1
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Happel L, Voigt A. Coordinated Motion of Epithelial Layers on Curved Surfaces. Phys Rev Lett 2024; 132:078401. [PMID: 38427891 DOI: 10.1103/physrevlett.132.078401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 12/21/2023] [Indexed: 03/03/2024]
Abstract
Coordinated cellular movements are key processes in tissue morphogenesis. Using a cell-based modeling approach we study the dynamics of epithelial layers lining surfaces with constant and varying curvature. We demonstrate that extrinsic curvature effects can explain the alignment of cell elongation with the principal directions of curvature. Together with specific self-propulsion mechanisms and cell-cell interactions this effect gets enhanced and can explain observed large-scale, persistent, and circumferential rotation on cylindrical surfaces. On toroidal surfaces the resulting curvature coupling is an interplay of intrinsic and extrinsic curvature effects. These findings unveil the role of curvature and postulate its importance for tissue morphogenesis.
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Affiliation(s)
- L Happel
- Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany
| | - A Voigt
- Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany
- Center for Systems Biology Dresden, Pfotenhauerstr. 108, 01307 Dresden, Germany
- Cluster of Excellence, Physics of Life, TU Dresden, Arnoldstr. 18, 01307 Dresden, Germany
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2
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Zhang J, Reif J, Strobel C, Chava P, Erbe A, Voigt A, Mikolajick T, Kirchner R. Dry release of MEMS origami using thin Al2O3 films for facet-based device integration. Micro and Nano Engineering 2023. [DOI: 10.1016/j.mne.2023.100179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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3
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Benesova K, Hansen O, Sander O, Feuchtenberger M, Nigg A, Voigt A, Seipelt E, Schneider M, Lorenz HM, Krause A. [Further development of regional early care-Many roads lead to Rome : Developmental stages of four established rheumatological early care concepts in different regions of Germany]. Z Rheumatol 2022; 81:445-462. [PMID: 35670879 PMCID: PMC9171475 DOI: 10.1007/s00393-022-01220-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/03/2022] [Indexed: 11/25/2022]
Abstract
In order to shorten the prognostically relevant waiting time until diagnosis and initiation of appropriate treatment in inflammatory rheumatic diseases, rheumatological centers in many regions across Germany have established and continuously developed specific early care concepts. Evaluated models from Altötting·Burghausen, Berlin Buch, Düsseldorf and Heidelberg and their developmental stages as a response to internal and external challenges are presented in this overview. The transparent publication of the developmental steps and the exchange of experiences aim at promoting new early care concepts in other regions and continuing the joint dialogue for improvement of the early detection and quality of care of inflammatory rheumatic diseases in Germany.
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Affiliation(s)
- K Benesova
- Innere Medizin V, Sektion Rheumatologie, Universitätsklinikum Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Deutschland.
| | - O Hansen
- Innere Medizin V, Sektion Rheumatologie, Universitätsklinikum Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Deutschland
| | - O Sander
- Poliklinik und Funktionsbereich für Rheumatologie & Hiller Forschungszentrum Rheumatologie, UKD Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Deutschland
| | - M Feuchtenberger
- MVZ MED|BAYERN OST Altötting·Burghausen, Burghausen, Deutschland
| | - A Nigg
- MVZ MED|BAYERN OST Altötting·Burghausen, Burghausen, Deutschland
| | - A Voigt
- Abteilung für Rheumatologie, Osteologie und Klinische Immunologie, Immanuel Krankenhaus Berlin, Berlin, Deutschland
| | - E Seipelt
- Abteilung für Rheumatologie, Osteologie und Klinische Immunologie, Immanuel Krankenhaus Berlin, Berlin, Deutschland
| | - M Schneider
- Poliklinik und Funktionsbereich für Rheumatologie & Hiller Forschungszentrum Rheumatologie, UKD Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Deutschland
| | - H-M Lorenz
- Innere Medizin V, Sektion Rheumatologie, Universitätsklinikum Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Deutschland
- ACURA Rheumazentrum Baden-Baden, Baden-Baden, Deutschland
| | - A Krause
- Abteilung für Rheumatologie, Osteologie und Klinische Immunologie, Immanuel Krankenhaus Berlin, Berlin, Deutschland
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4
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Jain HP, Wenzel D, Voigt A. Impact of contact inhibition on collective cell migration and proliferation. Phys Rev E 2022; 105:034402. [PMID: 35428163 DOI: 10.1103/physreve.105.034402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 02/09/2022] [Indexed: 06/14/2023]
Abstract
Contact inhibition limits migration and proliferation of cells in cell colonies. We consider a multiphase field model to investigate the growth dynamics of a cell colony, composed of proliferating cells. The model takes into account the mechanism of contact inhibition of proliferation by local mechanical interactions. We compare nonmigrating and migrating cells, in order to provide a quantitative characterization of the dynamics and analyze the velocity of the colony boundary for both cases. Additionally, we measure single cell velocities, number of neighbor distributions, as well as the influence of stress and age on positions of the cells and with respect to each other.
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Affiliation(s)
- H P Jain
- Institute of Scientific Computing, Technische Universität Dresden, D-01062 Dresden, Germany
| | - D Wenzel
- Institute of Scientific Computing, Technische Universität Dresden, D-01062 Dresden, Germany
| | - A Voigt
- Institute of Scientific Computing, Technische Universität Dresden, D-01062 Dresden, Germany
- Center for Systems Biology Dresden (CSBD), Pfotenhauerstr. 108, D-01307 Dresden, Germany
- Cluster of Excellence - Physics of Life, TU Dresden, D-01062 Dresden, Germany
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5
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Abstract
Confluent cell monolayers and epithelia tissues show remarkable patterns and correlations in structural arrangements and actively driven collective flows. We simulate these properties using multiphase field models. The models are based on cell deformations and cell-cell interactions and we investigate the influence of microscopic details to incorporate active forces on emerging phenomena. We compare four different approaches, one in which the activity is determined by a random orientation, one where the activity is related to the deformation of the cells, and two models with subcellular details to resolve the mechanochemical interactions underlying cell migration. The models are compared with respect to generic features, such as coordination number distribution, cell shape variability, emerging nematic properties, as well as vorticity correlations and flow patterns in large confluent monolayers and confinements. All results are compared with experimental data for a large variety of cell cultures. The appearing qualitative differences of the models show the importance of microscopic details and provide a route towards predictive simulations of patterns and correlations in cell colonies.
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Affiliation(s)
- D Wenzel
- Institute of Scientific Computing, Technische Universität Dresden, 01062 Dresden, Germany
| | - A Voigt
- Institute of Scientific Computing, Technische Universität Dresden, 01062 Dresden, Germany.,Center for Systems Biology Dresden (CSBD), Pfotenhauerstr. 108, 01307 Dresden, Germany.,Cluster of Excellence-Physics of Life, TU Dresden, 01062 Dresden, Germany
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6
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Idda T, Bonas C, Hoffmann J, Bertram J, Quinete N, Schettgen T, Fietkau K, Esser A, Stope MB, Leijs MM, Baron JM, Kraus T, Voigt A, Ziegler P. Metabolic activation and toxicological evaluation of polychlorinated biphenyls in Drosophila melanogaster. Sci Rep 2020; 10:21587. [PMID: 33299007 PMCID: PMC7726022 DOI: 10.1038/s41598-020-78405-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 11/20/2020] [Indexed: 01/26/2023] Open
Abstract
Degradation of polychlorinated biphenyls (PCBs) is initiated by cytochrome P450 (CYP) enzymes and includes PCB oxidation to OH-metabolites, which often display a higher toxicity than their parental compounds. In search of an animal model reflecting PCB metabolism and toxicity, we tested Drosophila melanogaster, a well-known model system for genetics and human disease. Feeding Drosophila with lower chlorinated (LC) PCB congeners 28, 52 or 101 resulted in the detection of a human-like pattern of respective OH-metabolites in fly lysates. Feeding flies high PCB 28 concentrations caused lethality. Thus we silenced selected CYPs via RNA interference and analyzed the effect on PCB 28-derived metabolite formation by assaying 3-OH-2',4,4'-trichlorobiphenyl (3-OHCB 28) and 3'-OH-4',4,6'-trichlorobiphenyl (3'-OHCB 28) in fly lysates. We identified several drosophila CYPs (dCYPs) whose knockdown reduced PCB 28-derived OH-metabolites and suppressed PCB 28 induced lethality including dCYP1A2. Following in vitro analysis using a liver-like CYP-cocktail, containing human orthologues of dCYP1A2, we confirm human CYP1A2 as a PCB 28 metabolizing enzyme. PCB 28-induced mortality in flies was accompanied by locomotor impairment, a common phenotype of neurodegenerative disorders. Along this line, we show PCB 28-initiated caspase activation in differentiated fly neurons. This suggested the loss of neurons through apoptosis. Our findings in flies are congruent with observation in human exposed to high PCB levels. In plasma samples of PCB exposed humans, levels of the neurofilament light chain increase after LC-PCB exposure, indicating neuronal damage. In summary our findings demonstrate parallels between Drosophila and the human systems with respect to CYP mediated metabolism and PCB mediated neurotoxicity.
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Affiliation(s)
- T Idda
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - C Bonas
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - J Hoffmann
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - J Bertram
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - N Quinete
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
- Department of Chemistry and Biochemistry, Florida International University Florida, Florida, USA
| | - T Schettgen
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - K Fietkau
- Department of Dermatology and Allergology, RWTH Aachen University, 52074, Aachen, Germany
| | - A Esser
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - M B Stope
- Department of Gynecology and Gynecological Oncology, University Hospital Bonn, Bonn, Germany
| | - M M Leijs
- Department of Dermatology and Allergology, RWTH Aachen University, 52074, Aachen, Germany
| | - J M Baron
- Department of Dermatology and Allergology, RWTH Aachen University, 52074, Aachen, Germany
| | - T Kraus
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - A Voigt
- Department of Neurology, University Medical Center, RWTH Aachen University, 52074, Aachen, Germany
- JARA-BRAIN Institute Molecular Neuroscience and Neuroimaging, Forschungszentrum Jülich GmbH, RWTH Aachen University, 52074, Aachen, Germany
| | - P Ziegler
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany.
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7
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Frenzel F, König-Mattern L, Stock V, Voss L, Paul MB, Sieg H, Braeuning A, Voigt A, Böhmert L. NanoPASS: an easy-to-use user interface for nanoparticle dosimetry with the 3DSDD model. Part Fibre Toxicol 2020; 17:45. [PMID: 32948196 PMCID: PMC7502021 DOI: 10.1186/s12989-020-00368-w] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/22/2020] [Indexed: 11/25/2022] Open
Abstract
Nanoparticles exhibit a specific diffusion and sedimentation behavior under cell culture conditions as used in nantoxicological in vitro testing. How a particular particle suspension behaves depends on the particular physicochemical characteristics of the particles and the cell culture system. Only a fraction of the nanoparticles applied to a cell culture will thus reach the cells within a given time frame. Therefore, dosimetric calculations are essential not only to determine the exact fraction of nanoparticles that has come into contact with the cells, but also to ensure experimental comparability and correct interpretation of results, respectively. Yet, the use of published dosimetry models is limited. Not the least because the correct application of these in silico tools usually requires bioinformatics knowledge, which often is perceived a hurdle. Moreover, not all models are freely available and accessible. In order to overcome this obstacle, we have now developed an easy-to-use interface for our recently published 3DSDD dosimetry model, called NanoPASS (NanoParticle Administration Sedimentation Simulator). The interface is freely available to all researchers. It will facilitate the use of in silico dosimetry in nanotoxicology and thus improve interpretation and comparability of in vitro results in the field.
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Affiliation(s)
- Falko Frenzel
- German Federal Institute for Risk Assessment, Department of Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Laura König-Mattern
- Otto-von-Guericke University Magdeburg, Chair of Process Systems Engineering, Universitätsplatz 2, 39016, Magdeburg, Germany
| | - Valerie Stock
- German Federal Institute for Risk Assessment, Department of Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Linn Voss
- German Federal Institute for Risk Assessment, Department of Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Maxi B Paul
- German Federal Institute for Risk Assessment, Department of Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Holger Sieg
- German Federal Institute for Risk Assessment, Department of Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Albert Braeuning
- German Federal Institute for Risk Assessment, Department of Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Andreas Voigt
- Otto-von-Guericke University Magdeburg, Chair of Process Systems Engineering, Universitätsplatz 2, 39016, Magdeburg, Germany
| | - Linda Böhmert
- German Federal Institute for Risk Assessment, Department of Food Safety, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany.
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8
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Marx-Blümel L, Marx C, Weise F, Frey J, Perner B, Schlingloff G, Lindig N, Hampl J, Sonnemann J, Brauer D, Voigt A, Singh S, Beck B, Jäger UM, Wang ZQ, Beck JF, Schober A. Biomimetic reconstruction of the hematopoietic stem cell niche for in vitro amplification of human hematopoietic stem cells. PLoS One 2020; 15:e0234638. [PMID: 32569325 PMCID: PMC7307768 DOI: 10.1371/journal.pone.0234638] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 05/29/2020] [Indexed: 12/13/2022] Open
Abstract
Hematopoietic stem cell transplantation is successfully applied since the late 1950s; however, its efficacy still needs to be increased. A promising strategy is to transplant high numbers of pluripotent hematopoietic stem cells (HSCs). Therefore, an improved ex vivo culture system that supports proliferation and maintains HSC pluripotency would override possible limitations in cell numbers gained from donors. To model the natural HSC niche in vitro, we optimized the HSC medium composition with a panel of cytokines and valproic acid and used an artificial 3D bone marrow-like scaffold made of polydimethylsiloxane (PDMS). This 3D scaffold offered a suitable platform to amplify human HSCs in vitro and, simultaneously, to support their viability, multipotency and ability for self-renewal. Silicon oxide-covering of PDMS structures further improved amplification of CD34+ cells, although the conservation of naïve HSCs was better on non-covered 3D PDMS. Finally, we found that HSC cultivated on non-covered 3D PDMS generated most pluripotent colonies within colony forming unit assays. In conclusion, by combining biological and biotechnological approaches, we optimized in vitro HSCs culture conditions, resulting in improved amplification, multipotency maintenance and vitality of HSCs.
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Affiliation(s)
- L. Marx-Blümel
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
- Research Center Lobeda, Jena University Hospital, Jena, Germany
- * E-mail:
| | - C. Marx
- Leibniz Institute on Aging—Fritz Lipmann Institute (FLI), Jena, Germany
| | - F. Weise
- Institute for Micro and Nanotechnologies MacroNano, Nano-Biosystem Technology, Ilmenau University of Technology, Ilmenau, Germany
| | - J. Frey
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
- Research Center Lobeda, Jena University Hospital, Jena, Germany
| | - B. Perner
- Leibniz Institute on Aging—Fritz Lipmann Institute (FLI), Jena, Germany
| | - G. Schlingloff
- Institute for Micro and Nanotechnologies MacroNano, Nano-Biosystem Technology, Ilmenau University of Technology, Ilmenau, Germany
| | - N. Lindig
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
- Research Center Lobeda, Jena University Hospital, Jena, Germany
| | - J. Hampl
- Institute for Micro and Nanotechnologies MacroNano, Nano-Biosystem Technology, Ilmenau University of Technology, Ilmenau, Germany
| | - J. Sonnemann
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
- Research Center Lobeda, Jena University Hospital, Jena, Germany
| | - D. Brauer
- Institute for Micro and Nanotechnologies MacroNano, Nano-Biosystem Technology, Ilmenau University of Technology, Ilmenau, Germany
| | - A. Voigt
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
- Research Center Lobeda, Jena University Hospital, Jena, Germany
| | - S. Singh
- Institute for Micro and Nanotechnologies MacroNano, Nano-Biosystem Technology, Ilmenau University of Technology, Ilmenau, Germany
| | - B. Beck
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
- Research Center Lobeda, Jena University Hospital, Jena, Germany
| | - Ute-Maria Jäger
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
- Research Center Lobeda, Jena University Hospital, Jena, Germany
| | - Z. Q. Wang
- Leibniz Institute on Aging—Fritz Lipmann Institute (FLI), Jena, Germany
- Faculty of Biological Sciences, Friedrich-Schiller-University of Jena, Jena, Germany
| | - J. F. Beck
- Department of Paediatric Haematology and Oncology, Children’s Clinic, Jena University Hospital, Jena, Germany
| | - A. Schober
- Institute for Micro and Nanotechnologies MacroNano, Nano-Biosystem Technology, Ilmenau University of Technology, Ilmenau, Germany
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9
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Müller R, Henss A, Kampschulte M, Rohnke M, Langheinrich AC, Heiss C, Janek J, Voigt A, Wilke HJ, Ignatius A, Herfurth J, El Khassawna T, Deutsch A. Analysis of microscopic bone properties in an osteoporotic sheep model: a combined biomechanics, FE and ToF-SIMS study. J R Soc Interface 2020; 16:20180793. [PMID: 30958193 DOI: 10.1098/rsif.2018.0793] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The present study deals with the characterization of bone quality in a sheep model of postmenopausal osteoporosis. Sheep were sham operated ( n = 7), ovariectomized ( n = 6), ovariectomized and treated with deficient diet ( n = 8) or ovariectomized, treated with deficient diet and glucocorticoid injections ( n = 7). The focus of the study is on the microscopic properties at tissue level. Microscopic mechanical properties of osteoporotic bone were evaluated by a combination of biomechanical testing and mathematical modelling. Sample stiffness and strength were determined by compression tests and finite-element analysis of stress states was conducted. From this, an averaged microscopic Young's modulus at tissue level was determined. Trabecular structure as well as mineral and collagen distribution in samples of sheep vertebrae were analysed by micro-computed tomography and time-of-flight secondary ion mass spectrometry. In the osteoporotic sheep model, a disturbed fibril structure in the triple treated group was observed, but bone loss only occurred in form of reduced trabecular number and thickness and cortical decline, while quality of the residual bone was preserved. The preserved bone tissue properties in the osteoporotic sheep model allowed for an estimation of bone strength which behaves similar to the human case.
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Affiliation(s)
- R Müller
- 1 Centre for Information Services and High Performance Computing , TU Dresden, 01062 Dresden , Germany
| | - A Henss
- 2 Institute of Physical Chemistry and Center for Materials Research (ZfM/LaMa), Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - M Kampschulte
- 4 Department of Diagnostic and Interventional Radiology, University Hospital of Giessen-Marburg , 35392 Giessen , Germany
| | - M Rohnke
- 2 Institute of Physical Chemistry and Center for Materials Research (ZfM/LaMa), Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - A C Langheinrich
- 6 Department of Diagnostic and Interventional Radiology, BG Trauma Hospital , 60389 Frankfurt/Main , Germany
| | - C Heiss
- 3 Experimental Trauma Surgery, Justus-Liebig University of Giessen , 35392 Giessen , Germany.,5 Department of Trauma, Hand, and Reconstructive Surgery, University Hospital of Giessen-Marburg , Giessen , Germany
| | - J Janek
- 2 Institute of Physical Chemistry and Center for Materials Research (ZfM/LaMa), Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - A Voigt
- 8 Institute of Scientific Computing , TU Dresden, 01062 Dresden , Germany
| | - H J Wilke
- 7 Institute of Orthopaedic Research and Biomechanics, Trauma Research Centre, Ulm University-Medical Centre , Ulm , Germany
| | - A Ignatius
- 7 Institute of Orthopaedic Research and Biomechanics, Trauma Research Centre, Ulm University-Medical Centre , Ulm , Germany
| | - J Herfurth
- 3 Experimental Trauma Surgery, Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - T El Khassawna
- 3 Experimental Trauma Surgery, Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - A Deutsch
- 1 Centre for Information Services and High Performance Computing , TU Dresden, 01062 Dresden , Germany
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10
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Bartsch C, Wiedmeyer V, Lakdawala Z, Patterson RI, Voigt A, Sundmacher K, John V. Stochastic-deterministic population balance modeling and simulation of a fluidized bed crystallizer experiment. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.07.020] [Citation(s) in RCA: 3] [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: 11/16/2022]
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11
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Benesova K, Lorenz HM, Lion V, Voigt A, Krause A, Sander O, Schneider M, Feuchtenberger M, Nigg A, Leipe J, Briem S, Tiessen E, Haas F, Rihl M, Meyer-Olson D, Baraliakos X, Braun J, Schwarting A, Dreher M, Witte T, Assmann G, Hoeper K, Schmidt RE, Bartz-Bazzanella P, Gaubitz M, Specker C. [Early recognition and screening consultation: a necessary way to improve early detection and treatment in rheumatology? : Overview of the early recognition and screening consultation models for rheumatic and musculoskeletal diseases in Germany]. Z Rheumatol 2019; 78:722-742. [PMID: 31468170 DOI: 10.1007/s00393-019-0683-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In order to reduce the prognostically relevant time interval between the initial manifestation of a rheumatic and musculoskeletal disease and diagnosis as well as the consecutive initiation of an appropriate treatment, several rheumatological centers in Germany have improved the access to initial rheumatologic evaluation by establishing early recognition/screening clinics at their respective sites. Corresponding models located at Altoetting·Burghausen, Bad Pyrmont, Berlin Buch, Duesseldorf, Heidelberg, Herne, Mannheim as well as supraregional/multicenter initiatives Rheuma Rapid, RhePort and Rheuma-VOR are presented in this overview along with the respective characteristics, potential advantages and disadvantages, but also first evaluation results of several models. The aim of this publication is to promote early detection of rheumatic and musculoskeletal diseases as one of the most important challenges in current rheumatology by encouraging further rheumatologic centers and practices to launch their own early recognition/screening consultation model on the basis of aspects presented herein.
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Affiliation(s)
- K Benesova
- Sektion Rheumatologie, Innere Medizin V, Universitätsklinik Heidelberg, Heidelberg, Deutschland.
| | - H-M Lorenz
- Sektion Rheumatologie, Innere Medizin V, Universitätsklinik Heidelberg, Heidelberg, Deutschland.,ACURA Rheumazentrum Baden-Baden, Baden-Baden, Deutschland
| | - V Lion
- Sektion Rheumatologie, Innere Medizin V, Universitätsklinik Heidelberg, Heidelberg, Deutschland
| | - A Voigt
- Abteilung Rheumatologie, klinische Immunologie und Osteologie, Standort Berlin-Buch, Immanuel Krankenhaus Berlin, Berlin, Deutschland
| | - A Krause
- Abteilung Rheumatologie, klinische Immunologie und Osteologie, Standort Berlin-Buch, Immanuel Krankenhaus Berlin, Berlin, Deutschland
| | - O Sander
- Poliklinik und Funktionsbereich für Rheumatologie & Hiller Forschungszentrum Rheumatologie, UKD Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Deutschland
| | - M Schneider
- Poliklinik und Funktionsbereich für Rheumatologie & Hiller Forschungszentrum Rheumatologie, UKD Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Deutschland
| | | | - A Nigg
- MVZ MED
- BAYERN OST Altötting·Burghausen, Burghausen, Deutschland
| | - J Leipe
- Sektion Rheumatologie, V. Medizinische Klinik, Universitätsklinik Mannheim, Mannheim, Deutschland
| | - S Briem
- Innere Medizin und Rheumatologie, Alb-Donau Klinikum Langenau, Langenau, Deutschland
| | - E Tiessen
- Innere Medizin und Rheumatologie, Alb-Donau Klinikum Langenau, Langenau, Deutschland
| | - F Haas
- Rheumatologische Facharztpraxis, Tübingen, Deutschland
| | - M Rihl
- Rheumatologische Schwerpunktpraxis, Traunstein, Deutschland
| | - D Meyer-Olson
- m&i Fachklinik Bad Pyrmont und MVZ Weserbergland, Bad Pyrmont, Deutschland
| | - X Baraliakos
- Rheumazentrum Ruhrgebiet Herne, Ruhr-Universität Bochum, Bochum, Deutschland
| | - J Braun
- Rheumazentrum Ruhrgebiet Herne, Ruhr-Universität Bochum, Bochum, Deutschland
| | - A Schwarting
- Schwerpunkt Rheumatologie und klinische Immunologie, Universitätsmedizin der Johannes Gutenberg-Universität Mainz, Mainz, Deutschland.,ACURA Rheumakliniken Rheinland-Pfalz GmbH, Bad Kreuznach, Deutschland
| | - M Dreher
- Schwerpunkt Rheumatologie und klinische Immunologie, Universitätsmedizin der Johannes Gutenberg-Universität Mainz, Mainz, Deutschland
| | - T Witte
- Klinik für Immunologie und Rheumatologie, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - G Assmann
- Rheumatologie, Universitätsklinikum des Saarlandes, Homburg, Deutschland
| | - K Hoeper
- Regionales Kooperatives Rheumazentrum Niedersachsen e. V., Hannover, Deutschland
| | - R E Schmidt
- Klinik für Immunologie und Rheumatologie, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - P Bartz-Bazzanella
- Klinik für Internistische Rheumatologie, Rhein-Maas Klinikum, Würselen, Deutschland
| | - M Gaubitz
- Interdisziplinäre Diagnostik und Therapie - Akademie für Manuelle Medizin, WWU Münster, Münster, Deutschland
| | - C Specker
- Klinik für Rheumatologie und Klinische Immunologie, Evang. Krankenhaus Essen-Werden, Kliniken Essen-Mitte, Essen, Deutschland
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12
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Sakib S, Goldsmith T, Voigt A, Dobrinski I. Testicular organoids to study cell-cell interactions in the mammalian testis. Andrology 2019; 8:835-841. [PMID: 31328437 DOI: 10.1111/andr.12680] [Citation(s) in RCA: 13] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 06/03/2019] [Accepted: 06/19/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND Over the last ten years, three-dimensional organoid culture has garnered renewed interest, as organoids generated from primary cells or stem cells with cell associations and functions similar to organs in vivo can be a powerful tool to study tissue-specific cell-cell interactions in vitro. Very recently, a few interesting approaches have been put forth for generating testicular organoids for studying the germ cell niche microenvironment. AIM To review different model systems that have been employed to study germ cell biology and testicular cell-cell interactions and discuss how the organoid approach can address some of the shortcomings of those systems. RESULTS AND CONCLUSION Testicular organoids that bear architectural and functional similarities to their in vivo counterparts are a powerful model system to study cell-cell interactions in the germ cell niche. Organoids enable studying samples in humans and other large animals where in vivo experiments are not possible, allow modeling of testicular disease and malignancies and may provide a platform to design more precise therapeutic interventions.
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Affiliation(s)
- S Sakib
- Biochemistry & Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, AL, Canada.,Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AL, Canada
| | - T Goldsmith
- Biochemistry & Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, AL, Canada.,Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AL, Canada
| | - A Voigt
- Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AL, Canada
| | - I Dobrinski
- Biochemistry & Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, AL, Canada.,Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AL, Canada
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13
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Borcherding N, Voigt A, Liu V, Link B, Zhang W, Jabbari A. 169 Single-cell profiling of cutaneous T-cell lymphoma reveals underlying heterogeneity predicting disease progression. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.03.245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Affiliation(s)
- D. Wenzel
- Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany
| | - S. Praetorius
- Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany
| | - A. Voigt
- Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany
- Dresden Center for Computational Materials Science (DCMS), TU Dresden, 01062 Dresden, Germany
- Center for Systems Biology Dresden (CSBD), Pfotenhauerstr. 108, 01307 Dresden, Germany
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15
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Backofen R, Elder KR, Voigt A. Controlling Grain Boundaries by Magnetic Fields. Phys Rev Lett 2019; 122:126103. [PMID: 30978082 DOI: 10.1103/physrevlett.122.126103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Indexed: 06/09/2023]
Abstract
The ability to use external magnetic fields to influence the microstructure in polycrystalline materials has potential applications in microstructural engineering. To explore this potential and to understand the complex interactions between electromagnetic fields and solid-state matter transport we consider a phase-field-crystal model. Together with efficient and scalable numerical algorithms this allows the examination of the role that external magnetic fields play on the evolution of defect structures and grain boundaries, on diffusive timescales. Examples for planar and circular grain boundaries explain the essential atomistic processes and large scale simulations in 2D are used to obtain statistical data on grain growth under the influence of external fields.
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Affiliation(s)
- R Backofen
- Institute of Scientific Computing, Technische Universität Dresden, 01062 Dresden, Germany
| | - K R Elder
- Department of Physics, Oakland University, Rochester, Michigan 48309, USA
| | - A Voigt
- Institute of Scientific Computing, Technische Universität Dresden, 01062 Dresden, Germany
- Dresden Center for Computational Materials Science (DCMS), 01062 Dresden, Germany
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16
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Bakardjiev P, Voigt A, Marschner U, Altinsoy ME, Richter A. Improved Linear Network Models of Air Filled Tubes, Slits and Cavities. ACTA ACUST UNITED AC 2019. [DOI: 10.3813/aaa.919298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Böhmert L, König L, Sieg H, Lichtenstein D, Paul N, Braeuning A, Voigt A, Lampen A. In vitro nanoparticle dosimetry for adherent growing cell monolayers covering bottom and lateral walls. Part Fibre Toxicol 2018; 15:42. [PMID: 30376850 PMCID: PMC6208118 DOI: 10.1186/s12989-018-0278-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [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: 02/22/2018] [Accepted: 10/14/2018] [Indexed: 01/26/2023] Open
Abstract
Background Even though a continuously high number of in vitro studies on nanoparticles are being published, the issue of correct dose matter is often not sufficiently taken into account. Due to their size, the diffusion of nanoparticles is slower, as compared to soluble chemicals, and they sediment slowly. Therefore, the administered dose of particles in in vitro experiments is not necessarily the same (effective) dose that comes into contact with the cellular system. This can lead to misinterpretations of experimental toxic effects and disturbs the meaningfulness of in vitro studies. In silico calculations of the effective nanoparticle dose can help circumventing this problem. Results This study addresses more complex in vitro models like the human intestinal cell line Caco-2 or the human liver cell line HepaRG, which need to be differentiated over a few weeks to reach their full complexity. During the differentiation time the cells grow up the wall of the cell culture dishes and therefore a three-dimensional-based in silico model of the nanoparticle dose was developed to calculate the administered dose received by different cell populations at the bottom and the walls of the culture dish. Moreover, the model can perform calculations based on the hydrodynamic diameter which is measured by light scattering methods, or based on the diffusion coefficient measured by nanoparticle tracking analysis (NTA). This 3DSDD (3D-sedimentation-diffusion-dosimetry) model was experimentally verified against existing dosimetry models and was applied to differentiated Caco-2 cells incubated with silver nanoparticles. Conclusions The 3DSDD accounts for the 3D distribution of cells in in vitro cell culture dishes and is therefore suitable for differentiated cells. To encourage the use of dosimetry calculating software, our model can be downloaded from the supporting information. Electronic supplementary material The online version of this article (10.1186/s12989-018-0278-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Linda Böhmert
- Department of Food Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany.
| | - Laura König
- Chair of Process Systems Engineering, Otto-von-Guericke University Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany
| | - Holger Sieg
- Department of Food Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Dajana Lichtenstein
- Department of Food Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Niklas Paul
- Technische Universität Berlin, Fachgebiet Verfahrenstechnik, Ackerstraße 71-76, 13355, Berlin, Germany
| | - Albert Braeuning
- Department of Food Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
| | - Andreas Voigt
- Chair of Process Systems Engineering, Otto-von-Guericke University Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany
| | - Alfonso Lampen
- Department of Food Safety, German Federal Institute for Risk Assessment, Max-Dohrn-Str. 8-10, 10589, Berlin, Germany
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18
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Voigt A, Seipelt E, Bastian H, Juche A, Krause A. [Improved early diagnostics of rheumatic diseases : Monocentric experiences with an open rheumatological specialist consultation]. Z Rheumatol 2018; 77:844-849. [PMID: 30255411 DOI: 10.1007/s00393-018-0540-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
AIM OF THE PROJECT To establish an open rheumatological outpatient consultation service for early diagnosis of inflammatory rheumatic diseases and initiation of further diagnostics and treatment. METHODS In 2015 an open consultation service was initiated for patients with signs of an early rheumatic disease after referral by primary care physicians. Patients could attend once a week without the need for a prior appointment if they fulfilled at least one of the following criteria: positive rheumatoid factor, increased CRP, anti-CCP antibody or antinuclear antibody, joint pain or back pain for over 3 months, swollen joints, fever of unknown origin or acute muscle pain with or without headache of unknown origin. This article presents the results of the retrospective descriptive data analysis of the first 2 years of this project. RESULTS A total of 1262 patients were treated with an average of approximately 20 patients per consultation. In nearly half of the patients an inflammatory rheumatological disease could be diagnosed and immediate diagnostic and treatment measures could be initiated. The diagnostic delay for patients with rheumatoid arthritis was 12 weeks, for patients with polymyalgia rheumatica 11 weeks and for patients with psoriatic arthritis or axial spondylarthritis 18 and 44 weeks, respectively. The time expenditure was a total of 4-5 h per week for an experienced rheumatologist and a specialized rheumatology nurse. CONCLUSION Through this open rheumatological outpatient consultation a low threshold opportunity for the early diagnosis of rheumatologic diseases could be established. The diagnostic delay for many rheumatological diseases could be considerably shortened. Cooperation with rheumatologists in private practice guaranteed the subsequent specialized rheumatological care of the identified patients in the early stages of their illness.
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Affiliation(s)
- A Voigt
- Standort Berlin Buch, Immanuel Krankenhaus Berlin, Lindenberger Weg 19, 13125, Berlin, Deutschland.
| | - E Seipelt
- Standort Berlin Buch, Immanuel Krankenhaus Berlin, Lindenberger Weg 19, 13125, Berlin, Deutschland
| | - H Bastian
- Standort Berlin Buch, Immanuel Krankenhaus Berlin, Lindenberger Weg 19, 13125, Berlin, Deutschland
| | - A Juche
- Standort Berlin Buch, Immanuel Krankenhaus Berlin, Lindenberger Weg 19, 13125, Berlin, Deutschland
| | - A Krause
- Standort Berlin Buch, Immanuel Krankenhaus Berlin, Lindenberger Weg 19, 13125, Berlin, Deutschland
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19
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Wiedmeyer V, Voigt A, Anker F, John V, Ahrens R, Le Borne S, Sundmacher A. Kontinuierliche formselektive Kristallisation: Neue Strategien. CHEM-ING-TECH 2018. [DOI: 10.1002/cite.201855145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- V. Wiedmeyer
- Otto-von-Guericke-Universität Magdeburg; Systemverfahrenstechnik; Uniplatz 2 39106 Magdeburg Deutschland
| | - A. Voigt
- Otto-von-Guericke-Universität Magdeburg; Systemverfahrenstechnik; Uniplatz 2 39106 Magdeburg Deutschland
| | - F. Anker
- Weierstraß-Institut für Angewandte Analysis und Stochastik; Numerische Mathematik; Mohrenstraße 39 10117 Berlin Deutschland
| | - V. John
- Weierstraß-Institut für Angewandte Analysis und Stochastik; Numerische Mathematik; Mohrenstraße 39 10117 Berlin Deutschland
- Freie Universität Berlin; Mathematik und Computerwissenschaften; Arnimallee 6 14195 Berlin Deutschland
| | - R. Ahrens
- Technische Universität Hamburg; Numerische Mathematik; Am Schwarzenberg-Campus 3 21073 Hamburg Deutschland
| | - S. Le Borne
- Technische Universität Hamburg; Numerische Mathematik; Am Schwarzenberg-Campus 3 21073 Hamburg Deutschland
| | - A. Sundmacher
- Otto-von-Guericke-Universität Magdeburg; Systemverfahrenstechnik; Uniplatz 2 39106 Magdeburg Deutschland
- Max-Planck-Institut für Dynamik komplexer technischer Systeme Magdeburg; Prozesstechnik; Sandtorstraße 1 39106 Magdeburg Deutschland
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20
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Voigt A, Schleussner E, Schneppenheim R, Budde U, Beck JF, Stefanska-Windyga E, Windyga J, Kentouche K. Pregnancy in Upshaw-Schulman syndrome. Hamostaseologie 2018; 33:144-8. [DOI: 10.5482/hamo-13-04-0025] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 05/06/2013] [Indexed: 11/05/2022] Open
Abstract
SummaryThe Upshaw Schulman syndrome (MIM #274150) is a hereditary deficiency of the von Willebrand factor cleaving protease (ADAMTS13) due to homozygous or compound heterozygous mutations in the ADAMTS13 gene. Patients are prone to bouts of thrombotic thrombocytopenic purpura. However, disease manifestation needs a second trigger event. Pregnancy is a known risk factor for TTP. Patients with USS may manifest during pregnancy and the postpartum period or relapse with a TTP bout. Before plasma therapy mortality for both the mother and the fetus was high, but even nowadays when plasma is delivered, therapy is challenging, still bearing a high risk for miscarriage or long term sequelae for the mother.In this report on pregnancies in three mothers with USS, plasma therapy was increased in frequency and amount given with regard to platelet count or ADAMTS13 activity, thus leading to a successful outcome.
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21
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Franke M, Slowik I, Mehner PJ, Paschew G, Voigt A, Fröb H, Leo K, Richter A. Electrically Tunable Dye Emission via Microcavity Integrated PDMS Gel Actuator. ACS Appl Mater Interfaces 2017; 9:29193-29202. [PMID: 28783313 DOI: 10.1021/acsami.7b06570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Electrically tunable microcavities are essential elements for tunable laser sources indispensable for modern telecommunication and spectroscopy. However, most device concepts suffer from extensive lithography or etching for membrane processing. Here, we present an electrically and continuously tunable, multi-half-wavelength microcavity with a quality factor > 1000 as an easy-to-fabricate platform with potential use for vertical-cavity surface-emitting lasers. The microcavity has a Fabry-Pérot structure consisting of ultrasoft PDMS gel with a thickness of 14-15 μm and capped by a distributed Bragg reflector on the bottom end and a silver layer serving as top mirror and electrode. Additionally, we have embedded a pyrromethene dye into the PDMS matrix to prove efficient gain medium integration. By means of an integrated dielectric elastomer actuator, the microcavity thickness is varied 1.3 μm (9%) with a driving voltage of 70 V. The subsequent silver mirror deflection achieves a reversible 40 nm tuning of the cavity resonance wavelength. The tuning range is limited by the lateral bending of the electrodes for increasing voltages. This characteristic bending is confirmed by simulations with finite elements method. The dynamic behavior of the microcavity is characterized by capacitance measurements and modeled by viscoelastic theory. Our research provides in-depth examinations of electrically tunable, PDMS gel-based microcavities with the future goal of building simple, miniaturized, and cost-efficient laser sources with high tuning range.
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Affiliation(s)
- Markus Franke
- Chair of Polymeric Microsystems, Institute of Semiconductors and Microsystems (IHM), Technische Universität Dresden , 01062 Dresden, Germany
| | - Irma Slowik
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden , 01062 Dresden, Germany
| | - Philipp J Mehner
- Chair of Polymeric Microsystems, Institute of Semiconductors and Microsystems (IHM), Technische Universität Dresden , 01062 Dresden, Germany
| | - Georgi Paschew
- Chair of Polymeric Microsystems, Institute of Semiconductors and Microsystems (IHM), Technische Universität Dresden , 01062 Dresden, Germany
| | - Andreas Voigt
- Chair of Polymeric Microsystems, Institute of Semiconductors and Microsystems (IHM), Technische Universität Dresden , 01062 Dresden, Germany
| | - Hartmut Fröb
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden , 01062 Dresden, Germany
| | - Karl Leo
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden , 01062 Dresden, Germany
| | - Andreas Richter
- Chair of Polymeric Microsystems, Institute of Semiconductors and Microsystems (IHM), Technische Universität Dresden , 01062 Dresden, Germany
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22
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Affiliation(s)
- Viktoria Wiedmeyer
- Otto von Guericke University Magdeburg; Faculty of Process & Systems Engineering; Universitätsplatz 2 39106 Magdeburg Germany
| | - Andreas Voigt
- Otto von Guericke University Magdeburg; Faculty of Process & Systems Engineering; Universitätsplatz 2 39106 Magdeburg Germany
| | - Kai Sundmacher
- Otto von Guericke University Magdeburg; Faculty of Process & Systems Engineering; Universitätsplatz 2 39106 Magdeburg Germany
- Max Planck Institute for Dynamics of Complex Technical Systems; Process Systems Engineering; Sandtorstr. 1 39106 Magdeburg Germany
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23
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Helmer D, Voigt A, Wagner S, Keller N, Sachsenheimer K, Kotz F, Nargang TM, Rapp BE. Suspended Liquid Subtractive Lithography: One-step generation of 3D channel geometries in viscous curable polymer matrices. Sci Rep 2017; 7:7387. [PMID: 28785064 PMCID: PMC5547044 DOI: 10.1038/s41598-017-07630-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 07/03/2017] [Indexed: 11/20/2022] Open
Abstract
The miniaturization of synthesis, analysis and screening experiments is an important step towards more environmentally friendly chemistry, statistically significant biology and fast and cost-effective medicinal assays. The facile generation of arbitrary 3D channel structures in polymers is pivotal to these techniques. Here we present a method for printing microchannels directly into viscous curable polymer matrices by injecting a surfactant into the uncured material via a steel capillary attached to a 3D printer. We demonstrate this technique using polydimethylsiloxane (PDMS) one of the most widely used polymers for the fabrication of, e. g. microfluidic chips. We show that this technique which we term Suspended Liquid Subtractive Lithography (SLSL) is well suited for printing actuators, T-junctions and complex three dimensional structures. The formation of truly arbitrary channels in 3D could revolutionize the fabrication of miniaturized chips and will find broad application in biology, chemistry and medicine.
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Affiliation(s)
- D Helmer
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - A Voigt
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - S Wagner
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - N Keller
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - K Sachsenheimer
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - F Kotz
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - T M Nargang
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - B E Rapp
- Karlsruhe Institute of Technology, Institute of Microstructure Technology IMT, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
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24
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Wiedmeyer V, Anker F, Bartsch C, Voigt A, John V, Sundmacher K. Continuous Crystallization in a Helically Coiled Flow Tube: Analysis of Flow Field, Residence Time Behavior, and Crystal Growth. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b04279] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Viktoria Wiedmeyer
- Department
Process Systems Engineering, Otto-von-Guericke-University Magdeburg, Universitätsplatz
2, D-39106 Magdeburg, Germany
| | - Felix Anker
- Weierstrass
Institute for Applied Analysis and Stochastics, Leibniz Institute in Forschungsverbund Berlin e. V. (WIAS), Mohrenstr. 39, D-10117 Berlin, Germany
| | - Clemens Bartsch
- Weierstrass
Institute for Applied Analysis and Stochastics, Leibniz Institute in Forschungsverbund Berlin e. V. (WIAS), Mohrenstr. 39, D-10117 Berlin, Germany
| | - Andreas Voigt
- Department
Process Systems Engineering, Otto-von-Guericke-University Magdeburg, Universitätsplatz
2, D-39106 Magdeburg, Germany
| | - Volker John
- Weierstrass
Institute for Applied Analysis and Stochastics, Leibniz Institute in Forschungsverbund Berlin e. V. (WIAS), Mohrenstr. 39, D-10117 Berlin, Germany
- Department
of Mathematics and Computer Science, Free University of Berlin, Arnimallee 6, D-14195 Berlin, Germany
| | - Kai Sundmacher
- Department
Process Systems Engineering, Otto-von-Guericke-University Magdeburg, Universitätsplatz
2, D-39106 Magdeburg, Germany
- Department
Process Systems Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstr. 1, D-39106 Magdeburg, Germany
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25
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Bräuer M, Voigt A, Hartmann P. Verbesserung der Weiterbildung zum Facharzt durch ein Logbuch-unterstütztes Rotationssystem unter Supervision fachärztlicher Mentoren. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1592743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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26
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Abstract
We consider a generic model for cell motility. Even if a comprehensive understanding of cell motility remains elusive, progress has been achieved in its modelling using a whole-cell physical model. The model takes into account the main mechanisms of cell motility, actin polymerization, actin-myosin dynamics and substrate mediated adhesion (if applicable), and combines them with steric cell-cell and hydrodynamic interactions. The model predicts the onset of collective cell migration, which emerges spontaneously as a result of inelastic collisions of neighbouring cells. Each cell here modelled as an active polar gel is accomplished with two vortices if it moves. Upon collision of two cells, the two vortices which come close to each other annihilate. This leads to a rotation of the cells and together with the deformation and the reorientation of the actin filaments in each cell induces alignment of these cells and leads to persistent translational collective migration. The effect for low Reynolds numbers is as strong as in the non-hydrodynamic model, but it decreases with increasing Reynolds number.
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Affiliation(s)
- W Marth
- Institut für Wissenschaftliches Rechnen , TU Dresden , 01062 Dresden , Germany
| | - A Voigt
- Institut für Wissenschaftliches Rechnen, TU Dresden, 01062 Dresden, Germany; Dresden Center for Computational Materials Science (DCMS), TU Dresden, 01062 Dresden, Germany; Center for Systems Biology Dresden (CSBD), Pfotenhauerstr. 108, 01307 Dresden, Germany
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27
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Voigt A, Freund R, Heck J, Missler M, Obermair GJ, Thomas U, Heine M. Dynamic association of calcium channel subunits at the cellular membrane. Neurophotonics 2016; 3:041809. [PMID: 27872869 PMCID: PMC5093230 DOI: 10.1117/1.nph.3.4.041809] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 10/10/2016] [Indexed: 05/25/2023]
Abstract
High voltage gated calcium channels (VGCCs) are composed of at least three subunits, one pore forming [Formula: see text]-subunit, an intracellular [Formula: see text]-variant, and a mostly extracellular [Formula: see text]-variant. Interactions between these subunits determine the kinetic properties of VGCCs. It is unclear whether these interactions are stable over time or rather transient. Here, we used single-molecule tracking to investigate the surface diffusion of [Formula: see text]- and [Formula: see text]-subunits at the cell surface. We found that [Formula: see text]-subunits show higher surface mobility than [Formula: see text]-subunits, and that they are only transiently confined together, suggesting a weak association between [Formula: see text]- and [Formula: see text]-subunits. Moreover, we observed that different [Formula: see text]-subunits engage in different degrees of association with the [Formula: see text]-subunit, revealing the tighter interaction of [Formula: see text] with [Formula: see text]. These data indicate a distinct regulation of the [Formula: see text] interaction in VGCC subtypes. We modeled their membrane dynamics in a Monte Carlo simulation using experimentally determined diffusion constants. Our modeling predicts that the ratio of associated [Formula: see text]- and [Formula: see text]-subunits mainly depends on their expression density and confinement in the membrane. Based on the different motilities of particular [Formula: see text]-subunit combinations, we propose that their dynamic assembly and disassembly represent an important mechanism to regulate the signaling properties of VGCC.
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Affiliation(s)
- Andreas Voigt
- Otto-von-Guericke-University of Magdeburg, Lehrstuhl Systemverfahrenstechnik, Universitätsplatz 2, Magdeburg D-39106, Germany
| | - Romy Freund
- Leibniz-Institute of Neurobiology, Research Group Molecular Physiology, Brenneckestrasse 6, Magdeburg D-39118, Germany
| | - Jennifer Heck
- Leibniz-Institute of Neurobiology, Research Group Molecular Physiology, Brenneckestrasse 6, Magdeburg D-39118, Germany
| | - Markus Missler
- Westfälische Wilhelms-University, Institute of Anatomy and Molecular Neurobiology, Vesaliusweg 2, Münster 48149, Germany
| | - Gerald J. Obermair
- Medical University Innsbruck, Division of Physiology, Department of Physiology and Medical Physics, Schöpfstrasse 41, Innsbruck 6020, Austria
| | - Ulrich Thomas
- Leibniz-Institute of Neurobiology, Department Neurochemistry, Brenneckestrasse 6, Magdeburg D-39118, Germany
| | - Martin Heine
- Leibniz-Institute of Neurobiology, Research Group Molecular Physiology, Brenneckestrasse 6, Magdeburg D-39118, Germany
- Otto-von-Guericke-University Magdeburg, Center for Behavioral Brain Sciences (CBBS), Universitätsplatz 2, Magdeburg D-39106, Germany
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28
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Fricke M, Voigt A, Sundmacher K. Shaping without Touching: ZnO Nanoparticle Production in Miniemulsions. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650457] [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: 11/11/2022]
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Wang W, Voigt A, Sundmacher K. The interaction of protein-coated bionanoparticles and surface receptors reevaluated: how important is the number of bonds? Soft Matter 2016; 12:6451-6462. [PMID: 27411954 DOI: 10.1039/c6sm00995f] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Specifically designed bionanoparticles with a function-oriented protein-coating layer interact with self-prepared receptor surfaces as the counterpart. Based on surface plasmon resonance biosensing experiments, a model framework is validated to estimate the number of bonds formed between these bionanoparticles and the receptor surface based on multivalent interactions. Our multi-site kinetic model is able to analyze the adsorption rate constants and the number of bonds from experimental data of natural and synthetic bionanoparticles. The influence of the mass transport on the adsorption kinetics is modeled including a diffusional boundary layer where a helpful analytical solution has been derived. Our model framework extends previous studies to include a higher number of bonds, ranging from 1 up to 1000. An almost linear relationship between the number of bonds and the adsorption amount of bionanoparticles makes the model framework suitable to predict, for example, ligand density and to further assess coating performance. The proposed model framework can serve as a design tool for multivalent interaction experiments under variable process conditions.
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Affiliation(s)
- Wenjing Wang
- Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstraße 1, D-39106 Magdeburg, Germany.
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Wang W, Voigt A, Wolff MW, Reichl U, Sundmacher K. Binding kinetics and multi-bond: Finding correlations by synthesizing interactions between ligand-coated bionanoparticles and receptor surfaces. Anal Biochem 2016; 505:8-17. [PMID: 27108189 DOI: 10.1016/j.ab.2016.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 11/23/2015] [Revised: 03/08/2016] [Accepted: 04/03/2016] [Indexed: 12/11/2022]
Abstract
The number of bonds formed between one single bionanoparticle and many surface receptors is an important subject to be studied but is seldom quantitatively investigated. A new evaluation of the correlation between binding kinetics and number of bonds is presented by varying ligand density and receptor density. An experimental system was developed using measurements with surface plasmon resonance spectroscopy. A corresponding multi-site adsorption model elucidated the correlation. The results show that with the increase of the receptor density, the adsorption rate first decreased when the number of bonds was below a maximum value and then increased when the number of bonds stayed at this maximum value. The investigation on ligand density variation suggests that the coating density on top of the bionanoparticle surface may have a particular value below which more ligand will accelerate the adsorption rate. The ratio of ligand amount bound by the receptors to the total ligand amount associated with a single bionanoparticle will remain constant even if one attaches more ligands to a bionanoparticle. We envision that the bionanoparticle desorption will not depend on density changes from either ligand or receptor when the number of bonds reaches a specific efficient value.
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Affiliation(s)
- Wenjing Wang
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany.
| | - Andreas Voigt
- Chair for Process Systems Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
| | - Michael W Wolff
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany; Chair for Bioprocess Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
| | - Udo Reichl
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany; Chair for Bioprocess Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
| | - Kai Sundmacher
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany; Chair for Process Systems Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
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Abstract
We analyse a generic motility model, with the motility mechanism arising by contractile stress due to the interaction of myosin and actin. A hydrodynamic active polar gel theory is used to model the cytoplasm of a cell and is combined with a Helfrich-type model to account for membrane properties. The overall model allows consideration of the motility without the necessity for local adhesion. Besides a detailed numerical approach together with convergence studies for the highly nonlinear free boundary problem, we also compare the induced flow field of the motile cell with that of classical squirmer models and identify the motile cell as a puller or pusher, depending on the strength of the myosin-actin interactions.
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Affiliation(s)
- W Marth
- Institut für Wissenschaftliches Rechnen, TU Dresden, Dresden 01062, Germany
| | - S Praetorius
- Institut für Wissenschaftliches Rechnen, TU Dresden, Dresden 01062, Germany
| | - A Voigt
- Institut für Wissenschaftliches Rechnen, TU Dresden, Dresden 01062, Germany
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Abstract
Neurons encode information in fast changes of the membrane potential, and thus electrical membrane properties are critically important for the integration and processing of synaptic inputs by a neuron. These electrical properties are largely determined by ion channels embedded in the membrane. The distribution of most ion channels in the membrane is not spatially uniform: they undergo activity-driven changes in the range of minutes to days. Even in the range of milliseconds, the composition and topology of ion channels are not static but engage in highly dynamic processes including stochastic or activity-dependent transient association of the pore-forming and auxiliary subunits, lateral diffusion, as well as clustering of different channels. In this review we briefly discuss the potential impact of mobile sodium, calcium and potassium ion channels and the functional significance of this for individual neurons and neuronal networks.
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Affiliation(s)
- Martin Heine
- a RG Molecular Physiology, Leibniz Institute for Neurobiology, Center for Behavioral Brain Science, Otto-von-Guericke-University of Magdeburg , Magdeburg , Germany
| | - Anna Ciuraszkiewicz
- a RG Molecular Physiology, Leibniz Institute for Neurobiology, Center for Behavioral Brain Science, Otto-von-Guericke-University of Magdeburg , Magdeburg , Germany
| | - Andreas Voigt
- b Lehrstuhl Systemverfahrenstechnik, Otto-von-Guericke-University of Magdeburg , Magdeburg , Germany
| | - Jennifer Heck
- a RG Molecular Physiology, Leibniz Institute for Neurobiology, Center for Behavioral Brain Science, Otto-von-Guericke-University of Magdeburg , Magdeburg , Germany
| | - Arthur Bikbaev
- a RG Molecular Physiology, Leibniz Institute for Neurobiology, Center for Behavioral Brain Science, Otto-von-Guericke-University of Magdeburg , Magdeburg , Germany
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33
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Affiliation(s)
- Michael Fricke
- Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany
- Process
Systems Engineering, Otto-von-Guericke University Magdeburg, 39106 Magdeburg, Germany
| | - Andreas Voigt
- Process
Systems Engineering, Otto-von-Guericke University Magdeburg, 39106 Magdeburg, Germany
| | - Peter Veit
- Institute
for Experimental Physics, Otto-von-Guericke University Magdeburg, 39106 Magdeburg, Germany
| | - Kai Sundmacher
- Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany
- Process
Systems Engineering, Otto-von-Guericke University Magdeburg, 39106 Magdeburg, Germany
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34
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Soultanova A, Panneck A, Rafiq A, Schütz B, Chubanov V, Gudermann T, Weihe E, Krasteva-Christ G, Müller-Redetzky H, Witzenrath M, Voigt A, Meyerhof W, Kummer W. Chemosensory cholinergic signaling network in the thymic medullary epithelium. Pneumologie 2015. [DOI: 10.1055/s-0035-1556632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Krasteva-Christ G, Soultanova A, Schütz B, Papadakis T, Weiss C, Deckmann K, Chubanov V, Gudermann T, Voigt A, Meyerhof W, Boehm U, Weihe E, Kummer W. Identification of cholinergic chemosensory cells in mouse tracheal and laryngeal glandular ducts. Int Immunopharmacol 2015; 29:158-65. [PMID: 26033492 DOI: 10.1016/j.intimp.2015.05.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 04/27/2015] [Accepted: 05/18/2015] [Indexed: 11/19/2022]
Abstract
Specialized epithelial cells in the respiratory tract such as solitary chemosensory cells and brush cells sense the luminal content and initiate protective reflexes in response to the detection of potentially harmful substances. The majority of these cells are cholinergic and utilize the canonical taste signal transduction cascade to detect "bitter" substances such as bacterial quorum sensing molecules. Utilizing two different mouse strains reporting expression of choline acetyltransferase (ChAT), the synthesizing enzyme of acetylcholine (ACh), we detected cholinergic cells in the submucosal glands of the murine larynx and trachea. These cells were localized in the ciliated glandular ducts and were neither found in the collecting ducts nor in alveolar or tubular segments of the glands. ChAT expression in tracheal gland ducts was confirmed by in situ hybridization. The cholinergic duct cells expressed the brush cell marker proteins, villin and cytokeratin-18, and were immunoreactive for components of the taste signal transduction cascade (Gα-gustducin, transient receptor potential melastatin-like subtype 5 channel = TRPM5, phospholipase C(β2)), but not for carbonic anhydrase IV. Furthermore, these cells expressed the bitter taste receptor Tas2r131, as demonstrated utilizing an appropriate reporter mouse strain. Our study identified a previously unrecognized presumptive chemosensory cell type in the duct of the airway submucosal glands that likely utilizes ACh for paracrine signaling. We propose that these cells participate in infection-sensing mechanisms and initiate responses assisting bacterial clearance from the lower airways.
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Affiliation(s)
- G Krasteva-Christ
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany; Institute of Anatomy and Cell Biology, Julius-Maximilians-University, Wuerzburg, Germany.
| | - A Soultanova
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany
| | - B Schütz
- Institute for Anatomy and Cell Biology, Philipps-University, Marburg, Germany
| | - T Papadakis
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany
| | - C Weiss
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany
| | - K Deckmann
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany
| | - V Chubanov
- Walter-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, Munich, Germany
| | - T Gudermann
- Walter-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilian-University, Munich, Germany
| | - A Voigt
- Dept. Molecular Genetics, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - W Meyerhof
- Dept. Molecular Genetics, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - U Boehm
- Department of Pharmacology and Toxicology, University of Saarland School of Medicine, Homburg, Germany
| | - E Weihe
- Institute for Anatomy and Cell Biology, Philipps-University, Marburg, Germany
| | - W Kummer
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany
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36
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Schneider R, Hosy E, Kohl J, Klueva J, Choquet D, Thomas U, Voigt A, Heine M. Mobility of calcium channels in the presynaptic membrane. Neuron 2015; 86:672-9. [PMID: 25892305 DOI: 10.1016/j.neuron.2015.03.050] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 02/03/2015] [Accepted: 03/09/2015] [Indexed: 12/20/2022]
Abstract
Unravelling principles underlying neurotransmitter release are key to understand neural signaling. Here, we describe how surface mobility of voltage-dependent calcium channels (VDCCs) modulates release probabilities (P(r)) of synaptic vesicles (SVs). Coupling distances of <10 to >100 nm have been reported for SVs and VDCCs in different synapses. Tracking individual VDCCs revealed that within hippocampal synapses, ∼60% of VDCCs are mobile while confined to presynaptic membrane compartments. Intracellular Ca(2+) chelation decreased VDCC mobility. Increasing VDCC surface populations by co-expression of the α2δ1 subunit did not alter channel mobility but led to enlarged active zones (AZs) rather than higher channel densities. VDCCs thus scale presynaptic scaffolds to maintain local mobility. We propose that dynamic coupling based on mobile VDCCs supports calcium domain cooperativity and tunes neurotransmitter release by equalizing Pr for docked SVs within AZs.
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Affiliation(s)
- Romy Schneider
- Molecular Physiology Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany
| | - Eric Hosy
- University of Bordeaux, F-33000 Bordeaux, France; CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297, F-33000 Bordeaux, France
| | - Johannes Kohl
- Harvard University, Department Molecular and Cellular Biology, Cambridge, MA 02138, USA
| | - Julia Klueva
- Molecular Physiology Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany; Presynaptic Plasticity Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany
| | - Daniel Choquet
- University of Bordeaux, F-33000 Bordeaux, France; CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297, F-33000 Bordeaux, France; Bordeaux Imaging Center, UMS 3420 CNRS, US4 INSERM, University of Bordeaux, F-33000 Bordeaux, France
| | - Ulrich Thomas
- Department Neurochemistry, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany
| | - Andreas Voigt
- Otto-von-Guericke-University Magdeburg, Systemverfahrenstechnik, Universitätsplatz 2, D-39106 Magdeburg, Germany
| | - Martin Heine
- Molecular Physiology Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany.
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Affiliation(s)
- Anna Lautenschleger
- Chair of Fluid Process Engineering, Faculty of Mechanical Engineering; University of Paderborn; Pohlweg 55 D-33098 Paderborn Germany
| | - Eugeny Y. Kenig
- Chair of Fluid Process Engineering, Faculty of Mechanical Engineering; University of Paderborn; Pohlweg 55 D-33098 Paderborn Germany
- Gubkin Russian State University of Oil and Gas; Leninsky Prospect 65 119991 Moscow Russian Federation
| | - Andreas Voigt
- Otto-von-Guericke-University Magdeburg, Process Systems Engineering; Universitätsplatz 2 D-39106 Magdeburg Germany
- Max-Planck Institute for Dynamics of Complex Technical Systems; Sandtorstrasse 1 D-39106 Magdeburg Germany
| | - Kai Sundmacher
- Otto-von-Guericke-University Magdeburg, Process Systems Engineering; Universitätsplatz 2 D-39106 Magdeburg Germany
- Max-Planck Institute for Dynamics of Complex Technical Systems; Sandtorstrasse 1 D-39106 Magdeburg Germany
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38
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Nangolo HT, Roberto L, Segamwenge IL, Voigt A, Kidaaga F. Spinal cord compression: an unusual presentation of hepatocellular carcinoma. Pan Afr Med J 2014; 19:363. [PMID: 25932076 PMCID: PMC4407935 DOI: 10.11604/pamj.2014.19.363.4323] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 04/06/2014] [Accepted: 11/25/2014] [Indexed: 01/10/2023] Open
Abstract
Hepatocellular carcinoma is the 5th most common cancer in men and the 2nd common cause of death from cancer worldwide. The tumour commonly metastasizes to the lungs, regional lymph nodes and bone. Spinal cord compression secondary to metastatic disease as a first presentation is uncommon. We describe a patient who presented with paraplegia as a first presentation of hepatocellular carcinoma. 46 year old Namibian man presented with progressive leg weakness that was associated with a dull back ache and inability to pass urine and stool. He had no history of trauma nor did he have chronic cough, night sweats or fevers. He has been treated several times for alcohol dependence. On examination he was wasted, power 0/5 in both lower limbs and a sensory level at T12. He also had a non-tender hepatomegaly with Alpha-fetoprotein of 2000. The Chest X-ray and Chest CT showed nodular opacities indicating metastatic disease and the X-ray and CT of the thoracic spine showed osteolytic lesion with destruction of the pedicle of L1. Liver and spinal biopsy confirmed the hepatocellular carcinoma. The extra hepatic manifestations of HCC are diverse and Spinal cord metastasis is of pertinent clinical importance and should thus be greatly considered.
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Affiliation(s)
| | - Larrea Roberto
- Department of Internal Medicine, Intermediate Hospital Oshakati, Oshakati, Namibia
| | | | - Andreas Voigt
- Department Orthopedic Surgery, Intermediate Hospital Oshakati, Oshakati, Namibia
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39
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Wang W, Voigt A, Wolff M, Reichl U, Sundmacher K. Adsorption in einer Affinitätsmembran: Ein Ansatz mittels synthetischer Biologie. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201450307] [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: 11/05/2022]
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40
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Voigt A, Possehl A, Klingel K, Rahnefeld A. P625An insight into the function of immunoproteasomes in immunmodulation: induction of the pattern recognition factor Pentraxin 3 in acute cardiac inflammation. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu098.53] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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41
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Leßmann F, Beyer L, Hallmeier KH, Richter R, Sieler J, Strauch P, Voigt A. Vierzähnige Benzamidin-Liganden in ein-und mehrkemigen Kupfer(II)-Komplexen / Quadridentate Benzamidine Ligands in Mono-and Oligonuclear Copper(II) Complexes. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-2000-3-405] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Bridged N-thiocarbamoyl substituted bis-benzamidines (C2H5)2N-C(S)-N=C(Ph)-NH-R-NH-C(Ph)=N-C(S)-N(C2H5)2 with different moieties R (H2L1 : R = diphenylmethane-2,2'-diyl, H2 L2: R = diphenylmethane-3,3'-diyl, and H2L3: R = diphenylmethane-4,4'-diyl) were synthesized by the reaction of N-(thiocarbamoyl)benzimidoyl chlorides with diamines. These quadri dentate ligands form neutral mononuclear (CuL1), dinuclear (Cu2L3
2) and trinuclear (Cu3L2
3) copper(II) chelates in dependence of the different bridging unit in the ligands. The compounds were characterized by NMR, IR, EPR and XPS spectroscopy and FAB mass spectrometry. The molecular structures of the ligand H2L3 and the complex CuL1 have been determined by X-ray methods.
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Affiliation(s)
- F. Leßmann
- Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Johannisallee 29, D-04103 Leipzig
| | - L. Beyer
- Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Johannisallee 29, D-04103 Leipzig
| | - K.-H. Hallmeier
- Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Johannisallee 29, D-04103 Leipzig
| | - R. Richter
- Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Johannisallee 29, D-04103 Leipzig
| | - J. Sieler
- Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Johannisallee 29, D-04103 Leipzig
| | - P. Strauch
- Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Johannisallee 29, D-04103 Leipzig
| | - A. Voigt
- Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Anorganische Chemie, Johannisallee 29, D-04103 Leipzig
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42
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Voigt A, Abram U, Kirmse R. Zur Existenz von [ReNCl4-nFn]- (n = 1-3) Nitridorhenat(VI)-Gemischt- ligandkomplexen -Eine EPR-Untersuchung / EPR Evidence of [ReNCl4-n FnJ– (n = 1-3) Nitridorhenate(VI) Mixed-Ligand Complexes. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-1998-1013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The formation of mixed-ligand complexes of the type [ReVlNCl4-nFn]- (n = 1 -3) during the reaction of [ReVINCl4]- with [n-(C4H9)4N]F, KF, and HF is reported. Evidence of the individual mixed-ligand compounds is given by their EPR spectral data. In frozen solutions a specific dependence of the EPR data on the composition of the coordination sphere could be detected. This is shown (i) by a nearly linear dependence of gII and AII Re on the Cl/F-content of the [ReVINCl4-nFn]- unit (additivity rules) and (ii) by well-resolved 19F hyperfine splittings.
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Affiliation(s)
- Andreas Voigt
- Institut für Anorganische Chemie der Universität Leipzig, Talstr. 35, D-04103 Leipzig
| | - Ulrich Abram
- Forschungszentrum Rossendorf, Institut für Radiochemie, c/o Technische Universität Dresden, Institut für Analytische Chemie, D-01062 Dresden
| | - Reinhard Kirmse
- Institut für Anorganische Chemie der Universität Leipzig, Talstr. 35, D-04103 Leipzig
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Affiliation(s)
| | - B. Dzikiti
- Section of AnaesthesiologyDepartment of Companion Animal Clinical StudiesFaculty of Veterinary ScienceUniversity of PretoriaPrivate Bag X04Onderstepoort0110South Africa
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Xiong Y, Liu ZZ, Georgieva R, Smuda K, Steffen A, Sendeski M, Voigt A, Patzak A, Bäumler H. Nonvasoconstrictive hemoglobin particles as oxygen carriers. ACS Nano 2013; 7:7454-7461. [PMID: 23915101 DOI: 10.1021/nn402073n] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Artificial oxygen carriers, favorably hemoglobin-based oxygen carriers (HBOCs), are being investigated intensively during the last 30 years with the aim to develop a universal blood substitute. However, serious side effects mainly caused by vasoconstriction triggered by nitric oxide (NO) scavenging due to penetration of nanosized HBOCs through the endothelial gaps of the capillary walls and/or oxygen oversupply in the precapillary arterioles due to their low oxygen affinity led to failure of clinical trials and FDA disapproval. To avoid these effects, HBOCs with a size between 100 and 1000 nm and high oxygen affinity are needed. Here we present for the first time unique hemoglobin particles (HbPs) of around 700 nm with high oxygen affinity and low immunogenicity using a novel, highly effective, and simple technique. The fabrication procedure provides particles with a narrow size distribution and nearly uniform morphology. The content of hemoglobin (Hb) in the particles corresponded to 80% of the Hb content in native erythrocytes. Furthermore, we demonstrate a successful perfusion of isolated mouse glomeruli with concentrated HbP suspensions in vitro. A normal, nonvasoconstrictive behavior of the afferent arterioles is observed, suggesting no oxygen oversupply and limited NO scavenging by these particles, making them a highly promising blood substitute.
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Affiliation(s)
- Yu Xiong
- Institute of Transfusion Medicine and Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitätsmedizin Berlin , Charitéplatz 1, 10117 Berlin, Germany
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45
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Voigt A, Becher MP, Rahnefeld A, Klingel K, Knobeloch KP. ISGylation exerts a protective function in virus-induced dilated cardiomyopathy. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.3409] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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46
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Keipert S, Ost M, Chadt A, Voigt A, Ayala V, Portero-Otin M, Pamplona R, Al-Hasani H, Klaus S. Skeletal muscle uncoupling-induced longevity in mice is linked to increased substrate metabolism and induction of the endogenous antioxidant defense system. Am J Physiol Endocrinol Metab 2013; 304:E495-506. [PMID: 23277187 DOI: 10.1152/ajpendo.00518.2012] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Ectopic expression of uncoupling protein 1 (UCP1) in skeletal muscle (SM) mitochondria increases lifespan considerably in high-fat diet-fed UCP1 Tg mice compared with wild types (WT). To clarify the underlying mechanisms, we investigated substrate metabolism as well as oxidative stress damage and antioxidant defense in SM of low-fat- and high-fat-fed mice. Tg mice showed an increased protein expression of phosphorylated AMP-activated protein kinase, markers of lipid turnover (p-ACC, FAT/CD36), and an increased SM ex vivo fatty acid oxidation. Surprisingly, UCP1 Tg mice showed elevated lipid peroxidative protein modifications with no changes in glycoxidation or direct protein oxidation. This was paralleled by an induction of catalase and superoxide dismutase activity, an increased redox signaling (MAPK signaling pathway), and increased expression of stress-protective heat shock protein 25. We conclude that increased skeletal muscle mitochondrial uncoupling in vivo does not reduce the oxidative stress status in the muscle cell. Moreover, it increases lipid metabolism and reactive lipid-derived carbonyls. This stress induction in turn increases the endogenous antioxidant defense system and redox signaling. Altogether, our data argue for an adaptive role of reactive species as essential signaling molecules for health and longevity.
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Affiliation(s)
- S Keipert
- German Institute of Human Nutrition, Potsdam-Rehbruecke, Germany
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47
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Greiner R, Allerdissen M, Voigt A, Richter A. Fluidic microchemomechanical integrated circuits processing chemical information. Lab Chip 2012; 12:5034-5044. [PMID: 23038405 DOI: 10.1039/c2lc40617a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Lab-on-a-chip (LOC) technology has blossomed into a major new technology fundamentally influencing the sciences of life and nature. From a systemic point of view however, microfluidics is still in its infancy. Here, we present the concept of a microfluidic central processing unit (CPU) which shows remarkable similarities to early electronic Von Neumann microprocessors. It combines both control and execution units and, moreover, the complete power supply on a single chip and introduces the decision-making ability regarding chemical information into fluidic integrated circuits (ICs). As a consequence of this system concept, the ICs process chemical information completely in a self-controlled manner and energetically self-sustaining. The ICs are fabricated by layer-by-layer deposition of several overlapping layers based on different intrinsically active polymers. As examples we present two microchips carrying out long-term monitoring of critical parameters by around-the-clock sampling.
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Affiliation(s)
- Rinaldo Greiner
- Institute of Semiconductors and Microsystems, Chair of Polymeric Microsystems (Heisenberg Chair), Technische Universität Dresden and Center for Advancing Electronics Dresden, D-01062 Dresden, Germany
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48
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Ost M, Voigt A, Keipert S, Dokas J, Klaus S. Metabolic effects of mitochondrial uncoupling in murine skeletal muscle: Essential role of AMP-activated protein kinase in metabolic improvements of UCP1-transgenic mice? Exp Clin Endocrinol Diabetes 2012. [DOI: 10.1055/s-0032-1330816] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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49
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Aland S, Landsberg C, Müller R, Stenger F, Bobeth M, Langheinrich AC, Voigt A. Adaptive diffuse domain approach for calculating mechanically induced deformation of trabecular bone. Comput Methods Biomech Biomed Engin 2012; 17:31-8. [PMID: 22417005 DOI: 10.1080/10255842.2012.654606] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Remodelling of trabecular bone is essentially affected by the mechanical load of the trabeculae. Mathematical modelling and simulation of the remodelling process have to include time-consuming calculations of the displacement field within the complex trabecular structure under loading. We present an adaptive diffuse domain approach for calculating the elastic bone deformation based on micro computer tomogram data of real trabecular bone structures and compared it with a conventional voxel-based finite element method. In addition to allowing for higher computational efficiency, the adaptive approach is characterised by a very smooth representation of the bone surface, which suggests that this approach would be suitable as a basis for future simulations of bone resorption and formation processes within the trabecular structure.
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Affiliation(s)
- S Aland
- a Institut für Wissenschaftliches Rechnen , TU Dresden, 01062, Dresden , Germany
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50
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Cadarso VJ, Perera-Núñez J, Jacot-Descombes L, Pfeiffer K, Ostrzinski U, Voigt A, Llobera A, Grützer G, Brugger J. Microlenses with defined contour shapes. Opt Express 2011; 19:18665-18670. [PMID: 21935235 DOI: 10.1364/oe.19.018665] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Ink-jet printing of optical ink over SU-8 pillars is here proposed as a technology for obtaining microlenses with shape control. To demonstrate the flexibility of this method, microlenses with five different contour shapes (ranging from circular and elliptical to toric or more advanced geometries) have been fabricated. Furthermore, the optical properties of the different fabricated lenses have been experimentally investigated. Focal distance, numerical aperture (NA) and full-width at half maximum (FWHM) of the microlenses have been determined. Arrays of microlenses showed an identical behavior with a standard deviation in the total intensity of only 7%. Additionally, the focal plane of the fabricated symmetric microlenses and the Sturm interval of the non-symmetric ones have been obtained. The experimental results demonstrate the validity and flexibility of the proposed technology.
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Affiliation(s)
- V J Cadarso
- Microsystems laboratory (LMIS1), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
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