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Dietrich L, Kahmen A, Hoch G, Körner C. Reply to: The three-dimensional structure of wood enables horizontal water transport needed to conduct water around lesions. Sci Rep 2023; 13:15066. [PMID: 37699924 PMCID: PMC10497498 DOI: 10.1038/s41598-023-41785-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 08/31/2023] [Indexed: 09/14/2023] Open
Affiliation(s)
- Lars Dietrich
- Department of Environmental Sciences, University of Basel, Schönbeinstrasse 6, 4056, Basel, Switzerland.
- Agroecology and Organic Farming Group, Institute of Crop Science and Resource Conservation, University of Bonn, Auf dem Hügel 6, 53121, Bonn, Germany.
| | - Ansgar Kahmen
- Department of Environmental Sciences, University of Basel, Schönbeinstrasse 6, 4056, Basel, Switzerland
| | - Günter Hoch
- Department of Environmental Sciences, University of Basel, Schönbeinstrasse 6, 4056, Basel, Switzerland
| | - Christian Körner
- Department of Environmental Sciences, University of Basel, Schönbeinstrasse 6, 4056, Basel, Switzerland
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2
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Schwarzer NH, Dietrich L, Gingelmaier S, Nolte T, Bolz T, Fonagy P. Mentalizing partially mediates the association between attachment insecurity and global stress in preservice teachers. Front Psychol 2023; 14:1204666. [PMID: 37671112 PMCID: PMC10475550 DOI: 10.3389/fpsyg.2023.1204666] [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: 04/13/2023] [Accepted: 07/27/2023] [Indexed: 09/07/2023] Open
Abstract
Objective Considering the fact that the teaching profession is a highly stressful occupation and that teachers' ineffective coping strategies contribute to higher levels of stress, the objective of the present study was to investigate whether insecure attachment is related to global stress experiences in preservice student teachers. Furthermore, it was examined whether this link is mediated by the preservice teachers' mentalizing-the capacity to perceive and consider one's own and others' behavior based on intentional mental states. Methods Data of this cross-sectional study came from 202 preservice student teachers using self-report instruments (attachment: Expectation in Close Relationships; mentalizing: Reflective Functioning Questionnaire; stress: Trier Inventory of Chronic Stress). The hypotheses were tested using structural equation modelling. Results Anxious attachment was positively related to stress and impairments in mentalizing. In addition, the link between attachment-related anxiety and stress was partially mediated by mentalizing. Avoidant attachment was not associated with stress or mentalizing. Discussion Results indicate that anxious attachment is associated with higher perceived stress in preservice student teachers. Consequently, attachment-related anxiety may be a risk factor which, in turn, may foster perceptions of higher global stress experiences. Conclusion Additional research needs to focus on exploring the link between attachment insecurity and global stress experiences among preservice student teachers. An examination of preservice student teachers' own attachment experiences proves to be useful, for example in the context of mentalization-based supervision or reflective practice.
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Affiliation(s)
| | - Lars Dietrich
- Humboldt University of Berlin, Berlin, Baden-Wurttemberg, Germany
| | | | - Tobias Nolte
- Anna Freud National Centre for Children and Families, London, United Kingdom
| | - Tijs Bolz
- University of Oldenburg, Oldenburg, Lower Saxony, Germany
| | - Peter Fonagy
- University College London, London, England, United Kingdom
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3
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Peters RL, Steppe K, Pappas C, Zweifel R, Babst F, Dietrich L, von Arx G, Poyatos R, Fonti M, Fonti P, Grossiord C, Gharun M, Buchmann N, Steger DN, Kahmen A. Daytime stomatal regulation in mature temperate trees prioritizes stem rehydration at night. New Phytol 2023. [PMID: 37235688 DOI: 10.1111/nph.18964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 04/16/2023] [Indexed: 05/28/2023]
Abstract
Trees remain sufficiently hydrated during drought by closing stomata and reducing canopy conductance (Gc ) in response to variations in atmospheric water demand and soil water availability. Thresholds that control the reduction of Gc are proposed to optimize hydraulic safety against carbon assimilation efficiency. However, the link between Gc and the ability of stem tissues to rehydrate at night remains unclear. We investigated whether species-specific Gc responses aim to prevent branch embolisms, or enable night-time stem rehydration, which is critical for turgor-dependent growth. For this, we used a unique combination of concurrent dendrometer, sap flow and leaf water potential measurements and collected branch-vulnerability curves of six common European tree species. Species-specific Gc reduction was weakly related to the water potentials at which 50% of branch xylem conductivity is lost (P50 ). Instead, we found a stronger relationship with stem rehydration. Species with a stronger Gc control were less effective at refilling stem-water storage as the soil dries, which appeared related to their xylem architecture. Our findings highlight the importance of stem rehydration for water-use regulation in mature trees, which likely relates to the maintenance of adequate stem turgor. We thus conclude that stem rehydration must complement the widely accepted safety-efficiency stomatal control paradigm.
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Affiliation(s)
- Richard L Peters
- Laboratory of Plant Ecology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
- Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
- Forest is Life, TERRA Teaching and Research Centre, Gembloux Agro Bio-Tech, University of Liège, Passage des Déportés 2, 5030, Gembloux, Belgium
| | - Kathy Steppe
- Laboratory of Plant Ecology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
| | - Christoforos Pappas
- Department of Civil Engineering, University of Patras, Rio, Patras, 26504, Greece
| | - Roman Zweifel
- Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
| | - Flurin Babst
- School of Natural Resources and the Environment, University of Arizona, East Lowell Street 1064, Tucson, AZ, 85721, USA
- Laboratory of Tree-Ring Research, University of Arizona, East Lowell Street 1215, Tucson, AZ, 857121, USA
| | - Lars Dietrich
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Georg von Arx
- Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
- Oeschger Centre for Climate Change Research, University of Bern, 3012, Bern, Switzerland
| | - Rafael Poyatos
- CREAF, E08193 Bellaterra (Cerdanyola del Vallès), Catalonia, Spain
- Universitat Autònoma de Barcelona, E08193 Bellaterra (Cerdanyola del Vallès), Catalonia, Spain
| | - Marina Fonti
- Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
| | - Patrick Fonti
- Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
| | - Charlotte Grossiord
- Plant Ecology Research Laboratory PERL, School for Architecture, Civil and Environmental Engineering, EPFL, CH-1015, Lausanna, Switzerland
- Community Ecology Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, CH-1015, Lausanne, Switzerland
| | - Mana Gharun
- Department of Environmental Systems Science, ETH Zurich, Universitatstrasse 2, CH-8092, Zurich, Switzerland
- Department of Geosciences, University of Münster, Heisenbergstrasse 2, 48149, Münster, Germany
| | - Nina Buchmann
- Department of Environmental Systems Science, ETH Zurich, Universitatstrasse 2, CH-8092, Zurich, Switzerland
| | - David N Steger
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Ansgar Kahmen
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
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4
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Sander AK, Dietrich L, Kloss-Brandstätter A, Krause M, Zimmerer R, Neuhaus M, Bartella AK, Lethaus B. The Cleft-screen-questionnaire (CSQ) - A validated screening instrument for health-related quality of life in cleft patients. J Plast Reconstr Aesthet Surg 2022; 75:3429-3435. [PMID: 35610102 DOI: 10.1016/j.bjps.2022.04.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 02/01/2022] [Accepted: 04/12/2022] [Indexed: 11/18/2022]
Abstract
BACKGROUND The objective of this study is to develop and validate a specific screening instrument for assessing the quality of life (QoL) of patients with orofacial clefts. The Cleft-Screen-Questionnaire (CSQ) aims at identifying the main problematic areas and is intended for the routine use in everyday clinical practice to constantly evaluate the conditions' and treatments' effects on patients' well-being. METHODS First, a pool of 58 questions is created by collecting items from validated questionnaires previously used for assessing the QoL in cleft populations. After the removal of duplicate questions, the questionnaires are answered by 152 patients from a tertiary care center. A factor analysis followed by the calculation of Cronbach's alpha as a reliability measurement led to the final CSQ presented here. RESULTS The applied factor analysis resulted in five factors. Items showing low factor loadings (seen as <0.5) were excluded initially. Accordingly, factor analysis led to a preliminary number of 43 items. A reliability analysis using Cronbach's alpha and corrected alpha if item deleted showed an overall moderate to high reliability (seen as: 0.6-0.9). After excluding questions with increasing alphas if item deleted, analyses yielded in a final number of 38 questions. CONCLUSION The final 38-item CSQ is a reliable instrument for evaluating the health-related QoL of cleft patients.
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Affiliation(s)
- A K Sander
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany.
| | - L Dietrich
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany
| | - A Kloss-Brandstätter
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany
| | - M Krause
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany
| | - R Zimmerer
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany
| | - M Neuhaus
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany
| | - A K Bartella
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany
| | - B Lethaus
- Department of Oral- and Maxillofacial Surgery, University Hospital Leipzig, Liebigstr. 12, 04103 Leipzig, Germany
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5
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Dietrich L. Higher expectations of teachers are not sufficient: How to take the next big step in social‐emotional teacher training. Int J Appl Psychoanal Studies 2021. [DOI: 10.1002/aps.1724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lars Dietrich
- Department of Rehabilitation Sciences Division of Pedagogy for Psychosocial Difficulties Humboldt‐Universität zu Berlin Berlin Germany
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6
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Friebe-Hoffmann U, Dietrich L, Hönig K, Friedl T, Paulus W. Emotionale Auswirkung des DEGUM II basierten Zweittrimester-Screenings auf werdende Väter. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1717918] [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: 10/23/2022] Open
Affiliation(s)
| | | | - K Hönig
- Universitätsklinik Ulm, Klinik für Psychosomatische Medizin und Psychotherapie
| | | | - W Paulus
- Universitätsklinik Ulm, Frauenheilkunde
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7
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Ripani P, Delp J, Bode K, Delgado ME, Dietrich L, Betzler VM, Yan N, von Scheven G, Mayer TU, Leist M, Brunner T. Thiazolides promote G1 cell cycle arrest in colorectal cancer cells by targeting the mitochondrial respiratory chain. Oncogene 2019; 39:2345-2357. [PMID: 31844249 DOI: 10.1038/s41388-019-1142-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 11/26/2019] [Accepted: 11/29/2019] [Indexed: 01/10/2023]
Abstract
Systemic toxicity and tumor cell resistance still limit the efficacy of chemotherapy in colorectal cancer. Therefore, alternative treatments are desperately needed. The thiazolide Nitazoxanide (NTZ) is an FDA-approved drug for the treatment of parasite-mediated infectious diarrhea with a favorable safety profile. Interestingly, NTZ and the thiazolide RM4819-its bromo-derivative lacking antibiotic activity-are also promising candidates for cancer treatment. Yet the exact anticancer mechanism(s) of these compounds still remains unclear. In this study, we systematically investigated RM4819 and NTZ in 2D and 3D colorectal cancer culture systems. Both compounds strongly inhibited proliferation of colon carcinoma cell lines by promoting G1 phase cell cycle arrest. Thiazolide-induced cell cycle arrest was independent of the p53/p21 axis, but was mediated by inhibition of protein translation via the mTOR/c-Myc/p27 pathway, likely caused by inhibition of mitochondrial respiration. While both thiazolides demonstrated mitochondrial uncoupling activity, only RM4819 inhibited the mitochondrial respiratory chain complex III. Interestingly, thiazolides also potently inhibited the growth of murine colonic tumoroids in a comparable manner with cisplatin, while in contrast to cisplatin thiazolides did not affect the growth of primary intestinal organoids. Thus, thiazolides appear to have a tumor-selective antiproliferative activity, which offers new perspectives in the treatment of colorectal cancer.
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Affiliation(s)
- P Ripani
- Department of Biology, Biochemical Pharmacology, University of Konstanz, Konstanz, Germany.,Konstanz Research School Chemical Biology KORS-CB, University of Konstanz, Konstanz, Germany
| | - J Delp
- Konstanz Research School Chemical Biology KORS-CB, University of Konstanz, Konstanz, Germany.,Chair for In Vitro Toxicology and Biomedicine, inaugurated by the Doerenkamp-Zbinden Foundation, University of Konstanz, Konstanz, Germany
| | - K Bode
- Department of Biology, Biochemical Pharmacology, University of Konstanz, Konstanz, Germany
| | - M E Delgado
- Department of Biology, Biochemical Pharmacology, University of Konstanz, Konstanz, Germany
| | - L Dietrich
- Department of Biology, Biochemical Pharmacology, University of Konstanz, Konstanz, Germany
| | - V M Betzler
- Department of Biology, Biochemical Pharmacology, University of Konstanz, Konstanz, Germany.,Biotechnology Institute Thurgau, University of Konstanz, Konstanz, Germany
| | - N Yan
- Department of Medicinal Chemistry, Peking University Health Science Centre, Beijing, China
| | - G von Scheven
- Department of Biology, Molecular Toxicology Group, University of Konstanz, Konstanz, Germany
| | - T U Mayer
- Konstanz Research School Chemical Biology KORS-CB, University of Konstanz, Konstanz, Germany.,Department of Biology, Molecular Genetics, University of Konstanz, Konstanz, Germany
| | - M Leist
- Konstanz Research School Chemical Biology KORS-CB, University of Konstanz, Konstanz, Germany.,Chair for In Vitro Toxicology and Biomedicine, inaugurated by the Doerenkamp-Zbinden Foundation, University of Konstanz, Konstanz, Germany
| | - T Brunner
- Department of Biology, Biochemical Pharmacology, University of Konstanz, Konstanz, Germany. .,Konstanz Research School Chemical Biology KORS-CB, University of Konstanz, Konstanz, Germany.
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8
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Affiliation(s)
- Lars Dietrich
- Department for Rehabilitation Sciences, Division of Psychosocial Difficulties, Humboldt-Universität zu Berlin , Berlin, Germany
| | - Ronald F. Ferguson
- Malcom Wiener Center for Social Policy, Harvard University, John F. Kennedy School of Government , Cambridge, MA, USA
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9
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Affiliation(s)
- Lars Dietrich
- Humboldt-Universität zu Berlin , Department for Rehabilitation Sciences, Division of Psychosocial Difficulties, Berlin, Germany
| | - Josef Hofman
- Humboldt-Universität zu Berlin , Department for Rehabilitation Sciences, Division of Psychosocial Difficulties, Berlin, Germany
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10
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Affiliation(s)
- Lars Dietrich
- Department of Rehabilitation Sciences, Humboldt-Universität zu Berlin, Berlin, Germany
| | - David Zimmermann
- Department of Rehabilitation Sciences, Humboldt-Universität zu Berlin, Berlin, Germany
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11
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Salmon Y, Dietrich L, Sevanto S, Hölttä T, Dannoura M, Epron D. Drought impacts on tree phloem: from cell-level responses to ecological significance. Tree Physiol 2019; 39:173-191. [PMID: 30726983 DOI: 10.1093/treephys/tpy153] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 12/03/2018] [Accepted: 01/25/2019] [Indexed: 06/09/2023]
Abstract
On-going climate change is increasing the risk of drought stress across large areas worldwide. Such drought events decrease ecosystem productivity and have been increasingly linked to tree mortality. Understanding how trees respond to water shortage is key to predicting the future of ecosystem functions. Phloem is at the core of the tree functions, moving resources such as non-structural carbohydrates, nutrients, and defence and information molecules across the whole plant. Phloem function and ability to transport resources is tightly controlled by the balance of carbon and water fluxes within the tree. As such, drought is expected to impact phloem function by decreasing the amount of available water and new photoassimilates. Yet, the effect of drought on the phloem has received surprisingly little attention in the last decades. Here we review existing knowledge on drought impacts on phloem transport from loading and unloading processes at cellular level to possible effects on long-distance transport and consequences to ecosystems via ecophysiological feedbacks. We also point to new research frontiers that need to be explored to improve our understanding of phloem function under drought. In particular, we show how phloem transport is affected differently by increasing drought intensity, from no response to a slowdown, and explore how severe drought might actually disrupt the phloem transport enough to threaten tree survival. Because transport of resources affects other organisms interacting with the tree, we also review the ecological consequences of phloem response to drought and especially predatory, mutualistic and competitive relations. Finally, as phloem is the main path for carbon from sources to sink, we show how drought can affect biogeochemical cycles through changes in phloem transport. Overall, existing knowledge is consistent with the hypotheses that phloem response to drought matters for understanding tree and ecosystem function. However, future research on a large range of species and ecosystems is urgently needed to gain a comprehensive understanding of the question.
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Affiliation(s)
- Yann Salmon
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, Gustaf Hällströmin katu 2b, University of Helsinki, Helsinki, Finland
- Institute for Atmospheric and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, Latokartanonkaari 7, University of Helsinki, Helsinki, Finland
| | - Lars Dietrich
- Department of Environmental Sciences, University of Basel, Schönbeinstrasse 6, Basel, Switzerland
| | - Sanna Sevanto
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, PO Box 1663 MA 495, Los Alamos, NM, USA
| | - Teemu Hölttä
- Institute for Atmospheric and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, Latokartanonkaari 7, University of Helsinki, Helsinki, Finland
| | - Masako Dannoura
- Kyoto University, Laboratory of Ecosystem Production and Dynamics, Graduate School of Global Environmental Studies, Kyoto, Japan
- Kyoto University, Laboratory of Forest Utilization, Graduate School of Agriculture, Kyoto, Japan
| | - Daniel Epron
- Université de Lorraine, AgroParisTech, INRA, UMR Silva, Faculté des Sciences et Technologies, Nancy, France
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12
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Abstract
The water status of transpiring tree crowns depends on a hydraulic continuum from the soil matrix around roots to the sub-stomatal cavity of leaves, with a multitude of hydraulic resistances along this path. Although the stem xylem path may not be the most critical of these resistances, it had been suggested that a >50% interruption of that path by drought-stress-induced embolization (air filling) of conduits is critical for tree survival. Here we show that cutting the sapwood of mature, 35 m tall trees in half hardly affects crown water status and transpiration. Counter expectation, this first adult tree sapwood interception experiment revealed that shoot water potential in the canopy (assessed by using a 45 m canopy crane) either remained unaffected (spruce) or became less negative (beech), associated with small reductions in leaf diffusive conductance for water vapour. We conclude that the stem xylem of these trees has a large overcapacity and the tree hydraulics debate requires a critical re-visitation.
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Affiliation(s)
- Lars Dietrich
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland.
| | - Günter Hoch
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Ansgar Kahmen
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Christian Körner
- Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
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13
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Peters RL, Fonti P, Frank DC, Poyatos R, Pappas C, Kahmen A, Carraro V, Prendin AL, Schneider L, Baltzer JL, Baron-Gafford GA, Dietrich L, Heinrich I, Minor RL, Sonnentag O, Matheny AM, Wightman MG, Steppe K. Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method. New Phytol 2018; 219:1283-1299. [PMID: 29862531 DOI: 10.1111/nph.15241] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 04/24/2018] [Indexed: 06/08/2023]
Abstract
Trees play a key role in the global hydrological cycle and measurements performed with the thermal dissipation method (TDM) have been crucial in providing whole-tree water-use estimates. Yet, different data processing to calculate whole-tree water use encapsulates uncertainties that have not been systematically assessed. We quantified uncertainties in conifer sap flux density (Fd ) and stand water use caused by commonly applied methods for deriving zero-flow conditions, dampening and sensor calibration. Their contribution has been assessed using a stem segment calibration experiment and 4 yr of TDM measurements in Picea abies and Larix decidua growing in contrasting environments. Uncertainties were then projected on TDM data from different conifers across the northern hemisphere. Commonly applied methods mostly underestimated absolute Fd . Lacking a site- and species-specific calibrations reduced our stand water-use measurements by 37% and induced uncertainty in northern hemisphere Fd . Additionally, although the interdaily variability was maintained, disregarding dampening and/or applying zero-flow conditions that ignored night-time water use reduced the correlation between environment and Fd . The presented ensemble of calibration curves and proposed dampening correction, together with the systematic quantification of data-processing uncertainties, provide crucial steps in improving whole-tree water-use estimates across spatial and temporal scales.
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Affiliation(s)
- Richard L Peters
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
- Department of Environmental Sciences - Botany, Basel University, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Patrick Fonti
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
| | - David C Frank
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
- Laboratory of Tree-Ring Research, 1215 E. Lowell Street, Tucson, AZ, 8572, USA
- Oeschger Centre for Climate Change Research, Falkenplatz 16, CH-3012, Bern, Switzerland
| | - Rafael Poyatos
- CREAF, E08193, Bellaterra (Cerdanyola del Vallès), Catalonia, Spain
- Faculty of Bioscience Engineering, Department of Plants and Crops, Laboratory of Plant Ecology, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
| | - Christoforos Pappas
- Département de géographie and Centre d'études nordiques, Université de Montréal, Montréal, QC, H2V 2B8, Canada
| | - Ansgar Kahmen
- Department of Environmental Sciences - Botany, Basel University, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Vinicio Carraro
- Department TeSAF Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell'Università 16, I-35020, Legnaro, PD, Italy
| | - Angela Luisa Prendin
- Department TeSAF Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell'Università 16, I-35020, Legnaro, PD, Italy
- Department of Bioscience, Ecoinformatic & Biodiversity, Aarhus University, Ny Munkegade 116, Building 1540, DK-8000, Aarhus C, Denmark
| | - Loïc Schneider
- Landscape Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
| | - Jennifer L Baltzer
- Biology Department, Wilfrid Laurier University, 75 University Ave. W, Waterloo, ON, N2L 3C5, Canada
| | - Greg A Baron-Gafford
- School of Geography and Development, University of Arizona, 1064 E Lowell St, Tucson, AZ, 85719, USA
| | - Lars Dietrich
- Department of Environmental Sciences - Botany, Basel University, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
| | - Ingo Heinrich
- Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Climate Dynamics and Landscape Evolution, Telegrafenberg, 14473, Potsdam, Germany
| | - Rebecca L Minor
- School of Geography and Development, University of Arizona, 1064 E Lowell St, Tucson, AZ, 85719, USA
| | - Oliver Sonnentag
- Département de géographie and Centre d'études nordiques, Université de Montréal, Montréal, QC, H2V 2B8, Canada
| | - Ashley M Matheny
- Department of Geological Sciences, Jackson School of Geosciences, 2305 Speedway Stop, C1160, Austin, TX, USA
| | - Maxwell G Wightman
- College of Forestry, Oregon State University, 1500 SW Jefferson St, Corvallis, OR, 97331, USA
| | - Kathy Steppe
- Faculty of Bioscience Engineering, Department of Plants and Crops, Laboratory of Plant Ecology, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
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Dietrich L, Zweifel R, Kahmen A. Daily stem diameter variations can predict the canopy water status of mature temperate trees. Tree Physiol 2018; 38:941-952. [PMID: 29554370 DOI: 10.1093/treephys/tpy023] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 02/09/2018] [Indexed: 06/08/2023]
Abstract
Direct evidence for the link between stem diameter variations (SDV) and the daily canopy water status, i.e., daily water potentials (Ψ), is rare, particularly for tall trees. It thus remains unclear up to what degree SDV readings are useful to estimate daily canopy Ψ. We measured SDV with point dendrometers at the stem base of tall, mature individuals of six European forest tree species in a near-natural temperate forest and compared them with daily canopy Ψ during the growing seasons of 2014 (wet) and 2015 (dry). Stem diameter variations were de-trended for growth with two different approaches leading to the so-called tree water deficit (TWD). We found that midday Ψ can be predicted from TWD, independent of the growth-de-trending procedure to obtain TWD from SDV. Further, daily TWD was a better indicator for daily midday Ψ, particularly under dry conditions, than maximum daily shrinkage, another common quantity derived from SDV. Based on data from six temperate tree species, we conclude that TWD measured at the stem base is a consistent proxy for daily canopy midday Ψ of tall trees over the entire range of measured conditions.
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Affiliation(s)
- Lars Dietrich
- Department of Environmental Sciences - Botany, University of Basel, Schoenbeinstrasse 6, Basel, Switzerland
| | - Roman Zweifel
- Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, Birmensdorf, Switzerland
| | - Ansgar Kahmen
- Department of Environmental Sciences - Botany, University of Basel, Schoenbeinstrasse 6, Basel, Switzerland
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Held A, Glas A, Dietrich L, Bollmann M, Brandstädter K, Grossmann TN, Lohmann CH, Pap T, Bertrand J. Targeting β-catenin dependent Wnt signaling via peptidomimetic inhibitors in murine chondrocytes and OA cartilage. Osteoarthritis Cartilage 2018; 26:818-823. [PMID: 29559252 DOI: 10.1016/j.joca.2018.02.908] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 02/21/2018] [Accepted: 02/27/2018] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The canonical Wnt signaling pathway has been shown to be involved in regulating chondrocyte hypertrophic differentiation during Osteoarthritis (OA). The aim of this study was to test the therapeutic potential of two stapled peptide canonical Wnt inhibitors - SAH-Bcl9 and StAx-35R - in preventing Wnt induced cartilage changes in OA. METHODS Primary neonatal murine chondrocytes and cartilage explants from OA patients undergoing total joint replacement for knee OA, were used for microscopy to determine matrix and cell penetrating capacity of fluorescein isothiocyanate FITC-tagged SAH-Bcl9 and StAx-35R peptides. T cell factor/lymphoid enhancer-binding factor (TCF/LEF) reporter assays were used to monitor the inhibition of Wnt3a induced β-catenin signaling by each peptide. Changes in chondrocyte phenotypic marker gene expression were analyzed by qRT PCR. RESULTS Both peptides localized intercellular in primary murine chondrocytes and cartilage explants. They inhibited Wnt3a induced TCF/LEF promoter activity in primary murine chondrocytes. Both inhibitors did not rescue Wnt3a altered expression of chondrocyte phenotypic genes (Sox9, Col2a1, Acan) and hypertrophy marker gene (Col10a1) at high doses (100 ng/ml). Upon application of 10 ng/ml Wnt3a, StAx-35R partially reversed the Wnt effect on Sox9 and Col2a1 gene expression. Both peptides, however, reversed the downregulation of SOX9 and aggrecan (ACAN), and decrease of COL10A1 gene expression in preserved human OA cartilage explants. CONCLUSION These data indicate that blockade of canonical Wnt signaling might be a therapeutic strategy to treat early OA cases and protect further cartilage degradation by preventing chondrocyte hypertrophic differentiation.
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Affiliation(s)
- A Held
- Department of Orthopaedic Surgery, Otto-von-Guericke University, Magdeburg, Germany
| | - A Glas
- Chemical Genomics Centre of the Max-Planck Society, Dortmund, Germany
| | - L Dietrich
- Chemical Genomics Centre of the Max-Planck Society, Dortmund, Germany
| | - M Bollmann
- Department of Orthopaedic Surgery, Otto-von-Guericke University, Magdeburg, Germany
| | - K Brandstädter
- Institute of Forensic Medicine, University Hospital Halle, Remote Office Magdeburg, Halle (Saale), Magdeburg, Germany
| | - T N Grossmann
- Chemical Genomics Centre of the Max-Planck Society, Dortmund, Germany; Department of Chemistry and Pharmaceutical Science, VU University Amsterdam, Amsterdam, The Netherlands
| | - C H Lohmann
- Department of Orthopaedic Surgery, Otto-von-Guericke University, Magdeburg, Germany
| | - T Pap
- Institute of Experimental Musculoskeletal Medicine, University Hospital Münster, Münster, Germany
| | - J Bertrand
- Department of Orthopaedic Surgery, Otto-von-Guericke University, Magdeburg, Germany.
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Wisinski KB, Burkard ME, Njiaju U, Donohue S, Hegeman R, Stella A, Mansky P, Shah V, Goggins T, Qamar R, Dietrich L, Kim K, Traynor A, Tevaarwerk A. Abstract P3-12-10: Feasibility of four cycles of docetaxel and cyclophosphamide every 14 days as an adjuvant regimen for breast cancer: A Wisconsin oncology network study. Cancer Res 2013. [DOI: 10.1158/0008-5472.sabcs13-p3-12-10] [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: 11/16/2022]
Abstract
Abstract
Background: Dose-dense therapies have had a major impact on reducing toxicity and improving outcomes in breast cancer. A combination of docetaxel plus cyclophosphamide (TC) every 3 weeks has emerged as a common chemotherapy regimen used for treatment of node-negative or lower-risk node-positive breast cancer. We tested whether it is feasible to deliver TC on a dose-dense schedule.
Patients and Methods: We enrolled women with early stage breast cancer on a single-arm phase II study of adjuvant dose-dense TC (ddTC) through a regional oncology network (WON). All women completed primary surgery; subsequent therapy with TC was deemed appropriate by the treating physician. Planned treatment was docetaxel 75 mg/m2 plus cyclophosphamide 600 mg/m2 every 2 weeks for 4 cycles with subcutaneous pegfilgrastim 6 mg administered 24-48 hours after the administration of each chemotherapy cycle. The primary endpoint was feasibility of administering therapy within 10 weeks. A Simon Optimal 2-Stage design was employed for the study design.
Results: Of 42 women enrolled, 41 were evaluable by prespecified criteria. Median age was 54 (28-73). Most subjects had node negative (73%) or hormone receptor positive (71%) tumors. Of the 41 subjects, 37 (90.2%) completed therapy within 10 weeks and 34 (83%) completed therapy at 8 weeks without dose modification. Rates of grade 2 neuropathy were similar to that reported previously (15%) and there were no cases of grade 3 or higher neuropathy. The rate of neutropenic fever was low (2.5%). Rash and plantar/palmar erythrodythesia were common and reached grade 3 in four subjects (9.8%).
Conclusion: Dose-dense TC is feasible with tolerability profiles similar to standard TC and a low likelihood of neutropenic fever. This study supports further clinical development of this 8-week adjuvant chemotherapy regimen.
Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P3-12-10.
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Affiliation(s)
- KB Wisinski
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - ME Burkard
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - U Njiaju
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - S Donohue
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - R Hegeman
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - A Stella
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - P Mansky
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - V Shah
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - T Goggins
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - R Qamar
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - L Dietrich
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - K Kim
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - A Traynor
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
| | - A Tevaarwerk
- University of Wisconsin Carbone Cancer Center, Madison, WI; Bellin Memorial Hospital, Green Bay, WI; Columbia St. Mary's, Milwaukee, WI; Fox Valley Hematology and Oncology, Appleton, WI; Aurora Cancer Care, Wauwatosa, WI; Gunderson Lutheran Health System, Lacrosse, WI
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Dietrich L. 30 Psychosocial Cancer Rehabilitation. Eur J Oncol Nurs 2012. [DOI: 10.1016/s1462-3889(12)70045-5] [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: 10/28/2022]
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Frisby K, Meyer L, Lee J, Mathiason M, Dietrich L. Evaluation of quality indicators (QIs) for colorectal cancer care in a community setting. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.6585] [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: 11/20/2022] Open
Abstract
6585 Background: We compared two existing sets of QIs for colorectal cancer care to evaluate our performance as compared to published data. We also explored reasons for non-adherence to these QIs to determine how we could increase our compliance. Methods: Chart review of all patients who were newly diagnosed with colorectal cancer at our institution in 2004 and 2005 for compliance with QIs for colorectal cancer care as presented by National Initiative for Cancer Care Quality (NICCQ) and Moffitt Network Initiative on Practice Quality (MNIPQ). When 85% compliance was not observed, charts were reviewed as to why care differed from QI. Results: Adherence rate was less than 85% in 5 of 25 NICCQ colon cancer measures and patients overall received 83% of recommended care. Reasons for <85% adherence on NICCQ were most often due to patient decision (patient decision after informed discussion, refusal of treatment, patient initiated delay) or co-morbidity (poor wound healing, infection, medical co-morbidity). In one item regarding counseling of family members about colorectal screening we were truly noncompliant without documentation of reason. Review of MNIPQ items observed less than 85% adherence rate in 2 of 9. Reason for non-adherence in MNIPQ review was due most often to co- morbidity, and true noncompliance (no reason documented for lack of pretreatment CEA). Conclusions: Our adherence rates for NICCQ and MNIPQ measures compare favorably with published values. Lower compliance rates on NICCQ and MNIPQ measures were most often due to patient choice or co-morbidities. In setting benchmarks for these individual QIs it should be noted that for some indicators (such as those regarding adjuvant therapy) higher percent adherence does not always reflect better care. Higher compliance may actually mean that thoughtful consideration of patient co-morbidity and complications, or including patients in decision making is not occurring or that the population being served is younger or has fewer co-morbidities. Other indicators such as those regarding staging documentation, documentation of chemotherapy, and patient education factors the higher the compliance the better. We conclude that some sampling of reason for non- adherence is necessary when assessing quality of care. No significant financial relationships to disclose.
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Affiliation(s)
- K. Frisby
- Gundersen Lutheran Medical Center, La Crosse, WI
| | - L. Meyer
- Gundersen Lutheran Medical Center, La Crosse, WI
| | - J. Lee
- Gundersen Lutheran Medical Center, La Crosse, WI
| | - M. Mathiason
- Gundersen Lutheran Medical Center, La Crosse, WI
| | - L. Dietrich
- Gundersen Lutheran Medical Center, La Crosse, WI
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Abstract
A new online imaging approach, linac-integrated cone beam CT (CBCT), has been developed over the past few years. It has the advantage that a patient can be examined in their treatment position directly before or during a radiotherapy treatment. Unfortunately, respiratory organ motion, one of the largest intrafractional organ motions, often leads to artefacts in the reconstructed 3D images. One way to take this into account is to register the breathing phase during image acquisition for a phase-correlated image reconstruction. Therefore, the main focus of this work is to present a system which has the potential to investigate the correlation between internal (movement of the diaphragm) and external (data of a respiratory gating system) information about breathing phase and amplitude using an inline CBCT scanner. This also includes a feasibility study about using the acquired information for a respiratory-correlated 4D CBCT reconstruction. First, a moving lung phantom was used to develop and to specify the required methods which are based on an image reconstruction using only projections belonging to a certain moving phase. For that purpose, the corresponding phase has to be detected for each projection. In the case of the phantom, an electrical signal allows one to track the movement in real time. The number of projections available for the image reconstruction depends on the breathing phase and the size of the position range from which projections should be used for the reconstruction. The narrower this range is, the better the inner structures can be located, but also the noise of the images increases due to the limited number of projections. This correlation has also been analysed. In a second step, the methods were clinically applied using data sets of patients with lung tumours. In this case, the breathing phase was detected by an external gating system (AZ-733V, Anzai Medical Co.) based on a pressure sensor attached to the patient's abdominal region with a fixation belt. The comparison of the reconstructed 4D CBCT images and the corresponding 4D CT images used for the treatment planning provides the required information for the calculation of possible setup errors. So, a repositioning of the patient is feasible even though the patient moves due to respiration. In addition to the external signal, the position of the diaphragm in the cranial-caudal direction could be extracted from each projection. Both independent sources of information show a very good agreement of the phase and even the amplitude of the movement and the external signal respectively. This suggests the usability of such a system for a gated dose delivery approach. However, more studies involving patients with different incidences have to be carried out to confirm these first results.
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Affiliation(s)
- Lars Dietrich
- Department of Medical Physics, German Cancer Research Center, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.
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Thilmann C, Nill S, Tücking T, Höss A, Hesse B, Dietrich L, Bendl R, Rhein B, Häring P, Thieke C, Oelfke U, Debus J, Huber P. Correction of patient positioning errors based on in-line cone beam CTs: clinical implementation and first experiences. Radiat Oncol 2006; 1:16. [PMID: 16723023 PMCID: PMC1557518 DOI: 10.1186/1748-717x-1-16] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [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: 11/07/2005] [Accepted: 05/24/2006] [Indexed: 11/22/2022] Open
Abstract
Background The purpose of the study was the clinical implementation of a kV cone beam CT (CBCT) for setup correction in radiotherapy. Patients and methods For evaluation of the setup correction workflow, six tumor patients (lung cancer, sacral chordoma, head-and-neck and paraspinal tumor, and two prostate cancer patients) were selected. All patients were treated with fractionated stereotactic radiotherapy, five of them with intensity modulated radiotherapy (IMRT). For patient fixation, a scotch cast body frame or a vacuum pillow, each in combination with a scotch cast head mask, were used. The imaging equipment, consisting of an x-ray tube and a flat panel imager (FPI), was attached to a Siemens linear accelerator according to the in-line approach, i.e. with the imaging beam mounted opposite to the treatment beam sharing the same isocenter. For dose delivery, the treatment beam has to traverse the FPI which is mounted in the accessory tray below the multi-leaf collimator. For each patient, a predefined number of imaging projections over a range of at least 200 degrees were acquired. The fast reconstruction of the 3D-CBCT dataset was done with an implementation of the Feldkamp-David-Kress (FDK) algorithm. For the registration of the treatment planning CT with the acquired CBCT, an automatic mutual information matcher and manual matching was used. Results and discussion Bony landmarks were easily detected and the table shifts for correction of setup deviations could be automatically calculated in all cases. The image quality was sufficient for a visual comparison of the desired target point with the isocenter visible on the CBCT. Soft tissue contrast was problematic for the prostate of an obese patient, but good in the lung tumor case. The detected maximum setup deviation was 3 mm for patients fixated with the body frame, and 6 mm for patients positioned in the vacuum pillow. Using an action level of 2 mm translational error, a target point correction was carried out in 4 cases. The additional workload of the described workflow compared to a normal treatment fraction led to an extra time of about 10–12 minutes, which can be further reduced by streamlining the different steps. Conclusion The cone beam CT attached to a LINAC allows the acquisition of a CT scan of the patient in treatment position directly before treatment. Its image quality is sufficient for determining target point correction vectors. With the presented workflow, a target point correction within a clinically reasonable time frame is possible. This increases the treatment precision, and potentially the complex patient fixation techniques will become dispensable.
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Affiliation(s)
- Christoph Thilmann
- Dept. of Radiooncology, German Cancer Research Center, Heidelberg, Germany
- Clinical Radiology, University of Heidelberg, Heidelberg, Germany
| | - Simeon Nill
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Thomas Tücking
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Angelika Höss
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Bernd Hesse
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Lars Dietrich
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Rolf Bendl
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Bernhard Rhein
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Peter Häring
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Christian Thieke
- Dept. of Radiooncology, German Cancer Research Center, Heidelberg, Germany
- Clinical Radiology, University of Heidelberg, Heidelberg, Germany
| | - Uwe Oelfke
- Dept. of Medical Physics, German Cancer Research Center, Heidelberg, Germany
| | - Juergen Debus
- Clinical Radiology, University of Heidelberg, Heidelberg, Germany
| | - Peter Huber
- Dept. of Radiooncology, German Cancer Research Center, Heidelberg, Germany
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Adamová D, Agakichiev G, Antończyk D, Appelshäuser H, Belaga V, Bielcíková J, Braun-Munzinger P, Busch O, Cherlin A, Damjanovic S, Dietel T, Dietrich L, Drees A, Esumi SI, Filimonov K, Fomenko K, Fraenkel Z, Garabatos C, Glässel P, Hering G, Holeczek J, Krobath G, Kushpil V, Ludolphs W, Maas A, Marín A, Milosević J, Miśkowiec D, Ortega R, Panebrattsev Y, Petchenova O, Petrácek V, Radomski S, Rak J, Ravinovich I, Rehak P, Sako H, Schmitz W, Schukraft J, Sedykh S, Shimansky S, Stachel J, Sumbera M, Tilsner H, Tserruya I, Tsiledakis G, Wessels JP, Wienold T, Wurm JP, Yurevich S, Yurevich V. Leptonic and charged kaon decay modes of the phi meson measured in heavy-ion collisions at the CERN super proton synchrotron. Phys Rev Lett 2006; 96:152301. [PMID: 16712151 DOI: 10.1103/physrevlett.96.152301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2005] [Indexed: 05/09/2023]
Abstract
We report on results of a measurement of meson production in central Pb-Au collisions at E(lab) = 158A GeV. For the first time in the history of high energy heavy-ion collisions, phi mesons were reconstructed both in the K+K- and the dilepton decay channels in the same experiment. This measurement yields rapidity densities near midrapidity, from the two decay channels, of 2.05 +/- 0.14(stat) +/- 0.25(syst) and 2.04 +/- 0.49(stat) +/- 0.32(syst), respectively. The shape of the measured transverse momentum spectrum is also in close agreement in both decay channels. The data rule out a possible enhancement of the phi yield in the leptonic over the hadronic decay channel of a factor 1.6 or larger at the 95% C.L. This rules out the discrepancy reported in the literature between measurements of the hadronic and dimuon decay channels by two different experiments.
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Dietrich L, Tucking T, Nill S, Hesse B, Thilmann C, Huber P, Debus J, Oelfke U. Respiration Gated Cone Beam Imaging Reconstruction at a Dedicated Linear Accelerator. Int J Radiat Oncol Biol Phys 2005. [DOI: 10.1016/j.ijrobp.2005.07.865] [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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Abstract
One aim of adaptive radiotherapy (ART) is the observation of organ motion followed by a subsequent adaptation of the treatment plan. One way of achieving this goal is a kV x-ray source mounted at a linear accelerator in combination with a flat-panel imager. Two imaging hardware configurations were evaluated for their potential for online tracking and the subsequent correction of organ motion by using fluoroscopic images: x-ray tube positioned with (A) 90 degrees and (B) 180 degrees offset to the MV beam. For one lung case two IMRT plans with five coplanar beams and the table positioned at 0 degrees were optimized for two multileaf collimators (MLCs) with 10 mm and 2.75 mm leaf width. Respiratory motion, modelled by rigid transformation in the lungs, was investigated for different amplitudes. The 3D dose distributions for different cases (no movement, uncorrected movement, correction for the movement perpendicular to the respective kV beam) were evaluated with the help of dose volume histograms (DVHs) and a modified conformity (Baltas et al 1998 Int. J. Radiat. Oncol. Biol. Phys. 40 515-24) and coverage index using the 90% isodose. For the corrected treatment plans the influence of the observed displacement vector caused by organ movement was accounted for by a respective displacement of the target point. For the simulated movement with a small amplitude (3 mm) in the anterior-posterior (AP) direction the dose distributions resulting from the correction of the displacement vector using imaging system A or B showed similar results for both systems and were in good agreement with the dose distribution of the static (not moving) patient. Increasing the amplitude in the AP direction to 6 mm or even 9 mm leads for both amplitudes and both MLCs to almost the same conformity and coverage index as the static dose distribution if imaging system B is used for the online correction. For the dose distribution obtained with correction based on imaging system A the deviation between the optimal and the corrected dose distribution is increasing with increasing amplitude. For the MLC with the smaller leaf width the difference between the optimal and the corrected dose distributions is always significantly larger than for the less conformal dose distributions created by the MLC with the 10 mm leaves. These results can be explained by the fact that system A cannot observe movement in the AP-LR plane perpendicular to the MV beam and therefore cannot correct for these movements whereas system B only fails to observe the motion in the beam direction which for photon irradiation has less impact on the dose distribution.
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Affiliation(s)
- Simeon Nill
- Deutsches Krebsforschungszentrum (DKFZ), Department of Medical Physics, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.
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Nill S, Unkelbach J, Dietrich L, Oelfke U. SU-FF-J-61: Evaluation of Two Fluoroscopic Imaging Setups for Online Dose Delivery Adaptation. Med Phys 2005. [DOI: 10.1118/1.1997607] [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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Abstract
Respiratory organ motion is known to be one of the largest intrafractional organ motions. Therefore, it is important to investigate the potential benefit of gated dose delivery approaches which aim to account for the respective dose uncertainties. In this study respiration is simulated by a moving lung phantom; the movement is not restricted to a normal sinusoidal progression and simulates the one of the embedded lung tumour in the cranial-caudal direction. An IMRT plan with a total of 29 beam segments was designed for the treatment of this tumour. It was irradiated in its resting position-which is the position at exhalation-and during movement. Furthermore the irradiation was triggered using different amplitude thresholds, which means that the irradiation only proceeded if the deviation of the tumour's position from its resting position is smaller than the given threshold. We determined the gating-related increase of the treatment time for various gating procedures. We also measured the resulting dose distribution in specific slices of the phantom perpendicular to the direction of the movement using film dosimetry and compared it to the dose distribution of the static case. Since these film measurements cannot be done inside the whole tumour, additionally the movement and gating was simulated using the planning software to calculate the 3D dose distribution inside the tumour and to generate dose volume histograms for different treatment modalities. The total treatment time was observed to increase by 20%-100% depending on the individual gating threshold and can be calculated easily. The analysis of the films showed that irradiation without gating leads to significant underdosages up to 33%, especially at the edge of the tumour. With gating it is possible to considerably reduce this underdosage down to 9% depending on the trigger threshold. The calculation of the dose volume histograms makes it possible to find a reasonable compromise between the improvement of the dose distribution and the increase of the treatment time.
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Affiliation(s)
- Lars Dietrich
- Department of Medical Physics, German Cancer Research Center, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.
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Adamová D, Agakichiev G, Appelshäuser H, Belaga V, Braun-Munzinger P, Cherlin A, Damjanović S, Dietel T, Dietrich L, Drees A, Esumi SI, Filimonov K, Fomenko K, Fraenkel Z, Garabatos C, Glässel P, Hering G, Holeczek J, Kushpil V, Lenkeit B, Maas A, Marín A, Milosević J, Milov A, Miśkowiec D, Panebrattsev Y, Petchenova O, Petrácek V, Pfeiffer A, Rak J, Ravinovich I, Rehak P, Richter M, Sako H, Schmitz W, Sedykh S, Seipp W, Sharma A, Shimansky S, Slívová J, Specht HJ, Stachel J, Sumbera M, Tilsner H, Tserruya I, Wessels JP, Wienold T, Windelband B, Wurm JP, Xie W, Yurevich S, Yurevich V. Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS. Phys Rev Lett 2003; 91:042301. [PMID: 12906652 DOI: 10.1103/physrevlett.91.042301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2002] [Indexed: 05/24/2023]
Abstract
We report on first measurements of low-mass electron-positron pairs in Pb-Au collisions at the CERN SPS beam energy of 40 AGeV. The observed pair yield integrated over the range of invariant masses 0.2<m</=1 GeV/c(2) is enhanced over the expectation from neutral meson decays by a factor of 5.9+/-1.5(stat)+/-1.2(syst data)+/-1.8(syst meson decays), somewhat larger than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on pi(+)pi(-)-->e(+)e(-) annihilation with a modified rho propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature.
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Adamová D, Agakichiev G, Appelshäuser H, Belaga V, Braun-Munzinger P, Castillo A, Cherlin A, Damjanović S, Dietel T, Dietrich L, Drees A, Esumi SI, Filimonov K, Fomenko K, Fraenkel Z, Garabatos C, Glässel P, Hering G, Holeczek J, Kushpil V, Lenkeit B, Ludolphs W, Maas A, Marín A, Milosević J, Milov A, Miśkowiec D, Panebrattsev Y, Petchenova O, Petrácek V, Pfeiffer A, Rak J, Ravinovich I, Rehak P, Sako H, Schmitz W, Schukraft J, Sedykh S, Shimansky S, Slívová J, Specht HJ, Stachel J, Sumbera M, Tilsner H, Tserruya I, Wessels JP, Wienold T, Windelband B, Wurm JP, Xie W, Yurevich S, Yurevich V. Universal pion freeze-out in heavy-ion collisions. Phys Rev Lett 2003; 90:022301. [PMID: 12570540 DOI: 10.1103/physrevlett.90.022301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2002] [Indexed: 05/24/2023]
Abstract
Based on an evaluation of data on pion interferometry and on particle yields at midrapidity, we propose a universal condition for thermal freeze-out of pions in heavy-ion collisions. We show that freeze-out occurs when the mean free path of pions lambda(f) reaches a value of about 1 fm, which is much smaller than the spatial extent of the system at freeze-out. This critical mean free path is independent of the centrality of the collision and beam energy from the Alternating Gradient Synchrotron to the Relativistic Heavy Ion Collider.
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Affiliation(s)
- D Adamová
- Nuclear Physics Institute ASCR, 25068 Rez, Czech Republic
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Rohde J, Dietrich L, Langosch D, Ungermann C. The transmembrane domain of Vam3 affects the composition of cis- and trans-SNARE complexes to promote homotypic vacuole fusion. J Biol Chem 2003; 278:1656-62. [PMID: 12427733 DOI: 10.1074/jbc.m209522200] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [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: 02/05/2023] Open
Abstract
It is presently not clear how the function of SNARE proteins is affected by their transmembrane domains. Here, we analyzed the role of the transmembrane domain of the vacuolar SNARE Vam3 by replacing it by a lipid anchor. Vacuoles with mutant Vam3 fuse poorly and have increased amounts of cis-SNARE complexes, indicating that they are more stable. As a consequence efficient cis-SNARE complex disassembly that occurs at priming as a prerequisite of fusion requires addition of exogenous Sec18. trans-SNARE complexes in this mutant accumulate up to 4-fold over wild type, suggesting that the transmembrane domain of Vam3 is required to transit through this step. Finally, palmitoylation of Vac8, a reaction that also occurs early during priming is reduced by almost one-half. Since palmitoylated Vac8 is required beyond trans-SNARE complex formation, this may partially explain the fusion deficiency.
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Affiliation(s)
- Jan Rohde
- Interdisziplinäres Zentrum für Neurowissenschaften, University of Heidelberg, Im Neuenheimer Feld 307, 69120 Heidelberg, Germany
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Veit M, Laage R, Dietrich L, Wang L, Ungermann C. Vac8p release from the SNARE complex and its palmitoylation are coupled and essential for vacuole fusion. EMBO J 2001; 20:3145-55. [PMID: 11406591 PMCID: PMC150195 DOI: 10.1093/emboj/20.12.3145] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.1] [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: 11/13/2022] Open
Abstract
Activated fatty acids stimulate budding and fusion in several cell-free assays for vesicular transport. This stimulation is thought to be due to protein palmitoylation, but relevant substrates have not yet been identified. We now report that Vac8p, a protein known to be required for vacuole inheritance, becomes palmitoylated when isolated yeast vacuoles are incubated under conditions that allow membrane fusion. Similar requirements for Vac8p palmitoylation and vacuole fusion, the inhibition of vacuole fusion by antibodies to Vac8p and the strongly reduced fusion of vacuoles lacking Vac8p suggest that palmitoylated Vac8p is essential for homotypic vacuole fusion. Strikingly, palmitoylation of Vac8p is blocked by the addition of antibodies to Sec18p (yeast NSF) only. Consistent with this, a portion of Vac8p is associated with the SNARE complex on vacuoles, which is lost during Sec18p- and ATP-dependent priming. During or after SNARE complex disassembly, palmitoylation occurs and anchors Vac8p to the vacuolar membrane. We propose that palmitoylation of Vac8p is regulated by the same machinery that controls membrane fusion.
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Affiliation(s)
| | - Rico Laage
- Department of Immunology and Molecular Biology, Vet.-Med. Faculty of the Free University Berlin, Philippstrasse 13, D-10115 Berlin,
Biochemie-Zentrum Heidelberg, University of Heidelberg, Im Neuenheimer Feld 328, D-69120 Heidelberg, Germany and Dartmouth Medical School, Department of Biochemistry, Hanover, NH 03755, USA Corresponding author e-mail:
| | - Lars Dietrich
- Department of Immunology and Molecular Biology, Vet.-Med. Faculty of the Free University Berlin, Philippstrasse 13, D-10115 Berlin,
Biochemie-Zentrum Heidelberg, University of Heidelberg, Im Neuenheimer Feld 328, D-69120 Heidelberg, Germany and Dartmouth Medical School, Department of Biochemistry, Hanover, NH 03755, USA Corresponding author e-mail:
| | - Li Wang
- Department of Immunology and Molecular Biology, Vet.-Med. Faculty of the Free University Berlin, Philippstrasse 13, D-10115 Berlin,
Biochemie-Zentrum Heidelberg, University of Heidelberg, Im Neuenheimer Feld 328, D-69120 Heidelberg, Germany and Dartmouth Medical School, Department of Biochemistry, Hanover, NH 03755, USA Corresponding author e-mail:
| | - Christian Ungermann
- Department of Immunology and Molecular Biology, Vet.-Med. Faculty of the Free University Berlin, Philippstrasse 13, D-10115 Berlin,
Biochemie-Zentrum Heidelberg, University of Heidelberg, Im Neuenheimer Feld 328, D-69120 Heidelberg, Germany and Dartmouth Medical School, Department of Biochemistry, Hanover, NH 03755, USA Corresponding author e-mail:
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Dietrich L, Ehrlich LS, LaGrassa TJ, Ebbets-Reed D, Carter C. Structural consequences of cyclophilin A binding on maturational refolding in human immunodeficiency virus type 1 capsid protein. J Virol 2001; 75:4721-33. [PMID: 11312344 PMCID: PMC114227 DOI: 10.1128/jvi.75.10.4721-4733.2001] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
While several cellular proteins are incorporated in the human immunodeficiency virus type 1 virion, cyclophilin (CyP) A is the only one whose absence has been demonstrated to impair infectivity. Incorporation of the cytosolic protein results from interaction with a highly exposed Pro-rich loop in the N-terminal region of the capsid (CA) domain of the precursor polyprotein, Pr55(Gag). Even when prevented from interacting with CyP A, Pr55Gag still forms particles that proceed to mature into morphologically wild-type virions, suggesting that CyP A influences a postassembly event. The nature of this CyP A influence has yet to be elucidated. Here, we show that while CyP A binds both Gag and mature CA proteins, the two binding interactions are actually different. Tryptophan 121 (W121) in CyP A distinguished the two proteins: a phenylalanine substitution (W121F) impaired binding of mature CA protein but not of Gag. This indicates the occurrence of a maturation-dependent switch in the conformation of the Pro-rich loop. A structural consequence of Gag binding to CyP A was to block this maturational refolding, resulting in a 24-kDa CA protein retaining the immature Pro-rich loop conformation. Using trypsin as a structure probe, we demonstrate that the conformation of the C-terminal region in mature CA is also a product of maturational refolding. Binding to wild-type CyP A altered this conformation, as indicated by a reduction in the accessibility of Cys residue(s) in the region to chemical modification. Hence, the end result of binding to CyP A, whether the Pro-rich loop is in the context of Gag or mature CA protein, is a structurally modified mature CA protein. The postassembly role of CyP A may be mediated through these modified mature CA proteins.
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Affiliation(s)
- L Dietrich
- Department of Molecular Genetics and Microbiology, State University of New York at Stony Brook, Stony Brook, New York 11794-5222, USA
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Dietrich L. [Coping by psycho-oncological counseling]. Krankenpfl Soins Infirm 2001; 94:17. [PMID: 11944155] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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Dietrich L. [My work place. "How can I help you?"]. Krankenpfl Soins Infirm 1992; 85:35. [PMID: 1494259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Dietrich L. The caring nursing environment. NLN Publ 1992:69-87. [PMID: 1494483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Abstract
61 Patients with caput obstipum musculare were operated on our clinic between 1968 to 1985. 45 patients were examined after cosmetic and functional criteria (Manitz 1974, Stein et al., 1985). We found 28 "very good", 10 "good", 6 "satisfactory" and 1 "insufficient" results after the criteria established by Leuschner (1967).
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Affiliation(s)
- L Brückner
- Klinik für Orthopädie, Karl-Marx-Universität, Leipzig
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Brenke H, Dietrich L. [Sport methods recommended for patients with Scheuermann's disease]. Beitr Orthop Traumatol 1979; 26:440-4. [PMID: 539984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Lapple CE, Dietrich L. Mechanische Industrie-Entstauber. CHEM-ING-TECH 1953. [DOI: 10.1002/cite.330250408] [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: 11/10/2022]
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