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Liu X, Mazel A, Marschner S, Fu Z, Muth M, Kirschhöfer F, Brenner-Weiss G, Bräse S, Diring S, Odobel F, Haldar R, Wöll C. Photoinduced Delamination of Metal-Organic Framework Thin Films by Spatioselective Generation of Reactive Oxygen Species. ACS Appl Mater Interfaces 2021; 13:57768-57773. [PMID: 34808056 DOI: 10.1021/acsami.1c16173] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Metal-organic frameworks (MOFs) built from different building units offer functionalities going far beyond gas storage and separation. In connection with advanced applications, e.g., in optoelectronics, hierarchical MOF-on-MOF structures fabricated using sophisticated methodologies have recently become particularly attractive. Here, we demonstrate that the structural complexity of MOF-based architectures can be further increased by employing highly spatioselective photochemistry. Using a layer-by-layer, quasi-epitaxial synthesis method, we realized a photoactive MOF-on-MOF hetero-bilayer consisting of a porphyrinic bottom layer and a tetraphenylethylene (TPE)-based top layer. Illumination of the monolithic thin film with visible light in the presence of oxygen gas results in the generation of reactive oxygen species (1O2) in the porphyrinic bottom layer, which lead to a photocleavage of the TPE units at the internal interface. We demonstrate that this spatioselective photochemistry can be utilized to delaminate the top layers, yielding two-dimensional (2D) MOF sheets with well-defined thickness. Experiments using atomic force microscopy (AFM) demonstrate that these platelets can be transferred onto other substrates, thus opening up the possibility of fabricating planar MOF structures using photolithography.
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Affiliation(s)
- Xiaojing Liu
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Antoine Mazel
- Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
| | - Stefan Marschner
- Karlsruhe Institute of Technology (KIT), Institute of Organic Chemistry (IOC), Fritz-Haber Weg 6, 76131 Karlsruhe, Germany
| | - Zhihua Fu
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Marius Muth
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Frank Kirschhöfer
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Gerald Brenner-Weiss
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Stefan Bräse
- Karlsruhe Institute of Technology (KIT), Institute of Organic Chemistry (IOC), Fritz-Haber Weg 6, 76131 Karlsruhe, Germany
- Karlsruhe Institute of Technology (KIT), Institute of Biological and Chemical Systems (IBCS-FMS), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Stéphane Diring
- Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
| | - Fabrice Odobel
- Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
| | - Ritesh Haldar
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| | - Christof Wöll
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz Platz-1, 76344 Eggenstein-Leopoldshafen, Germany
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Melzak KA, Spouge JL, Boecker C, Kirschhöfer F, Brenner-Weiss G, Bieback K. Hemolysis Pathways during Storage of Erythrocytes and Inter-Donor Variability in Erythrocyte Morphology. Transfus Med Hemother 2021; 48:39-47. [PMID: 33708051 DOI: 10.1159/000508711] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 05/03/2020] [Indexed: 01/10/2023] Open
Abstract
Background Red blood cells (RBCs) stored for transfusions can lyse over the course of the storage period. The lysis is traditionally assumed to occur via the formation of spiculated echinocyte forms, so that cells that appear smoother are assumed to have better storage quality. We investigate this hypothesis by comparing the morphological distribution to the hemolysis for samples from different donors. Methods Red cell concentrates were obtained from a regional blood bank quality control laboratory. Out of 636 units processed by the laboratory, we obtained 26 high hemolysis units and 24 low hemolysis units for assessment of RBC morphology. The association between the morphology and the hemolysis was tested with the Wilcoxon-Mann-Whitney U test. Results Samples with high stomatocyte counts (p = 0.0012) were associated with increased hemolysis, implying that cells can lyse via the formation of stomatocytes. Conclusion RBCs can lyse without significant echinocyte formation. Lower degrees of spiculation are not a good indicator of low hemolysis when RBCs from different donors are compared.
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Affiliation(s)
- Kathryn A Melzak
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - John L Spouge
- National Center for Biotechnology Information, National Institutes of Health USA, Bethesda, Maryland, USA
| | - Clemens Boecker
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Frank Kirschhöfer
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Karen Bieback
- Institute for Transfusion Medicine and Immunology, Flowcore Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
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Sen B, Santos JCC, Haldar R, Zhang Q, Hashem T, Qin P, Li Y, Kirschhöfer F, Brenner-Weiss G, Gliemann H, Heinke L, Barner-Kowollik C, Knebel A, Wöll C. Introducing electrical conductivity to metal-organic framework thin films by templated polymerization of methyl propiolate. Nanoscale 2020; 12:24419-24428. [PMID: 33300536 DOI: 10.1039/d0nr06848a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We herein present a case study on the templated, Pd-catalyzed polymerization reaction of methyl propiolate in the confined pore space of three different surface anchored metal-organic framework (SURMOF) systems in order to introduce electrical conductivity to MOF thin films and provide predictions for potential device integrations. To gain comprehensive insight into the influence of the template on polymerization, we chose Cu(bpdc), Cu2(bdc)2(dabco) and HKUST-1 because of their different types of pore channels, 1D, quasi-1D and 3D, and their free pore volumes. Well-defined MOF thin films were prepared using layer-by-layer deposition, which allows for the application of several characterization techniques not applicable for conventional powder MOFs. With SEM, AFM, XRD, MALDI-ToF/MS, ToF-SIMS and QCM, we were able to investigate the behaviour of the polymer formation. For lower dimensional pore channels, we find a depot-like release of monomeric units leading to top-layer formation determined by desorption kinetics, whereas for the 3D channels, quick release of an excess amount of monomers was observed and polymerization proceeds perfectly. Despite polymerization issues, control over the maximum chain lengths and the molecular weight distribution was achieved depending on the dimensionality of the pore systems. For the HKUST-1 system, polymerization was optimized and we were able to measure the electrical conductivity introduced by the conjugated polymer inside the channels.
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Affiliation(s)
- Beren Sen
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
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Bouffartigues E, Si Hadj Mohand I, Maillot O, Tortuel D, Omnes J, David A, Tahrioui A, Duchesne R, Azuama CO, Nusser M, Brenner-Weiss G, Bazire A, Connil N, Orange N, Feuilloley MGJ, Lesouhaitier O, Dufour A, Cornelis P, Chevalier S. The Temperature-Regulation of Pseudomonas aeruginosa cmaX-cfrX-cmpX Operon Reveals an Intriguing Molecular Network Involving the Sigma Factors AlgU and SigX. Front Microbiol 2020; 11:579495. [PMID: 33193206 PMCID: PMC7641640 DOI: 10.3389/fmicb.2020.579495] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 07/02/2020] [Accepted: 09/23/2020] [Indexed: 11/13/2022] Open
Abstract
Pseudomonas aeruginosa is a highly adaptable Gram-negative opportunistic pathogen, notably due to its large number of transcription regulators. The extracytoplasmic sigma factor (ECFσ) AlgU, responsible for alginate biosynthesis, is also involved in responses to cell wall stress and heat shock via the RpoH alternative σ factor. The SigX ECFσ emerged as a major regulator involved in the envelope stress response via membrane remodeling, virulence and biofilm formation. However, their functional interactions to coordinate the envelope homeostasis in response to environmental variations remain to be determined. The regulation of the putative cmaX-cfrX-cmpX operon located directly upstream sigX was investigated by applying sudden temperature shifts from 37°C. We identified a SigX- and an AlgU- dependent promoter region upstream of cfrX and cmaX, respectively. We show that cmaX expression is increased upon heat shock through an AlgU-dependent but RpoH independent mechanism. In addition, the ECFσ SigX is activated in response to valinomycin, an agent altering the membrane structure, and up-regulates cfrX-cmpX transcription in response to cold shock. Altogether, these data provide new insights into the regulation exerted by SigX and networks that are involved in maintaining envelope homeostasis.
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Affiliation(s)
- Emeline Bouffartigues
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Ishac Si Hadj Mohand
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Olivier Maillot
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Damien Tortuel
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Jordane Omnes
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Audrey David
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Ali Tahrioui
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Rachel Duchesne
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Cecil Onyedikachi Azuama
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Michael Nusser
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Alexis Bazire
- Laboratoire de Biotechnologie et Chimie Marines (LBCM) EA3884, IUEM, Université de Bretagne-Sud, Lorient, France
| | - Nathalie Connil
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Nicole Orange
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Marc G J Feuilloley
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Olivier Lesouhaitier
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Alain Dufour
- Laboratoire de Biotechnologie et Chimie Marines (LBCM) EA3884, IUEM, Université de Bretagne-Sud, Lorient, France
| | - Pierre Cornelis
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
| | - Sylvie Chevalier
- Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM) EA 4312, Normandie Université, Université de Rouen Normandie, Centre de Sécurité Sanitaire de Normandie, Evreux, France
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Melzak KA, Muth M, Kirschhöfer F, Brenner-Weiss G, Bieback K. Lipid ratios as a marker for red blood cell storage quality and as a possible explanation for donor gender differences in storage quality. Vox Sang 2020; 115:655-663. [PMID: 32378231 DOI: 10.1111/vox.12924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 03/24/2020] [Accepted: 03/26/2020] [Indexed: 12/01/2022]
Abstract
BACKGROUND AND OBJECTIVES Red blood cells that are stored for transfusions as red cell concentrates (RCCs) undergo changes during the storage period, culminating in the lysis of the cells. The goal of this work is to find markers that are linked to high haemolysis, in order to explain the inter-donor variability that is known to occur in storage quality, and also the known differences between RCCs from male and female donors. MATERIALS AND METHODS The relative amounts of lipids at the end of the storage period were compared for one group of low haemolysis samples (24 units, all ≤0·15% haemolysis), and one group of high haemolysis samples (26 units, all ≥0·5% haemolysis). Representative lipids were analysed from different lipid classes, including cholesterol, phosphatidylcholine, phosphatidylethanolamine, sphingomyelin and ceramide. Whole membrane preparations were analysed with one mass spectrometry technique, and lipid extracts were analysed with a second mass spectrometry technique. RESULTS The ratio of palmitoyl-oleoyl phosphatidylcholine (POPC) to sphingomyelin was different for the high and low haemolysis groups (P = 0·0001) and for the RCCs from male and female donors (P = 0·0009). The ratio of cholesterol to phospholipids showed only minimal links to haemolysis. Higher relative amounts of sphingomyelin were associated with lower haemolysis, and higher relative amounts of ceramides were associated with increased haemolysis. CONCLUSION The level of sphingomyelinase activity and the resulting ratio of sphingomyelin to POPC is proposed as a possible marker for RCC storage quality.
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Affiliation(s)
- Kathryn A Melzak
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Marius Muth
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Frank Kirschhöfer
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Karen Bieback
- Institute of Transfusion Medicine and Immunology, Flowcore Mannheim, Medical Faculty Mannheim, Heidelberg University and German Red Cross Blood Donor Services Baden-Württemberg - Hessen, Mannheim, Germany
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6
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Moura-Alves P, Puyskens A, Stinn A, Klemm M, Guhlich-Bornhof U, Dorhoi A, Furkert J, Kreuchwig A, Protze J, Lozza L, Pei G, Saikali P, Perdomo C, Mollenkopf HJ, Hurwitz R, Kirschhoefer F, Brenner-Weiss G, Weiner J, Oschkinat H, Kolbe M, Krause G, Kaufmann SHE. Host monitoring of quorum sensing during Pseudomonas aeruginosa infection. Science 2020; 366:366/6472/eaaw1629. [PMID: 31857448 DOI: 10.1126/science.aaw1629] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 07/25/2019] [Accepted: 11/13/2019] [Indexed: 01/01/2023]
Abstract
Pseudomonas aeruginosa rapidly adapts to altered conditions by quorum sensing (QS), a communication system that it uses to collectively modify its behavior through the production, release, and detection of signaling molecules. QS molecules can also be sensed by hosts, although the respective receptors and signaling pathways are poorly understood. We describe a pattern of regulation in the host by the aryl hydrocarbon receptor (AhR) that is critically dependent on qualitative and quantitative sensing of P. aeruginosa quorum. QS molecules bind to AhR and distinctly modulate its activity. This is mirrored upon infection with P. aeruginosa collected from diverse growth stages and with QS mutants. We propose that by spying on bacterial quorum, AhR acts as a major sensor of infection dynamics, capable of orchestrating host defense according to the status quo of infection.
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Affiliation(s)
- Pedro Moura-Alves
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany. .,Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Andreas Puyskens
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Anne Stinn
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Structural Systems Biology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Department of Structural Infection Biology, Centre for Structural Systems Biology, Helmholtz Centre for Infection Research (HZI), 22607 Hamburg, Germany.,Faculty of Mathematics, Informatics and Natural Sciences, University of Hamburg, 20148 Hamburg, Germany
| | - Marion Klemm
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Ute Guhlich-Bornhof
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Anca Dorhoi
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Institute of Immunology, Friedrich-Loeffler Institut, Greifswald-Insel Riems, Germany.,Faculty of Mathematics and Natural Sciences, University of Greifswald, Greifswald, Germany
| | - Jens Furkert
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Annika Kreuchwig
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Jonas Protze
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Laura Lozza
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Epiontis GmbH-Precision for Medicine, 12489 Berlin, Germany
| | - Gang Pei
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Philippe Saikali
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Carolina Perdomo
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Hans J Mollenkopf
- Microarray Core Facility, Max Planck Institute for Infection Biology, Department of Immunology, 10117 Berlin, Germany
| | - Robert Hurwitz
- Protein Purification Core Facility, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Frank Kirschhoefer
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Protein Purification Core Facility, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - January Weiner
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany
| | - Hartmut Oschkinat
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Michael Kolbe
- Structural Systems Biology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany.,Department of Structural Infection Biology, Centre for Structural Systems Biology, Helmholtz Centre for Infection Research (HZI), 22607 Hamburg, Germany.,Faculty of Mathematics, Informatics and Natural Sciences, University of Hamburg, 20148 Hamburg, Germany
| | - Gerd Krause
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Stefan H E Kaufmann
- Department of Immunology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany. .,Hagler Institute for Advanced Study at Texas A&M University, College Station, TX 77843, USA
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Mohammadi Hafshejani T, Hohmann S, Nefedov A, Schwotzer M, Brenner-Weiss G, Izadifar M, Thissen P. Formation and Stability of Nontoxic Perovskite Precursor. Langmuir 2019; 35:16217-16225. [PMID: 31664843 DOI: 10.1021/acs.langmuir.9b03037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Strontium, calcium, and magnesium silicate hydrate phases are synthesized by the reaction between silica and solution of metal hydroxides. The kinetics of the reaction is recorded using a quartz crystal microbalance (QCM), continuously monitoring the change in frequency and dissipation energy. Based on QCM results, it is shown that properties of solutions like the pH-value or the type of ions play a pivotal function on the rate-determining stage of the reaction, the thickness of the diffuse layer, the formation of carbonates, as well as the kinetics of the formed phases. Further properties of the reaction products are investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and infrared spectroscopy (IR). With the help of thermogravimetric analysis (TGA) and temperature-dependent X-ray diffraction (XRD), we investigate how our synthesized phases can be turned into MSiO3 structures. Finally, the Goldschmidt rules for perovskites structures show that this might be an attractive way for new and nontoxic phases in the future.
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Affiliation(s)
- Tahereh Mohammadi Hafshejani
- Karlsruher Institut für Technologie (KIT) , Institut für Funktionelle Grenzflächen (IFG) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Siegfried Hohmann
- Karlsruher Institut für Technologie (KIT) , Institut für Funktionelle Grenzflächen (IFG) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Alexei Nefedov
- Karlsruher Institut für Technologie (KIT) , Institut für Funktionelle Grenzflächen (IFG) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Matthias Schwotzer
- Karlsruher Institut für Technologie (KIT) , Institut für Funktionelle Grenzflächen (IFG) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Gerald Brenner-Weiss
- Karlsruher Institut für Technologie (KIT) , Institut für Funktionelle Grenzflächen (IFG) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Mohammadreza Izadifar
- Karlsruher Institut für Technologie (KIT) , Institut für Funktionelle Grenzflächen (IFG) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Peter Thissen
- Karlsruher Institut für Technologie (KIT) , Institut für Funktionelle Grenzflächen (IFG) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
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8
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Melzak KA, Uhlig S, Kirschhöfer F, Brenner-Weiss G, Bieback K. The Blood Bag Plasticizer Di-2-Ethylhexylphthalate Causes Red Blood Cells to Form Stomatocytes, Possibly by Inducing Lipid Flip-Flop. Transfus Med Hemother 2018; 45:413-422. [PMID: 30574059 DOI: 10.1159/000490502] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 05/26/2018] [Indexed: 12/13/2022] Open
Abstract
Background During storage of red blood cell (RBC) concentrates, the plasticizer di-2-ethylhexylphthalate (DEHP) that keeps the blood bags soft leaches out and can be taken up by the RBCs. DEHP is known to be beneficial for the RBC storage quality, but the molecular mechanisms of the action are unknown. Methods Aqueous suspensions of DEHP were added to RBCs in buffer. The morphological effects were observed on RBCs from 5 donors. Flow cytometry with annexin A5 binding was used to measure the exposed phosphatidylserine. Results DEHP induced the formation of stomatocytes at concentrations as low as ng/ml, provided that the cell suspension was also sufficiently dilute. Some spherocytes, which were susceptible to lysis, were also formed; after lysis, RBC ghosts were seen to continue the transition to the cup-shaped stomatocyte form. Incubation with DEHP increased the exposed phosphatidylserine, an effect that was also observed in the presence of vanadate, which inhibits the ATP-dependent translocases that maintain the membrane's lipid asymmetry. Conclusions DEHP can have an active effect on RBC shape, instead of just preventing the storage-related shape changes. The effect appears to be mediated by increased flip-flop of lipids between the leaflets of the RBC membrane.
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Affiliation(s)
- Kathryn A Melzak
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Stefanie Uhlig
- Institute for Transfusion Medicine and Immunology, Flowcore Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Frank Kirschhöfer
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Karen Bieback
- Institute for Transfusion Medicine and Immunology, Flowcore Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
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9
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Helmer D, Rink I, Dalton JAR, Brahm K, Jöst M, Nargang TM, Blum W, Wadhwani P, Brenner-Weiss G, Rapp BE, Giraldo J, Schmitz K. Correction: Rational design of a peptide capture agent for CXCL8 based on a model of the CXCL8:CXCR1 complex. RSC Adv 2018; 8:16800-16801. [PMID: 35544431 PMCID: PMC9080292 DOI: 10.1039/c8ra90035c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 04/26/2018] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘Rational design of a peptide capture agent for CXCL8 based on a model of the CXCL8:CXCR1 complex’ by Dorothea Helmer et al., RSC Adv., 2015, 5, 25657–25668.
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10
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Strempel N, Nusser M, Neidig A, Brenner-Weiss G, Overhage J. The Oxidative Stress Agent Hypochlorite Stimulates c-di-GMP Synthesis and Biofilm Formation in Pseudomonas aeruginosa. Front Microbiol 2017; 8:2311. [PMID: 29213262 PMCID: PMC5702645 DOI: 10.3389/fmicb.2017.02311] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [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: 09/18/2017] [Accepted: 11/08/2017] [Indexed: 01/25/2023] Open
Abstract
The opportunistic human pathogen Pseudomonas aeruginosa is able to survive under a variety of often harmful environmental conditions due to a multitude of intrinsic and adaptive resistance mechanisms, including biofilm formation as one important survival strategy. Here, we investigated the adaptation of P. aeruginosa PAO1 to hypochlorite (HClO), a phagocyte-derived host defense compound and frequently used disinfectant. In static biofilm assays, we observed a significant enhancement in initial cell attachment in the presence of sublethal HClO concentrations. Subsequent LC-MS analyses revealed a strong increase in cyclic-di-GMP (c-di-GMP) levels suggesting a key role of this second messenger in HClO-induced biofilm development. Using DNA microarrays, we identified a 26-fold upregulation of ORF PA3177 coding for a putative diguanylate cyclase (DGC), which catalyzes the synthesis of the second messenger c-di-GMP – an important regulator of bacterial motility, sessility and persistence. This DGC PA3177 was further characterized in more detail demonstrating its impact on P. aeruginosa motility and biofilm formation. In addition, cell culture assays attested a role for PA3177 in the response of P. aeruginosa to human phagocytes. Using a subset of different mutants, we were able to show that both Pel and Psl exopolysaccharides are effectors in the PA3177-dependent c-di-GMP network.
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Affiliation(s)
- Nikola Strempel
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Michael Nusser
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Anke Neidig
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Joerg Overhage
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Karlsruhe, Germany.,Department of Health Sciences, Carleton University, Ottawa, ON, Canada
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11
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Gözke G, Kirschhöfer F, Prechtl C, Brenner-Weiss G, Krumov NV, Obst U, Posten C. Electrofiltration improves dead-end filtration of hyaluronic acid and presents an alternative downstream processing step that overcomes technological challenges of conventional methods. Eng Life Sci 2017; 17:970-975. [PMID: 32624846 DOI: 10.1002/elsc.201600236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 02/16/2017] [Accepted: 03/09/2017] [Indexed: 11/09/2022] Open
Abstract
Hyaluronic acid (HA) dispersion obtained from the bacteria Streptococcus equi was concentrated by electrofiltration. In the conventional downstream processing of HA, extraction and precipitation lead to increase in environmental issues, structural changes, and time and energy related costs. Using electrofiltration as an alternative technology delivers solutions to these limitations. Experiments were conducted in order to test the applicability of electrofiltration to downstream processing of the negatively charged HA. The structural changes and molecular weight distributions, often a consequence of the employed separation method, were tested by analysis of the initial dispersions and final products. In comparison to the conventional filtration, concentration factors were increased up to almost four times without any detectable structural change in the final product.
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Affiliation(s)
- Gözde Gözke
- Department of Chemical and Process Engineering Faculty of Engineering Yalova University Yalova Turkey
| | - Frank Kirschhöfer
- Institute of Functional Interfaces Karlsruhe Institute of Technology Leopoldshafen Germany
| | | | - Gerald Brenner-Weiss
- Institute of Functional Interfaces Karlsruhe Institute of Technology Leopoldshafen Germany
| | | | - Ursula Obst
- Institute of Functional Interfaces Karlsruhe Institute of Technology Leopoldshafen Germany
| | - Clemens Posten
- Institute of Process Engineering in Life Sciences Bioprocess Engineering Karlsruhe Institute of Technology Karlsruhe Germany
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12
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Tettmann B, Niewerth C, Kirschhöfer F, Neidig A, Dötsch A, Brenner-Weiss G, Fetzner S, Overhage J. Enzyme-Mediated Quenching of the Pseudomonas Quinolone Signal (PQS) Promotes Biofilm Formation of Pseudomonas aeruginosa by Increasing Iron Availability. Front Microbiol 2016; 7:1978. [PMID: 28018312 PMCID: PMC5145850 DOI: 10.3389/fmicb.2016.01978] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 07/21/2016] [Accepted: 11/25/2016] [Indexed: 11/24/2022] Open
Abstract
The 2-alkyl-3-hydroxy-4(1H)-quinolone 2,4-dioxygenase HodC was previously described to cleave the Pseudomonas quinolone signal, PQS, which is exclusively used in the complex quorum sensing (QS) system of Pseudomonas aeruginosa, an opportunistic pathogen employing QS to regulate virulence and biofilm development. Degradation of PQS by exogenous addition of HodC to planktonic cells of P. aeruginosa attenuated production of virulence factors, and reduced virulence in planta. However, proteolytic cleavage reduced the efficacy of HodC. Here, we identified the secreted protease LasB of P. aeruginosa to be responsible for HodC degradation. In static biofilms of the P. aeruginosa PA14 lasB::Tn mutant, the catalytic activity of HodC led to an increase in viable biomass in newly formed but also in established biofilms, and reduced the expression of genes involved in iron metabolism and siderophore production, such as pvdS, pvdL, pvdA, and pvdQ. This is likely due to an increase in the levels of bioavailable iron by degradation of PQS, which is able to sequester iron from the surrounding environment. Thus, HodC, despite its ability to quench the production of virulence factors, is contraindicated for combating P. aeruginosa biofilms.
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Affiliation(s)
- Beatrix Tettmann
- Karlsruhe Institute of Technology, Institute of Functional Interfaces Karlsruhe, Germany
| | - Christine Niewerth
- Institute for Molecular Microbiology and Biotechnology, University of Münster Münster, Germany
| | - Frank Kirschhöfer
- Karlsruhe Institute of Technology, Institute of Functional Interfaces Karlsruhe, Germany
| | - Anke Neidig
- Karlsruhe Institute of Technology, Institute of Functional Interfaces Karlsruhe, Germany
| | - Andreas Dötsch
- Karlsruhe Institute of Technology, Institute of Functional Interfaces Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Karlsruhe Institute of Technology, Institute of Functional Interfaces Karlsruhe, Germany
| | - Susanne Fetzner
- Institute for Molecular Microbiology and Biotechnology, University of Münster Münster, Germany
| | - Joerg Overhage
- Karlsruhe Institute of Technology, Institute of Functional Interfaces Karlsruhe, Germany
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13
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Siebenhaller S, Muhle-Goll C, Luy B, Kirschhöfer F, Brenner-Weiss G, Hiller E, Günther M, Rupp S, Zibek S, Syldatk C. Sustainable enzymatic synthesis of glycolipids in a deep eutectic solvent system. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2017.01.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Kondakova T, Catovic C, Barreau M, Nusser M, Brenner-Weiss G, Chevalier S, Dionnet F, Orange N, Poc CD. Response to Gaseous NO2 Air Pollutant of P. fluorescens Airborne Strain MFAF76a and Clinical Strain MFN1032. Front Microbiol 2016; 7:379. [PMID: 27065229 PMCID: PMC4814523 DOI: 10.3389/fmicb.2016.00379] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 11/08/2015] [Accepted: 03/09/2016] [Indexed: 01/22/2023] Open
Abstract
Human exposure to nitrogen dioxide (NO2), an air pollutant of increasing interest in biology, results in several toxic effects to human health and also to the air microbiota. The aim of this study was to investigate the bacterial response to gaseous NO2. Two Pseudomonas fluorescens strains, namely the airborne strain MFAF76a and the clinical strain MFN1032 were exposed to 0.1, 5, or 45 ppm concentrations of NO2, and their effects on bacteria were evaluated in terms of motility, biofilm formation, antibiotic resistance, as well as expression of several chosen target genes. While 0.1 and 5 ppm of NO2did not lead to any detectable modification in the studied phenotypes of the two bacteria, several alterations were observed when the bacteria were exposed to 45 ppm of gaseous NO2. We thus chose to focus on this high concentration. NO2-exposed P. fluorescens strains showed reduced swimming motility, and decreased swarming in case of the strain MFN1032. Biofilm formed by NO2-treated airborne strain MFAF76a showed increased maximum thickness compared to non-treated cells, while NO2 had no apparent effect on the clinical MFN1032 biofilm structure. It is well known that biofilm and motility are inversely regulated by intracellular c-di-GMP level. The c-di-GMP level was however not affected in response to NO2 treatment. Finally, NO2-exposed P. fluorescens strains were found to be more resistant to ciprofloxacin and chloramphenicol. Accordingly, the resistance nodulation cell division (RND) MexEF-OprN efflux pump encoding genes were highly upregulated in the two P. fluorescens strains. Noticeably, similar phenotypes had been previously observed following a NO treatment. Interestingly, an hmp-homolog gene in P. fluorescens strains MFAF76a and MFN1032 encodes a NO dioxygenase that is involved in NO detoxification into nitrites. Its expression was upregulated in response to NO2, suggesting a possible common pathway between NO and NO2 detoxification. Taken together, our study provides evidences for the bacterial response to NO2 toxicity.
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Affiliation(s)
- Tatiana Kondakova
- Laboratory of Microbiology Signals and Microenvironment EA 4312, Normandy University, University of Rouen, SéSa, IRIBEvreux, France; Aerothermic and Internal Combustion Engine Technological Research CentreSaint Etienne du Rouvray, France
| | - Chloé Catovic
- Laboratory of Microbiology Signals and Microenvironment EA 4312, Normandy University, University of Rouen, SéSa, IRIB Evreux, France
| | - Magalie Barreau
- Laboratory of Microbiology Signals and Microenvironment EA 4312, Normandy University, University of Rouen, SéSa, IRIB Evreux, France
| | - Michael Nusser
- Institute of Functional Interfaces, Karlsruhe Institute of Technology Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces, Karlsruhe Institute of Technology Karlsruhe, Germany
| | - Sylvie Chevalier
- Laboratory of Microbiology Signals and Microenvironment EA 4312, Normandy University, University of Rouen, SéSa, IRIB Evreux, France
| | - Frédéric Dionnet
- Aerothermic and Internal Combustion Engine Technological Research Centre Saint Etienne du Rouvray, France
| | - Nicole Orange
- Laboratory of Microbiology Signals and Microenvironment EA 4312, Normandy University, University of Rouen, SéSa, IRIB Evreux, France
| | - Cécile Duclairoir Poc
- Laboratory of Microbiology Signals and Microenvironment EA 4312, Normandy University, University of Rouen, SéSa, IRIB Evreux, France
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15
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Kirschhöfer F, Sahin O, Becker GC, Meffert F, Nusser M, Anderer G, Kusche S, Klaeusli T, Kruse A, Brenner-Weiss G. Wastewater treatment--adsorption of organic micropollutants on activated HTC-carbon derived from sewage sludge. Water Sci Technol 2016; 73:607-616. [PMID: 26877044 DOI: 10.2166/wst.2015.511] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Organic micropollutants (MPs), in particular xenobiotics and their transformation products, have been detected in the aquatic environment and the main sources of these MPs are wastewater treatment plants. Therefore, an additional cleaning step is necessary. The use of activated carbon (AC) is one approach to providing this additional cleaning. Industrial AC derived from different carbonaceous materials is predominantly produced in low-income countries by polluting processes. In contrast, AC derived from sewage sludge by hydrothermal carbonization (HTC) is a regional and sustainable alternative, based on waste material. Our experiments demonstrate that the HTC-AC from sewage sludge was able to remove most of the applied MPs. In fact more than 50% of sulfamethoxazole, diclofenac and bezafibrate were removed from artificial water samples. With the same approach carbamazepine was eliminated to nearly 70% and atrazine more than 80%. In addition a pre-treated (phosphorus-reduced) HTC-AC was able to eliminate 80% of carbamazepine and diclofenac. Atrazine, sulfamethoxazole and bezafibrate were removed to more than 90%. Experiments using real wastewater samples with high organic content (11.1 g m(-3)) succeeded in proving the adsorption capability of phosphorus-reduced HTC-AC.
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Affiliation(s)
- Frank Kirschhöfer
- * Karlsruhe Institute of Technology (KIT), IFG, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany E-mail:
| | - Olga Sahin
- * Karlsruhe Institute of Technology (KIT), IKFT, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Gero C Becker
- * University of Hohenheim, Institute of Agricultural Engineering, Garbenstr. 9, D-70593 Stuttgart, Germany *These authors contributed equally to this work
| | - Florian Meffert
- * Karlsruhe Institute of Technology (KIT), IKFT, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Michael Nusser
- * Karlsruhe Institute of Technology (KIT), IFG, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany E-mail:
| | - Gilbert Anderer
- AndererConsulting, Rheinstr. 16a, D-76337 Waldbronn, Germany
| | - Stepan Kusche
- AVA-CO2 Forschung GmbH, Im Schlehert 14, D-76187 Karlsruhe, Germany
| | - Thomas Klaeusli
- AVA-CO2 Schweiz AG, Baarerstrasse, 20, CH-6304 Zug, Switzerland
| | - Andrea Kruse
- * University of Hohenheim, Institute of Agricultural Engineering, Garbenstr. 9, D-70593 Stuttgart, Germany *These authors contributed equally to this work
| | - Gerald Brenner-Weiss
- * Karlsruhe Institute of Technology (KIT), IFG, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany E-mail:
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16
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Kügler JH, Muhle-Goll C, Hansen SH, Völp AR, Kirschhöfer F, Kühl B, Brenner-Weiss G, Luy B, Syldatk C, Hausmann R. Glycolipids produced by Rouxiella sp. DSM 100043 and isolation of the biosurfactants via foam-fractionation. AMB Express 2015; 5:82. [PMID: 26698314 PMCID: PMC4689721 DOI: 10.1186/s13568-015-0167-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 12/11/2015] [Indexed: 11/10/2022] Open
Abstract
Microorganisms produce a great variety of secondary metabolites that feature surface active and bioactive properties. Those possessing an amphiphilc molecular structure are also termed biosurfactant and are of great interest due to their often unique properties. Rouxiella sp. DSM 100043 is a gram negative enterobacter isolated from peat-bog soil and described as a new biosurfactant producing species in this study. Rouxiella sp. produces glycolipids, biosurfactants with a carbohydrate moiety in its structure. This study characterizes the composition of glycolipids with different hydrophobicities that have been produced during cultivation in a bioreactor and been extracted and purified from separated foam. Using two dimensional nuclear magnetic resonance spectroscopy, the hydrophilic moieties are elucidated as glucose with various acylation sites and as talose within the most polar glycolipids. The presence of 3′ hydroxy lauroleic acid as well as myristic and myristoleic acid has been detected.
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17
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Bouffartigues E, Moscoso JA, Duchesne R, Rosay T, Fito-Boncompte L, Gicquel G, Maillot O, Bénard M, Bazire A, Brenner-Weiss G, Lesouhaitier O, Lerouge P, Dufour A, Orange N, Feuilloley MGJ, Overhage J, Filloux A, Chevalier S. The absence of the Pseudomonas aeruginosa OprF protein leads to increased biofilm formation through variation in c-di-GMP level. Front Microbiol 2015; 6:630. [PMID: 26157434 PMCID: PMC4477172 DOI: 10.3389/fmicb.2015.00630] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 06/09/2015] [Indexed: 11/13/2022] Open
Abstract
OprF is the major outer membrane porin in bacteria belonging to the Pseudomonas genus. In previous studies, we have shown that OprF is required for full virulence expression of the opportunistic pathogen Pseudomonas aeruginosa. Here, we describe molecular insights on the nature of this relationship and report that the absence of OprF leads to increased biofilm formation and production of the Pel exopolysaccharide. Accordingly, the level of c-di-GMP, a key second messenger in biofilm control, is elevated in an oprF mutant. By decreasing c-di-GMP levels in this mutant, both biofilm formation and pel gene expression phenotypes were restored to wild-type levels. We further investigated the impact on two small RNAs, which are associated with the biofilm lifestyle, and found that expression of rsmZ but not of rsmY was increased in the oprF mutant and this occurs in a c-di-GMP-dependent manner. Finally, the extracytoplasmic function (ECF) sigma factors AlgU and SigX displayed higher activity levels in the oprF mutant. Two genes of the SigX regulon involved in c-di-GMP metabolism, PA1181 and adcA (PA4843), were up-regulated in the oprF mutant, partly explaining the increased c-di-GMP level. We hypothesized that the absence of OprF leads to a cell envelope stress that activates SigX and results in a c-di-GMP elevated level due to higher expression of adcA and PA1181. The c-di-GMP level can in turn stimulate Pel synthesis via increased rsmZ sRNA levels and pel mRNA, thus affecting Pel-dependent phenotypes such as cell aggregation and biofilm formation. This work highlights the connection between OprF and c-di-GMP regulatory networks, likely via SigX (ECF), on the regulation of biofilm phenotypes.
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Affiliation(s)
- Emeline Bouffartigues
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Joana A Moscoso
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London London, UK
| | - Rachel Duchesne
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Thibaut Rosay
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Laurène Fito-Boncompte
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Gwendoline Gicquel
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Olivier Maillot
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Magalie Bénard
- Cell Imaging Platform of Normandy (PRIMACEN), Institute for Research and Innovation in Biomedicine, University of Rouen Mont-Saint-Aignan, France
| | - Alexis Bazire
- EA 3884-Laboratoire de Biotechnologie et Chimie Marines, Institut Universitaire Européen de la Mer, Université de Bretagne-Sud Lorient, France
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces, Karlsruhe Institute of Technology Karlsruhe, Germany
| | - Olivier Lesouhaitier
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Patrice Lerouge
- Glyco-MeV Laboratory, University of Rouen, Normandy University Mont-Saint-Aignan, France
| | - Alain Dufour
- EA 3884-Laboratoire de Biotechnologie et Chimie Marines, Institut Universitaire Européen de la Mer, Université de Bretagne-Sud Lorient, France
| | - Nicole Orange
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Marc G J Feuilloley
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
| | - Joerg Overhage
- Institute of Functional Interfaces, Karlsruhe Institute of Technology Karlsruhe, Germany
| | - Alain Filloux
- MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London London, UK
| | - Sylvie Chevalier
- EA 4312-Laboratory of Microbiology Signals and Microenvironment, University of Rouen - Normandy University Evreux, France
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18
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Yan H, Solozobova V, Zhang P, Armant O, Kuehl B, Brenner-Weiss G, Blattner C. p53 is active in murine stem cells and alters the transcriptome in a manner that is reminiscent of mutant p53. Cell Death Dis 2015; 6:e1662. [PMID: 25719246 PMCID: PMC4669809 DOI: 10.1038/cddis.2015.33] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 12/15/2014] [Accepted: 01/15/2015] [Indexed: 12/30/2022]
Abstract
Since it was found that p53 is highly expressed in murine embryonic stem cells, it remained a mystery whether p53 is active in this cell type. We show that a significant part of p53 is localised in the nucleus of murine embryonic stem cells and that the majority of this nuclear p53 is bound to DNA. According to its nuclear localisation, we show that p53 alters the transcriptional program of stem cells. Nevertheless, the anti-proliferative activity of p53 is compromised in stem cells, and this control is due, at least in part, to the high amount of MdmX that is present in embryonic stem cells and bound to p53. Instead of the anti-proliferative activity that p53 has in differentiated cells, p53 controls transcription of pro-proliferative genes in embryonic stem cells including c-myc and c-jun. The impeded anti-proliferative activity of p53 and the induction of certain proto-oncogenes by p53 in murine embryonic stem cells can explain why stem cells proliferate efficiently despite having high levels of p53.
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Affiliation(s)
- H Yan
- 1] Karlsruhe Institute of Technology, Institute of Toxicology and Genetics, Karlsruhe, Germany [2] University of Heidelberg, Heidelberg, Germany
| | - V Solozobova
- Karlsruhe Institute of Technology, Institute of Toxicology and Genetics, Karlsruhe, Germany
| | - P Zhang
- 1] Karlsruhe Institute of Technology, Institute of Toxicology and Genetics, Karlsruhe, Germany [2] University of Heidelberg, Heidelberg, Germany
| | - O Armant
- Karlsruhe Institute of Technology, Institute of Toxicology and Genetics, Karlsruhe, Germany
| | - B Kuehl
- Karlsruhe Institute of Technology, Institute of Functional Interfaces, Karlsruhe, Germany
| | - G Brenner-Weiss
- Karlsruhe Institute of Technology, Institute of Functional Interfaces, Karlsruhe, Germany
| | - C Blattner
- Karlsruhe Institute of Technology, Institute of Toxicology and Genetics, Karlsruhe, Germany
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19
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Helmer D, Rink I, Dalton JAR, Brahm K, Jöst M, Nargang TM, Blum W, Wadhwani P, Brenner-Weiss G, Rapp BE, Giraldo J, Schmitz K. Rational design of a peptide capture agent for CXCL8 based on a model of the CXCL8:CXCR1 complex. RSC Adv 2015. [DOI: 10.1039/c4ra13749c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A CXCL8-binding peptide designed from the interaction sites of CXCR1 with CXCL8 serves as a capture agent and inhibits neutrophil migration.
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20
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Andre M, Kühl B, Brenner-Weiss G, Syldatk C, Rudat J. Cationic heterooligopeptides by ficain-catalyzed co-oligomerization of lysine and methionine ethylesters. J Pept Sci 2014; 20:625-9. [DOI: 10.1002/psc.2639] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 02/25/2014] [Accepted: 03/18/2014] [Indexed: 12/21/2022]
Affiliation(s)
- Markus Andre
- Institute of Process Engineering in Life Sciences, Section II: Technical Biology; Karlsruhe Institute of Technology; Karlsruhe Baden-Württemberg 76131 Germany
| | - Boris Kühl
- Institute of Functional Interfaces; Karlsruhe Institute of Technology; Eggenstein-Lepoldshafen Baden-Württemberg 76344 Germany
| | - Gerald Brenner-Weiss
- Institute of Functional Interfaces; Karlsruhe Institute of Technology; Eggenstein-Lepoldshafen Baden-Württemberg 76344 Germany
| | - Christoph Syldatk
- Institute of Process Engineering in Life Sciences, Section II: Technical Biology; Karlsruhe Institute of Technology; Karlsruhe Baden-Württemberg 76131 Germany
| | - Jens Rudat
- Institute of Process Engineering in Life Sciences, Section II: Technical Biology; Karlsruhe Institute of Technology; Karlsruhe Baden-Württemberg 76131 Germany
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21
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Strempel N, Neidig A, Nusser M, Geffers R, Vieillard J, Lesouhaitier O, Brenner-Weiss G, Overhage J. Human host defense peptide LL-37 stimulates virulence factor production and adaptive resistance in Pseudomonas aeruginosa. PLoS One 2013; 8:e82240. [PMID: 24349231 PMCID: PMC3862677 DOI: 10.1371/journal.pone.0082240] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 10/21/2013] [Indexed: 12/02/2022] Open
Abstract
A multitude of different virulence factors as well as the ability to rapidly adapt to adverse environmental conditions are important features for the high pathogenicity of Pseudomonas aeruginosa. Both virulence and adaptive resistance are tightly controlled by a complex regulatory network and respond to external stimuli, such as host signals or antibiotic stress, in a highly specific manner. Here, we demonstrate that physiological concentrations of the human host defense peptide LL-37 promote virulence factor production as well as an adaptive resistance against fluoroquinolone and aminoglycoside antibiotics in P. aeruginosa PAO1. Microarray analyses of P. aeruginosa cells exposed to LL-37 revealed an upregulation of gene clusters involved in the production of quorum sensing molecules and secreted virulence factors (PQS, phenazine, hydrogen cyanide (HCN), elastase and rhamnolipids) and in lipopolysaccharide (LPS) modification as well as an induction of genes encoding multidrug efflux pumps MexCD-OprJ and MexGHI-OpmD. Accordingly, we detected significantly elevated levels of toxic metabolites and proteases in bacterial supernatants after LL-37 treatment. Pre-incubation of bacteria with LL-37 for 2 h led to a decreased susceptibility towards gentamicin and ciprofloxacin. Quantitative Realtime PCR results using a PAO1-pqsE mutant strain present evidence that the quinolone response protein and virulence regulator PqsE may be implicated in the regulation of the observed phenotype in response to LL-37. Further experiments with synthetic cationic antimicrobial peptides IDR-1018, 1037 and HHC-36 showed no induction of pqsE expression, suggesting a new role of PqsE as highly specific host stress sensor.
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Affiliation(s)
- Nikola Strempel
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Karlsruhe, Germany
| | - Anke Neidig
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Karlsruhe, Germany
| | - Michael Nusser
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Karlsruhe, Germany
| | - Robert Geffers
- Helmholtz Center for Infection Research, Genome Analytics, Braunschweig, Germany
| | | | - Olivier Lesouhaitier
- Laboratory of Microbiology Signals and Microenvironment LMSM EA 4312, University of Rouen, Evreux, France
| | - Gerald Brenner-Weiss
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Karlsruhe, Germany
| | - Joerg Overhage
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Karlsruhe, Germany
- * E-mail:
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22
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Jakubczyk D, Brenner-Weiss G, Bräse S. Synthesis of Tritium Labelled and PhotoactivatableN-Acyl-L-homoserine Lactones: Inter-Kingdom Signalling Molecules. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300800] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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23
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Jakubczyk D, Merle C, Brenner-Weiss G, Luy B, Bräse S. Deuterium and Tritium Labelling ofN-Acyl-L-homoserine Lactones (AHLs) by Catalytic Reduction of a Double Bond in the Layer-by-Layer Method. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300084] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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24
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Gözke G, Prechtl C, Kirschhöfer F, Mothes G, Ondruschka J, Brenner-Weiss G, Obst U, Posten C. Electrofiltration as a purification strategy for microbial poly-(3-hydroxybutyrate). Bioresour Technol 2012; 123:272-278. [PMID: 22940329 DOI: 10.1016/j.biortech.2012.07.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Revised: 06/02/2012] [Accepted: 07/13/2012] [Indexed: 06/01/2023]
Abstract
The biodegradable polyester poly-(3-hydroxybutyrate) (PHB), produced by Ralstonia eutropha in batch and fed-batch processes, was purified by electrofiltration. The protein film on PHB granules determines their high negative zeta potential, enabling the application of electrofiltration as an integrated technology in the downstream processing of PHB. In order to determine the optimal purification parameters, various pressure and electric field strength conditions were tested. Electrofiltration of PHB at 4bars and 4V/mm provided an up to four times higher concentration factor than conventional filtration. FT-Raman spectroscopy demonstrated that electrofiltration did not result in structural changes to the products. The study demonstrates the efficiency and practical advantages of electrofiltration as a promising downstream step in the PHB production technology.
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Affiliation(s)
- Gözde Gözke
- Institute of Process Engineering in Life Sciences, Bioprocess Engineering, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, Build. 30.44, D-76131 Karlsruhe, Germany.
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25
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Weger BD, Weger M, Nusser M, Brenner-Weiss G, Dickmeis T. A chemical screening system for glucocorticoid stress hormone signaling in an intact vertebrate. ACS Chem Biol 2012; 7:1178-83. [PMID: 22545806 PMCID: PMC3401037 DOI: 10.1021/cb3000474] [Citation(s) in RCA: 51] [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] [Indexed: 11/30/2022]
Abstract
![]()
Glucocorticoids, steroid hormones of the adrenal gland,
are an
integral part of the stress response and regulate glucose metabolism.
Natural and synthetic glucocorticoids are widely used in anti-inflammatory
therapy but can have severe side effects. In vivo tests are needed to identify novel glucocorticoids and to screen
compounds for unwanted effects on glucocorticoid signaling. We created
the Glucocorticoid Responsive In vivoZebrafish Luciferase
activitY assay to monitor glucocorticoid signaling in vivo. The GRIZLY assay detects stress-induced glucocorticoid
production in single zebrafish larvae, measures disruption of glucocorticoid
signaling by an organotin pollutant metabolite, and specifically identifies
a compound stimulating endogenous glucocorticoid production in a chemical
screen. Our assay has broad applications in stress research, environmental
monitoring, and drug discovery.
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Affiliation(s)
- Benjamin D. Weger
- Institute
of Toxicology and Genetics and ‡Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Meltem Weger
- Institute
of Toxicology and Genetics and ‡Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Michael Nusser
- Institute
of Toxicology and Genetics and ‡Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Gerald Brenner-Weiss
- Institute
of Toxicology and Genetics and ‡Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Thomas Dickmeis
- Institute
of Toxicology and Genetics and ‡Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz
1, D-76344 Eggenstein-Leopoldshafen, Germany
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26
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Barth C, Jakubczyk D, Kubas A, Anastassacos F, Brenner-Weiss G, Fink K, Schepers U, Bräse S, Koelsch P. Interkingdom signaling: integration, conformation, and orientation of N-acyl-L-homoserine lactones in supported lipid bilayers. Langmuir 2012; 28:8456-62. [PMID: 22568488 PMCID: PMC3388113 DOI: 10.1021/la301241s] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
N-Acyl-L-homoserine lactones (AHLs) are small cell-to-cell signaling molecules involved in the regulation of population density and local gene expression in microbial communities. Recent evidence shows that contact of this signaling system, usually referred to as quorum sensing, to living eukaryotes results in interactions of AHL with host cells in a process termed "interkingdom signaling". So far details of this process and the binding site of the AHLs remain unknown; both an intracellular and a membrane-bound receptor seem possible, the first of which requires passage through the cell membrane. Here, we used sum-frequency-generation (SFG) spectroscopy to investigate the integration, conformation, orientation, and translocation of deuterated N-acyl-L-homoserine lactones (AHL-d(n)) with varying chain length (8, 12, and 14 C atoms) in lipid bilayers consisting of a 1:1 mixture of POPC:POPG supported on SiO(2) substrates (prepared by vesicle fusion). We found that all AHL-d(n) derivatives are well-ordered within the supported lipid bilayer (SLB) in a preferentially all-trans conformation of the deuterated alkyl chain and integrated into the upper leaflet of the SLB with the methyl terminal groups pointing downward. For the bilayer system described above, no flip-flop of AHL-d(n) from the upper leaflet to the lower one could be observed. Spectral assignments and interpretations were further supported by Fourier transform infrared and Raman spectroscopy.
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Affiliation(s)
- Christoph Barth
- Institute for Toxicology and Genetics, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Dorota Jakubczyk
- Institute for Functional Interfaces, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Adam Kubas
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Frances Anastassacos
- Institute for Toxicology and Genetics, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Gerald Brenner-Weiss
- Institute for Functional Interfaces, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Karin Fink
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Ute Schepers
- Institute for Toxicology and Genetics, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Stefan Bräse
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany
| | - Patrick Koelsch
- National ESCA and Surface Analysis Center for Biomedical Problems, Department of Bioengineering, University of Washington, Box 35170, Seattle, WA 98195-1750
- Corresponding author.
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27
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Kahle NA, Brenner-Weiss G, Overhage J, Obst U, Hänsch GM. Bacterial quorum sensing molecule induces chemotaxis of human neutrophils via induction of p38 and leukocyte specific protein 1 (LSP1). Immunobiology 2012; 218:145-51. [PMID: 22401915 DOI: 10.1016/j.imbio.2012.02.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 01/31/2012] [Accepted: 02/07/2012] [Indexed: 10/14/2022]
Abstract
When bacteria colonize surfaces, they socialize and form biofilms. This process is well regulated and relies on the communication among the bacteria via so-called "quorum sensing molecules". Among those, N-(3-oxododecanoyl)-L-homoserine lactone (AHL-12), generated by Pseudomonas aeruginosa and other Gram-negative bacteria, activates not only bacteria but also interacts with mammalian cells. Among others, it activates phagocytic cells and - as we had shown previously - it is chemotactic for human polymorphonuclear neutrophils (PMN) in vitro. In the present study, we analyzed the signalling pathway of AHL-12 in PMN. We focused on the mitogen activated protein (MAP) kinase p38, because SB203580, an inhibitor of p38, prevented the AHL-12 induced chemotaxis. We found that in response to AHL-12, p38 was phosphorylated within minutes, as was its downstream target, the MAPKAP-Kinase-2 (MK2). In PMN, the major substrate of MK2 is the leukocyte specific protein 1 (LSP1), which binds to F-actin and participates directly in actin polymerization and cell migration. In response to AHL-12, LSP1 was phosphorylated and co-localized with F-actin in polarized PMN, suggesting that AHL-12-induced migration depended on p38 and LSP1 activation.
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Affiliation(s)
- N A Kahle
- Institut für Immunologie der Universität Heidelberg, Heidelberg, Germany.
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28
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Ruh H, Kühl B, Brenner-Weiss G, Hopf C, Diabaté S, Weiss C. Identification of serum proteins bound to industrial nanomaterials. Toxicol Lett 2011; 208:41-50. [PMID: 22001751 DOI: 10.1016/j.toxlet.2011.09.009] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 09/09/2011] [Accepted: 09/13/2011] [Indexed: 01/04/2023]
Abstract
Nanoparticles (NPs) are decorated with proteins and other biomolecules when they get into contact with biological systems. The presence of proteins in cell culture medium can therefore have effects on the biological outcome in cell-based tests. In this study, the manufactured nanomaterials silicon dioxide (SiO(2)), titanium dioxide (TiO(2)), iron-III-oxide (Fe(2)O(3)), and carbon black (CB) were used to study their interaction with single proteins from bovine and human plasma (albumin, fibrinogen and IgG) as well as with complete human serum. The protein binding capacity of the material was investigated and 1D gel electrophoresis was used to separate the bound proteins and to identify the bands by matrix-assisted laser desorption/ionisation-time-of-flight (MALDI-TOF) mass spectrometry. We found that the NP surface chemistry had a great impact on the amount of bound protein with distinct ligands for each of the tested particles. The hydrophobic CB NPs bound much more protein than the hydrophilic metal oxide NPs. Among the single proteins investigated, fibrinogen showed the strongest affinity for SiO(2), TiO(2) and CB NPs. The identified proteins from human serum adsorbed to these NPs were very different. Only apolipoprotein A1 was found to be adsorbed to all NPs. These studies will help to explain the different degree of biological responses observed after in vitro exposure of cells in the absence or presence of serum and might also support the interpretation of in vivo experiments were NPs come directly into contact with blood plasma.
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Affiliation(s)
- Hermelindis Ruh
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Campus North, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.
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29
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Gözke G, Kirschhöfer F, Heissler S, Trutnau M, Brenner-Weiss G, Ondruschka J, Obst U, Posten C. Filtration kinetics of chitosan separation by electrofiltration. Biotechnol J 2011; 7:262-74. [DOI: 10.1002/biot.201000466] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Revised: 03/21/2011] [Accepted: 04/04/2011] [Indexed: 01/30/2023]
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30
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Krumov N, Kirschhöfer F, Brenner-Weiss G, Obst U, Posten C. Entwicklung einer Prozesskette für die Bionanopartikel-Produktion. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050473] [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: 11/08/2022]
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31
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Krumov N, Kirschhöfer F, Perner-Nochta I, Brenner-Weiss G, Obst U, Posten C. Biosynthese von Cadmiumsulfid-Nanopartikeln mit Hefen in einem Fed-Batch-Prozess. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950062] [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: 11/07/2022]
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32
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Wagner C, Zimmermann S, Brenner-Weiss G, Hug F, Prior B, Obst U, Hänsch GM. The quorum-sensing molecule N-3-oxododecanoyl homoserine lactone (3OC12-HSL) enhances the host defence by activating human polymorphonuclear neutrophils (PMN). Anal Bioanal Chem 2007. [PMID: 16906383 DOI: 10.1007/s00216-006-0698-695] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The P. aeruginosa quorum-sensing molecule N-3-oxododecanoyl homoserine lactone (3OC12-HSL) interacts not only with bacteria, but also with mammalian cells, among others with those of the immune defence system. We focussed on the possible interaction of 3OC12-HSL with human polymorphonuclear neutrophils (PMN), because these cells are the first to enter an infected site. We found that 3OC12-HSL attracts PMN, and up-regulates expression of receptors known to be involved in host defence, including the adhesion proteins CD11b/CD18 and the immunoglobulin receptors CD16 and CD64. Furthermore, the uptake of bacteria (phagocytosis), which is crucial for an efficient defence against infection, was enhanced. Thus, recognising and responding to 3OC12-HSL not only attracts the PMN to the site of a developing biofilm, but also reinforces their defence mechanisms, and hence could be a means to control the infection in an early stage and to prevent biofilm formation.
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Affiliation(s)
- Christof Wagner
- Institut für Immunologie der Universität Heidelberg, Im Neuenheimer Feld 305, 69120, Heidelberg, Germany
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33
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Zimmermann S, Wagner C, Müller W, Brenner-Weiss G, Hug F, Prior B, Obst U, Hänsch GM. Induction of neutrophil chemotaxis by the quorum-sensing molecule N-(3-oxododecanoyl)-L-homoserine lactone. Infect Immun 2006; 74:5687-92. [PMID: 16988244 PMCID: PMC1594900 DOI: 10.1128/iai.01940-05] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Acyl homoserine lactones are synthesized by Pseudomonas aeruginosa as signaling molecules which control production of virulence factors and biofilm formation in a paracrine manner. We found that N-(3-oxododecanoyl)-L-homoserine lactone (3OC12-HSL), but not its 3-deoxo isomer or acyl-homoserine lactones with shorter fatty acids, induced the directed migration (chemotaxis) of human polymorphonuclear neutrophils (PMN) in vitro. By use of selective inhibitors a signaling pathway, comprising phosphotyrosine kinases, phospholipase C, protein kinase C, and mitogen-activated protein kinase C, could be delineated. In contrast to the well-studied chemokines complement C5a and interleukin 8, the chemotaxis did not depend on pertussis toxin-sensitive G proteins, indicating that 3OC12-HSL uses another signaling pathway. Strong evidence for the presence of a receptor for 3OC12-HSL on PMN was derived from uptake studies; by use of radiolabeled 3OC12-HSL, specific and saturable binding to PMN was seen. Taken together, our data provide evidence that PMN recognize and migrate toward a source of 3OC12-HSL (that is, to the site of a developing biofilm). We propose that this early attraction of PMN could contribute to prevention of biofilm formation.
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Affiliation(s)
- Sabine Zimmermann
- Institut für Immunologie der Universität Heidelberg, Im Neuenheimer Feld 305, 69120 Heidelberg, Germany
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34
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Wagner C, Zimmermann S, Brenner-Weiss G, Hug F, Prior B, Obst U, Hänsch GM. The quorum-sensing molecule N-3-oxododecanoyl homoserine lactone (3OC12-HSL) enhances the host defence by activating human polymorphonuclear neutrophils (PMN). Anal Bioanal Chem 2006; 387:481-7. [PMID: 16906383 DOI: 10.1007/s00216-006-0698-5] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Revised: 07/10/2006] [Accepted: 07/19/2006] [Indexed: 01/31/2023]
Abstract
The P. aeruginosa quorum-sensing molecule N-3-oxododecanoyl homoserine lactone (3OC12-HSL) interacts not only with bacteria, but also with mammalian cells, among others with those of the immune defence system. We focussed on the possible interaction of 3OC12-HSL with human polymorphonuclear neutrophils (PMN), because these cells are the first to enter an infected site. We found that 3OC12-HSL attracts PMN, and up-regulates expression of receptors known to be involved in host defence, including the adhesion proteins CD11b/CD18 and the immunoglobulin receptors CD16 and CD64. Furthermore, the uptake of bacteria (phagocytosis), which is crucial for an efficient defence against infection, was enhanced. Thus, recognising and responding to 3OC12-HSL not only attracts the PMN to the site of a developing biofilm, but also reinforces their defence mechanisms, and hence could be a means to control the infection in an early stage and to prevent biofilm formation.
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Affiliation(s)
- Christof Wagner
- Institut für Immunologie der Universität Heidelberg, Im Neuenheimer Feld 305, 69120, Heidelberg, Germany
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35
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Schillo S, Belusic G, Hartmann K, Franz C, Kühl B, Brenner-Weiss G, Paulsen R, Huber A. Targeted mutagenesis of the farnesylation site of Drosophila Ggammae disrupts membrane association of the G protein betagamma complex and affects the light sensitivity of the visual system. J Biol Chem 2004; 279:36309-16. [PMID: 15205461 DOI: 10.1074/jbc.m404611200] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Activation of phototransduction in the compound eye of Drosophila is mediated by a heterotrimeric G protein that couples to the effector enzyme phospholipase Cbeta. The gamma subunit of this G protein (Ggammae) as well as gamma subunits of vertebrate transducins contain a carboxyl-terminal CAAX motif (C, cysteine; A, aliphatic amino acid; X, any amino acid) with a consensus sequence for protein farnesylation. To examine the function of Ggammae farnesylation, we mutated the farnesylation site and overexpressed the mutated Ggammae in Drosophila. Mass spectrometry of overexpressed Ggammae subunits revealed that nonmutated Ggammae is modified by farnesylation, whereas the mutated Ggammae is not farnesylated. In the transgenic flies, mutated Ggammae forms a dimeric complex with Gbetae, with the consequence that the fraction of non-membrane-bound Gbetagamma is increased. Thus, farnesylation of Ggammae facilitates the membrane attachment of the Gbetagamma complex. We also expressed human Ggammarod in Drosophila photoreceptors. Despite similarities in the primary structure between the transducin gamma subunit and Drosophila Ggammae, we observed no interaction of human Ggammarod with Drosophila Gbetae. This finding indicates that human Ggammarod and Drosophila Ggammae provide different interfaces for the interaction with Gbeta subunits. Electroretinogram recordings revealed a significant loss of light sensitivity in eyes of transgenic flies that express mutated Ggammae. This loss in light sensitivity reveals that post-translational farnesylation is a critical step for the formation of membrane-associated Galphabetagamma required for transmitting light activation from rhodopsin to phospholipase Cbeta.
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Affiliation(s)
- Simone Schillo
- Institut für Zoologie, Universität Karlsruhe, Haid-und-Neu-Strasse 9, Karlsruhe 76131, Germany
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36
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Brenner-Weiss G, Obst U. Approaches to bioresponse-linked instrumental analysis in water analysis. Anal Bioanal Chem 2003; 377:408-16. [PMID: 12923609 DOI: 10.1007/s00216-003-2162-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2003] [Revised: 07/08/2003] [Accepted: 07/08/2003] [Indexed: 10/26/2022]
Abstract
A new concept based on hyphenation of biotests, for biological selection, and chemical analysis is introduced for water analysis. Biomolecular recognition components such as receptors, enzymes, and nucleic acids integrated in biological reaction chains are used for binding and selective enrichment of known and unknown biologically active substances in water samples; this is followed by identification and quantitation. The coupling of biomolecular recognition and binding to chemical analysis can be achieved either in discrete analytical steps, e.g. binding and elution of bioactive ligands from affinity columns followed by chemical analysis, or by methods capable of monitoring the binding of the ligand and simultaneous verification of its identity. This analytical strategy, denoted bioresponse-linked instrumental analysis (BLIA), enables detection of potential biological effects and identification of the analyte causing these effects. Several examples are presented.
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Affiliation(s)
- Gerald Brenner-Weiss
- Forschungszentrum Karlsruhe, Bereich Wasser- und Geotechnologie (ITC-WGT), Postfach 36 40, Institut für Technische Chemie, 76021, Karlsruhe, Germany.
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Brenner-Weiss G, Kirschhöfer F, Kühl B, Nusser M, Obst U. Analysis of non-covalent protein complexes by capillary electrophoresis–time-of-flight mass spectrometry. J Chromatogr A 2003; 1009:147-53. [PMID: 13677655 DOI: 10.1016/s0021-9673(03)00553-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A capillary electrophoresis-electrospray ionisation time-of-flight mass spectrometry (CE-ESI-TOF-MS) method for characterisation of non-covalent protein complexes is described using a coaxial liquid sheath-flow sprayer. The CE capillary was connected to the mass spectrometer using a commercial CE-MS sprayer mounted on a ceramic holder of the ESI interface of the mass spectrometer. Using myoglobin (Mb) as an example of non-covalent protein complex, the effect on complex stability caused by organic modifiers added to the sheath liquid was analysed. Depending on the amount of methanol, either intact Mb or the apoprotein and the prosthetic heme group were detected.
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Affiliation(s)
- Gerald Brenner-Weiss
- Forschungszentrum Karlsruhe, Institut für Technische Chemie, Bereich Wasser- und Geotechnologie Postfach 36 40, 76021 Karlsruhe, Germany.
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Shipkova M, Armstrong VW, Wieland E, Niedmann PD, Schütz E, Brenner-Weiss G, Voihsel M, Braun F, Oellerich M. Identification of glucoside and carboxyl-linked glucuronide conjugates of mycophenolic acid in plasma of transplant recipients treated with mycophenolate mofetil. Br J Pharmacol 1999; 126:1075-82. [PMID: 10204993 PMCID: PMC1565876 DOI: 10.1038/sj.bjp.0702399] [Citation(s) in RCA: 167] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
1. Mycophenolic acid (MPA), is primarily metabolized in the liver to 7-O-MPA-beta-glucuronide (MPAG). Using RP-h.p.l.c. we observed three further MPA metabolites, M-1, M-2, M-3, in plasma of transplant recipients on MMF therapy. To obtain information on the structure and source of these metabolites: (A) h.p.l.c. fractions containing either metabolite or MPA were collected and analysed by tandem mass spectrometry; (B) the metabolism of MPA was studied in human liver microsomes in the presence of UDP-glucuronic acid, UDP-glucose or NADPH; (C) hydrolysis of metabolites was investigated using beta-glucosidase, beta-glucuronidase or NaOH; (D) cross-reactivity of each metabolite was tested in an immunoassay for MPA (EMIT). 2. Mass spectrometry of M-1, M-2, MPA and MPAG in the negative ion mode revealed molecular ions of m/z 481, m/z 495, m/z 319 and m/z 495 respectively. 3. Incubation of microsomes with MPA and UDP-glucose produced M-1, with MPA and UDP-glucuronic acid MPAG and M-2 were formed, while with MPA and NADPH, M-3 was observed. 4. Beta-Glucosidase hydrolysed M-1 completely. Beta-Glucuronidase treatment led to a complete disappearance of MPAG whereas the amount of M-2 was reduced by approximately 30%. Only M-2 was labile to alkaline treatment. 5. M-2 and MPA but not M-1 and MPAG cross-reacted in the EMIT assay. 6. These results suggest that: (i) M-1 is the 7-OH glucose conjugate of MPA; (ii) M-2 is the acyl glucuronide conjugate of MPA; (iii) M-3 is derived from the hepatic CYP450 system.
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Affiliation(s)
- M Shipkova
- Abteilung Klinische Chemie, George-August-Universität Göttingen, Germany.
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van Echten G, Birk R, Brenner-Weiss G, Schmidt RR, Sandhoff K. Modulation of sphingolipid biosynthesis in primary cultured neurons by long chain bases. J Biol Chem 1990; 265:9333-9. [PMID: 2111818] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Sphingolipid biosynthesis was studied in cultured murine cerebellar cells in the absence and presence of exogenous sphingosine homologues with different alkyl chain lengths (12, 18, and 24 carbon atoms). Labeling of cells with [14C]serine for 24 h indicated that endogenous sphingosine biosynthesis with incorporation of radiolabeled serine was inhibited by these long chain bases (0.5-50 microM) in a concentration-dependent manner; the inhibition was fully reversible after removal of the long chain bases from the culture medium. Metabolic labeling of neurons with [14C]galactose provided strong evidence that the cells were able to use the exogenous sphingosine homologues, irrespective of their alkyl chain length, as substrates for the biosynthesis of glycosphingolipids. When the biosynthetically inert sphingoid, azidosphingosine (5-50 microM), was fed to the cells, de novo sphingosine and glycosphingolipid biosynthesis were both strongly inhibited.
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Affiliation(s)
- G van Echten
- Institut für Organische Chemie und Biochemie, Bonn, Federal Republic of Germany
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van Echten G, Birk R, Brenner-Weiss G, Schmidt RR, Sandhoff K. Modulation of sphingolipid biosynthesis in primary cultured neurons by long chain bases. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)38853-2] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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