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Singh A, Thale S, Leibner T, Lamparter L, Ricker A, Nüsse H, Klingauf J, Galic M, Ohlberger M, Matis M. Dynamic interplay of microtubule and actomyosin forces drive tissue extension. Nat Commun 2024; 15:3198. [PMID: 38609383 PMCID: PMC11014958 DOI: 10.1038/s41467-024-47596-8] [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: 08/25/2023] [Accepted: 04/04/2024] [Indexed: 04/14/2024] Open
Abstract
In order to shape a tissue, individual cell-based mechanical forces have to be integrated into a global force pattern. Over the last decades, the importance of actomyosin contractile arrays, which are the key constituents of various morphogenetic processes, has been established for many tissues. Recent studies have demonstrated that the microtubule cytoskeleton mediates folding and elongation of the epithelial sheet during Drosophila morphogenesis, placing microtubule mechanics on par with actin-based processes. While these studies establish the importance of both cytoskeletal systems during cell and tissue rearrangements, a mechanistic understanding of their functional hierarchy is currently missing. Here, we dissect the individual roles of these two key generators of mechanical forces during epithelium elongation in the developing Drosophila wing. We show that wing extension, which entails columnar-to-cuboidal cell shape remodeling in a cell-autonomous manner, is driven by anisotropic cell expansion caused by the remodeling of the microtubule cytoskeleton from apico-basal to planarly polarized. Importantly, cell and tissue elongation is not associated with Myosin activity. Instead, Myosin II exhibits a homeostatic role, as actomyosin contraction balances polarized microtubule-based forces to determine the final cell shape. Using a reductionist model, we confirm that pairing microtubule and actomyosin-based forces is sufficient to recapitulate cell elongation and the final cell shape. These results support a hierarchical mechanism whereby microtubule-based forces in some epithelial systems prime actomyosin-generated forces.
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Affiliation(s)
- Amrita Singh
- Institute of Cell Biology, Medical Faculty, University of Münster, Münster, Germany
- Cells in Motion' Interfaculty Centre, University of Münster, Münster, Germany
| | - Sameedha Thale
- Institute of Cell Biology, Medical Faculty, University of Münster, Münster, Germany
- Cells in Motion' Interfaculty Centre, University of Münster, Münster, Germany
| | - Tobias Leibner
- Applied Mathematics, Institute for Analysis and Numerics, Faculty of Mathematics and Computer science, University of Münster, Münster, Germany
| | - Lucas Lamparter
- Cells in Motion' Interfaculty Centre, University of Münster, Münster, Germany
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Münster, Münster, Germany
| | - Andrea Ricker
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Münster, Münster, Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Münster, Münster, Germany
| | - Jürgen Klingauf
- Cells in Motion' Interfaculty Centre, University of Münster, Münster, Germany
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Münster, Münster, Germany
| | - Milos Galic
- Cells in Motion' Interfaculty Centre, University of Münster, Münster, Germany
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Münster, Münster, Germany
| | - Mario Ohlberger
- Applied Mathematics, Institute for Analysis and Numerics, Faculty of Mathematics and Computer science, University of Münster, Münster, Germany
| | - Maja Matis
- Institute of Cell Biology, Medical Faculty, University of Münster, Münster, Germany.
- Cells in Motion' Interfaculty Centre, University of Münster, Münster, Germany.
- Institute of Medical Physics and Biophysics, Medical Faculty, University of Münster, Münster, Germany.
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2
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Kaspar C, Ivanenko A, Lehrich J, Klingauf J, Pernice WHP. Biohybrid Photonic Platform for Subcellular Stimulation and Readout of In Vitro Neurons. Adv Sci (Weinh) 2024; 11:e2304561. [PMID: 38164885 DOI: 10.1002/advs.202304561] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 12/20/2023] [Indexed: 01/03/2024]
Abstract
Targeted manipulation of neural activity via light has become an indispensable tool for gaining insights into the intricate processes governing single neurons and complex neural networks. To shed light onto the underlying interaction mechanisms, it is crucial to achieve precise control of individual neural activity, as well as a spatial read-out resolution on the nanoscale. Here, a versatile photonic platform with subcellular resolution for stimulation and monitoring of in-vitro neurons is demonstrated. Low-loss photonic waveguides are fabricated on glass substrates using nanoimprint lithography and featuring a loss of only -0.9 ± 0.2 dB cm-1 at 489 nm and are combined with optical fiber-based waveguide-access and backside total internal reflection fluorescence microscopy. Neurons are grown on the bio-functionalized photonic chip surface and, expressing the light-sensitive ion channel Channelrhodopsin-2, are stimulated within the evanescent field penetration depth of 57 nm of the biocompatible waveguides. The versatility and cost-efficiency of the platform, along with the possible subcellular resolution, enable tailor-made investigations of neural interaction dynamics with defined spatial control and high throughput.
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Affiliation(s)
- Corinna Kaspar
- Institute of Physics, University of Muenster, Heisenbergstr. 11, 48149, Muenster, Germany
- Center for Soft Nanoscience, University of Muenster, Busso-Peuss-Str. 10, 48149, Muenster, Germany
| | - Alexander Ivanenko
- Center for Soft Nanoscience, University of Muenster, Busso-Peuss-Str. 10, 48149, Muenster, Germany
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149, Muenster, Germany
| | - Julia Lehrich
- Center for Soft Nanoscience, University of Muenster, Busso-Peuss-Str. 10, 48149, Muenster, Germany
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149, Muenster, Germany
| | - Jürgen Klingauf
- Center for Soft Nanoscience, University of Muenster, Busso-Peuss-Str. 10, 48149, Muenster, Germany
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149, Muenster, Germany
| | - Wolfram H P Pernice
- Institute of Physics, University of Muenster, Heisenbergstr. 11, 48149, Muenster, Germany
- Center for Soft Nanoscience, University of Muenster, Busso-Peuss-Str. 10, 48149, Muenster, Germany
- Kirchhoff-Institut for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120, Heidelberg, Germany
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3
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Frank D, Patnana PK, Vorwerk J, Mao L, Gopal LM, Jung N, Hennig T, Ruhnke L, Frenz JM, Kuppusamy M, Autry R, Wei L, Sun K, Mohammed Ahmed HM, Künstner A, Busch H, Müller H, Hutter S, Hoermann G, Liu L, Xie X, Al-Matary Y, Nimmagadda SC, Cano FC, Heuser M, Thol F, Göhring G, Steinemann D, Thomale J, Leitner T, Fischer A, Rad R, Röllig C, Altmann H, Kunadt D, Berdel WE, Hüve J, Neumann F, Klingauf J, Calderon V, Opalka B, Dührsen U, Rosenbauer F, Dugas M, Varghese J, Reinhardt HC, von Bubnoff N, Möröy T, Lenz G, Batcha AMN, Giorgi M, Selvam M, Wang E, McWeeney SK, Tyner JW, Stölzel F, Mann M, Jayavelu AK, Khandanpour C. Germ line variant GFI1-36N affects DNA repair and sensitizes AML cells to DNA damage and repair therapy. Blood 2023; 142:2175-2191. [PMID: 37756525 PMCID: PMC10733838 DOI: 10.1182/blood.2022015752] [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: 02/07/2022] [Revised: 07/06/2023] [Accepted: 07/24/2023] [Indexed: 09/29/2023] Open
Abstract
ABSTRACT Growth factor independence 1 (GFI1) is a DNA-binding transcription factor and a key regulator of hematopoiesis. GFI1-36N is a germ line variant, causing a change of serine (S) to asparagine (N) at position 36. We previously reported that the GFI1-36N allele has a prevalence of 10% to 15% among patients with acute myeloid leukemia (AML) and 5% to 7% among healthy Caucasians and promotes the development of this disease. Using a multiomics approach, we show here that GFI1-36N expression is associated with increased frequencies of chromosomal aberrations, mutational burden, and mutational signatures in both murine and human AML and impedes homologous recombination (HR)-directed DNA repair in leukemic cells. GFI1-36N exhibits impaired binding to N-Myc downstream-regulated gene 1 (Ndrg1) regulatory elements, causing decreased NDRG1 levels, which leads to a reduction of O6-methylguanine-DNA-methyltransferase (MGMT) expression levels, as illustrated by both transcriptome and proteome analyses. Targeting MGMT via temozolomide, a DNA alkylating drug, and HR via olaparib, a poly-ADP ribose polymerase 1 inhibitor, caused synthetic lethality in human and murine AML samples expressing GFI1-36N, whereas the effects were insignificant in nonmalignant GFI1-36S or GFI1-36N cells. In addition, mice that received transplantation with GFI1-36N leukemic cells treated with a combination of temozolomide and olaparib had significantly longer AML-free survival than mice that received transplantation with GFI1-36S leukemic cells. This suggests that reduced MGMT expression leaves GFI1-36N leukemic cells particularly vulnerable to DNA damage initiating chemotherapeutics. Our data provide critical insights into novel options to treat patients with AML carrying the GFI1-36N variant.
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Affiliation(s)
- Daria Frank
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
| | - Pradeep Kumar Patnana
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
- Department of Hematology and Oncology, University Hospital of Schleswig-Holstein, University Cancer Center Schleswig-Holstein, University of Lübeck, Lübeck, Germany
| | - Jan Vorwerk
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
| | - Lianghao Mao
- Proteomics and Cancer Cell Signaling Group, Clinical Cooperation Unit Pediatric Leukemia, German Cancer Research Center and Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Lavanya Mokada Gopal
- Proteomics and Cancer Cell Signaling Group, Clinical Cooperation Unit Pediatric Leukemia, German Cancer Research Center and Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Noelle Jung
- Proteomics and Cancer Cell Signaling Group, Clinical Cooperation Unit Pediatric Leukemia, German Cancer Research Center and Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Thorben Hennig
- Proteomics and Cancer Cell Signaling Group, Clinical Cooperation Unit Pediatric Leukemia, German Cancer Research Center and Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Leo Ruhnke
- Department of Internal Medicine I, University Hospital Dresden, Technical University Dresden, Dresden, Germany
| | - Joris Maximillian Frenz
- Proteomics and Cancer Cell Signaling Group, Clinical Cooperation Unit Pediatric Leukemia, German Cancer Research Center and Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Maithreyan Kuppusamy
- Proteomics and Cancer Cell Signaling Group, Clinical Cooperation Unit Pediatric Leukemia, German Cancer Research Center and Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Robert Autry
- Hopp Children’s Cancer Center, Heidelberg, Germany
| | - Lanying Wei
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Institute of Medical Informatics, University of Münster, Münster, Germany
| | - Kaiyan Sun
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
| | - Helal Mohammed Mohammed Ahmed
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Department of Hematology and Oncology, University Hospital of Schleswig-Holstein, University Cancer Center Schleswig-Holstein, University of Lübeck, Lübeck, Germany
| | - Axel Künstner
- Medical Systems Biology Group, Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany
- Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
| | - Hauke Busch
- Medical Systems Biology Group, Lübeck Institute of Experimental Dermatology, University of Lübeck, Lübeck, Germany
- Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
| | | | | | | | - Longlong Liu
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Department of Hematology, First Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
| | - Xiaoqing Xie
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Department of Hematology-Oncology, Chongqing University Cancer Hospital, Chongqing, China
| | - Yahya Al-Matary
- Department of Dermatology, University Hospital Essen, Essen, Germany
| | - Subbaiah Chary Nimmagadda
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Department of Hematology and Oncology, University Hospital of Schleswig-Holstein, University Cancer Center Schleswig-Holstein, University of Lübeck, Lübeck, Germany
| | - Fiorella Charles Cano
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Michael Heuser
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Felicitas Thol
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Gudrun Göhring
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Doris Steinemann
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Jürgen Thomale
- Institute of Cell Biology, University Hospital Essen, Essen, Germany
| | - Theo Leitner
- Department of Hematology and Oncology, University Hospital of Schleswig-Holstein, University Cancer Center Schleswig-Holstein, University of Lübeck, Lübeck, Germany
| | - Anja Fischer
- Institute of Molecular Oncology and Functional Genomics, School of Medicine, Technische Universität München, Munich, Germany
- Center for Translational Cancer Research, School of Medicine, Technische Universität München, Munich, Germany
| | - Roland Rad
- Institute of Molecular Oncology and Functional Genomics, School of Medicine, Technische Universität München, Munich, Germany
- Center for Translational Cancer Research, School of Medicine, Technische Universität München, Munich, Germany
- Department of Medicine II, Klinikum Rechts der Isar, School of Medicine, Technische Universität München, Munich, Germany
| | | | | | | | - Wolfgang E. Berdel
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
| | - Jana Hüve
- Fluorescence Microscopy Facility Münster, Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Felix Neumann
- Fluorescence Microscopy Facility Münster, Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
- Refined Laser Systems GmbH, Münster, Germany
| | - Jürgen Klingauf
- Fluorescence Microscopy Facility Münster, Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Virginie Calderon
- Bioinformatic Core Facility, Institut de Recherches Cliniques de Montréal, Montréal, QC, Canada
| | - Bertram Opalka
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
| | - Ulrich Dührsen
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
| | - Frank Rosenbauer
- Institute of Molecular Tumor Biology, Faculty of Medicine, University of Münster, Münster, Germany
| | - Martin Dugas
- Institute of Medical Informatics, University Hospital Heidelberg, Heidelberg, Germany
| | - Julian Varghese
- Institute of Medical Informatics, University of Münster, Münster, Germany
| | - Hans Christian Reinhardt
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
| | - Nikolas von Bubnoff
- Department of Hematology and Oncology, University Hospital of Schleswig-Holstein, University Cancer Center Schleswig-Holstein, University of Lübeck, Lübeck, Germany
| | - Tarik Möröy
- Institut de Recherches Cliniques de Montréal, Montreal, QC, Canada
- Division of Experimental Medicine, McGill University, Montreal, QC, Canada
- Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, Montreal, QC, Canada
| | - Georg Lenz
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
| | - Aarif M. N. Batcha
- Institute of Medical Data Processing, Biometrics and Epidemiology, Faculty of Medicine, Ludwig Maximilians University Munich, Munich, Germany
- Data Integration for Future Medicine, Ludwig Maximilian University Munich, Munich, Germany
| | - Marianna Giorgi
- Roswell Park Comprehensive Cancer Center, Jacobs School of Medicine and Biomedical Sciences, Buffalo, NY
| | - Murugan Selvam
- Roswell Park Comprehensive Cancer Center, Jacobs School of Medicine and Biomedical Sciences, Buffalo, NY
| | - Eunice Wang
- Roswell Park Comprehensive Cancer Center, Jacobs School of Medicine and Biomedical Sciences, Buffalo, NY
| | - Shannon K. McWeeney
- Division of Bioinformatics and Computational Biology, Department of Medical Informatics and Clinical Epidemiology, Oregon Health & Science University, Portland, OR
- Knight Cancer Institute, Oregon Health & Science University, Portland, OR
- Oregon Clinical and Translational Research Institute, Oregon Health & Science University, Portland, OR
| | - Jeffrey W. Tyner
- Knight Cancer Institute, Oregon Health & Science University, Portland, OR
- Department of Cell, Developmental and Cancer Biology, Oregon Health & Science University, Portland, OR
| | - Friedrich Stölzel
- Department of Internal Medicine I, University Hospital Dresden, Technical University Dresden, Dresden, Germany
- Department of Medicine II, Division for Stem Cell Transplantation and Cellular Immunotherapy, University Cancer Center Schleswig-Holstein, University Hospital Schleswig-Holstein Kiel, Christian Albrecht University Kiel, Kiel, Germany
| | - Matthias Mann
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Munich, Germany
| | - Ashok Kumar Jayavelu
- Proteomics and Cancer Cell Signaling Group, Clinical Cooperation Unit Pediatric Leukemia, German Cancer Research Center and Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
- Hopp Children’s Cancer Center, Heidelberg, Germany
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Munich, Germany
- Molecular Medicine Partnership Unit, European Molecular Biology Laboratory and Medical Faculty, University of Heidelberg, Heidelberg, Germany
| | - Cyrus Khandanpour
- Department of Medicine A, Hematology, Oncology and Pneumology, University Hospital Münster, Münster, Germany
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
- Department of Hematology and Oncology, University Hospital of Schleswig-Holstein, University Cancer Center Schleswig-Holstein, University of Lübeck, Lübeck, Germany
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4
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Haase D, Rasch C, Keller U, Tsytsyura Y, Glyvuk N, Elting A, Wittmar J, Janning A, Kahms M, Wedlich N, Schuberth C, Heuer A, Klingauf J, Wedlich-Söldner R. Tetraspanner-based nanodomains modulate BAR domain-induced membrane curvature. EMBO Rep 2023; 24:e57232. [PMID: 37902009 DOI: 10.15252/embr.202357232] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 10/02/2023] [Accepted: 10/11/2023] [Indexed: 10/31/2023] Open
Abstract
The topography of biological membranes is critical for formation of protein and lipid microdomains. One prominent example in the yeast plasma membrane (PM) are BAR domain-induced PM furrows. Here we report a novel function for the Sur7 family of tetraspanner proteins in the regulation of local PM topography. Combining TIRF imaging, STED nanoscopy, freeze-fracture EM and membrane simulations we find that Sur7 tetraspanners form multimeric strands at the edges of PM furrows, where they modulate forces exerted by BAR domain proteins at the furrow base. Loss of Sur7 tetraspanners or Sur7 displacement due to altered PIP2 homeostasis leads to increased PM invagination and a distinct form of membrane tubulation. Physiological defects associated with PM tubulation are rescued by synthetic anchoring of Sur7 to furrows. Our findings suggest a key role for tetraspanner proteins in sculpting local membrane domains. The maintenance of stable PM furrows depends on a balance between negative curvature at the base which is generated by BAR domains and positive curvature at the furrows' edges which is stabilized by strands of Sur7 tetraspanners.
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Affiliation(s)
- Daniel Haase
- Institute of Cell Dynamics and Imaging, and Cells-in-Motion Interfaculty Center (CiMIC), University of Münster, Münster, Germany
| | - Christiane Rasch
- Institute for Medical Physics and Biophysics, and Cells-in-Motion Interfaculty Center (CiMIC), Münster, Germany
- Center for Soft Nanoscience, Münster, Germany
| | - Ulrike Keller
- Institute for Medical Physics and Biophysics, and Cells-in-Motion Interfaculty Center (CiMIC), Münster, Germany
- Center for Soft Nanoscience, Münster, Germany
| | - Yaroslav Tsytsyura
- Institute for Medical Physics and Biophysics, and Cells-in-Motion Interfaculty Center (CiMIC), Münster, Germany
| | - Nataliya Glyvuk
- Institute for Medical Physics and Biophysics, and Cells-in-Motion Interfaculty Center (CiMIC), Münster, Germany
| | - Annegret Elting
- Institute of Cell Dynamics and Imaging, and Cells-in-Motion Interfaculty Center (CiMIC), University of Münster, Münster, Germany
| | - Julia Wittmar
- Institute of Cell Dynamics and Imaging, and Cells-in-Motion Interfaculty Center (CiMIC), University of Münster, Münster, Germany
| | - Annette Janning
- Institute of Cell Dynamics and Imaging, and Cells-in-Motion Interfaculty Center (CiMIC), University of Münster, Münster, Germany
| | - Martin Kahms
- Institute for Medical Physics and Biophysics, and Cells-in-Motion Interfaculty Center (CiMIC), Münster, Germany
| | - Noah Wedlich
- Institute of Cell Dynamics and Imaging, and Cells-in-Motion Interfaculty Center (CiMIC), University of Münster, Münster, Germany
- Institute for Physical Chemistry, Münster, Germany
| | - Christian Schuberth
- Institute of Cell Dynamics and Imaging, and Cells-in-Motion Interfaculty Center (CiMIC), University of Münster, Münster, Germany
| | | | - Jürgen Klingauf
- Institute for Medical Physics and Biophysics, and Cells-in-Motion Interfaculty Center (CiMIC), Münster, Germany
- Center for Soft Nanoscience, Münster, Germany
| | - Roland Wedlich-Söldner
- Institute of Cell Dynamics and Imaging, and Cells-in-Motion Interfaculty Center (CiMIC), University of Münster, Münster, Germany
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5
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Luik AL, Hannocks MJ, Loismann S, Kapupara K, Cerina M, van der Stoel M, Tsytsyura Y, Glyvuk N, Nordenvall C, Klingauf J, Huveneers S, Meuth S, Jakobsson L, Sorokin L. Endothelial basement membrane laminins - new players in mouse and human myoendothelial junctions and shear stress communication. Matrix Biol 2023; 121:56-73. [PMID: 37311512 DOI: 10.1016/j.matbio.2023.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/30/2023] [Accepted: 06/07/2023] [Indexed: 06/15/2023]
Abstract
Basement membranes (BMs) are critical but frequently ignored components of the vascular system. Using high-resolution confocal imaging of whole-mount-stained mesenteric arteries, we identify integrins, vinculin, focal adhesion kinase (FAK) and several BM proteins including laminins as novel components of myoendothelial junctions (MEJs), anatomical microdomains that are emerging as regulators of cross-talk between endothelium and smooth muscle cells (SMCs). Electron microscopy revealed multiple layers of the endothelial BM that surround endothelial projections into the smooth muscle layer as structural characteristics of MEJs. The shear-responsive calcium channel TRPV4 is broadly distributed in endothelial cells and occurs in a proportion of MEJs where it localizes to the tips of the endothelial projections that are in contact with the underlying SMCs. In mice lacking the major endothelial laminin isoform, laminin 411 (Lama4-/-), which we have previously shown over-dilate in response to shear and exhibit a compensatory laminin 511 upregulation, localization of TRPV4 at the endothelial-SMC interface in MEJs was increased. Endothelial laminins do not affect TRPV4 expression, rather in vitro electrophysiology studies using human umbilical cord arterial endothelial cells revealed enhanced TRPV4 signalling upon culturing on an RGD-motif containing domain of laminin 511. Hence, integrin-mediated interactions with laminin 511 in MEJ structures unique to resistance arteries modulate TRPV4 localization at the endothelial-smooth muscle interface in MEJs and signalling over this shear-response molecule.
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Affiliation(s)
- Anna-Liisa Luik
- Institute of Physiological Chemistry and Pathobiochemistry; Cells in Motion Interfaculty Centre
| | - Melanie-Jane Hannocks
- Institute of Physiological Chemistry and Pathobiochemistry; Cells in Motion Interfaculty Centre
| | - Sophie Loismann
- Institute of Physiological Chemistry and Pathobiochemistry; Cells in Motion Interfaculty Centre
| | - Kishan Kapupara
- Institute of Physiological Chemistry and Pathobiochemistry; Cells in Motion Interfaculty Centre
| | - Manuela Cerina
- Cells in Motion Interfaculty Centre; Institute of Translational Neurology and Department of Neurology, University of Muenster, Germany
| | - Miesje van der Stoel
- Dept of Medical Biochemistry, Amsterdam Cardiovascular Sciences, Amsterdam University Medical Centre, the Netherlands
| | - Yaroslav Tsytsyura
- Institute of Medical Physics and Biophysics, University of Münster, Germany
| | - Nataliya Glyvuk
- Institute of Medical Physics and Biophysics, University of Münster, Germany
| | - Caroline Nordenvall
- Dept of Molecular Medicine and Surgery, Karolinska Institute, Sweden; Dept of Pelvic Cancer, GI Oncology and Colorectal Surgery Unit, Karolinska University Hospital, Sweden
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Münster, Germany
| | - Stephan Huveneers
- Dept of Medical Biochemistry, Amsterdam Cardiovascular Sciences, Amsterdam University Medical Centre, the Netherlands
| | - Sven Meuth
- Cells in Motion Interfaculty Centre; Institute of Translational Neurology and Department of Neurology, University of Muenster, Germany; Neurology Clinic, Medical Faculty, University of Düsseldorf, Germany
| | - Lars Jakobsson
- Dept of Medical Biochemistry and Biophysics, Karolinska Institute, Sweden
| | - Lydia Sorokin
- Institute of Physiological Chemistry and Pathobiochemistry; Cells in Motion Interfaculty Centre.
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6
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Vöing K, Michgehl U, Mertens ND, Picciotto C, Maywald ML, Goretzko J, Waimann S, Gilhaus K, Rogg M, Schell C, Klingauf J, Tsytsyura Y, Hansen U, van Marck V, Edinger AL, Vollenbröker B, Rescher U, Braun DA, George B, Weide T, Pavenstädt H. Disruption of the Rab7-Dependent Final Common Pathway of Endosomal and Autophagic Processing Results in a Severe Podocytopathy. J Am Soc Nephrol 2023; 34:1191-1206. [PMID: 37022133 PMCID: PMC10356157 DOI: 10.1681/asn.0000000000000126] [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: 10/26/2022] [Accepted: 03/03/2023] [Indexed: 04/07/2023] Open
Abstract
SIGNIFICANCE STATEMENT Endocytosis, recycling, and degradation of proteins are essential functions of mammalian cells, especially for terminally differentiated cells with limited regeneration rates and complex morphology, such as podocytes. To improve our understanding on how disturbances of these trafficking pathways are linked to podocyte depletion and slit diaphragm (SD) injury, the authors explored the role of the small GTPase Rab7, which is linked to endosomal, lysosomal, and autophagic pathways, using as model systems mice and Drosophila with podocyte-specific or nephrocyte-specific loss of Rab7, and a human podocyte cell line depleted for Rab7. Their findings point to maturation and fusion events during endolysosomal and autophagic maturation as key processes for podocyte homeostasis and function and identify altered lysosomal pH values as a putative novel mechanism for podocytopathies. BACKGROUND Endocytosis, recycling, and degradation of proteins are essential functions of mammalian cells, especially for terminally differentiated cells with limited regeneration rates, such as podocytes. How disturbances within these trafficking pathways may act as factors in proteinuric glomerular diseases is poorly understood. METHODS To explore how disturbances in trafficking pathways may act as factors in proteinuric glomerular diseases, we focused on Rab7, a highly conserved GTPase that controls the homeostasis of late endolysosomal and autophagic processes. We generated mouse and Drosophila in vivo models lacking Rab7 exclusively in podocytes or nephrocytes, and performed histologic and ultrastructural analyses. To further investigate Rab7 function on lysosomal and autophagic structures, we used immortalized human cell lines depleted for Rab7. RESULTS Depletion of Rab7 in mice, Drosophila , and immortalized human cell lines resulted in an accumulation of diverse vesicular structures resembling multivesicular bodies, autophagosomes, and autoendolysosomes. Mice lacking Rab7 developed a severe and lethal renal phenotype with early-onset proteinuria and global or focal segmental glomerulosclerosis, accompanied by an altered distribution of slit diaphragm proteins. Remarkably, structures resembling multivesicular bodies began forming within 2 weeks after birth, prior to the glomerular injuries. In Drosophila nephrocytes, Rab7 knockdown resulted in the accumulation of vesicles and reduced slit diaphragms. In vitro , Rab7 knockout led to similar enlarged vesicles and altered lysosomal pH values, accompanied by an accumulation of lysosomal marker proteins. CONCLUSIONS Disruption within the final common pathway of endocytic and autophagic processes may be a novel and insufficiently understood mechanism regulating podocyte health and disease.
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Affiliation(s)
- Kristin Vöing
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Ulf Michgehl
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Nils David Mertens
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Cara Picciotto
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Mee-Ling Maywald
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Jonas Goretzko
- Research Group Regulatory Mechanisms of Inflammation, Institute of Medical Biochemistry, Centre for Molecular Biology of Inflammation, University of Muenster, Muenster, Germany
| | - Sofie Waimann
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Kevin Gilhaus
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Manuel Rogg
- Institute of Surgical Pathology, Faculty of Medicine, Medical Center-University of Freiburg, Freiburg, Germany
- Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, Freiburg, Germany
| | - Christoph Schell
- Institute of Surgical Pathology, Faculty of Medicine, Medical Center-University of Freiburg, Freiburg, Germany
- Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, Freiburg, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Muenster, Muenster, Germany
| | - Yaroslav Tsytsyura
- Institute of Medical Physics and Biophysics, University of Muenster, Muenster, Germany
| | - Uwe Hansen
- Institute for Musculoskeletal Medicine (IMM), University of Muenster, Muenster, Germany
| | - Veerle van Marck
- Department of Pathology, University Hospital Muenster Muenster, Germany
| | - Aimee L. Edinger
- Department of Developmental & Cell Biology, University of California, Irvine, California
| | - Beate Vollenbröker
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Ursula Rescher
- Research Group Regulatory Mechanisms of Inflammation, Institute of Medical Biochemistry, Centre for Molecular Biology of Inflammation, University of Muenster, Muenster, Germany
| | - Daniela Anne Braun
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Britta George
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Thomas Weide
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
| | - Hermann Pavenstädt
- Department of Internal Medicine and Nephrology, University Hospital of Münster, Medical Clinic D, Munster, Germany
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7
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Gilhaus K, Cepok C, Kamm D, Surmann B, Nedvetsky PI, Emich J, Sundukova A, Saatkamp K, Nüsse H, Klingauf J, Wennmann DO, George B, Krahn MP, Pavenstädt HJ, Vollenbröker BA. Activation of Hippo Pathway Damages Slit Diaphragm by Deprivation of Ajuba Proteins. J Am Soc Nephrol 2023; 34:1039-1055. [PMID: 36930055 PMCID: PMC10278832 DOI: 10.1681/asn.0000000000000107] [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: 07/22/2022] [Accepted: 02/06/2023] [Indexed: 03/18/2023] Open
Abstract
SIGNIFICANCE STATEMENT Nuclear exclusion of the cotranscription factor YAP, which is a consequence of activation of the Hippo signaling pathway, leads to FSGS and podocyte apoptosis. Ajuba proteins play an important role in the glomerular filtration barrier by keeping the Hippo pathway inactive. In nephrocytes from Drosophila melanogaster , a well-established model system for podocyte research, Ajuba proteins ensure slit diaphragm (SD) formation and function. Hippo pathway activation leads to mislocalization of Ajuba proteins, decreased SD formation, rearrangement of the actin cytoskeleton, and increased SD permeability. Targeting the kinases of the Hippo pathway with specific inhibitors in the glomerulus could, therefore, be a promising strategy for therapy of FSGS. BACKGROUND The highly conserved Hippo pathway, which regulates organ growth and cell proliferation by inhibiting transcriptional cofactors YAP/TAZ, plays a special role in podocytes, where activation of the pathway leads to apoptosis. The Ajuba family proteins (Ajuba, LIM domain-containing protein 1 (LIMD1) and Wilms tumor protein 1-interacting protein [WTIP]) can bind and inactivate large tumor suppressor kinases 1 and 2, (LATS1/2) two of the Hippo pathway key kinases. WTIP, furthermore, connects the slit diaphragm (SD), the specialized cell-cell junction between podocytes, with the actin cytoskeleton. METHODS We used garland cell nephrocytes of Drosophila melanogaster to monitor the role of Ajuba proteins in Hippo pathway regulation and structural integrity of the SD. Microscopy and functional assays analyzed the interplay between Ajuba proteins and LATS2 regarding expression, localization, interaction, and effects on the functionality of the SD. RESULTS In nephrocytes, the Ajuba homolog Djub recruited Warts (LATS2 homolog) to the SD. Knockdown of Djub activated the Hippo pathway. Reciprocally, Hippo activation reduced the Djub level. Both Djub knockdown and Hippo activation led to morphological changes in the SD, rearrangement of the cortical actin cytoskeleton, and increased SD permeability. Knockdown of Warts or overexpression of constitutively active Yki prevented these effects. In podocytes, Hippo pathway activation or knockdown of YAP also decreased the level of Ajuba proteins. CONCLUSIONS Ajuba proteins regulate the structure and function of the SD in nephrocytes, connecting the SD protein complex to the actin cytoskeleton and maintaining the Hippo pathway in an inactive state. Hippo pathway activation directly influencing Djub expression suggests a self-amplifying feedback mechanism.
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Affiliation(s)
- Kevin Gilhaus
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Claudia Cepok
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - David Kamm
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Beate Surmann
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Pavel I. Nedvetsky
- Medical Cell Biology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Jana Emich
- Institute of Reproductive Genetics, University Hospital of Münster, Münster, Germany
| | - Alina Sundukova
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Katharina Saatkamp
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, Westfälische-Wilhelms University Münster, Münster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, Westfälische-Wilhelms University Münster, Münster, Germany
| | - Dirk O. Wennmann
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Britta George
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | - Michael P. Krahn
- Medical Cell Biology, Medical Clinic D, University Hospital of Münster, Münster, Germany
| | | | - Beate A. Vollenbröker
- Molecular Nephrology, Medical Clinic D, University Hospital of Münster, Münster, Germany
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8
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Raj N, Greune L, Kahms M, Mildner K, Franzkoch R, Psathaki OE, Zobel T, Zeuschner D, Klingauf J, Gerke V. Early Endosomes Act as Local Exocytosis Hubs to Repair Endothelial Membrane Damage. Adv Sci (Weinh) 2023; 10:e2300244. [PMID: 36938863 PMCID: PMC10161044 DOI: 10.1002/advs.202300244] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/21/2023] [Indexed: 05/06/2023]
Abstract
The plasma membrane of a cell is subject to stresses causing ruptures that must be repaired immediately to preserve membrane integrity and ensure cell survival. Yet, the spatio-temporal membrane dynamics at the wound site and the source of the membrane required for wound repair are poorly understood. Here, it is shown that early endosomes, previously only known to function in the uptake of extracellular material and its endocytic transport, are involved in plasma membrane repair in human endothelial cells. Using live-cell imaging and correlative light and electron microscopy, it is demonstrated that membrane injury triggers a previously unknown exocytosis of early endosomes that is induced by Ca2+ entering through the wound. This exocytosis is restricted to the vicinity of the wound site and mediated by the endosomal soluble N-ethylmaleimide sensitive factor attachment protein receptor (SNARE) VAMP2, which is crucial for efficient membrane repair. Thus, the newly identified Ca2+ -evoked and localized exocytosis of early endosomes supplies the membrane material required for rapid resealing of a damaged plasma membrane, thereby providing the first line of defense against damage in mechanically challenged endothelial cells.
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Affiliation(s)
- Nikita Raj
- Institute of Medical Biochemistry, Centre for Molecular Biology of Inflammation (ZMBE), Cells in Motion Interfaculty Center, University of Münster, 48149, Münster, Germany
| | - Lilo Greune
- Institute of Infectiology, Center for Molecular Biology of Inflammation (ZMBE), University of Münster, 48149, Münster, Germany
| | - Martin Kahms
- Institute of Medical Physics and Biophysics, University of Münster, 48149, Münster, Germany
| | - Karina Mildner
- Electron Microscopy Facility, Max Planck Institute for Molecular Biomedicine, 48149, Münster, Germany
| | - Rico Franzkoch
- Department of Biology, integrated Bioimaging Facility (iBiOs), Center of Cellular Nanoanalytics (CellNanO), University of Osnabrück, 49076, Osnabrück, Germany
| | - Olympia Ekaterini Psathaki
- Department of Biology, integrated Bioimaging Facility (iBiOs), Center of Cellular Nanoanalytics (CellNanO), University of Osnabrück, 49076, Osnabrück, Germany
| | - Thomas Zobel
- Imaging Network, Cells in Motion Interfaculty Centre, University of Münster, 48149, Münster, Germany
| | - Dagmar Zeuschner
- Electron Microscopy Facility, Max Planck Institute for Molecular Biomedicine, 48149, Münster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Münster, 48149, Münster, Germany
| | - Volker Gerke
- Institute of Medical Biochemistry, Centre for Molecular Biology of Inflammation (ZMBE), Cells in Motion Interfaculty Center, University of Münster, 48149, Münster, Germany
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9
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Ebrahimkutty M, Duan J, Nüsse H, Klingauf J, Galic M. Negatively curved cellular membranes promote BAIAP2 signaling hub assembly. Nanoscale 2023; 15:6759-6769. [PMID: 36943331 DOI: 10.1039/d2nr05719k] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Plasma membrane deformations are associated with curvature-dependent protein enrichment that contributes to a wide array of cellular functions. While the spatio-temporal protein dynamics at membrane indentations is well characterized, relatively little is known about protein kinetics at outwardly deforming membrane sites. This is in part due to the lack of high throughput approaches to systematically probe the curvature-dependence of protein-membrane interactions. Here, we developed a nanopatterned array for multiplexed analysis of protein dynamics at negatively curved cellular membranes. Taking advantage of this robust and versatile platform, we explored how membrane shape influences the prototypic negative curvature sensing protein BAIAP2 and its effector proteins. We find assembly of multi-protein signaling hubs and increased actin polymerization at outwardly deformed membrane sections, indicative of curvature-dependent BAIAP2 activation. Collectively, this study presents technical and conceptual advancements towards a quantitative understanding of spatio-temporal protein dynamics at negatively curved membranes.
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Affiliation(s)
- Mirsana Ebrahimkutty
- Institute of Medical Physics and Biophysics, University of Muenster, Germany.
- 'Cells in Motion' Interfaculty Centre, University of Muenster, Germany
- CIM-IMPRS Graduate School, Muenster, Germany
| | - Junxiu Duan
- Institute of Medical Physics and Biophysics, University of Muenster, Germany.
- 'Cells in Motion' Interfaculty Centre, University of Muenster, Germany
- CIM-IMPRS Graduate School, Muenster, Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, University of Muenster, Germany.
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Muenster, Germany.
- 'Cells in Motion' Interfaculty Centre, University of Muenster, Germany
| | - Milos Galic
- Institute of Medical Physics and Biophysics, University of Muenster, Germany.
- 'Cells in Motion' Interfaculty Centre, University of Muenster, Germany
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10
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Abstract
In the CNS communication between neurons occurs at synapses by secretion of neurotransmitter via exocytosis of synaptic vesicles (SVs) at the active zone. Given the limited number of SVs in presynaptic boutons a fast and efficient recycling of exocytosed membrane and proteins by triggered compensatory endocytosis is required to maintain neurotransmission. Thus, pre-synapses feature a unique tight coupling of exo- and endocytosis in time and space resulting in the reformation of SVs with uniform morphology and well-defined molecular composition. This rapid response requires early stages of endocytosis at the peri-active zone to be well choreographed to ensure reformation of SVs with high fidelity. The pre-synapse can address this challenge by a specialized membrane microcompartment, where a pre-sorted and pre-assembled readily retrievable pool (RRetP) of endocytic membrane patches is formed, consisting of the vesicle cargo, presumably bound within a nucleated Clathrin and adaptor complex. This review considers evidence for the RRetP microcompartment to be the primary organizer of presynaptic triggered compensatory endocytosis.
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Affiliation(s)
- Sai Krishnan
- Institute of Medical Physics and Biophysics, University of Münster, Robert-Koch Strasse 31, D-48149, Münster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Münster, Robert-Koch Strasse 31, D-48149, Münster, Germany.,Center for Soft Nanoscience, Busso-Peus Strasse 10, D-48149, Münster, Germany
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11
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Krausel V, Pund L, Nüsse H, Bachir H, Ricker A, Klingauf J, Weide T, Pavenstädt H, Krahn MP, Braun DA. The transcription factor ATF4 mediates endoplasmic reticulum stress-related podocyte injury and slit diaphragm defects. Kidney Int 2022; 103:872-885. [PMID: 36587794 DOI: 10.1016/j.kint.2022.11.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 03/06/2022] [Revised: 10/25/2022] [Accepted: 11/17/2022] [Indexed: 12/30/2022]
Abstract
Mutations in OSGEP and four other genes that encode subunits of the KEOPS complex cause Galloway-Mowat syndrome, a severe, inherited kidney-neurological disease. The complex catalyzes an essential posttranscriptional modification of tRNA and its loss of function induces endoplasmic reticulum (ER) stress. Here, using Drosophila melanogaster garland nephrocytes and cultured human podocytes, we aimed to elucidate the molecular pathogenic mechanisms of KEOPS-related glomerular disease and to test pharmacological inhibition of ER stress-related signaling as a therapeutic principle. We found that ATF4, an ER stress-mediating transcription factor, or its fly orthologue Crc, were upregulated in both fly nephrocytes and human podocytes. Knockdown of Tcs3, a fly orthologue of OSGEP, caused slit diaphragm defects, recapitulating the human kidney phenotype. OSGEP cDNA with mutations found in patients lacked the capacity for rescue. Genetic interaction studies in Tcs3-deficient nephrocytes revealed that Crc mediates not only cell injury, but surprisingly also slit diaphragm defects, and that genetic or pharmacological inhibition of Crc activation attenuates both phenotypes. These findings are conserved in human podocytes where ATF4 inhibition improved the viability of podocytes with OSGEP knockdown, with chemically induced ER stress, and where ATF4 target genes and pro-apoptotic gene clusters are upregulated upon OSGEP knockdown. Thus, our data identify ATF4-mediated signaling as a molecular link among ER stress, slit diaphragm defects, and podocyte injury, and our data suggest that modulation of ATF4 signaling may be a potential therapeutic target for certain podocyte diseases.
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Affiliation(s)
- Vanessa Krausel
- Department D of Internal Medicine, University Hospital of Munster, Munster, Germany
| | - Lisanne Pund
- Department D of Internal Medicine, University Hospital of Munster, Munster, Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, University of Munster, Munster, Germany
| | - Hussein Bachir
- Department D of Internal Medicine, University Hospital of Munster, Munster, Germany
| | - Andrea Ricker
- Institute of Medical Physics and Biophysics, University of Munster, Munster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Munster, Munster, Germany
| | - Thomas Weide
- Department D of Internal Medicine, University Hospital of Munster, Munster, Germany
| | - Hermann Pavenstädt
- Department D of Internal Medicine, University Hospital of Munster, Munster, Germany
| | - Michael P Krahn
- Department D of Internal Medicine, University Hospital of Munster, Munster, Germany
| | - Daniela A Braun
- Department D of Internal Medicine, University Hospital of Munster, Munster, Germany.
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12
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Maywald ML, Picciotto C, Lepa C, Bertgen L, Yousaf FS, Ricker A, Klingauf J, Krahn MP, Pavenstädt H, George B. Rap1 Activity Is Essential for Focal Adhesion and Slit Diaphragm Integrity. Front Cell Dev Biol 2022; 10:790365. [PMID: 35372328 PMCID: PMC8972170 DOI: 10.3389/fcell.2022.790365] [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] [Received: 10/06/2021] [Accepted: 02/24/2022] [Indexed: 11/24/2022] Open
Abstract
Glomerular podocytes build, with their intercellular junctions, part of the kidney filter. The podocyte cell adhesion protein, nephrin, is essential for developing and maintaining slit diaphragms as functional loss in humans results in heavy proteinuria. Nephrin expression and function are also altered in many adult-onset glomerulopathies. Nephrin signals from the slit diaphragm to the actin cytoskeleton and integrin β1 at focal adhesions by recruiting Crk family proteins, which can interact with the Rap guanine nucleotide exchange factor 1 C3G. As Rap1 activity affects focal adhesion formation, we hypothesize that nephrin signals via Rap1 to integrin β. To address this issue, we combined Drosophila in vivo and mammalian cell culture experiments. We find that Rap1 is necessary for correct targeting of integrin β to focal adhesions in Drosophila nephrocytes, which also form slit diaphragm-like structures. In the fly, the Rap1 activity is important for signaling of the nephrin ortholog to integrin β, as well as for nephrin-dependent slit diaphragm integrity. We show by genetic interaction experiments that Rap1 functions downstream of nephrin signaling to integrin β and downstream of nephrin signaling necessary for slit diaphragm integrity. Similarly, in human podocyte culture, nephrin activation results in increased activation of Rap1. Thus, Rap1 is necessary for downstream signal transduction of nephrin to integrin β.
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Affiliation(s)
- Mee-Ling Maywald
- Medizinische Klinik D, University Hospital Münster, Münster, Germany
| | - Cara Picciotto
- Medizinische Klinik D, University Hospital Münster, Münster, Germany
| | - Carolin Lepa
- Medizinische Klinik D, University Hospital Münster, Münster, Germany
| | - Luisa Bertgen
- Medizinische Klinik D, University Hospital Münster, Münster, Germany
| | | | - Andrea Ricker
- Institute of Medical Physics and Biophysics, Westfälische Wilhelms-University Münster, Münster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, Westfälische Wilhelms-University Münster, Münster, Germany
| | - Michael P. Krahn
- Medizinische Klinik D, Medical Cell Biology, University Hospital Münster, Münster, Germany
| | | | - Britta George
- Medizinische Klinik D, University Hospital Münster, Münster, Germany
- *Correspondence: Britta George,
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13
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Renner H, Grabos M, Becker KJ, Kagermeier TE, Wu J, Otto M, Peischard S, Zeuschner D, TsyTsyura Y, Disse P, Klingauf J, Leidel SA, Seebohm G, Schöler HR, Bruder JM. A fully automated high-throughput workflow for 3D-based chemical screening in human midbrain organoids. eLife 2020; 9:52904. [PMID: 33138918 PMCID: PMC7609049 DOI: 10.7554/elife.52904] [Citation(s) in RCA: 94] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 09/26/2020] [Indexed: 12/13/2022] Open
Abstract
Three-dimensional (3D) culture systems have fueled hopes to bring about the next generation of more physiologically relevant high-throughput screens (HTS). However, current protocols yield either complex but highly heterogeneous aggregates (‘organoids’) or 3D structures with less physiological relevance (‘spheroids’). Here, we present a scalable, HTS-compatible workflow for the automated generation, maintenance, and optical analysis of human midbrain organoids in standard 96-well-plates. The resulting organoids possess a highly homogeneous morphology, size, global gene expression, cellular composition, and structure. They present significant features of the human midbrain and display spontaneous aggregate-wide synchronized neural activity. By automating the entire workflow from generation to analysis, we enhance the intra- and inter-batch reproducibility as demonstrated via RNA sequencing and quantitative whole mount high-content imaging. This allows assessing drug effects at the single-cell level within a complex 3D cell environment in a fully automated HTS workflow. In 1907, the American zoologist Ross Granville Harrison developed the first technique to artificially grow animal cells outside the body in a liquid medium. Cells are still grown in much the same way in modern laboratories: a single layer of cells is placed in a warm incubator with nutrient-rich broth. These cell layers are often used to test new drugs, but they cannot recapitulate the complexity of a real organ made from multiple cell types within a living, breathing human body. Growing three-dimensional miniature organs or 'organoids' that behave in a similar way to real organs is the next step towards creating better platforms for drug screening, but there are several difficulties inherent to this process. For one thing, it is hard to recreate the multitude of cell types that make up an organ. For another, the cells that do grow often fail to connect and communicate with each other in biologically realistic ways. It is also tough to grow a large number of organoids that all behave in the same way, making it hard to know whether a particular drug works or whether it is just being tested on a 'good' organoid. Renner et al. have been able to overcome these issues by using robotic technology to create thousands of identical, mid-brain organoids from human cells in the lab. The robots perform a series of precisely controlled tasks – including dispensing the initial cells into wells, feeding organoids as they grow and testing them at different stages of development. These mini-brains, which are the size of the head of a pin, mimic the part of the brain where Parkinson's disease first manifests. They can be used to test new drugs for Parkinson's, and to better understand the biology of the brain. Perhaps more importantly, other types of organoids can be created using the same technique to model diseases that affect other areas of the brain, or other organs altogether. For example, Renner et al. also generated forebrain organoids using an automated approach for both generation and analysis. This research, which shows that organoids can be grown and tested in a fully automated, reproducible and scalable way, creates a platform to quickly, cheaply and easily test thousands of drugs for Parkinson's and other difficult-to-treat diseases in a human setting. This approach has the potential to reduce research waste by increasing the chances that a drug that works in the lab will also ultimately work in a patient; and reduce animal experiments, as drugs that do not work in human tissues will not proceed to animal testing.
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Affiliation(s)
- Henrik Renner
- Department for Cell and Developmental Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany
| | - Martha Grabos
- Department for Cell and Developmental Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany
| | - Katharina J Becker
- Department for Cell and Developmental Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Theresa E Kagermeier
- Department for Cell and Developmental Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Jie Wu
- Max Planck Research Group for RNA Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany.,Research Group for RNA Biochemistry, Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Mandy Otto
- Department for Cell and Developmental Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Stefan Peischard
- Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases, University Hospital Münster, Münster, Germany
| | - Dagmar Zeuschner
- Electron Microscopy Unit, Max Planck Institute for molecular Biomedicine, Münster, Germany
| | - Yaroslav TsyTsyura
- Cellular Biophysics Group, Institute for Medical Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Paul Disse
- Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases, University Hospital Münster, Münster, Germany
| | - Jürgen Klingauf
- Cellular Biophysics Group, Institute for Medical Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Sebastian A Leidel
- Max Planck Research Group for RNA Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany.,Research Group for RNA Biochemistry, Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Guiscard Seebohm
- Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases, University Hospital Münster, Münster, Germany
| | - Hans R Schöler
- Department for Cell and Developmental Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Jan M Bruder
- Department for Cell and Developmental Biology, Max Planck Institute for molecular Biomedicine, Münster, Germany
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14
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Begemann I, Keller U, Nüsse H, Klingauf J, Galic M. Parallel Acquisition of Plasma Membrane Ultrastructure and Cytosolic Protein Localisation in Cultured Cells via Correlated Immunogold SEM. Cells 2020; 9:cells9061329. [PMID: 32466457 PMCID: PMC7349049 DOI: 10.3390/cells9061329] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/06/2020] [Accepted: 05/14/2020] [Indexed: 11/16/2022] Open
Abstract
Scanning electron microscopy (SEM) takes advantage of distinct detectors to visualise secondary and back-scattering electrons. Here, we report an integrated approach that relies on these two detection methods to simultaneously acquire correlated information on plasma membrane topography and curvature-sensitive cytosolic protein localization in intact cell samples. We further provide detailed preparation and staining protocols, as well as a thorough example-based discussion for imaging optimisation. Collectively, the presented method enables rapid and precise analysis of cytosolic proteins adjacent to cellular membranes with a resolution of ~100 nm, without time-consuming preparations or errors induced by sequential visualisation present in fluorescence-based correlative approaches.
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Affiliation(s)
- Isabell Begemann
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149 Münster, Germany; (I.B.); (U.K.); (H.N.); (J.K.)
- Interfaculty Centre ‘Cells in Motion’, University of Muenster, Waldeyerstr. 15, 48149 Münster, Germany
| | - Ulrike Keller
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149 Münster, Germany; (I.B.); (U.K.); (H.N.); (J.K.)
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149 Münster, Germany; (I.B.); (U.K.); (H.N.); (J.K.)
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149 Münster, Germany; (I.B.); (U.K.); (H.N.); (J.K.)
- Interfaculty Centre ‘Cells in Motion’, University of Muenster, Waldeyerstr. 15, 48149 Münster, Germany
| | - Milos Galic
- Institute of Medical Physics and Biophysics, University of Muenster, Robert-Koch-Str. 31, 48149 Münster, Germany; (I.B.); (U.K.); (H.N.); (J.K.)
- Interfaculty Centre ‘Cells in Motion’, University of Muenster, Waldeyerstr. 15, 48149 Münster, Germany
- Correspondence:
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15
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Galstyan A, Ricker A, Nüsse H, Klingauf J, Dobrindt U. Exploring the Impact of Coordination-Driven Self Assembly on the Antibacterial Activity of Low-Symmetry Phthalocyanines. ACS Appl Bio Mater 2019; 3:400-411. [DOI: 10.1021/acsabm.9b00873] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Anzhela Galstyan
- Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Busso-Peus Strasse 10, 48149 Münster, Germany
| | - Andrea Ricker
- Institute of Medical Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Ulrich Dobrindt
- Institut of Hygiene, Westfälische Wilhelms-Universität Münster, Mendelstrasse 7, 48149 Münster, Germany
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16
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Messmer D, Sánchez-Ferrer A, Tacke S, Yu H, Nüsse H, Klingauf J, Wepf R, Kröger M, Halperin A, Mezzenga R, Schlüter AD. Can one determine the density of an individual synthetic macromolecule? Soft Matter 2019; 15:6547-6556. [PMID: 31359025 DOI: 10.1039/c9sm01220f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Dendronized polymers (DPs) are large and compact main-chain linear polymers with a cylindrical shape and cross-sectional diameters of up to ∼15 nm. They are therefore considered molecular objects, and it was of interest whether given their experimentally accessible, well-defined dimensions, the density of individual DPs could be determined. We present measurements on individual, deposited DP chains, providing molecular dimensions from scanning and transmission electron microscopy and mass-per-length values from quantitative scanning transmission electron microscopy. These results are compared with density values obtained from small-angle X-ray scattering on annealed bulk specimen and with classical envelope density measurements, obtained using hydrostatic weighing or a density gradient column. The samples investigated comprise a series of DPs with side groups of dendritic generations g = 1-8. The key findings are a very large spread of the density values over all samples and methods, and a consistent increase of densities with g over all methods. While this work highlights the advantages and limitations of the applied methods, it does not provide a conclusive answer to the question of which method(s) to use for the determination of densities of individual molecular objects. We are nevertheless confident that these first attempts to answer this challenging question will stimulate more research into this important aspect of polymer and soft matter science.
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Affiliation(s)
- Daniel Messmer
- Department of Materials, ETH Zürich, Polymer Chemistry & Polymer Physics, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
| | - Antoni Sánchez-Ferrer
- Department of Health Sciences and Technology, ETH Zürich, Laboratory of Food and Soft Materials, Schmelzbergstrasse 9, 8092 Zürich, Switzerland.
| | - Sebastian Tacke
- Scientific Center for Optical and Electron Microscopy, ETH Zürich, Otto-Stern-Weg 3, 8093 Zürich, Switzerland
| | - Hao Yu
- Department of Materials, ETH Zürich, Polymer Chemistry & Polymer Physics, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
| | - Harald Nüsse
- Institute of Medial Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Jürgen Klingauf
- Institute of Medial Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Roger Wepf
- Institute of Medial Physics and Biophysics, Westfälische Wilhelms-Universität Münster, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Martin Kröger
- Department of Materials, ETH Zürich, Polymer Chemistry & Polymer Physics, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
| | - Avraham Halperin
- Laboratoire de Spectrometrie Physique, CNRS University Joseph Fourier, BP 87, 38402 Saint Martin d'Hères cedex, France
| | - Raffaele Mezzenga
- Department of Health Sciences and Technology, ETH Zürich, Laboratory of Food and Soft Materials, Schmelzbergstrasse 9, 8092 Zürich, Switzerland.
| | - A Dieter Schlüter
- Department of Materials, ETH Zürich, Polymer Chemistry & Polymer Physics, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
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17
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Dlugos CP, Picciotto C, Lepa C, Krakow M, Stöber A, Eddy ML, Weide T, Jeibmann A, P Krahn M, Van Marck V, Klingauf J, Ricker A, Wedlich-Söldner R, Pavenstädt H, Klämbt C, George B. Nephrin Signaling Results in Integrin β1 Activation. J Am Soc Nephrol 2019; 30:1006-1019. [PMID: 31097607 DOI: 10.1681/asn.2018040362] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [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: 04/07/2018] [Accepted: 03/18/2019] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Patients with certain mutations in the gene encoding the slit diaphragm protein Nephrin fail to develop functional slit diaphragms and display severe proteinuria. Many adult-onset glomerulopathies also feature alterations in Nephrin expression and function. Nephrin signals from the podocyte slit diaphragm to the Actin cytoskeleton by recruiting proteins that can interact with C3G, a guanine nucleotide exchange factor of the small GTPase Rap1. Because Rap activity affects formation of focal adhesions, we hypothesized that Nephrin transmits signals to the Integrin receptor complex, which mediates podocyte adhesion to the extracellular matrix. METHODS To investigate Nephrin's role in transmitting signals to the Integrin receptor complex, we conducted genetic studies in Drosophila nephrocytes and validated findings from Drosophila in a cultured human podocyte model. RESULTS Drosophila nephrocytes form a slit diaphragm-like filtration barrier and express the Nephrin ortholog Sticks and stones (Sns). A genetic screen identified c3g as necessary for nephrocyte function. In vivo, nephrocyte-specific gene silencing of sns or c3g compromised nephrocyte filtration and caused nephrocyte diaphragm defects. Nephrocytes with impaired Sns or C3G expression displayed an altered localization of Integrin and the Integrin-associated protein Talin. Furthermore, gene silencing of c3g partly rescued nephrocyte diaphragm defects of an sns overexpression phenotype, pointing to genetic interaction of sns and c3g in nephrocytes. We also found that activated Nephrin recruited phosphorylated C3G and resulted in activation of Integrin β1 in cultured podocytes. CONCLUSIONS Our findings suggest that Nephrin can mediate a signaling pathway that results in activation of Integrin β1 at focal adhesions, which may affect podocyte attachment to the extracellular matrix.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Christian Klämbt
- Neurobiology, Westfälische-Wilhelms University Münster, Münster, Germany
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18
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Viplav A, Saha T, Huertas J, Selenschik P, Ebrahimkutty MP, Grill D, Lehrich J, Hentschel A, Biasizzo M, Mengoni S, Ahrends R, Gerke V, Cojocaru V, Klingauf J, Galic M. ArhGEF37 assists dynamin 2 during clathrin-mediated endocytosis. J Cell Sci 2019; 132:jcs.226530. [PMID: 30926623 PMCID: PMC6526708 DOI: 10.1242/jcs.226530] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 03/22/2019] [Indexed: 12/20/2022] Open
Abstract
Clathrin-mediated endocytosis (CME) engages over 30 proteins to secure efficient cargo and membrane uptake. While the function of most core CME components is well established, auxiliary mechanisms crucial for fine-tuning and adaptation remain largely elusive. In this study, we identify ArhGEF37, a currently uncharacterized protein, as a constituent of CME. Structure prediction together with quantitative cellular and biochemical studies present a unique BAR domain and PI(4,5)P2-dependent protein–membrane interactions. Functional characterization yields accumulation of ArhGEF37 at dynamin 2-rich late endocytic sites and increased endocytosis rates in the presence of ArhGEF37. Together, these results introduce ArhGEF37 as a regulatory protein involved in endocytosis. Summary: Accumulation of ArhGEF37 at dynamin 2-rich late endocytic sites yields increased rates of endocytosis.
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Affiliation(s)
- Abhiyan Viplav
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - Tanumoy Saha
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - Jan Huertas
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Computational Structural Biology Group, Dept. of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Muenster, 48149 Muenster, Germany
| | - Philipp Selenschik
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - Mirsana P Ebrahimkutty
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - David Grill
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute for Medical Biochemistry, ZMBE, University of Muenster, 48149 Muenster, Germany
| | - Julia Lehrich
- Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - Andreas Hentschel
- Leibniz-Institut für Analytische Wissenschaften, ISAS, 44139 Dortmund, Germany
| | - Monika Biasizzo
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - Simone Mengoni
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - Robert Ahrends
- Leibniz-Institut für Analytische Wissenschaften, ISAS, 44139 Dortmund, Germany
| | - Volker Gerke
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute for Medical Biochemistry, ZMBE, University of Muenster, 48149 Muenster, Germany
| | - Vlad Cojocaru
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Computational Structural Biology Group, Dept. of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Muenster, 48149 Muenster, Germany
| | - Jürgen Klingauf
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
| | - Milos Galic
- DFG Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany .,Institute of Medical Physics and Biophysics, University of Muenster, 48149 Muenster, Germany
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19
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Lima AM, Wegner SV, Martins Cavaco AC, Estevão-Costa MI, Sanz-Soler R, Niland S, Nosov G, Klingauf J, Spatz JP, Eble JA. The spatial molecular pattern of integrin recognition sites and their immobilization to colloidal nanobeads determine α2β1 integrin-dependent platelet activation. Biomaterials 2018; 167:107-120. [PMID: 29567387 DOI: 10.1016/j.biomaterials.2018.03.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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: 10/22/2017] [Revised: 03/02/2018] [Accepted: 03/14/2018] [Indexed: 11/15/2022]
Abstract
Collagen, a strong platelet activator, is recognized by integrin α2β1 and GPVI. It induces aggregation, if added to suspended platelets, or platelet adhesion if immobilized to a surface. The recombinant non-prolylhydroxylated mini-collagen FC3 triple helix containing one α2β1 integrin binding site is a tool to specifically study how α2β1 integrin activates platelet. Whereas soluble FC3 monomers antagonistically block collagen-induced platelet activation, immobilization of several FC3 molecules to an interface or to colloidal nanobeads determines the agonistic action of FC3. Nanopatterning of FC3 reveals that intermolecular distances below 64 nm between α2β1 integrin binding sites trigger signaling through dot-like clusters of α2β1 integrin, which are visible in high resolution microscopy with dSTORM. Upon signaling, these integrin clusters increase in numbers per platelet, but retain their individual size. Immobilization of several FC3 to 100 nm-sized nanobeads identifies α2β1 integrin-triggered signaling in platelets to occur at a twentyfold slower rate than collagen, which activates platelet in a fast integrative signaling via different platelet receptors. As compared to collagen stimulation, FC3-nanobead-triggered signaling cause a significant stronger activation of the protein kinase BTK, a weak and dispensable activation of PDK1, as well as a distinct phosphorylation pattern of PDB/Akt.
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Affiliation(s)
- Augusto Martins Lima
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Waldeyerstr. 15, 48149 Muenster, Germany
| | - Seraphine V Wegner
- Department of Biophysical Chemistry, University of Heidelberg, Heidelberg, Germany, and Max Plank-Institute for Polymer Research, Mainz, Germany
| | - Ana C Martins Cavaco
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Waldeyerstr. 15, 48149 Muenster, Germany
| | - Maria Inacia Estevão-Costa
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Waldeyerstr. 15, 48149 Muenster, Germany
| | - Raquel Sanz-Soler
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Waldeyerstr. 15, 48149 Muenster, Germany
| | - Stephan Niland
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Waldeyerstr. 15, 48149 Muenster, Germany
| | - Georgii Nosov
- Institute for Physical Medicine and Biophysics, University of Muenster, Muenster, Germany
| | - Jürgen Klingauf
- Institute for Physical Medicine and Biophysics, University of Muenster, Muenster, Germany
| | - Joachim P Spatz
- Department of Biophysical Chemistry, University of Heidelberg, Heidelberg, Germany, and Max Planck-Institute for Medical Research, Department of Cellular Biophysics, Heidelberg, Germany
| | - Johannes A Eble
- Institute of Physiological Chemistry and Pathobiochemistry, University of Muenster, Waldeyerstr. 15, 48149 Muenster, Germany.
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20
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Schürmann S, Steffes G, Manikowski D, Kastl P, Malkus U, Bandari S, Ohlig S, Ortmann C, Rebollido-Rios R, Otto M, Nüsse H, Hoffmann D, Klämbt C, Galic M, Klingauf J, Grobe K. Proteolytic processing of palmitoylated Hedgehog peptides specifies the 3-4 intervein region of the Drosophila wing. eLife 2018. [PMID: 29522397 PMCID: PMC5844694 DOI: 10.7554/elife.33033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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] [Indexed: 01/12/2023] Open
Abstract
Cell fate determination during development often requires morphogen transport from producing to distant responding cells. Hedgehog (Hh) morphogens present a challenge to this concept, as all Hhs are synthesized as terminally lipidated molecules that form insoluble clusters at the surface of producing cells. While several proposed Hh transport modes tie directly into these unusual properties, the crucial step of Hh relay from producing cells to receptors on remote responding cells remains unresolved. Using wing development in Drosophila melanogaster as a model, we show that Hh relay and direct patterning of the 3–4 intervein region strictly depend on proteolytic removal of lipidated N-terminal membrane anchors. Site-directed modification of the N-terminal Hh processing site selectively eliminated the entire 3–4 intervein region, and additional targeted removal of N-palmitate restored its formation. Hence, palmitoylated membrane anchors restrict morphogen spread until site-specific processing switches membrane-bound Hh into bioactive forms with specific patterning functions. Each cell in a developing embryo receives information that determines what type of body structure it will form. In fruit flies, this information is partly given by a protein called Hedgehog. In the embryo cells that receive it, Hedgehog can trigger a series of events which activate certain genes and thereby regulate structure formation. The Hedgehog proteins are produced by a different organizing group of cells: from there they transport within the embryo, creating a gradient. Depending on where a responding cell is in the embryo, it receives a different amount of Hedgehog, which gives the cell its identity. For example, Hedgehog proteins form a gradient across a fruit fly’s developing wing, which creates a visible vein pattern. How Hedgehog proteins form gradients is enigmatic, however, because once produced, they cling to the cells that created them. The reason for this unusual behavior is that the two ends of the Hedgehog protein are attached to a different fat molecule. In particular, one extremity is linked to a fat molecule called palmitate. These ends’ fatty additions anchor Hedgehog to the cells that produced them. Then, the tethered proteins gather together to form chain-like clusters where they inactivate each other: the extremity with the palmitate ‘hides’ the portion of the neighboring protein that binds to the receiving cells. It is still unclear how Hedgehog can be activated and released to reach these faraway cells. One hypothesis is that an enzyme comes to the clusters and frees the proteins by cutting both of Hedgehog’s fatty anchors. Thanks to how the palmitate tethers Hedgehog to the cell, the protein is positioned in such a way that when the enzyme makes its snip, the binding site on the neighboring Hedgehog gets exposed: this protein is activated and, when also cut by the enzyme, released. Here, Schürmann et al. create an array of mutant Hedgehog proteins – for example some without palmitate, some with palmitate that cannot be removed by the enzyme – and study how they affect the development of the wing’s pattern in the fruit fly. Coupled with the imaging of the clusters, these experiments support the hypothesis that the palmitate anchor is necessary so that Hedgehog proteins can be turned on before diffusing away. The Hedgehog family of proteins is also present in humans, where it presides over the development of the embryo but is also involved in cancer. Understanding how Hedgehog works in the fruit fly could lead to new discoveries in humans too.
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Affiliation(s)
- Sabine Schürmann
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
| | - Georg Steffes
- Center for Medical Biotechnology, University of Duisburg-Essen, Essen, Germany.,Institute of Neurobiology, University of Münster, Münster, Germany
| | - Dominique Manikowski
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
| | - Philipp Kastl
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
| | - Ursula Malkus
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Shyam Bandari
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
| | - Stefanie Ohlig
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
| | - Corinna Ortmann
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
| | | | - Mandy Otto
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Daniel Hoffmann
- Center for Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Christian Klämbt
- Institute of Neurobiology, University of Münster, Münster, Germany
| | - Milos Galic
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Kay Grobe
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany.,Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Münster, Germany
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21
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Shah B, Lutter D, Tsytsyura Y, Glyvuk N, Sakakibara A, Klingauf J, Püschel AW. Rap1 GTPases Are Master Regulators of Neural Cell Polarity in the Developing Neocortex. Cereb Cortex 2018; 27:1253-1269. [PMID: 26733533 DOI: 10.1093/cercor/bhv341] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
During the development of the mammalian neocortex, the generation of neurons by neural progenitors and their migration to the final position are closely coordinated. The highly polarized radial glial cells (RGCs) serve both as progenitor cells to generate neurons and as support for the migration of these neurons. After their generation, neurons transiently assume a multipolar morphology before they polarize and begin their migration along the RGCs. Here, we show that Rap1 GTPases perform essential functions for cortical organization as master regulators of cell polarity. Conditional deletion of Rap1 GTPases leads to a complete loss of cortical lamination. In RGCs, Rap1 GTPases are required to maintain their polarized organization. In newborn neurons, the loss of Rap1 GTPases prevents the formation of axons and leading processes and thereby interferes with radial migration. Taken together, the loss of RGC and neuronal polarity results in the disruption of cortical organization.
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Affiliation(s)
- Bhavin Shah
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, D-48149 Münster, Germany.,Cells-in-Motion Cluster of Excellence, University of Münster, D-48149 Münster, Germany
| | - Daniela Lutter
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, D-48149 Münster, Germany
| | | | - Natalia Glyvuk
- Institute of Medical Physics and Biophysics, D-48149 Münster, Germany
| | - Akira Sakakibara
- College of Life and Health Sciences, Chubu University, Kasugai 487-8501, Japan.,Department of Anatomy and Cell Biology, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
| | - Jürgen Klingauf
- Cells-in-Motion Cluster of Excellence, University of Münster, D-48149 Münster, Germany.,Institute of Medical Physics and Biophysics, D- 48149 Münster, Germany
| | - Andreas W Püschel
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, D-48149 Münster, Germany.,Cells-in-Motion Cluster of Excellence, University of Münster, D-48149 Münster, Germany
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22
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Kahms M, Klingauf J. Novel pH-Sensitive Lipid Based Exo-Endocytosis Tracers Reveal Fast Intermixing of Synaptic Vesicle Pools. Front Cell Neurosci 2018; 12:18. [PMID: 29456492 PMCID: PMC5801418 DOI: 10.3389/fncel.2018.00018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 01/11/2018] [Indexed: 11/13/2022] Open
Abstract
Styryl dyes and genetically encoded pH-sensitive fluorescent proteins like pHluorin are well-established tools for the optical analysis of synaptic vesicle (SV) recycling at presynaptic boutons. Here, we describe the development of a new class of fluorescent probes based on pH-sensitive organic dyes covalently bound to lipids, providing a promising complementary assay to genetically encoded fluorescent probes. These new optical tracers allow a pure read out of membrane turnover during synaptic activity and visualization of multiple rounds of stimulation-dependent SV recycling without genetic perturbation. Measuring the incorporation efficacy of different dye-labeled lipids into budding SVs, we did not observe an enrichment of lipids with affinity for liquid ordered membrane domains. But most importantly, we found no evidence for a static segregation of SVs into recycling and resting pools. A small but significant fraction of SVs that is reluctant to release during a first round of evoked activity can be exocytosed during a second bout of stimulation, showing fast intermixing of SV pools within seconds. Furthermore, we found that SVs recycling spontaneously have a higher chance to re-occupy release sites than SVs recycling during high-frequency evoked activity. In summary, our data provide strong evidence for a highly dynamic and use-dependent control of the fractions of releasable or resting SVs.
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Affiliation(s)
- Martin Kahms
- Department of Cellular Biophysics, Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Jürgen Klingauf
- Department of Cellular Biophysics, Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
- IZKF Münster and Cluster of Excellence Cells in Motion, University of Münster, Münster, Germany
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23
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Mäsing F, Nüsse H, Klingauf J, Studer A. Visible-Light-Enabled Preparation of Palladium Nanoparticles and Application as Catalysts for Suzuki–Miyaura Coupling. Org Lett 2018; 20:752-755. [DOI: 10.1021/acs.orglett.7b03892] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Florian Mäsing
- Institute
of Organic Chemistry, University of Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Harald Nüsse
- Institute
of Medical Physics and Biophysics, University of Münster, Robert-Koch-Strasse
31, 48149 Münster, Germany
| | - Jürgen Klingauf
- Institute
of Medical Physics and Biophysics, University of Münster, Robert-Koch-Strasse
31, 48149 Münster, Germany
| | - Armido Studer
- Institute
of Organic Chemistry, University of Münster, Corrensstrasse 40, 48149 Münster, Germany
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24
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Martineau M, Guzman RE, Fahlke C, Klingauf J. VGLUT1 functions as a glutamate/proton exchanger with chloride channel activity in hippocampal glutamatergic synapses. Nat Commun 2017; 8:2279. [PMID: 29273736 PMCID: PMC5741633 DOI: 10.1038/s41467-017-02367-6] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [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: 10/31/2016] [Accepted: 11/24/2017] [Indexed: 12/18/2022] Open
Abstract
Glutamate is the major excitatory transmitter in the vertebrate nervous system. To maintain synaptic efficacy, recycling synaptic vesicles (SV) are refilled with glutamate by vesicular glutamate transporters (VGLUTs). The dynamics and mechanism of glutamate uptake in intact neurons are still largely unknown. Here, we show by live-cell imaging with pH- and chloride-sensitive fluorescent probes in cultured hippocampal neurons of wild-type and VGLUT1-deficient mice that in SVs VGLUT functions as a glutamate/proton exchanger associated with a channel-like chloride conductance. After endocytosis most internalized Cl− is substituted by glutamate in an electrically, and presumably osmotically, neutral manner, and this process is driven by both the Cl− gradient itself and the proton motive force provided by the vacuolar H+-ATPase. Our results shed light on the transport mechanism of VGLUT under physiological conditions and provide a framework for how modulation of glutamate transport via Cl− and pH can change synaptic strength. During neurotransmission synaptic vesicles are filled with glutamate by vesicular glutamate transporters (VGLUTs). Here, authors image intact neurons and show that in synaptic vesicles VGLUT functions as a glutamate/proton exchanger associated with a channel-like chloride conductance.
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Affiliation(s)
- Magalie Martineau
- Department of Cellular Biophysics, Institute for Medical Physics and Biophysics, University of Muenster, 48149, Muenster, Germany. .,University of Bordeaux and Centre National de la Recherche Scientifique, Interdisciplinary Institute for Neuroscience, UMR 5297, F-33000, Bordeaux, France.
| | - Raul E Guzman
- Institute of Complex Systems, Zelluläre Biophysik (ICS-4), Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Christoph Fahlke
- Institute of Complex Systems, Zelluläre Biophysik (ICS-4), Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Jürgen Klingauf
- Department of Cellular Biophysics, Institute for Medical Physics and Biophysics, University of Muenster, 48149, Muenster, Germany. .,IZKF Münster and Cluster of Excellence EXC 1003, Cells in Motion (CiM), 48149, Muenster, Germany.
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25
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Boening D, Gauthier-Kemper A, Gmeiner B, Klingauf J. Cluster Recognition by Delaunay Triangulation of Synaptic Proteins in 3D. ACTA ACUST UNITED AC 2017; 1:e1700091. [PMID: 32646194 DOI: 10.1002/adbi.201700091] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 06/17/2017] [Indexed: 11/06/2022]
Abstract
The advent of super-resolution microscopy opens up the opportunity to study biological structures in unprecedented detail. However, revealing quantitative information about the spatial organization of a set of labeled proteins requires sophisticated analysis. This study introduces a novel robust cluster recognition algorithm based on Delaunay triangulation (CRADT), which can handle complex datasets generated by 3D super-resolution microscopy. This algorithm allows determining volume and shape of protein clusters in 3D. The study demonstrates its performance by applying this algorithm on dual-color 3D super-resolved measurements of mouse hippocampal synapses, stained against the presynaptic active zone marker protein Bassoon and the opposing postsynaptic density protein Homer as well as the exo- and endocytosis machinery proteins Synaptobrevin and Clathrin.
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Affiliation(s)
- Daniel Boening
- Department of Cellular Biophysics, Institute of Medical Physics and Biophysics, University of Münster, 48149, Münster, Germany.,Max Planck Institute for the Science of Light, Nano-Optics Division, 91058, Erlangen, Germany
| | - Anne Gauthier-Kemper
- Department of Cellular Biophysics, Institute of Medical Physics and Biophysics, University of Münster, 48149, Münster, Germany
| | - Benjamin Gmeiner
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Jürgen Klingauf
- Department of Cellular Biophysics, Institute of Medical Physics and Biophysics, University of Münster, 48149, Münster, Germany.,Cluster of Excellence EXC 1003, Cells in Motion, CiM, 48149, Münster, Germany
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26
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de Vries WC, Grill D, Tesch M, Ricker A, Nüsse H, Klingauf J, Studer A, Gerke V, Ravoo BJ. Inside Back Cover: Reversible Stabilization of Vesicles: Redox-Responsive Polymer Nanocontainers for Intracellular Delivery (Angew. Chem. Int. Ed. 32/2017). Angew Chem Int Ed Engl 2017. [DOI: 10.1002/anie.201705754] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Wilke C. de Vries
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
| | - David Grill
- Institute of Medical Biochemistry, Center for Molecular Biology of Inflammation; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Strasse 56 48149 Münster Germany
| | - Matthias Tesch
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
| | - Andrea Ricker
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität Münster; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität Münster; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität Münster; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Armido Studer
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
| | - Volker Gerke
- Institute of Medical Biochemistry, Center for Molecular Biology of Inflammation; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Strasse 56 48149 Münster Germany
| | - Bart Jan Ravoo
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
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27
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de Vries WC, Grill D, Tesch M, Ricker A, Nüsse H, Klingauf J, Studer A, Gerke V, Ravoo BJ. Innenrücktitelbild: Reversible Stabilisierung von Vesikeln: redox-responsive Polymer-Nanocontainer für den Transport in das Zellinnere (Angew. Chem. 32/2017). Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wilke C. de Vries
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
| | - David Grill
- Institut für Medizinische Biochemie, Zentrum für Molekularbiologie der Entzündung; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Straße 56 48149 Münster Deutschland
| | - Matthias Tesch
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
| | - Andrea Ricker
- Institut für Medizinische Physik und Biophysik; Westfälische Wilhelms-Universität Münster; Robert-Koch-Straße 31 48149 Münster Deutschland
| | - Harald Nüsse
- Institut für Medizinische Physik und Biophysik; Westfälische Wilhelms-Universität Münster; Robert-Koch-Straße 31 48149 Münster Deutschland
| | - Jürgen Klingauf
- Institut für Medizinische Physik und Biophysik; Westfälische Wilhelms-Universität Münster; Robert-Koch-Straße 31 48149 Münster Deutschland
| | - Armido Studer
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
| | - Volker Gerke
- Institut für Medizinische Biochemie, Zentrum für Molekularbiologie der Entzündung; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Straße 56 48149 Münster Deutschland
| | - Bart Jan Ravoo
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
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28
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Bodzęta A, Kahms M, Klingauf J. The Presynaptic v-ATPase Reversibly Disassembles and Thereby Modulates Exocytosis but Is Not Part of the Fusion Machinery. Cell Rep 2017; 20:1348-1359. [DOI: 10.1016/j.celrep.2017.07.040] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 06/23/2017] [Accepted: 07/14/2017] [Indexed: 11/15/2022] Open
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29
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de Vries WC, Grill D, Tesch M, Ricker A, Nüsse H, Klingauf J, Studer A, Gerke V, Ravoo BJ. Reversible Stabilisierung von Vesikeln: redox-responsive Polymer-Nanocontainer für den Transport in das Zellinnere. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702620] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Wilke C. de Vries
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
| | - David Grill
- Institut für Medizinische Biochemie, Zentrum für Molekularbiologie der Entzündung; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Straße 56 48149 Münster Deutschland
| | - Matthias Tesch
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
| | - Andrea Ricker
- Institut für Medizinische Physik und Biophysik; Westfälische Wilhelms-Universität Münster; Robert-Koch-Straße 31 48149 Münster Deutschland
| | - Harald Nüsse
- Institut für Medizinische Physik und Biophysik; Westfälische Wilhelms-Universität Münster; Robert-Koch-Straße 31 48149 Münster Deutschland
| | - Jürgen Klingauf
- Institut für Medizinische Physik und Biophysik; Westfälische Wilhelms-Universität Münster; Robert-Koch-Straße 31 48149 Münster Deutschland
| | - Armido Studer
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
| | - Volker Gerke
- Institut für Medizinische Biochemie, Zentrum für Molekularbiologie der Entzündung; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Straße 56 48149 Münster Deutschland
| | - Bart Jan Ravoo
- Organisch-Chemisches Institut und Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstraße 40 48149 Münster Deutschland
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30
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de Vries WC, Grill D, Tesch M, Ricker A, Nüsse H, Klingauf J, Studer A, Gerke V, Ravoo BJ. Reversible Stabilization of Vesicles: Redox-Responsive Polymer Nanocontainers for Intracellular Delivery. Angew Chem Int Ed Engl 2017; 56:9603-9607. [DOI: 10.1002/anie.201702620] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 04/18/2017] [Indexed: 12/28/2022]
Affiliation(s)
- Wilke C. de Vries
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
| | - David Grill
- Institute of Medical Biochemistry, Center for Molecular Biology of Inflammation; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Strasse 56 48149 Münster Germany
| | - Matthias Tesch
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
| | - Andrea Ricker
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität Münster; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität Münster; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität Münster; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Armido Studer
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
| | - Volker Gerke
- Institute of Medical Biochemistry, Center for Molecular Biology of Inflammation; Westfälische Wilhelms-Universität Münster; Von-Esmarch-Strasse 56 48149 Münster Germany
| | - Bart Jan Ravoo
- Organic Chemistry Institute and Center for Soft Nanoscience; Westfälische Wilhelms-Universität Münster; Correnstrasse 40 48149 Münster Germany
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31
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Mäsing F, Nüsse H, Klingauf J, Studer A. Light Mediated Preparation of Palladium Nanoparticles as Catalysts for Alkyne cis-Semihydrogenation. Org Lett 2017; 19:2658-2661. [DOI: 10.1021/acs.orglett.7b00999] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Florian Mäsing
- Institute
of Organic Chemistry, University of Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Harald Nüsse
- Institute
of Medical Physics and Biophysics, University of Münster, Robert-Koch-Strasse
31, 48149 Münster, Germany
| | - Jürgen Klingauf
- Institute
of Medical Physics and Biophysics, University of Münster, Robert-Koch-Strasse
31, 48149 Münster, Germany
| | - Armido Studer
- Institute
of Organic Chemistry, University of Münster, Corrensstrasse 40, 48149 Münster, Germany
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32
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Tacke S, Krzyzanek V, Nüsse H, Wepf RA, Klingauf J, Reichelt R. A Versatile High-Vacuum Cryo-transfer System for Cryo-microscopy and Analytics. Biophys J 2016; 110:758-65. [PMID: 26910419 DOI: 10.1016/j.bpj.2016.01.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 01/17/2016] [Accepted: 01/20/2016] [Indexed: 02/07/2023] Open
Abstract
Cryogenic microscopy methods have gained increasing popularity, as they offer an unaltered view on the architecture of biological specimens. As a prerequisite, samples must be handled under cryogenic conditions below their recrystallization temperature, and contamination during sample transfer and handling must be prevented. We present a high-vacuum cryo-transfer system that streamlines the entire handling of frozen-hydrated samples from the vitrification process to low temperature imaging for scanning transmission electron microscopy and transmission electron microscopy. A template for cryo-electron microscopy and multimodal cryo-imaging approaches with numerous sample transfer steps is presented.
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Affiliation(s)
- Sebastian Tacke
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany.
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments, The Czech Academy of Sciences, Brno, Czech Republic
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Roger Albert Wepf
- Scientific Center for Optical and Electron Microscopy, ETH Zürich, Zürich, Switzerland
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
| | - Rudolf Reichelt
- Institute of Medical Physics and Biophysics, University of Münster, Münster, Germany
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33
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Mäsing F, Wang X, Nüsse H, Klingauf J, Studer A. Facile Light-Mediated Preparation of Small Polymer-Coated Palladium-Nanoparticles and Their Application as Catalysts for Alkyne Semi-Hydrogenation. Chemistry 2016; 23:6014-6018. [DOI: 10.1002/chem.201603297] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Florian Mäsing
- Institute of Organic Chemistry; Westfälische Wilhelms-Universität; Corrensstrasse 40 48149 Münster Germany
| | - Xi Wang
- Institute of Organic Chemistry; Westfälische Wilhelms-Universität; Corrensstrasse 40 48149 Münster Germany
| | - Harald Nüsse
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics; Westfälische Wilhelms-Universität; Robert-Koch-Strasse 31 48149 Münster Germany
| | - Armido Studer
- Institute of Organic Chemistry; Westfälische Wilhelms-Universität; Corrensstrasse 40 48149 Münster Germany
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34
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Grilc S, Kuster V, Zorec R, Japelj I, Ilievski V, Budihna MV, Marhl M, Brumen M, Schuster S, Heinrich R, Martin TFJ, Pozzan T, Rupnik M, Kreft M, Sikdar SK, Zorec R, Sikdar SK, Kreft M, Smith SM, Namkung Y, Foletti D, Klingauf J, Shin HS, Scheller RH, Tsien RW, Zupančič G. Abstracts. Pflugers Arch 2016. [DOI: 10.1007/s004240000128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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35
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Saha T, Rathmann I, Viplav A, Panzade S, Begemann I, Rasch C, Klingauf J, Matis M, Galic M. Automated analysis of filopodial length and spatially resolved protein concentration via adaptive shape tracking. Mol Biol Cell 2016; 27:3616-3626. [PMID: 27535428 PMCID: PMC5221593 DOI: 10.1091/mbc.e16-06-0406] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 08/11/2016] [Indexed: 12/05/2022] Open
Abstract
A novel approach based on the convex-hull algorithm is used for parallel analysis of growth dynamics and relative spatiotemporal protein concentration along flexible filopodial protrusions. Testing of filopodia formation in silico, in vitro, and in vivo validates the robustness and sensitivity of the proposed approach. Filopodia are dynamic, actin-rich structures that transiently form on a variety of cell types. To understand the underlying control mechanisms requires precise monitoring of localization and concentration of individual regulatory and structural proteins as filopodia elongate and subsequently retract. Although several methods exist that analyze changes in filopodial shape, a software solution to reliably correlate growth dynamics with spatially resolved protein concentration along the filopodium independent of bending, lateral shift, or tilting is missing. Here we introduce a novel approach based on the convex-hull algorithm for parallel analysis of growth dynamics and relative spatiotemporal protein concentration along flexible filopodial protrusions. Detailed in silico tests using various geometries confirm that our technique accurately tracks growth dynamics and relative protein concentration along the filopodial length for a broad range of signal distributions. To validate our technique in living cells, we measure filopodial dynamics and quantify spatiotemporal localization of filopodia-associated proteins during the filopodial extension–retraction cycle in a variety of cell types in vitro and in vivo. Together these results show that the technique is suitable for simultaneous analysis of growth dynamics and spatiotemporal protein enrichment along filopodia. To allow readily application by other laboratories, we share source code and instructions for software handling.
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Affiliation(s)
- Tanumoy Saha
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany.,Institute of Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
| | - Isabel Rathmann
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany.,Institute of Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
| | - Abhiyan Viplav
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany.,Institute of Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
| | - Sadhana Panzade
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany.,Institute of Cell Biology, University of Münster, 48149 Münster, Germany
| | - Isabell Begemann
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany.,Institute of Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
| | - Christiane Rasch
- Institute of Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
| | - Jürgen Klingauf
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany.,Institute of Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
| | - Maja Matis
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany.,Institute of Cell Biology, University of Münster, 48149 Münster, Germany
| | - Milos Galic
- DFG Cluster of Excellence Cells in Motion (EXC 1003), University of Münster, 48149 Münster, Germany .,Institute of Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
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36
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Shah B, Lutter D, Bochenek ML, Kato K, Tsytsyura Y, Glyvuk N, Sakakibara A, Klingauf J, Adams RH, Püschel AW. C3G/Rapgef1 Is Required in Multipolar Neurons for the Transition to a Bipolar Morphology during Cortical Development. PLoS One 2016; 11:e0154174. [PMID: 27111087 PMCID: PMC4844105 DOI: 10.1371/journal.pone.0154174] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 04/08/2016] [Indexed: 12/03/2022] Open
Abstract
The establishment of a polarized morphology is essential for the development and function of neurons. During the development of the mammalian neocortex, neurons arise in the ventricular zone (VZ) from radial glia cells (RGCs) and leave the VZ to generate the cortical plate (CP). During their migration, newborn neurons first assume a multipolar morphology in the subventricular zone (SVZ) and lower intermediate zone (IZ). Subsequently, they undergo a multi-to-bipolar (MTB) transition to become bipolar in the upper IZ by developing a leading process and a trailing axon. The small GTPases Rap1A and Rap1B act as master regulators of neural cell polarity in the developing mouse neocortex. They are required for maintaining the polarity of RGCs and directing the MTB transition of multipolar neurons. Here we show that the Rap1 guanine nucleotide exchange factor (GEF) C3G (encoded by the Rapgef1 gene) is a crucial regulator of the MTB transition in vivo by conditionally inactivating the Rapgef1 gene in the developing mouse cortex at different time points during neuronal development. Inactivation of C3G results in defects in neuronal migration, axon formation and cortical lamination. Live cell imaging shows that C3G is required in cortical neurons for both the specification of an axon and the initiation of radial migration by forming a leading process.
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Affiliation(s)
- Bhavin Shah
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, Schloßplatz 5, D-48149 Münster, Germany
- Cells-in-Motion Cluster of Excellence, University of Münster, D-48149 Münster, Germany
| | - Daniela Lutter
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, Schloßplatz 5, D-48149 Münster, Germany
| | - Magdalena L. Bochenek
- Max-Planck-Institute for Molecular Biomedicine, Department of Tissue Morphogenesis, and University of Münster, Faculty of Medicine, D-48149 Münster, Germany
| | - Katsuhiro Kato
- Max-Planck-Institute for Molecular Biomedicine, Department of Tissue Morphogenesis, and University of Münster, Faculty of Medicine, D-48149 Münster, Germany
| | - Yaroslav Tsytsyura
- Institute of Medical Physics and Biophysics, Robert-Koch Straße 31, D-48149 Münster, Germany
| | - Natalia Glyvuk
- Institute of Medical Physics and Biophysics, Robert-Koch Straße 31, D-48149 Münster, Germany
| | - Akira Sakakibara
- College of Life and Health Sciences, Chubu University, Kasugai 487–8501, Japan
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, Robert-Koch Straße 31, D-48149 Münster, Germany
| | - Ralf H. Adams
- Max-Planck-Institute for Molecular Biomedicine, Department of Tissue Morphogenesis, and University of Münster, Faculty of Medicine, D-48149 Münster, Germany
- Cells-in-Motion Cluster of Excellence, University of Münster, D-48149 Münster, Germany
| | - Andreas W. Püschel
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, Schloßplatz 5, D-48149 Münster, Germany
- Cells-in-Motion Cluster of Excellence, University of Münster, D-48149 Münster, Germany
- * E-mail:
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Kemper B, Hristova YR, Tacke S, Stegemann L, van Bezouwen LS, Stuart MCA, Klingauf J, Strassert CA, Besenius P. Facile synthesis of a peptidic Au(I)-metalloamphiphile and its self-assembly into luminescent micelles in water. Chem Commun (Camb) 2016; 51:5253-6. [PMID: 25001106 DOI: 10.1039/c4cc03868a] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We report a short synthetic route for the preparation of a peptidic Au(I)-metalloamphiphile which, in buffered environments of physiological ionic strength, self-assembles into luminescent micellar nanostructures of 14 nm in diameter.
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Affiliation(s)
- Benedict Kemper
- Organic Chemistry Institute, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster, Germany.
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Rajappa R, Gauthier-Kemper A, Böning D, Hüve J, Klingauf J. Synaptophysin 1 Clears Synaptobrevin 2 from the Presynaptic Active Zone to Prevent Short-Term Depression. Cell Rep 2016; 14:1369-1381. [DOI: 10.1016/j.celrep.2016.01.031] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 10/23/2015] [Accepted: 01/06/2016] [Indexed: 10/22/2022] Open
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39
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Wedeking T, Löchte S, Birkholz O, Wallenstein A, Trahe J, Klingauf J, Piehler J, You C. Spatiotemporally Controlled Reorganization of Signaling Complexes in the Plasma Membrane of Living Cells. Small 2015; 11:5912-5918. [PMID: 26421417 DOI: 10.1002/smll.201502132] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 08/18/2015] [Indexed: 06/05/2023]
Abstract
Triggered immobilization of proteins in the plasma membrane of living cells into functional micropatterns is established by using an adaptor protein, which is comprised of an antiGFP nanobody fused to the HaloTag protein. Efficient in situ reorganization of the type I interferon receptor subunits as well as intact, fully functional signaling complexes in living cells are achieved by this method.
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Affiliation(s)
- Tim Wedeking
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Sara Löchte
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Oliver Birkholz
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Alexander Wallenstein
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Julia Trahe
- Institute of Medical Physics and Biophysics, University of Münster, Robert-Koch-Str. 31, Münster, 48149, Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003-CiM), University of Münster, Münster, 48149, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Münster, Robert-Koch-Str. 31, Münster, 48149, Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003-CiM), University of Münster, Münster, 48149, Germany
| | - Jacob Piehler
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Changjiang You
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
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40
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Mäsing F, Mardyukov A, Doerenkamp C, Eckert H, Malkus U, Nüsse H, Klingauf J, Studer A. Kontrollierte lichtvermittelte Synthese von Gold-Nanopartikeln über Norrish-Typ-I-Reaktion in photoaktiven Polymeren. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505133] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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41
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Mäsing F, Mardyukov A, Doerenkamp C, Eckert H, Malkus U, Nüsse H, Klingauf J, Studer A. Controlled Light-Mediated Preparation of Gold Nanoparticles by a Norrish Type I Reaction of Photoactive Polymers. Angew Chem Int Ed Engl 2015; 54:12612-7. [DOI: 10.1002/anie.201505133] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 07/20/2015] [Indexed: 12/22/2022]
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42
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Samanta A, Tesch M, Keller U, Klingauf J, Studer A, Ravoo BJ. Fabrication of Hydrophilic Polymer Nanocontainers by Use of Supramolecular Templates. J Am Chem Soc 2015; 137:1967-71. [DOI: 10.1021/ja511963g] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Avik Samanta
- Organic
Chemistry Institute and Graduate School of Chemistry and Center for
Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Correnstrasse
40, 48149 Münster, Germany
| | - Matthias Tesch
- Organic
Chemistry Institute and Graduate School of Chemistry and Center for
Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Correnstrasse
40, 48149 Münster, Germany
| | - Ulrike Keller
- Institute of Medical Physics and Biophysics, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, Robert-Koch-Strasse 31, 48149 Münster, Germany
| | - Armido Studer
- Organic
Chemistry Institute and Graduate School of Chemistry and Center for
Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Correnstrasse
40, 48149 Münster, Germany
| | - Bart Jan Ravoo
- Organic
Chemistry Institute and Graduate School of Chemistry and Center for
Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Correnstrasse
40, 48149 Münster, Germany
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Appel R, Tacke S, Klingauf J, Besenius P. Tuning the pH-triggered self-assembly of dendritic peptide amphiphiles using fluorinated side chains. Org Biomol Chem 2015; 13:1030-9. [DOI: 10.1039/c4ob02185a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We report the synthesis of a series of anionic dendritic peptide amphiphiles of increasing hydrophobic character and describe their self-assembly into supramolecular nanorods using pH and ionic strength dependent state diagrams.
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Affiliation(s)
- Ralph Appel
- Organic Chemistry Institute
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
- Center for Nanotechnology (CeNTech)
| | - Sebastian Tacke
- Department of Cellular Biophysics
- Institute of Medical Physics and Biophysics
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Jürgen Klingauf
- Department of Cellular Biophysics
- Institute of Medical Physics and Biophysics
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Pol Besenius
- Organic Chemistry Institute
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
- Center for Nanotechnology (CeNTech)
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Hua Y, Woehler A, Kahms M, Haucke V, Neher E, Klingauf J. Blocking endocytosis enhances short-term synaptic depression under conditions of normal availability of vesicles. Neuron 2014; 80:343-9. [PMID: 24139039 DOI: 10.1016/j.neuron.2013.08.010] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/13/2013] [Indexed: 12/01/2022]
Abstract
It is commonly thought that clathrin-mediated endocytosis is the rate-limiting step of synaptic transmission in small CNS boutons with limited capacity for synaptic vesicles, causing short-term depression during high rates of synaptic transmission. Here, we show by analyzing synaptopHluorin fluorescence that 200 action potentials evoke the same cumulative amount of vesicle fusion, irrespective of the frequency of stimulation (5-40 Hz), implying the absence of vesicle reuse, since the method used (alkaline-trapping) measures only first-round exocytosis. After blocking all slow or specifically clathrin-mediated endocytosis, however, the same stimulation patterns cause a rapid stimulation-frequency-dependent release depression. This form of depression does not reflect insufficient vesicle supply, but appears to be the result of slow clearance of vesicular components from the release site. Our findings uncover an important yet overlooked role of endocytic proteins for release site clearance in addition to their well-characterized role in endocytosis itself.
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Affiliation(s)
- Yunfeng Hua
- Department of Membrane Biophysics, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany; Department of Cellular Biophysics, Institute for Medical Physics and Biophysics, University of Münster, 48149 Münster, Germany
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Gauthier-Kemper A, Rajappa R, Wiemhöfer M, Thiel CS, Hüve J, Klingauf J. Syp1 Acts as a Clearance Factor for Syb2 at the Presynapse. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.3479] [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: 11/27/2022] Open
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Reinhardt P, Schmid B, Burbulla LF, Schöndorf DC, Wagner L, Glatza M, Höing S, Hargus G, Heck SA, Dhingra A, Wu G, Müller S, Brockmann K, Kluba T, Maisel M, Krüger R, Berg D, Tsytsyura Y, Thiel CS, Psathaki OE, Klingauf J, Kuhlmann T, Klewin M, Müller H, Gasser T, Schöler HR, Sterneckert J. Genetic correction of a LRRK2 mutation in human iPSCs links parkinsonian neurodegeneration to ERK-dependent changes in gene expression. Cell Stem Cell 2013; 12:354-67. [PMID: 23472874 DOI: 10.1016/j.stem.2013.01.008] [Citation(s) in RCA: 381] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Revised: 12/06/2012] [Accepted: 01/11/2013] [Indexed: 02/07/2023]
Abstract
The LRRK2 mutation G2019S is the most common genetic cause of Parkinson's disease (PD). To better understand the link between mutant LRRK2 and PD pathology, we derived induced pluripotent stem cells from PD patients harboring LRRK2 G2019S and then specifically corrected the mutant LRRK2 allele. We demonstrate that gene correction resulted in phenotypic rescue in differentiated neurons and uncovered expression changes associated with LRRK2 G2019S. We found that LRRK2 G2019S induced dysregulation of CPNE8, MAP7, UHRF2, ANXA1, and CADPS2. Knockdown experiments demonstrated that four of these genes contribute to dopaminergic neurodegeneration. LRRK2 G2019S induced increased extracellular-signal-regulated kinase 1/2 (ERK) phosphorylation. Transcriptional dysregulation of CADPS2, CPNE8, and UHRF2 was dependent on ERK activity. We show that multiple PD-associated phenotypes were ameliorated by inhibition of ERK. Therefore, our results provide mechanistic insight into the pathogenesis induced by mutant LRRK2 and pointers for the development of potential new therapeutics.
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Affiliation(s)
- Peter Reinhardt
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Röntgenstrasse 20, 48149 Münster, Germany
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47
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Hensel M, Klingauf J, Piehler J. Imaging the invisible: resolving cellular microcompartments by superresolution microscopy techniques. Biol Chem 2013; 394:1097-113. [DOI: 10.1515/hsz-2012-0324] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 04/18/2013] [Indexed: 12/20/2022]
Abstract
Abstract
Unraveling the spatio-temporal organization of dynamic cellular microcompartments requires live cell imaging techniques capable of resolving submicroscopic structures. While the resolution of traditional far-field fluorescence imaging techniques is limited by the diffraction barrier, several fluorescence-based microscopy techniques providing sub-100 nm resolution have become available during the past decade. Here, we briefly introduce the optical principles of these techniques and compare their capabilities and limitations with respect to spatial and temporal resolution as well as live cell capabilities. Moreover, we summarize how these techniques contributed to a better understanding of plasma membrane microdomains, the dynamic nanoscale organization of neuronal synapses and the sub-compartmentation of microorganisms. Based on these applications, we highlight complementarity of these techniques and their potential to address specific challenges in the context of dynamic cellular microcompartments, as well as the perspectives to overcome current limitations of these methods.
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Hoerr V, Tuchscherr L, Hüve J, Nippe N, Loser K, Glyvuk N, Tsytsyura Y, Holtkamp M, Sunderkötter C, Karst U, Klingauf J, Peters G, Löffler B, Faber C. Bacteria tracking by in vivo magnetic resonance imaging. BMC Biol 2013; 11:63. [PMID: 23714179 PMCID: PMC3686665 DOI: 10.1186/1741-7007-11-63] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Accepted: 05/22/2013] [Indexed: 02/03/2023] Open
Abstract
Background Different non-invasive real-time imaging techniques have been developed over the last decades to study bacterial pathogenic mechanisms in mouse models by following infections over a time course. In vivo investigations of bacterial infections previously relied mostly on bioluminescence imaging (BLI), which is able to localize metabolically active bacteria, but provides no data on the status of the involved organs in the infected host organism. In this study we established an in vivo imaging platform by magnetic resonance imaging (MRI) for tracking bacteria in mouse models of infection to study infection biology of clinically relevant bacteria. Results We have developed a method to label Gram-positive and Gram-negative bacteria with iron oxide nano particles and detected and pursued these with MRI. The key step for successful labeling was to manipulate the bacterial surface charge by producing electro-competent cells enabling charge interactions between the iron particles and the cell wall. Different particle sizes and coatings were tested for their ability to attach to the cell wall and possible labeling mechanisms were elaborated by comparing Gram-positive and -negative bacterial characteristics. With 5-nm citrate-coated particles an iron load of 0.015 ± 0.002 pg Fe/bacterial cell was achieved for Staphylococcus aureus. In both a subcutaneous and a systemic infection model induced by iron-labeled S. aureus bacteria, high resolution MR images allowed for bacterial tracking and provided information on the morphology of organs and the inflammatory response. Conclusion Labeled with iron oxide particles, in vivo detection of small S. aureus colonies in infection models is feasible by MRI and provides a versatile tool to follow bacterial infections in vivo. The established cell labeling strategy can easily be transferred to other bacterial species and thus provides a conceptual advance in the field of molecular MRI.
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Affiliation(s)
- Verena Hoerr
- Department of Clinical Radiology, University Hospital Münster, Münster 48149, Germany
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Li Z, Hüve J, Krampe C, Luppi G, Tsotsalas M, Klingauf J, De Cola L, Riehemann K. Internalization pathways of anisotropic disc-shaped zeolite L nanocrystals with different surface properties in HeLa cancer cells. Small 2013; 9:1809-1820. [PMID: 23335435 DOI: 10.1002/smll.201201702] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 09/03/2012] [Indexed: 06/01/2023]
Abstract
Information about the mechanisms underlying the interactions of nanoparticles with living cells is crucial for their medical application and also provides indications of the putative toxicity of such materials. Here the uptake and intracellular delivery of disc-shaped zeolite L nanocrystals as porous aminosilicates with well-defined crystal structure, uncoated as well as with COOH-, NH2 -, polyethyleneglycol (PEG)- and polyallylamine hydrochloride (PAH) surface coatings are reported. HeLa cells are used as a model system to demonstrate the relation between these particles and cancer cells. Interactions are studied in terms of their fates under diverse in vitro cell culture conditions. Differently charged coatings demonstrated dissimilar behavior in terms of agglomeration in media, serum protein adsorption, nanoparticle cytotoxicity and cell internalization. It is also found that functionalized disc-shaped zeolite L particles enter the cancer cells via different, partly not yet characterized, pathways. These in vitro results provide additional insight about low-aspect ratio anisotropic nanoparticle interactions with cancer cells and demonstrate the possibility to manipulate the interactions of nanoparticles and cells by surface coating for the use of nanoparticles in medical applications.
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Affiliation(s)
- Zhen Li
- Center for Nanotechnology (CeNTech), Heisenbergstr. 11, 48149 Muenster, Germany
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50
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Reinhardt P, Glatza M, Hemmer K, Tsytsyura Y, Thiel CS, Höing S, Moritz S, Parga JA, Wagner L, Bruder JM, Wu G, Schmid B, Röpke A, Klingauf J, Schwamborn JC, Gasser T, Schöler HR, Sterneckert J. Derivation and expansion using only small molecules of human neural progenitors for neurodegenerative disease modeling. PLoS One 2013; 8:e59252. [PMID: 23533608 PMCID: PMC3606479 DOI: 10.1371/journal.pone.0059252] [Citation(s) in RCA: 255] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Accepted: 02/12/2013] [Indexed: 11/18/2022] Open
Abstract
Phenotypic drug discovery requires billions of cells for high-throughput screening (HTS) campaigns. Because up to several million different small molecules will be tested in a single HTS campaign, even small variability within the cell populations for screening could easily invalidate an entire campaign. Neurodegenerative assays are particularly challenging because neurons are post-mitotic and cannot be expanded for implementation in HTS. Therefore, HTS for neuroprotective compounds requires a cell type that is robustly expandable and able to differentiate into all of the neuronal subtypes involved in disease pathogenesis. Here, we report the derivation and propagation using only small molecules of human neural progenitor cells (small molecule neural precursor cells; smNPCs). smNPCs are robust, exhibit immortal expansion, and do not require cumbersome manual culture and selection steps. We demonstrate that smNPCs have the potential to clonally and efficiently differentiate into neural tube lineages, including motor neurons (MNs) and midbrain dopaminergic neurons (mDANs) as well as neural crest lineages, including peripheral neurons and mesenchymal cells. These properties are so far only matched by pluripotent stem cells. Finally, to demonstrate the usefulness of smNPCs we show that mDANs differentiated from smNPCs with LRRK2 G2019S are more susceptible to apoptosis in the presence of oxidative stress compared to wild-type. Therefore, smNPCs are a powerful biological tool with properties that are optimal for large-scale disease modeling, phenotypic screening, and studies of early human development.
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Affiliation(s)
- Peter Reinhardt
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
| | - Michael Glatza
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
| | - Kathrin Hemmer
- Stem Cell Biology and Regeneration Group, Institute of Cell Biology, Center for Molecular Biology of Inflammation, Westfälische Wilhelms-Universität Münster, Münster, North Rhine-Westphalia, Germany
| | - Yaroslav Tsytsyura
- Westfälische Wilhelms-Universität Münster, Institute for Medical Physics and Biophysics, Cellular Biophysics Group, Münster, North Rhine-Westphalia, Germany
| | - Cora S. Thiel
- Westfälische Wilhelms-Universität Münster, Institute for Medical Physics and Biophysics, Cellular Biophysics Group, Münster, North Rhine-Westphalia, Germany
| | - Susanne Höing
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
| | - Sören Moritz
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
| | - Juan A. Parga
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
- Center for Research in Molecular Medicine and Chronic Diseases at the University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Lydia Wagner
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
| | - Jan M. Bruder
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
| | - Guangming Wu
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
| | - Benjamin Schmid
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, University of Tübingen, and German Center for Neurodegenerative Diseases, Tübingen, Baden-Württemburg, Germany
| | - Albrecht Röpke
- Institute for Human Genetics, University of Münster, Münster, North Rhine Westphalia, Germany
| | - Jürgen Klingauf
- Westfälische Wilhelms-Universität Münster, Institute for Medical Physics and Biophysics, Cellular Biophysics Group, Münster, North Rhine-Westphalia, Germany
| | - Jens C. Schwamborn
- Stem Cell Biology and Regeneration Group, Institute of Cell Biology, Center for Molecular Biology of Inflammation, Westfälische Wilhelms-Universität Münster, Münster, North Rhine-Westphalia, Germany
| | - Thomas Gasser
- Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, University of Tübingen, and German Center for Neurodegenerative Diseases, Tübingen, Baden-Württemburg, Germany
| | - Hans R. Schöler
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
- Medical Faculty, University of Münster, Münster, North Rhine-Westphalia, Germany
- * E-mail: (HRS); (JS)
| | - Jared Sterneckert
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, North Rhine Westphalia, Germany
- * E-mail: (HRS); (JS)
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