1
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Sachs W, Blume L, Loreth D, Schebsdat L, Hatje F, Koehler S, Wedekind U, Sachs M, Zieliniski S, Brand J, Conze C, Florea BI, Heppner F, Krüger E, Rinschen MM, Kretz O, Thünauer R, Meyer-Schwesinger C. The proteasome modulates endocytosis specifically in glomerular cells to promote kidney filtration. Nat Commun 2024; 15:1897. [PMID: 38429282 PMCID: PMC10907641 DOI: 10.1038/s41467-024-46273-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 02/16/2024] [Indexed: 03/03/2024] Open
Abstract
Kidney filtration is ensured by the interaction of podocytes, endothelial and mesangial cells. Immunoglobulin accumulation at the filtration barrier is pathognomonic for glomerular injury. The mechanisms that regulate filter permeability are unknown. Here, we identify a pivotal role for the proteasome in a specific cell type. Combining genetic and inhibitor-based human, pig, mouse, and Drosophila models we demonstrate that the proteasome maintains filtration barrier integrity, with podocytes requiring the constitutive and glomerular endothelial cells the immunoproteasomal activity. Endothelial immunoproteasome deficiency as well as proteasome inhibition disrupt the filtration barrier in mice, resulting in pathologic immunoglobulin deposition. Mechanistically, we observe reduced endocytic activity, which leads to altered membrane recycling and endocytic receptor turnover. This work expands the concept of the (immuno)proteasome as a control protease orchestrating protein degradation and antigen presentation and endocytosis, providing new therapeutic targets to treat disease-associated glomerular protein accumulations.
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Affiliation(s)
- Wiebke Sachs
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Lukas Blume
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Desiree Loreth
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Lisa Schebsdat
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Favian Hatje
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Sybille Koehler
- Hamburg Center of Kidney Health, Hamburg, Germany
- Nephrology, III Medical Clinic, Department of Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Uta Wedekind
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Marlies Sachs
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Stephanie Zieliniski
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | - Johannes Brand
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Hamburg Center of Kidney Health, Hamburg, Germany
| | | | - Bogdan I Florea
- Bio-Organic Synthesis Group, Leiden University, Leiden, The Netherlands
| | - Frank Heppner
- Institute of Neuropathology, Charité, Berlin, Germany
| | - Elke Krüger
- Institute of Medical Biochemistry and Molecular Biology, University Medicine Greifswald, Greifswald, Germany
| | - Markus M Rinschen
- Hamburg Center of Kidney Health, Hamburg, Germany
- Nephrology, III Medical Clinic, Department of Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Oliver Kretz
- Hamburg Center of Kidney Health, Hamburg, Germany
- Nephrology, III Medical Clinic, Department of Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Roland Thünauer
- Leibniz Institute of Virology, Hamburg, Germany
- Technology Platform Light Microscopy (TPLM), University Hamburg, Hamburg, Germany
- Advanced Light and Fluorescence Microscopy (ALFM) Facility at the Centre for Structural Systems Biology (CSSB), Hamburg, Germany
| | - Catherine Meyer-Schwesinger
- Institute of Cellular and Integrative Physiology, Center for Experimental Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
- Hamburg Center of Kidney Health, Hamburg, Germany.
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2
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Alio I, Moll R, Hoffmann T, Mamat U, Schaible UE, Pappenfort K, Alawi M, Schie M, Thünauer R, Stamm J, Rohde H, Streit WR. Stenotrophomonas maltophilia affects the gene expression profiles of the major pathogens Pseudomonas aeruginosa and Staphylococcus aureus in an in vitro multispecies biofilm model. Microbiol Spectr 2023; 11:e0085923. [PMID: 37819084 PMCID: PMC10714729 DOI: 10.1128/spectrum.00859-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 08/21/2023] [Indexed: 10/13/2023] Open
Abstract
IMPORTANCE In the past, studies have focused on bacterial pathogenicity in mono-species infections, in part ignoring the clinical relevance of diseases caused by more than one pathogen (i.e., polymicrobial infections). However, it is now common knowledge that multiple bacteria species are often involved in the course of an infection. For treatment of such infections, it is absolutely important to understand the dynamics of species interactions at possible infection sites and the molecular mechanisms behind these interactions. Here, we studied the impact of Stenotrophomonas maltophilia on its commensals Pseudomonas aeruginosa and Staphylococcus aureus in multispecies biofilms. We analyzed the 3D structural architectures of dual- and triple-species biofilms, niche formation within the biofilms, and the interspecies interactions on a molecular level. RNAseq data identified key genes involved in multispecies biofilm formation and interaction as potential drug targets for the clinical combat of multispecies infection with these major pathogens.
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Affiliation(s)
- Ifey Alio
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Raphael Moll
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Tim Hoffmann
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Uwe Mamat
- Cellular Microbiology, Priority Research Area Infections, Research Center Borstel, Leibniz Lung Center,Leibniz Research Alliance Infection , Borstel Gemany, Borstel, Germany
| | - Ulrich E. Schaible
- Cellular Microbiology, Priority Research Area Infections, Research Center Borstel, Leibniz Lung Center,Leibniz Research Alliance Infection , Borstel Gemany, Borstel, Germany
| | - Kai Pappenfort
- Institute of Microbiology, Friedrich Schiller University of Jena, Jena, Germany
| | - Malik Alawi
- Bioinformatics Core, UKE Hamburg, Hamburg, Germany
| | - Marcel Schie
- LIV, Leibniz Institute of Experimental Virology, Hamburg, Germany
| | - Roland Thünauer
- LIV, Leibniz Institute of Experimental Virology, Hamburg, Germany
| | - Johanna Stamm
- Institute for Medical Microbiology, Virology and Hygiene, UKE, Eppendorf, Hamburg, Germany
| | - Holger Rohde
- Institute for Medical Microbiology, Virology and Hygiene, UKE, Eppendorf, Hamburg, Germany
| | - Wolfgang R. Streit
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
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3
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Kaltenbach L, Martzloff P, Bambach SK, Aizarani N, Mihlan M, Gavrilov A, Glaser KM, Stecher M, Thünauer R, Thiriot A, Heger K, Kierdorf K, Wienert S, von Andrian UH, Schmidt-Supprian M, Nerlov C, Klauschen F, Roers A, Bajénoff M, Grün D, Lämmermann T. Slow integrin-dependent migration organizes networks of tissue-resident mast cells. Nat Immunol 2023; 24:915-924. [PMID: 37081147 PMCID: PMC10232366 DOI: 10.1038/s41590-023-01493-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 03/15/2023] [Indexed: 04/22/2023]
Abstract
Immune cell locomotion is associated with amoeboid migration, a flexible mode of movement, which depends on rapid cycles of actin polymerization and actomyosin contraction1. Many immune cells do not necessarily require integrins, the major family of adhesion receptors in mammals, to move productively through three-dimensional tissue spaces2,3. Instead, they can use alternative strategies to transmit their actin-driven forces to the substrate, explaining their migratory adaptation to changing external environments4-6. However, whether these generalized concepts apply to all immune cells is unclear. Here, we show that the movement of mast cells (immune cells with important roles during allergy and anaphylaxis) differs fundamentally from the widely applied paradigm of interstitial immune cell migration. We identify a crucial role for integrin-dependent adhesion in controlling mast cell movement and localization to anatomical niches rich in KIT ligand, the major mast cell growth and survival factor. Our findings show that substrate-dependent haptokinesis is an important mechanism for the tissue organization of resident immune cells.
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Affiliation(s)
- Lukas Kaltenbach
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- International Max Planck Research School for Immunobiology, Epigenetics and Metabolism (IMPRS-IEM), Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Paloma Martzloff
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- International Max Planck Research School for Immunobiology, Epigenetics and Metabolism (IMPRS-IEM), Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Sarah K Bambach
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- International Max Planck Research School for Immunobiology, Epigenetics and Metabolism (IMPRS-IEM), Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Nadim Aizarani
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- Friedrich Miescher Institute for Biomedical Research (FMI), Basel, Switzerland
| | - Michael Mihlan
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Alina Gavrilov
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Katharina M Glaser
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- International Max Planck Research School for Immunobiology, Epigenetics and Metabolism (IMPRS-IEM), Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Manuel Stecher
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
- International Max Planck Research School for Immunobiology, Epigenetics and Metabolism (IMPRS-IEM), Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Roland Thünauer
- Advanced Light and Fluorescence Microscopy Facility, Centre for Structural Systems Biology (CSSB) and University of Hamburg, Hamburg, Germany
- Leibniz Institute of Virology (LIV), Hamburg, Germany
| | - Aude Thiriot
- Department of Immunology and HMS Center for Immune Imaging, Harvard Medical School, Boston, MA, USA
- The Ragon Institute of MGH, MIT and Harvard, Cambridge, MA, USA
| | - Klaus Heger
- Department of Cancer Immunology, Genentech, South San Francisco, CA, USA
| | - Katrin Kierdorf
- Institute of Neuropathology, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- CIBSS-Center for Integrative Biological Signaling Studies, University of Freiburg, Freiburg, Germany
- Center for Basics in NeuroModulation (NeuroModulBasics), Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Stephan Wienert
- Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Pathology, Berlin, Germany
| | - Ulrich H von Andrian
- Department of Immunology and HMS Center for Immune Imaging, Harvard Medical School, Boston, MA, USA
- The Ragon Institute of MGH, MIT and Harvard, Cambridge, MA, USA
| | - Marc Schmidt-Supprian
- Institute of Experimental Hematology, Center for Translational Cancer Research (TranslaTUM), School of Medicine, Technical University of Munich, Munich, Germany
| | - Claus Nerlov
- MRC Molecular Hematology Unit, MRC Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - Frederick Klauschen
- Institute of Pathology, Ludwig-Maximilians-University, Munich, Germany
- Berlin Institute for the Foundation of Learning and Data (BIFOLD) and Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Axel Roers
- Institute for Immunology, Universitätsklinikum Heidelberg, Heidelberg, Germany
| | - Marc Bajénoff
- Aix Marseille University, CNRS, INSERM, Centre d'Immunologie de Marseille-Luminy, Marseille, France
| | - Dominic Grün
- Würzburg Institute of Systems Immunology, Max Planck Research Group at the Julius-Maximilians-Universität Würzburg, Würzburg, Germany
- Helmholtz Institute for RNA-Based Infection Research (HIRI), Helmholtz Centre for infection Research (HZI), Würzburg, Germany
| | - Tim Lämmermann
- Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany.
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4
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Jordan-Paiz A, Martrus G, Steinert FL, Kaufmann M, Sagebiel AF, Schreurs RRCE, Rechtien A, Baumdick ME, Jung JM, Möller KJ, Wegner L, Grüttner C, Richert L, Thünauer R, Schroeder-Schwarz J, van Goudoever JB, Geijtenbeek TBH, Altfeld M, Pals ST, Perez D, Klarenbeek PL, Tomuschat C, Sauter G, Königs I, Schumacher U, Friese MA, Melling N, Reinshagen K, Bunders MJ. CXCR5 +PD-1 ++ CD4 + T cells colonize infant intestines early in life and promote B cell maturation. Cell Mol Immunol 2023; 20:201-213. [PMID: 36600048 PMCID: PMC9886971 DOI: 10.1038/s41423-022-00944-4] [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] [Received: 01/18/2022] [Accepted: 10/26/2022] [Indexed: 01/06/2023] Open
Abstract
Gastrointestinal infections are a major cause for serious clinical complications in infants. The induction of antibody responses by B cells is critical for protective immunity against infections and requires CXCR5+PD-1++ CD4+ T cells (TFH cells). We investigated the ontogeny of CXCR5+PD-1++ CD4+ T cells in human intestines. While CXCR5+PD-1++ CD4+ T cells were absent in fetal intestines, CXCR5+PD-1++ CD4+ T cells increased after birth and were abundant in infant intestines, resulting in significant higher numbers compared to adults. These findings were supported by scRNAseq analyses, showing increased frequencies of CD4+ T cells with a TFH gene signature in infant intestines compared to blood. Co-cultures of autologous infant intestinal CXCR5+PD-1+/-CD4+ T cells with B cells further demonstrated that infant intestinal TFH cells were able to effectively promote class switching and antibody production by B cells. Taken together, we demonstrate that functional TFH cells are numerous in infant intestines, making them a promising target for oral pediatric vaccine strategies.
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Affiliation(s)
- Ana Jordan-Paiz
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
| | - Glòria Martrus
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
| | - Fenja L Steinert
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
- University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Max Kaufmann
- Institute of Neuroimmunology and Multiple Sclerosis, Center for Molecular Neurobiology Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, 20251, Germany
| | - Adrian F Sagebiel
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
- Department of General, Visceral and Thoracic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Renée R C E Schreurs
- Department of Experimental Immunology; Amsterdam Infection & Immunity Institute, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, 1105 AZ, The Netherlands
- Department of Pediatrics, Emma Children's Hospital, Amsterdam University Medical Center, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, 1105 AZ, The Netherlands
| | - Anne Rechtien
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
- I. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
- Partner Site Hamburg-Lübeck-Borstel-Riems, German Center for Infection Research (DZIF), Hamburg, 20246, Germany
| | - Martin E Baumdick
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
| | - Johannes M Jung
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
| | - Kimberly J Möller
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
- University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Lucy Wegner
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
- University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Cordula Grüttner
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
| | - Laura Richert
- University of Bordeaux, Institut National de la Santé et de la Recherche Médicale, Bordeaux Population Health Research Center UMR1219 and INRIA SISTM Team, Bordeaux, 33000, France
| | - Roland Thünauer
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
| | - Jennifer Schroeder-Schwarz
- Institute of Anatomy and Experimental Morphology, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Johannes B van Goudoever
- Department of Pediatrics, Emma Children's Hospital, Amsterdam University Medical Center, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, 1105 AZ, The Netherlands
| | - Teunis B H Geijtenbeek
- Department of Experimental Immunology; Amsterdam Infection & Immunity Institute, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, 1105 AZ, The Netherlands
| | - Marcus Altfeld
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany
| | - Steven T Pals
- Department of Pathology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, 1105 AZ, The Netherlands
| | - Daniel Perez
- Department of General, Visceral and Thoracic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Paul L Klarenbeek
- Department of Rheumatology and Clinical Immunology and Department of Experimental Immunology, Amsterdam Infection & Immunity Institute, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, 1007 MB, The Netherlands
- Amsterdam Rheumatology & Immunology Center, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, 1105 AZ, The Netherlands
| | - Christian Tomuschat
- Department of Pediatric Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Guido Sauter
- Institute of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Ingo Königs
- Department of Pediatric Surgery, Altona Children's Hospital, Hamburg, 22763, Germany
| | - Udo Schumacher
- Institute of Anatomy and Experimental Morphology, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Manuel A Friese
- Institute of Neuroimmunology and Multiple Sclerosis, Center for Molecular Neurobiology Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, 20251, Germany
| | - Nathaniel Melling
- Department of General, Visceral and Thoracic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Konrad Reinshagen
- Department of Pediatric Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany
| | - Madeleine J Bunders
- Department of Virus Immunology, Leibniz Institute of Virology, Hamburg, 20251, Germany.
- III. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, 20246, Germany.
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5
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Bona A, Seifert M, Thünauer R, Zodel K, Frew IJ, Römer W, Walz G, Yakulov TA. MARVEL domain containing CMTM4 affects CXCR4 trafficking. Mol Biol Cell 2022; 33:ar116. [PMID: 36044337 PMCID: PMC9634968 DOI: 10.1091/mbc.e22-05-0152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The MARVEL proteins CMTM4 and CMTM6 control PD-L1, thereby influencing tumor immunity. We found that defective zebrafish cmtm4 slowed the development of the posterior lateral line (pLL) by altering the Cxcr4b gradient across the pLL primordium (pLLP). Analysis in mammalian cells uncovered that CMTM4 interacted with CXCR4, altering its glycosylation pattern, but did not affect internalization or degradation of CXCR4 in the absence of its ligand CXCL12. Synchronized release of CXCR4 from the endoplasmic reticulum revealed that CMTM4 slowed CXCR4 trafficking from the endoplasmic reticulum to the plasma membrane without affecting overall cell surface expression. Altered CXCR4 trafficking reduced ligand-induced CXCR4 degradation and affected AKT but not ERK1/2 activation. CMTM4 expression, in contrast to that of CXCR4, correlated with the survival of patients with renal cell cancer in the TCGA cohort. Furthermore, we observed that cmtm4 depletion promotes the separation of cells from the pLLP cell cluster in zebrafish embryos. Collectively, our findings indicate that CMTM4 exerts general roles in the biosynthetic pathway of cell surface molecules and seems to affect CXCR4-dependent cell migration.
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Affiliation(s)
- Alexandra Bona
- Renal Division and,Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104 Freiburg, Germany,*Address correspondence to: Alexandra Bona (); Toma A. Yakulov ()
| | | | - Roland Thünauer
- Technology Platform Light Microscopy and Image Analysis (TP MIA), Leibniz Institute for Experimental Virology (HPI), 20251 Hamburg, Germany,Advanced Light and Fluorescence Microscopy (ALFM) Facility, Centre for Structural Systems Biology (CSSB), 22607 Hamburg, Germany
| | - Kyra Zodel
- Department of Medicine I, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Ian J. Frew
- Department of Medicine I, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany,German Cancer Consortium (DKTK), Partner Site Freiburg, and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany,Signalling Research Centres BIOSS and CIBSS
| | - Winfried Römer
- Signalling Research Centres BIOSS and CIBSS,Freiburg Institute for Advanced Studies (FRIAS), and,Faculty of Biology, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Gerd Walz
- Renal Division and,Signalling Research Centres BIOSS and CIBSS
| | - Toma A. Yakulov
- Renal Division and,*Address correspondence to: Alexandra Bona (); Toma A. Yakulov ()
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6
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Kampf LL, Schneider R, Gerstner L, Thünauer R, Chen M, Helmstädter M, Amar A, Onuchic-Whitford AC, Loza Munarriz R, Berdeli A, Müller D, Schrezenmeier E, Budde K, Mane S, Laricchia KM, Rehm HL, MacArthur DG, Lifton RP, Walz G, Römer W, Bergmann C, Hildebrandt F, Hermle T. TBC1D8B Mutations Implicate RAB11-Dependent Vesicular Trafficking in the Pathogenesis of Nephrotic Syndrome. J Am Soc Nephrol 2019; 30:2338-2353. [PMID: 31732614 DOI: 10.1681/asn.2019040414] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [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: 04/24/2019] [Accepted: 08/07/2019] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Mutations in about 50 genes have been identified as monogenic causes of nephrotic syndrome, a frequent cause of CKD. These genes delineated the pathogenetic pathways and rendered significant insight into podocyte biology. METHODS We used whole-exome sequencing to identify novel monogenic causes of steroid-resistant nephrotic syndrome (SRNS). We analyzed the functional significance of an SRNS-associated gene in vitro and in podocyte-like Drosophila nephrocytes. RESULTS We identified hemizygous missense mutations in the gene TBC1D8B in five families with nephrotic syndrome. Coimmunoprecipitation assays indicated interactions between TBC1D8B and active forms of RAB11. Silencing TBC1D8B in HEK293T cells increased basal autophagy and exocytosis, two cellular functions that are independently regulated by RAB11. This suggests that TBC1D8B plays a regulatory role by inhibiting endogenous RAB11. Coimmunoprecipitation assays showed TBC1D8B also interacts with the slit diaphragm protein nephrin, and colocalizes with it in immortalized cell lines. Overexpressed murine Tbc1d8b with patient-derived mutations had lower affinity for endogenous RAB11 and nephrin compared with wild-type Tbc1d8b protein. Knockdown of Tbc1d8b in Drosophila impaired function of the podocyte-like nephrocytes, and caused mistrafficking of Sns, the Drosophila ortholog of nephrin. Expression of Rab11 RNAi in nephrocytes entailed defective delivery of slit diaphragm protein to the membrane, whereas RAB11 overexpression revealed a partial phenotypic overlap to Tbc1d8b loss of function. CONCLUSIONS Novel mutations in TBC1D8B are monogenic causes of SRNS. This gene inhibits RAB11. Our findings suggest that RAB11-dependent vesicular nephrin trafficking plays a role in the pathogenesis of nephrotic syndrome.
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Affiliation(s)
- Lina L Kampf
- Renal Division, Department of Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Ronen Schneider
- Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Lea Gerstner
- Renal Division, Department of Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Roland Thünauer
- Signalling Research Centres BIOSS and CIBSS and Faculty of Biology, University of Freiburg, Freiburg, Germany.,Advanced Light and Fluorescence Microscopy Facility, Centre for Structural Systems Biology (CSSB) and University of Hamburg, Hamburg, Germany
| | - Mengmeng Chen
- Renal Division, Department of Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Martin Helmstädter
- Renal Division, Department of Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Ali Amar
- Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Ana C Onuchic-Whitford
- Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts.,Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | | | - Afig Berdeli
- Department of Pediatrics, Molecular Medicine Laboratory, Ege University, Izmir, Turkey
| | - Dominik Müller
- Department of Pediatric Nephrology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Eva Schrezenmeier
- Department of Nephrology and Medical Intensive Care, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Klemens Budde
- Department of Nephrology and Medical Intensive Care, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Shrikant Mane
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut
| | - Kristen M Laricchia
- Broad Center for Mendelian Genomics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge
| | - Heidi L Rehm
- Broad Center for Mendelian Genomics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge
| | - Daniel G MacArthur
- Broad Center for Mendelian Genomics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge
| | - Richard P Lifton
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut.,Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, New York
| | - Gerd Walz
- Renal Division, Department of Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Winfried Römer
- Signalling Research Centres BIOSS and CIBSS and Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Carsten Bergmann
- Center for Human Genetics, Mainz, Germany.,Center for Human Genetics, Bioscientia, Ingelheim, Germany; and.,Department of Medicine, University Hospital Freiburg, Freiburg, Germany
| | - Friedhelm Hildebrandt
- Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts;
| | - Tobias Hermle
- Renal Division, Department of Medicine, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany;
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Landi A, Mari M, Kleiser S, Wolf T, Gretzmeier C, Wilhelm I, Kiritsi D, Thünauer R, Geiger R, Nyström A, Reggiori F, Claudinon J, Römer W. Pseudomonas aeruginosa lectin LecB impairs keratinocyte fitness by abrogating growth factor signalling. Life Sci Alliance 2019; 2:2/6/e201900422. [PMID: 31732693 PMCID: PMC6858607 DOI: 10.26508/lsa.201900422] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 10/15/2019] [Accepted: 10/16/2019] [Indexed: 12/22/2022] Open
Abstract
Lectins are glycan-binding proteins with no catalytic activity and ubiquitously expressed in nature. Numerous bacteria use lectins to efficiently bind to epithelia, thus facilitating tissue colonisation. Wounded skin is one of the preferred niches for Pseudomonas aeruginosa, which has developed diverse strategies to impair tissue repair processes and promote infection. Here, we analyse the effect of the P. aeruginosa fucose-binding lectin LecB on human keratinocytes and demonstrate that it triggers events in the host, upon binding to fucosylated residues on cell membrane receptors, which extend beyond its role as an adhesion molecule. We found that LecB associates with insulin-like growth factor-1 receptor and dampens its signalling, leading to the arrest of cell cycle. In addition, we describe a novel LecB-triggered mechanism to down-regulate host cell receptors by showing that LecB leads to insulin-like growth factor-1 receptor internalisation and subsequent missorting towards intracellular endosomal compartments, without receptor activation. Overall, these data highlight that LecB is a multitask virulence factor that, through subversion of several host pathways, has a profound impact on keratinocyte proliferation and survival.
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Affiliation(s)
- Alessia Landi
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Muriel Mari
- Department of Biomedical Sciences of Cells & Systems, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands
| | - Svenja Kleiser
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Tobias Wolf
- Institute for Research in Biomedicine, Università della Svizzera Italiana, Bellinzona, Switzerland
| | - Christine Gretzmeier
- Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Isabel Wilhelm
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, Germany
| | - Dimitra Kiritsi
- Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Roland Thünauer
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Roger Geiger
- Institute for Research in Biomedicine, Università della Svizzera Italiana, Bellinzona, Switzerland
| | - Alexander Nyström
- Department of Dermatology, Medical Center-University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Fulvio Reggiori
- Department of Biomedical Sciences of Cells & Systems, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands
| | - Julie Claudinon
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Winfried Römer
- Faculty of Biology, Albert-Ludwigs-University Freiburg, Freiburg, Germany .,Signalling Research Centres, Centre for Biological Signalling Studies and Centre for Integrative Biological Signalling Studies , Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, Germany
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Mayr R, Haider M, Thünauer R, Haselgrübler T, Schütz GJ, Sonnleitner A, Hesse J. A microfluidic platform for transcription- and amplification-free detection of zepto-mole amounts of nucleic acid molecules. Biosens Bioelectron 2016; 78:1-6. [DOI: 10.1016/j.bios.2015.11.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 11/04/2015] [Accepted: 11/05/2015] [Indexed: 11/15/2022]
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