Time filter

Source Type

La Tronche, France

Lamy S.,French Institute of Health and Medical Research | Lamy S.,University Paul Sabatier | De Gaudemaris R.,Laboratoire TIMC IMAG | De Gaudemaris R.,French National Center for Scientific Research | And 10 more authors.
Journal of Occupational and Environmental Medicine | Year: 2013

Objectives: This longitudinal study aimed to test the hypothesis that organizational work factors (OWFs) may be related to depressive symptoms through an increased effort-reward imbalance (ERI) ratio among registered nurses (RNs) and nursing assistants working in hospitals. Methods: We studied 2117 female RNs and nursing assistants who stayed in the same work unit and position during the follow-up from the ORSOSA (ORganisation des SOins-SAnté) longitudinal study. The work characteristics and workers' health were assessed in 2006 and 2008. Results: We confirmed our hypothesis of both direct and mediated effects of OWFs on workers' health. We showed that issues about patient-related information exchanges increased RNs' depressive disorders by increasing first a perceived ERI. Conclusions: Our results advocate integrating both the work organizational level and the individual level into preventive actions to improve workers' mental health. Copyright © 2013 by American College of Occupational and Environmental Medicine.

Karimi G.,University Paris - Sud | Houee Levin C.,University Paris - Sud | Dagher M.C.,Laboratoire TIMC IMAG | Baciou L.,University Paris - Sud | Bizouarn T.,University Paris - Sud
Biochimica et Biophysica Acta - General Subjects | Year: 2014

Background The phagocyte NADPH-oxidase is a multicomponent enzyme that generates superoxide anions. It comprises a membrane redox component flavocytochrome b558 and four cytosolic proteins (p67phox, p47phox, p40phox and Rac) that must assemble to produce an active system. In this work we focused on the spatio-temporal control of the activation process of phagocyte NADPH oxidase. Methods A wide range of techniques including fast kinetics with a stopped-flow apparatus and various combinations of the activating factors was used to test the order of assembly and the role of the p47phox-p67phox complex. Results The data presented here are consistent with the absence of a catalytic role of the p47phox-p67phox interacting state and support the idea of independent binding sites for the cytosolic proteins on the flavocytochrome b558 allowing random binding order. However, the formation of the active complex appears to involve a synergistic process of binding of the activated cytosolic subunits to cytochrome b558. All partners should be in the vicinity for optimal assembly, a delay or the absence of one of the partners in this process seems to lead to a decrease in the efficiency of the catalytic core. Conclusion and general significance The activation and assembly of the NADPH oxidase components have to be achieved simultaneously for the formation of an efficient and optimal enzyme complex. This mechanism appears to be incompatible with continuous fast exchanges of the cytosolic proteins during the production of superoxide ion in the phagosome. © 2014 Elsevier B.V.

Heroux J.,U.S. National Institute of Diabetes and Digestive and Kidney Diseases | Heroux J.,U.S. National Institutes of Health | Gharib A.M.,U.S. National Institute of Diabetes and Digestive and Kidney Diseases | Danthi N.S.,Laboratory of Diagnostic Radiology Research | And 5 more authors.
Molecular Imaging and Biology | Year: 2010

Purpose: A newly developed synthetic αvβ3 integrin targeted optical probe (ITOP) has been demonstrated to target cancer cells, in vivo. Compared to the commercially available cyclic peptide c[RGDfv], this optical probe has at least 20 times better binding affinity for the αvβ3 receptor. The present in vitro study was designed to investigate the possibility of detecting early atherosclerotic plaque by using this ITOP. Procedures: Experiments were performed on five Watanabe heritable hyperlipidemic rabbits and two New Zealand White rabbits for control. Our ITOP was used for detecting the presence of αvβ3 receptors in vitro. Results: Segments of plaque accumulation from two distinct regions of ascending and descending aortas were labeled in Watanabe rabbits. The signal was found principally in the adventitia and proximal intima of the aortic vessel, corresponding directly to the expression of integrin αvβ3 as determined by antibody assay. Moreover, there was a close association between the level of labeling with the αvβ3 targeted probe and the thickness of the adventitia. Conclusions: This high-affinity ITOP identifies the site and extent of αvβ3 expression and correlates with adventitial thickness. Recent evidence associates αvβ3 expression with the inflammatory process in early vulnerable plaque, making this compound a promising potential biomarker for early atherosclerotic disease. © 2009 Academy of Molecular Imaging.

Arnaud J.,French Institute of Health and Medical Research | Arnaud J.,Grenoble University Hospital Center | de Lorgeril M.,CNRS Complex Medical Engineering Laboratory | Akbaraly T.,Montpellier University | And 43 more authors.
Nutrition, Metabolism and Cardiovascular Diseases | Year: 2012

Background and aims: The European 'IMMIDIET' study was designed to evaluate the effect of genetic and dietary habit interactions on cardiovascular disease risk factors in non-diabetic subjects. Copper, zinc and selenium are involved in redox balance and modifications of their homeostasis could be associated with metabolic syndrome. Because few studies have dealt with trace element status in metabolic syndrome with conflicting results, we aimed at investigating the relationships between plasma copper, zinc and selenium concentrations and metabolic syndrome in the IMMIDIET population. Methods and results: Male-female couples born and living in Abruzzo, Italy (n = 271); Limburg, Belgium (n = 267), southwest part of London, England (n = 263) and 205 Italian-Belgian mixed couples living in Belgium were enrolled. Data on medical history, hypertension and blood lipid profile, medication use, smoking and alcohol habits, physical activity and socioeconomic status were collected using a standardised questionnaire. Anthropometric, blood pressure, glucose, insulin, lipid profile and copper, zinc and selenium measurements were performed. Participants were classified in two groups according to the presence of metabolic syndrome (Yes/No).Comparison between these two groups, performed separately in men and women, indicated no association in men whereas, in women, metabolic syndrome was associated with higher plasma selenium concentrations (odds ratio (OR) = 1.55(1.28-1.89)); this association remained significant after adjustment for age, group, social status, physical activity, energy intake, alcohol consumption, smoking and hormonal status (OR = 1.33 (1.06-1.67)). Conclusion: Our results indicate gender differences in the association between plasma selenium concentration and metabolic syndrome without diabetes and may suggest a sub-clinical deleterious effect of high selenium status in women. © 2010 Elsevier B.V..

Norris V.,Genopole | Norris V.,University of Rouen | Zemirline A.,Genopole | Amar P.,Genopole | And 35 more authors.
Theory in Biosciences | Year: 2011

The relevance of biological materials and processes to computing-alias bioputing-has been explored for decades. These materials include DNA, RNA and proteins, while the processes include transcription, translation, signal transduction and regulation. Recently, the use of bacteria themselves as living computers has been explored but this use generally falls within the classical paradigm of computing. Computer scientists, however, have a variety of problems to which they seek solutions, while microbiologists are having new insights into the problems bacteria are solving and how they are solving them. Here, we envisage that bacteria might be used for new sorts of computing. These could be based on the capacity of bacteria to grow, move and adapt to a myriad different fickle environments both as individuals and as populations of bacteria plus bacteriophage. New principles might be based on the way that bacteria explore phenotype space via hyperstructure dynamics and the fundamental nature of the cell cycle. This computing might even extend to developing a high level language appropriate to using populations of bacteria and bacteriophage. Here, we offer a speculative tour of what we term bactoputing, namely the use of the natural behaviour of bacteria for calculating. © 2011 The Author(s).

Discover hidden collaborations