1
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Sekeresova Kralova J, Donic C, Dassa B, Livyatan I, Jansen PM, Ben-Dor S, Fidel L, Trzebanski S, Narunsky-Haziza L, Asraf O, Brenner O, Dafni H, Jona G, Boura-Halfon S, Stettner N, Segal E, Brunke S, Pilpel Y, Straussman R, Zeevi D, Bacher P, Hube B, Shlezinger N, Jung S. Competitive fungal commensalism mitigates candidiasis pathology. J Exp Med 2024; 221:e20231686. [PMID: 38497819 PMCID: PMC10949073 DOI: 10.1084/jem.20231686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 01/17/2024] [Accepted: 02/14/2024] [Indexed: 03/19/2024] Open
Abstract
The mycobiota are a critical part of the gut microbiome, but host-fungal interactions and specific functional contributions of commensal fungi to host fitness remain incompletely understood. Here, we report the identification of a new fungal commensal, Kazachstania heterogenica var. weizmannii, isolated from murine intestines. K. weizmannii exposure prevented Candida albicans colonization and significantly reduced the commensal C. albicans burden in colonized animals. Following immunosuppression of C. albicans colonized mice, competitive fungal commensalism thereby mitigated fatal candidiasis. Metagenome analysis revealed K. heterogenica or K. weizmannii presence among human commensals. Our results reveal competitive fungal commensalism within the intestinal microbiota, independent of bacteria and immune responses, that could bear potential therapeutic value for the management of C. albicans-mediated diseases.
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Affiliation(s)
| | - Catalina Donic
- Departments of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Bareket Dassa
- Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | - Ilana Livyatan
- Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Paul Mathias Jansen
- Department of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural Product Research and Infection Biology—Hans Knoell Institute Jena (HKI), Jena, Germany
| | - Shifra Ben-Dor
- Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | - Lena Fidel
- Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | - Sébastien Trzebanski
- Departments of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | | | - Omer Asraf
- Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Ori Brenner
- Veterinary Resources, Weizmann Institute of Science, Rehovot, Israel
| | - Hagit Dafni
- Veterinary Resources, Weizmann Institute of Science, Rehovot, Israel
| | - Ghil Jona
- Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | - Sigalit Boura-Halfon
- Departments of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Noa Stettner
- Veterinary Resources, Weizmann Institute of Science, Rehovot, Israel
| | - Eran Segal
- Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Sascha Brunke
- Department of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural Product Research and Infection Biology—Hans Knoell Institute Jena (HKI), Jena, Germany
| | - Yitzhak Pilpel
- Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Ravid Straussman
- Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - David Zeevi
- Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Petra Bacher
- Institute of Immunology, Christian-Albrecht-University of Kiel, Kiel, Germany
- Institute of Clinical Molecular Biology, Christian-Albrecht-University of Kiel, Kiel, Germany
| | - Bernhard Hube
- Department of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural Product Research and Infection Biology—Hans Knoell Institute Jena (HKI), Jena, Germany
- Institute of Microbiology, Friedrich Schiller University, Jena, Germany
| | - Neta Shlezinger
- The Robert H. Smith Faculty of Agriculture, Food and Environment The Hebrew University of Jerusalem, Rehovot, Israel
| | - Steffen Jung
- Departments of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
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2
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Boura-Halfon S, Haffner-Krausz R, Ben-Dor S, Kim JS, Jung S. Tackling Tissue Macrophage Heterogeneity by SplitCre Transgenesis. Methods Mol Biol 2024; 2713:481-503. [PMID: 37639143 DOI: 10.1007/978-1-0716-3437-0_32] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Abstract
Macrophages represent a broad spectrum of distinct, but closely related tissue-resident immune cells. This presents a major challenge for the study of functional aspects of these cells using classical Cre recombinase-mediated conditional mutagenesis in mice, since single promoter-driven Cre transgenic models often display limited specificity toward their intended target. The advent of CRISPR/Cas9 technology has now provided a time- and cost-effective method to explore the full potential of binary transgenic, intersectional genetics. Specifically, the use of two promoters driving inactive Cre fragments that, when co-expressed, dimerize and only then gain recombinase activity allows the characterization and manipulation of genetically defined tissue macrophage subpopulations. Here, we will elaborate on the use of this protocol to capitalize on these recent technological advances in mouse genetics and discuss their strengths and pitfalls to improve the study of tissue macrophage subpopulations in physiology and pathophysiology.
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Affiliation(s)
- Sigalit Boura-Halfon
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.
| | | | - Shifra Ben-Dor
- Department of Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | - Jung-Seok Kim
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Steffen Jung
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.
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3
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Kim JS, Haimon Z, Boura-Halfon S, Jung S. Translatome Profiling of Tissue-Resident Macrophages Using the RiboTag Approach. Methods Mol Biol 2024; 2713:253-267. [PMID: 37639128 DOI: 10.1007/978-1-0716-3437-0_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Abstract
Global gene expression profiling has provided valuable insights into the specific contributions of different cell types to various physiological processes. Notably though, both bulk and single-cell transcriptomics require the prior retrieval of the cells from their tissue context to be analyzed. Isolation protocols for tissue macrophages are, however, notoriously inefficient and, moreover, prone to introduce considerable bias and artifacts. Here, we will discuss a valuable alternative, originally introduced by Amieux and colleagues. This so-called RiboTag approach allows, in combination with respective macrophage-specific Cre transgenic lines, to retrieve macrophage translatomes from crude tissue extracts. We will review our experience with this ingenious method, focusing on the study of brain macrophages, including microglia and border-associated cells. We will elaborate on the advantages of the RiboTag approach that render it a valuable complement to standard cell sorting-based profiling strategies, especially for the investigation of tissue macrophages.
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Affiliation(s)
- Jung-Seok Kim
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.
| | - Zhana Haimon
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Sigalit Boura-Halfon
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Steffen Jung
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.
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4
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Ordonez-Moreno LA, Haddad M, Chakrabarti P, Khatib-Massalha E, Fruchtman H, Boura-Halfon S, Petrovich-Kopitman E, Lapidot T, Kollet O. Lactate-a new player in G-CSF-induced mobilization of hematopoietic stem/progenitor cells. Leukemia 2023; 37:1757-1761. [PMID: 37138018 DOI: 10.1038/s41375-023-01917-w] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/17/2023] [Accepted: 04/21/2023] [Indexed: 05/05/2023]
Affiliation(s)
| | - Montaser Haddad
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Priyasmita Chakrabarti
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Eman Khatib-Massalha
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
- Wellcome-Medical Research Council (MRC) Cambridge Stem Cell Institute, University of Cambridge, Cambridge, UK
| | - Harry Fruchtman
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Sigalit Boura-Halfon
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | | | - Tsvee Lapidot
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.
| | - Orit Kollet
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.
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5
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Shemer A, Scheyltjens I, Frumer GR, Kim JS, Grozovski J, Ayanaw S, Dassa B, Van Hove H, Chappell-Maor L, Boura-Halfon S, Leshkowitz D, Mueller W, Maggio N, Movahedi K, Jung S. Interleukin-10 Prevents Pathological Microglia Hyperactivation following Peripheral Endotoxin Challenge. Immunity 2020; 53:1033-1049.e7. [PMID: 33049219 DOI: 10.1016/j.immuni.2020.09.018] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [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: 01/17/2020] [Revised: 08/06/2020] [Accepted: 09/23/2020] [Indexed: 01/08/2023]
Abstract
Microglia, the resident macrophages of the brain parenchyma, are key players in central nervous system (CNS) development, homeostasis, and disorders. Distinct brain pathologies seem associated with discrete microglia activation modules. How microglia regain quiescence following challenges remains less understood. Here, we explored the role of the interleukin-10 (IL-10) axis in restoring murine microglia homeostasis following a peripheral endotoxin challenge. Specifically, we show that lipopolysaccharide (LPS)-challenged mice harboring IL-10 receptor-deficient microglia displayed neuronal impairment and succumbed to fatal sickness. Addition of a microglial tumor necrosis factor (TNF) deficiency rescued these animals, suggesting a microglia-based circuit driving pathology. Single cell transcriptome analysis revealed various IL-10 producing immune cells in the CNS, including most prominently Ly49D+ NK cells and neutrophils, but not microglia. Collectively, we define kinetics of the microglia response to peripheral endotoxin challenge, including their activation and robust silencing, and highlight the critical role of non-microglial IL-10 in preventing deleterious microglia hyperactivation.
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Affiliation(s)
- Anat Shemer
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Isabelle Scheyltjens
- Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium; Lab of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Gal Ronit Frumer
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Jung-Seok Kim
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Jonathan Grozovski
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Serkalem Ayanaw
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Bareket Dassa
- Bioinformatics Unit, Life Science Core Facilities, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Hannah Van Hove
- Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium; Lab of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | | | | | - Dena Leshkowitz
- Bioinformatics Unit, Life Science Core Facilities, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Werner Mueller
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PT, UK
| | - Nicola Maggio
- Department of Neurology, The Chaim Sheba Medical Center, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, 5262 Tel Aviv, Israel
| | - Kiavash Movahedi
- Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium; Lab of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Steffen Jung
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel.
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6
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Gross-Vered M, Trzebanski S, Shemer A, Bernshtein B, Curato C, Stelzer G, Salame TM, David E, Boura-Halfon S, Chappell-Maor L, Leshkowitz D, Jung S. Defining murine monocyte differentiation into colonic and ileal macrophages. eLife 2020; 9:e49998. [PMID: 31916932 PMCID: PMC6952180 DOI: 10.7554/elife.49998] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 11/27/2019] [Indexed: 12/22/2022] Open
Abstract
Monocytes are circulating short-lived macrophage precursors that are recruited on demand from the blood to sites of inflammation and challenge. In steady state, classical monocytes give rise to vasculature-resident cells that patrol the luminal side of the endothelium. In addition, classical monocytes feed macrophage compartments of selected organs, including barrier tissues, such as the skin and intestine, as well as the heart. Monocyte differentiation under conditions of inflammation has been studied in considerable detail. In contrast, monocyte differentiation under non-inflammatory conditions remains less well understood. Here we took advantage of a combination of cell ablation and precursor engraftment to investigate the generation of gut macrophages from monocytes. Collectively, we identify factors associated with the gradual adaptation of monocytes to tissue residency. Moreover, comparison of monocyte differentiation into the colon and ileum-resident macrophages revealed the graduated acquisition of gut segment-specific gene expression signatures.
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Affiliation(s)
- Mor Gross-Vered
- Department of ImmunologyWeizmann Institute of ScienceRehovotIsrael
| | | | - Anat Shemer
- Department of ImmunologyWeizmann Institute of ScienceRehovotIsrael
| | - Biana Bernshtein
- Department of ImmunologyWeizmann Institute of ScienceRehovotIsrael
| | - Caterina Curato
- Department of ImmunologyWeizmann Institute of ScienceRehovotIsrael
| | - Gil Stelzer
- Bioinformatics Unit, Life Science Core FacilitiesWeizmann Institute of ScienceRehovotIsrael
| | - Tomer-Meir Salame
- Bioinformatics Unit, Life Science Core FacilitiesWeizmann Institute of ScienceRehovotIsrael
| | - Eyal David
- Department of ImmunologyWeizmann Institute of ScienceRehovotIsrael
| | | | | | - Dena Leshkowitz
- Bioinformatics Unit, Life Science Core FacilitiesWeizmann Institute of ScienceRehovotIsrael
| | - Steffen Jung
- Department of ImmunologyWeizmann Institute of ScienceRehovotIsrael
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7
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Herschkovitz A, Liu YF, Ilan E, Ronen D, Boura-Halfon S, Zick Y. Withdrawal: Common inhibitory serine sites phosphorylated by IRS-1 kinases, triggered by insulin and inducers of insulin resistance. J Biol Chem 2018; 293:7266. [DOI: 10.1074/jbc.w118.003468] [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: 11/06/2022] Open
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8
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Isaac R, Boura-Halfon S, Gurevitch D, Shainskaya A, Levkovitz Y, Zick Y. Selective serotonin reuptake inhibitors (SSRIs) inhibit insulin secretion and action in pancreatic β cells. J Biol Chem 2018; 293:4577-4578. [PMID: 29572328 DOI: 10.1074/jbc.aac118.002476] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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9
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Isaac R, Vinik Y, Boura-Halfon S, Farack L, Streim S, Elhanany E, Kam Z, Zick Y. Prolonged Elimination of Negative Feedback Control Mechanisms Along the Insulin Signaling Pathway Impairs β-Cell Function In Vivo. Diabetes 2017; 66:1879-1889. [PMID: 28424159 DOI: 10.2337/db16-0827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 04/06/2017] [Indexed: 11/13/2022]
Abstract
Cellular stress and proinflammatory cytokines induce phosphorylation of insulin receptor substrate (IRS) proteins at Ser sites that inhibit insulin and IGF-I signaling. We therefore examined the effects of mutation of five "inhibitory" Ser phosphorylation sites on IRS2 function in transgenic mice that overexpress, selectively in pancreatic β-cells, either wild-type (WT) or a mutated IRS2 protein (IRS25A). Islets size, number, and mRNA levels of catalase and superoxide dismutase were increased, whereas those of nitric oxide synthase were decreased, in 7- to 10-week-old IRS25A-β mice compared with IRS2WT-β mice. However, glucose homeostasis and insulin secretion in IRS25A-β mice were impaired when compared with IRS2WT-β mice or to nontransgenic mice. This was associated with reduced mRNA levels of Glut2 and islet β-cell transcription factors such as Nkx6.1 and MafA Similarly, components mediating the unfolded protein response were decreased in islets of IRS25A-β mice in accordance with their decreased insulin secretion. The beneficial effects of IRS25A on β-cell proliferation and β-cell transcription factors were evident only in 5- to 8-day-old mice. These findings suggest that elimination of inhibitory Ser phosphorylation sites of IRS2 exerts short-term beneficial effects in vivo; however, their sustained elimination leads to impaired β-cell function.
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Affiliation(s)
- Roi Isaac
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Yaron Vinik
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Sigalit Boura-Halfon
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Lydia Farack
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Sarina Streim
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Eytan Elhanany
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Zvi Kam
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Yehiel Zick
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
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10
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Mildner A, Chapnik E, Varol D, Aychek T, Lampl N, Rivkin N, Bringmann A, Paul F, Boura-Halfon S, Hayoun YS, Barnett-Itzhaki Z, Amit I, Hornstein E, Jung S. MicroRNA-142 controls thymocyte proliferation. Eur J Immunol 2017; 47:1142-1152. [PMID: 28471480 DOI: 10.1002/eji.201746987] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 04/03/2017] [Accepted: 04/28/2017] [Indexed: 01/25/2023]
Abstract
T-cell development is a spatially and temporally regulated process, orchestrated by well-defined contributions of transcription factors and cytokines. Here, we identify the noncoding RNA miR-142 as an additional regulatory layer within murine thymocyte development and proliferation. MiR-142 deficiency impairs the expression of cell cycle-promoting genes in mature mouse thymocytes and early progenitors, accompanied with increased levels of cyclin-dependent kinase inhibitor 1B (Cdkn1b, also known as p27Kip1 ). By using CRISPR/Cas9 technology to delete the miR-142-3p recognition element in the 3'UTR of cdkn1b, we confirm that this gene is a novel target of miR-142-3p in vivo. Increased Cdkn1b protein expression alone however was insufficient to cause proliferation defects in thymocytes, indicating the existence of additional critical miR-142 targets. Collectively, we establish a key role for miR-142 in the control of early and mature thymocyte proliferation, demonstrating the multifaceted role of a single miRNA on several target genes.
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Affiliation(s)
- Alexander Mildner
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Elik Chapnik
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Diana Varol
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Tegest Aychek
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Nardi Lampl
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Natalia Rivkin
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Anita Bringmann
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Franziska Paul
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | | | - Yifat Segal Hayoun
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | | | - Ido Amit
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Eran Hornstein
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Steffen Jung
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
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11
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Varol D, Mildner A, Blank T, Shemer A, Barashi N, Yona S, David E, Boura-Halfon S, Segal-Hayoun Y, Chappell-Maor L, Keren-Shaul H, Leshkowitz D, Hornstein E, Fuhrmann M, Amit I, Maggio N, Prinz M, Jung S. Dicer Deficiency Differentially Impacts Microglia of the Developing and Adult Brain. Immunity 2017. [DOI: 10.1016/j.immuni.2017.05.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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12
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Bucris E, Beck A, Boura-Halfon S, Isaac R, Vinik Y, Rosenzweig T, Sampson SR, Zick Y. Prolonged insulin treatment sensitizes apoptosis pathways in pancreatic β cells. J Endocrinol 2016; 230:291-307. [PMID: 27411561 DOI: 10.1530/joe-15-0505] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 06/27/2016] [Indexed: 12/11/2022]
Abstract
Insulin resistance results from impaired insulin signaling in target tissues that leads to increased levels of insulin required to control plasma glucose levels. The cycle of hyperglycemia and hyperinsulinemia eventually leads to pancreatic cell deterioration and death by a mechanism that is yet unclear. Insulin induces ROS formation in several cell types. Furthermore, death of pancreatic cells induced by oxidative stress could be potentiated by insulin. Here, we investigated the mechanism underlying this phenomenon. Experiments were done on pancreatic cell lines (Min-6, RINm, INS-1), isolated mouse and human islets, and on cell lines derived from nonpancreatic sources. Insulin (100nM) for 24h selectively increased the production of ROS in pancreatic cells and isolated pancreatic islets, but only slightly affected the expression of antioxidant enzymes. This was accompanied by a time- and dose-dependent decrease in cellular reducing power of pancreatic cells induced by insulin and altered expression of several ER stress response elements including a significant increase in Trb3 and a slight increase in iNos The effect on iNos did not increase NO levels. Insulin also potentiated the decrease in cellular reducing power induced by H2O2 but not cytokines. Insulin decreased the expression of MCL-1, an antiapoptotic protein of the BCL family, and induced a modest yet significant increase in caspase 3/7 activity. In accord with these findings, inhibition of caspase activity eliminated the ability of insulin to increase cell death. We conclude that prolonged elevated levels of insulin may prime apoptosis and cell death-inducing mechanisms as a result of oxidative stress in pancreatic cells.
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Affiliation(s)
- E Bucris
- Department of Molecular Cell BiologyWeizmann Institute of Science, Rehovot, Israel Mina and Everard Goodman Faculty of Life SciencesBar-Ilan University, Ramat-Gan, Israel
| | - A Beck
- Department of Molecular Cell BiologyWeizmann Institute of Science, Rehovot, Israel
| | - S Boura-Halfon
- Department of Molecular Cell BiologyWeizmann Institute of Science, Rehovot, Israel
| | - R Isaac
- Department of Molecular Cell BiologyWeizmann Institute of Science, Rehovot, Israel
| | - Y Vinik
- Department of Molecular Cell BiologyWeizmann Institute of Science, Rehovot, Israel
| | - T Rosenzweig
- Department of Molecular Biology and Nutritional StudiesAriel University, Ariel, Israel
| | - S R Sampson
- Department of Molecular Cell BiologyWeizmann Institute of Science, Rehovot, Israel Mina and Everard Goodman Faculty of Life SciencesBar-Ilan University, Ramat-Gan, Israel
| | - Y Zick
- Department of Molecular Cell BiologyWeizmann Institute of Science, Rehovot, Israel
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13
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Vinik Y, Shatz-Azoulay H, Vivanti A, Hever N, Levy Y, Karmona R, Brumfeld V, Baraghithy S, Attar-Lamdar M, Boura-Halfon S, Bab I, Zick Y. The mammalian lectin galectin-8 induces RANKL expression, osteoclastogenesis, and bone mass reduction in mice. eLife 2015; 4:e05914. [PMID: 25955862 PMCID: PMC4424493 DOI: 10.7554/elife.05914] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [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: 12/07/2014] [Accepted: 04/16/2015] [Indexed: 01/20/2023] Open
Abstract
Skeletal integrity is maintained by the co-ordinated activity of osteoblasts, the bone-forming cells, and osteoclasts, the bone-resorbing cells. In this study, we show that mice overexpressing galectin-8, a secreted mammalian lectin of the galectins family, exhibit accelerated osteoclasts activity and bone turnover, which culminates in reduced bone mass, similar to cases of postmenopausal osteoporosis and cancerous osteolysis. This phenotype can be attributed to a direct action of galectin-8 on primary cultures of osteoblasts that secrete the osteoclastogenic factor RANKL upon binding of galectin-8. This results in enhanced differentiation into osteoclasts of the bone marrow cells co-cultured with galectin-8-treated osteoblasts. Secretion of RANKL by galectin-8-treated osteoblasts can be attributed to binding of galectin-8 to receptor complexes that positively (uPAR and MRC2) and negatively (LRP1) regulate galectin-8 function. Our findings identify galectins as new players in osteoclastogenesis and bone remodeling, and highlight a potential regulation of bone mass by animal lectins. DOI:http://dx.doi.org/10.7554/eLife.05914.001 The forces applied to the body during daily activities cause bones to be constantly remodeled, which is essential for keeping them healthy. In most adult organisms, new bone is created at the same rate at which old bone is destroyed. This means that overall bone mass remains the same. But, in diseases such as osteoporosis or bone cancer, bone is destroyed more rapidly than at which new bone is made. This leads to brittle bones that are more likely to fracture. Understanding how to increase the rate of bone renewal might therefore help scientists develop new treatments for bone diseases. Bone is created by cells called osteoblasts and destroyed by other cells called osteoclasts. Both of these types of cells develop from stem cells in the bone marrow. The activity of these cells is controlled by a number of factors, including the matrix of proteins that holds bone together. A group of proteins called galectins are known to act as a bridge between some of the matrix proteins and molecules on the surface of the cells. Vinik et al. took osteoblasts from a mouse skull, grew them in the laboratory, and then exposed them to a galectin protein called galectin-8. This made the osteoblasts release a protein called RANKL, which is known to boost osteoclast activity. When osteoblasts that had been exposed to galectin-8 were grown alongside bone marrow stem cells, more of the stem cells developed into the bone-destroying osteoclasts. Mice that were genetically engineered to produce more galectin-8 than normal mice develop brittle bones, despite also creating new bone at a higher rate than do normal mice. This is because osteoclast activity increases at a greater rate, resulting in an overall loss of bone in these animals. This is similar to what occurs in some individuals with osteoporosis. These experiments therefore suggest that galectin-8 plays an important role in bone remodeling and that it may be a potential target for drugs that treat diseases that weaken bones. DOI:http://dx.doi.org/10.7554/eLife.05914.002
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Affiliation(s)
- Yaron Vinik
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Hadas Shatz-Azoulay
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Alessia Vivanti
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Navit Hever
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Yifat Levy
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Rotem Karmona
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Vlad Brumfeld
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel
| | - Saja Baraghithy
- Bone Laboratory, The Hebrew University of Jerusalem, Jerusalem, Israel
| | | | - Sigalit Boura-Halfon
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Itai Bab
- Bone Laboratory, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yehiel Zick
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
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14
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Kaushansky N, Eisenstein M, Boura-Halfon S, Hansen BE, Nielsen CH, Milo R, Zeilig G, Lassmann H, Altmann DM, Ben-Nun A. Role of a Novel Human Leukocyte Antigen-DQA1*01:02;DRB1*15:01 Mixed Isotype Heterodimer in the Pathogenesis of "Humanized" Multiple Sclerosis-like Disease. J Biol Chem 2015; 290:15260-78. [PMID: 25911099 DOI: 10.1074/jbc.m115.641209] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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: 02/12/2015] [Indexed: 11/06/2022] Open
Abstract
Gene-wide association and candidate gene studies indicate that the greatest effect on multiple sclerosis (MS) risk is driven by the HLA-DRB1*15:01 allele within the HLA-DR15 haplotype (HLA-DRB1*15:01-DQA1*01:02-DQB1*0602-DRB5*01:01). Nevertheless, linkage disequilibrium makes it difficult to define, without functional studies, whether the functionally relevant effect derives from DRB1*15:01 only, from its neighboring DQA1*01:02-DQB1*06:02 or DRB5*01:01 genes of HLA-DR15 haplotype, or from their combinations or epistatic interactions. Here, we analyzed the impact of the different HLA-DR15 haplotype alleles on disease susceptibility in a new "humanized" model of MS induced in HLA-transgenic (Tg) mice by human oligodendrocyte-specific protein (OSP)/claudin-11 (hOSP), one of the bona fide potential primary target antigens in MS. We show that the hOSP-associated MS-like disease is dominated by the DRB1*15:01 allele not only as the DRA1*01:01;DRB1*15:01 isotypic heterodimer but also, unexpectedly, as a functional DQA1*01:02;DRB1*15:01 mixed isotype heterodimer. The contribution of HLA-DQA1/DRB1 mixed isotype heterodimer to OSP pathogenesis was revealed in (DRB1*1501xDQB1*0602)F1 double-Tg mice immunized with hOSP(142-161) peptide, where the encephalitogenic potential of prevalent DRB1*1501/hOSP(142-161)-reactive Th1/Th17 cells is hindered due to a single amino acid difference in the OSP(142-161) region between humans and mice; this impedes binding of DRB1*1501 to the mouse OSP(142-161) epitope in the mouse CNS while exposing functional binding of mouse OSP(142-161) to DQA1*01:02;DRB1*15:01 mixed isotype heterodimer. This study, which shows for the first time a functional HLA-DQA1/DRB1 mixed isotype heterodimer and its potential association with disease susceptibility, provides a rationale for a potential effect on MS risk from DQA1*01:02 through functional DQA1*01:02;DRB1*15:01 antigen presentation. Furthermore, it highlights a potential contribution to MS risk also from interisotypic combination between products of neighboring HLA-DR15 haplotype alleles, in this case the DQA1/DRB1 combination.
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Affiliation(s)
| | - Miriam Eisenstein
- Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | | | - Bjarke Endel Hansen
- the Institute for Inflammation Research, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen University Hospital, Blegdamsvej 9, DK-2100 Copenhagen, Denmark
| | - Claus Henrik Nielsen
- the Institute for Inflammation Research, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen University Hospital, Blegdamsvej 9, DK-2100 Copenhagen, Denmark
| | - Ron Milo
- the Department of Neurology, Barzilai Medical Center, Faculty of Health Sciences, Ben-Gurion University of the Negev, Ashkelon 78278, Israel
| | - Gabriel Zeilig
- the Department of Neurological Rehabilitation, Chaim Sheba Medical Center, Tel Hashomer 52621, Israel, the Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv 6997801, Israel
| | - Hans Lassmann
- the Center for Brain Research, Department of Neuroimmunology, Medical University of Vienna, 1090 Vienna, Austria, and
| | - Daniel M Altmann
- the Department of Medicine, Imperial College, Hammersmith Hospital, London W12 0HS, United Kingdom
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15
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Geron E, Boura-Halfon S, Schejter ED, Shilo BZ. The Edges of Pancreatic Islet β Cells Constitute Adhesive and Signaling Microdomains. Cell Rep 2015; 10:317-325. [PMID: 25600867 DOI: 10.1016/j.celrep.2014.12.031] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 11/11/2014] [Accepted: 12/12/2014] [Indexed: 10/24/2022] Open
Abstract
Pancreatic islet β cells are organized in rosette-like structures around blood vessels and exhibit an artery-to-vein orientation, but they do not display the typical epithelial polarity. It is unclear whether these cells present a functional asymmetry related to their spatial organization. Here, we identify murine β cell edges, the sites at which adjacent cell faces meet at a sharp angle, as surface microdomains of cell-cell adhesion and signaling. The edges are marked by enrichment of F-actin and E-cadherin and are aligned between neighboring cells. The edge organization is E-cadherin contact dependent and correlates with insulin secretion capacity. Edges display elevated levels of glucose transporters and SNAP25 and extend numerous F-actin-rich filopodia. A similar β cell edge organization was observed in human islets. When stimulated, β cell edges exhibit high calcium levels. In view of the functional importance of intra-islet communication, the spatial architecture of their edges may prove fundamental for coordinating physiological insulin secretion.
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Affiliation(s)
- Erez Geron
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sigalit Boura-Halfon
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Eyal D Schejter
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ben-Zion Shilo
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel.
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16
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Zachut M, Honig H, Striem S, Zick Y, Boura-Halfon S, Moallem U. Periparturient dairy cows do not exhibit hepatic insulin resistance, yet adipose-specific insulin resistance occurs in cows prone to high weight loss. J Dairy Sci 2013; 96:5656-69. [DOI: 10.3168/jds.2012-6142] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Accepted: 05/04/2013] [Indexed: 11/19/2022]
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17
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Beck A, Vinik Y, Shatz-Azoulay H, Isaac R, Streim S, Jona G, Boura-Halfon S, Zick Y. Otubain 2 is a novel promoter of beta cell survival as revealed by siRNA high-throughput screens of human pancreatic islets. Diabetologia 2013; 56:1317-26. [PMID: 23515685 DOI: 10.1007/s00125-013-2889-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 02/28/2013] [Indexed: 12/19/2022]
Abstract
AIMS/HYPOTHESIS Pro-inflammatory cytokines induce death of beta cells and hamper engraftment of transplanted islet mass. Our aim was to reveal novel genes involved in this process, as a platform for innovative therapeutic approaches. METHODS Small interfering RNA (siRNA) high-throughput screening (HTS) of primary human islets was employed to identify novel genes involved in cytokine-induced beta cell apoptosis. Dispersed human islets from nine human donors, treated with a combination of TNF-α, IL-1β and IFN-γ were transfected with ∼730 different siRNAs. Caspase-3/7 activity was measured, results were analysed and potential anti- and pro-apoptotic genes were identified. RESULTS Dispersed human pancreatic islets appeared to be suitable targets for performance of siRNA HTS. Using this methodology we found a number of potential pro- and anti-apoptotic target hits that have not been previously associated with pancreatic beta cell death. One such hit was the de-ubiquitinating enzyme otubain 2 (OTUB2). OTUB2 knockdown increased caspase-3/7 activity in MIN6 cells and primary human islets and inhibited insulin secretion and increased nuclear factor-κB (NF-κB) activity both under basal conditions and following cytokine treatment. CONCLUSIONS Use of dispersed human islets provides a new platform for functional HTS in a highly physiological system. Employing this technique enabled the identification of OTUB2 as a novel promoter of viability and insulin secretion in human beta cells. OTUB2 acts through the inhibition of NF-κB signalling, which is deleterious to beta cell survival. siRNA screens of human islets may therefore identify new targets, such as OTUB2, for therapeutic intervention in type 1 diabetes and islet transplantation.
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Affiliation(s)
- A Beck
- Department of Molecular Cell Biology, Weizmann Institute of Science, 234 Herzl Street, Rehovot 76100, Israel
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18
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Park JW, Park WJ, Kuperman Y, Boura-Halfon S, Pewzner-Jung Y, Futerman AH. Ablation of very long acyl chain sphingolipids causes hepatic insulin resistance in mice due to altered detergent-resistant membranes. Hepatology 2013; 57:525-32. [PMID: 22911490 DOI: 10.1002/hep.26015] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Accepted: 08/08/2012] [Indexed: 12/11/2022]
Abstract
UNLABELLED Sphingolipids are important structural components of cell membranes and act as critical regulators of cell function by modulating intracellular signaling pathways. Specific sphingolipids, such as ceramide, glucosylceramide, and ganglioside GM3, have been implicated in various aspects of insulin resistance, because they have been shown to modify several steps in the insulin signaling pathway, such as phosphorylation of either protein kinase B (Akt) or of the insulin receptor. We now explore the role of the ceramide acyl chain length in insulin signaling by using a ceramide synthase 2 (CerS2) null mouse, which is unable to synthesize very long acyl chain (C22-C24) ceramides. CerS2 null mice exhibited glucose intolerance despite normal insulin secretion from the pancreas. Both insulin receptor and Akt phosphorylation were abrogated in liver, but not in adipose tissue or in skeletal muscle. The lack of insulin receptor phosphorylation in liver correlated with its inability to translocate into detergent-resistant membranes (DRMs). Moreover, DRMs in CerS2 null mice displayed properties significantly different from those in wild-type mice, suggesting that the altered sphingolipid acyl chain length directly affects insulin receptor translocation and subsequent signaling. CONCLUSION We conclude that the sphingolipid acyl chain composition of liver regulates insulin signaling by modifying insulin receptor translocation into membrane microdomains.
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Affiliation(s)
- Joo-Won Park
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel
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19
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Isaac R, Boura-Halfon S, Gurevitch D, Shainskaya A, Levkovitz Y, Zick Y. Selective serotonin reuptake inhibitors (SSRIs) inhibit insulin secretion and action in pancreatic β cells. J Biol Chem 2012; 288:5682-93. [PMID: 23275337 DOI: 10.1074/jbc.m112.408641] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Selective serotonin reuptake inhibitors (SSRIs) are antidepressants used for the treatment of mood and anxiety disorders. Here, we demonstrate that incubation (2 h) of murine islets or Min6 β cell line with the SSRIs paroxetine, fluoxetine, or sertraline inhibited insulin-induced Tyr phosphorylation of insulin receptor substrate (IRS)-2 protein and the activation of its downstream targets Akt and the ribosomal protein S6 kinase-1 (S6K1). Inhibition was dose-dependent with half-maximal effects at ∼15-20 μM. It correlated with a rapid dephosphorylation and activation of the IRS kinase GSK3β. Introduction of GSK3β siRNAs eliminated the inhibitory effects of the SSRIs. Inhibition of IRS-2 action by 30 μM SSRI was associated with a marked inhibition of glucose-stimulated insulin secretion from murine and human pancreatic islets. Secretion induced by basic secretagogues (KCl and Arg) was not affected by these drugs. Prolonged treatment (16 h) of Min6 cells with sertraline resulted in the induction of inducible nitric oxide synthase; activation of endoplasmic reticulum stress, and the initiation of the unfolded protein response, manifested by enhanced transcription of ATF4 and C/EBP homologous protein. This triggered an apoptotic process, manifested by enhanced caspase 3/7 activity, which resulted in β cell death. These findings implicate SSRIs as inhibitors of IRS protein function and insulin action through the activation of GSK3β. They further suggest that SSRIs inhibit insulin secretion; induce the unfolded protein response; activate an apoptotic process, and trigger β cell death. Given that SSRIs promote insulin resistance while inhibiting insulin secretion, these drugs might accelerate the transition from an insulin-resistant state to overt diabetes.
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Affiliation(s)
- Roi Isaac
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100 Israel
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20
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Boura-Halfon S, Shuster-Meiseles T, Beck A, Petrovich K, Gurevitch D, Ronen D, Zick Y. A novel domain mediates insulin-induced proteasomal degradation of insulin receptor substrate 1 (IRS-1). Mol Endocrinol 2010; 24:2179-92. [PMID: 20843941 PMCID: PMC5417385 DOI: 10.1210/me.2010-0072] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 08/16/2010] [Indexed: 11/19/2022] Open
Abstract
Insulin receptor substrate-1 (IRS-1) plays a pivotal role in insulin signaling, therefore its degradation is exquisitely regulated. Here, we show that insulin-stimulated degradation of IRS-1 requires the presence of a highly conserved Ser/Thr-rich domain that we named domain involved in degradation of IRS-1 (DIDI). DIDI (amino acids 386-430 of IRS-1) was identified by comparing the intracellular degradation rate of several truncated forms of IRS-1 transfected into CHO cells. The isolated DIDI domain underwent insulin-stimulated Ser/Thr phosphorylation, suggesting that it serves as a target for IRS-1 kinases. The effects of deletion of DIDI were studied in Fao rat hepatoma and in CHO cells expressing Myc-IRS-1(WT) or Myc-IRS-1(Δ386-430). Deletion of DIDI maintained the ability of IRS-1(Δ386-434) to undergo ubiquitination while rendering it insensitive to insulin-induced proteasomal degradation, which affected IRS-1(WT) (80% at 8 h). Consequently, IRS-1(Δ386-434) mediated insulin signaling (activation of Akt and glycogen synthesis) better than IRS-1(WT). IRS-1(Δ386-434) exhibited a significant greater preference for nuclear localization, compared with IRS-1(WT). Higher nuclear localization was also observed when cells expressing IRS-1(WT) were incubated with the proteasome inhibitor MG-132. The sequence of DIDI is conserved more than 93% across species, from fish to mammals, as opposed to approximately 40% homology of the entire IRS-1. These findings implicate DIDI as a novel, highly conserved domain of IRS-1, which mediates its cellular localization, rate of degradation, and biological activity, with a direct impact on insulin signal transduction.
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Affiliation(s)
- Sigalit Boura-Halfon
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot, 76100, Israel
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21
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Gurevitch D, Boura-Halfon S, Isaac R, Shahaf G, Alberstein M, Ronen D, Lewis EC, Zick Y. Elimination of negative feedback control mechanisms along the insulin signaling pathway improves beta-cell function under stress. Diabetes 2010; 59:2188-97. [PMID: 20547979 PMCID: PMC2927941 DOI: 10.2337/db09-0890] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
OBJECTIVE Cellular stress and proinflammatory cytokines induce phosphorylation of insulin receptor substrate (IRS) proteins at Ser sites that inhibit insulin and IGF-1 signaling. Here, we examined the role of Ser phosphorylation of IRS-2 in mediating the inhibitory effects of proinflammatory cytokines and cellular stress on beta-cell function. RESEARCH DESIGN AND METHODS Five potential inhibitory Ser sites located proximally to the P-Tyr binding domain of IRS-2 were mutated to Ala. These IRS-2 mutants, denoted IRS-2(5A), and their wild-type controls (IRS-2(WT)) were introduced into adenoviral constructs that were infected into Min6 cells or into cultured murine islets. RESULTS When expressed in cultured mouse islets, IRS-2(5A) was better than IRS-2(WT) in protecting beta-cells from apoptosis induced by a combination of IL-1beta, IFN-gamma, TNF-alpha, and Fas ligand. Cytokine-treated islets expressing IRS2(5A) secreted significantly more insulin in response to glucose than did islets expressing IRS-2(WT). This could be attributed to the higher transcription of Pdx1 in cytokine-treated islets that expressed IRS-2(5A). Accordingly, transplantation of 200 islets expressing IRS2(5A) into STZ-induced diabetic mice restored their ability to respond to a glucose load similar to naïve mice. In contrast, mice transplanted with islets expressing IRS2(WT) maintained sustained hyperglycemia 3 days after transplantation. CONCLUSIONS Elimination of a physiological negative feedback control mechanism along the insulin-signaling pathway that involves Ser/Thr phosphorylation of IRS-2 affords protection against the adverse effects of proinflammatory cytokines and improves beta-cell function under stress. Genetic approaches that promote IRS2(5A) expression in pancreatic beta-cells, therefore, could be considered a rational treatment against beta-cell failure after islet transplantation.
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Affiliation(s)
- Diana Gurevitch
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Sigalit Boura-Halfon
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Roi Isaac
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Galit Shahaf
- Department of Clinical Biochemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Moti Alberstein
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Denise Ronen
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Eli C. Lewis
- Department of Clinical Biochemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Yehiel Zick
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
- Corresponding author: Yehiel Zick,
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Abstract
Insulin signaling at target tissues is essential for growth and development and for normal homeostasis of glucose, fat, and protein metabolism. Control over this process is therefore tightly regulated. It can be achieved by a negative feedback control mechanism whereby downstream components inhibit upstream elements along the insulin-signaling pathway (autoregulation) or by signals from apparently unrelated pathways that inhibit insulin signaling thus leading to insulin resistance. Phosphorylation of insulin receptor substrate (IRS) proteins on serine residues has emerged as a key step in these control processes under both physiological and pathological conditions. The list of IRS kinases implicated in the development of insulin resistance is growing rapidly, concomitant with the list of potential Ser/Thr phosphorylation sites in IRS proteins. Here, we review a range of conditions that activate IRS kinases to phosphorylate IRS proteins on "hot spot" domains. The flexibility vs. specificity features of this reaction is discussed and its characteristic as an "array" phosphorylation is suggested. Finally, its implications on insulin signaling, insulin resistance and type 2 diabetes, an emerging epidemic of the 21st century are outlined.
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Affiliation(s)
- Sigalit Boura-Halfon
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, 76100 Israel
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23
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Abstract
Signaling of insulin and insulin-like growth factor-I (IGF-1) at target tissues is essential for growth, development and for normal homeostasis of glucose, fat, and protein metabolism. Control over this process is therefore tightly regulated. It can be achieved by a negative-feedback control mechanism, whereby downstream components inhibit upstream elements along the insulin and IGF-1 signaling pathway or by signals from other pathways that inhibit insulin/IGF-1 signaling thus leading to insulin/IGF-1 resistance. Phosphorylation of insulin receptor substrates (IRS) proteins on serine residues has emerged as a key step in these control processes both under physiological and pathological conditions. The list of IRS kinases is growing rapidly, concomitant with the list of potential Ser/Thr phosphorylation sites in IRS proteins. Here we review a range of conditions that activate IRS kinases to phosphorylate IRS proteins on selected domains. The specificity of this reaction is discussed and its characteristic as an "array" phosphorylation is suggested. Finally, its implications on insulin/IGF-1 signaling, insulin/IGF-1 resistance and diabetes, an emerging epidemic of the twenty-first century are outlined.
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Affiliation(s)
- Sigalit Boura-Halfon
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel
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24
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Herschkovitz A, Liu YF, Ilan E, Ronen D, Boura-Halfon S, Zick Y. Common Inhibitory Serine Sites Phosphorylated by IRS-1 Kinases, Triggered by Insulin and Inducers of Insulin Resistance. J Biol Chem 2007; 282:18018-18027. [PMID: 17446166 DOI: 10.1074/jbc.m610949200] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Insulin Receptor Substrate (IRS) proteins are key players in insulin signal transduction and are the best studied targets of the insulin receptor. Ser/Thr phosphorylation of IRS proteins negatively modulates insulin signaling; therefore, the identification of IRS kinases and their target Ser phosphorylation sites is of physiological importance. Here we show that in Fao rat hepatoma cells, the IkappaB kinase beta (IKKbeta) is an IRS-1 kinase activated by selected inducers of insulin resistance, including sphingomyelinase, ceramide, and free fatty acids. Moreover, IKKbeta shares a repertoire of seven potential target sites on IRS-1 with protein kinase C zeta (PKCzeta), an IRS-1 kinase activated both by insulin and by inducers of insulin resistance. We further show that mutation of these seven sites (Ser-265, Ser-302, Ser-325, Ser-336, Ser-358, Ser-407, and Ser-408) confers protection from the action of IKKbeta and PKCzeta when they are overexpressed in Fao cells or primary hepatocytes. This enables the mutated IRS proteins to better propagate insulin signaling. These findings suggest that insulin-stimulated IRS kinases such as PKCzeta overlap with IRS kinases triggered by inducers of insulin resistance, such as IKKbeta, to phosphorylate IRS-1 on common Ser sites.
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Affiliation(s)
- Avia Herschkovitz
- Department of Molecular Cell Biology, The Weizmann Institute of Science, The Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
| | - Yan-Fang Liu
- Department of Molecular Cell Biology, The Weizmann Institute of Science, The Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
| | - Erez Ilan
- Institute of Biochemistry, Food Science, and Nutrition, Faculty of Agricultural, Food, and Environmental Quality, The Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
| | - Denise Ronen
- Department of Molecular Cell Biology, The Weizmann Institute of Science, The Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
| | - Sigalit Boura-Halfon
- Department of Molecular Cell Biology, The Weizmann Institute of Science, The Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
| | - Yehiel Zick
- Department of Molecular Cell Biology, The Weizmann Institute of Science, The Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel.
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Liu YF, Herschkovitz A, Boura-Halfon S, Ronen D, Paz K, Leroith D, Zick Y. Serine phosphorylation proximal to its phosphotyrosine binding domain inhibits insulin receptor substrate 1 function and promotes insulin resistance. Mol Cell Biol 2004; 24:9668-81. [PMID: 15485932 PMCID: PMC522236 DOI: 10.1128/mcb.24.21.9668-9681.2004] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Ser/Thr phosphorylation of insulin receptor substrate (IRS) proteins negatively modulates insulin signaling. Therefore, the identification of serine sites whose phosphorylation inhibit IRS protein functions is of physiological importance. Here we mutated seven Ser sites located proximal to the phosphotyrosine binding domain of insulin receptor substrate 1 (IRS-1) (S265, S302, S325, S336, S358, S407, and S408) into Ala. When overexpressed in rat hepatoma Fao or CHO cells, the mutated IRS-1 protein in which the seven Ser sites were mutated to Ala (IRS-1(7A)), unlike wild-type IRS-1 (IRS-1(WT)), maintained its Tyr-phosphorylated active conformation after prolonged insulin treatment or when the cells were challenged with inducers of insulin resistance prior to acute insulin treatment. This was due to the ability of IRS-1(7A) to remain complexed with the insulin receptor (IR), unlike IRS-1(WT), which underwent Ser phosphorylation, resulting in its dissociation from IR. Studies of truncated forms of IRS-1 revealed that the region between amino acids 365 to 430 is a main insulin-stimulated Ser phosphorylation domain. Indeed, IRS-1 mutated only at S408, which undergoes phosphorylation in vivo, partially maintained the properties of IRS-1(7A) and conferred protection against selected inducers of insulin resistance. These findings suggest that S408 and additional Ser sites among the seven mutated Ser sites are targets for IRS-1 kinases that play a key negative regulatory role in IRS-1 function and insulin action. These sites presumably serve as points of convergence, where physiological feedback control mechanisms, which are triggered by insulin-stimulated IRS kinases, overlap with IRS kinases triggered by inducers of insulin resistance to terminate insulin signaling.
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Affiliation(s)
- Yan-Fang Liu
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel
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Abstract
Internalization of the insulin receptor (IR) is a highly regulated multi-step process whose underlying molecular basis is not fully understood. Here we undertook to study the role of extracellular matrix (ECM) proteins in the modulation of IR internalization. Employing Chinese hamster ovary cells that overexpress IR (CHO-T cells), our results indicate that IR internalization proceeds unaffected even when Tyr phosphorylation of IR substrates, such as IRS-1, is impaired (e.g. in CHO-T cells overexpressing IRS-1 whose pleckstrin-homology domain has been deleted or in CHO-T cells that overexpress the PH/PTB domain of IRS-1). In contrast, IR internalization is affected by the context of the ECM proteins to which the cells adhere. Hence, IR internalization was inhibited 40-60% in CHO-T cells adherent onto galectin-8 (an ECM protein and an integrin ligand of the galectin family) when compared with cells adherent onto fibronectin, collagen, or laminin. Cells adherent to galectin-8 manifested a unique cytoskeletal organization, which involved formation of cortical actin and generation of F-actin microspikes that contrasted with the prominent stress-fibers formed when cells adhered to fibronectin. To better establish a role for actin filament organization in IR endocytosis, this process was assayed in CHO-T cells (adherent onto fibronectin), whose actin filaments were disrupted upon treatment with latrunculin B. Latrunculin B did not affect insulin-induced Tyr phosphorylation of IR or its ability to phosphorylate its substrates; still, a 30-50% reduction in the rate of IR internalization was observed in cells treated with latrunculin B. Treatment of cells with nocodazole, which disrupts formation of microtubules, did not affect IR internalization. These results indicate that proper actin, but not microtubular, organization is a critical requirement for IR internalization and suggest that integrin-mediated signaling pathways emitted upon cell adhesion to different extracellular matrices and the altered cytoskeletal organizations generated thereof affect the itinerary of the insulin receptor.
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Affiliation(s)
- Sigalit Boura-Halfon
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel
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Paz K, Boura-Halfon S, Wyatt LS, LeRoith D, Zick Y. The juxtamembrane but not the carboxyl-terminal domain of the insulin receptor mediates insulin's metabolic functions in primary adipocytes and cultured hepatoma cells. J Mol Endocrinol 2000; 24:419-32. [PMID: 10828835 DOI: 10.1677/jme.0.0240419] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Insulin-stimulated signaling pathways are activated upon interactions between the intracellular domains of the receptor and its downstream effectors. Insulin receptor substrate proteins (IRS-1, -2, -3 and -4) are the best-studied substrates for the insulin receptor kinase (IRK). We have previously shown that IRS-1 and IRS-2 interact with the juxtamembrane (JM) but not with the carboxyl-terminal (CT) region of the insulin receptor (IR) in vitro. However, the precise role of these IR regions in mediating insulin's bioeffects is still unresolved. In the present work we made use of vaccinia virus as a vector for quantitative expression of the JM and CT domains within the cytoplasm of physiologically insulin-responsive primary rat adipocytes and rat hepatoma Fao cells. We could demonstrate that overexpression of either the JM or the CT domains did not inhibit either insulin binding or insulin-stimulated receptor autophosphorylation. In contrast, metabolic effects such as insulin-induced glucose utilization in adipocytes, and insulin-induced amino acid utilization in Fao hepatoma cells were inhibited (70-80%) in cells overexpressing the JM but not the CT domains of IR. The inhibitory effects of the overexpressed JM domain were accompanied by inhibition of insulin-stimulated IRS-1 phosphorylation, decreased IRS-1-associated PI3K activity, and decreased phosphorylation of the downstream effectors of PI3K, PKB and p70 S6K. Insulin-stimulated thymidine incorporation in Fao cells was also inhibited (40%) upon overexpression of the JM but not the CT region of IR. Our findings suggest that interactions between the JM region of IR and its downstream effectors are obligatory for insulin-stimulated metabolic functions in physiologically relevant insulin responsive cells. They also rule out the possibility that interaction of proteins, including PI3K, with the CT domain can provide an alternative pathway.
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Affiliation(s)
- K Paz
- Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot 76100, Israel
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