1
|
Molina E, Cataldo VF, Eggers C, Muñoz-Madrid V, Glavic Á. p53 Related Protein Kinase is Required for Arp2/3-Dependent Actin Dynamics of Hemocytes in Drosophila melanogaster. Front Cell Dev Biol 2022; 10:859105. [PMID: 35721516 PMCID: PMC9201722 DOI: 10.3389/fcell.2022.859105] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 04/22/2022] [Indexed: 11/21/2022] Open
Abstract
Cells extend membrane protrusions like lamellipodia and filopodia from the leading edge to sense, to move and to form new contacts. The Arp2/3 complex sustains lamellipodia formation, and in conjunction with the actomyosin contractile system, provides mechanical strength to the cell. Drosophila p53-related protein kinase (Prpk), a Tsc5p ortholog, has been described as essential for cell growth and proliferation. In addition, Prpk interacts with proteins associated to actin filament dynamics such as α-spectrin and the Arp2/3 complex subunit Arpc4. Here, we investigated the role of Prpk in cell shape changes, specifically regarding actin filament dynamics and membrane protrusion formation. We found that reductions in Prpk alter cell shape and the structure of lamellipodia, mimicking the phenotypes evoked by Arp2/3 complex deficiencies. Prpk co-localize and co-immunoprecipitates with the Arp2/3 complex subunit Arpc1 and with the small GTPase Rab35. Importantly, expression of Rab35, known by its ability to recruit upstream regulators of the Arp2/3 complex, could rescue the Prpk knockdown phenotypes. Finally, we evaluated the requirement of Prpk in different developmental contexts, where it was shown to be essential for correct Arp2/3 complex distribution and actin dynamics required for hemocytes migration, recruitment, and phagocytosis during immune response.
Collapse
Affiliation(s)
- Emiliano Molina
- FONDAP Center for Genome Regulation, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Vicente F. Cataldo
- Department of Chemical and Bioprocess Engineering, School of Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Cristián Eggers
- Department for Chemistry and Biochemistry and Pharmaceutical Sciences, Faculty of Science, University of Bern, Bern, Switzerland
| | - Valentina Muñoz-Madrid
- FONDAP Center for Genome Regulation, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Álvaro Glavic
- FONDAP Center for Genome Regulation, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
- *Correspondence: Álvaro Glavic,
| |
Collapse
|
2
|
Pihán P, Lisbona F, Borgonovo J, Edwards-Jorquera S, Nunes-Hasler P, Castillo K, Kepp O, Urra H, Saarnio S, Vihinen H, Carreras-Sureda A, Forveille S, Sauvat A, De Giorgis D, Pupo A, Rodríguez DA, Quarato G, Sagredo A, Lourido F, Letai A, Latorre R, Kroemer G, Demaurex N, Jokitalo E, Concha ML, Glavic Á, Green DR, Hetz C. Control of lysosomal-mediated cell death by the pH-dependent calcium channel RECS1. Sci Adv 2021; 7:eabe5469. [PMID: 34767445 PMCID: PMC8589314 DOI: 10.1126/sciadv.abe5469] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 09/24/2021] [Indexed: 05/27/2023]
Abstract
Programmed cell death is regulated by the balance between activating and inhibitory signals. Here, we have identified RECS1 (responsive to centrifugal force and shear stress 1) [also known as TMBIM1 (transmembrane BAX inhibitor motif containing 1)] as a proapoptotic member of the TMBIM family. In contrast to other proteins of the TMBIM family, RECS1 expression induces cell death through the canonical mitochondrial apoptosis pathway. Unbiased screening indicated that RECS1 sensitizes cells to lysosomal perturbations. RECS1 localizes to lysosomes, where it regulates their acidification and calcium content, triggering lysosomal membrane permeabilization. Structural modeling and electrophysiological studies indicated that RECS1 is a pH-regulated calcium channel, an activity that is essential to trigger cell death. RECS1 also sensitizes whole animals to stress in vivo in Drosophila melanogaster and zebrafish models. Our results unveil an unanticipated function for RECS1 as a proapoptotic component of the TMBIM family that ignites cell death programs at lysosomes.
Collapse
Affiliation(s)
- Philippe Pihán
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Fernanda Lisbona
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
- Center for Genome Regulation, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Janina Borgonovo
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile
- Program of Integrative Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | | | - Paula Nunes-Hasler
- Department of Cell Physiology and Metabolism, University of Geneva, Geneva, Switzerland
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Karen Castillo
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Oliver Kepp
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Hery Urra
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Suvi Saarnio
- Electron Microscopy Unit, Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland
| | - Helena Vihinen
- Electron Microscopy Unit, Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland
| | - Amado Carreras-Sureda
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
- Department of Cell Physiology and Metabolism, University of Geneva, Geneva, Switzerland
| | - Sabrina Forveille
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Allan Sauvat
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
| | - Daniela De Giorgis
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Amaury Pupo
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Diego A. Rodríguez
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Giovanni Quarato
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Alfredo Sagredo
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Fernanda Lourido
- Center for Genome Regulation, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Anthony Letai
- Department of Medical Oncology, Dana-Farber Cancer Institute, 450 Brookline Avenue, Dana Building, Room DA-520, Boston, MA 02215-02115, USA
- Harvard Medical School, Boston, MA 02215, USA
- Department of Medicine, Brigham and Women’s Hospital, Boston, MA 02215, USA
| | - Ramon Latorre
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Guido Kroemer
- Centre de Recherche des Cordeliers, Equipe labellisée par la Ligue contre le cancer, Université de Paris, Sorbonne Université, Inserm U1138, Institut Universitaire de France, Paris, France
- Metabolomics and Cell Biology Platforms, Institut Gustave Roussy, Villejuif, France
- Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP, Paris, France
- Suzhou Institute for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China
- Karolinska Institutet, Department of Women’s and Children’s Health, Karolinska University Hospital, Stockholm, Sweden
| | - Nicolas Demaurex
- Department of Cell Physiology and Metabolism, University of Geneva, Geneva, Switzerland
- Centro de Investigación de Estudios Avanzados, Universidad Católica del Maule, Talca, Chile
| | - Eija Jokitalo
- Electron Microscopy Unit, Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, Helsinki, Finland
| | - Miguel L. Concha
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile
- Program of Integrative Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Álvaro Glavic
- Center for Genome Regulation, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Douglas R. Green
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Claudio Hetz
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
- Buck Institute for Research on Aging, Novato, CA 94945, USA
| |
Collapse
|
3
|
Urra H, Henriquez DR, Cánovas J, Villarroel-Campos D, Carreras-Sureda A, Pulgar E, Molina E, Hazari YM, Limia CM, Alvarez-Rojas S, Figueroa R, Vidal RL, Rodriguez DA, Rivera CA, Court FA, Couve A, Qi L, Chevet E, Akai R, Iwawaki T, Concha ML, Glavic Á, Gonzalez-Billault C, Hetz C. Author Correction: IRE1α governs cytoskeleton remodeling and cell migration through a direct interaction with filamin A. Nat Cell Biol 2021; 23:577. [PMID: 33907311 DOI: 10.1038/s41556-021-00673-2] [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: 11/09/2022]
Affiliation(s)
- Hery Urra
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Daniel R Henriquez
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - José Cánovas
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile
| | - David Villarroel-Campos
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Amado Carreras-Sureda
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Eduardo Pulgar
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Program of Anatomy and Developmental Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Emiliano Molina
- Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile.,Center for Genome Regulation, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Younis M Hazari
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Celia M Limia
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Sebastián Alvarez-Rojas
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Ricardo Figueroa
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Rene L Vidal
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile
| | - Diego A Rodriguez
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Claudia A Rivera
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile
| | - Felipe A Court
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile
| | - Andrés Couve
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Department of Neuroscience, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Ling Qi
- Department of Molecular and Integrative Physiology, Division of Metabolism, Endocrinology and Diabetes, The University of Michigan Medical School, Ann Arbor, MI, USA
| | - Eric Chevet
- INSERM U1242 Chemistry, Oncogenesis, Stress and Signaling, University of Rennes 1, Rennes, France.,Centre de Lutte contre le Cancer Eugène Marquis, Rennes, France
| | - Ryoko Akai
- Division of Cell Medicine, Department of Life Science, Medical Research Institute, Kanazawa Medical University, Uchinada, Japan
| | - Takao Iwawaki
- Division of Cell Medicine, Department of Life Science, Medical Research Institute, Kanazawa Medical University, Uchinada, Japan
| | - Miguel L Concha
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile.,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Program of Anatomy and Developmental Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile
| | - Álvaro Glavic
- Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile.,Center for Genome Regulation, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Christian Gonzalez-Billault
- Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile.,Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Claudio Hetz
- Biomedical Neuroscience Institute, Faculty of Medicine, University of Chile, Santiago, Chile. .,Center for Geroscience, Brain Health and Metabolism (GERO), Santiago, Chile. .,Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, University of Chile, Santiago, Chile. .,The Buck Institute for Research in Aging, Novato, CA, USA. .,Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA, USA.
| |
Collapse
|
4
|
Edwards-Jorquera SS, Bosveld F, Bellaïche YA, Lennon-Duménil AM, Glavic Á. Trpml controls actomyosin contractility and couples migration to phagocytosis in fly macrophages. J Cell Biol 2020; 219:133603. [PMID: 31940424 PMCID: PMC7055000 DOI: 10.1083/jcb.201905228] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 06/03/2019] [Revised: 11/13/2019] [Accepted: 12/07/2019] [Indexed: 12/29/2022] Open
Abstract
Phagocytes use their actomyosin cytoskeleton to migrate as well as to probe their environment by phagocytosis or macropinocytosis. Although migration and extracellular material uptake have been shown to be coupled in some immune cells, the mechanisms involved in such coupling are largely unknown. By combining time-lapse imaging with genetics, we here identify the lysosomal Ca2+ channel Trpml as an essential player in the coupling of cell locomotion and phagocytosis in hemocytes, the Drosophila macrophage-like immune cells. Trpml is needed for both hemocyte migration and phagocytic processing at distinct subcellular localizations: Trpml regulates hemocyte migration by controlling actomyosin contractility at the cell rear, whereas its role in phagocytic processing lies near the phagocytic cup in a myosin-independent fashion. We further highlight that Vamp7 also regulates phagocytic processing and locomotion but uses pathways distinct from those of Trpml. Our results suggest that multiple mechanisms may have emerged during evolution to couple phagocytic processing to cell migration and facilitate space exploration by immune cells.
Collapse
Affiliation(s)
| | - Floris Bosveld
- Institut Curie, PSL Research University, Sorbonne Universités, UPMC Univ Paris 06, Centre National de la Recherche Scientifique UMR 3215, Institut National de la Santé et de la Recherche Médicale U934, Paris, France
| | - Yohanns A Bellaïche
- Institut Curie, PSL Research University, Sorbonne Universités, UPMC Univ Paris 06, Centre National de la Recherche Scientifique UMR 3215, Institut National de la Santé et de la Recherche Médicale U934, Paris, France
| | - Ana-María Lennon-Duménil
- Institut Curie, PSL Research University, Institut National de la Santé et de la Recherche Médicale U932 Immunité et Cancer, Paris, France
| | - Álvaro Glavic
- Centro de Regulación del Genoma, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| |
Collapse
|
5
|
Contreras EG, Palominos T, Glavic Á, Brand AH, Sierralta J, Oliva C. The transcription factor SoxD controls neuronal guidance in the Drosophila visual system. Sci Rep 2018; 8:13332. [PMID: 30190506 PMCID: PMC6127262 DOI: 10.1038/s41598-018-31654-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 08/23/2018] [Indexed: 01/21/2023] Open
Abstract
Precise control of neurite guidance during development is essential to ensure proper formation of neuronal networks and correct function of the central nervous system (CNS). How neuronal projections find their targets to generate appropriate synapses is not entirely understood. Although transcription factors are key molecules during neurogenesis, we do not know their entire function during the formation of networks in the CNS. Here, we used the Drosophila melanogaster optic lobe as a model for understanding neurite guidance during development. We assessed the function of Sox102F/SoxD, the unique Drosophila orthologue of the vertebrate SoxD family of transcription factors. SoxD is expressed in immature and mature neurons in the larval and adult lobula plate ganglia (one of the optic lobe neuropils), but is absent from glial cells, neural stem cells and progenitors of the lobula plate. SoxD RNAi knockdown in all neurons results in a reduction of the lobula plate neuropil, without affecting neuronal fate. This morphological defect is associated with an impaired optomotor response of adult flies. Moreover, knocking down SoxD only in T4/T5 neuronal types, which control motion vision, affects proper neurite guidance into the medulla and lobula. Our findings suggest that SoxD regulates neurite guidance, without affecting neuronal fate.
Collapse
Affiliation(s)
- Esteban G Contreras
- Department of Neuroscience and Biomedical Neuroscience Institute, Faculty of Medicine, Universidad de Chile, Independencia, 1027, Santiago, Chile.,Center for Genome Regulation, Faculty of Sciences, Universidad de Chile, Las Palmeras, 3425, Nuñoa, Santiago, Chile
| | - Tomás Palominos
- Department of Cellular and Molecular Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Av Libertador Bernardo O'Higgins 340, Santiago, Chile
| | - Álvaro Glavic
- Center for Genome Regulation, Faculty of Sciences, Universidad de Chile, Las Palmeras, 3425, Nuñoa, Santiago, Chile
| | - Andrea H Brand
- The Gurdon Institute and Department of Physiology, Development and Neuroscience, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QN, United Kingdom
| | - Jimena Sierralta
- Department of Neuroscience and Biomedical Neuroscience Institute, Faculty of Medicine, Universidad de Chile, Independencia, 1027, Santiago, Chile
| | - Carlos Oliva
- Department of Cellular and Molecular Biology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Av Libertador Bernardo O'Higgins 340, Santiago, Chile.
| |
Collapse
|
6
|
Edwards SS, Delgado MG, Nader GPDF, Piel M, Bellaïche Y, Lennon-Duménil AM, Glavic Á. An in vitro method for studying subcellular rearrangements during cell polarization in Drosophila melanogaster hemocytes. Mech Dev 2018; 154:277-286. [PMID: 30096416 DOI: 10.1016/j.mod.2018.08.003] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 08/04/2018] [Accepted: 08/06/2018] [Indexed: 12/13/2022]
Abstract
Thanks to the power of Drosophila genetics, this animal model has been a precious tool for scientists to uncover key processes associated to innate immunity. The fly immune system relies on a population of macrophage-like cells, also referred to as hemocytes, which are highly migratory and phagocytic, and can easily be followed in vivo. These cells have shown to play important roles in fly development, both at the embryonic and pupal stages. However, there is no robust assay for the study of hemocyte migration in vitro, which limits our understanding of the molecular mechanisms involved. Here, we contribute to fill this gap by showing that hemocytes adopt a polarized morphology upon ecdysone stimulation, allowing the study of the cytoskeleton rearrangements and organelle reorganization that take place during the first step of cell locomotion.
Collapse
Affiliation(s)
- Sandra Sofía Edwards
- Centro de Regulación del Genoma, Facultad de Ciencias, Universidad de Chile, Santiago 7800024, Chile.
| | - María Graciela Delgado
- Institut Curie, PSL Research University, INSERM U932 Immunité et Cancer, F-75248 Paris Cedex 05, France.
| | - Guilherme Pedreira de Freitas Nader
- Institut Curie, PSL Research University, CNRS, UMR 144, F-75005 Paris, France; Institut Pierre-Gilles de Gennes, PSL Research University, F-75005 Paris, France.
| | - Matthieu Piel
- Institut Curie, PSL Research University, CNRS, UMR 144, F-75005 Paris, France; Institut Pierre-Gilles de Gennes, PSL Research University, F-75005 Paris, France.
| | - Yohanns Bellaïche
- Institut Curie, PSL Research University, CNRS UMR 3215, INSERM U934, F-75248 Paris Cedex 05, France; Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 3215, INSERM U934, F-75005, France.
| | - Ana María Lennon-Duménil
- Institut Curie, PSL Research University, INSERM U932 Immunité et Cancer, F-75248 Paris Cedex 05, France.
| | - Álvaro Glavic
- Centro de Regulación del Genoma, Facultad de Ciencias, Universidad de Chile, Santiago 7800024, Chile.
| |
Collapse
|
7
|
Ibar C, Glavic Á. Drosophila p115 is required for Cdk1 activation and G2/M cell cycle transition. Mech Dev 2017; 144:191-200. [PMID: 28396045 DOI: 10.1016/j.mod.2017.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 03/28/2017] [Accepted: 04/07/2017] [Indexed: 11/25/2022]
Abstract
Golgi complex inheritance and its relationship with the cell cycle are central in cell biology. Golgi matrix proteins, known as golgins, are one of the components that underlie the shape and functionality of this organelle. In mammalian cells, golgins are phosphorylated during mitosis to allow fragmentation of the Golgi ribbon and they also participate in spindle dynamics; both processes are required for cell cycle progression. Little is known about the function of golgins during mitosis in metazoans in vivo. This is particularly significant in Drosophila, in which the Golgi architecture is distributed in numerous units scattered throughout the cytoplasm, in contrast with mammalian cells. We examined the function of the ER/cis-Golgi golgin p115 during the proliferative phase of the Drosophila wing imaginal disc. Knockdown of p115 decreased tissue size. This phenotype was not caused by programmed cell death or cell size reductions, but by a reduction in the final cell number due to an accumulation of cells at the G2/M transition. This phenomenon frequently allows mitotic bypass and re-replication of DNA. These outcomes are similar to those observed following the partial loss of function of positive regulators of Cdk1 in Drosophila. In agreement with this, Cdk1 activation was reduced upon p115 knockdown. Interestingly, these phenotypes were fully rescued by Cdk1 overexpression and partially rescued by Myt1 depletion, but not by String (also known as Cdc25) overexpression. Additionally, we confirmed the physical interaction between p115 and Cdk1, suggesting that the formation of a complex where both proteins are present is essential for the full activation of Cdk1 and thus the correct progression of mitosis in proliferating tissues.
Collapse
Affiliation(s)
- Consuelo Ibar
- FONDAP Center for Genome Regulation, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago, Chile.
| | - Álvaro Glavic
- FONDAP Center for Genome Regulation, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago, Chile.
| |
Collapse
|
8
|
Abstract
The TOR signaling pathway is crucial in the translation of nutritional inputs into the protein synthesis machinery regulation, allowing animal growth. We recently identified the Bud32 (yeast)/PRPK (human) ortholog in Drosophila, Prpk (p53-related protein kinase), and found that it is required for TOR kinase activity. Bud32/PRPK is an ancient and atypical kinase conserved in evolution from Archeae to humans, being essential for Archeae. It has been linked with p53 stabilization in human cell culture and its absence in yeast causes a slow-growth phenotype. This protein has been associated to KEOPS (kinase, putative endopeptidase and other proteins of small size) complex together with Kae1p (ATPase), Cgi-121 and Pcc1p. This complex has been implicated in telomere maintenance, transcriptional regulation, bud site selection and chemical modification of tRNAs (tRNAs). Bud32p and Kae1p have been related with N6-threonylcarbamoyladenosine (t6A) synthesis, a particular chemical modification that occurs at position 37 of tRNAs that pair A-starting codons, required for proper translation in most species. Lack of this modification causes mistranslations and open reading frame shifts in yeast. The core constituents of the KEOPS complex are present in Drosophila, but their physical interaction has not been reported yet. Here, we present a review of the findings regarding the function of this complex in different organisms and new evidence that extends our recent observations of Prpk function in animal growth showing that depletion of Kae1 or Prpk, in accordance with their role in translation in yeast, is able to induce the unfolded protein response (UPR) in Drosophila. We suggest that EKC/KEOPS complex could be integrating t6A-modified tRNA availability with translational rates, which are ultimately reflected in animal growth.
Collapse
Affiliation(s)
- Diego Rojas-Benítez
- FONDAP Center for Genome Regulation; Departamento de Biología; Facultad de Ciencias; Universidad de Chile; Santiago, Chile
| | | | | |
Collapse
|
9
|
Ibar C, Cataldo VF, Vásquez-Doorman C, Olguín P, Glavic Á. Drosophila p53-related protein kinase is required for PI3K/TOR pathway-dependent growth. J Cell Sci 2013. [DOI: 10.1242/jcs.133157] [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: 11/20/2022] Open
|