrated the ability of our fluorescent polymer-aptamer probe to provide selective and super-resolved detection of cell surface nucleolin.
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Affiliation(s)
- Laura Fabre
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Corentin Rousset
- Univ Lyon, Centre Léon Bérard, UMR INSERM 1052 CNRS 5286, Centre de recherche en cancérologie de Lyon, Lyon F-69008, France
| | - Karine Monier
- Univ Lyon, Centre Léon Bérard, UMR INSERM 1052 CNRS 5286, Centre de recherche en cancérologie de Lyon, Lyon F-69008, France
| | - Fernande Da Cruz-Boisson
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Philippe Bouvet
- Univ Lyon, Centre Léon Bérard, UMR INSERM 1052 CNRS 5286, Centre de recherche en cancérologie de Lyon, Lyon F-69008, France
| | - Marie-Thérèse Charreyre
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Thierry Delair
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Etienne Fleury
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Arnaud Favier
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
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Duret D, Haftek-Terreau Z, Carretier M, Berki T, Ladavière C, Monier K, Bouvet P, Marvel J, Leverrier Y, Charreyre MT, Favier A. Labeling of native proteins with fluorescent RAFT polymer probes: application to the detection of a cell surface protein using flow cytometry. Polym Chem 2018. [DOI: 10.1039/c7py02064c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fluorescent RAFT polymer probes with an activated ester reactive end-group can be advantageously used to label native proteins.
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Affiliation(s)
- D. Duret
- Univ Lyon
- Université Lyon 1
- INSA de Lyon
- CNRS
- Laboratoire Ingénierie des Matériaux Polymères
| | | | - M. Carretier
- Univ Lyon
- Université Lyon 1
- INSA de Lyon
- CNRS
- Laboratoire Ingénierie des Matériaux Polymères
| | - T. Berki
- Univ Lyon
- Université Lyon 1
- INSA de Lyon
- CNRS
- Laboratoire Ingénierie des Matériaux Polymères
| | - C. Ladavière
- Univ Lyon
- Université Lyon 1
- INSA de Lyon
- CNRS
- Laboratoire Ingénierie des Matériaux Polymères
| | - K. Monier
- Univ Lyon
- ENS de Lyon
- CNRS
- Laboratoire Joliot-Curie
- USR3010
| | - P. Bouvet
- Univ Lyon
- ENS de Lyon
- CNRS
- Laboratoire Joliot-Curie
- USR3010
| | - J. Marvel
- Univ Lyon
- INSERM
- ENS de Lyon
- CNRS
- Université Lyon 1
| | | | - M.-T. Charreyre
- Univ Lyon
- Université Lyon 1
- INSA de Lyon
- CNRS
- Laboratoire Ingénierie des Matériaux Polymères
| | - A. Favier
- Univ Lyon
- Université Lyon 1
- INSA de Lyon
- CNRS
- Laboratoire Ingénierie des Matériaux Polymères
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Kumar S, Gomez EC, Chalabi-Dchar M, Rong C, Das S, Ugrinova I, Gaume X, Monier K, Mongelard F, Bouvet P. Integrated analysis of mRNA and miRNA expression in HeLa cells expressing low levels of Nucleolin. Sci Rep 2017; 7:9017. [PMID: 28827664 PMCID: PMC5567140 DOI: 10.1038/s41598-017-09353-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [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: 02/16/2017] [Accepted: 07/26/2017] [Indexed: 01/30/2023] Open
Abstract
Nucleolin is an essential protein that plays important roles in the regulation of cell cycle and cell proliferation. Its expression is up regulated in many cancer cells but its molecular functions are not well characterized. Nucleolin is present in the nucleus where it regulates gene expression at the transcriptional and post-transcriptional levels. Using HeLa cells depleted in nucleolin we performed an mRNA and miRNA transcriptomics analysis to identify biological pathways involving nucleolin. Bioinformatic analysis strongly points to a role of nucleolin in lipid metabolism, and in many signaling pathways. Down regulation of nucleolin is associated with lower level of cholesterol while the amount of fatty acids is increased. This could be explained by the decreased and mis-localized expression of the transcription factor SREBP1 and the down-regulation of enzymes involved in the beta-oxidation and degradation of fatty acids. Functional classification of the miRNA-mRNA target genes revealed that deregulated miRNAs target genes involved in apoptosis, proliferation and signaling pathways. Several of these deregulated miRNAs have been shown to control lipid metabolism. This integrated transcriptomic analysis uncovers new unexpected roles for nucleolin in metabolic regulation and signaling pathways paving the way to better understand the global function of nucleolin within the cell.
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Affiliation(s)
- Sanjeev Kumar
- BioCOS Life Sciences Private Limited, AECS Layout, B-Block, Singasandra Hosur Road SAAMI Building, 851/A, 3rd Floor, Bengaluru, Karnataka, India.
| | - Elizabhet Cruz Gomez
- Université de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS, 5286, Centre Léon Bérard, Lyon, France
| | - Mounira Chalabi-Dchar
- Université de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS, 5286, Centre Léon Bérard, Lyon, France
| | - Cong Rong
- Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Sadhan Das
- Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Iva Ugrinova
- Institute of Molecular Biology "Acad. Roumen Tsanev" Bulgarian Academy of Sciences "Acad. G Bonchev str. bl. 21, 1113, Sofia, Bulgaria
| | - Xavier Gaume
- Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Karine Monier
- Université de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS, 5286, Centre Léon Bérard, Lyon, France
| | - Fabien Mongelard
- Université de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS, 5286, Centre Léon Bérard, Lyon, France
- Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon, France
| | - Philippe Bouvet
- Université de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS, 5286, Centre Léon Bérard, Lyon, France.
- Université de Lyon, Ecole Normale Supérieure de Lyon, Lyon, France.
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Lacour W, Adjili S, Blaising J, Favier A, Monier K, Mezhoud S, Ladavière C, Place C, Pécheur EI, Charreyre MT. Virus Optical Imaging: Far-Red Fluorescent Lipid-Polymer Probes for an Efficient Labeling of Enveloped Viruses (Adv. Healthcare Mater. 16/2016). Adv Healthc Mater 2016. [DOI: 10.1002/adhm.201670087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- William Lacour
- Université Lyon; Ens de Lyon; CNRS; Laboratoire Joliot-Curie; F-69342 Lyon France
- Université Lyon; INSA Lyon; Université Claude Bernard; CNRS; Laboratoire Ingénierie des Matériaux Polymères; F-69621 Villeurbanne France
| | - Salim Adjili
- Université Lyon; Ens de Lyon; CNRS; Laboratoire Joliot-Curie; F-69342 Lyon France
- Université Lyon; INSA Lyon; Université Claude Bernard; CNRS; Laboratoire Ingénierie des Matériaux Polymères; F-69621 Villeurbanne France
| | - Julie Blaising
- Université Lyon; Univ Claude Bernard; INSERM U1052; CNRS 5286; Centre de Recherche en Cancérologie de Lyon (CRCL); F-69424 Lyon France
| | - Arnaud Favier
- Université Lyon; Ens de Lyon; CNRS; Laboratoire Joliot-Curie; F-69342 Lyon France
- Université Lyon; INSA Lyon; Université Claude Bernard; CNRS; Laboratoire Ingénierie des Matériaux Polymères; F-69621 Villeurbanne France
| | - Karine Monier
- Université Lyon; Ens de Lyon; CNRS; Laboratoire Joliot-Curie; F-69342 Lyon France
| | - Sarra Mezhoud
- Université Lyon; INSA Lyon; Université Claude Bernard; CNRS; Laboratoire Ingénierie des Matériaux Polymères; F-69621 Villeurbanne France
| | - Catherine Ladavière
- Université Lyon; INSA Lyon; Université Claude Bernard; CNRS; Laboratoire Ingénierie des Matériaux Polymères; F-69621 Villeurbanne France
| | - Christophe Place
- Université Lyon; Ens de Lyon; CNRS; Laboratoire Joliot-Curie; F-69342 Lyon France
- Université Lyon; Ens de Lyon; Université Claude Bernard; CNRS; Laboratoire de Physique; F-69342 Lyon France
| | - Eve-Isabelle Pécheur
- Université Lyon; Univ Claude Bernard; INSERM U1052; CNRS 5286; Centre de Recherche en Cancérologie de Lyon (CRCL); F-69424 Lyon France
| | - Marie-Thérèse Charreyre
- Université Lyon; Ens de Lyon; CNRS; Laboratoire Joliot-Curie; F-69342 Lyon France
- Université Lyon; INSA Lyon; Université Claude Bernard; CNRS; Laboratoire Ingénierie des Matériaux Polymères; F-69621 Villeurbanne France
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Lacour W, Adjili S, Blaising J, Favier A, Monier K, Mezhoud S, Ladavière C, Place C, Pécheur EI, Charreyre MT. Far-Red Fluorescent Lipid-Polymer Probes for an Efficient Labeling of Enveloped Viruses. Adv Healthc Mater 2016; 5:2032-44. [PMID: 27113918 PMCID: PMC7159338 DOI: 10.1002/adhm.201600091] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 01/26/2016] [Revised: 02/25/2016] [Indexed: 12/13/2022]
Abstract
Far-red emitting fluorescent lipid probes are desirable to label enveloped viruses, for their efficient tracking by optical microscopy inside autofluorescent cells. Most used probes are rapidly released from membranes, leading to fluorescence signal decay and loss of contrast. Here, water-soluble lipid-polymer probes are synthesized harboring hydrophilic or hydrophobic far-red emitting dyes, and exhibiting enhanced brightness. They efficiently label Hepatitis C Virus pseudotyped particles (HCVpp), more stably and reproducibly than commercial probes, and a strong fluorescence signal is observed with a high contrast. Labeling with such probes do not alter virion morphology, integrity, nor infectivity. Finally, it is shown by fluorescence microscopy that these probes enable efficient tracking of labeled HCVpp inside hepatocarcinoma cells used as model hepatocytes, in spite of their autofluorescence up to 700 nm. These novel fluorescent lipid-polymer probes should therefore enable a better characterization of early stages of infection of autofluorescent cells by enveloped viruses.
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Affiliation(s)
- William Lacour
- Université Lyon, Ens de Lyon, CNRS, Laboratoire Joliot-Curie, F-69342, Lyon, France
- Université Lyon, INSA Lyon, Université Claude Bernard, CNRS, Laboratoire Ingénierie des Matériaux Polymères, F-69621, Villeurbanne, France
| | - Salim Adjili
- Université Lyon, Ens de Lyon, CNRS, Laboratoire Joliot-Curie, F-69342, Lyon, France
- Université Lyon, INSA Lyon, Université Claude Bernard, CNRS, Laboratoire Ingénierie des Matériaux Polymères, F-69621, Villeurbanne, France
| | - Julie Blaising
- Université Lyon, Univ Claude Bernard, INSERM U1052, CNRS 5286, Centre de Recherche en Cancérologie de Lyon (CRCL), F-69424, Lyon, France
| | - Arnaud Favier
- Université Lyon, Ens de Lyon, CNRS, Laboratoire Joliot-Curie, F-69342, Lyon, France
- Université Lyon, INSA Lyon, Université Claude Bernard, CNRS, Laboratoire Ingénierie des Matériaux Polymères, F-69621, Villeurbanne, France
| | - Karine Monier
- Université Lyon, Ens de Lyon, CNRS, Laboratoire Joliot-Curie, F-69342, Lyon, France
| | - Sarra Mezhoud
- Université Lyon, INSA Lyon, Université Claude Bernard, CNRS, Laboratoire Ingénierie des Matériaux Polymères, F-69621, Villeurbanne, France
| | - Catherine Ladavière
- Université Lyon, INSA Lyon, Université Claude Bernard, CNRS, Laboratoire Ingénierie des Matériaux Polymères, F-69621, Villeurbanne, France
| | - Christophe Place
- Université Lyon, Ens de Lyon, CNRS, Laboratoire Joliot-Curie, F-69342, Lyon, France
- Université Lyon, Ens de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, F-69342, Lyon, France
| | - Eve-Isabelle Pécheur
- Université Lyon, Univ Claude Bernard, INSERM U1052, CNRS 5286, Centre de Recherche en Cancérologie de Lyon (CRCL), F-69424, Lyon, France
| | - Marie-Thérèse Charreyre
- Université Lyon, Ens de Lyon, CNRS, Laboratoire Joliot-Curie, F-69342, Lyon, France
- Université Lyon, INSA Lyon, Université Claude Bernard, CNRS, Laboratoire Ingénierie des Matériaux Polymères, F-69621, Villeurbanne, France
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Abstract
Nucleolin is present in diverse cellular compartments and is involved in a variety of cellular processes from nucleolar structure and function to intracellular trafficking, cell adhesion and migration. Recently, nucleolin has been localized at the mature centriole where it is involved in microtubule nucleation and anchoring. Although this new function of nucleolin linked to microtubule regulation has been identified, the global effects of nucleolin on microtubule dynamics have not been addressed yet. In the present study, we analyzed the roles of nucleolin protein levels on global microtubule dynamics by tracking the EB3 microtubule plus end binding protein in live cells. We have found that during microtubule growth phases, nucleolin affects both the speed and life time of polymerization and by analyzing catastrophe events, we showed that nucleolin reduces catastrophe frequency. This new property of nucleolin was then confirmed in a cold induced microtubule depolymerization experiment in which we have found that cold resistant microtubules were totally destabilized in nucleolin depleted cells. Altogether, our data demonstrate a new function of nucleolin on microtubule stabilization, thus bringing novel insights into understanding the multifunctional properties of nucleolin in healthy and cancer cells.
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Affiliation(s)
- Xavier Gaume
- Université de Lyon, Ecole normale Supérieure de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, Lyon, France
| | - Christophe Place
- Université de Lyon, Ecole Normale Supérieure de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, F-69342, Lyon, France
| | - Helene Delage
- Université de Lyon, Ecole normale Supérieure de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, Lyon, France
| | - Fabien Mongelard
- Université de Lyon, Ecole normale Supérieure de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, Lyon, France
| | - Karine Monier
- Université de Lyon, Ecole normale Supérieure de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, Lyon, France
| | - Philippe Bouvet
- Université de Lyon, Ecole normale Supérieure de Lyon, Centre de Recherche en Cancérologie de Lyon, Cancer Cell Plasticity Department, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, Lyon, France
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Adjili S, Favier A, Fargier G, Thomas A, Massin J, Monier K, Favard C, Vanbelle C, Bruneau S, Peyriéras N, Andraud C, Muriaux D, Charreyre MT. Biocompatible photoresistant far-red emitting, fluorescent polymer probes, with near-infrared two-photon absorption, for living cell and zebrafish embryo imaging. Biomaterials 2015; 46:70-81. [DOI: 10.1016/j.biomaterials.2014.12.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 11/29/2014] [Accepted: 12/20/2014] [Indexed: 12/12/2022]
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10
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Gaume X, Tassin AM, Ugrinova I, Mongelard F, Monier K, Bouvet P. Centrosomal nucleolin is required for microtubule network organization. Cell Cycle 2015; 14:902-19. [PMID: 25590348 PMCID: PMC4614815 DOI: 10.1080/15384101.2014.1000197] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [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: 09/25/2014] [Revised: 12/11/2014] [Accepted: 12/15/2014] [Indexed: 12/22/2022] Open
Abstract
Nucleolin is a pleiotropic protein involved in a variety of cellular processes. Although multipolar spindle formation has been observed after nucleolin depletion, the roles of nucleolin in centrosome regulation and functions have not been addressed. Here we report using immunofluorescence and biochemically purified centrosomes that nucleolin co-localized only with one of the centrioles during interphase which was further identified as the mature centriole. Upon nucleolin depletion, cells exhibited an amplification of immature centriole markers surrounded by irregular pericentrin staining; these structures were exempt from maturation markers and unable to nucleate microtubules. Furthermore, the microtubule network was disorganized in these cells, exhibiting frequent non-centrosomal microtubules. At the mature centriole a reduced kinetics in the centrosomal microtubule nucleation phase was observed in live silenced cells, as well as a perturbation of microtubule anchoring. Immunoprecipitation experiments showed that nucleolin belongs to protein complexes containing 2 key centrosomal proteins, γ-tubulin and ninein, involved in microtubule nucleation and anchoring steps. Altogether, our study uncovered a new role for nucleolin in restricting microtubule nucleation and anchoring at centrosomes in interphase cells.
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Affiliation(s)
- Xavier Gaume
- Université de Lyon; Ecole Normale Supérieure de Lyon; CNRS USR 3010; Laboratoire Joliot-Curie; Lyon, France
| | - Anne-Marie Tassin
- Institute for Integrative Biology of the Cell (I2BC); CEA, CNRS, Université Paris Sud; Gif sur Yvette, France
| | - Iva Ugrinova
- Institute of Molecular Biology “Acad. Roumen Tsanev”; Bulgarian Academy of Sciences; Sofia, Bulgaria
| | - Fabien Mongelard
- Université de Lyon; Ecole Normale Supérieure de Lyon; CNRS USR 3010; Laboratoire Joliot-Curie; Lyon, France
| | - Karine Monier
- Université de Lyon; Ecole Normale Supérieure de Lyon; CNRS USR 3010; Laboratoire Joliot-Curie; Lyon, France
| | - Philippe Bouvet
- Université de Lyon; Ecole Normale Supérieure de Lyon; CNRS USR 3010; Laboratoire Joliot-Curie; Lyon, France
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Das S, Cong R, Shandilya J, Senapati P, Moindrot B, Monier K, Delage H, Mongelard F, Kumar S, Kundu TK, Bouvet P. Characterization of nucleolin K88 acetylation defines a new pool of nucleolin colocalizing with pre-mRNA splicing factors. FEBS Lett 2013; 587:417-24. [PMID: 23353999 DOI: 10.1016/j.febslet.2013.01.035] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 12/17/2012] [Accepted: 01/14/2013] [Indexed: 11/22/2022]
Abstract
Nucleolin is a multifunctional protein that carries several post-translational modifications. We characterized nucleolin acetylation and developed antibodies specific to nucleolin K88 acetylation. Using this antibody we show that nucleolin is acetylated in vivo and is not localized in the nucleoli, but instead is distributed throughout the nucleoplasm. Immunofluorescence studies indicate that acetylated nucleolin is co-localized with the splicing factor SC35 and partially with Y12. Acetylated nucleolin is expressed in all tested proliferating cell types. Our findings show that acetylation defines a new pool of nucleolin which support a role for nucleolin in the regulation of mRNA maturation and transcription by RNA polymerase II.
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Affiliation(s)
- Sadhan Das
- Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS USR 3010, Laboratoire Joliot-Curie, Lyon, France
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12
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Greco A, Arata L, Soler E, Gaume X, Couté Y, Hacot S, Callé A, Monier K, Epstein AL, Sanchez JC, Bouvet P, Diaz JJ. Nucleolin interacts with US11 protein of herpes simplex virus 1 and is involved in its trafficking. J Virol 2012; 86:1449-57. [PMID: 22130536 PMCID: PMC3264372 DOI: 10.1128/jvi.06194-11] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Accepted: 11/18/2011] [Indexed: 02/06/2023] Open
Abstract
Herpes simplex virus type 1 (HSV-1) infection induces profound nucleolar modifications at the functional and organizational levels, including nucleolar invasion by several viral proteins. One of these proteins is US11, which exhibits several different functions and displays both cytoplasmic localization and clear nucleolar localization very similar to that of the major multifunctional nucleolar protein nucleolin. To determine whether US11 interacts with nucleolin, we purified US11 protein partners by coimmunoprecipitations using a tagged protein, Flag-US11. From extracts of cells expressing Flag-US11 protein, we copurified a protein of about 100 kDa that was further identified as nucleolin. In vitro studies have demonstrated that nucleolin interacts with US11 and that the C-terminal domain of US11, which is required for US11 nucleolar accumulation, is sufficient for interaction with nucleolin. This association was confirmed in HSV-1-infected cells. We found an increase in the nucleolar accumulation of US11 in nucleolin-depleted cells, thereby revealing that nucleolin could play a role in US11 nucleocytoplasmic trafficking through one-way directional transport out of the nucleolus. Since nucleolin is required for HSV-1 nuclear egress, the interaction of US11 with nucleolin may participate in the outcome of infection.
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Affiliation(s)
- Anna Greco
- Université de Lyon and Université Lyon 1, Lyon, France, and CNRS, UMR5534, Centre de Génétique et de Physiologie Moléculaire et Cellulaire, Villeurbanne, France
| | - Loredana Arata
- Université de Lyon and Université Lyon 1, Lyon, France, and CNRS, UMR5534, Centre de Génétique et de Physiologie Moléculaire et Cellulaire, Villeurbanne, France
| | - Eric Soler
- Université de Lyon and Université Lyon 1, Lyon, France, and CNRS, UMR5534, Centre de Génétique et de Physiologie Moléculaire et Cellulaire, Villeurbanne, France
| | - Xavier Gaume
- Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS USR 3010, Laboratoire Joliot-Curie, Lyon, France
| | - Yohann Couté
- Geneva Proteomics Center, Central Clinical Chemistry Laboratory, Geneva University Hospital, Genève, Switzerland
| | - Sabine Hacot
- Université de Lyon and Université Lyon 1, Lyon, France, and CNRS, UMR5534, Centre de Génétique et de Physiologie Moléculaire et Cellulaire, Villeurbanne, France
- CRCL Inserm U1052, CNRS UMR 5286, Centre Léon Bérard, Lyon, France
| | - Aleth Callé
- Université de Lyon and Université Lyon 1, Lyon, France, and CNRS, UMR5534, Centre de Génétique et de Physiologie Moléculaire et Cellulaire, Villeurbanne, France
| | - Karine Monier
- Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS USR 3010, Laboratoire Joliot-Curie, Lyon, France
| | - Alberto L. Epstein
- Université de Lyon and Université Lyon 1, Lyon, France, and CNRS, UMR5534, Centre de Génétique et de Physiologie Moléculaire et Cellulaire, Villeurbanne, France
| | - Jean-Charles Sanchez
- Human Protein Sciences, Faculty of Medicine, Geneva University, Geneva, Switzerland
| | - Philippe Bouvet
- Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS USR 3010, Laboratoire Joliot-Curie, Lyon, France
| | - Jean-Jacques Diaz
- Université de Lyon and Université Lyon 1, Lyon, France, and CNRS, UMR5534, Centre de Génétique et de Physiologie Moléculaire et Cellulaire, Villeurbanne, France
- CRCL Inserm U1052, CNRS UMR 5286, Centre Léon Bérard, Lyon, France
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13
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Berguiga L, Roland T, Monier K, Elezgaray J, Argoul F. Amplitude and phase images of cellular structures with a scanning surface plasmon microscope. Opt Express 2011; 19:6571-6586. [PMID: 21451685 DOI: 10.1364/oe.19.006571] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Imaging cellular internal structure at nanometer scale axial resolution with non invasive microscopy techniques has been a major technical challenge since the nineties. We propose here a complement to fluorescence based microscopies with no need of staining the biological samples, based on a Scanning Surface Plasmon Microscope (SSPM). We describe the advantages of this microscope, namely the possibility of both amplitude and phase imaging and, due to evanescent field enhancement by the surface plasmon resonance, a very high resolution in Z scanning (Z being the axis normal to the sample). We show for fibroblast cells (IMR90) that SSPM offers an enhanced detection of index gradient regions, and we conclude it is very well suited to discriminate regions of variable density in biological media such as cell compartments, nucleus, nucleoli and membranes.
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Affiliation(s)
- L Berguiga
- USR3010, UMR 5672, CNRS, Ecole Normale Supérieure de Lyon, Lyon, France
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14
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Grant J, Verrill C, Coustham V, Arneodo A, Palladino F, Monier K, Khalil A. Perinuclear distribution of heterochromatin in developing C. elegans embryos. Chromosome Res 2010; 18:873-85. [PMID: 21116703 DOI: 10.1007/s10577-010-9175-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Accepted: 11/16/2010] [Indexed: 10/18/2022]
Abstract
Specific nuclear domains are nonrandomly positioned within the nuclear space, and this preferential positioning has been shown to play an important role in genome activity and stability. Well-known examples include the organization of repetitive DNA in telomere clusters or in the chromocenter of Drosophila and mammalian cells, which may provide a means to control the availability of general repressors, such as the heterochromatin protein 1 (HP1). We have specifically characterized the intranuclear positioning of in vivo fluorescence of the Caenorhabditis elegans HP1 homologue HPL-2 as a marker for heterochromatin domains in developing embryos. For this purpose, the wavelet transform modulus maxima (WTMM) segmentation method was generalized and adapted to segment the small embryonic cell nuclei in three dimensions. The implementation of a radial distribution algorithm revealed a preferential perinuclear positioning of HPL-2 fluorescence in wild-type embryos compared with the diffuse and homogeneous nuclear fluorescence observed in the lin-13 mutants. For all other genotypes analyzed, the quantitative analysis highlighted various degrees of preferential HPL-2 positioning at the nuclear periphery, which directly correlates with the number of HPL-2 foci previously counted on 2D projections. Using a probabilistic 3D cell nuclear model, we found that any two nuclei having the same number of foci, but with a different 3D probabilistic positioning scheme, can have significantly different counts in the 2D maximum projection, thus showing the deceptive limitations of using techniques of 2D maximum projection foci counts. By this approach, a strong perinuclear positioning of HPL-2 foci was brought into light upon inactivation of conserved chromatin-associated proteins, including the HAT cofactor TRAPP.
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Affiliation(s)
- Jeremy Grant
- Department of Mathematics and Statistics, University of Maine, Orono, ME 04469, USA
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15
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Ugrinova I, Monier K, Ivaldi C, Thiry M, Storck S, Mongelard F, Bouvet P. Inactivation of nucleolin leads to nucleolar disruption, cell cycle arrest and defects in centrosome duplication. BMC Mol Biol 2007; 8:66. [PMID: 17692122 PMCID: PMC1976620 DOI: 10.1186/1471-2199-8-66] [Citation(s) in RCA: 153] [Impact Index Per Article: 9.0] [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: 06/15/2007] [Accepted: 08/10/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Nucleolin is a major component of the nucleolus, but is also found in other cell compartments. This protein is involved in various aspects of ribosome biogenesis from transcription regulation to the assembly of pre-ribosomal particles; however, many reports suggest that it could also play an important role in non nucleolar functions. To explore nucleolin function in cell proliferation and cell cycle regulation we used siRNA to down regulate the expression of nucleolin. RESULTS We found that, in addition to the expected effects on pre-ribosomal RNA accumulation and nucleolar structure, the absence of nucleolin results in a cell growth arrest, accumulation in G2, and an increase of apoptosis. Numerous nuclear alterations, including the presence of micronuclei, multiple nuclei or large nuclei are also observed. In addition, a large number of mitotic cells showed a defect in the control of centrosome duplication, as indicated by the presence of more than 2 centrosomes per cell associated with a multipolar spindle structure in the absence of nucleolin. This phenotype is very similar to that obtained with the inactivation of another nucleolar protein, B23. CONCLUSION Our findings uncovered a new role for nucleolin in cell division, and highlight the importance of nucleolar proteins for centrosome duplication.
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Affiliation(s)
- Iva Ugrinova
- Laboratory Joliot-Curie, CNRS USR 3010, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
- Laboratory of molecular biology of the cell, CNRS UMR 5239, IFR128 Biosciences, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
| | - Karine Monier
- Laboratory of molecular biology of the cell, CNRS UMR 5239, IFR128 Biosciences, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
| | - Corinne Ivaldi
- Laboratory Joliot-Curie, CNRS USR 3010, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
- Laboratory of molecular biology of the cell, CNRS UMR 5239, IFR128 Biosciences, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
| | - Marc Thiry
- Laboratory of Cell Biology, Department of Life Sciences, Faculty of Sciences, University of Liege, Liege, Belgium
| | - Sébastien Storck
- Laboratory Joliot-Curie, CNRS USR 3010, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
- Laboratory of molecular biology of the cell, CNRS UMR 5239, IFR128 Biosciences, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
| | - Fabien Mongelard
- Laboratory Joliot-Curie, CNRS USR 3010, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
- Laboratory of molecular biology of the cell, CNRS UMR 5239, IFR128 Biosciences, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
| | - Philippe Bouvet
- Laboratory Joliot-Curie, CNRS USR 3010, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
- Laboratory of molecular biology of the cell, CNRS UMR 5239, IFR128 Biosciences, University of Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, Lyon, France
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16
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Abstract
Confinement of enzymatic reactions to nuclear and chromosomal subdomains regulates functional organization of the nucleus. Aurora-B kinase regulates cell-cycle-dependent phosphorylation of chromosomal substrates through sequential localization to a series of sites on chromosomes and the mitotic spindle. In G2 nuclei, Aurora-B recruitment to heterochromatin restricts histone H3S10 phosphorylation to a domain around centromeres (pericentromeres). However, no intrinsic chromosomal determinants have been implicated in Aurora-B recruitment to interphase pericentromeres. Using cyclin B1 as a cell-cycle marker, we found that the great majority of nuclei exhibiting H3S10 phosphorylated foci were positive for cyclin B1, thus revealing that H3S10 phosphorylation arises at pericentromeres during late S phase and persists in G2. By immunofluorescent in situ hybridization, Aurora-B and H3S10 phosphorylated foci were found more frequently at larger pericentromeres than at smaller ones, revealing a preferential phosphorylation of pericentromeres, exhibiting a high density of methyl cytosines. Disruption of DNA methylation inhibited pericentromeric Aurora-B targeting and H3S10 phosphorylation in G2 nuclei, thus demonstrating the role of DNA methylation in Aurora-B targeting to pericentromeres. These results favour the idea that DNA methylation maintains a local environment essential for regulating the functional properties of sub-chromosomal domains during S-G2 progression.
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Affiliation(s)
- Karine Monier
- The Scripps Research Institute, Department of Cell Biology, CB163, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.
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17
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Coustham V, Bedet C, Monier K, Schott S, Karali M, Palladino F. The C. elegans HP1 homologue HPL-2 and the LIN-13 zinc finger protein form a complex implicated in vulval development. Dev Biol 2006; 297:308-22. [PMID: 16890929 DOI: 10.1016/j.ydbio.2006.04.474] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Revised: 04/10/2006] [Accepted: 04/11/2006] [Indexed: 12/31/2022]
Abstract
HP1 proteins are essential components of heterochromatin and contribute to the transcriptional repression of euchromatic genes via the recruitment to specific promoters by corepressor proteins including TIF1 and Rb. The Caenorhabditis elegans HP1 homologue HPL-2 acts in the "synMuv" (synthetic multivulval) pathway, which defines redundant negative regulators of a Ras signaling cascade required for vulval induction. Several synMuv genes encode for chromatin-associated proteins involved in transcriptional regulation, including Rb and components of the Mi-2/NuRD and TIP60/NuA4 chromatin remodeling complexes. Here, we show that HPL-2 physically interacts in vitro and in vivo with the multiple zinc finger protein LIN-13, another member of the synMuv pathway. A variant of the conserved PXVXL motif found in many HP1-interacting proteins mediates LIN-13 binding to the CSD of HPL-2. We further show by in vivo localization studies that LIN-13 is required for HPL-2 recruitment in nuclear foci. Our data suggest that the LIN-13/HPL-2 complex may physically link a subset of the Rb related synMuv proteins to chromatin.
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Affiliation(s)
- Vincent Coustham
- Laboratoire de Biologie Moleculaire de la Cellule, Ecole Normale Supérieure de Lyon, 69007 Lyon, France
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18
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Monier K, Heliot L, Rougeulle C, Heard E, Robert-Nicoud M, Vourc'h C, Bensimon A, Usson Y. Improvement of FISH mapping resolution on combed DNA molecules by iterative constrained deconvolution: a quantitative study. Cytogenet Cell Genet 2001; 92:59-62. [PMID: 11306797 DOI: 10.1159/000056869] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Image restoration approaches, such as digital deconvolution, are becoming widely used for improving the quality of microscopic images. However, no quantification of the gain in resolution of fluorescence images is available. We show that, after iterative constrained deconvolution, fluorescent cosmid signals appear to be 25% smaller, and 1.2-kb fragment signals on combed molecules faithfully display the expected length.
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Affiliation(s)
- K Monier
- Laboratoire DyOGen, Unité INSERM U309, Institut Albert Bonniot, La Tronche, France.
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19
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Abstract
The specification of metazoan centromeres does not depend strictly on centromeric DNA sequences, but also requires epigenetic factors. The mechanistic basis for establishing a centromeric "state" on the DNA remains unclear. In this work, we have directly examined replication timing of the prekinetochore domain of human chromosomes. Kinetochores were labeled by expression of epitope-tagged CENP-A, which stably marks prekinetochore domains in human cells. By immunoprecipitating CENP-A mononucleosomes from synchronized cells pulsed with [(3)H]thymidine we demonstrate that CENP-A-associated DNA is replicated in mid-to-late S phase. Cytological analysis of DNA replication further demonstrated that centromeres replicate asynchronously in parallel with numerous other genomic regions. In contrast, quantitative Western blot analysis demonstrates that CENP-A protein synthesis occurs later, in G2. Quantitative fluorescence microscopy and transient transfection in the presence of aphidicolin, an inhibitor of DNA replication, show that CENP-A can assemble into centromeres in the absence of DNA replication. Thus, unlike most genomic chromatin, histone synthesis and assembly are uncoupled from DNA replication at the kinetochore. Uncoupling DNA replication from CENP-A synthesis suggests that regulated chromatin assembly or remodeling could play a role in epigenetic centromere propagation.
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Affiliation(s)
- R D Shelby
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California 92037, USA
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20
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Abstract
The nucleus is known to be compartmentalized into units of function, but the processes leading to the spatial organization of chromosomes and nuclear compartments are not yet well defined. Here we report direct quantitative analysis of the global structural perturbations of interphase chromosome and interchromosome domain distribution caused by infection with herpes simplex virus-1 (HSV-1). Our results show that the peripheral displacement of host chromosomes that correlates with expansion of the viral replication compartment (VRC) is coupled to a twofold increase in nuclear volume. Live cell dynamic measurements suggest that viral compartment formation is driven by the functional activity of viral components and underscore the significance of spatial regulation of nuclear activities.
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Affiliation(s)
- K Monier
- Department of Cell Biology, Division of Virology, The Scripps Research Institute, La Jolla, California 92037, USA
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21
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Monier K, Michalet X, Lamartine J, Schurra C, Heitzmann F, Yin L, Cinti R, Sylla BS, Creaven M, Porta G, Vourc'h C, Robert-Nicoud M, Bensimon A, Romeo G. High-resolution mapping of the X-linked lymphoproliferative syndrome region by FISH on combed DNA. Cytogenet Cell Genet 2000; 81:259-64. [PMID: 9730614 DOI: 10.1159/000015041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
X-linked lymphoproliferative syndrome is an inherited immunodeficiency for which the responsible gene is currently unknown. Several megabase-sized deleted regions mapping to Xq25 have been identified in XLP patients, and more recently a 130-kb deletion has been reported (Lamartine et al., 1996; Lanyi et al., 1996). To establish a physical map of this deleted region and to identify the XLP gene, two cosmid contigs were established (Lamartine et al., 1996). However, the physical map of this region is still uncompleted and controversial and three points remain unsolved: (1) the centromeric-telomeric orientation of the whole region, (2) the relative orientation of the two contigs, and (3) the size of the gap between the two contigs. To provide a definitive answer to these questions, high-resolution mapping by fluorescence in situ hybridization on combed DNA and molecular approaches were combined to establish the physical map of the XLP region over 600 kb. Our results identified a gap of 150 kb between the two contigs, established the relative orientation of one contig to the other, and determine the centromeric-telomeric orientation of the whole region. Our results show that the order of the marker over this region is: cen.1D10T7-DF83-DXS982.tel.
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Affiliation(s)
- K Monier
- Laboratoire DYOGEN, Unité INSERM U309, Institut Albert Bonniot, La Tronche, France.
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22
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Monier K, Hazzouri M, Mongelard F, Rousseaux S, Vourc'h C, Robert-Nicoud M. Cartographie à haute résolution par hybridation in situ fluorescente sur fibres d'ADN décondensées. Med Sci (Paris) 1997. [DOI: 10.4267/10608/550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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23
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Monier K, Usson Y, Mongelard F, Szepetowski P, Robert-Nicoud M, Vourc'h C. Metaphase and interphase mapping by FISH: improvement of chromosome banding and signal resolution in interphase nuclei by means of iterative deconvolution. Cytogenet Cell Genet 1996; 72:200-4. [PMID: 8978776 DOI: 10.1159/000134189] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
FISH images obtained with conventional epifluorescence microscopes are always blurred by glare and out of focus light emissions. In order to restore high contrast images, a procedure based on a modelling of the optical system in the microscope was developed and used for the processing of images acquired with a cooled CCD camera mounted on a fluorescence microscope. This procedure was tested on images of both mouse and human chromosomes stained with DAP1 and on images of interphase nuclei hybridized with pairs of cosmid probes. This method improves the definition and the sharpness of the DAPI G-banding and thus facilitates and speeds up the identification of chromosomes. When performed on images of interphase cell nuclei, this procedure allows the discrimination of fluorescent signals which appear partially overlapping on raw images. This significant improvement of spatial resolution is of particular interest for ordering sets of probes on DNA fibers.
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Affiliation(s)
- K Monier
- DyOGen, UPRES 950456, Institut Albert Bonniot, Faculté de Médecine de Grenoble, Universié Joseph Fourier, La Tronche, France
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