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Kyselyova AA, Frölich AM, Bester M, Brekenfeld C, Buhk JH, Ding A, Nagl F, Jost TJ, Guerreiro H, Ngo NT, Fiehler J, Flottmann F. Evaluation of intracranial stenting in a simulated training and assessment environment for neuroendovascular procedures. Front Neurol 2023; 14:1247421. [PMID: 37727579 PMCID: PMC10506405 DOI: 10.3389/fneur.2023.1247421] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 08/24/2023] [Indexed: 09/21/2023] Open
Abstract
Purpose Given the inherent complexity of neurointerventional procedures and the associated risks of ionizing radiation exposure, it is crucial to prioritize ongoing training and improve safety protocols. The aim of this study is to assess a training and evaluation in-vitro environment using a vascular model of M1 stenosis, within a clinical angiography suite, without relying on animal models or X-ray radiation. Materials and methods Using a transparent model replicating M1 stenosis, we conducted intracranial stenting procedures with four different setups (Gateway & Wingspan, Gateway & Enterprise, Neurospeed & Acclino, and Pharos Vitesse). A video camera was integrated with the angiography system's monitor for real-time visualization, while a foot switch was employed to simulate live fluoroscopy. Three neuroradiologists with varying levels of expertise performed each procedure for three times. The total duration of fluoroscopy as well as the time from passing the stenosis with the wire to completion of the procedure were recorded using a dedicated software designed for this experimental setup. Results Compared to the Gateway & Wingspan procedure, the total fluoroscopy time reduced significantly with the Gateway & Enterprise, Neurospeed & Acclino, and Pharos Vitesse procedures by 51.56 s, 111.33 s, and 144.89 s, respectively (p < 0.001). Additionally, physicians with under 2 years and over 5 years of experience reduced FT by 62.83 s and 106.42 s, respectively, (p < 0.001), compared to a novice physician. Similar trends were noted for the time of wire distal to stenosis, with significant reductions for Neurospeed & Acclino and Pharos Vitesse compared to both Gateway & Wingspan as well as Gateway & Enterprise (all p < 0.001). Conclusion Procedures requiring wire exchange maneuvers exhibited nearly twice the fluoroscopy time in comparison to balloon-mounted stenting or stent-placement via PTA balloon catheters. The more experienced neuroradiologist demonstrated significantly quicker performance in line with expectations in a real-life clinical setting, when compared to the less experienced interventionalist. This in-vitro setup allowed the evaluation of alternative technical approaches and differences in experience of operators without the use of animal models or X-ray. The setup combines advantages of simulators and silicone vessel models in a realistic working environment.
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Affiliation(s)
- Anna A. Kyselyova
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Andreas M. Frölich
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Maxim Bester
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Caspar Brekenfeld
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jan-Hendrik Buhk
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Department of Neuroradiology, Asklepios Hospitals St. Georg and Wandsbek, Hamburg, Germany
| | - Andreas Ding
- Acandis, Acandis GmbH & Co. KG, Pforzheim, Germany
| | - Frank Nagl
- Acandis, Acandis GmbH & Co. KG, Pforzheim, Germany
| | | | - Helena Guerreiro
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ngoc Tuan Ngo
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jens Fiehler
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Fabian Flottmann
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Stahl J, Marsh LMM, Thormann M, Ding A, Saalfeld S, Behme D, Berg P. Assessment of the flow-diverter efficacy for intracranial aneurysm treatment considering pre- and post-interventional hemodynamics. Comput Biol Med 2023; 156:106720. [PMID: 36878124 DOI: 10.1016/j.compbiomed.2023.106720] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/08/2023] [Accepted: 02/26/2023] [Indexed: 03/02/2023]
Abstract
Endovascular treatment of intracranial aneurysms with flow diverters (FD) has become one of the most promising interventions. Due to its woven high-density structure they are particularly applicable for challenging lesions. Although several studies have already conducted realistic hemodynamic quantification of the FD efficacy, a comparison with morphologic post-interventional data is still missing. This study analyses the hemodynamics of ten intracranial aneurysm patients treated with a novel FD device. Based on pre- and post-interventional 3D digital subtraction angiography image data, patient-specific 3D models of both treatment states are generated applying open source threshold-based segmentation methods. Using a fast virtual stenting approach, the real stent positions available in the post-interventional data are virtually replicated and both treatment scenarios were characterized using image-based blood flow simulations. The results show FD-induced flow reductions at the ostium by a decrease in mean neck flow rate (51%), inflow concentration index (56%) and mean inflow velocity (53%). Intraluminal reductions in flow activity for time-averaged wall shear stress (47%) and kinetic energy (71%) are present as well. However, an intra-aneurysmal increase in flow pulsatility (16%) for the post-interventional cases can be observed. Patient-specific FD simulations demonstrate the desired flow redirection and activity reduction inside the aneurysm beneficial for thrombosis formation. Differences in the magnitude of hemodynamic reduction exist over the cardiac cycle which may be addressed in a clinical setting by anti-hypertensive treatment in selected cases.
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Affiliation(s)
- Janneck Stahl
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; Department of Fluid Dynamics and Technical Flows, University of Magdeburg, Magdeburg, 39106, Germany.
| | | | - Maximilian Thormann
- University Clinic for Neuroradiology, University Hospital Magdeburg, Magdeburg, 39120, Germany
| | | | - Sylvia Saalfeld
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; Department of Simulation and Graphics, University of Magdeburg, Magdeburg, 39106, Germany
| | - Daniel Behme
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; University Clinic for Neuroradiology, University Hospital Magdeburg, Magdeburg, 39120, Germany
| | - Philipp Berg
- Research Campus STIMULATE, University of Magdeburg, Magdeburg, 39106, Germany; Department of Medical Engineering, University of Magdeburg, Magdeburg, 39106, Germany
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Ding A, Machin M, Onida S, Davies A. 331 The Role of Prophylactic and Therapeutic Fasciotomy in Acute Limb Presentations. Br J Surg 2021. [DOI: 10.1093/bjs/znab134.547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Introduction
Acute compartment syndrome is a surgical emergency that can be of traumatic or non-traumatic nature. Missed or delayed diagnosis can cause significant morbidity. The aim of this systematic review was to assess outcomes following prophylactic and therapeutic fasciotomies performed for acute limb presentations.
Method
This systematic review was undertaken following a predefined protocol registered with PROSPERO, in accordance with PRISMA guidelines. Searches of MEDLINE and Embase databases retrieved 623 articles; 19 articles were included in the study. A qualitative synthesis was performed due to heterogeneity between the studies.
Results
Overall mortality rates of 0–19 % were reported for traumatic causes and 24.5–27% for non-traumatic causes. In general, comparative studies reported lower amputation rates (0–21.7% vs 6.6–50%) and neurological deficit rates in the prophylactic versus therapeutic fasciotomy arms (8.8–18% vs 12.5–42%). Complication rates of up to 42% and 35% were reported in traumatic and non-traumatic cases respectively, which included wound infection, nerve injury and ischaemic contractures.
Conclusions
Prophylactic fasciotomies appear to have superior outcomes than therapeutic ones. There is insufficient evidence for a specific time cut-off for the performance of therapeutic fasciotomies; retrospective analysis of outcomes via a fasciotomy registry may help to guide future practice.
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Affiliation(s)
- A Ding
- Imperial College London, London, United Kingdom
| | - M Machin
- Imperial College London, London, United Kingdom
| | - S Onida
- Imperial College London, London, United Kingdom
| | - A Davies
- Imperial College London, London, United Kingdom
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4
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Cattaneo G, Bräuner C, Siekmeyer G, Ding A, Bauer S, Wohlschlögel M, Lang L, Hierlemann T, Akimov M, Schlensak C, Schüßler A, Wendel HP, Krajewski S. Publisher Correction: In vitro investigation of chemical properties and biocompatibility of neurovascular braided implants. J Mater Sci Mater Med 2020; 31:106. [PMID: 33159600 PMCID: PMC7661396 DOI: 10.1007/s10856-020-06447-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Affiliation(s)
| | | | | | | | | | | | - Lisa Lang
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Teresa Hierlemann
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Maria Akimov
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Christian Schlensak
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | | | - Hans-Peter Wendel
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Stefanie Krajewski
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
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5
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Ding A, Onida S, Davies AH. The painful cost of cancelling surgery due to COVID-19- can we do anything about it? Br J Surg 2020; 107:e336. [PMID: 32662518 PMCID: PMC7404517 DOI: 10.1002/bjs.11786] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 01/31/2023]
Affiliation(s)
- A Ding
- Academic Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, Charing Cross Hospital, Fulham Palace Road, Hammersmith, London, W6 8RF
| | - S Onida
- Academic Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, Charing Cross Hospital, Fulham Palace Road, Hammersmith, London, W6 8RF
| | - A H Davies
- Academic Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, Charing Cross Hospital, Fulham Palace Road, Hammersmith, London, W6 8RF
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6
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Ding A, Braschkat A, Guber A, Cattaneo G. New Concept of Patient-specific Flow Diversion Treatment of Intracranial Aneurysms : Design Aspects and in vitro Fluid Dynamics. Clin Neuroradiol 2020; 31:671-679. [PMID: 32651611 DOI: 10.1007/s00062-020-00930-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 06/20/2020] [Indexed: 11/29/2022]
Abstract
PURPOSE Current flow diverter (FD) designs limit the possibilities to achieve ideal functional parameters for intra-aneurysmal flow alteration in the implanted state. In this work, we evaluate the technical feasibility of a new patient-specific FD concept and the impact on intra-aneurysmal flow reduction compared to standard FD. METHODS Based on a literature review, we defined functional requirements, followed by the design and manufacturing of two different prototypes, which we implanted in a patient-specific phantom model. Functional porosity distributions and contour parameters were evaluated in the implanted state and compared to standard FD. Subsequently, we carried out a series of particle image velocimetry (PIV) measurements, in order to assess the impact on intra-aneurysmal flow. RESULTS With both patient-specific prototypes, it was possible to achieve stronger intra-aneurysmal flow reductions in terms of maximum and mean velocity and vorticity than a standard FD; however, one design showed a strong sensitivity against malpositioning. Overall, fluid dynamics parameters correlated with geometrical aspects such as the porosity and its grade of homogeneity. Beyond that, we found influences by the FD contour projection within the aneurysm, especially connected to the formation of in-jets. CONCLUSION Our results show that there is a technically feasible concept, which enables a more specific adjustment of functional FD parameters and more effective intra-aneurysmal flow reduction. This could potentially lead to improvements in the efficacy of aneurysm occlusion in cases with challenging fluid dynamics.
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Affiliation(s)
- Andreas Ding
- Acandis GmbH, R&D, Pforzheim, Baden-Württemberg, Germany. .,, Weltzienstr. 24, 76135, Karlsruhe, Germany.
| | | | - Andreas Guber
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Karlsruhe, Baden-Württemberg, Germany
| | - Giorgio Cattaneo
- Institute of Biomedical Engineering, University of Stuttgart, Stuttgart, Baden-Württemberg, Germany
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7
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Yan C, Nie W, Vogel AL, Dada L, Lehtipalo K, Stolzenburg D, Wagner R, Rissanen MP, Xiao M, Ahonen L, Fischer L, Rose C, Bianchi F, Gordon H, Simon M, Heinritzi M, Garmash O, Roldin P, Dias A, Ye P, Hofbauer V, Amorim A, Bauer PS, Bergen A, Bernhammer AK, Breitenlechner M, Brilke S, Buchholz A, Mazon SB, Canagaratna MR, Chen X, Ding A, Dommen J, Draper DC, Duplissy J, Frege C, Heyn C, Guida R, Hakala J, Heikkinen L, Hoyle CR, Jokinen T, Kangasluoma J, Kirkby J, Kontkanen J, Kürten A, Lawler MJ, Mai H, Mathot S, Mauldin RL, Molteni U, Nichman L, Nieminen T, Nowak J, Ojdanic A, Onnela A, Pajunoja A, Petäjä T, Piel F, Quéléver LLJ, Sarnela N, Schallhart S, Sengupta K, Sipilä M, Tomé A, Tröstl J, Väisänen O, Wagner AC, Ylisirniö A, Zha Q, Baltensperger U, Carslaw KS, Curtius J, Flagan RC, Hansel A, Riipinen I, Smith JN, Virtanen A, Winkler PM, Donahue NM, Kerminen VM, Kulmala M, Ehn M, Worsnop DR. Size-dependent influence of NO x on the growth rates of organic aerosol particles. Sci Adv 2020; 6:eaay4945. [PMID: 32518819 PMCID: PMC7253163 DOI: 10.1126/sciadv.aay4945] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 03/19/2020] [Indexed: 05/24/2023]
Abstract
Atmospheric new-particle formation (NPF) affects climate by contributing to a large fraction of the cloud condensation nuclei (CCN). Highly oxygenated organic molecules (HOMs) drive the early particle growth and therefore substantially influence the survival of newly formed particles to CCN. Nitrogen oxide (NOx) is known to suppress the NPF driven by HOMs, but the underlying mechanism remains largely unclear. Here, we examine the response of particle growth to the changes of HOM formation caused by NOx. We show that NOx suppresses particle growth in general, but the suppression is rather nonuniform and size dependent, which can be quantitatively explained by the shifted HOM volatility after adding NOx. By illustrating how NOx affects the early growth of new particles, a critical step of CCN formation, our results help provide a refined assessment of the potential climatic effects caused by the diverse changes of NOx level in forest regions around the globe.
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Affiliation(s)
- C. Yan
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - W. Nie
- Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, China
| | - A. L. Vogel
- CERN, CH-1211, Geneva, Switzerland
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - L. Dada
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - K. Lehtipalo
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
- Finnish Meteorological Institute, Erik Palménin aukio 1, 00560 Helsinki, Finland
| | - D. Stolzenburg
- University of Vienna, Faculty of Physics, Boltzmanngasse 5, 1090 Wien, Austria
| | - R. Wagner
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - M. P. Rissanen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - M. Xiao
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - L. Ahonen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - L. Fischer
- University of Innsbruck, Institute for Ion and Applied Physics, 6020 Innsbruck, Austria
| | - C. Rose
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - F. Bianchi
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
- Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China
| | - H. Gordon
- CERN, CH-1211, Geneva, Switzerland
- University of Leeds, Leeds LS2 9JT, UK
| | - M. Simon
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - M. Heinritzi
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - O. Garmash
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - P. Roldin
- Division of Nuclear Physics, Department of Physics, Lund University, P. O. Box 118, SE-221 00 Lund, Sweden
| | - A. Dias
- CERN, CH-1211, Geneva, Switzerland
- CENTRA and FCUL, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - P. Ye
- Carnegie Mellon University Center for Atmospheric Particle Studies, 5000 Forbes Ave., Pittsburgh, PA 15213, USA
- Aerodyne Research Inc., Billerica, MA 01821, USA
| | - V. Hofbauer
- Carnegie Mellon University Center for Atmospheric Particle Studies, 5000 Forbes Ave., Pittsburgh, PA 15213, USA
| | - A. Amorim
- CENTRA and FCUL, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - P. S. Bauer
- University of Vienna, Faculty of Physics, Boltzmanngasse 5, 1090 Wien, Austria
| | - A. Bergen
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - A.-K. Bernhammer
- University of Innsbruck, Institute for Ion and Applied Physics, 6020 Innsbruck, Austria
| | - M. Breitenlechner
- University of Innsbruck, Institute for Ion and Applied Physics, 6020 Innsbruck, Austria
| | - S. Brilke
- University of Vienna, Faculty of Physics, Boltzmanngasse 5, 1090 Wien, Austria
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - A. Buchholz
- University of Eastern Finland, Department of Applied Physics, P.O. Box 1627, 70211 Kuopio, Finland
| | - S. Buenrostro Mazon
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | | | - X. Chen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - A. Ding
- Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, China
| | - J. Dommen
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - D. C. Draper
- Department of Chemistry, University of California, Irvine, CA 92697, USA
| | - J. Duplissy
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - C. Frege
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - C. Heyn
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - R. Guida
- CERN, CH-1211, Geneva, Switzerland
| | - J. Hakala
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - L. Heikkinen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - C. R. Hoyle
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - T. Jokinen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - J. Kangasluoma
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
- Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China
| | - J. Kirkby
- CERN, CH-1211, Geneva, Switzerland
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - J. Kontkanen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - A. Kürten
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - M. J. Lawler
- Department of Chemistry, University of California, Irvine, CA 92697, USA
| | - H. Mai
- California Institute of Technology, 210-41, Pasadena, CA 91125, USA
| | | | - R. L. Mauldin
- Carnegie Mellon University Center for Atmospheric Particle Studies, 5000 Forbes Ave., Pittsburgh, PA 15213, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA
| | - U. Molteni
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - L. Nichman
- School of Earth and Environmental Science, University of Manchester, Manchester M13 9PL, UK
| | - T. Nieminen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - J. Nowak
- Aerodyne Research Inc., Billerica, MA 01821, USA
| | - A. Ojdanic
- University of Vienna, Faculty of Physics, Boltzmanngasse 5, 1090 Wien, Austria
| | | | - A. Pajunoja
- University of Eastern Finland, Department of Applied Physics, P.O. Box 1627, 70211 Kuopio, Finland
| | - T. Petäjä
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
- Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, China
| | - F. Piel
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - L. L. J. Quéléver
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - N. Sarnela
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - S. Schallhart
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | | | - M. Sipilä
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - A. Tomé
- IDL Universidade da Beira Interior, Covilhã, Portugal
| | - J. Tröstl
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - O. Väisänen
- University of Eastern Finland, Department of Applied Physics, P.O. Box 1627, 70211 Kuopio, Finland
| | - A. C. Wagner
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - A. Ylisirniö
- University of Eastern Finland, Department of Applied Physics, P.O. Box 1627, 70211 Kuopio, Finland
| | - Q. Zha
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - U. Baltensperger
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | | | - J. Curtius
- Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - R. C. Flagan
- California Institute of Technology, 210-41, Pasadena, CA 91125, USA
| | - A. Hansel
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
- University of Innsbruck, Institute for Ion and Applied Physics, 6020 Innsbruck, Austria
- IONICON GesmbH, Innsbruck, Austria
| | - I. Riipinen
- Department of Environmental Science and Analytical Chemistry (ACES) and Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, Sweden
| | - J. N. Smith
- Department of Chemistry, University of California, Irvine, CA 92697, USA
| | - A. Virtanen
- University of Eastern Finland, Department of Applied Physics, P.O. Box 1627, 70211 Kuopio, Finland
| | - P. M. Winkler
- University of Vienna, Faculty of Physics, Boltzmanngasse 5, 1090 Wien, Austria
| | - N. M. Donahue
- Carnegie Mellon University Center for Atmospheric Particle Studies, 5000 Forbes Ave., Pittsburgh, PA 15213, USA
| | - V.-M. Kerminen
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - M. Kulmala
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
- Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, China
- Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China
- Helsinki Institute of Physics, FI-00014 Helsinki, Finland
| | - M. Ehn
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
| | - D. R. Worsnop
- Institute for Atmospheric and Earth System Research/INAR–Physics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
- Aerodyne Research Inc., Billerica, MA 01821, USA
- University of Eastern Finland, Department of Applied Physics, P.O. Box 1627, 70211 Kuopio, Finland
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Zhu Y, Zhu WP, Li W, Zhang HT, Chen BH, Ding A, Yang H, Zhang H. [Implications of EET in renal ischemia/reperfusion by regulating NLRP3 expression and pyroptosis]. Zhonghua Yi Xue Za Zhi 2020; 100:779-784. [PMID: 32192293 DOI: 10.3760/cma.j.cn112137-20190803-01731] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the mechanism of epoxyeicosatrienoic acids (EET) on renal ischemia/reperfusion (I/R). Methods: Thirty 10-week male C57BL6 mice were randomly divided into five groups: sham goup, I/R group, I/R with EET group, I/R with toll-like receptor 4 (TLR4) inhibitor (TAK242) group, I/R with EET and TAK242 group. Blood urea nitrogen (BUN) and serum creatinine (Scr) as well as renal pathological changes were observed 24 h after reperfusion. The protein expression of NOD-like receptor pyrin domain containing 3 (NLRP3), cysteinyl aspartate specific proteinase 1 (caspase-1), interleukin-1β (IL-1β), TLR4 and myeloid differentiation factor 88 (MyD88) were evaluated using Western blot. Results: Severe renal tubular epithelial cell injury and decreased renal function [BUN:(10.37±0.53) vs (6.70±0.82)mmol/L, t=9.17, P<0.001; Scr: (83.67±3.88) vs (32.50±3.51)μmol/L, t=23.96, P<0.001] occurred in I/R group. Compared to the sham group, the relative expression of NLRP3 (1.54±0.10 vs 0.71±0.05, t=13.14, P<0.001), caspase-1 (2.35±0.05 vs 0.62±0.02, t=73.77, P<0.001), IL-1β (3.11±0.11 vs 1.26±0.05, t=35.97, P<0.001), TLR4 (1.58±0.03 vs 0.39±0.01, t=86.00, P<0.001), MyD88 (0.94±0.02 vs 0.26±0.01, t=72.61, P<0.001) were significantly increased. Mice pretreated with EET analog featured lower kidney damage and diminished levels of above proteins than I/R group (all P<0.001). Besides, the co-administration of TAK242 and EET analog could even markedly reduced the expression levels of each proteins than those in I/R group and I/R with EET group (all P<0.001). Conclusion: EET exerts a protective effect on attenuating renal I/R injury possibly through inhibiting TLR4 pathway to regulate the activation of NLRP3-induced pyroptosis.
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Affiliation(s)
- Y Zhu
- Department of Nephrology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - W P Zhu
- Department of Nephrology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - W Li
- Department of Pathology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - H T Zhang
- Department of Peripheral Vascular Intervention, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - B H Chen
- Department of Nephrology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - A Ding
- Department of Nephrology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - H Yang
- Department of Rheumatology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
| | - H Zhang
- Department of Rheumatology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, China
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10
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Cattaneo G, Bräuner C, Siekmeyer G, Ding A, Bauer S, Wohlschlögel M, Lang L, Hierlemann T, Akimov M, Schlensak C, Schüßler A, Wendel HP, Krajewski S. In vitro investigation of chemical properties and biocompatibility of neurovascular braided implants. J Mater Sci Mater Med 2019; 30:67. [PMID: 31165278 PMCID: PMC7695648 DOI: 10.1007/s10856-019-6270-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 05/06/2019] [Accepted: 05/18/2019] [Indexed: 06/02/2023]
Abstract
Braiding of Nitinol micro wires is an established technology for the manufacturing of fine-meshed neurovascular implants for tortuous vessel geometries. Electropolishing of wires before the braiding process has the potential to improve the in vitro behaviour in terms of thrombogenicity and endothelial cell proliferation. In this study, we present the first in vitro investigation of braided electropolished/blue oxide Nitinol samples in a blood flow loop, showing a significantly lower activation of the coagulation pathway (represented by the TAT III marker) and a tendency towards reduced platelet adhesion. Furthermore, we applied the same surface treatment on flat disks and measured protein adhesion as well as endothelial cell proliferation. We compared our results to non-electropolished samples with a native oxide surface. While platelet deposition was reduced on electropolished/blue oxide surface, a significant increase of endothelial cell seeding was observed. Investigation of inflammatory marker expression in endothelial cells provided divergent results depending on the marker tested, demanding closer investigation. Surface analysis using Auger electron spectroscopy revealed a thin layer mainly consisting of titanium oxynitride or titanium oxide + titanium nitride as a potential cause of the improved biological performance. Translated to the clinical field of intracranial aneurysm treatment, the improved biocompatibility has the potential to increase both safety (low thrombogenicity) and effectiveness (aneurysm neck reconstruction).
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Affiliation(s)
| | | | | | | | | | | | - Lisa Lang
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Teresa Hierlemann
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Maria Akimov
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Christian Schlensak
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | | | - Hans-Peter Wendel
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
| | - Stefanie Krajewski
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
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11
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Sanders J, Ding A, Samei E. TH-CD-207B-02: An Automated Technique to Measure Spatial Resolution in Clinical CT Images: Application to Patient Data. Med Phys 2016. [DOI: 10.1118/1.4958208] [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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12
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Wong O, Yuan J, Law M, Ding A, Yu S, Cheung K. SU-F-J-159: Influence of the Elevated Posterior Position by Using the Customized Vacuum-Bag On the Abdominal MR Image Quality: A Quantitative Phantom Study. Med Phys 2016. [DOI: 10.1118/1.4956067] [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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13
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Gonnella NC, Busacca CA, Zhang L, Saha A, Wu JP, Li G, Davis M, Offerdahl T, Jones PJ, Herfurth L, Reddig T, Wagner K, Niemann M, Werthmann U, Grupe J, Roos H, Reckzügel G, Ding A. Structure Elucidation of Poly-Faldaprevir: Polymer Backbone Solved Using Solid-State and Solution Nuclear Magnetic Resonance Spectroscopy. J Pharm Sci 2016; 105:1881-1890. [PMID: 27238486 DOI: 10.1016/j.xphs.2016.03.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 03/06/2016] [Accepted: 03/15/2016] [Indexed: 10/21/2022]
Abstract
A large-scale synthesis of the hepatitis C virus drug Faldaprevir revealed precipitation of an unknown insoluble solid from methanol solutions of the drug substance. The unknown impurity was determined to be a polymer of Faldaprevir based on analytical methods that included size exclusion chromatography in combination with electrospray ionization mass spectrometry, solution nuclear magnetic resonance (NMR), matrix-assisted laser desorption ionization-time of flight, ultracentrifugation, elemental analysis, and sodium quantitation by atom absorption spectroscopy. Structure elucidation of the polymeric backbone was achieved using solid-state NMR cross-polarization/magic angle spinning (CP/MAS), cross polarization-polarization inversion, and heteronuclear correlation (HETCOR) experiments. The polymerization was found to occur at the vinyl cyclopropane via a likely free radical initiation mechanism. Full proton and carbon chemical shift assignments of the polymer were obtained using solution NMR spectroscopy. The polymer structure was corroborated with chemical synthesis of the polymer and solution NMR analysis.
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Affiliation(s)
- Nina C Gonnella
- Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877.
| | - Carl A Busacca
- Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | - Li Zhang
- Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | - Anjan Saha
- Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | - Jiang-Ping Wu
- Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | - Guisheng Li
- Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | - Mark Davis
- Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | - Thomas Offerdahl
- Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | - Paul-James Jones
- Information Technology, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877
| | | | - Tim Reddig
- Boehringer Ingelheim Pharma GmbH & Co. KG, Germany
| | - Klaus Wagner
- Boehringer Ingelheim Pharma GmbH & Co. KG, Germany
| | | | | | - Julia Grupe
- Boehringer Ingelheim Pharma GmbH & Co. KG, Germany
| | - Helmut Roos
- Boehringer Ingelheim Pharma GmbH & Co. KG, Germany
| | | | - Andreas Ding
- Boehringer Ingelheim Pharma GmbH & Co. KG, Germany
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Jiang G, Li Z, Ding A, Zhou F, Jiao W, Tang D, Qiu W, Yue L, Xu W. Computed tomography-guided iodine-125 interstitial implantation as an alternative treatment option for lung cancer. Indian J Cancer 2015; 51 Suppl 2:e9-12. [PMID: 25712850 DOI: 10.4103/0019-509x.151999] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
PURPOSE The aim was to evaluate the safety, feasibility and efficacy of computed tomography (CT)-guided percutaneous interstitial brachytherapy using radioactive iodine-125 ( 125 I) seeds for the treatment of lung cancer. MATERIALS AND METHODS Included in this study were 45 male and 35 female patients aged 52-85 years (mean 72-year) who were diagnosed with lung cancer. Of the 80 cases of lung cancer, 38 were pathologically confirmed as squamous cell carcinoma, 29 as adenocarcinoma, 2 as small cell lung cancer, and 11 as metastatic lung cancer. Percutaneous interstitial implantation of radioactive 125 I seeds was performed under CT guidance. The treatment planning system was used to reconstruct three-dimensional images of the tumor to determine the quantity and distribution of 125 I seeds to be implanted. Under CT guidance, 125 I seeds were embedded into the tumor, with the matched peripheral dose set at 100-130 Gy. Follow-up CT scan was done in 2-month to explore the treatment efficacy. RESULTS The procedure was successful in all patients. No major procedure-associated death occurred. The duration of follow-up was 6-month. Complete response (CR) was seen in 38 cases (47.5%), partial response (PR) in 27 cases (33.75%), stable disease (SD) in 10 cases (12.5%), and progressive disease in 5 cases (6.25%), with a local control rate (CR + PR + SD) of 93.75%. The 2-, 4- and 6-month overall response rate (CR + PR) was 78%, 83% and 81%, respectively. CONCLUSION Implantation of CT-guided 125 I seeds is a safe and effective alternative option for the treatment of lung cancer.
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Affiliation(s)
| | | | | | | | | | | | | | | | - W Xu
- Department of Radiology, Affiliated Hospital of Qingdao University, Qingdao, China
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15
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Ding A, Han B, Bush K, Wang L, Xing L. SU-E-T-490: Independent Three-Dimensional (3D) Dose Verification of VMAT/SBRT Using EPID and Cloud Computing. Med Phys 2015. [DOI: 10.1118/1.4924852] [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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16
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Wong O, Lo G, Yuan J, Law M, Ding A, Cheng K, Chan K, Cheung K, Yu S. SU-E-J-231: Comparison of Delineation Variability of Soft Tissue Volume and Position in Head-And-Neck Between Two T1-Weighted Pulse Sequences Using An MR-Simulator with Immobilization. Med Phys 2015. [DOI: 10.1118/1.4924317] [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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17
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Law M, Yuan J, Lo G, Wong O, Ding A, Cheng K, Chan K, Cheung K, Yu S. TH-CD-207-12: A Phantom Study of MR Geometric Distortion and Its Orientation Dependency On a 1.5T MR-Simulator. Med Phys 2015. [DOI: 10.1118/1.4926270] [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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18
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Patel A, Ding A, Mirza F, Gyawali CP. Optimizing the high-resolution manometry (HRM) study protocol. Neurogastroenterol Motil 2015; 27:300-4. [PMID: 25557304 PMCID: PMC4756908 DOI: 10.1111/nmo.12494] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 11/23/2014] [Indexed: 12/16/2022]
Abstract
BACKGROUND Intolerance of the esophageal manometry catheter may prolong high-resolution manometry (HRM) studies and increase patient distress. We assessed the impact of obtaining the landmark phase at the end of the study when the patient has acclimatized to the HRM catheter. METHODS 366 patients (mean age 55.4 ± 0.8 years, 62.0% female) undergoing esophageal HRM over a 1-year period were studied. The standard protocol consisted of the landmark phase, 10 5 mL water swallows 20-30 s apart, and multiple rapid swallows where 4-6 2 mL swallows were administered in rapid succession. The modified protocol consisted of the landmark phase at the end of the study after test swallows. Study duration, technical characteristics, indications, and motor findings were compared between standard and modified protocols. KEY RESULTS Of the 366 patients, 89.6% underwent the standard protocol (study duration 12.9 ± 0.3 min). In 10.4% with poor catheter tolerance undergoing the modified protocol, study duration was significantly longer (15.6 ± 1.0 min, p = 0.004) despite similar duration of study maneuvers. Only elevated upper esophageal sphincter basal pressures at the beginning of the study segregated modified protocol patients. The 95th percentile time to landmark phase in the standard protocol patients was 6.1 min; as many as 31.4% of modified protocol patients could not obtain their first study maneuver within this period (p = 0.0003). Interpretation was not impacted by shifting the landmark phase to the end of the study. CONCLUSIONS & INFERENCES Modification of the HRM study protocol with the landmark phase obtained at the end of the study optimizes study duration without compromising quality.
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Affiliation(s)
- A. Patel
- Division of Gastroenterology; Washington University School of Medicine; Saint Louis MO USA
| | - A. Ding
- Division of Gastroenterology; Washington University School of Medicine; Saint Louis MO USA
| | - F. Mirza
- Division of Gastroenterology; Washington University School of Medicine; Saint Louis MO USA
| | - C. P. Gyawali
- Division of Gastroenterology; Washington University School of Medicine; Saint Louis MO USA
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19
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Han B, Ding A, Xing L, Wang L. Development of a High-Resolution and High-Efficiency Dosimetry Strategy for Robotic Radiosurgery QA. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2581] [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: 10/24/2022]
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20
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Ding A, Han B, Xing L. An EPID-based Dosimetric Verification Tool for Electron Beam Therapy. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2609] [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: 10/24/2022]
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21
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Mittmann HU, Weise HP, Ding A, Henglein A. Streuung von Ionen. III. Regenbogeneffekt bei der Streuung von H+ an N2 , CO, CO2 , SF6, H2 und CH4 sowie von H2
+ an Ar und Kr. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1971-0805] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Differential scattering cross sections of H+ on various molecules and of H2
+ on Ar and Kr were measured at various energies between 5 eV and 40 eV. Several rainbows could be resolved for the systems H+-N2, H+-CO, H+-CO2 and H+-SF6 . In the case of H+-H2 , secondary rainbows could be traced at higher energies (30 eV). Only the primary rainbow was observed for H+-CH4 . The H2
+-Ar and H2
+-Kr systems also yielded rainbow structures. Broad additional maxima appeared at large angles for H2
+-Kr which were atttributed to the crossing of potential curves. The rapid oscillations could not be observed. The measured differential cross sections for the systems H+-N2 , CO, CO2, SF6 and H2 were fitted by a procedure described in part I using a simple Morse potential. The equilibrium distances rm were estimated from the relation rm = 0.7-rg (rg: gaskinetic radius of the molecule) which was found to hold approximately for the H+-noble gas systems.
The following potential depths e were obtained: 4.15 eV for N2-H+; 4.70 eV for CO-H+; 5.10 eV for CO2-H+; 3.66 eV for SF6-H+; 4.04 eV for H2-H+. These values are averages because of the anisotropy of the potentials. The potential depth for the H+-H2 system is little smaller than the theoretical value of 4.56 eV. This is attributed to nontriangular configurations in the scattering process. The scattering experiments with the system H4-CH4 were evaluated classically, ε (H+-CH4) was found to be 3.8 eV only. The large difference to the theoretical value ε = 5.45 eV is explained by the inadiabacity of the scattering process with respect to the movement of the H atoms in methane.
ε (Ar-H2
+) and ε (KrH2
+) were found to be (1.3 ± 0.2 ) eV and (1.1 ± 0.2 ) eV, respectively. Energy level diagram are dicussed for the ion-molecule reactions Ar+ (Kr+) + H2 → ArH+ (KrH+) + H including the ArH2
+ and KrH2
+ intermediate states. They show that most of the reaction energy becomes free in the approach of the reactants Ar++H2. This effect is less pronounced for the Kr+ (2P1/2)+H2-reaction and even a small threshold energy exists for the Kr+ (2P3/2)+H2-reaction. reaction
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Affiliation(s)
- H.-U. Mittmann
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie Berlin, West-Germany
| | - H.-P. Weise
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie Berlin, West-Germany
| | - A. Ding
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie Berlin, West-Germany
| | - A. Henglein
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie Berlin, West-Germany
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Affiliation(s)
- A. Ding
- Hahn-Meitner-Institut für Kernforschung Berlin, Sektor Strahlenchemie Berlin-Wannsee
| | - A. Henglein
- Hahn-Meitner-Institut für Kernforschung Berlin, Sektor Strahlenchemie Berlin-Wannsee
| | - K. Lacmann
- Hahn-Meitner-Institut für Kernforschung Berlin, Sektor Strahlenchemie Berlin-Wannsee
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Weise HP, Mittmann HU, Ding A, Henglein A. Streuung von Ionen. II. Regenbogeneffekt bei der elastischen Streuung von Protonen an Helium, Neon, Krypton, Xenon und von He+ an Helium. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1971-0704] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Differential scattering cross sections of H+ on various noble gases and of He+ on He were measured at various energies between 3 eV-80 eV. The rainbow structure and the superimposed rapid oscillations were resolved. Differential cross sections were calculated in WKB approximation and compared with experimentally obtained cross sections. Agreement was obtained by using the modified Morse potential:
U = exp{2 G1 G2(1 -ρ)} -2 exp{G1 G2(1-ρ)} , G2 = 1 for ρ>1,
whit ρ=r/rm, and U=V/ε. G2 ≠ 1 for ρ ≧1,
The fitting procedure discussed in part I was applied in order to obtain the parameters ε,rm, G1 and G2. Calculations with the modified Lennard-Jones potential described in part I gave the same values for ε and rm .
With exception of the system H+ -Xe, a single set of parameters could describe the rainbow structure and the fine structure at all ion energies. The values for ε and rm agree fairly well with ab-initio calculations. The reduced potentials have about the same shape, G1 being between 2.7 and 2.2, G2 being between 0.8 and 0.9.
In the case of H+ -Xe, ε increases significantly with decreasing proton energy, while G1 and G2 have only slightly to be changed. The potential well is narrower than for the other systems mentioned above. These effects are attributed to the crossing of the potential curves of the systems H+ -Xe and H-Xe+ .
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Affiliation(s)
- H.-P. Weise
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie, 1 Berlin 39 West-Germany
| | - H.-U. Mittmann
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie, 1 Berlin 39 West-Germany
| | - A. Ding
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie, 1 Berlin 39 West-Germany
| | - A. Henglein
- Hahn-Meitner-Institut für Kernforschung Berlin GmbH, Sektor Strahlenchemie, 1 Berlin 39 West-Germany
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Abstract
The velocity spectra and cross sections of reactions of the type X*+D2 → XD++D (X+=Ar+, N2
+, CO+) have been found to be independent of the temperature of the target gas ( — 190° to 20°C). The additional forward scattering (as compared to spectator stripping) of the product ion at high energies cannot be explained by the thermal motion of the D2 molecules. A recoil stripping mechanism is proposed. At low energies, an intermediate XD2* is postulated that lives shorter than half a period of rotation and is forward scattered but quickly equilibrates the excess energy among the vibrational degrees of freedom. The reactions of Ar+ and N2
+ with CD4 can well be understood by the stripping model over a wide range of energy. At low energies, no preferential forward scattering of the product ion is found as in the corresponding reactions with D2. The strongly unsymmetric broadening of the product ion band together with a small shift to lower velocities indicate a strong interaction of the incident ion with the CD3 group at low energies. The formation of an intermediate complex XCD4
+ which isotropically decays is expected at energies of a few tenth of one eV. Direct measurements at such low primary ion energies have not yet been possible.
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Affiliation(s)
- A. Ding
- Hahn-Meitner-Institut für Kernforschung Berlin, Sektor Strahlenchemie, Berlin-Wannsee
| | - A. Henglein
- Hahn-Meitner-Institut für Kernforschung Berlin, Sektor Strahlenchemie, Berlin-Wannsee
| | - D. Hyatt
- Hahn-Meitner-Institut für Kernforschung Berlin, Sektor Strahlenchemie, Berlin-Wannsee
| | - K. Lacmann
- Hahn-Meitner-Institut für Kernforschung Berlin, Sektor Strahlenchemie, Berlin-Wannsee
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Han B, Ding A, Xing L, Wang L. TU-F-BRE-04: Development of a High-Resolution EPID Based Dosimetry Strategy for Radiosurgery QA. Med Phys 2014. [DOI: 10.1118/1.4889312] [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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26
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Ding A, Han B, Xing L. SU-E-T-456: Development of An EPID-Based Output Measurement and Dosimetric Verification Tool for Electron Beam Therapy. Med Phys 2014. [DOI: 10.1118/1.4888789] [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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Chen X, Bush K, Ding A, Xing L. TH-E-BRE-10: Independent Verification of Monitor Units for Volumetric Modulated Arc Therapy (VMAT). Med Phys 2014. [DOI: 10.1118/1.4889662] [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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28
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Bosse G, Ding A, Henglein A. Chemische Reaktionskinematik XIV Die Winkel- und Geschwindigkeitsverteilung für die Reaktion O2++ D2→ O2D++ D, und der Isotopieeffekt für die Reaktion mit HD. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.19710750504] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [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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Gao Y, Ding A, Caracappa P, Xu X. MO-D-134-01: K-Factors for Overweight and Obese Patients in CT Examinations as a Function of Body Mass Index. Med Phys 2013. [DOI: 10.1118/1.4815259] [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: 11/07/2022] Open
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Ding A, Gao Y, Caracappa P, Long D, Bolch W, Liu B, Kalra M, Xu X. TU-G-103-02: Clinical Evaluation of VirtualDose - a Software for Tracking and Reporting CTDI, DLP, Organ and Effective Dose for Adult and Pediatric Patient. Med Phys 2013. [DOI: 10.1118/1.4815471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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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Gao Y, Ding A, Zhang D, Liu B, Caracappa P, Xu X. TU-G-103-01: Monte Carlo Simulation and Dose Calculation of Chest CT Scan with Tube Current Modulation. Med Phys 2013. [DOI: 10.1118/1.4815470] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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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Su L, Liu T, Ding A, Xu X. WE-C-BRB-08: A GPU/CUDA Based Monte Carlo Code for Proton Transport: Preliminary Results of Proton Depth Dose in Water. Med Phys 2012. [DOI: 10.1118/1.4736101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [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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Ding A, Gao Y, Caracappa P, Liu B, Xu X. MO-F-213CD-03: Design and Testing of the VirtualDose Software Under the Software as a Service (SaaS) Platform for Tracking and Reporting CT Doses. Med Phys 2012. [DOI: 10.1118/1.4735828] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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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34
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Liu T, Ding A, Xu X. SU-E-T-493: Accelerated Monte Carlo Methods for Photon Dosimetry Using a Dual-GPU System and CUDA. Med Phys 2012; 39:3818. [DOI: 10.1118/1.4735582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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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35
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Liu T, Ding A, Xu X. MO-F-213CD-01: GPU-Based Monte Carlo Methods for Accelerating Radiographic and CT Imaging Dose Calculations: Feasibility and Scalability. Med Phys 2012. [DOI: 10.1118/1.4735826] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [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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36
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Ding A, Gao Y, Caracappa P, Long D, Bolch W, Xu X. WE-A-218-09: A Comprehensive CT Organ Dose Database for Weight-Specific Adult and Pediatric Patients. Med Phys 2012. [DOI: 10.1118/1.4736078] [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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Will IG, Ding A, Xu YB. Development of an in situ magnetoelastic magneto-optical Kerr effect magnetometer. Rev Sci Instrum 2012; 83:064707. [PMID: 22755651 DOI: 10.1063/1.4729572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Reported here is the development and implementation of an integrated in situ magnetoelastic measurement setup with a MOKE magnetometer, repositionable electromagnet, and sample transfer/straining device. The former were used within a molecular beam epitaxial vacuum growth chamber. Consequently the magnetostriction constants for both Cr capped and uncapped Fe/GaAs(100) films were acquired without film oxidization occurring. Samples were bent in a four point bending geometry to produce a quantifiable tensile mechanical strain on the films during magnetoelastic measurements. In addition, a laser measurement system was developed to confirm the induced strain in the samples.
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Affiliation(s)
- I G Will
- Electronics Department, University of York, Heslington, York YO10 5DD, United Kingdom
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38
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Gao Y, Ding A, Caracappa P, Xu X. SU-C-217A-03: Position Sensitivity of Calculated Dose-Length-Product-To-Effective- Dose Conversion Factors in Computed Tomography Examination. Med Phys 2012. [DOI: 10.1118/1.4734645] [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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39
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Ding A, Mille M, Caracappa P, Xu X. TH-A-214-04: Impact of Body Size of Obese Patients on PET/CT Dose Estimates: Monte Carlo Calculations Using a Set of BMI-Adjustable Phantoms. Med Phys 2011. [DOI: 10.1118/1.3613469] [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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40
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Ding A, Schulte N, Caracappa P, Xu X. TH-E-211-06: Further Development of VirtualDose Software for CT Dose Assessment: Realistic Phantoms and Smartphone User Interfaces. Med Phys 2011. [DOI: 10.1118/1.3613601] [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: 11/07/2022] Open
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41
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Caracappa P, Ding A, Gu J, Liu B, Xu X. TH-A-214-06: Organ Dose Weighting Methods for Tube Current Modulated CT Exams: Demonstration Using Adult Patient Phantoms. Med Phys 2011. [DOI: 10.1118/1.3613471] [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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42
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Brilot F, Merheb V, Ding A, Murphy T, Dale RC. Antibody binding to neuronal surface in Sydenham chorea, but not in PANDAS or Tourette syndrome. Neurology 2011; 76:1508-13. [PMID: 21411742 DOI: 10.1212/wnl.0b013e3182181090] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE To test the hypothesis that Sydenham chorea (SC) immunoglobulin G (IgG) autoantibodies bind to specific neuronal surface proteins, whereas IgG from patients with pediatric autoimmune neuropsychiatric disorders associated with streptococcal infection (PANDAS) or Tourette syndrome (TS) do not bind to neuronal surface proteins. METHODS We used live differentiated SH-SY5Y cells, which have neuronal and dopaminergic characteristics. Using flow cytometry, we measured serum IgG cell surface binding in patients with SC (n = 11), PANDAS (n = 12), and TS (n = 11), and compared the findings to healthy controls (n = 11) and other neurologic controls (n = 11). In order to determine the specificity of binding to neuronal antigens, we also used a non-neuronal cell line, HEK 293. RESULTS The mean IgG cell surface binding was significantly higher in the SC group compared to all other groups (p < 0.001). By contrast, there was no difference between the PANDAS or TS groups and the controls. Using the non-neuronal HEK-293 cells, there was no significant difference in IgG cell surface binding between any groups. CONCLUSIONS Serum autoantibodies that bind to neuronal cell surface antigens are present in SC, but not in PANDAS or TS. These findings strengthen the hypothesis that SC is due to a pathogenic autoantibody, but weaken the autoantibody hypothesis in PANDAS and TS.
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Affiliation(s)
- F Brilot
- Neuroimmunology Group, Institute for Neurosciences and Muscle Research, The Kids Research Institute at the Children's Hospital at Westmead, University of Sydney, Australia.
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Affiliation(s)
- R Challenor
- Department of GU Medicine, Derriford Hospital, Plymouth PL6 8DH, UK
| | - A Ding
- Department of GU Medicine, Derriford Hospital, Plymouth PL6 8DH, UK
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Ding A, Gu J, Caracappa P, Xu X. TH-C-201B-10: Development and Testing of a CT Dose Software “VirtualDose” Using Anatomically Realistic Patient Phantoms: Preliminary Results for the Phase I
of the Project. Med Phys 2010. [DOI: 10.1118/1.3469527] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [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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Na Y, Ding A, Caracappa P, Xu X. SU-GG-T-404: Demonstration of the Ability to Morph an Existing Whole-Body Phantom to a Different Individual. Med Phys 2010. [DOI: 10.1118/1.3468801] [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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46
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Han B, Ding A, Xu X, Bednarz B, Sharp G, Choi N, Chen G, Riper K. SU-GG-J-148: Evaluation of Performance of a Conceptual Time-Resolved Proton Range Telescope for In-Room Respiration Monitoring Using Monte Carlo Simulations and 4DCT Patient Data. Med Phys 2010. [DOI: 10.1118/1.3468371] [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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47
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Mille M, Gu J, Ding A, Xu X, Stabin M, Liu B, Treves S, Fahey F. SU-GG-I-68: Calculation and Evaluation of Internal and External Radiation Exposure to Adult and Pediatric Patients from PET/CT Examinations. Med Phys 2010. [DOI: 10.1118/1.3468101] [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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Ding A, Gu J, Mille M, Xu X, Wang Y, Trofimov A. TH-C-201B-04: Methods to Account for Imaging Doses from Diagnostic MDCT or Kilovoltage CBCT in Prostate Treatment Planning: Monte Carlo Studies Using Scanner Models and Patient-Specific Anatomy. Med Phys 2010. [DOI: 10.1118/1.3469521] [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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49
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Ding A, Lee A, Callender M, Loughrey M, Quah SP, Dinsmore WW. Hepatic encephalopathy as an unusual late complication of transjugular intrahepatic portosystemic shunt insertion for non-cirrhotic portal hypertension caused by nodular regenerative hyperplasia in an HIV-positive patient on highly active antiretroviral therapy. Int J STD AIDS 2010; 21:71-2. [PMID: 20029067 DOI: 10.1258/ijsa.2009.009038] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Transjugular intrahepatic portosystemic shunt (TIPS) is an artificially created conduit between the portal and systemic vascular system in the liver performed percutaneously via radiological guidance. It is used mainly in conditions causing portal hypertension and its resulting complications. It reduces portal pressure by diverting portal blood flow into the systemic circulation. Hepatic encephalopathy is the most common complication following TIPS insertion and tends to present fairly early. We describe a case of hepatic encephalopathy as an unusual late complication of TIPS insertion (first presenting six years after) for non-cirrhotic portal hypertension caused by nodular regenerative hyperplasia in an HIV-positive patient on highly active antiretroviral therapy.
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Affiliation(s)
- A Ding
- Liver Unit, Royal Victoria Hospital, Belfast, UK.
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50
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Pischon N, Mäki JM, Weisshaupt P, Heng N, Palamakumbura AH, N'Guessan P, Ding A, Radlanski R, Renz H, Bronckers TALJJ, Myllyharju J, Kielbassa AM, Kleber BM, Bernimoulin JP, Trackman PC. Lysyl oxidase (lox) gene deficiency affects osteoblastic phenotype. Calcif Tissue Int 2009; 85:119-26. [PMID: 19458888 PMCID: PMC2827261 DOI: 10.1007/s00223-009-9252-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Accepted: 04/16/2009] [Indexed: 01/01/2023]
Abstract
Lysyl oxidase (LOX) catalyzes cross-linking of elastin and collagen, which is essential for the structural integrity and function of bone tissue. The present study examined the role of Lox gene deficiency for the osteoblast phenotype in primary calvarial osteoblasts from E18.5 Lox knockout (Lox ( -/- )) and wild type (wt) (C57BL/6) mice. Next to Lox gene depletion, mRNA expression of Lox isoforms, LOXL1-4, was significantly downregulated in Lox ( -/- ) bone tissue. A significant decrease of DNA synthesis of Lox ( -/- ) osteoblasts compared to wt was found. Early stages of osteoblastic apoptosis studied by annexin-V binding as well as later stages of DNA fragmentation were not affected. However, mineral nodule formation and osteoblastic differentiation were markedly decreased, as revealed by significant downregulation of osteoblastic markers, type I collagen, bone sialoprotein, and Runx2/Cbfa1.
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Affiliation(s)
- N Pischon
- Department of Operative Dentistry and Periodontology, CharitéCentrum 3, University School of Dental Medicine, Charité - Universitätsmedizin Berlin, 14197 Berlin, Germany.
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