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Latorre G, Vargas JI, Shah SC, Ivanovic-Zuvic D, Achurra P, Fritzsche M, Leung JS, Ramos B, Jensen E, Uribe J, Montero I, Gandara V, Robles C, Bustamante M, Silva F, Dukes E, Corsi O, Martínez F, Binder V, Candia R, González R, Espino A, Agüero C, Sharp A, Torres J, Roa JC, Pizarro M, Corvalan AH, Rabkin CS, Camargo MC, Riquelme A. Implementation of the updated Sydney system biopsy protocol improves the diagnostic yield of gastric preneoplastic conditions: Results from a real-world study. Gastroenterol Hepatol 2023:S0210-5705(23)00391-6. [PMID: 37598725 PMCID: PMC10875143 DOI: 10.1016/j.gastrohep.2023.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 06/30/2023] [Accepted: 08/14/2023] [Indexed: 08/22/2023]
Abstract
BACKGROUND The updated Sydney system biopsy protocol (USSBP) standardizes the sampling of gastric biopsies for the detection of preneoplastic conditions (e.g., gastric intestinal metaplasia [GIM]), but the real-world diagnostic yield is not well-described. AIM To determine whether regular application of USSBP is associated with higher detection of chronic atrophic gastritis (CAG), GIM and autoimmune gastritis (AIG). METHODS We performed a real-world retrospective study at an academic urban tertiary hospital in Chile. We manually reviewed medical records from consecutive patients undergoing esophagogastroduodenoscopy (EGD) from January to December 2017. Seven endoscopists who performed EGDs were categorized into two groups (USSBP 'regular' and USSBP 'infrequent') based on USSBP adherence, using minimum 20% adherence as the prespecified threshold. Multivariable logistic regression models were used to estimate the odds ratios (aOR) and 95% confidence intervals (CI) for the association between endoscopist groups and the likelihood of diagnosing CAG, GIM or AIG. RESULTS 1206 patients were included in the study (mean age: 58.5; 65.3% female). The USSBP regular group demonstrated a higher likelihood of detecting CAG (20% vs. 5.3%; aOR 4.03, 95%CI: 2.69-6.03), GIM (12.2% vs. 3.4%; aOR 3.91, 95%CI: 2.39-6.42) and AIG (2.9% vs. 0.8%; aOR 6.52, 95%CI: 1.87-22.74) compared to infrequent group. Detection of advanced-stage CAG (Operative Link for Gastritis Assessment stage III/IV) was significantly higher in the USSBP regular vs. infrequent group (aOR 5.84, 95%CI: 2.23-15.31). CONCLUSIONS Routine adherence to USSBP increases the detection rates of preneoplastic conditions, including CAG, GIM and AIG. Standardized implementation of USSBP should be considered in high gastric cancer risk populations.
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Affiliation(s)
- Gonzalo Latorre
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - José Ignacio Vargas
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Shailja C Shah
- Gastroenterology Section, Veterans Affairs, San Diego Healthcare System, San Diego, CA, USA; Division of Gastroenterology, University of California, San Diego, San Diego, CA, USA
| | - Danisa Ivanovic-Zuvic
- Department of Internal Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Pablo Achurra
- Department of Digestive Surgery, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Martín Fritzsche
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Jai-Sen Leung
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Bernardita Ramos
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Elisa Jensen
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Javier Uribe
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Isabella Montero
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Vicente Gandara
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Camila Robles
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Miguel Bustamante
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Felipe Silva
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Eitan Dukes
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Oscar Corsi
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Francisca Martínez
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Victoria Binder
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Roberto Candia
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Robinson González
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alberto Espino
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Carlos Agüero
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Allan Sharp
- Department of Digestive Surgery, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Javiera Torres
- Department of Pathology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Juan Carlos Roa
- Department of Pathology, Pontificia Universidad Católica de Chile, Santiago, Chile; Center for Cancer Prevention and Control, CECAN, Chile
| | - Margarita Pizarro
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alejandro H Corvalan
- Department of Hematology and Oncology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile; Advanced Center for Chronic Diseases (ACCDIS), Santiago, Chile
| | - Charles S Rabkin
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA
| | - M Constanza Camargo
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA
| | - Arnoldo Riquelme
- Department of Gastroenterology, Pontificia Universidad Católica de Chile, Santiago, Chile; Center for Cancer Prevention and Control, CECAN, Chile.
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Pacheco B, Fritzsche M, Bedregal P. Medicina integrativa en la enseñanza de la Psiquiatría: actitudes y conocimientos respecto a la medicina complementaria y alternativa en docentes de programas de la especialidad. Rev Med Chil 2022; 150:107-114. [DOI: 10.4067/s0034-98872022000100107] [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] [Received: 03/19/2021] [Accepted: 12/06/2021] [Indexed: 11/17/2022]
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Clausen MP, Colin-York H, Schneider F, Eggeling C, Fritzsche M. Dissecting the actin cortex density and membrane-cortex distance in living cells by super-resolution microscopy. J Phys D Appl Phys 2017; 50:064002. [PMID: 28458398 PMCID: PMC5390943 DOI: 10.1088/1361-6463/aa52a1] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 11/30/2016] [Accepted: 12/08/2016] [Indexed: 05/30/2023]
Abstract
Nanoscale spacing between the plasma membrane and the underlying cortical actin cytoskeleton profoundly modulates cellular morphology, mechanics, and function. Measuring this distance has been a key challenge in cell biology. Current methods for dissecting the nanoscale spacing either limit themselves to complex survey design using fixed samples or rely on diffraction-limited fluorescence imaging whose spatial resolution is insufficient to quantify distances on the nanoscale. Using dual-color super-resolution STED (stimulated-emission-depletion) microscopy, we here overcome this challenge and accurately measure the density distribution of the cortical actin cytoskeleton and the distance between the actin cortex and the membrane in live Jurkat T-cells. We found an asymmetric cortical actin density distribution with a mean width of 230 (+105/-125) nm. The spatial distances measured between the maximum density peaks of the cortex and the membrane were bi-modally distributed with mean values of 50 ± 15 nm and 120 ± 40 nm, respectively. Taken together with the finite width of the cortex, our results suggest that in some regions the cortical actin is closer than 10 nm to the membrane and a maximum of 20 nm in others.
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Affiliation(s)
- M P Clausen
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, OX3 9DS Oxford, UK
- Department of Physics, Chemistry, and Pharmacy, MEMPHYS-Center for Biomembrane Physics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
| | - H Colin-York
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, OX3 9DS Oxford, UK
| | - F Schneider
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, OX3 9DS Oxford, UK
| | - C Eggeling
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, OX3 9DS Oxford, UK
| | - M Fritzsche
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, OX3 9DS Oxford, UK
- Kennedy Institute for Rheumatology, Roosevelt Drive, University of Oxford, Oxford OX3 7LF Oxford, UK
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Ratassepp M, Klauson A, Chati F, Léon F, Décultot D, Maze G, Fritzsche M. Application of orthogonality-relation for the separation of Lamb modes at a plate edge: numerical and experimental predictions. Ultrasonics 2015; 57:90-95. [PMID: 25465106 DOI: 10.1016/j.ultras.2014.10.022] [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] [Received: 03/28/2014] [Revised: 08/16/2014] [Accepted: 10/25/2014] [Indexed: 06/04/2023]
Abstract
In this study the orthogonality relation-based method for post-processing finite element (FE) predictions and experimental measurements is applied in order to separate Lamb modes at a plate edge at normal incidence. The scattered wave field from the free edge is assumed to be a superposition of all the eigenmodes of an infinite plate. The eigenmode amplitudes of the reflected wave field are determined by implementing the orthogonality-based method on the measured plate edge displacements. Overlapping wavepackets of Lamb modes at a plate edge are simulated by using the FE model and the experiment in the case of an incident S0 mode in a plate with a notch. In the experiment a 3D Scanning Laser Doppler Vibrometer (3D SLDV) (Johansmann and Sauer, 2005) is used to measure 3 dimensional vibrations and thus the edge two-dimensional displacement components simultaneously. It is demonstrated that it is possible to extract signals of various propagating and non-propagating modes in time-domain. The influences of the errors in practical measurements on the extraction procedure have also been studied.
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Affiliation(s)
- M Ratassepp
- Department of Mechanics, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia.
| | - A Klauson
- Department of Mechanics, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia
| | - F Chati
- Laboratoire Ondes et Milieux Complexes UMR CNRS 6294, Université Le Havre, 75 rue Bellot CS 50540, Le Havre, France
| | - F Léon
- Laboratoire Ondes et Milieux Complexes UMR CNRS 6294, Université Le Havre, 75 rue Bellot CS 50540, Le Havre, France
| | - D Décultot
- Laboratoire Ondes et Milieux Complexes UMR CNRS 6294, Université Le Havre, 75 rue Bellot CS 50540, Le Havre, France
| | - G Maze
- Laboratoire Ondes et Milieux Complexes UMR CNRS 6294, Université Le Havre, 75 rue Bellot CS 50540, Le Havre, France
| | - M Fritzsche
- Polytec GmbH, Sales International, Waldbronn, Germany
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5
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Romig C, Beck T, Beller J, Birkhan J, Endres A, Fritzsche M, Gayer U, Glorius J, Isaak J, Mertes L, Pai H, Pietralla N, Ries P, Savran D, Scheck M, Schnorrenberger L, Sonnabend K, Werner V, Zweidinger M. Direct Determination of Ground-State Transition Widths and Natural Level Widths with the Method of Relative Self Absorption. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159301035] [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: 11/14/2022] Open
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6
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Ball DK, Lenz K, Fritzsche M, Varvaro G, Günther S, Krone P, Makarov D, Mücklich A, Facsko S, Fassbender J, Albrecht M. Magnetic properties of granular CoCrPt:SiO 2 thin films deposited on GaSb nanocones. Nanotechnology 2014; 25:085703. [PMID: 24492459 DOI: 10.1088/0957-4484/25/8/085703] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report on the effect of microstructure and geometrically induced modifications of the magnetic properties of granular CoCrPt:SiO2 films with weakly interacting magnetic grains deposited on pre-structured GaSb nanocone templates fabricated by an ion erosion technique. By tuning the irradiation conditions, nanocone patterns of different cone sizes were prepared (from 28 to 120 nm in diameter and 32 to 330 nm high, respectively). The influence of the intergranular exchange coupling was also investigated by varying the SiO2 content from 8 to 12 at.%. Deposition of CoCrPt:SiO2 on samples with small nanocones leads to a close magnetic grain packing, which results in the formation of extended magnetic domains larger than the average distance between the GaSb cones. In contrast, on larger nanocones, the magnetic coating grows on the side-walls, with a large separation between neighboring cones, leading to magnetic single-domain regions, which are correlated to the underlying structure. Magnetometry indicates that both remanence and coercivity decrease with increasing cone size and/or SiO2 content due to a combined effect of the angular distribution of the magnetic easy axis of the grains and the intergranular exchange coupling strength.
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Affiliation(s)
- D K Ball
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf e.V., Bautzner Landstraße 400, D-01328 Dresden, Germany. Technische Universität Dresden, D-01062 Dresden, Germany
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7
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Kittel K, Fritzsche M, Josch L, Vajna S, Ziegmann G. Optimierung des Lagenaufbaus und der Prozessparameter von GFK-Bauteilen am Beispiel eines Behälterstutzens. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050242] [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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8
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Elkmann N, Schulenburg E, Fritzsche M. Mobile Robot System "LiSA" for Safe Human-Robot Interaction. Robotics 2010. [DOI: 10.2316/p.2010.703-039] [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: 11/16/2022] Open
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9
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Abstract
Forisomes are chemomechanically active P-protein aggregates found in the phloem of legumes. They can convert chemical energy into mechanical work when induced by divalent metal ions or changes in pH, which control the folding state of individual forisome proteins. We investigated the changing geometric parameters of individual forisomes and the strength and dynamics of the forces generated during this process. Three different divalent ions were tested (Ca2+, Sr2+ and Ba2+) and were shown to induce similar changes to the normalized length and diameter. In the concentration range from 0.1 to 4 M, K+ and Cl(-) ions had no influence on the contraction behaviour of the forisomes induced by 10 mM Ca2+. In the absence of dissolved oxygen, these changes were independent of the radius of the metal ion, water uptake and the strength of binding between the selected metal ions and those protein molecules responsible for forisome conformational transformation. In the absence of any load, bound Ca2+, Sr2+ and Ba2+ ions showed apparent and averaged dissociation constants of 14, 62 and 1070 microM, respectively. Various forisomes generated bending on a quartz glass fibre with a diameter of 9 microm. The fibre bending was measured microscopically also by correlation between the digital patterns of a predefined window of observation before and after bending. Similar bending forces of approximately 90 nN were measured for a single forisome sequentially exposed to 10 mM Ca2+, Sr2+ and Ba2+. In the absence of dissolved oxygen, the same conditions resulted in averaged bending forces of (93+/-40) nN, (58+/-20) nN, and (91+/-20) nN after contacting different forisomes with 10 mM Ca2+, 10 mM Sr2+, and 10 mM Ba2+ respectively, demonstrating that the force generated was independent on ion concentrations above a certain threshold value.
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Affiliation(s)
- S Schwan
- Fraunhofer Institute of Mechanics of the Materials, Heideallee 19, D-06120 Halle, Germany.
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10
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Savran D, Fritzsche M, Hasper J, Lindenberg K, Müller S, Ponomarev VY, Sonnabend K, Zilges A. Fine structure of the pygmy dipole resonance in (136)Xe. Phys Rev Lett 2008; 100:232501. [PMID: 18643490 DOI: 10.1103/physrevlett.100.232501] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Indexed: 05/26/2023]
Abstract
The photoresponse of the semimagic N=82 nucleus (136)Xe was measured up to the neutron separation energy S(n) using the (gamma, gamma') reaction. A concentration of strong dipole excitations is observed well below S(n) showing a fragmented resonancelike structure. Microscopic calculations in the quasiparticle phonon model including complex configurations of up to three phonons agree well with the experimental data in the total integrated strength, in the shape and the fragmentation of the resonance, which allows us to draw conclusions on the damping mechanism of the pygmy dipole resonance.
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Affiliation(s)
- D Savran
- Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany.
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11
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Becker K, Fritzsche M, Höger S, Lupton JM. Phenylene−Ethynylene Macrocycles as Model Systems of Interchromophoric Interactions in π-Conjugated Macromolecules. J Phys Chem B 2008; 112:4849-53. [DOI: 10.1021/jp800160h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- K. Becker
- Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität München, Amalienstr. 54, 80799 Munich, Germany
| | - M. Fritzsche
- Kekulé-Institut für Organische Chemie und Biochemie der Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany
| | - S. Höger
- Kekulé-Institut für Organische Chemie und Biochemie der Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany
| | - J. M. Lupton
- Department of Physics, University of Utah, Salt Lake City, Utah 84112
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12
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Punkt K, Schering S, Fritzsche M, Asmussen G, Minin EA, Samoilova VE, Müller FU, Schmitz W, Hasselblatt M, Paulus W, Müller-Werdan U, Slezak J, Koehler G, Boecker W, Buchwalow IB. Fibre-related nitric oxide synthase (NOS) in Duchenne muscular dystrophy. Acta Histochem 2007; 109:228-36. [PMID: 17313973 DOI: 10.1016/j.acthis.2007.01.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2006] [Revised: 12/21/2006] [Accepted: 01/05/2007] [Indexed: 11/18/2022]
Abstract
Nitric oxide (NO) mediates fundamental physiological actions on skeletal muscle. The loss of NO synthase (NOS) from the sarcolemma was assumed to be associated with development of Duchenne muscular dystrophy (DMD). We have, however, recently reported that, in contrast to the commonly accepted view, NOS expression in DMD myofibres is up-regulated. This poses the question of the fibre type-specific NOS expression in DMD muscles and how the NOS expression is related to the regeneration or degeneration status. To address this issue, we examined localization of NOS isoforms I, II and III in skeletal muscles of DMD patients employing immunohistochemical labelling with tyramide signal amplification complemented with enzyme histochemistry. We found that NOS immunolabelling as well as metabolic enzyme activity in DMD muscles were heterogeneously distributed along the fibre length of DMD muscle fibres revealing regenerating and degenerate (hypercontracted) fibres as well as normal segments. Like in normal muscles, positive NOS immunoreactivity was found to be associated with fast-oxidative glycolytic (FOG) phenotype. The regeneration status of NOS-positive segments was deduced from the presence of neonatal and developmental myosin heavy chains. High NOS expression in regenerating DMD muscle fibres can be well reconciled with reports about the protective role of endogenous NO in inflammatory diseases and in muscle repair.
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Affiliation(s)
- K Punkt
- Institute of Anatomy, University of Leipzig, Liebigstrasse 13, 04103 Leipzig, Germany.
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Schwan S, Fritzsche M, Cismak A, Heilmann A, Spohn U. In vitro investigation of the geometric contraction behavior of chemo-mechanical P-protein aggregates (forisomes). Biophys Chem 2006; 125:444-52. [PMID: 17125904 DOI: 10.1016/j.bpc.2006.10.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2006] [Revised: 10/13/2006] [Accepted: 10/16/2006] [Indexed: 10/24/2022]
Abstract
We investigated the contracting behavior of forisomes from Vicia faba by carrying out precise measurements of their changing geometric parameters in vitro in the absence and in the presence of dissolved oxygen. Furthermore, we investigated the fine structure of forisomes by scanning electron microscopy. For the first time, single forisomes were titrated with Ca(2+), protons, and hydroxide ions recording the complete progression of their contractions. An apparent Ca(2+)-binding constant of (22+/-3) muM was calculated from two complete titration curves. The forisomes also contracted in the presence of Ba(2+) and Sr(2+) ions, but the amplitudes of contraction were smaller under the same measuring conditions. The time taken to change from the longitudinally expanded into the longitudinally contracted state was up to 2 s shorter in 10 mM Ca(2+) in comparison to 0.2mM Ca(2+). However, the contraction time was prolonged by decreasing the Ca(2+) concentration. In the absence of dissolved oxygen, the transition between the two final states of the forisomes was almost reversible and the amplitude of contraction remained almost constant during the first 25 contraction cycles. In the presence of dissolved oxygen the forisomes denaturated after a few cycles and lost their ability to contract, just after only a few cycles with 10 min in the contracted state. Denaturation of the forisomes occurred appreciably in the contracted state. We propose a cycle process to explain the thermodynamic basis of the Ca(2+)-induced contraction and its reversal by EDTA. Reducing the pH-value from 7.3 to 4.0 caused the forisomes to shorten by approximately 15%, while increasing the pH to 11.0 caused them to shorten by 28 to 30%. In both cases, the increases of the forisomes volume were greater than during the Ca(2+) induced contraction. The pH values of 4.7+/-0.3, and 10.2+/-0.2 marked the inflection points of the acid base titration of different forisomes.
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Affiliation(s)
- S Schwan
- Fraunhofer Institute of Mechanics of the Materials, Heideallee 19, D-06120 Halle, Germany
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Fritzsche M, Ammann RA, Droz S, Bianchetti MG, Aebi C. Changes in antimicrobial resistance of Escherichia coli causing urinary tract infections in hospitalized children. Eur J Clin Microbiol Infect Dis 2005; 24:233-5. [PMID: 15772820 DOI: 10.1007/s10096-005-1301-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- M Fritzsche
- Department of Pediatrics and Institute for Infectious Diseases, University of Bern, 3010, Bern, Switzerland
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Abstract
Ontogenetic brain-asymmetry and its reversal in schizophrenia constitute special cases of a more fundamental principle of sensory-motor integration. Transmitted through an immature optical system, asymmetric inputs from the left visual field induce the infant's right hemispheric preference for lower spatial frequencies during early mother-child interaction. The emerging classical features of hemispheric specialisation later in life can be accounted for by a transformation law of the neuronal reference frames based on relativistic non-linear information processing. Accordingly, the asymmetric distributions of the cannabinoid receptor CB1 in the right basal ganglia and the left area of Wernicke reflect the preferences for lateralised posture, positioning, and speech. Epigenetic development of brain asymmetry thus unifies the different aspects related to cradling and breast-feeding, speech- and visuospatial processing, the dimensional conversion of spatiotemporal information and, in the case of a dysbalanced cannabinoid system, its psychotic reversal. The predicted right hemispheric shift and the inverse relationship between Kolmogorov entropy and its dimensional embedding (Shannon entropy) has ultimately been confirmed by non-linear EEG analysis of a fluoro-methyl-anadamide induced model psychosis splitting conscious from unconscious mental processes.
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Affiliation(s)
- M Fritzsche
- Praxis für Innere Medizin, Adliswil, Switzerland.
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Abstract
Schizophrenia, intoxication with tetrahydrocannabinol (Delta-THC), and cannabis psychosis induce characteristic time and space distortions suggesting a common psychotic dysfunction. Since genetic research into schizophrenia has led into disappointing dead ends, the present study is focusing on this phenotype. It is shown that information theory can account for the dynamical basis of higher sensorimotor information processing and consciousness under physiologic as well as pathologic conditions. If Kolmogorov entropy (inherent in the processing of action and time) breaks down in acute psychosis, it is predicted that Shannon entropy (inherent in the processing of higher dimensional perception) will increase, provoking positive symptoms and altered states of consciousness. In the search for candidate genes and the protection of vulnerable individuals from cannabis abuse, non-linear EEG analysis of Kolmogorov information could thus present us with a novel diagnostic tool to directly assess the breakdown of information processing in schizophrenia.
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Affiliation(s)
- M Fritzsche
- Praxis für Innere Medizin, Soodstrasse 13, Adliswil, 8134, Switzerland.
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Abstract
Schizophrenia is a devastating psychiatric disorder with a high prevalence worldwide. There is therefore a need for animal models allowing the development of new therapeutic interventions and reliable diagnostic tests. In the temporal domain, cannabinoid receptor gene (CB1) knockout mice exhibit behavioural alterations, which parallel symptoms in schizophrenia, cannabis intoxication and dopamine D2 activation. While a specific nucleotide homology between CB1 and D2 accounts for the pathophysiology, pre-inserted spirochaetal DNA on the polyadenylation signal of CB1 reveals the aetiology of schizophrenia. If, in analogy to thalassaemia, mutations occur within this 3' regulatory domain, the genetic expression of CB1 is disrupted and sequential information lost in time. CB1, previously unrecognized as a candidate gene, thus unifies the different aspects of schizophrenic psychosis: cannabis-induced model psychosis, disrupted information processing, spatio-temporal distortions and other psychotic symptoms, disturbed neuronal migration, schizophrenic brain disorder, familial transmission, and prenatal infection by Borrelia burgdorferi.
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Affiliation(s)
- M Fritzsche
- Praxis für Innere Medizin, Adliswil, Switzerland.
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Heller R, Fritzsche M, Hill H, Kick H. [Sleep deprivation as a predictor of response to light therapy in major depression]. Fortschr Neurol Psychiatr 2001; 69:156-63. [PMID: 11386120 DOI: 10.1055/s-2001-12678] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Light therapy (LT) is regarded as the treatment of choice for seasonal affective disorder (SAD). In nonseasonal depression the results of light therapy are nonconclusive. Sleep deprivation (SD), however, is effective in 50-60% of the patients with major depression. The predictive value of Total Sleep Deprivation (TSD) for the treatment outcome of antidepressiva has been already examined. Purpose of the present study was to test whether light therapy is more beneficial in TSD responders than in TSD nonresponders. 40 inpatients with major depressive disorder completed one night of TSD. Twenty TSD responders and 20 TSD nonresponders were randomly assigned to 14 days of bright light therapy (2500 lux, 7-9 a.m.) or 14 days of dim light therapy (red light 50 lux, 7-9 a.m.). Manova with repeated measurements revealed a significant difference in the course of depression over the time between TSD responders and nonresponders, but no significant difference between bright and dim light. Questions of placebo effect, of SAD and of personality variables as predictors of response to SD and LT are being discussed.
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Affiliation(s)
- R Heller
- Psychiatrische Klinik, Universität Heidelberg
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Abstract
BACKGROUND While the majority of depressed patients benefit from total sleep deprivation (TSD), light therapy is regarded as a first-line treatment only for seasonal affective disorder (SAD). The results of light therapy in nonseasonal major depressive disorder have been non-conclusive. We examined the correlation of TSD response and light therapy response in major depressed patients. METHODS 40 inpatients with major depressive disorder (seven with seasonal pattern, 33 without seasonal pattern) were deprived of a night's sleep. The TSD responders, as well as the TSD nonresponders, were randomly assigned to receive adjunct light therapy either with bright white light (2500 lux) or dim red light (50 lux) during 2 weeks beginning on the third day after TSD. RESULTS The 20 TSD responders improved significantly better under the light therapy than the 20 TSD nonresponders (according to the Hamilton Depression Rating Scale and the self-rating depression scale Bf-S; v. Zerssen). LIMITATIONS No significant difference could be found between the two light intensities. Since the patients were additionally treated with medication an interaction with the two adjunctive therapies cannot be excluded. CONCLUSION Our results indicate that a positive TSD response in major depressed patients can be predicative of beneficial outcome of subsequent light therapy.
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Affiliation(s)
- M Fritzsche
- Voss-Str. 2, Department of Psychiatry, University of Heidelberg, D-69115 Heidelberg, Germany
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Sattler HD, Richter P, Fritzsche M, von Turner A, Barnett W. Neurophysiologic tests during antidepressive treatment - an exploratory study. Pharmacopsychiatry 2000; 33:229-33. [PMID: 11147931 DOI: 10.1055/s-2000-8354] [Citation(s) in RCA: 8] [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: 10/17/2022]
Abstract
This is a non-randomized exploratory study showing the sensitivity of neurophysiological parameters for autonomic side-effects during the application of antidepressant drugs. Inpatients on tricyclic antidepressants (TCA: amitriptyline or doxepine), inpatients on serotonine-reuptake inhibitors (SSRI: fluvoxamine or paroxetin) and a control group of healthy volunteers underwent neurophysiological examination. The treatment group was investigated after at least 7 days of continuous treatment with the final dose. Adjustment of the autonomic nervous system was studied, first, by measuring latency and amplitude of the sympathetic skin response (SSR), elicited by electric stimuli and by deep inspiration, and second, by analysis of the heart rate variation (HRV) during rest and inspiration. Relevant affections of the peripheral parts of the reflex arc under discussion were excluded by taking the nerve conduction velocity (NCV) and F-wave referring to cervical segment C7. In total, 48 individuals were examined. The TCA group showed delayed latencies and smaller amplitudes of the SSR in comparison with the controls. In the SSRI group, these parameters did not differ significantly from those of the controls. Analysis of HRV put further emphasis on the impaired adjustment of the autonomic nervous system in the TCA group. To sum up, our test battery indicated a specific vegetative alteration due to TCA.
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Affiliation(s)
- H D Sattler
- Department of Psychiatry, University of Heidelberg, Germany
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Sattler HD, Richter P, Fritzsche M, von Turner A, Barnett W. Neurophysiologic Tests during Antidepressive Treatment - an Exploratory Study. Pharmacopsychiatry 2000. [DOI: 10.1055/s-2000-7585] [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: 10/17/2022]
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Abstract
After stimulation of T-lymphocytes from healthy volunteers with the mitogen phytohemagglutinin (PHA) 40% of the cells exhibit an oscillatory increase in intracellular calcium concentration ([Ca2+]i). During depression the number of cells responding to PHA is reduced to 20%. These cells show a marked decrease in [Ca2+]i-reaction to stimulation and flattened oscillations. This reduction of mitogen-induced Ca2+ signals in T-cells of depressed patients appears to be a reliable state marker in depressive illness and is reversed upon successful treatment with interpersonal psychotherapy (IPT).
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Affiliation(s)
- J B Aldenhoff
- Department of Psychiatry, Central Institute of Mental Health, Mannheim, Germany
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Abstract
In 1984, over 10,000 refugees left the Indonesian province of Irian Jaya, and thus possibly imported Taenia solium taeniasis/cysticercosis into Papua New Guinea, which was believed to be free of T. solium until 1966. In a serological survey carried out in 1986, 50 refugees originating from areas endemic for T. solium and 171 patients from other areas with symptoms suggesting the possibility of cysticercosis were examined. As a sensitive prescreening technique an ELISA was used with a crude antigen extract obtained from T. solium metacestodes of pig origin. Of 221 persons investigated, 79 (36%) were positive in ELISA. For excluding frequently occurring cross-reactions in ELISA, Western-blotting (or EITB, enzyme-linked immunoelectrotransfer blot) was employed. In this test the demonstration of antibody activity to the 26 or the 8 kilodalton band has been proved to be species-specific for T. solium cysticercosis. One from 79 patients positive in ELISA was simultaneously positive (26 and 8 kDa) in Western blot, corresponding to the first case found in Papua New Guinea with a highly probable T. solium cysticercosis. This patient, originating from an endemic area in Irian Jaya, had immigrated into Papua New Guinea in 1980. The present work emphasizes the need for using highly specific immunodiagnostic techniques in seroepidemiology of larval cestode infections. T. solium taeniasis/cysticercosis remains a risk for Papua New Guinea, and refugees originating from endemic areas should be regarded as potential carriers of T. solium.
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Affiliation(s)
- M Fritzsche
- Institute of Parasitology, University of Zurich, Switzerland
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Hampel KE, Fritzsche M, Stopik D. [Quantitative studies on chromosome mutations in human leukocytes induced by cyclophosphamide after activation by liver slices]. Humangenetik 1969; 7:28-37. [PMID: 5770377 DOI: 10.1007/bf00278690] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
MESH Headings
- Chromatids
- Chromosome Aberrations/drug effects
- Chromosomes, Human, 1-3
- Chromosomes, Human, 13-15
- Chromosomes, Human, 16-18
- Chromosomes, Human, 19-20
- Chromosomes, Human, 21-22 and Y
- Chromosomes, Human, 4-5
- Chromosomes, Human, 6-12 and X
- Culture Techniques
- Cyclophosphamide/pharmacology
- Humans
- Leukocytes
- Liver
- Mutagens/pharmacology
- Sex Chromosomes
- Statistics as Topic
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Hampel KE, Stopik D, Fritzsche M. [Cytogenetic studies two N-substituted Cytoxan derivatives on human leukocytes in vitro. I. Dose-effect-levels]. Humangenetik 1968; 5:321-34. [PMID: 5677017 DOI: 10.1007/bf00291641] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Fritzsche M, Heygendorff V. Bücherbesprechungen. Angew Chem Int Ed Engl 1921. [DOI: 10.1002/ange.19210340508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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B., Fritzsche M, Dinslage E. Literatur. Eur Food Res Technol 1912. [DOI: 10.1007/bf02024365] [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: 11/25/2022]
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Cohn R, Fendler G, Kremann R, Haller A, Hanuš J, Stekl L, Ross R, Race R, Thompson GR, Tankard AR, Polenske E, Reinsch A, Lührig H, Sartori A, Fischer K, Alpers K, Fritzsche M, Laband L, Ludwig W, Haupt H, Dons RK, Sprinkmeyer H, Fürstenberg A, Sudendorf T, Breen AG, Hoton L, Matthes H, Streitberger F, Pailheret F, Grünhut L, Crismer L, Wauters J, Ewers E, Mercier E, Hinks E, Ackermann E, Reichard C, Juckenack A, Pasternack R, Siegfeld M, Olig A, Tillmanns J, Harris FW, Hodgson TR, Jean F, Prescher J. Untersuchung von Butter und Margarine. Anal Bioanal Chem 1910. [DOI: 10.1007/bf01307206] [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: 10/25/2022]
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