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Pietsch A, Schroeder J, Dalichau S, Reer R, Engel D, Wahl-Wachendorf A, Solbach T, Edler C, Riepenhof H. Acute effects of an exercise based multimodal in-patient rehabilitation protocol in male knee osteoarthritis patients and the two years follow-up sustainability. Work 2023; 75:1243-1253. [PMID: 36710693 DOI: 10.3233/wor-205264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Working with lifting and carrying heavy loads and kneeling postures with crawling, squats or heel seat position lead to progressive cartilage wear with premature degenerative changes. OBJECTIVE To investigate the effects of the exercise based multimodal 'knee college' and its sustainability in patients with knee osteoarthritis with data assessments before and after a starter course, before a 1-year and a 2-year follow-up refresher course in a retrospective observational study. METHODS A sample of 401 male patients (ICD10: M17 [arthrosis of knee]/ICF: s75011 [knee joint]) from the construction industries were assessed with Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), EuroQol (EQ-5D), Performance Assessment Capacity Testing (PACT), Isokinetic torque H/Q ratio and Physical Work Capacity Test (PWC). Retrospectively, after two years they were divided into three groups based on their intermediate sporting activity: gym (n = 194, age: 50.8±7.0, BMI: 28.8±4,3), home training (n = 110, age: 50.2±7.0, BMI: 28.4±4,2), no exercising (n = 97, age: 48.2±7.0, BMI: 29.2±4,6). RESULTS Patients did not differ significantly in their demographic and anthropometric data prior to the rehab program. Significant interaction effects indicated group-dependent differing sustainability effects for the 2-year follow-up (all outcomes: p < 0.001, except for H/Q ratio: p = 0.03). Group-wise analyses revealed significant acute improvements (after 3-week in-patient starter rehab program: p < 0.05) for all groups in almost all outcomes (except the 'no sport' group, H/Q ratio p = 0.08). These effects remained significant (p < 0.001) only for the 'gym' group during the 1-year and 2-year follow-up. CONCLUSION Our data indicate that 2-year sustainability of acute rehabilitation starter effects was demonstrated especially for patients with adherence and compliance to long-term gym based exercises.
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Affiliation(s)
- Aki Pietsch
- Department of Sports and Rehabilitation Medicine, BG Trauma Hospital of Hamburg, Hamburg, Germany
- BG Rehabilitation Center City Hamburg, Hamburg, Germany
- Department of Sports and Exercise Medicine, Institute of Human Movement Science, University of Hamburg, Hamburg, Germany
| | - Jan Schroeder
- Department of Sports and Exercise Medicine, Institute of Human Movement Science, University of Hamburg, Hamburg, Germany
| | | | - Rüdiger Reer
- Department of Sports and Exercise Medicine, Institute of Human Movement Science, University of Hamburg, Hamburg, Germany
| | - Daniel Engel
- German Social Accident Insurance Institution for the Building Trade (Headquarter), Berlin, Germany
| | - Anette Wahl-Wachendorf
- German Social Accident Insurance Institution for the Building Trade (Headquarter), Berlin, Germany
- Occupational Health Service of the German Social Accident Insurance Institution for the Building Trade, Berlin, Germany
| | - Thomas Solbach
- German Social Accident Insurance Institution for the Building Trade (Headquarter), Berlin, Germany
- Occupational Health Service of the German Social Accident Insurance Institution for the Building Trade, Berlin, Germany
| | - Christopher Edler
- Department of Sports and Rehabilitation Medicine, BG Trauma Hospital of Hamburg, Hamburg, Germany
- BG Rehabilitation Center City Hamburg, Hamburg, Germany
| | - Helge Riepenhof
- Department of Sports and Rehabilitation Medicine, BG Trauma Hospital of Hamburg, Hamburg, Germany
- BG Rehabilitation Center City Hamburg, Hamburg, Germany
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Schertel S, Corzo C, Leitner L, Karrer J, Engel D, Teichmann Y, Zimmer A, Salar-Behzadi S. Going green: Development of a sustainable lipid-based enteric coating formulation for low-dose aspirin multiparticulate systems. Int J Pharm 2022; 614:121453. [PMID: 35021045 DOI: 10.1016/j.ijpharm.2022.121453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 01/01/2022] [Accepted: 01/04/2022] [Indexed: 11/17/2022]
Abstract
There is a rising awareness of pharmaceutical industry of both patient-centric and sustainable product development. Manufacturing of multiparticulate systems (MPS) with functional coating via solvent-free hot melt coating (HMC) can fulfill both requirements. An innovative lipid-based formulation was developed with the composition of palmitic acid and Grindsted® citrem BC-FS (BC-FS) for enteric coating of acetylsalicylic acid (ASA). The ASA crystals were directly hot melt coated to produce user-friendly low-dose ASA MPS for thromboembolism prophylaxis. Prior to HMC, rational boundaries for the process temperature were defined based on the melting and crystallization behavior of coating blend. Stability of coating in terms of resistance to heat stress and solidstate stability were screened via Fourier-transform infrared spectroscopy and x-ray diffraction. Exposure of coating blend to 100 °C for two hours did not cause any chemical degradation. Crystal growth of palmitic acid and polymorphic transformation in BC-FS were observed after storage under accelerated conditions, however did not significantly affect the ASA release from coating. The developed formulation is a unique solvent-free, lipid-based enteric composition and paves the way for sustainable green pharmaceutical manufacturing.
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Affiliation(s)
- Sonja Schertel
- University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, 8010 Graz, Austria; Hermes Arzneimittel GmbH, Division Hermes Pharma, 82049 Pullach, Germany
| | - Carolina Corzo
- University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, 8010 Graz, Austria; Research Center Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Lukas Leitner
- University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, 8010 Graz, Austria; Research Center Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Julia Karrer
- Research Center Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Daniel Engel
- University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, 8010 Graz, Austria; Research Center Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Yannik Teichmann
- University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, 8010 Graz, Austria; Research Center Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Andreas Zimmer
- University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, 8010 Graz, Austria
| | - Sharareh Salar-Behzadi
- University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, 8010 Graz, Austria; Research Center Pharmaceutical Engineering GmbH, 8010 Graz, Austria.
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Engel D, Beilstein CM, Löffel LM, Wuethrich PY. The impact of fluid optimisation before induction of anaesthesia on hypotension after induction. Anaesthesia 2020; 75:1402. [DOI: 10.1111/anae.15080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. Engel
- Bern University Hospital Bern Switzerland
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Venkatachalam N, Bakavayev S, Engel D, Barak Z, Engel S. Primate differential redoxome (PDR) - A paradigm for understanding neurodegenerative diseases. Redox Biol 2020; 36:101683. [PMID: 32829254 PMCID: PMC7451816 DOI: 10.1016/j.redox.2020.101683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/18/2020] [Accepted: 08/06/2020] [Indexed: 12/12/2022] Open
Abstract
Despite different phenotypic manifestations, mounting evidence points to similarities in the molecular basis of major neurodegenerative diseases (ND). CNS has evolved to be robust against hazard of ROS, a common perturbation aerobic organisms are confronted with. The trade-off of robustness is system's fragility against rare and unexpected perturbations. Identifying the points of CNS fragility is key for understanding etiology of ND. We postulated that the 'primate differential redoxome' (PDR), an assembly of proteins that contain cysteine residues present only in the primate orthologues of mammals, is likely to associate with an added level of regulatory functionalities that enhanced CNS robustness against ROS and facilitated evolution. The PDR contains multiple deterministic and susceptibility factors of major ND, which cluster to form coordinated redox networks regulating various cellular processes. The PDR analysis revealed a potential CNS fragility point, which appears to associates with a non-redundant PINK1-PRKN-SQSTM1(p62) axis coordinating protein homeostasis and mitophagy.
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Affiliation(s)
- Nachiyappan Venkatachalam
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Shamchal Bakavayev
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Daniel Engel
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Zeev Barak
- Department of Life Sciences, Faculty of Natural Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Stanislav Engel
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
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Weder D, von Korff Schmising C, Günther CM, Schneider M, Engel D, Hessing P, Strüber C, Weigand M, Vodungbo B, Jal E, Liu X, Merhe A, Pedersoli E, Capotondi F, Lüning J, Pfau B, Eisebitt S. Transient magnetic gratings on the nanometer scale. Struct Dyn 2020; 7:054501. [PMID: 32923511 PMCID: PMC7481012 DOI: 10.1063/4.0000017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 08/04/2020] [Indexed: 06/11/2023]
Abstract
Laser-driven non-local electron dynamics in ultrathin magnetic samples on a sub-10 nm length scale is a key process in ultrafast magnetism. However, the experimental access has been challenging due to the nanoscopic and femtosecond nature of such transport processes. Here, we present a scattering-based experiment relying on a laser-induced electro- and magneto-optical grating in a Co/Pd ferromagnetic multilayer as a new technique to investigate non-local magnetization dynamics on nanometer length and femtosecond timescales. We induce a spatially modulated excitation pattern using tailored Al near-field masks with varying periodicities on a nanometer length scale and measure the first four diffraction orders in an x-ray scattering experiment with magnetic circular dichroism contrast at the free-electron laser facility FERMI, Trieste. The design of the periodic excitation mask leads to a strongly enhanced and characteristic transient scattering response allowing for sub-wavelength in-plane sensitivity for magnetic structures. In conjunction with scattering simulations, the experiment allows us to infer that a potential ultrafast lateral expansion of the initially excited regions of the magnetic film mediated by hot-electron transport and spin transport remains confined to below three nanometers.
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Affiliation(s)
- D. Weder
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
| | - C. von Korff Schmising
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
| | - C. M. Günther
- Zentraleinrichtung Elektronenmikroskopie (ZELMI), Technische Universität Berlin, 10623 Berlin, Germany
| | - M. Schneider
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
| | - D. Engel
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
| | - P. Hessing
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
| | - C. Strüber
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
| | - M. Weigand
- Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany
| | - B. Vodungbo
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique–Matière et Rayonnement, LCPMR, 75005 Paris, France
| | - E. Jal
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique–Matière et Rayonnement, LCPMR, 75005 Paris, France
| | - X. Liu
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique–Matière et Rayonnement, LCPMR, 75005 Paris, France
| | - A. Merhe
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique–Matière et Rayonnement, LCPMR, 75005 Paris, France
| | - E. Pedersoli
- Elettra-Sincrotrone Trieste, Basovizza, 34149 Trieste, Italy
| | - F. Capotondi
- Elettra-Sincrotrone Trieste, Basovizza, 34149 Trieste, Italy
| | - J. Lüning
- Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany
| | - B. Pfau
- Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
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Jagla M, Tschache A, Wagner S, Engel D, Häring M, Franke GH. Assessing anxiety and depression in people with intellectual disability – a feasibility study. Psychother Psychosom Med Psychol 2018. [DOI: 10.1055/s-0038-1667978] [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: 10/28/2022]
Affiliation(s)
- M Jagla
- Hochschule Magdeburg-Stendal, Rehabilitationspsychologie, Stendal, Deutschland
| | - A Tschache
- Hochschule Magdeburg-Stendal, Rehabilitationspsychologie, Stendal, Deutschland
| | - S Wagner
- Hochschule Magdeburg-Stendal, Rehabilitationspsychologie, Stendal, Deutschland
| | - D Engel
- Hochschule Magdeburg-Stendal, Rehabilitationspsychologie, Stendal, Deutschland
| | - M Häring
- AWO Fachkrankenhaus Jerichow, Jerichow, Deutschland
| | - GH Franke
- Hochschule Magdeburg-Stendal, Rehabilitationspsychologie, Stendal, Deutschland
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Wiesemann A, Ketteler J, Alexis S, Röck K, Engel D, Jendrossek V, Klein D. PO-112 The senescence associated secretory phenotype (SASP)-factor CcL2 fosters vascular dysfunction and endothelial cell loss in radiation-induced lung disease. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.637] [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: 11/03/2022] Open
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Dalichau S, Giemsa M, Solbach T, Büschke M, Engel D, Möller T, Wahl-Wachendorf A. [Knee school as a secondary preventive approach : The sustainable treatment of occupational gonarthrosis]. Orthopade 2018; 47:553-560. [PMID: 29725705 DOI: 10.1007/s00132-018-3574-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND 2-6 months after successful medical rehabilitation in gonarthrosis, the positive effects remit without the implementation of adequate aftercare strategies. OBJECTIVES A prospective comparative study aimed to investigate whether and to what extent the sustainability model of knee school for the secondary preventive treatment of occupational gonarthrosis is able to maintain positive treatment effects in the medium term. MATERIAL AND METHODS A total of 292 male employees from the building trade went through the three-week phase 1 of the biopsychosocial knee college with a focus on ergonomics and muscle strength training. In the following 12 months (Phase 2), the participants were contacted several times by telephone in order to motivate them to continue the training. While 178 employees voluntarily and locally continued their training in selected fitness centers with financial support (VG 1), and 38 employees opted for an individual home program (VG 2), 76 participants stopped all training (KG). RESULTS After Phase 1, all groups showed significant improvements in the parameters mobility, as well as stretch ability and strength endurance of the thigh muscles, complaints of the knee and quality of life. While the parameters in VG 1 continued to develop positively after 12 months, the measured values in VG 2, with the exception of muscle strength, moderately remitted. By contrast, a significant decline in the measurement values partly below the status quo ante was observed for the KG. CONCLUSIONS As part of the aftercare, financially supported training in a fitness center with accompanying regular telephone contacts for male construction workers with knee discomforts shows positive effects if the participation is voluntary. Organized training in the fitness center is superior to individual home programs.
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Affiliation(s)
- S Dalichau
- BG Ambulanz Bremen, Industriestr. 3, 28199, Bremen, Deutschland.
| | - M Giemsa
- BG Klinikum Hamburg Rehazentrum City, Hamburg, Deutschland
| | - T Solbach
- Arbeitsmedizinische und sicherheitstechnische Dienst, Berufsgenossenschaft der Bauwirtschaft - Hauptverwaltung (Berlin), Berlin, Deutschland
| | - M Büschke
- Berufsgenossenschaft der Bauwirtschaft - Hauptverwaltung (Berlin), Berlin, Deutschland
| | - D Engel
- Berufsgenossenschaft der Bauwirtschaft - Hauptverwaltung (Berlin), Berlin, Deutschland
| | - T Möller
- BG Ambulanz Bremen, Industriestr. 3, 28199, Bremen, Deutschland
| | - A Wahl-Wachendorf
- Arbeitsmedizinische und sicherheitstechnische Dienst, Berufsgenossenschaft der Bauwirtschaft - Hauptverwaltung (Berlin), Berlin, Deutschland
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9
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Böttcher JP, Beyer M, Meissner F, Abdullah Z, Sander J, Höchst B, Eickhoff S, Rieckmann JC, Russo C, Bauer T, Flecken T, Giesen D, Engel D, Jung S, Busch DH, Protzer U, Thimme R, Mann M, Kurts C, Schultze JL, Kastenmüller W, Knolle PA. Functional classification of memory CD8(+) T cells by CX3CR1 expression. Nat Commun 2015; 6:8306. [PMID: 26404698 PMCID: PMC4667439 DOI: 10.1038/ncomms9306] [Citation(s) in RCA: 181] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Accepted: 08/06/2015] [Indexed: 01/01/2023] Open
Abstract
Localization of memory CD8(+) T cells to lymphoid or peripheral tissues is believed to correlate with proliferative capacity or effector function. Here we demonstrate that the fractalkine-receptor/CX3CR1 distinguishes memory CD8(+) T cells with cytotoxic effector function from those with proliferative capacity, independent of tissue-homing properties. CX3CR1-based transcriptome and proteome-profiling defines a core signature of memory CD8(+) T cells with effector function. We find CD62L(hi)CX3CR1(+) memory T cells that reside within lymph nodes. This population shows distinct migration patterns and positioning in proximity to pathogen entry sites. Virus-specific CX3CR1(+) memory CD8(+) T cells are scarce during chronic infection in humans and mice but increase when infection is controlled spontaneously or by therapeutic intervention. This CX3CR1-based functional classification will help to resolve the principles of protective CD8(+) T-cell memory.
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Affiliation(s)
- Jan P. Böttcher
- Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany
| | - Marc Beyer
- Genomics and Immunoregulation, LIMES-Institute, Universität Bonn, Carl-Troll-Street 31, Bonn 53115, Germany
| | - Felix Meissner
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, München 82152, Germany
| | - Zeinab Abdullah
- Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany
| | - Jil Sander
- Genomics and Immunoregulation, LIMES-Institute, Universität Bonn, Carl-Troll-Street 31, Bonn 53115, Germany
| | - Bastian Höchst
- Institute of Molecular Immunology and Experimental Oncology, Technische Universität München, Ismaninger Street 22, München 81675, Germany
| | - Sarah Eickhoff
- Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany
| | - Jan C. Rieckmann
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, München 82152, Germany
| | - Caroline Russo
- Institute of Virology, Technische Universität München, Troger Street 30, München 81675, Germany
| | - Tanja Bauer
- Institute of Virology, Technische Universität München, Troger Street 30, München 81675, Germany
| | - Tobias Flecken
- Clinic for Internal Medicine II, Universitätsklinikum Freiburg, Hugstetter Street 55, Freiburg 79106, Germany
| | - Dominik Giesen
- Clinic for Internal Medicine II, Universitätsklinikum Freiburg, Hugstetter Street 55, Freiburg 79106, Germany
| | - Daniel Engel
- Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany
| | - Steffen Jung
- Weizmann Institute of Science, Rehovot 76100, Israel
| | - Dirk H. Busch
- Institute of Microbiology, Immunology and Hygiene, Technische Universität München, Troger Street 30, München 81675, Germany
| | - Ulrike Protzer
- Institute of Virology, Technische Universität München, Troger Street 30, München 81675, Germany
| | - Robert Thimme
- Clinic for Internal Medicine II, Universitätsklinikum Freiburg, Hugstetter Street 55, Freiburg 79106, Germany
| | - Matthias Mann
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, München 82152, Germany
| | - Christian Kurts
- Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany
| | - Joachim L. Schultze
- Genomics and Immunoregulation, LIMES-Institute, Universität Bonn, Carl-Troll-Street 31, Bonn 53115, Germany
| | - Wolfgang Kastenmüller
- Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany
| | - Percy A. Knolle
- Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany
- Institute of Molecular Immunology and Experimental Oncology, Technische Universität München, Ismaninger Street 22, München 81675, Germany
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De Bem A, Engel D, de Oliveira J, Moreira ELG, Neis VB, Santos DB, Lopes JB, Rodrigues ALS, Brocardo P. Hypercholesterolemia as a risk factor for depressive disorder? Free Radic Biol Med 2014; 75 Suppl 1:S28. [PMID: 26461327 DOI: 10.1016/j.freeradbiomed.2014.10.753] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
AIMS Epidemiological findings demonstrated that increased plasma cholesterol levels are frequently observed in depressive patients. In this regard, there is enhancing evidence that hypercholesterolemia is associated with impairment of brain function. Recently, we demonstrated that low-density lipoprotein receptor knockout (LDLr(-/-)) mice- a widely used rodent model of familial hypercholesterolemia - exhibited memory deficits and cortico-cerebral mitochondrial dysfunction. In this study, we aimed to assess the hypercholesterolemic mice in predictive tasks for depressive-like behavior. METHODS Adult wild type C57BL/6 and LDLr (-/-) mice were evaluated in two tests for depressive like behavior, the splash test and forced swimming test. In addition, the activity of monoamine oxidase isoforms and the mRNA levels of hemeoxygenase-1 were assessed in the hippocampus and cerebral cortex of C57BL/6 and LDLr (-/-) mice. Finally, the blood-brain-barrier (BBB) permeability was investigated using the AQP-4 immunofluorescence staining in the mice hippocampus. RESULTS The LDLr (-/-) mice showed a significant reduction in the grooming time in the splash test and increased immobility time in the forced swimming test, and both parameters were reversed by fluoxetine antidepressant treatment (10mg/kg, 7 days, o.g.). Interestingly, the depressive like behavior of LDLr (-/-) mice was associated with increased activity of monoamine oxidase A, decreased hemeoxygenase-1 mRNA levels and increase of BBB permeability in the hippocampus. CONCLUSIONS Overall, these data provide new evidence that hypercholesterolemia could trigger brain alterations involved in depressive disorders.
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Affiliation(s)
- A De Bem
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil..
| | - D Engel
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
| | - J de Oliveira
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
| | - E L G Moreira
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
| | - V B Neis
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
| | - D B Santos
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
| | - J B Lopes
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
| | - A L S Rodrigues
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
| | - P Brocardo
- Campus Universitário Trindade (Centro de Ciências Biológica), Departamento de Bioquímica, Florianópolis - Brazil
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Assis L, Straliotto M, Engel D, Hort M, Dutra R, de Bem A. β-Caryophyllene protects the C6 glioma cells against glutamate-induced excitotoxicity through the Nrf2 pathway. Neuroscience 2014; 279:220-31. [DOI: 10.1016/j.neuroscience.2014.08.043] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 08/25/2014] [Accepted: 08/26/2014] [Indexed: 10/24/2022]
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Derewenda Z, Dziubanska P, Derewenda U, Ellena J, Haley K, Engel D. The crystal structure of the C-terminal domain of the Ebola virus nucleoprotein. Acta Crystallogr A Found Adv 2014. [DOI: 10.1107/s2053273314084058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Ebola virus (EBOV) and Marburg virus are members of the family Filoviridae. Both are highly pathogenic and cause hemorrhagic fever, lethal in 90% of infected people. There is fear that the viruses can be used as bioterrorism agents. There are no approved vaccines, and intense effort is underway to discover drugs targeting these viruses. The EBOV genome encodes seven proteins, two of which have no known structures: RNA polymerase (L) and nucleoprotein (NP). NP is essential for packaging viral genomic RNA into the nucleocapsid. Other viruses also contain nucleoproteins, but only the Ebola and Marburg NP proteins contain two distinct domains. The C-terminal domain (Ct; ~100 residues) has no homologues; it acts as a hub for protein-protein interactions important for the assembly of the nucleocapsid and for the interaction with the VP40 matrix protein, embedded in the viral membrane. We obtained three distinct crystal forms of the Ct domain of NP from EBOV, and solved the structures using anomalous scattering from Se, and Molecular Replacement. High-quality NMR data were also collected. The models were refined at 1.6-2.0 Å resolution to R factors ~20%. The protein has a novel fold, with topology distantly related to the β-grasp fold. In spite of its small size, the Ct domain shows high melting temperature of ~60°C. Our efforts focus on the identification of how the C-terminal domain of NP binds to its partners. As part of an effort towards anti-filovirus drug discovery, proteins NP, VP24, VP35 and VP40 are being targeted for small molecule inhibition using a yeast-based phenotypic assay. Each protein, when expressed in budding yeast, produces a slow-growth phenotype. Chemical suppressors of the slow-growth phenotype will be identified and used in viral growth assays to confirm their antiviral activity. The structure of NP will be used to complement small molecule screening methods.
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Fournier JY, Tasman J, Schmid R, Schindel R, Engel D. Experimental Model for Training of Endoscopic Transsphenoidal Pituitary Adenoma Resection. J Neurol Surg B Skull Base 2014. [DOI: 10.1055/s-0034-1384123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Yetimoglu C, Rafeiner P, Engel D, Fournier JY. Spinal infections due to Eikenella corrodens: case report and literature review. Neurochirurgie 2014; 60:197-200. [PMID: 24874721 DOI: 10.1016/j.neuchi.2014.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 02/26/2014] [Accepted: 03/29/2014] [Indexed: 01/08/2023]
Abstract
Spinal infections with Eikenella corrodens are rare. We report a unique case of infection caused by E. corrodens diagnosed more than two years after cervical surgery. All other published cases of spinal infections caused by E. corrodens were searched. Characteristics of this bacterium, its challenging diagnosis and therapy are discussed.
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Affiliation(s)
- C Yetimoglu
- Service de neurochirurgie, hôpital Cantonal de St. Gall, Rorschacher Strasse 95, 9007 St. Gall, Switzerland.
| | - P Rafeiner
- Clinique de medicine interne, hôpital de Zofingen, 4800 Zofingen, Switzerland
| | - D Engel
- Service de neurochirurgie, hôpital Cantonal de St. Gall, Rorschacher Strasse 95, 9007 St. Gall, Switzerland
| | - J-Y Fournier
- Service de neurochirurgie, hôpital Cantonal de St. Gall, Rorschacher Strasse 95, 9007 St. Gall, Switzerland
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Chatzigeorgiou A, Seijkens T, Zarzycka B, Engel D, Poggi M, Chung KJ, Garcia Martin R, Lutgens E, Triantafyllos T. CD40-TRAF6 pathway as a therapeutic target in obesity-associated metabolic dysfunction. DIABETOL STOFFWECHS 2014. [DOI: 10.1055/s-0034-1374895] [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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Fournier JY, Tasman A, Schmid R, Schindel R, Engel D. Experimental Model for Training of Endoscopic Transsphenoidal Pituitary Adenoma Resection. Skull Base Surg 2014. [DOI: 10.1055/s-0034-1370515] [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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Djudjaj S, Lue H, Urzinicok T, Engel D, Martin IV, Buhl EM, Floege J, Ostendorf T, Bernhagen J, Boor P, Cantaluppi V, Medica D, Mannari C, Figliolini F, Migliori M, Panichi V, Tetta C, Camussi G, Schulte K, Berger K, Sicking EM, Boor P, Jirak P, Thevissen L, Fuss A, Kriz W, Floege J, Smeets B, Moeller MJ, Santhosh Kumar VR, Kulkarni OP, Darisipudi NM, Mulay SR, Anders HJ, Assady S, Alter J, Litvak M, Ilan N, Vlodavsky I, Abassi Z. Glomerular injury. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Koscielny A, Engel D, Maurer J, Wehner S, Kurts C, Kalff JC. The role of lymphoid tissue in the attenuation of the postoperative ileus. Am J Physiol Gastrointest Liver Physiol 2013; 304:G401-12. [PMID: 23238935 DOI: 10.1152/ajpgi.00161.2012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Standardized intestinal manipulation (IM) leads to local bowel wall inflammation subsequently spreading over the entire gastrointestinal tract. Previously, we demonstrated that this so-called gastrointestinal field effect (FE) is immune-mediated. The aim of this study was to investigate the role of secondary lymphoid organs [mesenteric lymph nodes (MLN), gut-associated lymphoid tissue (GALT)] in IM-mediated FE by employing mice with deficient secondary lymphoid organs (aly/aly, MLN ex) or by administration of 2-amino-2-[2-(4-octylphenyl)ethyl]-1,3-propanediol (FTY720), an immunomodulating agent that inhibits emigration of lymphocytes out of lymphoid organs. Small bowel muscularis, and colonic muscularis from wild-type mice as control, from aly/aly mice, FTY720-treated mice (daily dose of 1.0 mg/kg mouse ip starting 3 days before surgical procedure), and wild-type mice that had undergone removal of mesenteric lymph nodes before IM (MLN ex mice) were obtained after selective IM of the jejunum or sham operation. FE was analyzed by measuring transit time of orally administered fluorescent dextran in the gastrointestinal tract [geometric center (GC) of fluorescent dextran], colonic transit time, infiltration of myeloperoxidase-positive cells, and circular smooth muscle contractility. Furthermore, mRNA levels of inflammatory cytokines [interleukin (IL)-6, tumor necrosis factor (TNF)-α, macrophage inflammatory protein (MIP)-1α] were determined by Taqman-PCR. We observed a significantly reduced upregulation of proinflammatory cytokines (IL-6, TNF-α, MIP-1α) in colonic muscularis of MLN ex mice, aly/aly mice, and FTY720-treated mice compared with wild-type mice. Contractility of circular muscularis strips of the colon but not the jejunum was significantly improved in aly/aly mice and FTY720-treated wild-type mice. Additionally, inflammation of the colon determined by the number of myeloperoxidase-positive cells and colonic transit time were significantly improved in aly/aly mice, FTY720-treated wild-type mice, and in MLN ex mice. In summary, lack of secondary lymphoid organs (MLN + GALT) in aly/aly mice or administration of FTY720 abrogated FE after IM as opposed to wild-type mice. These data demonstrate that secondary lymphoid organs are involved in the propagation of FE and postoperative ileus. FTY720 indirectly affects FE by inhibiting migration of activated T cells from the jejunum and adjacent secondary lymphoid organs to the colon. These findings support the crucial role of the adaptive immune system in FE, most likely by a sphyngosine 1-phosphate-dependent mechanism.
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Affiliation(s)
- A Koscielny
- Department of Surgery, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany.
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Westenhoefer J, Engel D, Holst C, Lorenz J, Peacock M, Stubbs J, Whybrow S, Raats M. Cognitive and weight-related correlates of flexible and rigid restrained eating behaviour. Eat Behav 2013; 14:69-72. [PMID: 23265405 DOI: 10.1016/j.eatbeh.2012.10.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 09/03/2012] [Accepted: 10/24/2012] [Indexed: 10/27/2022]
Abstract
OBJECTIVES Examine the association between components of restrained eating, cognitive performance and weight loss maintenance. METHODS 106 women, all members of a commercial slimming organisation for at least 6 months (mean±SD: 15.7±12.4 months), were studied who, having lost 10.1±9.7 kg of their initial weight, were hoping to sustain their weight loss during the 6 month study. Dietary restraint subcomponents flexible and rigid restraint, as well as preoccupying cognitions with food, body-shape and diet were assessed using questionnaires. Attentional bias to food and shape-related stimuli was measured using a modified Stroop test. Working memory performance was assessed using the N-back test. These factors, and participant weight, were measured twice at 6 month intervals. RESULTS Rigid restraint was associated with attentional bias to food and shape-related stimuli (r=0.43, p<0.001 resp. r=0.49, p<0.001) whereas flexible restraint correlated with impaired working memory (r=-0.25, p<0.05). In a multiple regression analyses, flexible restraint was associated with more weight lost and better weight loss maintenance, while rigid restraint was associated with less weight loss. CONCLUSIONS Rigid restraint correlates with a range of preoccupying cognitions and attentional bias to food and shape-related stimuli. Flexible restraint, despite the impaired working memory performance, predicts better long-term weight loss. Explicitly encouraging flexible restraint may be important in preventing and treating obesity.
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Engel D, Greff K, Garth C, Bein K, Wexler A, Hamann B, Hagen H. Visual Steering and Verification of Mass Spectrometry Data Factorization in Air Quality Research. IEEE Trans Vis Comput Graph 2012; 18:2275-2284. [PMID: 26357135 DOI: 10.1109/tvcg.2012.280] [Citation(s) in RCA: 3] [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: 06/05/2023]
Abstract
The study of aerosol composition for air quality research involves the analysis of high-dimensional single particle mass spectrometry data. We describe, apply, and evaluate a novel interactive visual framework for dimensionality reduction of such data. Our framework is based on non-negative matrix factorization with specifically defined regularization terms that aid in resolving mass spectrum ambiguity. Thereby, visualization assumes a key role in providing insight into and allowing to actively control a heretofore elusive data processing step, and thus enabling rapid analysis meaningful to domain scientists. In extending existing black box schemes, we explore design choices for visualizing, interacting with, and steering the factorization process to produce physically meaningful results. A domain-expert evaluation of our system performed by the air quality research experts involved in this effort has shown that our method and prototype admits the finding of unambiguous and physically correct lower-dimensional basis transformations of mass spectrometry data at significantly increased speed and a higher degree of ease.
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Affiliation(s)
- D Engel
- University of Kaiserslautern, Germany. d
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Rosnizeck IC, Spoerner M, Harsch T, Kreitner S, Filchtinski D, Herrmann C, Engel D, König B, Kalbitzer HR. Metal-Bis(2-picolyl)amine Complexes as State 1(T) Inhibitors of Activated Ras Protein. Angew Chem Int Ed Engl 2012; 51:10647-51. [DOI: 10.1002/anie.201204148] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2012] [Indexed: 11/10/2022]
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Rosnizeck IC, Spoerner M, Harsch T, Kreitner S, Filchtinski D, Herrmann C, Engel D, König B, Kalbitzer HR. Metall-Bis(2-picolyl)amin-Komplexe als Zustand-1(T)-Inhibitoren für aktiviertes Ras-Protein. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204148] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Stubbs J, Whybrow S, Teixeira P, Blundell J, Lawton C, Westenhoefer J, Engel D, Shepherd R, McConnon A, Gilbert P, Raats M. Problems in identifying predictors and correlates of weight loss and maintenance: implications for weight control therapies based on behaviour change. Obes Rev 2011; 12:688-708. [PMID: 21535362 DOI: 10.1111/j.1467-789x.2011.00883.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Weight management is a dynamic process, with a pre-treatment phase, a treatment (including process) phase and post-treatment maintenance, and where relapse is possible during both the treatment and maintenance. Variability in the statistical power of the studies concerned, heterogeneity in the definitions, the complexity of obesity and treatment success, the constructs and measures used to predict weight loss and maintenance, and an appreciation of who and how many people achieve it, make prediction difficult. In models of weight loss or maintenance: (i) predictors explain up to 20-30% of the variance; (ii) many predictors are the sum of several small constituent variables, each accounting for a smaller proportion of the variance; (iii) correlational or predictive relationships differ across study populations; (iv) inter-individual variability in predictors and correlates of outcomes is high and (v) most of the variance remains unexplained. Greater standardization of predictive constructs and outcome measures, in more clearly defined study populations, tracked longitudinally, is needed to better predict who sustains weight loss. Treatments need to develop a more individualized approach that is sensitive to patients' needs and individual differences, which requires measuring and predicting patterns of intra-individual behaviour variations associated weight loss and its maintenance. This information will help people shape behaviour change solutions to their own lifestyle needs.
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Abstract
Standardized intestinal manipulation (IM) leads to local bowel wall inflammation subsequently spreading over the entire gastrointestinal tract. Previously, we demonstrated that this so-called gastrointestinal field effect (FE) is immune mediated. This study aimed to investigate the role of CCR7 in IM-induced FE. Since CCR7 is expressed on activated dendritic cells and T cells and is well known to control their migration, we hypothesized that lack of CCR7 reduces or abolishes FE. Small bowel muscularis and colonic muscularis from CCR7(-/-) and wild-type (WT) mice were obtained after IM of the jejunum or sham operation. FE was analyzed by measuring gastrointestinal transit time of orally given fluorescent dextran (geometric center), colonic transit time, infiltration of MPO-positive cells, and circular smooth muscle contractility. Furthermore, mRNA levels of the inflammatory cytokine IL-6 were determined by RT-PCR. The number of dendritic cells and CD3+CD25+ T cells separately isolated from jejunum and colon was determined in mice after IM and sham operation. There was no significant difference in IL-6 mRNA upregulation in colonic muscularis between sham-operated WT and CCR7(-/-) mice after IM. Contractility of circular muscularis strips of the colon was significantly improved in CCR7(-/-) animals following IM and did not vary significantly from sham-operated animals. Additionally, inflammation of the colon determined by the number of MPO-positive cells and colonic transit time was significantly reduced in CCR7(-/-) mice. In contrast, jejunal contractility and jejunal inflammation of transgenic mice did not differ significantly from WT mice after IM. These data are supported by a significant increase of CD3+CD25+ T cells in the colonic muscularis of WT mice after IM, which could not be observed in CCR7(-/-) mice. These data demonstrate that CCR7 is required for FE and postoperative ileus. CCR7 indirectly affects FE by inhibiting migration of activated dendritic cells and of T cells from the jejunum to the colon. These findings support the critical role of the adaptive immune system in FE.
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Affiliation(s)
- A Koscielny
- Department of Surgery, Rheinische Friedrich-Wilhelms-Universität Bonn, Germany.
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Koscielny A, Engel D, Kurts C, Kalff JC. The gastrointestinal field effect: Is it immune-mediated? J Am Coll Surg 2010. [DOI: 10.1016/j.jamcollsurg.2010.06.042] [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: 10/19/2022]
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Engel D, Curio C. Factors influencing the detectability of pedestrians in urban environments. J Vis 2010. [DOI: 10.1167/10.7.1247] [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: 11/24/2022] Open
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Curio C, Engel D. A Computational Mid-level Vision Approach for Shape-Specific Saliency Detection. J Vis 2010. [DOI: 10.1167/10.7.1160] [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: 11/24/2022] Open
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Bosschaerts T, Guilliams M, Stijlemans B, Morias Y, Engel D, Tacke F, Hérin M, De Baetselier P, Beschin A. Tip-DC development during parasitic infection is regulated by IL-10 and requires CCL2/CCR2, IFN-gamma and MyD88 signaling. PLoS Pathog 2010; 6:e1001045. [PMID: 20714353 PMCID: PMC2920868 DOI: 10.1371/journal.ppat.1001045] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Accepted: 07/15/2010] [Indexed: 12/24/2022] Open
Abstract
The development of classically activated monocytic cells (M1) is a prerequisite for effective elimination of parasites, including African trypanosomes. However, persistent activation of M1 that produce pathogenic molecules such as TNF and NO contributes to the development of trypanosome infection-associated tissue injury including liver cell necrosis in experimental mouse models. Aiming to identify mechanisms involved in regulation of M1 activity, we have recently documented that during Trypanosoma brucei infection, CD11b+Ly6C+CD11c+ TNF and iNOS producing DCs (Tip-DCs) represent the major pathogenic M1 liver subpopulation. By using gene expression analyses, KO mice and cytokine neutralizing antibodies, we show here that the conversion of CD11b+Ly6C+ monocytic cells to pathogenic Tip-DCs in the liver of T. brucei infected mice consists of a three-step process including (i) a CCR2-dependent but CCR5- and Mif-independent step crucial for emigration of CD11b+Ly6C+ monocytic cells from the bone marrow but dispensable for their blood to liver migration; (ii) a differentiation step of liver CD11b+Ly6C+ monocytic cells to immature inflammatory DCs (CD11c+ but CD80/CD86/MHC-IIlow) which is IFN-γ and MyD88 signaling independent; and (iii) a maturation step of inflammatory DCs to functional (CD80/CD86/MHC-IIhigh) TNF and NO producing Tip-DCs which is IFN-γ and MyD88 signaling dependent. Moreover, IL-10 could limit CCR2-mediated egression of CD11b+Ly6C+ monocytic cells from the bone marrow by limiting Ccl2 expression by liver monocytic cells, as well as their differentiation and maturation to Tip-DCs in the liver, showing that IL-10 works at multiple levels to dampen Tip-DC mediated pathogenicity during T. brucei infection. A wide spectrum of liver diseases associates with alteration of monocyte recruitment, phenotype or function, which could be modulated by IL-10. Therefore, investigating the contribution of recruited monocytes to African trypanosome induced liver injury could potentially identify new targets to treat hepatic inflammation in general, and during parasite infection in particular. Most infections are associated with host inflammatory responses that can result in multiple organ failure and death. It is therefore essential to understand the mechanisms balancing host immune response and tissue damage. Mouse models of African trypanosome infection represent valuable tools to study the mechanisms contributing to the inflammatory (pathogenic) or anti-inflammatory (anti-pathogenic) immune response. We recently identified TNF and NO producing DCs (Tip-DCs) as major contributors to liver pathogenicity in Trypanosoma brucei infected mice. Herein, the role of different chemokine and cytokines in the generation of Tip-DCs was investigated. Tip-DCs originated from bone marrow derived monocytes that egressed to the blood in a CCR2 chemokine receptor dependent manner. Then, monocytes extravasated to inflamed liver where IFN-γ and MyD88 signaling promoted their maturation to Tip-DCs. Both the egression of monocytes from bone marrow and their IFN-γ/MyD88 dependent maturation to Tip-DCs was counteracted by IL-10, hereby reducing liver pathogenicity. Liver injury, affecting millions of persons worldwide with often lethal consequences, frequently results from uncontrolled activation of recruited monocyte-derived cells that can be modulated by IL-10. Thus, the mechanisms regulating liver immunopathogenicity during parasitic infection identified herein could lead to new therapeutic policies in the field of hepatic inflammation.
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Affiliation(s)
- Tom Bosschaerts
- Department of Molecular and Cellular Interactions, VIB, Brussels, Belgium
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Martin Guilliams
- Department of Molecular and Cellular Interactions, VIB, Brussels, Belgium
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Benoît Stijlemans
- Department of Molecular and Cellular Interactions, VIB, Brussels, Belgium
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Yannick Morias
- Department of Molecular and Cellular Interactions, VIB, Brussels, Belgium
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Daniel Engel
- Institute for Molecular Medicine and Experimental Immunology, University Clinic of Bonn, Bonn, Germany
| | - Frank Tacke
- Department of Medicine III, RWTH-University Hospital Aachen, Aachen, Germany
| | - Michel Hérin
- Cell and Tissue Laboratory, Unité de Recherche en Physiologie Moléculaire, Facultés Universitaires Notre-Dame de la Paix, Namur, Belgium
| | - Patrick De Baetselier
- Department of Molecular and Cellular Interactions, VIB, Brussels, Belgium
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Alain Beschin
- Department of Molecular and Cellular Interactions, VIB, Brussels, Belgium
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel, Brussels, Belgium
- * E-mail:
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Urbaniak M, Kuświk P, Kurant Z, Tekielak M, Engel D, Lengemann D, Szymański B, Schmidt M, Aleksiejew J, Maziewski A, Ehresmann A, Stobiecki F. Domain-wall movement control in Co/Au multilayers by He(+)-ion-bombardment-induced lateral coercivity gradients. Phys Rev Lett 2010; 105:067202. [PMID: 20868002 DOI: 10.1103/physrevlett.105.067202] [Citation(s) in RCA: 5] [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: 05/21/2010] [Indexed: 05/29/2023]
Abstract
Defined perpendicular anisotropy gradients in the Co sublayers of a [Co(0.6 nm)/Au(2 nm)](3) sputter-deposited multilayer have been introduced by light ion bombardment through a wedged Au stopper layer. Within such a layer system, domain walls between up- and down-magnetized areas are controllably movable by an external perpendicular homogeneous magnetic field. This method and layer system is very promising for a controlled magnetic particle transport within the stray fields of the moving domain walls.
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Affiliation(s)
- M Urbaniak
- Institute of Molecular Physics, Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland.
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Engel D, Beckers L, Wijnands E, Daemen M, Stan R, Biessen E, Lutgens E. W52 PROTECTION AGAINST ATHEROSCLEROSIS IN CAV-1 IS DUE TO CAV-1−/− IN NON-HEMATOPOIETIC CELLS. ATHEROSCLEROSIS SUPP 2010. [DOI: 10.1016/s1567-5688(10)70053-2] [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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Ruch M, Brade J, Schoeber C, Kraus-Tiefenbacher U, Schnitzer A, Engel D, Wenz F, Sütterlin M, Schoenberg S, Wasser K. Long-term follow-up-findings in mammography and ultrasound after intraoperative radiotherapy (IORT) for breast cancer. Breast 2009; 18:327-34. [DOI: 10.1016/j.breast.2009.09.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Revised: 09/09/2009] [Accepted: 09/11/2009] [Indexed: 10/20/2022] Open
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Engel D. WE-D-211A-03: Congress, Medical Physics, and You. Med Phys 2009. [DOI: 10.1118/1.3182507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Maegele M, Engel D, Bouillon B, Lefering R, Fach H, Raum M, Buchheister B, Schaefer U, Klug N, Neugebauer E. Incidence and outcome of traumatic brain injury in an urban area in Western Europe over 10 years. Eur Surg Res 2007; 39:372-9. [PMID: 17690556 DOI: 10.1159/000107097] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2007] [Accepted: 06/04/2007] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Valid epidemiological data on incidence and outcome of traumatic brain injury (TBI) show great variability. A study on incidence, severity and outcome of TBI was conducted in an urban area of one million inhabitants. MATERIALS AND METHODS 130,000 prehospital emergencies were screened for TBI. INCLUSION CRITERIA Glasgow Coma Scale (GCS) score <or=8 and/or Abbreviated Injury Scale for head injuries (AIS(head)) score >or=2 with confirmed TBI via appropriate diagnostics. RESULTS Annual incidence was 7.3/100,000. Overall mortality rate was 45.8%: 182 (28%) were prehospital deaths, 116 (17.8%) patients died in hospital. Two hundred and fourteen of 352 (60.8%) surviving patients were sufficiently rehabilitated at discharge [Glasgow Outcome Scale (GOS) score = 1], but 138 patients (39.2%) survived with persisting deficits. GOS was associated with initial GCS and AIS(head). CONCLUSION The incidence of TBI was lower compared to the literature. The overall mortality was high, especially prehospital and early in-hospital mortality rates.
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Affiliation(s)
- M Maegele
- Department of Surgery, Cologne-Merheim Medical Center, University of Witten-Herdecke, Cologne, Germany.
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Plesnila N, von Baumgarten L, Retiounskaia M, Engel D, Ardeshiri A, Zimmermann R, Hoffmann F, Landshamer S, Wagner E, Culmsee C. Delayed neuronal death after brain trauma involves p53-dependent inhibition of NF-kappaB transcriptional activity. Cell Death Differ 2007; 14:1529-41. [PMID: 17464322 DOI: 10.1038/sj.cdd.4402159] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Acute and chronic neurodegeneration, for example, following brain injury or Alzheimer's disease, is characterized by programmed death of neuronal cells. The present study addresses the role and interaction of p53- and NF-kappaB-dependent mechanisms in delayed neurodegeneration following traumatic brain injury (TBI). After experimental TBI in mice p53 rapidly accumulated in the injured brain tissue and translocated to the nucleus of damaged neurons, whereas NF-kappaB transcriptional activity simultaneously declined. Post-traumatic neurodegeneration correlated with the increase in p53 levels and was significantly reduced by the selective p53 inhibitor pifithrin-alpha (PFT). Strikingly, this protective effect was observed even when PFT treatment was delayed up to 6 h after trauma. Inhibition of p53 activity resulted in the concomitant increase in NF-kappaB transcriptional activity and upregulation of NF-kappaB-target proteins, for example X-chromosomal-linked inhibitor of apoptosis (XIAP). It is interesting to note that inhibition of XIAP abolished the neuroprotective effects of PFT in cultured neurons exposed to camptothecin, glutamate, or oxygen glucose deprivation. In conclusion, delayed neuronal cell death after brain trauma is mediated by p53-dependent mechanisms that involve inhibition of NF-kappaB transcriptional activity. Hence, p53 inhibition provides a promising approach for the treatment of acute brain injury, since it blocks apoptotic pathways and concomitantly triggers survival signaling with a therapeutic window relevant for clinical applications.
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Affiliation(s)
- N Plesnila
- Department of Neurosurgery, Institute for Surgical Research, University of Munich Medical Center - Grosshadern, Munich, Germany
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Engel D, Dobrindt U, Tittel A, Peters P, Maurer J, Gütgemann I, Kaissling B, Kuziel W, Jung S, Kurts C. Tumor necrosis factor alpha- and inducible nitric oxide synthase-producing dendritic cells are rapidly recruited to the bladder in urinary tract infection but are dispensable for bacterial clearance. Infect Immun 2006; 74:6100-7. [PMID: 16966414 PMCID: PMC1695502 DOI: 10.1128/iai.00881-06] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [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: 06/02/2006] [Revised: 07/24/2006] [Accepted: 08/10/2006] [Indexed: 01/18/2023] Open
Abstract
The role of dendritic cells (DC) in urinary tract infections (UTI) is unknown. These cells contribute directly to the innate defense against various viral and bacterial infections. Here, we studied their role in UTI using an experimental model induced by transurethral instillation of the uropathogenic Escherichia coli (UPEC) strain 536 into C57BL/6 mice. While few DC were found in the uninfected bladder, many had been recruited after 24 h, mostly to the submucosa and uroepithelium. They expressed markers of activation and maturation and exhibited the CD11b+ F4/80+ CD8- Gr-1- myeloid subtype. Also, tumor necrosis factor alpha (TNF-alpha)- and inducible nitric oxide synthase (iNOS)-producing CD11bINT DC (Tip-DC) were detected, which recently were proposed to be critical in the defense against bacterial infections. However, Tip-DC-deficient CCR2-/- mice did not show reduced clearance of UPEC from the infected bladder. Moreover, clearance was also unimpaired in CD11c-DTR mice depleted of all DC by injection of diphtheria toxin. This may be explained by the abundance of granulocytes and of iNOS- and TNF-alpha-producing non-DC that were able to replace Tip-DC functionality. These findings demonstrate that some of the abundant DC recruited in UTI contributed innate immune effector functions, which were, however, dispensable in the microenvironment of the bladder.
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Affiliation(s)
- Daniel Engel
- Institute for Molecular Medicine and Experimental Immunology, University Clinic of Bonn, Sigmund-Freud-Str. 25, D-53105 Bonn, Germany
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Koscielny AJ, Engel D, Wehner S, Kurts C, Kalff J. Intestinal dendritic cells (DC) and CCR7 are centrally involved in the gastrointestinal field effect. J Am Coll Surg 2006. [DOI: 10.1016/j.jamcollsurg.2006.05.037] [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: 11/29/2022]
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Brahmi D, Dehlendorf C, Engel D. Abortion training in family medicine residency programs. Contraception 2005. [DOI: 10.1016/j.contraception.2005.06.018] [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: 11/26/2022]
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Eggers G, Wirtz C, Korb W, Engel D, Schorr O, Kotrikova B, Raczkowsky J, Wörn H, Mühling J, Hassfeld S, Marmulla R. Robot-Assisted Craniotomy. ACTA ACUST UNITED AC 2005; 48:154-8. [PMID: 16015492 DOI: 10.1055/s-2005-870908] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
In the Special Research Centre 414 of the German Research Funding (DFG, Bonn) a system for robot-assisted cranial surgery was developed. It is designed for the accurate and safe execution of craniotomies and repositioning of bone pieces. The system is intended for use in the surgical therapy of craniosynostosis. Preoperatively, CT imaging is performed. In a computerized planning system the position and shape of the intended craniotomy is intuitively planned on a virtual model of the patient's skull. Intraoperatively, after conventional removal of the covering soft tissue, the robot performs the craniotomy autonomously. Extensive testing in phantom studies and animal tests confirmed the reliability and accuracy of the system. A thorough risk analysis of the system was performed. In this paper, the first clinical use of the system on a patient is described and the clinical importance is discussed.
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Affiliation(s)
- G Eggers
- Department of Oral and Craniomaxillofacial Surgery, Heidelberg University, Heidelberg, Germany.
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Lang A, Benke D, Eitner F, Engel D, Ehrlich S, Breloer M, Hamilton-Williams E, Specht S, Hoerauf A, Floege J, von Bonin A, Kurts C. Heat shock protein 60 is released in immune-mediated glomerulonephritis and aggravates disease: in vivo evidence for an immunologic danger signal. J Am Soc Nephrol 2004; 16:383-91. [PMID: 15601747 DOI: 10.1681/asn.2004040276] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Heat shock proteins (Hsp) are ubiquitous intracellular proteins that can be released in various forms of cellular stress. Some Hsp, such as Hsp60, have been shown to stimulate directly T cell-mediated immune responses in vitro. Here, it is demonstrated that Hsp60 is released from the kidneys and excreted into the urine of mice with nephrotoxic nephritis (NTN), a model of rapidly progressive glomerulonephritis. For examining the functional relevance of Hsp60 release, this protein was injected into mice with subnephritogenic NTN, in which only transient proteinuria and minimal organ damage occur that do not progress to terminal kidney failure. Injection of Hsp60 strikingly aggravated disease, as evidenced by global glomerular necrosis, tubulointerstitial damage, and complete anuria after 10 to 12 d. This effect was mediated neither by endotoxin contaminations of Hsp60 nor by autologous antibodies. It was strictly T cell dependent but not associated with a systemic Th1/Th2 shift. Thus, Hsp60 is an endogenous mediator stimulating immune effector mechanisms that contribute to the progression of NTN. These findings demonstrate in vivo that Hsp60 fulfills criteria of immunologic danger signals and suggest that such signals may be involved in immune-mediated kidney disease.
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Affiliation(s)
- Andreas Lang
- Institute of Molecular Medicine and Experimental Immunology, Friedrich-Wilhelms-Universität, 53105 Bonn, Germany
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Krüger T, Benke D, Eitner F, Lang A, Wirtz M, Hamilton-Williams EE, Engel D, Giese B, Müller-Newen G, Floege J, Kurts C. Identification and functional characterization of dendritic cells in the healthy murine kidney and in experimental glomerulonephritis. J Am Soc Nephrol 2004; 15:613-21. [PMID: 14978163 DOI: 10.1097/01.asn.0000114553.36258.91] [Citation(s) in RCA: 203] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The kidney tubulointerstitium contains numerous bone marrow-derived antigen-presenting cells, which are often referred to as resident tissue macrophages, although several previous studies had demonstrated characteristics of dendritic cells (DC). In this study, we describe a subset of tubulointerstitial cells expressing the DC marker CD11c. A protocol was established to isolate these cells for in vitro analysis. Renal CD11c(+) cells resembled splenic DC, but not peritoneal macrophages, in morphology, lysosomal content, phagocytic activity, microbicidal effector functions, expression of T cell costimulatory molecules, and ability to activate T cells. Nevertheless, many CD11c(+) renal cells expressed low or intermediate levels of F4/80 and CD11b, indicating that both markers are not absolutely specific for macrophages in the kidney. Subpopulations of renal DC could be distinguished based on their expression of MHC class II and costimulatory molecules and may represent different maturation stages. In nephrotoxic glomerulonephritis, increased numbers of CD11c(+) cells showing DC functionality were found in the tubulointerstitium. Focal accumulation was seen within tubulointerstitial mononuclear infiltrates and adjacent to, but not within, inflamed glomeruli. These results are the first to identify and characterize renal CD11c(+) cells as DC and to demonstrate marked changes in experimental glomerulonephritis.
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Affiliation(s)
- Thilo Krüger
- Department of Nephrology and Clinical Immunology, University Clinic of Aachen, Aachen, Germany
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Towers SK, Gloveli T, Traub RD, Driver JE, Engel D, Fradley R, Rosahl TW, Maubach K, Buhl EH, Whittington MA. Alpha 5 subunit-containing GABAA receptors affect the dynamic range of mouse hippocampal kainate-induced gamma frequency oscillations in vitro. J Physiol 2004; 559:721-8. [PMID: 15284346 PMCID: PMC1665170 DOI: 10.1113/jphysiol.2004.071191] [Citation(s) in RCA: 59] [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] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Though all in vitro models of gamma frequency network oscillations are critically dependent on GABAA receptor-mediated synaptic transmission little is known about the specific role played by different subtypes of GABAA receptor. Strong expression of the alpha5 subunit of the GABAA receptor is restricted to few brain regions, amongst them the hippocampal dendritic layers. Receptors containing this subunit may be expressed on the extrasynaptic membrane of principal cells and can mediate a tonic GABAA conductance. Using hippocampal slices of wild-type (WT) and alpha5-/- mice we investigated the role of alpha5 subunits in the generation of kainate-induced gamma frequency oscillations (20-80 Hz). The change in power of the oscillations evoked in CA3 by increasing network drive (kainate, 50-400 nm) was significantly greater in alpha5-/- than in WT slices. However, the change in frequency of gamma oscillations with increasing network drive seen in WT slices was absent in alpha5-/- slices. Raising the concentration of extracellular GABA by bathing slices in the GABA transaminase inhibitor vigabatrin and blocking uptake with tiagabine reduced the power of gamma oscillations more in WT slices than alpha5-/- slices (43%versus 15%). The data suggest that loss of this GABAA receptor subunit alters the dynamic profile of gamma oscillations to changes in network drive, possibly via actions of GABA at extrasynaptic receptors.
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Affiliation(s)
- S K Towers
- School of Biomedical Sciences, University of Leeds, LS2 9NQ, UK
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Eggers G, Korb W, Engel D, Schorr O, Marmulla R, Hassfeld S. Ein Robotersystem für den Einsatz in der craniofazialen Chirurgie. Laryngorhinootologie 2004. [DOI: 10.1055/s-2004-823578] [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: 10/19/2022]
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Korb W, Engel D, Boesecke R, Eggers G, Marmulla R, O'Sullivan N, Raczkowsky J, Hassfeld S. Risk analysis for a reliable and safe surgical robot system. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0531-5131(03)00402-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Engel D, Heurich T, Raczkowsky J, Hassfeld S, Wörn H. [Robot-assisted surgical suite]. BIOMED ENG-BIOMED TE 2003; 47 Suppl 1 Pt 2:942-5. [PMID: 12465351 DOI: 10.1515/bmte.2002.47.s1b.942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- D Engel
- Institut für Prozessrechentechnik, Automation und Robotik (IPR), Universität Karlsruhe (TH), Deutschland
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Wehmöller M, Eufinger H, Hassfeld S, Raczkowsky J, Engel D, Weihe S. [Cadaver study: robot-assisted cranial resection and implantation of titanium plates]. BIOMED ENG-BIOMED TE 2003; 47 Suppl 1 Pt 1:19-21. [PMID: 12451761 DOI: 10.1515/bmte.2002.47.s1a.19] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A processing chain for the prefabrication of individual titanium implants for cranioplasty was developed at the Ruhr-University Bochum. In patients with tumours a simultaneous resection of cranial bone and insertion of the individual implant is desirable. At first resection templates were used for this. New developments aim at a preoperative definition of resection trajectories for surgical robots corresponding to both the planning of the resection and the implant. This study used ovine cadaver skulls for robot resection experiments. The results demonstrate possible applications, limitations and necessary prerequisites in robot assisted cranial surgery.
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Affiliation(s)
- M Wehmöller
- Lehrstuhl für Produktionssysteme, Ruhr-Universität Bochum.
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