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Antkowiak A, Viaud J, Severin S, Zanoun M, Ceccato L, Chicanne G, Strassel C, Eckly A, Leon C, Gachet C, Payrastre B, Gaits-Iacovoni F. Cdc42-dependent F-actin dynamics drive structuration of the demarcation membrane system in megakaryocytes. J Thromb Haemost 2016; 14:1268-84. [PMID: 26991240 DOI: 10.1111/jth.13318] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [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: 07/23/2015] [Accepted: 03/03/2016] [Indexed: 02/04/2023]
Abstract
UNLABELLED Essentials Information about the formation of the demarcation membrane system (DMS) is still lacking. We investigated the role of the cytoskeleton in DMS structuration in megakaryocytes. Cdc42/Pak-dependent F-actin remodeling regulates DMS organization for proper megakaryopoiesis. These data highlight the mandatory role of F-actin in platelet biogenesis. SUMMARY Background Blood platelet biogenesis results from the maturation of megakaryocytes (MKs), which involves the development of a complex demarcation membrane system (DMS). Therefore, MK differentiation is an attractive model for studying membrane remodeling. Objectives We sought to investigate the mechanism of DMS structuration in relationship to the cytoskeleton. Results Using three-dimensional (3D) confocal imaging, we have identified consecutive stages of DMS organization that rely on F-actin dynamics to polarize membranes and nuclei territories. Interestingly, microtubules are not involved in this process. We found that the mechanism underlying F-actin-dependent DMS formation required the activation of the guanosine triphosphate hydrolase Cdc42 and its p21-activated kinase effectors (Pak1/2/3). Förster resonance energy transfer demonstrated that active Cdc42 was associated with endomembrane dynamics throughout terminal maturation. Inhibition of Cdc42 or Pak1/2/3 severely destructured the DMS and blocked proplatelet formation. Even though this process does not require containment within the hematopoietic niche, because DMS structuration was observed upon thrombopoietin-treatment in suspension, integrin outside-in signaling was required for Pak activation and probably resulted from secretion of extracellular matrix by MKs. Conclusions These data indicate a functional link, mandatory for MK differentiation, between actin dynamics, regulated by Cdc42/Pak1/2/3, and DMS maturation.
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Affiliation(s)
- A Antkowiak
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
| | - J Viaud
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
| | - S Severin
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
| | - M Zanoun
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
| | - L Ceccato
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
| | - G Chicanne
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
| | - C Strassel
- INSERM, UMR_S949, Université de Strasbourg, Etablissement Français du Sang-Alsace, Toulouse, France
| | - A Eckly
- INSERM, UMR_S949, Université de Strasbourg, Etablissement Français du Sang-Alsace, Toulouse, France
| | - C Leon
- INSERM, UMR_S949, Université de Strasbourg, Etablissement Français du Sang-Alsace, Toulouse, France
| | - C Gachet
- INSERM, UMR_S949, Université de Strasbourg, Etablissement Français du Sang-Alsace, Toulouse, France
| | - B Payrastre
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
- Laboratoire d'Hématologie, CHU de Toulouse, Toulouse, France
| | - F Gaits-Iacovoni
- INSERM, UMR1048, Université Toulouse III, Institut des Maladies Métaboliques et Cardiovasculaires, Toulouse, France
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Clavel C, Ceccato L, Anquetil F, Serre G, Sebbag M. A1.33 Among human macrophages polarised to different phenotypes, the M-CSF-oriented cells present the highest pro-inflammatory response to the rheumatoid arthritis-specific immune complexes containing ACPA. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-209124.33] [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]
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Zermiani M, Zonin E, Nonis A, Begheldo M, Ceccato L, Vezzaro A, Baldan B, Trentin A, Masi A, Pegoraro M, Fadanelli L, Teale W, Palme K, Quintieri L, Ruperti B. Ethylene negatively regulates transcript abundance of ROP-GAP rheostat-encoding genes and affects apoplastic reactive oxygen species homeostasis in epicarps of cold stored apple fruits. J Exp Bot 2015; 66:7255-70. [PMID: 26428066 PMCID: PMC4765793 DOI: 10.1093/jxb/erv422] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Apple (Malus×domestica Borkh) fruits are stored for long periods of time at low temperatures (1 °C) leading to the occurrence of physiological disorders. 'Superficial scald' of Granny Smith apples, an economically important ethylene-dependent disorder, was used as a model to study relationships among ethylene action, the regulation of the ROP-GAP rheostat, and maintenance of H2O2 homeostasis in fruits during prolonged cold exposure. The ROP-GAP rheostat is a key module for adaptation to low oxygen in Arabidopsis through Respiratory Burst NADPH Oxidase Homologs (RBOH)-mediated and ROP GTPase-dependent regulation of reactive oxygen species (ROS) homeostasis. Here, it was shown that the transcriptional expression of several components of the apple ROP-GAP machinery, including genes encoding RBOHs, ROPs, and their ancillary proteins ROP-GEFs and ROP-GAPs, is coordinately and negatively regulated by ethylene in conjunction with the progressive impairment of apoplastic H2O2 homeostatic levels. RNA sequencing analyses showed that several components of the known ROP- and ROS-associated transcriptional networks are regulated along with the ROP-GAP rheostat in response to ethylene perception. These findings may extend the role of the ROP-GAP rheostat beyond hypoxic responses and suggest that it may be a functional regulatory node involved in the integration of ethylene and ROS signalling pathways in abiotic stress.
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Affiliation(s)
- Monica Zermiani
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Elisabetta Zonin
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Alberto Nonis
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Maura Begheldo
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Luca Ceccato
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Alice Vezzaro
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Barbara Baldan
- Department of Biology, University of Padova, 35121 Padova, Italy
| | - Annarita Trentin
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Antonio Masi
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Marco Pegoraro
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
| | - Livio Fadanelli
- Edmund Mach Foundation, San Michele all'Adige, 38123 Trento, Italy
| | - William Teale
- Institute of Biology II/Molecular Plant Physiology, Faculty of Biology, Albert-Ludwigs-University of Freiburg, D-79104 Freiburg, Germany
| | - Klaus Palme
- Institute of Biology II/Molecular Plant Physiology, Faculty of Biology, Albert-Ludwigs-University of Freiburg, D-79104 Freiburg, Germany Centre for Biological Systems Analysis, Albert-Ludwigs-University of Freiburg, D-79104 Freiburg, Germany Freiburg Institute for Advanced Sciences (FRIAS), Albert-Ludwigs-University of Freiburg, D-79104 Freiburg, Germany Centre for Biological Signalling Studies (bioss), Albert-Ludwigs-University of Freiburg, D-79104 Freiburg, Germany Freiburg Initiative for Systems Biology (FRISYS), Albert-Ludwigs-University of Freiburg, D-79104 Freiburg, Germany
| | - Luigi Quintieri
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, 35131 Padova, Italy
| | - Benedetto Ruperti
- Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, 35020 Legnaro, Italy
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Aubry A, Galiacy S, Ceccato L, Marchand C, Tricoire C, Lopez F, Bremner R, Racaud-Sultan C, Monsarrat B, Malecaze F, Allouche M. Peptides derived from the dependence receptor ALK are proapoptotic for ALK-positive tumors. Cell Death Dis 2015; 6:e1736. [PMID: 25950466 PMCID: PMC4669685 DOI: 10.1038/cddis.2015.102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 02/20/2015] [Accepted: 02/24/2015] [Indexed: 01/03/2023]
Abstract
ALK is a receptor tyrosine kinase with an oncogenic role in various types of human malignancies. Despite constitutive activation of the kinase through gene alterations, such as chromosomal translocation, gene amplification or mutation, treatments with kinase inhibitors invariably lead to the development of resistance. Aiming to develop new tools for ALK targeting, we took advantage of our previous demonstration identifying ALK as a dependence receptor, implying that in the absence of ligand the kinase-inactive ALK triggers or enhances apoptosis. Here, we synthesized peptides mimicking the proapoptotic domain of ALK and investigated their biological effects on tumor cells. We found that an ALK-derived peptide of 36 amino acids (P36) was cytotoxic for ALK-positive anaplastic large-cell lymphoma and neuroblastoma cell lines. In contrast, ALK-negative tumor cells and normal peripheral blood mononuclear cells were insensitive to P36. The cytotoxic effect was due to caspase-dependent apoptosis and required N-myristoylation of the peptide. Two P36-derived shorter peptides as well as a cyclic peptide also induced apoptosis. Surface plasmon resonance and mass spectrometry analysis of P36-interacting proteins from two responsive cell lines, Cost lymphoma and SH-SY5Y neuroblastoma, uncovered partners that could involve p53-dependent signaling and pre-mRNA splicing. Furthermore, siRNA-mediated knockdown of p53 rescued these cells from P36-induced apoptosis. Finally, we observed that a treatment combining P36 with the ALK-specific inhibitor crizotinib resulted in additive cytotoxicity. Therefore, ALK-derived peptides could represent a novel targeted therapy for ALK-positive tumors.
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Affiliation(s)
- A Aubry
- 1] Université de Toulouse, UPS, EA4555, GR2DE, CPTP, Toulouse F-31300, France [2] Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, M5G 1X5, Canada [3] Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, M5S 1A1, Canada
| | - S Galiacy
- 1] Université de Toulouse, UPS, EA4555, GR2DE, CPTP, Toulouse F-31300, France [2] CHU Purpan, Toulouse F-31300, France
| | - L Ceccato
- Université de Toulouse, UPS, EA4555, GR2DE, CPTP, Toulouse F-31300, France
| | - C Marchand
- Université de Toulouse, UPS, EA4555, GR2DE, CPTP, Toulouse F-31300, France
| | - C Tricoire
- Université de Toulouse, UPS, EA4555, GR2DE, CPTP, Toulouse F-31300, France
| | - F Lopez
- INSERM, UMR1037, CRCT, Toulouse F-31000, France
| | - R Bremner
- 1] Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, M5G 1X5, Canada [2] Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, M5S 1A1, Canada
| | - C Racaud-Sultan
- 1] INSERM, UMR 1043, CPTP, Toulouse F-31300, France [2] CNRS, UMR 5282, CPTP, Toulouse F-31300, France
| | - B Monsarrat
- CNRS, UMR 5089, IPBS, Toulouse F-31077, France
| | - F Malecaze
- 1] Université de Toulouse, UPS, EA4555, GR2DE, CPTP, Toulouse F-31300, France [2] CHU Purpan, Toulouse F-31300, France
| | - M Allouche
- Université de Toulouse, UPS, EA4555, GR2DE, CPTP, Toulouse F-31300, France
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Galbiati F, Sinha Roy D, Simonini S, Cucinotta M, Ceccato L, Cuesta C, Simaskova M, Benkova E, Kamiuchi Y, Aida M, Weijers D, Simon R, Masiero S, Colombo L. An integrative model of the control of ovule primordia formation. Plant J 2013; 76:446-55. [PMID: 23941199 DOI: 10.1111/tpj.12309] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 08/07/2013] [Accepted: 08/08/2013] [Indexed: 05/18/2023]
Abstract
Upon hormonal signaling, ovules develop as lateral organs from the placenta. Ovule numbers ultimately determine the number of seeds that develop, and thereby contribute to the final seed yield in crop plants. We demonstrate here that CUP-SHAPED COTYLEDON 1 (CUC1), CUC2 and AINTEGUMENTA (ANT) have additive effects on ovule primordia formation. We show that expression of the CUC1 and CUC2 genes is required to redundantly regulate expression of PINFORMED1 (PIN1), which in turn is required for ovule primordia formation. Furthermore, our results suggest that the auxin response factor MONOPTEROS (MP/ARF5) may directly bind ANT, CUC1 and CUC2 and promote their transcription. Based on our findings, we propose an integrative model to describe the molecular mechanisms of the early stages of ovule development.
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Affiliation(s)
- Francesca Galbiati
- Dipartimento di Bioscienze, Università degli Studi di Milano, Via Celoria 26, 20133, Milano, Italy
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Ceccato L, Masiero S, Sinha Roy D, Bencivenga S, Roig-Villanova I, Ditengou FA, Palme K, Simon R, Colombo L. Maternal control of PIN1 is required for female gametophyte development in Arabidopsis. PLoS One 2013; 8:e66148. [PMID: 23799075 PMCID: PMC3684594 DOI: 10.1371/journal.pone.0066148] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [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: 12/19/2012] [Accepted: 04/30/2013] [Indexed: 12/29/2022] Open
Abstract
Land plants are characterised by haplo-diploid life cycles, and developing ovules are the organs in which the haploid and diploid generations coexist. Recently it has been shown that hormones such as auxin and cytokinins play important roles in ovule development and patterning. The establishment and regulation of auxin levels in cells is predominantly determined by the activity of the auxin efflux carrier proteins PIN-FORMED (PIN). To study the roles of PIN1 and PIN3 during ovule development we have used mutant alleles of both genes and also perturbed PIN1 and PIN3 expression using micro-RNAs controlled by the ovule specific DEFH9 (DEFIFICENS Homologue 9) promoter. PIN1 down-regulation and pin1-5 mutation severely affect female gametophyte development since embryo sacs arrest at the mono- and/or bi-nuclear stages (FG1 and FG3 stage). PIN3 function is not required for ovule development in wild-type or PIN1-silenced plants. We show that sporophytically expressed PIN1 is required for megagametogenesis, suggesting that sporophytic auxin flux might control the early stages of female gametophyte development, although auxin response is not visible in developing embryo sacs.
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Affiliation(s)
- Luca Ceccato
- Dipartimento di BioScienze, Università degli Studi di Milano, Milano, Italy
| | - Simona Masiero
- Dipartimento di BioScienze, Università degli Studi di Milano, Milano, Italy
| | - Dola Sinha Roy
- Dipartimento di BioScienze, Università degli Studi di Milano, Milano, Italy
| | - Stefano Bencivenga
- Dipartimento di BioScienze, Università degli Studi di Milano, Milano, Italy
| | | | - Franck Anicet Ditengou
- Institute of Biology II, Faculty of Biology, Albert-Ludwigs-Universität of Freiburg, Schänzlestrasse 1, Freiburg, Germany
| | - Klaus Palme
- Institute of Biology II, Faculty of Biology, Albert-Ludwigs-Universität of Freiburg, Schänzlestrasse 1, Freiburg, Germany
| | - Rüdiger Simon
- Institut für Entwicklungsgenetik, Heinrich-Heine Universität, Düsseldorf, Germany
| | - Lucia Colombo
- Dipartimento di BioScienze, Università degli Studi di Milano, Milano, Italy
- Institute of Biology II, Faculty of Biology, Albert-Ludwigs-Universität of Freiburg, Schänzlestrasse 1, Freiburg, Germany
- Institut für Entwicklungsgenetik, Heinrich-Heine Universität, Düsseldorf, Germany
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Milano, Italy
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Giannini V, Ceccato L, Hutton C, Allan AA, Kienberger S, Flügel WA, Giupponi C. Development of responses based on IPCC and "what-if?" IWRM scenarios. Adv Sci Res 2011. [DOI: 10.5194/asr-7-71-2011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract. This work illustrates the findings of a participatory research process aimed at identifying responses for sustainable water management in a climate change perspective, in two river basins in Europe and Asia. The chapter describes the methodology implemented through local participatory workshops, aimed at eliciting and evaluating possible responses to flood risk, which were then assessed with respect to the existing governance framework. Socio-economic vulnerability was also investigated developing an indicator, whose future trend was analysed with reference to IPCC scenarios. The main outcome of such activities consists in the identification of Integrated Water Resource Management Strategies (IWRMS) based upon the issues and preferences elicited from local experts. The mDSS decision support tool was used to facilitate transparent and robust management of the information collected and communication of the outputs.
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