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Rowe N, Keenan R, Lack L, Malloy N, Strasser R, Lawrenson R. Community engagement in general practice: a qualitative study. J Prim Health Care 2020; 11:146-151. [PMID: 32171357 DOI: 10.1071/hc18092] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 05/29/2019] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Community engagement is believed to be an important component of quality primary health care. We aimed to capture specific examples of community engagement by general practices, and to understand the barriers that prevent engagement. METHODS We conducted 20 distinct interviews with 31 key informants from general practice and the wider community. The interviews were semi-structured around key relevant topics and were analysed thematically. RESULTS Key themes identified from the interview transcripts included an understanding of 'community', examples of community engagement and the perceived benefits and barriers to community-engaged general practice. We particularly explored aspects of community engagement with Māori. CONCLUSIONS General practices in the study do not think in terms of communities, and they do not have a systematic framework for engagement. Although local champions have generated some great initiatives, most practices seemed to lack a conceptual framework for engagement: who to engage with, how to engage with them, and how to evaluate the results of the engagement.
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Affiliation(s)
- N Rowe
- Flinders University, College of Medicine and Public Health, Adelaide, SA 5000, Australia
| | - R Keenan
- University of Waikato, Medical Research Centre, Hamilton 3240, New Zealand
| | - L Lack
- University of Waikato, Medical Research Centre, Hamilton 3240, New Zealand
| | - N Malloy
- Wellsford Medical Centre, Wellsford 0940, New Zealand
| | - R Strasser
- Northern Ontario School of Medicine, Lakehead University, Thunder Bay, Ontario P7B5E1, Canada
| | - R Lawrenson
- University of Waikato, Medical Research Centre, Hamilton 3240, New Zealand; and Corresponding author.
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Kretzler L, Wunderlich C, Christoph M, Langbein A, Spitzer SG, Gerk U, Schellong S, Ketteler T, Neuser H, Schwefer M, Strasser R, Mues C, Ibrahim K, Schoen SP. P3711Impact of peri-device leakage after interventional occlusion of the left atrial appendage: Results from the ORIGINAL registry (saxOnian RegIstry analyzinG and followINg left atrial Appendage cLosure). Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0565] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Oral anticoagulation for prophylaxis of central and peripheral embolisation is limited in its use in patients with atrial fibrillation (AF) and bleeding events. As an alternative to anticoagulation, the interventional closure of the left atrial appendage (LAAO) is available. A common clinical dilemma is the treatment of patients with potential peri-device leakage following LAA occlusion. The specific definition of the severity of the leak and the long-term clinical implications have not yet been sufficiently investigated.
Methods
The multi-centre ORIGINAL registry was initiated 2014. The aim of this registry is to analyze the safety and efficacy of the procedure in patients with a high risk of bleeding in everyday clinical practice and to evaluate hemorrhagic and thromboemb. events in the long term follow-up. Patients with an indication for LAA occl. were included in the registry after informed consent. The impl., follow-up and anticoagulation regimens are performed according to the standard of the participating centers. 521 patients with AF underwent an implantation of an LAA closure device between Jul. 2014 and Nov. 2018. A mean follow-up of 463 days could be reached in 386 patients.
Results
The periprocedural complication rate was 3.8% of which 5 patients experienced pericardial effusion (successful treatment with pericardial puncture or surgical), 2 patients had periprocedural stroke and 1 patient suffered from air embolism. In 27 patients a peri-device flow due to incomplete occlusion was detected by TEE (5.4% of the implantations). The size ranged between 1 and 8 mm (mean 2.28 mm (SD=2.11)). The eccentricity index (EI) of the LAA in these patients was 1.22 (SD 0.17), and thus the LAA rather oval, while those LAA without leakage tend to be more circular (EI 1.08 with SD=0.17). 2 of the patients with leakage (7.4%) experienced stroke or peripheral embolism, respectively. The annual risk for stroke/TIA/peripheral embolism of these patients was 5.84%, the annual risk of the patients without leakage was 2.04%. Patients with a leakage >6 mm were treated with rivaroxaban in full therapeutic dosage. One patient underwent an additional procedure.
Conclusion
The evaluation and management of para-device leakage after an interventional LAA occlusion represents a challenge. Currently, limited data are available on the optimal strategy. Those data indicate that residual peri-device flow into the LAA after percutaneous closure with the Watchman device represents no cause for alarm. However, our data suggest, that patients with peridevice leak might be at a higher risk of thromboembolic events. Furthermore, it could be shown, that these patients had rather oval ostium of the LAA, while those LAA without leakage tend to be more circular. This implicates the importance of advanced imaging methods, such as 3D-TEE, which are capable to precisely determine the size of the LAA and the degree of its circularity.
Acknowledgement/Funding
None
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Affiliation(s)
- L Kretzler
- Charite - Campus Virchow-Klinikum (CVK), Berlin, Germany
| | | | | | - A Langbein
- Praxisklinik Herz und Gefäße, Dresden, Germany
| | - S G Spitzer
- Praxisklinik Herz und Gefäße, Dresden, Germany
| | - U Gerk
- City Hospital Dresden-Friedrichstadt, Dresden, Germany
| | - S Schellong
- City Hospital Dresden-Friedrichstadt, Dresden, Germany
| | | | - H Neuser
- HELIOS Hospital, Plauen, Germany
| | | | - R Strasser
- Dresden University of Technology, Dresden, Germany
| | - C Mues
- University Hospital Dresden, Dresden, Germany
| | - K Ibrahim
- University Hospital Dresden, Dresden, Germany
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Jilek C, Pauschinger M, von Scheidt W, Frankenstein L, Pfister O, Hambrecht R, Bruder O, Brachmann J, Hartmann A, Strasser R, Lewalter T, Hochadel M, Senges J. P4938Cardioverter-defibrillator does not improve survival among patients with dilative cardiomyopathy and reduced LV ejection fraction: Data from real-world registry EVITA-HF - The answer to DANISH. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p4938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Waessnig N, Guenther M, Quick S, Wiedemann S, Heidrich F, Sveric K, Strasser R, Ibrahim K, Speiser U. P6398Preventing premature implantable cardioverter defibrillator therapy (ICD) by using the wearable cardioverter-defibrillator (WCD). Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p6398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Quick S, Reuner U, Weidauer M, Hempel C, Waessnig N, Mues C, Sveric K, Heidrich F, Reichmann H, Strasser R, Speiser U. 4096Cardiac manifestation in wilson disease. The CARMA Wilson study. A comprehensive clinical and cardiac imaging trial. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.4096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Braun S, Platzek I, Danowski D, Zöphel K, Weise M, Kolditz M, Katzke S, Strasser R, Höffken G, Halank M. Klinische Bedeutung der CT Pulmonalis-Venografie. Pneumologie 2017. [DOI: 10.1055/s-0037-1598571] [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: 10/20/2022]
Affiliation(s)
- S Braun
- Abteilung für Pneumologie, Medizinische Klinik I, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
| | - I Platzek
- Institut für Radiologie, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
| | - D Danowski
- Institut für Radiologie, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
| | - K Zöphel
- Institut für Nuklearmedizin, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
| | - M Weise
- Abteilung für Internistische Intensivmedizin, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
| | - M Kolditz
- Abteilung für Pneumologie, Medizinische Klinik I, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
| | - S Katzke
- Herzzentrum Dresden, Abteilung für Kardiologie, Universitätsklinik Dresden
| | - R Strasser
- Herzzentrum Dresden, Abteilung für Kardiologie, Universitätsklinik Dresden
| | - G Höffken
- Abteilung für Pneumologie, Medizinische Klinik I, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
| | - M Halank
- Abteilung für Pneumologie, Medizinische Klinik I, Universitätsklinik Carl Gustav Carus, Technische Universität Dresden
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van Bergen B, Cyr N, Strasser R, Blanchette M, Sheppard JD, Jardim A. α,β-Dicarbonyl reduction is mediated by the Saccharomyces Old Yellow Enzyme. FEMS Yeast Res 2016; 16:fow059. [PMID: 27400981 DOI: 10.1093/femsyr/fow059] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/03/2016] [Indexed: 11/13/2022] Open
Abstract
The undesirable flavor compounds diacetyl and 2,3-pentanedione are vicinal diketones (VDKs) formed by extracellular oxidative decarboxylation of intermediate metabolites of the isoleucine, leucine and valine (ILV) biosynthetic pathway. These VDKs are taken up by Saccharomyces and enzymatically converted to acetoin and 3-hydroxy-2-pentanone, respectively. Purification of a highly enriched diacetyl reductase fraction from Saccharomyces cerevisiae in conjunction with mass spectrometry identified Old Yellow Enzyme (Oye) as an enzyme capable of catalyzing VDK reduction. Kinetic analysis of recombinant Oye1p, Oye2p and Oye3p isoforms confirmed that all three isoforms reduced diacetyl and 2,3-pentanedione in an NADPH-dependent reaction. Transcriptomic analysis of S. cerevisiae (ale) and S. pastorianus (lager) yeast during industrial fermentations showed that the transcripts for OYE1, OYE2, arabinose dehydrogenase (ARA1), α-acetolactate synthase (ILV2) and α-acetohydroxyacid reductoisomerase (ILV5) were differentially regulated in a manner that correlated with changes in extracellular levels of VDKs. These studies provide insights into the mechanism for reducing VDKs and decreasing maturation times of beer which are of commercial importance.
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Affiliation(s)
- Barry van Bergen
- Department of Bioresource Engineering, Macdonald Campus of McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, QC H9X 3V9, Canada
| | - Normand Cyr
- Institute of Parasitology, Macdonald Campus of McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, QC H9X 3V9, Canada Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, NC 27612, USA
| | - Rona Strasser
- Institute of Parasitology, Macdonald Campus of McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, QC H9X 3V9, Canada
| | - Maxime Blanchette
- Department of Bioresource Engineering, Macdonald Campus of McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, QC H9X 3V9, Canada
| | - John D Sheppard
- Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, NC 27612, USA
| | - Armando Jardim
- Institute of Parasitology, Macdonald Campus of McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, QC H9X 3V9, Canada
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Goldman-Pinkovich A, Balno C, Strasser R, Zeituni-Molad M, Bendelak K, Rentsch D, Ephros M, Wiese M, Jardim A, Myler PJ, Zilberstein D. An Arginine Deprivation Response Pathway Is Induced in Leishmania during Macrophage Invasion. PLoS Pathog 2016; 12:e1005494. [PMID: 27043018 PMCID: PMC4846328 DOI: 10.1371/journal.ppat.1005494] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 02/15/2016] [Indexed: 11/18/2022] Open
Abstract
Amino acid sensing is an intracellular function that supports nutrient homeostasis, largely through controlled release of amino acids from lysosomal pools. The intracellular pathogen Leishmania resides and proliferates within human macrophage phagolysosomes. Here we describe a new pathway in Leishmania that specifically senses the extracellular levels of arginine, an amino acid that is essential for the parasite. During infection, the macrophage arginine pool is depleted due to its use to produce metabolites (NO and polyamines) that constitute part of the host defense response and its suppression, respectively. We found that parasites respond to this shortage of arginine by up-regulating expression and activity of the Leishmania arginine transporter (LdAAP3), as well as several other transporters. Our analysis indicates the parasite monitors arginine levels in the environment rather than the intracellular pools. Phosphoproteomics and genetic analysis indicates that the arginine-deprivation response is mediated through a mitogen-activated protein kinase-2-dependent signaling cascade. Protozoa of the genus Leishmania are the causative agents of leishmaniasis in humans. These parasites cycle between promastigotes in the sand fly mid-gut and amastigotes in phagolysosome of mammalian macrophages. During infection, host cells up-regulate nitric oxide while/or parasites induce expression of host arginase, both of which use arginine as a substrate. These elevated activities deplete macrophage arginine pools, a situation that invading Leishmania must overcome since it is an essential amino acid. Leishmania donovani imports exogenous arginine via a mono-specific amino acid transporter (AAP3) and utilizes it primarily through the polyamine pathway to provide precursors for trypanothione biosynthesis as well as hypusination of eukaryotic translation Initiation Factor 5A. Here we report the discovery of a pathway whereby Leishmania sense the lack of environmental arginine and respond with rapid up-regulation in the expression and activity of AAP3, as well as several other transporters. Significantly, this arginine deprivation response is also activated in parasites during macrophage infection. Phosphoproteomic analyses of L. donovani promastigotes have implicated a mitogen-activated protein kinase 2 (MPK2)-mediated signaling cascade in this response, and L. mexicana mutants lacking MPK2 are unable to respond to arginine deprivation. The arginine-sensing pathway might play an important role in Leishmania virulence and hence serve as target for drug development.
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Affiliation(s)
| | - Caitlin Balno
- Faculty of Biology, Technion—Israel Institute of Technology, Haifa, Haifa, Israel
| | - Rona Strasser
- Institute of Parasitology, McGill University, Ste Anne de Bellevue, Quebec, Canada
| | - Michal Zeituni-Molad
- Carmel Medical Center and Faculty of Medicine, Technion,—Israel institute of Technology, Haifa, Israel
| | - Keren Bendelak
- The Smoler Proteomic Center, Faculty of Biology, Technion-Israel Institute of Technology, Haifa, Israel
| | - Doris Rentsch
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | - Moshe Ephros
- Carmel Medical Center and Faculty of Medicine, Technion,—Israel institute of Technology, Haifa, Israel
| | - Martin Wiese
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom
| | - Armando Jardim
- Institute of Parasitology, McGill University, Ste Anne de Bellevue, Quebec, Canada
| | - Peter J. Myler
- Center for Infectious Disease Research, formerly Seattle Biomedical Research Institute, Seattle, Washington, United States of America
- Departments of Global Health and Biomedical Informatics & Medical Education, University of Washington, Seattle, Washington, United States of America
| | - Dan Zilberstein
- Faculty of Biology, Technion—Israel Institute of Technology, Haifa, Haifa, Israel
- * E-mail:
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Ellaway RH, O'Gorman L, Strasser R, Marsh DC, Graves L, Fink P, Cervin C. A critical hybrid realist-outcomes systematic review of relationships between medical education programmes and communities: BEME Guide No. 35. Med Teach 2016; 38:229-45. [PMID: 26646982 DOI: 10.3109/0142159x.2015.1112894] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
BACKGROUND The relationships between medical schools and communities have long inspired and troubled medical education programmes. Successive models of community-oriented, community-based and community-engaged medical education have promised much and delivered to varying degrees. A two-armed realist systematic review was undertaken to explore and synthesize the evidence on medical school-community relationships. METHOD One arm used standard outcomes criteria (Kirkpatrick levels), the other a realist approach seeking out the underlying contexts, mechanisms and outcomes. 38 reviewers completed 489 realist reviews and 271 outcomes reviews; 334 articles were reviewed in the realist arm and 181 in the outcomes arm. Analyses were based on: descriptive statistics on both articles and reviews; the outcomes involved; the quality of the evidence presented; realist contexts, mechanisms, and outcomes; and an analysis of underlying discursive themes. FINDINGS The literature on medical school-community relationships is heterogeneous and largely idiographic, with no common standards for what a community is, who represents communities, what a relationship is based on, or whose needs are or should be being addressed or considered. CONCLUSIONS Community relationships can benefit medical education, even if it is not always clear why or how. There is much opportunity to improve the quality and precision of scholarship in this area.
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Affiliation(s)
- R H Ellaway
- a Northern Ontario School of Medicine , Canada
- b University of Calgary , Canada
| | - L O'Gorman
- a Northern Ontario School of Medicine , Canada
- c Laurentian University , Canada
| | - R Strasser
- a Northern Ontario School of Medicine , Canada
| | - D C Marsh
- a Northern Ontario School of Medicine , Canada
| | - L Graves
- a Northern Ontario School of Medicine , Canada
- d University of Toronto , Canada
| | - P Fink
- a Northern Ontario School of Medicine , Canada
| | - C Cervin
- a Northern Ontario School of Medicine , Canada
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Quick S, Speiser U, Kury K, Schoen S, Ibrahim K, Strasser R. Evaluation and classification of right ventricular wall motion abnormalities in healthy subjects by 3-tesla cardiovascular magnetic resonance imaging. Neth Heart J 2014; 23:64-9. [PMID: 25339203 PMCID: PMC4268217 DOI: 10.1007/s12471-014-0620-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
BACKGROUND Right ventricular (RV) shape and function serves as an indicator in several types of heart disease such as arrhythmogenic right ventricular dysplasia (ARVD). However, there is no in-depth knowledge of RV motion, even in healthy subjects. The aim of our study was to provide a quantitative analysis of normal variations in RV wall motion in healthy subjects by cardiac magnetic resonance imaging (CMRI). MATERIAL AND METHODS The study population consisted of 65 consecutive patients referred for the evaluation of cardiac function by 3 Tesla CMR. Balanced steady-state free-precession images were obtained and areas of disordered RV wall motion were evaluated and classified based on a standardised segmental model for the right ventricle. RESULTS In 59 patients (90.8 %) wall motion abnormalities (WMA) of the right ventricle were evident. WMA were predominately detected in the apicolateral segments (72 %) compared with mediolateral (24 %, P < 0.001) and inferolateral segments (4 %, P < 0.001). Dyskinesia was the most frequent wall motion disorder (62.4 %), followed by hypokinesia (20.8 %) and bulging (16.8 %). The mean WMA diameter in the transverse plane (6.4 ± 1.9 mm) was significantly shorter compared with the diameter in the horizontal long-axis (8.1 ± 3.6 mm, P = 0.002) and short-axis plane (10.7 ± 4.6 mm). CONCLUSION WMA of the right ventricle are common. Therefore, one should be aware that these nonpathological wall motion disorders can easily be mistaken for a pathological regional wall motion contraction, particularly in ARVD where to date, clear wall motion criteria are lacking.
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Affiliation(s)
- S Quick
- Department of Internal Medicine and Cardiology, Technische Universitaet Dresden Heart Center University Hospital, Fetscherstr 76, 01307, Dresden, Germany,
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Kovacs A, Assabiny A, Lakatos B, Apor A, Nagy A, Kutyifa V, Merkely B, Ulbrich S, Sveric K, Rady M, Strasser R, Ebner B, Lervik Nilsen LC, Brekke B, Missant C, Ortega A, Haemers P, Tong L, Sutherland G, D'hooge J, Stoylen A, Gurzun MM, Ionescu A, Santoro A, Federico Alvino F, Carlo Gaetano Sassi C, Giovanni Antonelli G, Sergio Mondillo S, Chumarnaya T, Alueva Y, Kochmasheva V, Mikhailov S, Ostern O, Solovyova O, Revishvili A, Markhasin V, Rodriguez Munoz D, Carbonell Sanroman A, Moya Mur J, Fernandez Santos S, Lazaro Rivera C, Valverde Gomez M, Casas Rojo E, Garcia Martin A, Fernandez-Golfin C, Zamorano Gomez J, Kanda T, Fujita M, Masuda M, Iida O, Okamoto S, Ishihara T, Nanto K, Shiraki T, Takahara M, Uematsu M, Kolesnyk MY, Victor K, Lux D, Carr-White G, Barrett N, Glover G, Langrish C, Meadows C, Ioannou N, Castaldi B, Vida V, Argiolas A, Maschietto N, Cerutti A, Biffanti R, Reffo E, Padalino M, Stellin G, Milanesi O, Simova I, Katova T, Galderisi M, Lalov I, Onciul S, Alexandrescu A, Petre I, Zamfir D, Onut R, Tautu O, Dorobantu M, Caldas A, Ladeia A, D'almeida J, Guimaraes A, Ball C, Abdelmoneim Mohamed S, Huang R, Zysek V, Mantovani F, Scott C, Mccully R, Mulvagh S, Lee JH, Cho G, Mihaila S, Muraru D, Aruta P, Piasentini E, Cavalli G, Ucci L, Peluso D, Vinereanu D, Iliceto S, Badano L, Ozawa K, Funabashi N, Takaoka H, Kamata T, Nomura F, Kobayashi Y, Ovsianas J, Valuckiene Z, Mizariene V, Jurkevicius R, Reskovic Luksic V, Dosen D, Cekovic S, Separovic Hanzevacki J, Simova I, Katova T, Santoro C, Galderisi M, Kalcik M, Cakal B, Gursoy M, Astarcioglu M, Yesin M, Gunduz S, Karakoyun S, Cersit S, Toprak C, Ozkan M. Club 35 Poster session 3: Friday 5 December 2014, 08:30-18:00 * Location: Poster area. Eur Heart J Cardiovasc Imaging 2014. [DOI: 10.1093/ehjci/jeu263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Strasser R, Volm M. Untersuchungen über spezifische Einflüsse des Serums und Lebercytoplasmas auf den [3H]TTP-Einbau isolierter Leberzellkerne / Studies on the Specific Effects of Serum and Cytoplasm of the Liver on the [3H]TTP-Incorporation of Isolated Liver Nuclei. Z NATURFORSCH C 2014. [DOI: 10.1515/znc-1978-3-409] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Previous authors have described that liver cytoplasm and serum from partially hepatectomized rats stimulate the DNA synthesis of isolated nuclei of liver cells. The aim of our investigation was to prove whether such stimulating effects are part of a specific regulation of growth. The sera and the cytoplasm supernatant 105 000Xg) were isolated at several intervals after partial hepatectomy and laparotomy and were tested on isolated nuclei of liver cells from adult rats partially hepatectomized 20 hours before. The supernatants isolated at 8 and 16 hours after both partial hepatectomy and laparotomy have a significant stimulatory effect on the [3H]TTP-uptake by nuclei.
The presence of serum (10%) causes a general elevation (75%) of the [3H]TTP-uptake by isolated nuclei. The sera isolated 4 to 12 hours after operation from both partially hepatectomized and laparotomized rats have an additional stimulatory effect on the [3H]TTP-uptake synthes of nuclei. In no case did the sera and liver cytoplasm of partially hepatectomized rats have a significantly different and therefore “specific” effect on the nuclear DNA synthesis.
Additional experiments showed that frozen and thawed nuclei of liver cells respond only to the nutritive power but not to the stimulatory effects of the sera. Thus, thawed nuclei cannot be used for growth investigations.
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Affiliation(s)
- R. Strasser
- Deutsches Krebsforschungszentrum, Institut für Experimentelle Pathologie, Heidelberg
| | - M. Volm
- Deutsches Krebsforschungszentrum, Institut für Experimentelle Pathologie, Heidelberg
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Goltsev V, Zaharieva I, Chernev P, Strasser R. Delayed Chlorophyll Fluorescence as a Monitor for Physiological State of Photosynthetic Apparatus. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2009.10818461] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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Caiani E, Pellegrini A, Carminati M, Lang R, Auricchio A, Vaida P, Obase K, Sakakura T, Komeda M, Okura H, Yoshida K, Zeppellini R, Noni M, Rigo T, Erente G, Carasi M, Costa A, Ramondo B, Thorell L, Akesson-Lindow T, Shahgaldi K, Germanakis I, Fotaki A, Peppes S, Sifakis S, Parthenakis F, Makrigiannakis A, Richter U, Sveric K, Forkmann M, Wunderlich C, Strasser R, Djikic D, Potpara T, Polovina M, Marcetic Z, Peric V, Ostenfeld E, Werther-Evaldsson A, Engblom H, Ingvarsson A, Roijer A, Meurling C, Holm J, Radegran G, Carlsson M, Tabuchi H, Yamanaka T, Katahira Y, Tanaka M, Kurokawa T, Nakajima H, Ohtsuki S, Saijo Y, Yambe T, D'alto M, Romeo E, Argiento P, D'andrea A, Vanderpool R, Correra A, Sarubbi B, Calabro' R, Russo M, Naeije R, Saha SK, Warsame TA, Caelian AG, Malicse M, Kiotsekoglou A, Omran AS, Sharif D, Sharif-Rasslan A, Shahla C, Khalil A, Rosenschein U, Erturk M, Oner E, Kalkan A, Pusuroglu H, Ozyilmaz S, Akgul O, Aksu H, Akturk F, Celik O, Uslu N, Bandera F, Pellegrino M, 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G, Malev E, Reeva S, Vasina L, Pshepiy A, Korshunova A, Timofeev E, Zemtsovsky E, Jorgensen PG, Jensen J, Fritz-Hansen T, Biering-Sorensen T, Jons C, Olsen N, Henri C, Magne J, Dulgheru R, Laaraibi S, Voilliot D, Kou S, Pierard L, Lancellotti P, Tayyareci Y, Dworakowski R, Kogoj P, Reiken J, Kenny C, Maccarthy P, Wendler O, Monaghan M, Song J, Ha T, Jung Y, Seo M, Choi S, Kim Y, Sun B, Kim D, Kang D, Song J, Le Tourneau T, Topilsky Y, Inamo J, Mahoney D, Suri R, Schaff H, Enriquez-Sarano M, Bonaque Gonzalez J, Sanchez Espino A, Merchan Ortega G, Bolivar Herrera N, Ikuta I, Macancela Quinonez J, Munoz Troyano S, Ferrer Lopez R, Gomez Recio M, Dreyfus J, Cimadevilla C, Brochet E, Himbert D, Iung B, Vahanian A, Messika-Zeitoun D, Izumo M, Takeuchi M, Seo Y, Yamashita E, Suzuki K, Ishizu T, Sato K, Aonuma K, Otsuji Y, Akashi Y, Muraru D, Addetia K, Veronesi F, Corsi C, Mor-Avi V, Yamat M, Weinert L, Lang R, Badano L, Minamisawa M, Koyama J, Kozuka A, Motoki H, Izawa A, Tomita T, Miyashita Y, Ikeda U, Florescu C, Niemann M, Liu D, Hu K, Herrmann S, Gaudron P, Scholz F, Stoerk S, Ertl G, Weidemann F, Marchel M, Serafin A, Kochanowski J, Piatkowski R, Madej-Pilarczyk A, Filipiak K, Hausmanowa-Petrusewicz I, Opolski G, Meimoun P, M'barek D, Clerc J, Neikova A, Elmkies F, Tzvetkov B, Luycx-Bore A, Cardoso C, Zemir H, Mansencal N, Arslan M, El Mahmoud R, Pilliere R, Dubourg O, Ikonomidis I, Lambadiari V, Pavlidis G, Koukoulis C, Kousathana F, Varoudi M, Tritakis V, Triantafyllidi H, Dimitriadis G, Lekakis I, Kovacs A, Kosztin A, Solymossy K, Celeng C, Apor A, Faludi M, Berta K, Szeplaki G, Foldes G, Merkely B, Kimura K, Daimon M, Nakajima T, Motoyoshi Y, Komori T, Nakao T, Kawata T, Uno K, Takenaka K, Komuro I, Gabric ID, Vazdar L, Pintaric H, Planinc D, Vinter O, Trbusic M, Bulj N, Nobre Menezes M, Silva Marques J, Magalhaes R, Carvalho V, Costa P, Brito D, Almeida A, Nunes-Diogo A, Davidsen ES, Bergerot C, Ernande L, Barthelet M, Thivolet S, Decker-Bellaton A, Altman M, Thibault H, Moulin P, Derumeaux G, Huttin O, Voilliot D, Frikha Z, Aliot E, Venner C, Juilliere Y, Selton-Suty C, Yamada T, Ooshima M, Hayashi H, Okabe S, Johno H, Murata H, Charalampopoulos A, Tzoulaki I, Howard L, Davies R, Gin-Sing W, Grapsa J, Wilkins M, Gibbs J, Castillo J, Bandeira A, Albuquerque E, Silveira C, Pyankov V, Chuyasova Y, Lichodziejewska B, Goliszek S, Kurnicka K, Dzikowska Diduch O, Kostrubiec M, Krupa M, Grudzka K, Ciurzynski M, Palczewski P, Pruszczyk P, Arana X, Oria G, Onaindia J, Rodriguez I, Velasco S, Cacicedo A, Palomar S, Subinas A, Zumalde J, Laraudogoitia E, Saeed S, Kokorina M, Fromm A, Oeygarden H, Waje-Andreassen U, Gerdts E, Gomez E, Vallejo N, Pedro-Botet L, Mateu L, Nunyez R, Llobera L, Bayes A, Sabria M, Antonini-Canterin F, Mateescu A, La Carrubba S, Vriz O, Di Bello V, Carerj S, Zito C, Ginghina C, Popescu B, Nicolosi G, Mateescu A, La Carrubba S, Vriz O, Di Bello V, Carerj S, Zito C, Ginghina C, Popescu B, Nicolosi G, Antonini-Canterin F, Pudil R, Praus R, Vasatova M, Vojacek J, Palicka V, Hulek P, Pradel S, Mohty D, Damy T, Echahidi N, Lavergne D, Virot P, Aboyans V, Jaccard A, Mateescu A, La Carrubba S, Vriz O, Di Bello V, Carerj S, Zito C, Ginghina C, Popescu B, Nicolosi G, Antonini-Canterin F, Doulaptsis C, Symons R, Matos A, Florian A, Masci P, Dymarkowski S, Janssens S, Bogaert J, Lestuzzi C, Moreo A, Celik S, Lafaras C, Dequanter D, Tomkowski W, De Biasio M, Cervesato E, Massa L, Imazio M, Watanabe N, Kijima Y, Akagi T, Toh N, Oe H, Nakagawa K, Tanabe Y, Ikeda M, Okada K, Ito H, Milanesi O, Biffanti R, Varotto E, Cerutti A, Reffo E, Castaldi B, Maschietto N, Vida V, Padalino M, Stellin G, Bejiqi R, Retkoceri R, Bejiqi H, Retkoceri A, Surdulli S, Massoure P, Cautela J, Roche N, Chenilleau M, Gil J, Fourcade L, Akhundova A, Cincin A, Sunbul M, Sari I, Tigen M, Basaran Y, Suermeci G, Butz T, Schilling I, Sasko B, Liebeton J, Van Bracht M, Tzikas S, Prull M, Wennemann R, Trappe H, Attenhofer Jost CH, Pfyffer M, Scharf C, Seifert B, Faeh-Gunz A, Naegeli B, Candinas R, Medeiros-Domingo A, Wierzbowska-Drabik K, Roszczyk N, Sobczak M, Plewka M, Krecki R, Kasprzak J, Ikonomidis I, Varoudi M, Papadavid E, Theodoropoulos K, Papadakis I, Pavlidis G, Triantafyllidi H, Anastasiou - Nana M, Rigopoulos D, Lekakis J, Tereshina O, Surkova E, Vachev A, Merchan Ortega G, Bonaque Gonzalez J, Sanchez Espino A, Bolivar Herrera N, Bravo Bustos D, Ikuta I, Aguado Martin M, Navarro Garcia F, Ruiz Lopez F, Gomez Recio M, Merchan Ortega G, Bonaque Gonzalez J, Bravo Bustos D, Sanchez Espino A, Bolivar Herrera N, Bonaque Gonzalez J, Navarro Garcia F, Aguado Martin M, Ruiz Lopez M, Gomez Recio M, Eguchi H, Maruo T, Endo K, Nakamura K, Yokota K, Fuku Y, Yamamoto H, Komiya T, Kadota K, Mitsudo K, Nagy AI, Manouras A, Gunyeli E, Shahgaldi K, Winter R, Hoffmann R, Barletta G, Von Bardeleben S, Kasprzak J, Greis C, Vanoverschelde J, Becher H, Hu K, Liu D, Niemann M, Herrmann S, Cikes M, Gaudron P, Knop S, Ertl G, Bijnens B, Weidemann F, Di Salvo G, Al Bulbul Z, Issa Z, Khan A, Faiz A, Rahmatullah S, Fadel B, Siblini G, Al Fayyadh M, Menting ME, Van Den Bosch A, Mcghie J, Cuypers J, Witsenburg M, Van Dalen B, Geleijnse M, Roos-Hesselink J, Olsen F, Jorgensen P, Mogelvang R, Jensen J, Fritz-Hansen T, Bech J, Biering-Sorensen T, Agoston G, Pap R, Saghy L, Forster T, Varga A, Scandura S, Capodanno D, Dipasqua F, Mangiafico S, Caggegi AM, Grasso C, Pistritto AM, Imme' S, Ministeri M, Tamburino C, Cameli M, Lisi M, D'ascenzi F, Cameli P, Losito M, Sparla S, Lunghetti S, Favilli R, Fineschi M, Mondillo S, Ojaghihaghighi Z, Javani B, Haghjoo M, Moladoust H, Shahrzad S, Ghadrdoust B, Altman M, Aussoleil A, Bergerot C, Bonnefoy-Cudraz E, Derumeaux GA, Thibault H, Shkolnik E, Vasyuk Y, Nesvetov V, Shkolnik L, Varlan G, Gronkova N, Kinova E, Borizanova A, Goudev A, Saracoglu E, Ural D, Sahin T, Al N, Cakmak H, Akbulut T, Akay K, Ural E, Mushtaq S, Andreini D, Pontone G, Bertella E, Conte E, Baggiano A, Annoni A, Formenti A, Fiorentini C, Pepi M, Cosgrove C, Carr L, Chao C, Dahiya A, Prasad S, Younger J, Biering-Sorensen T, Christensen L, Krieger D, Mogelvang R, Jensen J, Hojberg S, Host N, Karlsen F, Christensen H, Medressova A, Abikeyeva L, Dzhetybayeva S, Andossova S, Kuatbayev Y, Bekbossynova M, Bekbossynov S, Pya Y, Farsalinos K, Tsiapras D, Kyrzopoulos S, Spyrou A, Stefopoulos C, Romagna G, Tsimopoulou K, Tsakalou M, Voudris V, Cacicedo A, Velasco Del Castillo S, Anton Ladislao A, Aguirre Larracoechea U, Onaindia Gandarias J, Romero Pereiro A, Arana Achaga X, Zugazabeitia Irazabal G, Laraudogoitia Zaldumbide E, Lekuona Goya I, Varela A, Kotsovilis S, Salagianni M, Andreakos V, Davos C, Merchan Ortega G, Bonaque Gonzalez J, Sanchez Espino A, Bolivar Herrera N, Macancela Quinones J, Ikuta I, Ferrer Lopez R, Munoz Troyano S, Bravo Bustos D, Gomez Recio M. Poster session Friday 13 December - PM: 13/12/2013, 14:00-18:00 * Location: Poster area. Eur Heart J Cardiovasc Imaging 2013. [DOI: 10.1093/ehjci/jet206] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ibrahim K, Christoph MC, Schmeinck S, Schmieder K, Kolschmann S, Steiding K, Pfluecke C, Strasser R, Wunderlich C. High rate of ticagrelor and prasugrel- non-responder in patients in therapeutic hypothermia after cardiac arrest. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Boitz JM, Strasser R, Yates PA, Jardim A, Ullman B. Adenylosuccinate synthetase and adenylosuccinate lyase deficiencies trigger growth and infectivity deficits in Leishmania donovani. J Biol Chem 2013; 288:8977-90. [PMID: 23404497 DOI: 10.1074/jbc.m112.431486] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Leishmania are auxotrophic for purines, and consequently purine acquisition from the host is a requisite nutritional function for the parasite. Both adenylosuccinate synthetase (ADSS) and adenylosuccinate lyase (ASL) have been identified as vital components of purine salvage in Leishmania donovani, and therefore Δadss and Δasl null mutants were constructed to test this hypothesis. Unlike wild type L. donovani, Δadss and Δasl parasites in culture exhibited a profoundly restricted growth phenotype in which the only permissive growth conditions were a 6-aminopurine source in the presence of 2'-deoxycoformycin, an inhibitor of adenine aminohydrolase activity. Although both knock-outs showed a diminished capacity to infect murine peritoneal macrophages, only the Δasl null mutant was profoundly incapacitated in its ability to infect mice. The enormous discrepancy in parasite loads observed in livers and spleens from mice infected with either Δadss or Δasl parasites can be explained by selective accumulation of adenylosuccinate in the Δasl knock-out and consequent starvation for guanylate nucleotides. Genetic complementation of a Δasl lesion in Escherichia coli implied that the L. donovani ASL could also recognize 5-aminoimidazole-(N-succinylocarboxamide) ribotide as a substrate, and purified recombinant ASL displayed an apparent Km of ∼24 μm for adenylosuccinate. Unlike many components of the purine salvage pathway of L. donovani, both ASL and ADSS are cytosolic enzymes. Overall, these data underscore the paramount importance of ASL to purine salvage by both life cycle stages of L. donovani and authenticate ASL as a potential drug target in Leishmania.
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Affiliation(s)
- Jan M Boitz
- Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, OR 97239, USA
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Fulcheri C, Veglio F, Styczynski G, Szmigielski CA, Kaczynska A, Kuch-Wocial A, Jansen R, Kracht P, Kluin J, Tietge W, Cramer M, Chamuleau S, Zito C, Tripepi S, Cusma-Piccione M, Di Bella G, Mohammed M, Oreto L, Manganaro R, D'angelo M, Pizzino F, Carerj S, Arapi S, Tsounis D, Matzraki V, Kaplanis I, Perpinia A, Varoudi M, Mpitsios G, Lazaros G, Karavidas A, Pyrgakis V, Mornos C, Ionac A, Cozma D, Mornos A, Dragulescu D, Petrescu L, Pescariu S, Lupinek P, Sramko M, Kubanek M, Kautznerova D, Tintera J, Lanska V, Kadrabulatova S, Pavlukova E, Tarasov D, Karpov R, Sveric K, Forkmann M, Richter U, Wunderlich C, Strasser R, Grapsa J, Dawson D, Zimbarra Cabrita I, Punjabi P, Nihoyannopoulos P, Kovacs A, Apor A, Nagy A, Vago H, Toth A, Becker D, Merkely B, Ranjbar S, Karvandi M, Hassantash S, Yoshikawa H, Suzuki M, Kusunose Y, Hashimoto G, Otsuka T, Nakamura M, Sugi K, De Knegt M, Biering-Sorensen T, Sogaard P, Sivertsen J, Jensen J, Mogelvang R, Montserrat S, Gabrielli L, Borras R, Bijnens B, Castella M, Berruezo A, Mont L, Brugada J, Sitges M, Tarr A, Stoebe S, Pfeiffer D, Hagendorff A, Ternacle J, Jurzak P, Gallet R, Champagne S, Teiger E, Monin JL, Gueret P, Dubois-Rande JL, Lim P, Monney P, Jeanrenaud X, Monivas Palomero V, Mingo Santos S, Garcia Lunar I, Beltran Correas P, Gonzalez Lopez E, Sanchez Garcia M, Gonzalez Mirelis J, Cavero Gibanel M, Gomez Bueno M, Segovia Cubero J, Haarman M, Van Den Bosch A, Domburg R, Mcghie J, Roos-Hesselink J, Geleijnse M, Yanikoglu A, Altekin E, Kucuk M, Karakas S, Ozel D, Yilmaz H, Demir I, Tsuruta H, Iwanaga S, Sato T, Miyoshi S, Nishiyama N, Aizawa Y, Tanimoto K, Murata M, Takatsuki S, Fukuda K, Carrilho-Ferreira P, Cortez-Dias N, Silva D, Jorge C, Goncalves S, Santos I, Sargento L, Marques P, Carpinteiro L, Sousa J, Schubert U, Kockova R, Tintera J, Kautznerova D, Cerna D, Sedlacek K, Kryze L, Sikula V, Segetova M, Kautzner J, Iwaki T, Dores H, Goncalves P, Sousa P, Carvalho M, Marques H, Machado F, Gaspar A, Aleixo A, Carmo M, Roquette J, Lagopati N, Sotiropoulos M, Baka I, Ploussi A, Lyra Georgosopoulou M, Miglioranza M, Gargani L, Sant'anna R, Rover M, Mantovani A, Kalil R, Sicari R, Picano E, Leiria T, Minarik T, Taborsky M, Fedorco M, Novak P, Ledakowicz-Polak A, Polak L, Zielinska M, Zhong L, Chin C, Lau Y, Sim L, Chua T, Tan B, Tan R. Poster session: Dobutamine stress echo. Eur Heart J Cardiovasc Imaging 2012. [DOI: 10.1093/ehjci/jes257] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Iliuta L, Uno K, Ebihara A, Hayashi N, Chigira M, Yoshikawa T, Kimura K, Yamagata H, Yatomi Y, Takenaka K, Neves A, Mathias L, Leshko J, Linask K, Henriques-Coelho T, Areias J, Huhta J, Barbier P, Castiglioni L, Colazzo F, Fontana L, Nobili E, Franzosi M, Li Causi T, Sironi L, Tremoli E, Guerrini U, Stankovic I, Claus P, Jasaityte R, Putnikovic B, Neskovic A, Voigt J, Kutty S, Attebery J, Yeager E, Truemper E, Li L, Hammel J, Danford D, Tumasyan L, Adamyan K, Chilingaryan A, Mjolstad O, Andersen G, Dalen H, Graven T, Kleinau J, Skjetne K, Haugen B, Sucu M, Uku O, Sari I, Ercan S, Davutoglu V, Ozer O, Kim S, Na JO, Im S, Choi C, Lim H, Kim J, Han S, Seo H, Park C, Oh D, Hammoudi N, Duprey M, Regnier P, Vignalou J, Boubrit L, Pousset F, Jobard O, Isnard R, Shin SH, Woo S, Kim D, Park K, Kwan J, Andersen G, Mjolstad O, Graven T, Kleinau J, Skjetne K, Haugen B, Dalen H, Grigoryan S, Tunyan L, Hazarapetyan L, Shkolnik E, Vasyuk Y, Nesvetov V, Ruddox V, Edvardsen T, Otterstad J, Patrianakos A, Zacharaki A, Kalogerakis A, Nyktari E, Psathakis E, Parthenakis F, Vardas P, Yodwut C, Weinert L, Lang R, Mor-Avi V, Bandera F, Arena R, Labate V, Castelvecchio S, Menicanti L, Guazzi M, Nedeljkovic I, Ostojic M, Stepanovic J, Giga V, Beleslin B, Popovic D, Djordjevic-Dikic A, Petrovic M, Nedeljkovic M, Seferovic P, Popovic D, Ostojic M, Popovic B, Petrovic M, Vujisic-Tesic B, Nedeljkovic I, Arandjelovic A, Banovic M, Seferovic P, Damjanovic S, Horovitz A, Iriart X, De Guillebon D, Reant P, Lafitte S, Thambo J, Venkatesh A, Shahgaldi K, Johnson J, Brodin L, Winter R, Sahlen A, Manouras A, Szulik M, Streb W, Kalarus Z, Kukulski T, Lesniak-Sobelga AM, Kostkiewicz M, Tomkiewicz-Pajak L, Olszowska M, Hlawaty M, Rubis P, Podolec P, Spinelli L, Di Panzillo EA, Morisco C, Crispo S, Trimarco B, Lutay Y, Parkhomenko A, Stepura A, Zamfir D, Tautu O, Nestoruc A, Onut R, Comanescu I, Scafa Udriste A, Dorobantu M, Guseva O, Zhuravskaya N, Bartosh-Zelenaya S, Zagatina A, Kekovic P, Isailovic-Kekovic M, Squeri A, Macri' G, Anglano F, Censi S, Conti R, Pizzarelli M, Trecroci U, Bosi S, Le Tourneau T, Probst V, Kyndt F, Duval D, Trochu J, Bernstein J, Hagege A, Levine R, Le Marec H, Schott J, Enache R, Muraru D, Popescu B, Mateescu A, Purcarea F, Calin A, Beladan C, Rosca M, Ginghina C, Urdaniz MM, Rodriguez Palomares JF, Rius JB, Acosta Velez JG, Garcia-Moreno LG, Tura GT, Alujas MTG, Mas PT, Masip AE, Dorado DG, Zito C, Cusma-Piccione M, Miceli M, Di Bella G, Mohammed M, Oreto L, Di Matteo I, Crea P, Alongi G, Carerj S, Mizariene V, Zaliaduonyte-Peksiene D, Vaskelyte J, Jonkaitiene R, Jurkevicius R, D'auria F, Stinziani V, Grego S, Polisca P, Chiariello L, Cardoso M, Almeida A, David C, Marques J, Jorge C, Silva D, Magalhaes A, Goncalves S, Diogo A, Shiran A, Adawi S, Sachner R, Asmer I, Ganaeem M, Rubinshtein R, Gaspar T, Necas J, Kovalova S, Bombardini T, Sicari R, Ciampi Q, Gherardi S, Costantino M, Picano E, Casartelli M, Bombardini T, Simion D, Gaspari M, Procaccio F, Tsatsopoulou A, Prappa E, Kalantzi M, Patrianakos A, Anastasakis A, Protonotarios N, Monteforte N, Bloise R, Napolitano C, Priori S, Davos C, Varela A, Tsilafakis C, Kostavassili I, Mavroidis M, Di Molfetta A, Musca F, Fresiello L, Santini L, Forleo G, Lunati M, Ferrari G, Romeo F, Moreo A, Lourenco M, Azevedo O, Machado I, Nogueira I, Fernandes M, Pereira V, Quelhas I, Lourenco A, Estensen M, Langesaeter E, Gullestad L, Aakhus S, Skulstad H, Gronlund C, Gustavsson S, Morner S, Suhr O, Lindqvist P, Sunbul M, Kepez A, Durmus E, Ozben B, Mutlu B, Esposito R, Santoro A, Ippolito R, Schiano Lomoriello V, De Palma D, Santoro C, Muscariello R, Ierano P, Galderisi M, Mohammed M, Zito C, Cusma-Piccione M, Di Bella G, Antonini-Canterin F, Taha N, Di Bello V, Vriz O, Pugliatti P, Carerj S, Beladan C, Popescu B, Calin A, Rosca M, Matei F, Enache E, Gurzun M, Ginghina C, Stanescu C, Manoliu V, Branidou K, Daha I, Baicus C, Adam C, Ene I, Dan G, Von Bibra H, Wulf G, Schuster T, Pfuetzner A, Heilmeyer P, Dobson G, Smith B, Grapsa J, Nihoyannopoulos P, Montoro Lopez M, Alonso Ladreda A, Florez Gomez R, Itziar Soto C, Rios Blanco J, Gemma D, Iniesta Manjavacas A, Moreno Yanguela M, Lopez Sendon J, Guzman Martinez G, O'driscoll J, Marciniak A, Perez-Lopez M, Sharma R, Bombardini T, Cini D, Gherardi S, Del Bene R, Serra W, Moreo A, Sicari R, Picano E, Fernandez Cimadevilla O, De La Hera Galarza J, Pasanisi E, Alvarez Pichel I, Diaz Molina B, Martin Fernandez M, Corros C, Lambert Rodriguez J, Sicari R, Jedrzychowska-Baraniak J, Jarosz K, Jozwa R, Kasprzak J, Mohty D, Petitalot V, El Hamel C, Damy T, Lavergne D, Echahidi N, Virot P, Cogne M, Jaccard A, Weng KP, Hsieh KS, Yang YY, Wutthachusin T, Kaier T, Grapsa J, Morgan D, Hakky S, Purkayastha S, Connolly S, Fox K, Ahmed A, Cousins J, Nihoyannopoulos P, Sveric K, Richter U, Wunderlich C, Strasser R, Spethmann S, Dreger H, Baldenhofer G, Mueller E, Stuuer K, Stangl V, Laule M, Baumann G, Stangl K, Knebel F, Ruiz Ortiz M, Mesa D, Delgado M, Romo E, Castillo F, Morenate M, Baeza F, Toledano F, Leon C, De Lezo JS, Ishizu T, Seo Y, Kameda Y, Enomoto M, Atsumi A, Yamamoto M, Nogami Y, Aonuma K, Theodosis-Georgilas A, Tountas H, Fousteris E, Tsaoussis G, Margetis P, Deligiorgis A, Katidis Z, Melidonis A, Beldekos D, Foussas S, Butz T, Faber L, Piper C, Reckefuss N, Wirdeier S, Van Bracht M, Prull M, Plehn G, Horstkotte D, Trappe HJ, Winter S, Martinek M, Ebner C, Nesser H, Kilickiran Avci B, Yurdakul S, Sahin S, Tanrikulu A, Ermis E, Aytekin S, Cefalu C, Barbier P, Santoro A, Ippolito R, Esposito R, Schiano Lomoriello V, De Palma D, Muscariello R, Galderisi M, Karamanou A, Hamodraka E, Vrakas S, Paraskevaides I, Lekakis I, Kremastinos D, Enache R, Piazza R, Muraru D, Mateescu A, Popescu B, Calin A, Beladan C, Rosca M, Nicolosi G, Ginghina C, Erdogan E, Bacaksiz A, Akkaya M, Tasal A, Vatankulu M, Turfan M, Sonmez O, Ertas G, Uyarel H, Goktekin O, Singelton J, Petraco R, Shaikh R, Cole G, Francis D, Manisty C, Almeida A, Cortez-Dias N, Sousa J, Carpinteiro L, Marques J, Silva D, Jorge C, Carrilho-Ferreira P, Pinto F, Diogo A, Kleczynski P, Legutko J, Rakowski T, Dziewierz A, Siudak Z, Zdzienicka J, Brzozowska-Czarnek A, Dubiel J, Dudek D, Carvalho MS, De Araujo Goncalves P, Dores H, Sousa P, Marques H, Pereira Machado F, Gaspar A, Aleixo A, Mota Carmo M, Roquette J, Obase K, Sakakura T, Matsushita S, Takeuchi M, Tamai S, Komeda M, Yoshida K, Jimenez Rubio C, Isasti Aizpurua G, Miralles Ibarra J, Gianstefani S, Catibog N, Whittaker A, Wathen P, Kogoj P, Reiken J, Monaghan M, Salvetti M, Muiesan M, Paini A, Agabiti Rosei C, Aggiusti C, Bertacchini F, Stassaldi D, Rubagotti G, Comaglio A, Agabiti Rosei E, Soldati E, Corciu A, Zucchelli G, Di Cori A, Segreti L, De Lucia R, Paperini L, Viani S, Vannozzi A, Bongiorni M, Kablak-Ziembicka A, Przewlocki T, Stepien E, Wrotniak L, Karch I, Podolec P, Kleczynski P, Rakowski T, Dziewierz A, Jakala J, Legutko J, Dubiel J, Dudek D. Poster session Friday 7 December - PM: Effect of systemic illnesses on the heart. Eur Heart J Cardiovasc Imaging 2012. [DOI: 10.1093/ehjci/jes266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Lakhal-Naouar I, Jardim A, Strasser R, Luo S, Kozakai Y, Nakhasi HL, Duncan RC. Leishmania donovani argininosuccinate synthase is an active enzyme associated with parasite pathogenesis. PLoS Negl Trop Dis 2012; 6:e1849. [PMID: 23094117 PMCID: PMC3475689 DOI: 10.1371/journal.pntd.0001849] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [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: 02/03/2012] [Accepted: 08/22/2012] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Gene expression analysis in Leishmania donovani (Ld) identified an orthologue of the urea cycle enzyme, argininosuccinate synthase (LdASS), that was more abundantly expressed in amastigotes than in promastigotes. In order to characterize in detail this newly identified protein in Leishmania, we determined its enzymatic activity, subcellular localization in the parasite and affect on virulence in vivo. METHODOLOGY/PRINCIPAL FINDINGS Two parasite cell lines either over expressing wild type LdASS or a mutant form (G128S) associated with severe cases of citrullinemia in humans were developed. In addition we also produced bacterially expressed recombinant forms of the same proteins. Our results demonstrated that LdASS has argininosuccinate synthase enzymatic activity that is abolished using an ASS specific inhibitor (MDLA: methyl-D-L-Aspartic acid). However, the mutant form of the protein is inactive. We demonstrate that though LdASS has a glycosomal targeting signal that binds the targeting apparatus in vitro, only a small proportion of the total cellular ASS is localized in a vesicle, as indicated by protection from protease digestion of the crude organelle fraction. The majority of LdASS was found to be in the cytosolic fraction that may include large cytosolic complexes as indicated by the punctate distribution in IFA. Surprisingly, comparison to known glycosomal proteins by IFA revealed that LdASS was located in a structure different from the known glycosomal vesicles. Significantly, parasites expressing a mutant form of LdASS associated with a loss of in vitro activity had reduced virulence in vivo in BALB/c mice as demonstrated by a significant reduction in the parasite load in spleen and liver. CONCLUSION/SIGNIFICANCE Our study suggests that LdASS is an active enzyme, with unique localization and essential for parasite survival and growth in the mammalian host. Based on these observations LdASS could be further explored as a potential drug target.
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Affiliation(s)
- Ines Lakhal-Naouar
- Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research (CBER), Food and Drug Administration (FDA), Bethesda, Maryland, United States of America
| | - Armando Jardim
- Institute of Parasitology, McGill University and the Centre for Host-Parasite Interactions, Quebec, Canada
| | - Rona Strasser
- Institute of Parasitology, McGill University and the Centre for Host-Parasite Interactions, Quebec, Canada
| | - Shen Luo
- Laboratory of Chemistry, Division of Therapeutic Proteins, Center for Drug Evaluation and Research (CDER), Food and Drug Administration (FDA), Bethesda, Maryland, United States of America
| | - Yukiko Kozakai
- Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research (CBER), Food and Drug Administration (FDA), Bethesda, Maryland, United States of America
| | - Hira L. Nakhasi
- Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research (CBER), Food and Drug Administration (FDA), Bethesda, Maryland, United States of America
| | - Robert C. Duncan
- Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research (CBER), Food and Drug Administration (FDA), Bethesda, Maryland, United States of America
- * E-mail:
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Boitz JM, Strasser R, Hartman CU, Jardim A, Ullman B. Adenine aminohydrolase from Leishmania donovani: unique enzyme in parasite purine metabolism. J Biol Chem 2012; 287:7626-39. [PMID: 22238346 DOI: 10.1074/jbc.m111.307884] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Adenine aminohydrolase (AAH) is an enzyme that is not present in mammalian cells and is found exclusively in Leishmania among the protozoan parasites that infect humans. AAH plays a paramount role in purine metabolism in this genus by steering 6-aminopurines into 6-oxypurines. Leishmania donovani AAH is 38 and 23% identical to Saccharomyces cerevisiae AAH and human adenosine deaminase enzymes, respectively, catalyzes adenine deamination to hypoxanthine with an apparent K(m) of 15.4 μM, and does not recognize adenosine as a substrate. Western blot analysis established that AAH is expressed in both life cycle stages of L. donovani, whereas subcellular fractionation and immunofluorescence studies confirmed that AAH is localized to the parasite cytosol. Deletion of the AAH locus in intact parasites established that AAH is not an essential gene and that Δaah cells are capable of salvaging the same range of purine nucleobases and nucleosides as wild type L. donovani. The Δaah null mutant was able to infect murine macrophages in vitro and in mice, although the parasite loads in both model systems were modestly reduced compared with wild type infections. The Δaah lesion was also introduced into a conditionally lethal Δhgprt/Δxprt mutant in which viability was dependent on pharmacologic ablation of AAH by 2'-deoxycoformycin. The Δaah/Δhgprt/Δxprt triple knock-out no longer required 2'-deoxycoformycin for growth and was avirulent in mice with no persistence after a 4-week infection. These genetic studies underscore the paramount importance of AAH to purine salvage by L. donovani.
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Affiliation(s)
- Jan M Boitz
- Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, Oregon 97239, USA
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Gong L, Ye Z, Zeng Z, Xia M, Zhong Y, Yao Y, Lee E, Ionescu A, Dwivedi G, Mahadevan G, Jiminez D, Frenneaux M, Steeds R, Moore C, Samad Z, Jackson K, Castellucci J, Kisslo J, Von Ramm O, D'ascenzi F, Zaca' V, Cameli M, Lisi M, Natali B, Malandrino A, Mondillo S, Barbier P, Guerrini U, Franzosi M, Castiglioni L, Nobili E, Colazzo F, Li Causi T, Sironi L, Tremoli E, Clausen H, Macdonald S, Basaggianis C, Newton J, Cameli M, Lisi M, Bennati E, Reccia R, Malandrino A, Bigio E, Maccherini M, Chiavarelli M, Henein M, Mondillo S, Floria M, Jamart J, Arsenescu Georgescu C, Mantovani F, Barbieri A, Bursi F, Valenti C, Quaglia M, Modena M, Kutty S, Gribben P, Padiyath A, Polak A, Scott C, Waiss M, Danford D, Bech-Hanssen O, Selimovic N, Rundqvist B, Schmiedel L, Hohmann C, Katzke S, Haacke K, Rauwolf T, Strasser R, Tumasyan LR, Adamyan K, Kosmala W, Derzhko R, Przewlocka-Kosmala M, Mysiak A, Stachowska B, Jedrzejuk D, Bednarek-Tupikowska G, Chrzanowski L, Kasprzak J, Wojciechowska C, Wita K, Busz-Papiez B, Gasior Z, Mizia-Stec K, Kukulski T, Gosciniak P, Sinkiewicz W, Moelmen H, Stoylen A, Thorstensen A, Torp H, Dalen H, Groves A, Nicholson G, Lopez L, Goh CW, Ahn H, Byun Y, Kim J, Park J, Lee J, Park J, Kim B, Rhee K, Kim K, Park J, Yoon H, Hong Y, Park H, Kim J, Ahn Y, Jeong M, Cho J, Kang J, Grapsa J, Dawson D, Karfopoulos K, Jakaj G, Punjabi P, Nihoyannopoulos P, Ruisanchez Villar C, Lerena Saenz P, Gonzalez Vilchez F, Gonzalez Fernandez C, Zurbano Goni F, Cifrian Martinez J, Mons Lera R, Ruano Calvo J, Martin Duran R, Vazquez De Prada Tiffe J, Pietrzak R, Werner B, Voillot D, Huttin O, Zinzius P, Schwartz J, Sellal J, Lemoine S, Christophe C, Popovic B, Juilliere Y, Selton-Suty C, Ishii K, Furukawa A, Nagai T, Kataoka K, Seino Y, Shimada K, Yoshikawa J, Tekkesin A, Yildirimturk O, Tayyareci Y, Yurdakul S, Aytekin S, Jaroch J, Loboz-Grudzien K, Bociaga Z, Kowalska A, Kruszynska E, Wilczynska M, Dudek K, Kakihara R, Naruse C, Hironaka H, Tsuzuku T, Cucchini U, Muraru D, Badano L, Solda' E, Tuveri M, Al Nono O, Sarais C, Iliceto S, Santos L, Cortez-Dias N, Ribeiro S, Goncalves S, Jorge C, Carrilho-Ferreira P, Silva D, Silva-Marques J, Lopes M, Diogo A, Hristova K, Vassilev D, Pavlov P, Katova T, Simova I, Kostova V, Esposito R, Santoro A, Schiano Lomoriello V, Raia R, De Palma D, Dores E, De Simone G, Galderisi M, Zaborska B, Makowska E, Pilichowska E, Maciejewski P, Bednarz B, Wasek W, Stec S, Budaj A, Spinelli L, Morisco C, Assante Di Panzillo E, Crispo S, Di Marino S, Trimarco B, Santoro A, Schiano Lomoriello V, Esposito R, Farina F, Innelli P, Rapacciuolo A, Galderisi M, Polgar B, Banyai F, Rokusz L, Tomcsanyi I, Vaszily M, Nieszner E, Borsanyi T, Kerecsen G, Preda I, Kiss RG, Bull S, Suttie J, Augustine D, Francis J, Karamitsos T, Becher H, Prendergast B, Neubauer S, Myerson S, Lodge F, Broyd C, Milton P, Mikhail G, Mayet J, Davies J, Francis D, Clavel MA, Ennezat PV, Marechaux S, Dumesnil J, Bellouin A, Bergeron S, Meimoun P, Le Tourneau T, Pasquet A, Pibarot P, Herrmann S, Stoerk S, Niemann M, Hu K, Voelker W, Ertl G, Weidemann F, Tayyareci Y, Yurdakul S, Yildirimturk O, Aytekin V, Aytekin S, Kogoj P, Ambrozic J, Bunc M, Di Salvo G, Rea A, Castaldi B, Gala S, D'aiello A, Mormile A, Pisacane F, Pacileo G, Russo M, Calabro R, Nguyen L, Ricksten SE, Jeppsson A, Schersten H, Bech-Hanssen O, Boerlage-Van Dijk K, Yong Z, Bouma B, Koch K, Vis M, Piek J, Baan J, Scandura S, Ussia G, Caggegi A, Cammalleri V, Sarkar K, Mangiafico S, Chiaranda' M, Imme' S, Pistritto A, Tamburino C, Ring L, Nair S, Wells F, Shapiro L, Rusk R, Rana B, Madrid Marcano G, Solis Martin J, Gonzalez Mansilla A, Bravo L, Menarguez Palanca C, Munoz P, Bouza E, Yotti R, Bermejo Thomas J, Fernandez Aviles F, Tamayo T, Denes M, Balint O, Csepregi A, Csillik A, Erdei T, Temesvari A, Fernandez-Pastor J, Linde-Estrella A, Cabrera-Bueno F, Pena-Hernandez J, Barrera-Cordero A, Alzueta-Rodriguez F, De Teresa-Galvan E, Merlo M, Pinamonti M, Finocchiaro G, Pyxaras S, Barbati G, Buiatti A, Dilenarda A, Sinagra G, Kuperstein R, Freimark D, Hirsch S, Feinberg M, Arad M, Mitroi C, Garcia Lunar I, Monivas Palomero V, Mingo Santos S, Beltran Correas P, Gonzalez Lopez E, Garcia Pavia P, Gonzalez Mirelis J, Cavero Gibanel M, Alonso Pulpon L, Finocchiaro G, Pinamonti B, Merlo M, Barbati G, Dilenarda A, Sinagra G, Zaidi A, Ghani S, Sheikh N, Gati S, Howes R, Sharma R, Sharma S, Calcagnino M, O'mahony C, Coats C, Cardona M, Garcia A, Murphy E, Lachmann R, Mehta A, Hughes D, Elliott P, Di Bella G, Madaffari A, Donato R, Mazzeo A, Casale M, Zito C, Vita G, Carerj S, Marek D, Indrakova J, Rusinakova Z, Skala T, Kocianova E, Taborsky M, Musca F, De Chiara B, Belli O, Cataldo S, Brunati C, Colussi G, Quattrocchi G, Santambrogio G, Spano F, Moreo A, Rustad L, Nytroen K, Gullestad L, Amundsen B, Aakhus S, Maroz-Vadalazhskaya N, Shumavetc V, Kurganovich S, Seljun Y, Ostrovskiy A, Ostrovskiy Y, Rustad L, Nytroen K, Segers P, Amundsen B, Aakhus S, Przewlocka-Kosmala M, 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Chioccioli M, Del Meglio J, Casolo G, Kuznetsov VA, Melnikov NN, Krinochkin DV, Calin A, Enache R, Popescu B, Beladan C, Rosca M, Lupascu L, Purcarea F, Calin C, Gurzun M, Ginghina C, Dulgheru R, Ciobanu A, Magda S, Mihaila S, Rimbas R, Margulescu A, Cinteza M, Vinereanu D, Sumin AN, Arhipov O, Yoon J, Moon J, Rim S, Nyktari E, Patrianakos A, Solidakis G, Psathakis E, Parthenakis F, Vardas P, Kordybach M, Kowalski M, Kowalik E, Hoffman P, Nagy KV, Kutyifa V, Edes E, Apor A, Merkely B, Gerlach A, Rost C, Schmid M, Rost M, Flachskampf F, Daniel W, Breithardt O, Altekin E, Karakas S, Yanikoglu A, Er A, Baktir A, Demir I, Deger N, Klitsie L, Hazekamp M, Roest A, Van Der Hulst A, Gesink- Van Der Veer B, Kuipers I, Blom N, Ten Harkel A, Farsalinos K, Tsiapras D, Kyrzopoulos S, Avramidou E, Vasilopoulou D, Voudris V, Werner B, Florianczyk T, Ivanovic B, Tadic M, Kalinowski M, Szulik M, Streb W, Rybus-Kalinowska B, Sliwinska A, Stabryla J, Kukla M, Nowak J, Kukulski T, Kalarus Z, Florescu M, 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Elsheekh N. Poster Session 5: Saturday 10 December 2011, 08:30-12:30 * Location: Poster Area. European Journal of Echocardiography 2011. [DOI: 10.1093/ejechocard/jer218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Pabst M, Grass J, Toegel S, Liebminger E, Strasser R, Altmann F. Isomeric analysis of oligomannosidic N-glycans and their dolichol-linked precursors. Glycobiology 2011; 22:389-99. [DOI: 10.1093/glycob/cwr138] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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Schuchardt M, Toelle M, Huang T, Wiedon A, Van Der Giet M, Mill C, George S, Jeremy J, Santulli G, Illario M, Cipolletta E, Sorriento D, Del Giudice C, Anastasio A, Trimarco B, Iaccarino G, Jobs A, Wagner C, Kurtz A, De Wit C, Koller A, Suvorava T, Weber M, Dao V, Kojda G, Tsaousi A, Lyon C, Williams H, George S, Barth N, Loot A, Fleming I, Keul P, Lucke S, Graeler M, Heusch G, Levkau B, Biessen E, De Jager S, Bermudez-Pulgarin B, Bot I, Abia R, Van Berkel T, Renger A, Noack C, Zafiriou M, Dietz R, Bergmann M, Zelarayan L, Hammond J, Hamelet J, Van Assche T, Belge C, Vanderper A, Langin D, Herijgers P, Balligand J, Perrot A, Neubert M, Dietz R, Posch M, Oezcelik C, Posch M, Waldmuller S, Perrot A, Berger F, Scheffold T, Bouvagnet P, Ozcelik C, Lebreiro A, Martins E, Lourenco P, Cruz C, Martins M, Bettencourt P, Maciel M, Abreu-Lima C, Pilichou K, Bauce B, Rampazzo A, Carturan E, Corrado D, Thiene G, Basso C, Piccini I, Fortmueller L, Kuhlmann M, Schaefers M, Carmeliet P, Kirchhof P, 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Y, Ma Y, Yang Y, Liu F, Chen B, Li X, Houston-Feenstra L, Chiong JR, Jutzy K, Furundzija V, Kaufmann J, Kappert K, Meyborg H, Fleck E, Stawowy P, Ksiezycka-Majczynska E, Lubiszewska B, Kruk M, Kurjata P, Ruzyllo W, Ibatov A, Driesen R, Coenen T, Fagard R, Sipido K, Petrov V, Aksentijevic D, Lygate C, Makinen K, Sebag-Montefiore L, Medway D, Schneider J, Neubauer S, Gasser R, Holzwart E, Rainer P, Von Lewinski D, Maechler H, Gasser S, Roessl U, Pieske B, Krueger J, Kintscher U, Kappert K, Podramagi T, Paju K, Piirsoo A, Roosimaa M, Kadaja L, Orlova E, Ruusalepp A, Seppet E, Auquier J, Ginion A, Hue L, Horman S, Beauloye C, Vanoverschelde J, Bertrand L, Fekete V, Zvara A, Pipis J, Konya C, Csonka C, Puskas L, Csont T, Ferdinandy P, Gasser S, Rainer P, Holzwart E, Roessl U, Kraigher-Krainer E, Von Lewinksi D, Pieske B, Gasser R, Gonzalez-Loyola A, Barba I, Rodriguez-Sinovas A, Fernandez-Sanz C, Agullo E, Ruiz-Meana M, Garcia-Dorado D, Forteza M, Bodi Peris V, Monleon D, Mainar L, Morales J, Moratal D, Trapero I, Chorro F, Leszek P, Sochanowicz B, Szperl M, Kolsut P, Piotrowski W, Rywik T, Danko B, Kruszewski M, Stanley W, Khairallah R, Khanna N, O'shea K, Kristian T, Hecker P, Des Rosiers R, Fiskum G, Fernandez-Alfonso M, Guzman-Ruiz R, Somoza B, Gil-Ortega M, Attane C, Castan-Laurell I, Valet P, Ruiz-Gayo M, Maroz-Vadalazhskaya N, Denissevich T, Shumavetz V, Ostrovskiy Y, Schrepper A, Schwarzer M, Amorim P, Schoepe M, Mohr F, Doenst T, Chiellini G, Ghelardoni S, Saba A, Marchini M, Frascarelli S, Raffaelli A, Scanlan T, Zucchi R, Van Den Akker N, Molin D, Kolk F, Jeukens F, Olde Engberink R, Waltenberger J, Post M, Van Den Akker N, Molin D, Verbruggen S, Schulten H, Post M, Waltenberger J, Rochais F, Kelly R, Aberg M, Johnell M, Wickstrom M, Siegbahn A, Dimitrakis P, Groppalli V, Ott D, Seifriz F, Suter T, Zuppinger C, Kashcheyeu Y, Mueller R, Wiesen M, Saric T, Gruendemann D, Hescheler J, Herzig S, Falcao-Pires I, Fontes-Sousa A, Lopes-Conceicao L, Bras-Silva C, Leite-Moreira A, Bukauskas F, Palacios-Prado N, Norheim F, Raastad T, Thiede B, Drevon C, Haugen F, Lindner D, Westermann D, Zietsch C, Schultheiss HP, Tschoepe C, Horn M, Graham H, Hall M, Richards M, Clarke J, Dibb K, Trafford A, Cheng CF, Lin H, Eigeldiger-Berthou S, Buntschu P, Frobert A, Flueck M, Tevaearai H, Kadner A, Mikhailov A, Torrado M, Centeno A, Lopez E, Lourido L, Castro Beiras A, Popov T, Srdanovic I, Petrovic M, Canji T, Kovacevic M, Jovelic A, Sladojevic M, Panic G, Kararigas G, Fliegner D, Regitz-Zagrosek V, De La Rosa Sanchez A, Dominguez J, Sedmera D, Franco D, Aranega A, Medunjanin S, Burgbacher F, Schmeisser A, Strasser R, Braun-Dullaeus R, Li X, Ma Y, Yang Y, Liu F, Han W, Chen B, Zhang J, Gao X, Bayliss C, Song W, Stuckey D, Dyer E, Leung MC, Monserrat L, Marston S, Sorriento D, Santulli G, Fusco A, Trimarco B, Iaccarino G, Revnic C, Ginghina C, Revnic F, Paillard M, Liang J, Strub G, Gomez L, Hait N, Allegood J, Lesnefsky E, Spiegel S, Zuchi C, Coiro S, Bettini M, Ciliberti G, Mancini I, Tritto I, Becker L, Ambrosio G, Adam T, Sharp S, Opie L, Lecour S, Khaliulin I, Parker J, Halestrap A, Kandasamy A, Schulz R, Schoepe M, Schwarzer M, Schrepper A, Osterholt M, Amorim P, Mohr F, Doenst T, Fernandez-Sanz C, Ruiz-Meana M, Miro-Casas E, Agullo E, Boengler K, Schulz R, Garcia-Dorado D, Menazza S, Canton M, Sheeran F, Di Lisa F, Pepe S, Borchi E, Manni M, Bargelli V, Giordano C, D'amati G, Cerbai E, Nediani C, Raimondi L, Micova P, Balkova P, Kolar F, Neckar J, Novak F, Novakova O, Schuchardt M, Toelle M, Pruefer N, Pruefer J, Jankowski V, Jankowski J, Van Der Giet M, Han W, Su Y, Zervou S, Aksentijevic D, Lygate C, Neubauer S, Seidel B, Korkmaz S, Radovits T, Hirschberg K, Loganathan S, Barnucz E, Karck M, Szabo G, Aggeli I, Kefaloyianni E, Beis I, Gaitanaki C, Lacerda L, Somers S, Opie L, Lecour S, Brack K, Coote J, Ng G, Paur H, Nikolaev V, Lyon A, Harding S, Bras-Silva C. Sunday, 18 July 2010. Cardiovasc Res 2010. [DOI: 10.1093/cvr/cvq176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Cyr N, Madrid KP, Strasser R, Aurousseau M, Finn R, Ausio J, Jardim A. Leishmania donovani peroxin 14 undergoes a marked conformational change following association with peroxin 5. J Biol Chem 2008; 283:31488-99. [PMID: 18718908 DOI: 10.1074/jbc.m803529200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The import of PTS1 proteins into the glycosome or peroxisome requires binding of a PTS1-laden PEX5 receptor to the membrane-associated protein PEX14 to facilitate translocation of PTS1 proteins into the lumen of these organelles. Quaternary structure analysis of protozoan parasite Leishmania donovani PEX14 (LdPEX14) revealed that this protein forms a homomeric complex with a size > 670 kDa. Moreover, deletion mapping indicated that disruption of LdPEX14 oligomerization correlated with the elimination of the hydrophobic region and coiled-coil motif present in LdPEX14. Analysis of the LdPEX5-LdPEX14 interaction by isothermal titration calorimetry revealed a molar binding stoichiometry of 1:4 (LdPEX5: LdPEX14) and an in-solution dissociation constant (K(d)) of approximately 74 nm. Calorimetry, circular dichroism, intrinsic fluorescence, and analytical ultracentrifugation experiments showed that binding of LdPEX5 resulted in a dramatic conformational change in the LdPEX14 oligomeric complex that involved the reorganization of the hydrophobic segment in LdPEX14. Finally, limited tryptic proteolysis assays established that in the presence of LdPEX5, LdPEX14 became more susceptible to proteolytic degradation consistent with this protein interaction triggering a significant conformational change in the recombinant and native LdPEX14 structures. These structural changes provide essential clues to how LdPEX14 functions in the translocation of folded proteins across the glycosomal membrane.
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Affiliation(s)
- Normand Cyr
- Institute of Parasitology, Macdonald Campus of McGill University, Ste-Anne-de-Bellevue, Québec H9X 3V9
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Simonis G, Schmeißer A, Strasser R. Familienanamnese vor Neuverordnung einer oralen Kontrazeption: altmodisch, aber immer noch wertvoll. Dtsch Med Wochenschr 2007; 132:2327-9. [DOI: 10.1055/s-2007-991651] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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van Bergen B, Strasser R, Cyr N, Sheppard JD, Jardim A. α,β-dicarbonyl reduction by Saccharomyces d-arabinose dehydrogenase. Biochim Biophys Acta Gen Subj 2006; 1760:1636-45. [PMID: 17030441 DOI: 10.1016/j.bbagen.2006.08.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Revised: 08/23/2006] [Accepted: 08/23/2006] [Indexed: 11/19/2022]
Abstract
An alpha,beta-dicarbonyl reductase activity was purified from Saccharomyces cerevisiae and identified as the cytosolic enzyme D-Arabinose dehydrogenase (ARA1) by MALDI-TOF/TOF. Size exclusion chromatography analysis of recombinant Ara1p revealed that this protein formed a homodimer. Ara1p catalyzed the reduction of the reactive alpha,beta-dicarbonyl compounds methylglyoxal, diacetyl, and pentanedione in a NADPH dependant manner. Ara1p had apparent Km values of approximately 14 mM, 7 mM and 4 mM for methylglyoxal, diacetyl and pentanedione respectively, with corresponding turnover rates of 4.4, 6.9 and 5.9 s(-1) at pH 7.0. pH profiling showed that Ara1p had a pH optimum of 4.5 for the diacetyl reduction reaction. Ara1p also catalyzed the NADP+ dependant oxidation of acetoin; however this back reaction only occurred at alkaline pH values. That Ara1p was important for degradation of alpha,beta-dicarbonyl substrates was further supported by the observation that ara1-Delta knockout yeast mutants exhibited a decreased growth rate phenotype in media containing diacetyl.
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Affiliation(s)
- Barry van Bergen
- Department of Bioresource Engineering, Macdonald Campus of McGill University, 21 111 Lakeshore Road, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9
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Harig F, Meier C, Hakami L, Strasser R, Bretzger J, Münch F, Vestweber-Wilmes E, Singer H, Weyand M, Cesnjevar R. Does the Additional Use of Heparin-Coated Extracorporeal Circuits (ECC) Optimize the Effect of Modified Ultrafiltration (MUF) in Pediatric Perfusion? Thorac Cardiovasc Surg 2006; 54:168-72. [PMID: 16639677 DOI: 10.1055/s-2005-872863] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND Modified ultrafiltration (MUF) has been shown to exert beneficial effects on the coagulation system and the capillary leak after pediatric cardiac surgery using extracorporeal circulation (ECC). The aim of this study was to investigate whether the additional use of heparin-coated circuits is a useful option for improving biocompatibility. METHODS We randomized 28 children, using heparin-coated ECC circuits in group A (n = 14) and an uncoated equivalent set in group B (n = 14). After congenital heart surgery, MUF was performed post ECC in a standardized fashion. Blood samples were analyzed preoperatively, 10 min, 30 min, 1 h, and 48 h after ECC by flow cytometric analysis (FACSort) using surface antigens CD62/CD41b (platelets) and CD45/CD14 (monocytes). RESULTS No significant difference was found with respect to mean age (20.6 months vs. 21.6 months), mean body weight (9.2 kg vs. 8.4 kg), mean ultrafiltration rate (9.1 ml/kg vs. 11.4 ml/kg), chest tube drainage, blood products, ICU stay, and 30-d survival. The percentage of CD62/CD41-positive platelets in group A (vs. B) increased up to 118 % at 60 min vs. 130 % ( P < 0.05) and declined to 98 % at 48 h postop. vs. 99 % (n. s.). The percentage of CD45/CD14-positive monocytes in group A (vs. B) increased up to 158 % at 60 min vs. 155 % (n. s.) and declined to 122 % (A) at 48 h postop. vs. 61 % (B) ( P > 0.05). CONCLUSIONS Heparin coating of ECC in addition to MUF leads to a lower platelet activation. Monocyte surface markers CD45 and CD14 indicated a marked activation during ECC in both groups but additional heparin coating showed a better postoperative regeneration of monocyte markers in the late course indicating a beneficial additive effect.
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Affiliation(s)
- F Harig
- Center of Cardiac Surgery, University Hospital Erlangen, Erlangen, Germany.
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Tesson G, Strasser R, Pong RW, Curran V. Advances in rural medical education in three countries: Canada, The United States and Australia. Rural Remote Health 2005; 5:397. [PMID: 16283826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023] Open
Abstract
INTRODUCTION This article documents a number of rural medical education initiatives in Australia, Canada and the United States. A typology is created reflecting the centrality the rural mandate and characterizing different features of each school's program. Interviews with school officials are drawn on to reflect the challenges these schools face. METHOD Seven schools noted for their rural programs were selected from the three countries and interviews were conducted with senior officials. The interview data was supplemented by published material on the schools. RESULTS The Typology: Three kinds of school are distinguished: Mixed Urban/Rural Schools (University of Washington, US, the University of British Columbia, Canada, and Flinders University, Australia); DeFacto Rural Schools (University of New Mexico, US and Memorial University, Canada) and Stand Alone Rural Schools (James Cook University, Australia and the Northern Ontario School of Medicine, Canada). The Pipeline Approach: All of the schools adopted in varying degrees a pipeline approach to meeting the need for rural doctors focusing on: (a) early recruitment; (b) admissions; (c) locating clinical education in rural settings; (d) rural health focus to curriculum; and (e) support for rural practice. CONCLUSION The analysis does not strongly favor one model over others, although the Stand-Alone Rural schools had more opportunities to adopt innovative curricula reflecting rural health issues and to foster positive views of rural practice. Government funding targeting rural health needs will remain critical in the development of all these programs.
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Affiliation(s)
- G Tesson
- Centre for Rural and Northern Health Research, Laurentian University, Sudbury, Ontario, Canada.
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Eggert K, Odin P, Gasser T, Meinertz T, Strasser R, Osterspey A, Deuschl G, Oertel WH. Herzklappenerkrankungen und andere fibrotische Reaktionen als Nebenwirkung von Dopaminagonisten: Klinische Konsequenzen beim jetzigen Stand der Erkenntnisse. Akt Neurol 2005. [DOI: 10.1055/s-2004-834683] [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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Weber N, Einsle F, Nitschke M, Strasser R, Joraschky P. Die Bedeutung der Typ D-Persönlichkeit (TypD) bei Patienten mit thorakalen Schmerzen. Psychother Psychosom Med Psychol 2005. [DOI: 10.1055/s-2005-863578] [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: 10/26/2022]
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Worley P, Strasser R, Prideaux D. Can medical students learn specialist disciplines based in rural practice: lessons from students' self reported experience and competence. Rural Remote Health 2004; 4:338. [PMID: 15887993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
INTRODUCTION Medical schools in Australia are being funded by the Commonwealth Government Department of Health and Aging to move a considerable amount of undergraduate clinical education into rural and remote settings. There are concerns that these students may be disadvantaged in terms of exposure to appropriate clinical learning opportunities. This study compared learning opportunities for students undertaking an entire clinical year based in a rural primary care setting, a remote secondary hospital, or a traditional urban tertiary teaching hospital. METHODS Twenty-nine students, six from rural primary care, eight from the remote secondary hospital, and 15 from the urban tertiary teaching hospital, completed a retrospective survey of their experience and perceived competence to manage 78 common procedural skills and 62 common conditions. RESULTS Students in rural primary care reported a pattern of increased clinical exposure to common clinical conditions and procedures in comparison with their hospital-based peers. In comparing the two hospital-based programs, the students in the remote secondary care hospital reported increased exposure to common conditions and no significant difference in the opportunity to undertake common procedures. The data also demonstrated that there was a positive correlation between reported experience and self-perceived competence, and that this was greater for procedural skills than competence in managing common conditions. CONCLUSIONS This study provides further evidence that rural primary care is an excellent setting for high quality clinical and educational experiences. These findings should serve to encourage students and staff involved with the new Rural Clinical School programs.
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Affiliation(s)
- P Worley
- Flinders University, Adelaide, South Australia, Australia.
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Strasser R, Altmann F, Mach L, Glössl J, Steinkellner H. Generation of Arabidopsis thaliana plants with complex N-glycans lacking beta1,2-linked xylose and core alpha1,3-linked fucose. FEBS Lett 2004; 561:132-6. [PMID: 15013764 DOI: 10.1016/s0014-5793(04)00150-4] [Citation(s) in RCA: 220] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2004] [Accepted: 01/26/2004] [Indexed: 10/26/2022]
Abstract
The plant glycosyltransferases, beta1,2-xylosyltransferase (XylT) and core alpha1,3-fucosyltransferase (FucT), are responsible for the transfer of beta1,2-linked xylose and core alpha1,3-linked fucose residues to glycoprotein N-glycans. These glycan epitopes are not present in humans and thus may cause immunological responses, which represent a limitation for the therapeutic use of recombinant mammalian glycoproteins produced in transgenic plants. Here we report the genetic modification of the N-glycosylation pathway in Arabidopsis thaliana plants. Knockout plants were generated with complete deficiency of XylT and FucT. These plants lack antigenic protein-bound N-glycans and instead synthesise predominantly structures with two terminal betaN-acetylglucosamine residues (GlcNAc(2)Man(3)GlcNAc(2)).
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Affiliation(s)
- R Strasser
- Institut für Angewandte Genetik und Zellbiologie, Universität für Bodenkultur Wien, Muthgasse 18, A-1190 Wien, Austria.
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Einsle F, Köllner V, Ende C, Neumann K, Strasser R, Maercker A. Fragebogeninstrument zur Erfassung von Anpassungsstörungen–erste Ergebnisse. Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-822483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Einsle F, Maercker A, Neumann K, Ende C, Strasser R, Köllner V. Anpassungsstörungen bei Patienten mit Herzrhythmusstörungen. Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-822484] [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: 10/18/2022]
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Einsle F, Köllner V, Ende C, Neumann K, Strasser R, Maercker A. Fragebogeninstrument zur Erfassung von Anpassungsstörungen–erste Ergebnisse. Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-819788] [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: 10/18/2022]
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Neumann K, Einsle F, Nitschke M, Strasser R, Köllner V. Wie beeinflusst Amiodaron die Lebensqualität und psychische Befindlichkeit von Patienten mit Herzrhythmusstörungen? Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-822539] [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: 10/18/2022]
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Ende C, Einsle F, Priem S, Strasser R, Köllner V. Unterschiede in der Herzangst von Patienten mit Herzschrittmachern und Patienten mit einem AICD. Psychother Psych Med 2004. [DOI: 10.1055/s-2004-822485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Neumann K, Einsle F, Nitschke M, Strasser R, Köllner V. Wie beeinflusst Amiodaron die Lebensqualität und psychische Befindlichkeit von Patienten mit Herzrhythmusstörungen? Psychother Psych Med 2004. [DOI: 10.1055/s-2004-819844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Einsle F, Maercker A, Neumann K, Ende C, Strasser R, Köllner V. Anpassungsstörungen bei Patienten mit Herzrhythmusstörungen. Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-819789] [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: 10/18/2022]
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Einsle F, Köllner V, Nitschke M, Strasser R, Joraschky P. Erleben und Befindlichkeit von Patienten nach Evakuierung des Dresdner Herzzentrums während der Flutkatastrophe 2002. Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-819787] [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: 10/18/2022]
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Einsle F, Köllner V, Nitschke M, Strasser R, Joraschky P. Erleben und Befindlichkeit von Patienten nach Evakuierung des Dresdner Herzzentrums während der Flutkatastrophe 2002. Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-822482] [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: 10/18/2022]
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Ende C, Einsle F, Priem S, Strasser R, Köllner V. Unterschiede in der Herzangst von Patienten mit Herzschrittmachern und Patienten mit einem AICD. Psychother Psychosom Med Psychol 2004. [DOI: 10.1055/s-2004-819790] [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: 10/18/2022]
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Goltsev V, Zaharieva I, Lambrev P, Yordanov I, Strasser R. Simultaneous analysis of prompt and delayed chlorophyll a fluorescence in leaves during the induction period of dark to light adaptation. J Theor Biol 2003; 225:171-83. [PMID: 14575651 DOI: 10.1016/s0022-5193(03)00236-4] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
An attempt is made to reveal the relation between the induction curves of delayed fluorescence (DF) registered at 0.35-5.5 ms and the prompt chlorophyll fluorescence (PF). A simple formulation was proposed to link the ratio of the transient values of delayed and variable fluorescence with the redox state of the primary electron acceptor of Photosystem II--QA, and the thylakoid membrane energization. The term luminescence potential (UL) was introduced, defined as the sum of the redox potential of QA and the transmembrane proton gradient. It was shown that UL is proportional to the ratio of DF to the variable part of PF. The theoretical model was verified and demonstrated by analysing induction courses of PF and millisecond DF, simultaneously registered from leaves of barley--wild-type and the chlorophyll b-less mutant chlorina f2. A definitive correlation between PF and DF was established. If the luminescence changes are strictly due to UL, the courses of DF and PF are reciprocal and the millisecond DF curve resembles the first derivative of the PFt function.
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Affiliation(s)
- V Goltsev
- Department of Biophysics and Radiobiology, Faculty of Biology, St. Kliment Ohridski University of Sofia, 8, Dragan Tzankov Blvd., 1164, Sofia, Bulgaria.
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Abstract
An expert panel of female rural and remote doctors have nominated updating professional skills as the most important strategy for sustainable rural general practice for women. The panel was comprised of members of the Australian College of Rural and Remote Medicine (ACRRM). The panel was asked to identify and prioritise strategies they had used to make rural practice work for them. They identified and ranked the following eight groups of strategies: (i) structure medical practice to work for you; (ii) implement personal strategies; (iii) obtain and update professional skills; (iv) establish professional and personal boundaries; (v) gain exposure to rural practice; (vi) engage with the community; (vii) implement professional strategies; and (viii) engage with women. Detailed strategies within these groups have been identified and will form the basis of grounded knowledge about how to structure rural and remote practice to work for women. This will complement the work of ACRRM, the Rural Doctors Association and workforce agencies in developing models of sustainable rural medical practice.
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Affiliation(s)
- J Wainer
- Monash University School of Rural Health, Box 424 Traralgon, Victoria 3844, Australia.
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Somers GT, Young AE, Strasser R. Rural career choice issues as reported by first year medical students and rural general practitioners. Aust J Rural Health 2001; 9 Suppl 1:S6-13. [PMID: 11998278 DOI: 10.1046/j.1440-1584.9.s1.5.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Governments have recently instituted several programmes designed to attract medical students to rural practice. Questions may be raised as to whether interventions based around issues identified as important to practising rural general practitioners (GPs) are equally applicable to undergraduate medical students. The results of two studies on the importance of personal and practice issues as ascribed by Australian rural GPs and Victorian medical students are analysed. The effect of the students' gender, place of origin and intended location of practice is assessed. Findings suggest that practising GPs may have resolved many of the student issues and may be well placed to advise students on perceived hurdles to rural practice. Furthermore, students may be seeking a practice style similar to that sought by female GPs. The present paper concludes that while there are similarities between the groups, the differences identified support caution when basing student programmes on research performed on rural GPs.
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Affiliation(s)
- G T Somers
- School of Rural Health, Monash University, PO Box 424, Traralgon, Victoria 3844, Australia.
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Strasser R. Training for rural practice. Lessons from Australia. Can Fam Physician 2001; 47:2196-8, 2203-5. [PMID: 11768913 PMCID: PMC2018457] [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: 02/23/2023]
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Mucha J, Svoboda B, Fröhwein U, Strasser R, Mischinger M, Schwihla H, Altmann F, Hane W, Schachter H, Glössl J, Mach L. Tissues of the clawed frog Xenopus laevis contain two closely related forms of UDP-GlcNAc:alpha3-D-mannoside beta-1,2-N-acetylglucosaminyltransferase I. Glycobiology 2001; 11:769-78. [PMID: 11555621 DOI: 10.1093/glycob/11.9.769] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
UDP-GlcNAc:alpha3-D-mannoside beta-1,2-N-acetylglucosaminyltransferase I (GnTI; EC 2.4.1.101) is a medial-Golgi enzyme that is essential for the processing of oligomannose to hybrid and complex N-glycans. On the basis of highly conserved sequences obtained from previously cloned mammalian GnTI genes, cDNAs for two closely related GnTI isoenzymes were isolated from a Xenopus laevis ovary cDNA library. As typical for glycosyltransferases, both proteins exhibit a type II transmembrane protein topology with a short N-terminal cytoplasmic tail (4 amino acids); a transmembrane domain of 22 residues; a stem region with a length of 81 (isoenzyme A) and 77 (isoenzyme B) amino acids, respectively; and a catalytic domain consisting of 341 residues. The two proteins differ not only in length but also at 13 (stem) and 18 (catalytic domain) positions, respectively. The overall identity of the catalytic domains of the X. laevis GnTI isoenzymes with their mammalian and plant orthologues ranges from 30% (Nicotiana tabacum) to 67% (humans). Isoenzymes A and B are encoded by two separate genes that were both found to be expressed in all tissues examined, albeit in varying amounts and ratios. On expression of the cDNAs in the baculovirus/insect cell system, both isoenzymes were found to exhibit enzymatic activity. Isoenzyme B is less efficiently folded in vivo and thus appears of lower physiological relevance than isoenzyme A. However, substitution of threonine at position 223 with alanine was sufficient to confer isoenzyme B with properties similar to those observed for isoenzyme A.
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Affiliation(s)
- J Mucha
- Zentrum für Angewandte Genetik, Universität für Bodenkultur Wien, Muthgasse 18, A-1190 Vienna, Austria
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Abstract
The 'Rural Pharmacist Training and Support Program' was a pilot project that was conducted by the Monash University Centre for Rural Health. It examined the implementation of Pharmacy Board of Victoria Guidelines to Residential Care Facilities in the Loddon Mallee region of Victoria. Through a series of workshops, pharmacists were encouraged to discuss and address difficulties that were impeding implementation of the guidelines. These included upskilling in clinical pharmacy and ways to overcome the shortage of pharmacists in rural areas. Furthermore, the project was a catalyst for eight additional outcomes. This project highlighted the challenges facing rural pharmacists as they seek to implement the guidelines and resulted in a number of recommendations that addressed workforce issues, training and continuing education, Pharmacy Board requirements, improved communication with other health professionals and undergraduate training.
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Affiliation(s)
- A Leversha
- Monash University Centre for Rural Health, Traralgon, Victoria, Australia.
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Strasser R. Keeping up to date in the country. Finding the right balance. Aust Fam Physician 2000; 29:992-3. [PMID: 11059092] [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: 02/18/2023]
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Strasser R. Rural health research: have we turned the corner? Aust J Rural Health 2000; 8:249-53. [PMID: 11894254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
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