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Krane N, Turco E, Bernhardt A, Jacob D, Gandus G, Passerone D, Luisier M, Juríček M, Fasel R, Fernández-Rossier J, Ruffieux P. Exchange Interactions and Intermolecular Hybridization in a Spin- 1/ 2 Nanographene Dimer. Nano Lett 2023; 23:9353-9359. [PMID: 37819646 DOI: 10.1021/acs.nanolett.3c02633] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
Phenalenyl is a radical nanographene with a triangular shape hosting an unpaired electron with spin S = 1/2. The open-shell nature of the phenalenyl is expected to be retained in covalently bonded networks. As a first step, we report synthesis of the phenalenyl dimer by combining in-solution synthesis and on-surface activation and its characterization on Au(111) and on a NaCl decoupling layer by means of inelastic electron tunneling spectroscopy (IETS). IETS shows inelastic steps that are identified as singlet-triplet excitation arising from interphenalenyl exchange. Spin excitation energies with and without the NaCl decoupling layer are 48 and 41 meV, respectively, indicating significant renormalization due to exchange with Au(111) electrons. Furthermore, third-neighbor hopping-induced interphenalenyl hybridization is fundamental to explaining the position-dependent bias asymmetry of the inelastic steps and activation of kinetic interphenalenyl exchange. Our results pave the way for bottom-up synthesis of S = 1/2 spin-lattices with large exchange interactions.
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Affiliation(s)
- N Krane
- nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland
| | - E Turco
- nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland
| | - A Bernhardt
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - D Jacob
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Universidad del País Vasco UPV/EHU, Av. Tolosa 72, E-20018 San Sebastián, Spain
- Basque Foundation for Science, IKERBASQUE, Plaza Euskadi 5, E-48009 Bilbao, Spain
| | - G Gandus
- Integrated Systems Laboratory, ETH Zürich, Gloriastrasse 35, 8092 Zürich, Switzerland
| | - D Passerone
- nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland
| | - M Luisier
- Integrated Systems Laboratory, ETH Zürich, Gloriastrasse 35, 8092 Zürich, Switzerland
| | - M Juríček
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - R Fasel
- nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - J Fernández-Rossier
- International Iberian Nanotechnology Laboratory (INL), Avenida Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - P Ruffieux
- nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland
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2
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Fernandez L, Blanco-Rey M, Castrillo-Bodero R, Ilyn M, Ali K, Turco E, Corso M, Ormaza M, Gargiani P, Valbuena MA, Mugarza A, Moras P, Sheverdyaeva PM, Kundu AK, Jugovac M, Laubschat C, Ortega JE, Schiller F. Correction: Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds. Nanoscale 2021; 13:20704. [PMID: 34874396 DOI: 10.1039/d1nr90260a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Correction for 'Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds' by L. Fernandez et al., Nanoscale, 2020, 12, 22258-22267, DOI: 10.1039/D0NR04964F.
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Affiliation(s)
- L Fernandez
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Blanco-Rey
- Universidad del País Vasco UPV-EHU, Dpto. de Polímeros y Materiales Avanzados: Física, Química y Tecnología, 20018 San Sebastián, Spain
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
| | - R Castrillo-Bodero
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ilyn
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - K Ali
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - E Turco
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Corso
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ormaza
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
| | - P Gargiani
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, 08290 Cerdanyola del Vallès, Spain
| | - M A Valbuena
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- IMDEA Nanociencia, 28049 Madrid, Spain
| | - A Mugarza
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08070 Barcelona, Spain
| | - P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - P M Sheverdyaeva
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - Asish K Kundu
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - M Jugovac
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - C Laubschat
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
| | - J E Ortega
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - F Schiller
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
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3
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Fernandez L, Blanco-Rey M, Castrillo-Bodero R, Ilyn M, Ali K, Turco E, Corso M, Ormaza M, Gargiani P, Valbuena MA, Mugarza A, Moras P, Sheverdyaeva PM, Kundu AK, Jugovac M, Laubschat C, Ortega JE, Schiller F. Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds. Nanoscale 2020; 12:22258-22267. [PMID: 33146198 DOI: 10.1039/d0nr04964f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
One-atom-thick rare-earth/noble metal (RE-NM) compounds are attractive materials to investigate two-dimensional magnetism, since they are easy to synthesize into a common RE-NM2 structure with high crystal perfection. Here we perform a comparative study of the GdAu2, HoAu2, and YbAu2 monolayer compounds grown on Au(111). We find the same atomic lattice quality and moiré superlattice periodicity in the three cases, but different electronic properties and magnetism. The YbAu2 monolayer reveals the characteristic electronic signatures of a mixed-valence configuration in the Yb atom. In contrast, GdAu2 and HoAu2 show the trivalent character of the rare-earth and ferromagnetic transitions below 22 K. Yet, the GdAu2 monolayer has an in-plane magnetic easy-axis, versus the out-of-plane one in HoAu2. The electronic bands of the two trivalent compounds are very similar, while the divalent YbAu2 monolayer exhibits different band features. In the latter, a strong 4f-5d hybridization is manifested in neatly resolved avoided crossings near the Fermi level. First principles theory points to a residual presence of empty 4f states, explaining the fluctuating valence of Yb in the YbAu2 monolayer.
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Affiliation(s)
- L Fernandez
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Blanco-Rey
- Universidad del País Vasco UPV-EHU, Dpto. de Polímeros y Materiales Avanzados: Física, Química y Tecnología, 20018 San Sebastián, Spain
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
| | - R Castrillo-Bodero
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ilyn
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - K Ali
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - E Turco
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Corso
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ormaza
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
| | - P Gargiani
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, 08290 Cerdanyola del Vallès, Spain
| | - M A Valbuena
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- IMDEA Nanociencia, 28049 Madrid, Spain
| | - A Mugarza
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08070 Barcelona, Spain
| | - P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - P M Sheverdyaeva
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - Asish K Kundu
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - M Jugovac
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - C Laubschat
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
| | - J E Ortega
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - F Schiller
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
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4
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Sant K, Palcu DV, Turco E, Di Stefano A, Baldassini N, Kouwenhoven T, Kuiper KF, Krijgsman W. Litho- and biostratigraphic data of lower-middle Miocene sections in the Transylvanian basin and SE Carpathian Foredeep (Romania). Data Brief 2019; 24:103904. [PMID: 31193225 PMCID: PMC6525294 DOI: 10.1016/j.dib.2019.103904] [Citation(s) in RCA: 1] [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: 08/31/2018] [Revised: 03/16/2019] [Accepted: 03/26/2019] [Indexed: 11/29/2022] Open
Abstract
Litho- and biostratigraphic data are provided of 5 stratigraphic sections in Romania covering the “Badenian” marine flooding that occurred in the Central Paratethys during the middle Miocene (Langhian). The dataset includes stratigraphic logs and descriptions of the profiles, and biostratigraphic analyses on calcareous nannofossils and foraminifera. In addition, characteristic stratigraphic features and representative fossils, including tiny Streptochilus foraminifera in the Campiniţa section in the SE Carpathian Foredeep, are presented in photographs. The data show that the flooding is characterized by the sudden abundance of Langhian calcareous nannofossils and foraminifera with a strong Mediterranean affinity.
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Affiliation(s)
- K Sant
- Paleomagnetic Laboratory Fort Hoofddijk, Utrecht University, Utrecht, the Netherlands
| | - D V Palcu
- Paleomagnetic Laboratory Fort Hoofddijk, Utrecht University, Utrecht, the Netherlands
| | - E Turco
- Department of Chemistry, Life Sciences and Environmental Sustainability, Parma University, Parma, Italy
| | - A Di Stefano
- Department of Biological, Geological and Environmental Sciences, Catania University, Catania, Italy
| | - N Baldassini
- Department of Biological, Geological and Environmental Sciences, Catania University, Catania, Italy
| | - T Kouwenhoven
- Department of Geosciences, Stratigraphy-Paleontology, Heidelberglaan 2, 3584 CS Utrecht, the Netherlands
| | - K F Kuiper
- Department of Earth Sciences, Vrije Universiteit Amsterdam, the Netherlands
| | - W Krijgsman
- Paleomagnetic Laboratory Fort Hoofddijk, Utrecht University, Utrecht, the Netherlands
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5
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Giorgio I, Harrison P, dell'Isola F, Alsayednoor J, Turco E. Wrinkling in engineering fabrics: a comparison between two different comprehensive modelling approaches. Proc Math Phys Eng Sci 2018; 474:20180063. [PMID: 30220866 PMCID: PMC6127399 DOI: 10.1098/rspa.2018.0063] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 07/12/2018] [Indexed: 11/12/2022] Open
Abstract
We consider two 'comprehensive' modelling approaches for engineering fabrics. We distinguish the two approaches using the terms 'semi-discrete' and 'continuum', reflecting their natures. We demonstrate a fitting procedure, used to identify the constitutive parameters of the continuum model from predictions of the semi-discrete model, the parameters of which are in turn fitted to experimental data. We, then, check the effectiveness of the continuum model by verifying the correspondence between semi-discrete and continuum model predictions using test cases not previously used in the identification process. Predictions of both modelling approaches are compared against full-field experimental kinematic data, obtained using stereoscopic digital image correlation techniques, and also with measured force data. Being a reduced order model and being implemented in an implicit rather than an explicit finite-element code, the continuum model requires significantly less computational power than the semi-discrete model and could therefore be used to more efficiently explore the mechanical response of engineering fabrics.
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Affiliation(s)
- I Giorgio
- DISG, Università di Roma La Sapienza, Rome, Italy.,International Research Center, M&MoCS, L'Aquila, Italy
| | - P Harrison
- School of Engineering, University of Glasgow, Glasgow, UK.,International Research Center, M&MoCS, L'Aquila, Italy
| | - F dell'Isola
- DISG, Università di Roma La Sapienza, Rome, Italy.,International Research Center, M&MoCS, L'Aquila, Italy
| | - J Alsayednoor
- School of Engineering, University of Glasgow, Glasgow, UK
| | - E Turco
- Department of Architecture, Design and Urban planning, University of Sassari, Alghero, Italy.,International Research Center, M&MoCS, L'Aquila, Italy
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6
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Rocca S, D’Anna F, Fusella F, Orso F, Ala U, Provero P, Taverna D, Turco E, Brancaccio M. PO-356 MicroRNA mediated regulation of morgana, a new oncosuppressor in chronic myeloid leukaemia. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.868] [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: 11/04/2022] Open
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Seclì L, Fusella F, Fragale G, Rubinetto C, Rocca S, Turco E, Brancaccio M. PO-237 Neutralising extracellular morgana impairs breast tumour growth and migration. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.753] [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: 11/03/2022] Open
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Abstract
A nonlinear two-dimensional (2D) continuum with a latent internal structure is introduced as a coarse model of a plane network of beams which, in turn, is assumed as a model of a pantographic structure made up by two families of equispaced beams, superimposed and connected by pivots. The deformation measures of the beams of the network and that of the 2D body are introduced and the former are expressed in terms of the latter by making some kinematical assumptions. The expressions for the strain and kinetic energy densities of the network are then introduced and given in terms of the kinematic quantities of the 2D continuum. To account for the modelling abilities of the 2D continuum in the linear range, the eigenmode and eigenfrequencies of a given specimen are determined. The buckling and post-buckling behaviour of the same specimen, subjected to two different loading conditions are analysed as tests in the nonlinear range. The problems have been solved numerically by means of the COMSOL Multiphysics finite element software.
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Affiliation(s)
- I. Giorgio
- International Research Center, M&MoCS, L’Aquila, Italy
| | - N. L. Rizzi
- International Research Center, M&MoCS, L’Aquila, Italy
- Department of Architecture, Roma Tre University, Rome, Italy
| | - E. Turco
- International Research Center, M&MoCS, L’Aquila, Italy
- Department of Architecture, Design and Urban planning, University of Sassari, Alghero, Italy
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9
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Longa C, Nicola L, Antonielli L, Mescalchin E, Zanzotti R, Turco E, Pertot I. Soil microbiota respond to green manure in organic vineyards. J Appl Microbiol 2017; 123:1547-1560. [DOI: 10.1111/jam.13606] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 09/05/2017] [Accepted: 10/03/2017] [Indexed: 02/04/2023]
Affiliation(s)
- C.M.O. Longa
- Research and Innovation Centre Fondazione Edmund Mach (FEM) San Michele all' Adige (TN) Italy
| | - L. Nicola
- Research and Innovation Centre Fondazione Edmund Mach (FEM) San Michele all' Adige (TN) Italy
| | - L. Antonielli
- Research and Innovation Centre Fondazione Edmund Mach (FEM) San Michele all' Adige (TN) Italy
| | - E. Mescalchin
- Research and Innovation Centre Fondazione Edmund Mach (FEM) San Michele all' Adige (TN) Italy
| | - R. Zanzotti
- Research and Innovation Centre Fondazione Edmund Mach (FEM) San Michele all' Adige (TN) Italy
| | - E. Turco
- Research and Innovation Centre Fondazione Edmund Mach (FEM) San Michele all' Adige (TN) Italy
| | - I. Pertot
- Research and Innovation Centre Fondazione Edmund Mach (FEM) San Michele all' Adige (TN) Italy
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10
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Sgrò F, Bianchi FT, Falcone M, Pallavicini G, Gai M, Chiotto AMA, Berto GE, Turco E, Chang YJ, Huttner WB, Di Cunto F. Tissue-specific control of midbody microtubule stability by Citron kinase through modulation of TUBB3 phosphorylation. Cell Death Differ 2015; 23:801-13. [PMID: 26586574 DOI: 10.1038/cdd.2015.142] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 09/13/2015] [Accepted: 09/29/2015] [Indexed: 01/02/2023] Open
Abstract
Cytokinesis, the physical separation of daughter cells at the end of cell cycle, is commonly considered a highly stereotyped phenomenon. However, in some specialized cells this process may involve specific molecular events that are still largely unknown. In mammals, loss of Citron-kinase (CIT-K) leads to massive cytokinesis failure and apoptosis only in neuronal progenitors and in male germ cells, resulting in severe microcephaly and testicular hypoplasia, but the reasons for this specificity are unknown. In this report we show that CIT-K modulates the stability of midbody microtubules and that the expression of tubulin β-III (TUBB3) is crucial for this phenotype. We observed that TUBB3 is expressed in proliferating CNS progenitors, with a pattern correlating with the susceptibility to CIT-K loss. More importantly, depletion of TUBB3 in CIT-K-dependent cells makes them resistant to CIT-K loss, whereas TUBB3 overexpression increases their sensitivity to CIT-K knockdown. The loss of CIT-K leads to a strong decrease in the phosphorylation of S444 on TUBB3, a post-translational modification associated with microtubule stabilization. CIT-K may promote this event by interacting with TUBB3 and by recruiting at the midbody casein kinase-2α (CK2α) that has previously been reported to phosphorylate the S444 residue. Indeed, CK2α is lost from the midbody in CIT-K-depleted cells. Moreover, expression of the nonphosphorylatable TUBB3 mutant S444A induces cytokinesis failure, whereas expression of the phospho-mimetic mutant S444D rescues the cytokinesis failure induced by both CIT-K and CK2α loss. Altogether, our findings reveal that expression of relatively low levels of TUBB3 in mitotic cells can be detrimental for their cytokinesis and underscore the importance of CIT-K in counteracting this event.
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Affiliation(s)
- F Sgrò
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - F T Bianchi
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - M Falcone
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - G Pallavicini
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - M Gai
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - A M A Chiotto
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - G E Berto
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - E Turco
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - Y J Chang
- Max-Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - W B Huttner
- Max-Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - F Di Cunto
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy.,Neuroscience Institute of Turin, Turin, Italy
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11
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Fossati G, Morini R, Corradini I, Antonucci F, Trepte P, Edry E, Sharma V, Papale A, Pozzi D, Defilippi P, Meier JC, Brambilla R, Turco E, Rosenblum K, Wanker EE, Ziv NE, Menna E, Matteoli M. Reduced SNAP-25 increases PSD-95 mobility and impairs spine morphogenesis. Cell Death Differ 2015; 22:1425-36. [PMID: 25678324 DOI: 10.1038/cdd.2014.227] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 10/22/2014] [Accepted: 11/26/2014] [Indexed: 12/24/2022] Open
Abstract
Impairment of synaptic function can lead to neuropsychiatric disorders collectively referred to as synaptopathies. The SNARE protein SNAP-25 is implicated in several brain pathologies and, indeed, brain areas of psychiatric patients often display reduced SNAP-25 expression. It has been recently found that acute downregulation of SNAP-25 in brain slices impairs long-term potentiation; however, the processes through which this occurs are still poorly defined. We show that in vivo acute downregulation of SNAP-25 in CA1 hippocampal region affects spine number. Consistently, hippocampal neurons from SNAP-25 heterozygous mice show reduced densities of dendritic spines and defective PSD-95 dynamics. Finally, we show that, in brain, SNAP-25 is part of a molecular complex including PSD-95 and p140Cap, with p140Cap being capable to bind to both SNAP-25 and PSD-95. These data demonstrate an unexpected role of SNAP-25 in controlling PSD-95 clustering and open the possibility that genetic reductions of the protein levels - as occurring in schizophrenia - may contribute to the pathology through an effect on postsynaptic function and plasticity.
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Affiliation(s)
- G Fossati
- 1] Department of Biotechnology and Translational Medicine, University of Milan, Milano 20129, Italy [2] Humanitas Clinical and Research Center, Laboratory of Pharmacology and Brain Pathology, Via Manzoni 56, Rozzano, 20089 Milano, Italy
| | - R Morini
- 1] Department of Biotechnology and Translational Medicine, University of Milan, Milano 20129, Italy [2] Humanitas Clinical and Research Center, Laboratory of Pharmacology and Brain Pathology, Via Manzoni 56, Rozzano, 20089 Milano, Italy
| | - I Corradini
- 1] Department of Biotechnology and Translational Medicine, University of Milan, Milano 20129, Italy [2] Istituto di Neuroscienze del CNR, Milano 20129, Italy
| | - F Antonucci
- 1] Department of Biotechnology and Translational Medicine, University of Milan, Milano 20129, Italy [2] Istituto di Neuroscienze del CNR, Milano 20129, Italy
| | - P Trepte
- Neuroproteomics, Max Delbrueck Center for Molecular Medicine (MDC), Berlin 13125, Germany
| | - E Edry
- Sagol Department of Neurobiology, Center for Gene Manipulation in the Adult Brain (CGMB), Haifa University, Haifa, Israel
| | - V Sharma
- Sagol Department of Neurobiology, Center for Gene Manipulation in the Adult Brain (CGMB), Haifa University, Haifa, Israel
| | - A Papale
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute and University, Milano 20132, Italy
| | - D Pozzi
- Humanitas Clinical and Research Center, Laboratory of Pharmacology and Brain Pathology, Via Manzoni 56, Rozzano, 20089 Milano, Italy
| | - P Defilippi
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino 10124, Italy
| | - J C Meier
- 1] RNA Editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany [2] TU Braunschweig, Zoological Institute, Division of Cell Biology and Cell Physiology, Braunschweig, Germany
| | - R Brambilla
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute and University, Milano 20132, Italy
| | - E Turco
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino 10124, Italy
| | - K Rosenblum
- Sagol Department of Neurobiology, Center for Gene Manipulation in the Adult Brain (CGMB), Haifa University, Haifa, Israel
| | - E E Wanker
- Neuroproteomics, Max Delbrueck Center for Molecular Medicine (MDC), Berlin 13125, Germany
| | - N E Ziv
- Network Biology Labs and Faculty of Medicine, Technion, 33000 Haifa, Israel
| | - E Menna
- 1] Humanitas Clinical and Research Center, Laboratory of Pharmacology and Brain Pathology, Via Manzoni 56, Rozzano, 20089 Milano, Italy [2] Istituto di Neuroscienze del CNR, Milano 20129, Italy
| | - M Matteoli
- 1] Department of Biotechnology and Translational Medicine, University of Milan, Milano 20129, Italy [2] Humanitas Clinical and Research Center, Laboratory of Pharmacology and Brain Pathology, Via Manzoni 56, Rozzano, 20089 Milano, Italy
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Pollegioni P, Van der Linden G, Belisario A, Gras M, Anselmi N, Olimpieri I, Luongo L, Santini A, Turco E, Scarascia Mugnozza G, Malvolti ME. Mechanisms governing the responses to anthracnose pathogen in Juglans spp. J Biotechnol 2011; 159:251-64. [PMID: 21884735 DOI: 10.1016/j.jbiotec.2011.08.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 07/28/2011] [Accepted: 08/08/2011] [Indexed: 11/24/2022]
Abstract
Juglans nigra and Juglans regia are two highly economically important species for wood and fruit production that are susceptible to anthracnose caused by Gnomonia leptostyla. The identification of genotypes resistant to anthracnose could represent a valid alternative to agronomic and chemical management. In this study, we analyzed 72 walnut genotypes that showed a variety of resistance phenotypes in response to natural infection. According to the disease severity rating and microsatellite fingerprinting analysis, these genotypes were divided into three main groups: (40) J. nigra resistant, (1) J. nigra susceptible, and (31) J. regia susceptible. Data on leaf emergence rates and analysis of in vivo pathogenicity indicated that the incidence of anthracnose disease in the field might be partially conditioned by two key factors: the age and/or availability of susceptible leaves during the primary infection of fungus (avoidance by late flushing) and partial host resistance. NBS profiling approach, based on PCR amplification with an adapter primer for an adapter matching a restriction enzyme site and a degenerate primer targeting the conserved motifs present in the NBS domain of NBS-LRR genes, was applied. The results revealed the presence of a candidate marker that correlated to a reduction in anthracnose incidence in 72 walnut genotypes.
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Affiliation(s)
- P Pollegioni
- C.N.R. - Institute of Agro-environmental and Forest Biology, Viale Marconi 2, 05010 Porano, Terni, Italy.
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Antognoni P, Barbieri P, Bruni A, Cenacchi E, Ceroni P, Giacobazzi P, Guidi G, Lanfranchi B, Mazzeo E, Meduri B, Parmiggiani M, Tolento G, Turco E, Costi T, Bertoni F. 1264 poster 4D CT-BASED PTV DEFINITION FOR LUNG TUMOURS: COMPARISON WITH CONVENTIONAL 3D-CRT USING INDIVIDUAL MARGINS. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)71386-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Antognoni P, Barbieri P, Bruni A, Cenacchi E, Ceroni P, Guidi G, Lanfranchi B, Mazzeo E, Meduri B, Parmiggiani M, Pratissoli S, Tolento G, Turco E, Costi T, Bertoni F. 1233 poster AUTOMATIC +/− MANUAL CORRECTION FOR INTER-FRACTION ERRORS DETECTION IN PATIENTS TREATED WITH TOMOTHERAPY®. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)71355-x] [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: 11/28/2022]
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15
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Antognoni P, Bruni A, Cenacchi E, de Marco G, Guidi G, Lanfranchi B, Mazzeo E, Meduri B, Parmiggiani M, Tolento G, Turco E, Danielli C, Bertoni F. 861 poster RAPID SYMPTOMATIC HELICAL TOMOTHERAPY IRRADIATION: FEASIBILITY AND EVALUATION OF CONFORMITY INDEX AND OARS DOSE. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)70983-5] [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: 11/28/2022]
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Turco E, Vizzuso C, Franceschini S, Ragazzi A, Stefanini FM. The in vitro effect of gossypol and its interaction with salts on conidial germination and viability of Fusarium oxysporum sp. vasinfectum isolates. J Appl Microbiol 2008; 103:2370-81. [PMID: 18045422 DOI: 10.1111/j.1365-2672.2007.03503.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To assess the effect of different concentrations of gossypol (0, 2, 4, 10 and 20 mg l(-1)) in combination with NaCl and Na(2)SO(4) (20 mS cm(-1)) on the conidial germination and viability of Fusarium oxysporum f.sp. vasinfectum (Fov). METHODS AND RESULTS A multinomial logistic model was developed to estimate the germination probability of Fov. The inhibitory effect was markedly evident at the two highest concentrations of gossypol; it varied among the isolates tested and with time, and it was attenuated by the presence of sodium salts. The inhibition was temporary as the germination probability increased after 8 h. Fluorescent staining revealed that gossypol either killed the conidia or retarded the elongation of the germ tubes. CONCLUSION Fov showed the ability to overcome gossypol inhibition over time, and the inhibitory effect is reduced under saline conditions. Differential responses among Fov isolates to the presence of gossypol suggest that gossypol tolerance is genetically determined in the pathogen. SIGNIFICANCE AND IMPACT OF THE STUDY This study suggests that selecting for high plant gossypol cultivars would have minimal effect on the overall Fov resistance of cotton. A new statistical model was developed to explore the statistical significance of plant-pathogen interactions.
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Affiliation(s)
- E Turco
- Dipartimento di Biotecnologie Agrarie, Sezione di Patologia vegetale, Università di Firenze, Florence, Italy.
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Turco E, Marianelli L, Vizzuso C, Ragazzi A, Gini R, Selleri B, Tucci R. First Report of Botryosphaeria dothidea on Sycamore, Red Oak, and English Oak in Northwestern Italy. Plant Dis 2006; 90:1106. [PMID: 30781309 DOI: 10.1094/pd-90-1106b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The Parco Nord Milano, Italy is a 600-ha green area (45°53'71″N, 9°20'97″E). Since the spring of 2002, extensive and unknown decline was observed on 20-year-old sycamore (Acer pseudoplatanus), red oak (Quercus rubra), and English oak (Q. robur) plantations. The trees showed branch and twig dieback associated with bark cankering along the whole stem and an irregular to wilted crown. A closer inspection of the inner part of the symptomatic trunk and roots revealed a dark bluish tissue discoloration. From the symptomatic trunk and root tissue, a dark gray abundant mycelium was consistently isolated on potato dextrose agar (PDA). The sequenced internal transcribed spacer (ITS) regions of rDNA (GenBank Accession Nos. DQ198265, DQ198266, and DQ198267) showed 99% identity to Botryosphaeria dothidea strain CBS110302 (GenBank Accession No. AY259092). A Fusicoccum sp. with black pycnidia was consistently collected from the cankers. The conidia were hyaline, aseptate, fusiform to narrowly ellipsoidal, with a truncate base (22 × 4.5 μm), referred to as Fusicoccum aesculi (CBS identification), the anamorph of B. dothidea (2). Pathogenicity tests were conducted for all three hosts by stem inoculation on 18-month-old seedlings growing in plastic pots containing a 2:1 turf/sand mixture. Two experiments were conducted using two inoculation techniques. In the first trial, 6-mm-diameter mycelial plugs of B. dothidea were applied to 6-mm-long bark wounds. The same inoculation method was used for application to bark without wounding. Control seedlings were inoculated with sterile agar plugs in a similar fashion as above. Inoculated and control seedlings were kept in a growth chamber and watered once per week. In the second trial, segments of branches 15-cm long were inoculated with 6-mm-diameter B. dothidea plugs (1), with and without any wounding. Control segments of branches were treated with sterile agar plugs in place of fungal mycelium. The branches were incubated at 23°C in moist chambers. For both experiments, the inoculated stem portions were wrapped with Parafilm to prevent desiccation. There were three replicate seedlings per inoculation technique, experiment, and plant species. After 2 months, all seedlings showed bark cankers and pycnidial formation, while the controls were symptomless. An inner dark bluish stem tissue discoloration was observed. The symptoms were more abundant on the segment of branches where the inoculum was applied to the wounded bark. B. dothidea was successfully reisolated, confirming Koch's postulates. To our knowledge, although it is accepted as synonymous of B. berengeriana (2), this is the first report of B. dothidea on sycamore, red oak, and English oak in Italy. The fungus was previously reported in Italy to cause canker on Platanus spp. References: (1) M. E. Sanchez et al. Plant Dis. 87:1515, 2003. (2) B. Slippers et al. Mycologia 96:83, 2004.
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Affiliation(s)
- E Turco
- Plant Protection Institute-CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - L Marianelli
- Dipartimento di Biotecnologie Agrarie Sez. Patologia vegetale, Università di Firenze, p.le delle Cascine 28, 50144 Firenze, Italy
| | - C Vizzuso
- Dipartimento di Biotecnologie Agrarie Sez. Patologia vegetale, Università di Firenze, p.le delle Cascine 28, 50144 Firenze, Italy
| | - A Ragazzi
- Dipartimento di Biotecnologie Agrarie Sez. Patologia vegetale, Università di Firenze, p.le delle Cascine 28, 50144 Firenze, Italy
| | - R Gini
- Parco Nord Milano, via Clerici 150, Sesto San Giovanni, Italy
| | - B Selleri
- Parco Nord Milano, via Clerici 150, Sesto San Giovanni, Italy
| | - R Tucci
- Parco Nord Milano, via Clerici 150, Sesto San Giovanni, Italy
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Cabodi S, Moro L, Bergatto E, Boeri Erba E, Di Stefano P, Turco E, Tarone G, Defilippi P. Integrin regulation of epidermal growth factor (EGF) receptor and of EGF-dependent responses. Biochem Soc Trans 2005; 32:438-42. [PMID: 15157155 DOI: 10.1042/bst0320438] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.8] [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: 11/17/2022]
Abstract
Integrin signalling co-ordinates with signalling originating from growth factor receptors in the co-operative control of cell proliferation, survival and migration. Increasing evidence suggests that integrins form physical complexes at the cell membrane with growth factor receptors, giving rise to signalling platforms at the adhesive sites. It is probable that at these sites integrins regulate adhesion and at the same time physically constrain and direct the response to soluble growth factors towards proliferation or survival stimuli. These co-operative effects might depend on integrin ability to activate growth factor receptors. In the present paper, we summarize our recent study showing that integrin-dependent adhesion triggers ligand-independent EGFR (epidermal growth factor receptor) activation to transduce downstream signalling. In addition, we also show that integrin-induced signalling pathways are necessary for EGF-dependent transcriptional response, demonstrating the requirement of the co-operation between cell-matrix adhesion and EGFR to achieve full biological responses.
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Affiliation(s)
- S Cabodi
- Dipartimento di Genetica, Biologia e Biochimica, Università di Torino, Via Santena 5 bis, 10126 Torino, Italy
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Moises J, Amessoudji A, Ramirez J, Turco E, Marcheselli V, VanMeter K, Bazan N. An experimental multifaceted traumatic brain injury model. Ann Emerg Med 2004. [DOI: 10.1016/j.annemergmed.2004.07.046] [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: 10/26/2022]
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Di Cunto F, Imarisio S, Hirsch E, Broccoli V, Bulfone A, Migheli A, Atzori C, Turco E, Triolo R, Dotto GP, Silengo L, Altruda F. Defective neurogenesis in citron kinase knockout mice by altered cytokinesis and massive apoptosis. Neuron 2000; 28:115-27. [PMID: 11086988 DOI: 10.1016/s0896-6273(00)00090-8] [Citation(s) in RCA: 194] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Citron-kinase (Citron-K) has been proposed by in vitro studies as a crucial effector of Rho in regulation of cytokinesis. To further investigate in vivo its biologic functions, we have inactivated Citron-K gene in mice by homologous recombination. Citron-K-/- mice grow at slower rates, are severely ataxic, and die before adulthood as a consequence of fatal seizures. Their brains display defective neurogenesis, with depletion of specific neuronal populations. These abnormalities arise during development of the central nervous system due to altered cytokinesis and massive apoptosis. Our results indicate that Citron-K is essential for cytokinesis in vivo but only in specific neuronal precursors. Moreover, they suggest a novel molecular mechanism for a subset of human malformative syndromes of the CNS.
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Affiliation(s)
- F Di Cunto
- Department of Genetics, Biology and Biochemistry, University of Torino, Italy.
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Di Cunto F, Calautti E, Hsiao J, Ong L, Topley G, Turco E, Dotto GP. Citron rho-interacting kinase, a novel tissue-specific ser/thr kinase encompassing the Rho-Rac-binding protein Citron. J Biol Chem 1998; 273:29706-11. [PMID: 9792683 DOI: 10.1074/jbc.273.45.29706] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
We have identified a novel serine/threonine kinase belonging to the myotonic dystrophy kinase family. The kinase can be produced in at least two different isoforms: a approximately 240-kDa protein (Citron Rho-interacting kinase, CRIK), in which the kinase domain is followed by the sequence of Citron, a previously identified Rho/Rac binding protein; a approximately 54-kDa protein (CRIK-short kinase (SK)), which consists mostly of the kinase domain. CRIK and CRIK-SK proteins are capable of phosphorylating exogenous substrates as well as of autophosphorylation, when tested by in vitro kinase assays after expression into COS7 cells. CRIK kinase activity is increased severalfold by coexpression of costitutively active Rho, while active Rac has more limited effects. Kinase activity of endogenous CRIK is indicated by in vitro kinase assays after immunoprecipitation with antibodies recognizing the Citron moiety of the protein. When expressed in keratinocytes, full-length CRIK, but not CRIK-SK, localizes into corpuscular cytoplasmic structures and elicits recruitment of actin into these structures. The previously reported Rho-associated kinases ROCK I and II are ubiquitously expressed. In contrast, CRIK exhibits a restricted pattern of expression, suggesting that this kinase may fulfill a more specialized function in specific cell types.
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Affiliation(s)
- F Di Cunto
- Cutaneous Biology Research Center, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129, USA
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Abstract
Gene therapy has enormous potential and could in the near future involve the clinical biochemist in monitoring its efficacy. The involvement of clinical biochemists in this field could be not only in evaluating the impact of a gene-based strategy on disease progression, but also in measuring the expression of the products of therapeutic genes in treated individuals. Indeed, gene therapy presents new possibilities for the treatment of many diseases and, in particular, merits consideration in the treatment of a fatal disease like AIDS. The aim of this paper is to review the biochemical basis and clinical relevance of the gene therapy approaches directed towards the inhibition of human immunodeficiency virus type-1. We discuss the goals which have been achieved, the problems which have occurred and the efforts that are being made to solve them. In this regard, particular attention is paid to new strategies targeting 'therapeutic' enzymes to human immunodeficiency virus type-1 nucleic acids.
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Affiliation(s)
- A Savarino
- Dipartimento di Scienze Medico-Chirurgiche, Sezione di Malattie Infettive, Torino, Italy
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Abstract
In this study we analyzed the expression of mRNA for PDGF-B and PDGF B-type receptor (PDGFrecB) in 42 biopsy specimens from human astrocytic gliomas and other brain tumors. All gliomas expressed PDGF-B mRNA at higher levels than found in peritumoral and normal nervous tissues. Levels of PDGF-B transcripts correlated strongly with those of mRNA for glial fibrillary acidic protein. Thus, the production of PDGF-B mRNA may be attributed mainly to tumoral glial cells. PDGFrecB transcripts were found in 24 out of 29 gliomas, in agreement with the hypothesis of an autocrine growth stimulation in these tumors. Moreover, mean levels of PDGFrecB expression were higher in glioblastomas than in astrocytomas and over 30-fold higher in meningiomas than in gliomas. This suggests that in gliomas PDGFrecB can be expressed also by vascular elements, in agreement with the hypothesized existence of a paracrine mechanism that may be responsible for the endothelial hyperplasias.
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Affiliation(s)
- A Mauro
- Second Neurological Clinic, University of Turin, Italy
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Giorda R, Turco E, Trucco M. Full length beta chain cDNAs of DQw9 and DQw8 molecules encode proteins that differ only at amino acid 57. Immunogenetics 1991; 33:404-8. [PMID: 2050393 DOI: 10.1007/bf00216702] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- R Giorda
- Department of Pediatrics, University of Pittsburgh, Rangos Research Center, Children's Hospital of Pittsburgh, PA 15213
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Abstract
HLA class II molecules are surface heterodimers which are essential in the initiation of immune responses. The amount of polymorphism expressed by the different class II molecules is largely dependent on the polymorphic structure of their beta chains. Cross-hybridization between class II beta genes frequently hampered restriction fragment length polymorphism analysis of donor genomic DNA. In this report we show that the cross-hybridization between human class II beta genes is mediated by a region of high homology, rich in C and G residues, between the first domain encoding sequences of DP, DQ, and DR genes. The removal of the DNA segment containing this region from the fragments used as labeled probes against the corresponding fragments of the genes at other loci or against endonuclease digested genomic DNA completely eliminated or drastically reduced the cross-hybridization. Also, the RFLP patterns generated with the shortened probes were more informative and much simpler to interpret than were these generated with probes made from the original genes.
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Affiliation(s)
- E Turco
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital, PA 15213
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Abstract
The nucleotide sequence of a complete cDNA gene from a DP4-positive HLA-homozygous cell line, PGF, has been determined. This sequence is identical to the exon sequences in a genomic clone derived from another DP4-positive cell line, Priess. In contrast, our DP cDNA sequence shares only limited homology with partial cDNA sequences obtained from clones of three DP4-negative cell lines. On the basis of these results, we conclude that the phenotypic variation of DP alleles is directly attributable to the nucleotide sequence heterogeneity of DP-beta genes. That is, each phenotypic allelic form of DP antigen corresponds to a distinctly different DP-beta gene. Furthermore, this correspondence is found to be unaffected by the markers present at the DQ and DR loci, since the haplotypes of the PGF and Priess cell lines are, respectively, DR2,DQw1,DP4 and DR4,DQw3,DP4.
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Trucco M, Cascino I, Rosenshine S, Turco E, Marrari M, Di Vecchia L, Zeevi A, Duquesnoy RJ. Definition of HLA-DQ polymorphisms by RFLP and in serological and cellular assays. Transplant Proc 1987; 19:848-50. [PMID: 2908554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- M Trucco
- Department of Pathology, University of Pittsburgh
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Turco E, Care A, Compagnone-Post P, Robinson C, Cascino I, Trucco M. Allelic forms of the alpha- and beta-chain genes encoding DQw1-positive heterodimers. Immunogenetics 1987; 26:282-90. [PMID: 2888727 DOI: 10.1007/bf00346523] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
On chromosome 6, in the HLA region, the DQ subregion is located immediately centromeric to the DR subregion. Even though only three serological specificities to date have been officially recognized (DQw1, DQw2, and DQw3), it seems likely that the phenotypical polymorphism expressed by DQ molecules is much more complex. There are reasons to believe that fixed alpha-beta combinations exist, each of them associated with a different DR allele. DQw1 is a determinant present on DQ molecules that are found associated with DR1-, DR2-, and DRw6-positive haplotypes. By restriction fragment length polymorphism analysis, we recognized three allelic DQ-alpha and three allelic DQ-beta patterns associated with DQw1. In addition, one of these alpha/beta pairs associated with DR1, two with DR2, and a fourth with DRw6. We have obtained evidence using nucleotide sequencing that there are as many allelic forms of DQ-alpha and DQ-beta genes as there are different molecular DQ-alpha and DQ-beta patterns. The DQ-alpha and DQ-beta chains of DQw1-positive molecules each are encoded by at least three distinctly different allelic genes, and particular alpha/beta gene combinations are associated with the same DR alleles as their corresponding molecular alpha/beta pairs.
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Affiliation(s)
- E Turco
- Pittsburgh Cancer Institute, PA 15213
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Cascino I, Rosenshine S, Turco E, Marrari M, Duquesnoy RJ, Trucco M. Relationship between DQ alpha and DQ beta RFLP and cell surface polymorphisms of class II HLA antigens. J Immunogenet 1986; 13:387-400. [PMID: 2887620 DOI: 10.1111/j.1744-313x.1986.tb01124.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
DQ alpha and beta DNA probes of the human major histocompatibility complex (MHC) were hybridized to restriction enzyme-digested genomic DNA with the aim of establishing a correspondence between the polymorphisms recognized by classical serology and DNA restriction fragment length polymorphisms (RFLP). In DR homozygous human cell lines, three distinct PstI fragments were recognized by the DQ alpha probe and four PstI fragments were recognized by the DQ beta probe. Each fragment was associated with a different group of DR antigens. Three allelic forms of either DX alpha or beta genes were identified, but none showed any strong association with DR or DQ. Family segregation analysis at the DNA level further confirmed the DR linkage of the DQ alleles in estimations of gene frequencies of different alleles of DQ alpha, DQ beta, DX alpha and DX beta. Evidence was presented that the DQ alpha and DQ beta allelic forms described at the DNA level correspond to polymorphic determinants at the cell surface which can be defined serologically or in cellular assays. Our data suggest that the HLA-DQ subregion-encoded alloantigens should be defined at the individual alpha and beta chain levels.
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Scalenghe F, Turco E, Edström JE, Pirrotta V, Melli M. Microdissection and cloning of DNA from a specific region of Drosophila melanogaster polytene chromosomes. Chromosoma 1981; 82:205-16. [PMID: 6452995 DOI: 10.1007/bf00286105] [Citation(s) in RCA: 282] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Fragments from section 3 of the salivary gland X chromosome of D. melanogaster were dissected with a micromanipulator. The DNA was extracted, cut and ligated to a lambda vector in a volume of a few nanoliters in an oil chamber monitored through a microscope. From about 10 pg of DNA we obtained 80 recombinant clones, a sample of which were analysed and shown to contain Drosophila DNA which hybridises in situ to the region of section 3 of the X chromosome. With this technique we can isolate clones from any desired region as small as 200 kb from the euchromatic arms of polytene chromosomes.
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Turco E. [Anemia in the course of mechanical ventilation with high concentrations of oxygen]. Minerva Anestesiol 1979; 45:851-60. [PMID: 548810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Silengo L, Altruda F, Dotto GP, Lacquaniti F, Perlo C, Turco E, Mangiarotti G. Ribosome maturation in E. coli. Ital J Biochem 1977; 26:133-43. [PMID: 328448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In vivo and in vitro experiments have shown that processing of ribosomal RNA is a late event in ribosome biogenesis. The precursor form of RNA is probably necessary to speed up the assembly of ribomal proteins. Newly formed ribosomal particles which have already entered polyribosomes differ from mature ribosomes not only in their RNA content but also in their susceptibility to unfolding in low Mg concentration and to RNase attack. Final maturation of new ribosomes is probably dependent on their functioning in protein synthesis. Thus only those ribosomes which have proven to be functional may be converted into stable cellular structures.
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