28 results on '"Barbas S"'
Search Results
2. Outpatient parenteral antibiotic therapy (OPAT) at home in Attica, Greece
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Theocharis, G., Rafailidis, P. I., Rodis, D., Kontopidis, I., Barbas, S. G., and Falagas, M. E.
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- 2012
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3. Morbidity of foreign travelers in Attica, Greece: a retrospective study
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Theocharis, G., Polyzos, K. A., Vouloumanou, E. K., Peppas, G., Spiropoulos, T., Barbas, S. G., and Falagas, M. E.
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- 2012
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4. Comparison of morbidity of elderly patients in August and November in Attica, Greece: a prospective study
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Theocharis, G., Mavros, M. N., Vouloumanou, E. K., Peppas, G., Barbas, S. G., Spiropoulos, T., and Falagas, M. E.
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- 2012
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5. Comparison of characteristics of outpatients with 2009 H1N1 pandemic and seasonal influenza
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Theocharis, G., Vouloumanou, E. K., Barbas, S. G., Spiropoulos, T., Rafailidis, P. I., and Falagas, M. E.
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- 2011
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6. Impact of oseltamivir use on complications in patients with influenza: A prospective study
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Vardakas, K.Z., primary, Theocharis, G.S., additional, Tansarli, G.S., additional, Barbas, S., additional, Spyropoulos, T., additional, and Falagas, M.E., additional
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- 2013
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7. Comparison of morbidity of elderly patients in August and November in Attica, Greece: a prospective study
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Theocharis, G., primary, Mavros, M. N., additional, Vouloumanou, E. K., additional, Peppas, G., additional, Barbas, S. G., additional, Spiropoulos, T., additional, and Falagas, M. E., additional
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- 2011
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8. Los Angeles before Hollywood: Journalism and American Film Culture, 1905 to 1915. By Jan Olsson. (New York: Columbia University Press, 2009. 479 pp. $35.00, ISBN 978-9188468-06-2.)
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Barbas, S., primary
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- 2010
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9. Repertoire Cloning of Human Lupus Autoantibodiesa
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SILVERMAN, G. J., primary, BARBAS, S., additional, ROBEN, P., additional, and BURTON, D. R., additional
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- 2008
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10. The Bobbed Haired Bandit: A True Story of Crime and Celebrity in 1920s New York
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Barbas, S., primary
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- 2006
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11. Repertoire cloning of lupus anti-DNA autoantibodies.
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Roben, P, primary, Barbas, S M, additional, Sandoval, L, additional, Lecerf, J M, additional, Stollar, B D, additional, Solomon, A, additional, and Silverman, G J, additional
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- 1996
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12. Human autoantibody recognition of DNA.
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Barbas, S M, primary, Ditzel, H J, additional, Salonen, E M, additional, Yang, W P, additional, Silverman, G J, additional, and Burton, D R, additional
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- 1995
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13. The nature of the autoimmune antibody repertoire in human immunodeficiency virus type 1 infection.
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Ditzel, H J, primary, Barbas, S M, additional, Barbas, C F, additional, and Burton, D R, additional
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- 1994
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14. Responses of Continuous, Elastically Supported Beam Guideways to Transit Loads
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Wilson, J. F. and Barbas, S. T.
- Abstract
Solutions for nondimensional dynamic response histories are formulated for an undamped, continuous, Bernoulli-Euler beam resting on discrete, evenly-spaced, equal elastic supports. Responses depend on: The distribution of the constant force loads; a dimensionless load speed parameter; and the ratio of support stiffness to beam stiffness. Peak midspan moments and deflections are calculated over a wide range of system parameters for several beam configurations. Results are that the extreme end spans have the peak dynamic responses; that these responses increase as the relative support stiffness increases; and responses may become unbounded. Experimental measurements complement the calculations. Results are applicable to the design of cable-stayed guideways for advanced transit systems.
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- 1980
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15. Time to blood culture positivity: An independent predictor of infective endocarditis and mortality in patients with Staphylococcus aureus bacteraemia
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V. Le Moing, Sandrine Barbas, Elodie Curlier, Hélène Jean-Pierre, Willem Vanwamel, Damien Fournier, Isabelle Patry, Eric Bellissant, Jacques Reynes, Sandrine Gohier-Treuvelot, François Alla, Catherine Chirouze, Fabienne Le Gac, Catherine Neuwirth, Philippe Géraud, François Goehringer, Christine Selton-Suty, Bruno Hoen, Virginie Sussmuth, Christine Delonca, Nathalie Keil, Catherine Sportouch, Thanh Doco-Lecompte, S. Tubiana, F. Vandenesch, Laetitia Minary, S. Desage, Catherine Leport, Hepher Malela, Cécile Descottes-Genon, Lionel Piroth, Christian Michelet, Pascale Rausch, Matthieu Revest, Bernard Iung, Jerome Etienne, Albert Sotto, Vincent Le Moing, J.-P. Lavigne, Catherine Cornu, Fernando Rivadeneira, Elise Thebault, Nathalie Bedos, Pierre-Yves Donnio, Lucie Vettoretti, Michèle Bes, S. Siméon, Jean-Christophe Eicher, Catherine Lechiche, X. Duval, François Vandenesch, Marie Célard, Pascal Chavanet, Sarah Tubiana, Raymond Ruimy, M.-L. Erpelding, Thierry May, André Pechinot, Nejla Aissa, Emila Ilic Habensus, François Delahaye, C.-A. Gustave, Lorraine Letranchant, Taissia Lelekov-Boissard, C. Chirouze, Anne Tristan, Audrey Coma, Jean-Philippe Lavigne, Xavier Duval, Pierre Tattevin, Alex van Belkum, Pierre Braquet, Marie-Line Erpelding, Pascale Longuet, Malika Hadid, Marie-Christine Greusard, Florence Galtier, Anne Verchère, P. Tattevin, Service des maladies infectieuses et réanimation médicale [Rennes] = Infectious Disease and Intensive Care [Rennes], CHU Pontchaillou [Rennes], Maladies Infectieuses [CHU de Montpellier], Centre Hospitalier Universitaire de Montpellier (CHU Montpellier ), Infection, Anti-microbiens, Modélisation, Evolution (IAME (UMR_S_1137 / U1137)), Université Paris 13 (UP13)-Université Paris Diderot - Paris 7 (UPD7)-Université Sorbonne Paris Cité (USPC)-Institut National de la Santé et de la Recherche Médicale (INSERM), CIC1425 Bichat [AP-HP Hôpital Bichat - Claude Bernard] (INSERM), AP-HP - Hôpital Bichat - Claude Bernard [Paris], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire de Bactériologie [CHRU Besançon], Centre Hospitalier Régional Universitaire de Besançon (CHRU Besançon), Virulence bactérienne et maladies infectieuses (VBMI), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Service de Microbiologie [CHU Caremeau, Nîmes], Hôpital Universitaire Carémeau [Nîmes] (CHU Nîmes), Centre Hospitalier Universitaire de Nîmes (CHU Nîmes)-Centre Hospitalier Universitaire de Nîmes (CHU Nîmes), Centre d'investigation clinique [Nancy] (CIC), Université de Lorraine (UL)-Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre National de référence des Staphylocoques [HCL, Lyon] (Institut des Agents Infectieux), Hospices Civils de Lyon (HCL), Laboratoire de Bactériologie [HCL, Lyon] (Institut des Agents Infectieux), Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), ARN régulateurs bactériens et médecine (BRM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), VIRSTA/AEPEI Study Group. Chirouze C, Curlier E, Descottes-Genon C, Hoen B, Patry I, Vettoretti L, Chavanet P, Eicher JC, Gohier-Treuvelot S, Greusard MC, Neuwirth C, Péchinot A, Piroth L, Célard M, Cornu C, Delahaye F, Hadid M, Rausch P, Coma A, Galtier F, Géraud P, Jean-Pierre H, Le Moing V, Sportouch C, Reynes J, Aissa N, Doco-Lecompte T, Goehringer F, Keil N, Letranchant L, Malela H, May T, Selton-Suty C, Bedos N, Lavigne JP, Lechiche C, Sotto A, Duval X, Habensus EI, Iung B, Leport C, Longuet P, Ruimy R, Bellissant E, Donnio PY, Le Gac F, Michelet C, Revest M, Tattevin P, Thebault E, Alla F, Braquet P, Erpelding ML, Minary L, Tubiana S, Bès M, Etienne J, Lelekov-Boissard T, Tristan A, Vandenesch F, Van Belkum A, Rivadeneira F, Vanwamel W, Barbas S, Delonca C, Sussmuth V, Verchère A., Service des maladies infectieuses et réanimation médicale, Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Hôpital Pontchaillou, Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris 13 (UP13)-Université Paris Diderot - Paris 7 (UPD7)-Université Sorbonne Paris Cité (USPC), AP-HP - Hôpital Bichat - Claude Bernard [Paris]-Université Paris Diderot - Paris 7 (UPD7)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Hospitalier Régional Universitaire [Besançon] (CHRU Besançon), CHU Caremeau, Nîmes, CIC-Nancy, Institut Lorrain du Coeur et des Vaisseaux Louis Mathieu [Nancy]-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire Chrono-environnement - UFC (UMR 6249) (LCE), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Recherches Translationnelles sur le VIH et les maladies infectieuses (TransVIHMI), Université Montpellier 1 (UM1)-Institut de Recherche pour le Développement (IRD)-Université Cheikh Anta Diop [Dakar, Sénégal] (UCAD)-Universtié Yaoundé 1 [Cameroun]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), CIC Hôpital Bichat, Institut National de la Santé et de la Recherche Médicale (INSERM)-UFR de Médecine-AP-HP - Hôpital Bichat - Claude Bernard [Paris], Modèles et méthodes de l'évaluation thérapeutique des maladies chroniques (U738 / UMR_S738), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), service de maladies infectieuses CHU J Minjoz Besancon, Hôpital Jean Minjoz, Centre National de référence des Staphylocoques, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Hospices Civils de Lyon (HCL), Service des Maladies Infectieuses et Tropicales [Point-à-Pitre, Guadeloupe], CHU Pointe-à-Pitre/Abymes [Guadeloupe], Centre d'Investigation Clinique Antilles-Guyane (CIC - Antilles Guyane), Université des Antilles et de la Guyane (UAG)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pointe-à-Pitre/Abymes [Guadeloupe] -CHU de Fort de France-Centre Hospitalier Andrée Rosemon [Cayenne, Guyane Française], Service de Cardiologie [CHU de Dijon], Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), Biologie Laboratoire de Bacteriologie, Laboratoire de Microbiologie Médicale et Moléculaire, Université de Bourgogne (UB), Département d'infectiologie (CHU de Dijon), Evaluation et modélisation des effets thérapeutiques, Département biostatistiques et modélisation pour la santé et l'environnement [LBBE], Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS), REseau national d'Investigation clinique en VACcinologie (REIVAC), Assistance publique - Hôpitaux de Paris (AP-HP) (APHP)-CHU Cochin [AP-HP]-Hôtel-Dieu-Groupe hospitalier Broca-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de Gestion des Essais de Produits de Santé (CeNGEPS), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Département Maladies Infectieuses et Tropicales, Hôpital Universitaire, Montpellier, France, Service de Bactériologie [CHRU Nancy], Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy), Service des Maladies Infectieuses et Tropicales [CHRU Nancy], Service de Cardiologie [CHRU Nancy], Centre Hospitalier Régional Universitaire de Nîmes (CHRU Nîmes), Laboratoire universitaire d'antibiologie, Université Montpellier 1 (UM1), CIC - CHU Bichat, Institut National de la Santé et de la Recherche Médicale (INSERM), Hôpital Bichat - Claude Bernard, Centre d'Investigation Clinique [Rennes] (CIC), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Hôpital Pontchaillou-Institut National de la Santé et de la Recherche Médicale (INSERM), Microbiologie : Risques Infectieux, Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-CHU Pontchaillou [Rennes]-Faculté de Chirurgie Dentaire de Rennes-Faculté d'Odontologie-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Service des maladies infectieuses, Maladies chroniques, santé perçue, et processus d'adaptation (APEMAC), Université de Lorraine (UL), CHU Montpellier, Service d'Epidémiologie et Evaluations Cliniques [CHRU Nancy] (Pôle S2R), Centre National de Reference des Staphylocoques, Université de Lyon, Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lorraine (UL), Laboratoire Chrono-environnement (UMR 6249) (LCE), Université de Rennes (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), and Jonchère, Laurent
- Subjects
Male ,Methicillin-Resistant Staphylococcus aureus ,0301 basic medicine ,Microbiology (medical) ,Staphylococcus aureus ,bacteraemia ,medicine.medical_specialty ,Time Factors ,Multivariate analysis ,030106 microbiology ,Bacteremia ,Independent predictor ,medicine.disease_cause ,03 medical and health sciences ,0302 clinical medicine ,Interquartile range ,hemic and lymphatic diseases ,Internal medicine ,medicine ,Humans ,Blood culture ,Prospective Studies ,030212 general & internal medicine ,time to blood culture positivity ,Prospective cohort study ,[SDV.MP] Life Sciences [q-bio]/Microbiology and Parasitology ,Aged ,medicine.diagnostic_test ,infective endocarditis ,business.industry ,Endocarditis, Bacterial ,General Medicine ,Middle Aged ,Staphylococcal Infections ,respiratory system ,medicine.disease ,mortality ,3. Good health ,[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology ,Infectious Diseases ,Quartile ,Blood Culture ,Infective endocarditis ,Female ,business ,[SDV.MHEP]Life Sciences [q-bio]/Human health and pathology - Abstract
International audience; Objectives - Time to blood culture positivity (TTP), a routinely available parameter in automated blood culture systems, may be a proxy for infectious burden in patients with bloodstream infections. We aimed to study the association between TTP and infective endocarditis (IE), or death, in patients with Staphylococcus aureus bacteraemia. Methods - VIRSTA is a multicenter prospective cohort study that included all adult patients with S. aureus bacteraemia in eight university hospitals in France (2009-2011). We analyzed data from four centers which collected data on TTP. Regression models were used to study the association between TTP and definite IE (Duke-Li criteria), and 30 day-mortality. Results - We included 587 patients with S. aureus bacteraemia: mean age was 65.3±16.3 years, 420/587 patients (71.6%) were male, 121/587 (20.6%) died, and 42/587 (7.2%) had definite IE. Median TTP of first positive blood culture was 13.7 h (interquartile range, 9.9-18). On multivariate analysis, 30-day mortality was associated with TTP≤13.7 h (74/295 (25.1%) vs 47/292 (16.1%), P=0.02), as well as old age, McCabe score, methicillin resistance, stroke, pneumonia, and C-Reactive Protein. TTP was also independently associated with IE, but with a U-shape curve: IE was more common in the first (TTP18 h, 8/146, 5.5%) quartiles of TTP, P=0.002. Conclusions - TTP provides reliable information in patients with S. aureus bacteraemia, on the risk of IE, and prognosis, with short TTP being an independent predictor of death. This data readily available at no cost may be used to identify patients who require specific attention.
- Published
- 2019
16. Proceedings of the eighth international conference on offshore mechanics and Arctic engineering. 1989
- Author
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Barbas, S [Exxon Production Research Co., Houston, TX (USA)]
- Published
- 1989
17. Enforcing the right to health in private health systems through Judicialization what can we learn from the scoping review of the cross-national perspective?
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Mariot EAS, Barbas S, and Nunes R
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- Humans, Delivery of Health Care legislation & jurisprudence, Health Services Accessibility legislation & jurisprudence, Social Justice, Private Sector, Right to Health
- Abstract
Background: Private sector acting in healthcare does not remove the public nature of a health system, nor mitigate the right to health as a human right., Methods: This scoping review aims to answer the question: what factors influence the pattern of lawsuits seeking to enforce the right to health in private healthcare systems? The search was carried out in Pubmed, SciELO, DOAJ and Scopus., Results: Out of 464 articles found, after inclusion and exclusion criteria, 30 articles were included. The survey covered 36 different countries and four main factors were identified. The socioeconomic context, the health system model, the incorporation of the right to health in legislation, and the model of regulation of private health., Conclusions: Understanding these patterns help understanding the difficulties of implementing and guaranteeing universal health. Health systems must be based on responsibility, solidarity, equity, and distributive justice, since the sum of these values generates mutualism. Judicial decision-making regarding to health access must be reasoned on equity and distributive justice, scientific evidence and ethical factors. Even private health systems must be funded in a well-defined ethical platform and social moral valuation., Competing Interests: Declaration of interest statement The authors declare no conflict of interest., (Copyright © 2024 Elsevier B.V. All rights reserved.)
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- 2024
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18. Proteomic discovery of chemical probes that perturb protein complexes in human cells.
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Lazear MR, Remsberg JR, Jaeger MG, Rothamel K, Her HL, DeMeester KE, Njomen E, Hogg SJ, Rahman J, Whitby LR, Won SJ, Schafroth MA, Ogasawara D, Yokoyama M, Lindsey GL, Li H, Germain J, Barbas S, Vaughan J, Hanigan TW, Vartabedian VF, Reinhardt CJ, Dix MM, Koo SJ, Heo I, Teijaro JR, Simon GM, Ghosh B, Abdel-Wahab O, Ahn K, Saghatelian A, Melillo B, Schreiber SL, Yeo GW, and Cravatt BF
- Subjects
- Humans, Cysteine metabolism, Ligands, Proteomics methods, Transcription Factors
- Abstract
Most human proteins lack chemical probes, and several large-scale and generalizable small-molecule binding assays have been introduced to address this problem. How compounds discovered in such "binding-first" assays affect protein function, nonetheless, often remains unclear. Here, we describe a "function-first" proteomic strategy that uses size exclusion chromatography (SEC) to assess the global impact of electrophilic compounds on protein complexes in human cells. Integrating the SEC data with cysteine-directed activity-based protein profiling identifies changes in protein-protein interactions that are caused by site-specific liganding events, including the stereoselective engagement of cysteines in PSME1 and SF3B1 that disrupt the PA28 proteasome regulatory complex and stabilize a dynamic state of the spliceosome, respectively. Our findings thus show how multidimensional proteomic analysis of focused libraries of electrophilic compounds can expedite the discovery of chemical probes with site-specific functional effects on protein complexes in human cells., Competing Interests: Declaration of interests G.M.S., V.F.V., and L.R.W. are employees of Vividion Therapeutics, and B.F.C. is a founder and member of the Board of Directors of Vividion Therapeutics. G.W.Y. is a co-founder, member of the Board of Directors, on the SAB, equity holder, and paid consultant for Locanabio and Eclipse BioInnovations. G.W.Y.’s interests have been reviewed and approved by the University of California, San Diego in accordance with its conflict-of-interest policies. A US provisional patent has been filed related to the work disclosed in this manuscript., (Copyright © 2023 Elsevier Inc. All rights reserved.)
- Published
- 2023
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19. Phospholipase Cγ2 regulates endocannabinoid and eicosanoid networks in innate immune cells.
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Jing H, Reed A, Ulanovskaya OA, Grigoleit JS, Herbst DM, Henry CL, Li H, Barbas S, Germain J, Masuda K, and Cravatt BF
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- Animals, Antigens, CD biosynthesis, Antigens, Differentiation, Myelomonocytic biosynthesis, COS Cells, Cell Line, Chlorocebus aethiops, Cytokines immunology, Diglycerides metabolism, Group IV Phospholipases A2 metabolism, HEK293 Cells, Humans, Inflammation immunology, Lipopolysaccharides immunology, Lipoprotein Lipase metabolism, Mice, Mice, Inbred C57BL, Mice, Knockout, Microglia immunology, Monoacylglycerol Lipases metabolism, Phospholipase C gamma genetics, Prostaglandins biosynthesis, Receptors, Fc immunology, Signal Transduction immunology, Eicosanoids metabolism, Endocannabinoids metabolism, Immunity, Innate immunology, Macrophages immunology, Phospholipase C gamma metabolism
- Abstract
Human genetic studies have pointed to a prominent role for innate immunity and lipid pathways in immunological and neurodegenerative disorders. Our understanding of the composition and function of immunomodulatory lipid networks in innate immune cells, however, remains incomplete. Here, we show that phospholipase Cγ2 (PLCγ2 or PLCG2)-mutations in which are associated with autoinflammatory disorders and Alzheimer's disease-serves as a principal source of diacylglycerol (DAG) pools that are converted into a cascade of bioactive endocannabinoid and eicosanoid lipids by DAG lipase (DAGL) and monoacylglycerol lipase (MGLL) enzymes in innate immune cells. We show that this lipid network is tonically stimulated by disease-relevant human mutations in PLCγ2, as well as Fc receptor activation in primary human and mouse macrophages. Genetic disruption of PLCγ2 in mouse microglia suppressed DAGL/MGLL-mediated endocannabinoid-eicosanoid cross-talk and also caused widespread transcriptional and proteomic changes, including the reorganization of immune-relevant lipid pathways reflected in reductions in DAGLB and elevations in PLA2G4A. Despite these changes, Plcg2
-/- mice showed generally normal proinflammatory cytokine and chemokine responses to lipopolysaccharide treatment, instead displaying a more restricted deficit in microglial activation that included impairments in prostaglandin production and CD68 expression. Our findings enhance the understanding of PLCγ2 function in innate immune cells, delineating a role in cross-talk with endocannabinoid/eicosanoid pathways and modulation of subsets of cellular responses to inflammatory stimuli., Competing Interests: The authors declare no competing interest.- Published
- 2021
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20. ABHD12 and LPCAT3 Interplay Regulates a Lyso-phosphatidylserine-C20:4 Phosphatidylserine Lipid Network Implicated in Neurological Disease.
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Ichu TA, Reed A, Ogasawara D, Ulanovskaya O, Roberts A, Aguirre CA, Bar-Peled L, Gao J, Germain J, Barbas S, Masuda K, Conti B, Tontonoz P, and Cravatt BF
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- 1-Acylglycerophosphocholine O-Acyltransferase deficiency, 1-Acylglycerophosphocholine O-Acyltransferase genetics, Animals, Mice, Mice, Knockout, Molecular Structure, Monoacylglycerol Lipases deficiency, Monoacylglycerol Lipases genetics, 1-Acylglycerophosphocholine O-Acyltransferase metabolism, Monoacylglycerol Lipases metabolism, Nervous System Diseases metabolism, Phosphatidylserines metabolism
- Abstract
PHARC (polyneuropathy, hearing loss, cerebellar ataxia, retinitis pigmentosa, and cataract) is a human neurological disorder caused by deleterious mutations in the ABHD12 gene, which encodes an integral membrane lyso-phosphatidylserine (lyso-PS) lipase. Pharmacological or genetic disruption of ABHD12 leads to higher levels of lyso-PS lipids in human cells and the central nervous system (CNS) of mice. ABHD12 loss also causes rapid rewiring of PS content, resulting in selective increases in the level of arachidonoyl (C20:4) PS and decreases in the levels of other PS species. The biochemical basis for ABHD12-dependent PS remodeling and its pathophysiological significance remain unknown. Here, we show that genetic deletion of the lysophospholipid acyltransferase LPCAT3 blocks accumulation of brain C20:4 PS in mice lacking ABHD12 and concurrently produces hyper-increases in the level of lyso-PS in these animals. These lipid changes correlate with exacerbated auditory dysfunction and brain microgliosis in mice lacking both ABHD12 and LPCAT3. Taken together, our findings reveal that ABHD12 and LPCAT3 coordinately regulate lyso-PS and C20:4 PS content in the CNS and point to lyso-PS lipids as the likely bioactive metabolites contributing to PHARC-related neuropathologies.
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- 2020
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21. Proteome-wide Map of Targets of T790M-EGFR-Directed Covalent Inhibitors.
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Niessen S, Dix MM, Barbas S, Potter ZE, Lu S, Brodsky O, Planken S, Behenna D, Almaden C, Gajiwala KS, Ryan K, Ferre R, Lazear MR, Hayward MM, Kath JC, and Cravatt BF
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- 5'-Nucleotidase chemistry, 5'-Nucleotidase genetics, 5'-Nucleotidase metabolism, Acrylamides, Aniline Compounds, Animals, Cathepsins chemistry, Cathepsins metabolism, Cell Line, Tumor, Checkpoint Kinase 2 chemistry, Checkpoint Kinase 2 genetics, Checkpoint Kinase 2 metabolism, Cysteine chemistry, ErbB Receptors genetics, GPI-Linked Proteins chemistry, GPI-Linked Proteins genetics, GPI-Linked Proteins metabolism, HEK293 Cells, Humans, Liver metabolism, Lysosomes metabolism, Mice, Mice, Inbred C57BL, Mutagenesis, Site-Directed, Piperazines chemistry, Piperazines metabolism, Protein Kinase Inhibitors metabolism, Proteomics, Rhodamines chemistry, Transplantation, Heterologous, ErbB Receptors metabolism, Protein Kinase Inhibitors chemistry, Proteome analysis
- Abstract
Patients with non-small cell lung cancers that have kinase-activating epidermal growth factor receptor (EGFR) mutations are highly responsive to first- and second-generation EGFR inhibitors. However, these patients often relapse due to a secondary, drug-resistant mutation in EGFR whereby the gatekeeper threonine is converted to methionine (T790M). Several third-generation EGFR inhibitors have been developed that irreversibly inactivate T790M-EGFR while sparing wild-type EGFR, thus reducing epithelium-based toxicities. Using chemical proteomics, we show here that individual T790M-EGFR inhibitors exhibit strikingly distinct off-target profiles in human cells. The FDA-approved drug osimertinib (AZD9291), in particular, was found to covalently modify cathepsins in cell and animal models, which correlated with lysosomal accumulation of the drug. Our findings thus show how chemical proteomics can be used to differentiate covalent kinase inhibitors based on global selectivity profiles in living systems and identify specific off-targets of these inhibitors that may affect drug activity and safety., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF
22. Chemoselective Preparation of Clickable Aryl Sulfonyl Fluoride Monomers: A Toolbox of Highly Functionalized Intermediates for Chemical Biology Probe Synthesis.
- Author
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Fadeyi O, Parikh MD, Chen MZ, Kyne RE Jr, Taylor AP, O'Doherty I, Kaiser SE, Barbas S, Niessen S, Shi M, Weinrich SL, Kath JC, Jones LH, and Robinson RP
- Subjects
- Click Chemistry, Models, Molecular, Molecular Probes chemistry, Molecular Structure, Sulfinic Acids chemistry, Molecular Probes chemical synthesis, Sulfinic Acids chemical synthesis
- Abstract
Sulfonyl fluoride (SF)-based activity probes have become important tools in chemical biology. Herein, exploiting the relative chemical stability of SF to carry out a number of unprecedented SF-sparing functional group manipulations, we report the chemoselective synthesis of a toolbox of highly functionalized aryl SF monomers that we used to quickly prepare SF chemical biology probes. In addition to SF, the monomers bear an embedded click handle (a terminal alkyne that can perform copper(I)-mediated azide-alkyne cycloaddition). The monomers can be used either as fragments to prepare clickable SF analogues of drugs (biologically active compounds) bearing an aryl ring or, alternatively, attached to drugs as minimalist clickable aryl SF substituents., (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
- Published
- 2016
- Full Text
- View/download PDF
23. A survey of the sedation practice of Portuguese palliative care teams.
- Author
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Gonçalves F, Cordero A, Almeida A, Cruz A, Rocha C, Feio M, Silva P, Barbas S, and Neves S
- Subjects
- Adult, Aged, Aged, 80 and over, Delirium etiology, Female, Humans, Male, Midazolam therapeutic use, Middle Aged, Neoplasms complications, Portugal, Prospective Studies, Conscious Sedation statistics & numerical data, Deep Sedation statistics & numerical data, Delirium therapy, Hypnotics and Sedatives therapeutic use, Palliative Care statistics & numerical data, Practice Patterns, Physicians' statistics & numerical data
- Abstract
Aim: The purpose of this study is to study the practice of sedation by Portuguese palliative care teams., Methods: The teams included on the website of the Portuguese Association for Palliative Care were invited to participate. Data from all the patients sedated between April and June 2010 were recorded. Sedation was defined as the intentional administration of sedative drugs for symptom control, except insomnia, independently of the consciousness level reached., Results: Of the 19 teams invited only 4 actually participated. During the study period, 181 patients were treated: 171 (94 %) were cancer patients and 10 non-cancer patients. Twenty-seven (16 %) patients were sedated: 13 intermittently, 11 continuously, and 3 intermittently at first then continuously. The rate of sedation varied substantially among the teams. Delirium was the most frequent reason for sedation. Midazolam was the drug used in most cases. In 21 cases of sedation, the decision was made unilaterally by the professionals; in 16 (76 %) of those, the situation was deemed to be emergent. From the patients on continuous sedation, 9 (64 %) patients maintained oxygen, 13 (93 %) hydration, and 6 (43 %) nutrition. Two patients who had undergone intermittent sedation were discharged home and one was transferred to another institution; the reason for sedation in the three cases was delirium., Conclusion: There is a substantial variation in the sedation rate among the teams. One of the most important aspects was the decision-making process which should be object of reflection and discussion in the teams.
- Published
- 2012
- Full Text
- View/download PDF
24. We are what we eat.
- Author
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Barbas S
- Subjects
- Agriculture history, History, 17th Century, History, 18th Century, History, 19th Century, History, 20th Century, Humans, United States, Diet history
- Published
- 2006
- Full Text
- View/download PDF
25. Redundant and distinct functions for dynamin-1 and dynamin-2 isoforms.
- Author
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Altschuler Y, Barbas SM, Terlecky LJ, Tang K, Hardy S, Mostov KE, and Schmid SL
- Subjects
- Adenoviridae genetics, Animals, Biological Transport, Cell Line, Cell Polarity, Dogs, Dynamin I, Dynamins, GTP Phosphohydrolases genetics, Gene Expression Regulation drug effects, Genetic Vectors, HeLa Cells, Humans, Kidney, Microscopy, Fluorescence, Protein Isoforms genetics, Recombinant Fusion Proteins metabolism, Tetracycline pharmacology, Endocytosis physiology, GTP Phosphohydrolases physiology, Protein Isoforms physiology
- Abstract
A role for dynamin in clathrin-mediated endocytosis is now well established. However, mammals express three closely related, tissue-specific dynamin isoforms, each with multiple splice variants. Thus, an important question is whether these isoforms and splice variants function in vesicle formation from distinct intracellular organelles. There are conflicting data as to a role for dynamin-2 in vesicle budding from the TGN. To resolve this issue, we compared the effects of overexpression of dominant-negative mutants of dynamin-1 (the neuronal isoform) and dynamin-2 (the ubiquitously expressed isoform) on endocytic and biosynthetic membrane trafficking in HeLa cells and polarized MDCK cells. Both dyn1(K44A) and dyn2(K44A) were potent inhibitors of receptor-mediated endocytosis; however neither mutant directly affected other membrane trafficking events, including transport mediated by four distinct classes of vesicles budding from the TGN. Dyn2(K44A) more potently inhibited receptor-mediated endocytosis than dyn1(K44A) in HeLa cells and at the basolateral surface of MDCK cells. In contrast, dyn1(K44A) more potently inhibited endocytosis at the apical surface of MDCK cells. The two dynamin isoforms have redundant functions in endocytic vesicle formation, but can be targeted to and function differentially at subdomains of the plasma membrane.
- Published
- 1998
- Full Text
- View/download PDF
26. Repertoire cloning of human lupus autoantibodies.
- Author
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Silverman GJ, Barbas S, Roben P, and Burton DR
- Subjects
- Antibodies, Antinuclear immunology, Antibodies, Monoclonal immunology, Antibody Affinity, B-Lymphocytes metabolism, DNA immunology, DNA, Single-Stranded immunology, Diseases in Twins, Feasibility Studies, Humans, Immunoglobulin G immunology, Lupus Erythematosus, Systemic immunology, RNA, Messenger genetics, RNA, Messenger isolation & purification, Antibodies, Antinuclear genetics, Antibodies, Monoclonal genetics, Bacteriophage M13 genetics, Cloning, Molecular methods, Gene Library, Immunoglobulin G genetics, Lupus Erythematosus, Systemic genetics
- Published
- 1995
- Full Text
- View/download PDF
27. [Foreign-body aspiration in adults].
- Author
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Travassos Júnior RR, Barbas SV, Fernandes JM, Mendes MJ, Fiks IN, Ribeiro CS, and Barbas Filho JV
- Subjects
- Airway Obstruction etiology, Bronchoscopy, Female, Foreign Bodies diagnostic imaging, Foreign Bodies therapy, Humans, Male, Middle Aged, Radiography, Bronchi, Foreign Bodies complications, Inhalation
- Abstract
Proximal airway obstruction and acute life-threatening asphyxia is the most important complication of foreign body aspiration. Small foreign bodies that transverse the larynx may be initially asymptomatic appearing serious respiratory disturbances only later. Three patients with different clinical evolutions are reported and the diagnostic and therapeutic approaches, discussed.
- Published
- 1991
28. [War hysteria. Comparative study of its manifestations during the last 2 world conflicts].
- Author
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Lefebvre P and Barbas S
- Subjects
- Combat Disorders diagnosis, France, History, 20th Century, Humans, Hysteria etiology, Hysteria psychology, Military Psychiatry history, Psychopathology, Psychophysiologic Disorders etiology, Combat Disorders history, Conversion Disorder history, Hysteria history, Stress Disorders, Post-Traumatic history
- Published
- 1984
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