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Allard J, Delvoye F, Pop R, Labreuche J, Maier B, Marnat G, Sibon I, Zhu F, Lapergue B, Consoli A, Spelle L, Denier C, Richard S, Piotin M, Gory B, Mazighi M, Redjem H, Escalard S, Dessilles JP, Delvoye F, Smajda S, Maier B, Solène H, Mazighi M, Obadia M, Sabben C, Pierre S, Igor R, Corabianu O, de Broucker T, Manchon E, Taylor G, Maacha MB, Thion LA, Augustin L, Julien S, Wang A, Evrard S, Tchikviladze M, Ajili N, WeisenburgerLile D, Gorza L, Buard G, Coskun O, Di Maria F, Rodesh G, Zimatore S, Leguen M, Gratieux J, Pico F, Rakotoharinandrasana H, Tassan P, Poll R, Marinier S, Barreau X, Berge J, Menegon P, Lucas L, Olindo S, Renou P, Sagnier S, Poli M, Debruxelles S, Rouanet F, Tourdias T, Liegey JS, Briau P, Pangon N, Coussy A, Papillon L, Papaxanthos J, Detraz L, Daumas-Duport B, Alexandre PL, Roy M, Lenoble C, Desal H, Guillon B, de Gaalon S, Preterre C, Bracard S, Anxionnat R, Braun M, Derelle AL, Tonnelet R, Liao L, Zhu F, Schmitt E, Planel S, Humbertjean L, Lacour JC, Riou-Comte N, Voicu M, Alb L, Reitter M, Brezeanu M, Masson A, Tabarna A, Podar I, Macian-Montoro F, Saleme S, Mounayer C, Rouchaud A, Costalat V, Arquizan C, Dargazanli C, Gascou G, Lefèvre PH, Derraz I, Riquelme C, Gaillard N, Mourand I, Corti L, Cagnazzo F, Ter Schiphorst A, Ferre JC, Raoult H, Ronziere T, Lassale M, Paya C, Gauvrit JY, Tracol C, Langnier-Lemercier S. 24-Hour Carotid Stent Patency and Outcomes After Endovascular Therapy: A Multicenter Study. Stroke 2023; 54:124-131. [PMID: 36542074 DOI: 10.1161/strokeaha.122.039797] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND Management of extracranial internal carotid artery steno-occlusive lesion during endovascular therapy remains debated. Stent occlusion within 24 hours of endovascular therapy is a frequent event after acute carotid artery stenting, and we currently lack large population results. We investigated the incidence, predictors, and clinical impact of stent occlusion after acute carotid artery stenting in current clinical practice. METHODS Patients treated by endovascular therapy with acute carotid artery stenting between 2015 and 2019 in 5 large-volume endovascular-capable centers were retrospectively analyzed. Patients were separated in 2 groups according to the stent patency at 24 hours after carotid artery stenting. We compared baseline characteristics, treatment modalities, and clinical outcome depending on 24-hour stent patency. Primary end point was favorable outcome, defined as a modified Rankin Scale score 0-2 at 3 months. RESULTS A stent occlusion was observed in 47/225 patients (20.9%). Patients with stent patency had a lower baseline National Institutes of Health Stroke Scale (median [interquartile range]: 13 [7-17] versus 18 [12-21]) and had more often stroke of atherothrombotic origin (77.0% versus 53.2%). A higher stent patency rate was found for patients treated with P2Y12 antagonists at the acute phase (odds ratio [OR]' 2.95 [95% CI' 1.10-7.91]; P=0.026) and treated with angioplasty (OR' 2.42 [95% CI' 1.24-4.67]; P=0.008). A better intracranial angiographic reperfusion was observed in patients with 24-hour stent patency compared with patients without stent patency (OR' 8.38 [95% CI' 3.07-22.78]; P<0.001). Patients with a stent patency at 24 hours had a higher chance of favorable outcome (OR' 3.29 [95% CI, 1.66-6.52]; P<0.001) and a lower risk of death (OR' 0.32 [95% CI, 0.13-0.76]; P=0.009). CONCLUSIONS One out of 5 patients treated with carotid artery stenting during endovascular therapy presented a stent occlusion within 24 hours. This event was associated with worse functional outcome. Stroke etiology, P2Y12 antagonist administration, quality of intracranial reperfusion, and angioplasty were associated with 24-hour stent patency.
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Affiliation(s)
- Julien Allard
- Department of Interventional Neuroradiology, Rothschild Foundation, Paris, France (J.A., F.D., B.M., MP, M.M.).,University of Paris' France (J.A., M.M.)
| | - François Delvoye
- Department of Interventional Neuroradiology, Rothschild Foundation, Paris, France (J.A., F.D., B.M., MP, M.M.)
| | - Raoul Pop
- Department of Neuroradiolology, CHU Strasbourg, France (R.P.).,Institut de Chirurgie Minime Invasive Guidée par l'Image, Strasbourg, France (R.P.).,University of Strasbourg, INSERM UMR-S1255, France (R.P.)
| | - Julien Labreuche
- Department of Biostatistics, CHU Lille, University of Lille, France (J.L.)
| | - Benjamin Maier
- Department of Interventional Neuroradiology, Rothschild Foundation, Paris, France (J.A., F.D., B.M., MP, M.M.).,LVTS, INSERM U1148, University of Paris, France (BM., M.M.)
| | - Gaultier Marnat
- Department of Diagnostic and Interventional Neuroradiology, University Hospital of Bordeaux, France (G.M.)
| | - Igor Sibon
- Department of Neurology, Stroke Center, University Hospital of Bordeaux, France (I.S.)
| | - François Zhu
- Department of Diagnostic and Therapeutic Neuroradiology, CHRU-Nancy, Université de Lorraine, France (B.G., F.Z.)
| | - Bertrand Lapergue
- Department of Neurology, Foch Hospital, Versailles Saint-Quentin en Yvelines University, Suresnes, France (B.L.)
| | - Arturo Consoli
- Diagnostic and Interventional Neuroradiology, Foch Hospital, Versailles Saint-Quentin en Yvelines University, Suresnes, France (A.C.)
| | - Laurent Spelle
- Department of Neuroradiolology, CHU Kremlin-Bicêtre, Le Kremlin Bicêtre, France (L.S.)
| | - Christian Denier
- Department of Neurology, CHU Kremlin-Bicêtre, Le Kremlin Bicêtre, France (C.D.)
| | - Sébastien Richard
- Department of Neurology, Stroke Unit, Université de Lorraine, CHRU-Nancy, France (S.R.).,CIC-P 1433, INSERM U1116, CHRU-Nancy, France (S.R.)
| | - Michel Piotin
- Department of Interventional Neuroradiology, Rothschild Foundation, Paris, France (J.A., F.D., B.M., MP, M.M.)
| | - Benjamin Gory
- Department of Diagnostic and Therapeutic Neuroradiology, CHRU-Nancy, Université de Lorraine, France (B.G., F.Z.).,IADI, INSERM U1254, Université de Lorraine, Nancy, France (B.G.)
| | - Mikael Mazighi
- Department of Interventional Neuroradiology, Rothschild Foundation, Paris, France (J.A., F.D., B.M., MP, M.M.).,LVTS, INSERM U1148, University of Paris, France (BM., M.M.).,University of Paris' France (J.A., M.M.)
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Jorajuria S, Vees M, Pierre S, Terao E. Establishment of Ph. Eur. Somatropin/desamidosomatropin resolution mixture Chemical Reference Substance batch 2. Pharmeur Bio Sci Notes 2022; 2022:32-36. [PMID: 35702978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The control of somatropin products according to the monographs of the European Pharmacopoeia (Ph. Eur.) requires a system suitability preparation for the test for related proteins by liquid chromatography. A preparation consisting in a mixture of somatropin and desamidosomatropin, such as the Ph. Eur. Somatropin/desamidosomatropin resolution mixture Chemical Reference Substance (CRS), is to be used to ascertain adequate resolution of the chromatographic setup. Due to low stocks, the Biological Standardisation Programme (BSP) of the Council of Europe and the European Union ran a study to establish a new batch of this system suitability CRS. A freeze-dried candidate batch (cCRS2) was produced and tested at the European Directorate for the Quality of Medicines and HealthCare (EDQM, Council of Europe). The resolution between the peaks due to somatropin and desamidosomatropin was 1.7 and the symmetry factor for the somatropin peak was 1.2. The mean percentage area of the desamidosomatropin peak was 14.6 %. These results showed that cCRS2 is suitable for its intended purpose. Based on these data, in May 2020 the Ph. Eur. Commission established the candidate batch as Ph. Eur. Soma-tropin/desamidosomatropin resolution mixture CRS batch 2.
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Affiliation(s)
- S Jorajuria
- European Directorate for the Quality of Medicines & HealthCare (EDQM), Laboratory Department (DLab), Council of Europe, Strasbourg, France
| | - M Vees
- European Directorate for the Quality of Medicines & HealthCare (EDQM), Laboratory Department (DLab), Council of Europe, Strasbourg, France
| | - S Pierre
- EDQM, Department of Reference Standards & Logistics (DRSL), Council of Europe, Strasbourg, France
| | - E Terao
- EDQM, Department of Biological Standardisation, OMCL Network & HealthCare (DBO), Council of Europe, Strasbourg, France
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Zarglayoun H, Arbour C, Delage J, Pierre S, Tremblay M, Hjeij D, Rainville P, Ogez D. How Fast Can Nurses Learn Therapeutic Communication Skills? A Pilot Study on Brief Hypnotic Communication Training Conducted with Oncology Nurses. PSYCHO-ONCOLOGIE 2022. [DOI: 10.3166/pson-2022-0202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Objective: This project aimed to train nurses on an oncology unit in hypnotic communication to reduce treatment-related pain and anxiety in their patients. A pilot study was conducted to assess changes in hypnotic communication behaviors associated with the training.
Methods: Nurses were recruited and their interactions during a simulated patient admission for treatment (before and after training) were recorded. Hypnotic communication skills were assessed by independent reviewers using a training checklist listing different hypnotic communication techniques and a validated assessment scale (Sainte-Justine Hypnotic Communication Assessment Scale, SJ-HCAS).
Results: Seven nurses were evaluated. Wilcoxon paired-sample tests (pre–post) reported significant improvement with large effect sizes in the total score of the training grid (P = 0.034, r = 0.832) and significant improvement with large effect sizes in the relational (P = 0.018, r = 0.930) and total (P = 0.021, r = 0.903) scores of the SJ-HCAS.
Conclusion: This pilot study shows promising results regarding the effectiveness of hypnotic communication training for nurses. These acquired skills could translate into improved treatment experience with patients and could be transferred to other professionals and settings in the health care system.
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Nogueira D, Keppi B, Regnier-Vigouroux G, Scalici E, Cens S, Trebesses L, Malafosse F, Pierre S, Montagut M, Benchaib M. P–756 Predictive factors influencing multiple live births in cumulative IVF cycles: retrospective analysis of over 265000 embryo transfer procedures from the national French registry. Hum Reprod 2021. [DOI: 10.1093/humrep/deab130.755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Study question
What are the factors that could predict the number of embryos to be transferred in order to diminish risk of multiple pregnancies?
Summary answer
Single embryo transfer (SET) is advisable for <38 year-old women in fresh cycles and for <35 year-old women in FET whatever the IVF number attempts.
What is known already
Multiple pregnancies are associated to increased maternal and perinatal complications. Risks associated to multiple implantations are significantly reduced with SET policy. However, while SET is more assertive with a lesser negative impact in younger patients (<35 years), its feasibility is less evident for the older population, whom oocyte quality is likely compromised. A double embryo transfer (DET) could improve chances of implantation and shorten their time to pregnancy. Identification of risk factors for multiple pregnancies could help in decision making for a double or SET and reduce chances for multiple gestations without reducing the chances to achieve pregnancy.
Study design, size, duration
A retrospective study from the national French data registry provided and approved by the Agence de la Biomédecine was performed. A total of 196530 fresh and 68913 frozen cycles from women aged 18–43 year-old were included (2014–2017). Risk factors assessed included women’s age, number of attempts, number of oocytes, fertilization rate, embryo stage, number of embryos transferred, number of supernumerary embryos frozen. Secondary infertility, oocyte donor, oocyte freezing, PGT, freeze-all and IVM cycles were excluded.
Participants/materials, setting, methods
Cumulative cycles derived from 65% of ICSI, 32% of IVF and 3,2% IVF/ICSI. The distribution of patients age at oocyte retrieval was 60% < 35, 21% < 38, 11% < 40, and 8% ≥ 40 years old. Multivariable logistic regression was conducted to calculate adjusted odds ratios with 95% confidence intervals for live birth chance and multiple live birth risk associated with each risk factor.
Main results and the role of chance
The chances of obtaining a cumulative live birth decreases with increased patients age (OR 0.71 for 35–38 years and 0.47 for 38–40 years, p < 0.00001), with increased number of attempts (from OR 0.87 for attempt = 2 to OR 0.74 for attempt ≥ 4, p < 0.00001), and for frozen embryos transferred (OR 0.14, p < 0.00001). The chances of live birth increases with the increased number of oocytes (from OR 1.33 for 4–12 to OR 1.52 for > 18, p < 0.00001 in all cases), with a fertilisation rate >40% (OR 1.29, p < 0.00001), with blastocyst transfer (OR 1.29, p < 0.00001), with the increase on the number of frozen embryos (OR 7.37 for >1, OR 13.08 for >2, and OR 16.92 for >6, p < 0.00001 in all cases) and number of embryos transferred (OR 1.42 for 2 embryos and OR 1.39 for >2 embryos, p < 0.00001 in all cases).
In case of live birth, the risks of multiple births when two embryos were transferred decreases in patients aged >38 years (OR 0.50, p < 0.00001) and for frozen embryos transferred (OR 0.65, p < 0.00001). The risk increases with a fertilisation rate >60% (OR 1.30, p < 0.00001), with blastocysts transfer (OR 1.34, p < 0.00001) and when at least one supernumerary embryo is frozen (OR > 1.30, p < 0.00001).
Limitations, reasons for caution
This study is limited in only providing a risk-benefit balance for multiples on the choice of transferring one or two embryos. Clinical data such as stimulation protocols and doses of gonadotropins were not considered in this evaluation.
Wider implications of the findings: This study provides help to develop a strategy for the medical staff in the decision making for the number of embryos to be transferred. It may also serve as a patient’s information aid and help to improve their chances of achieving a health singleton if pregnant.
Trial registration number
Not applicable
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Affiliation(s)
- D Nogueira
- INOVIE Fertilité, Center for Reproductive Biology, Toulouse, France
| | - B Keppi
- GenBio - INOVIE Fertilité, Center for Reproductive Biology, Clermont Ferrand, France
| | - G Regnier-Vigouroux
- Clinique Saint Roch - INOVIE Fertilité, Center for Reproductive Biology, Montpellier, France
| | - E Scalici
- Bioaxiome - INOVIE Fertilité, Center for Reproductive Biology, Avignon, France
| | - S Cens
- BioPyrenées -INOVIE Fertilité, Center for Reproductive Biology, Pau, France
| | - L Trebesses
- Aix Bio Océan - INOVIE Fertilité, Center for Reproductive Biology, Bayonne, France
| | - F Malafosse
- FIV 66 - INOVIE Fertilité, Center for Reproductive Biology, Perpignan, France
| | - S Pierre
- Clinique Saint Roch, Center for Reproductive Biology, Montpellier, France
| | - M Montagut
- Clinique Croix du Sud - INOVIE Fertilité, Center for Reproductive Biology, Toulouse, France
| | - M Benchaib
- Hôpital Femme Mère Enfant, Center for Reproductive Medicine, Lyon, France
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Chevallier C, Pierre S, Grenet G, Theuillon T, Bahri-Es-Sayah N, Pellisier M, Pizzoglio V, Atzenhoffer M. Sati-SHUPT: Satisfaction survey on requests addressed to the pharmacotoxicology department help desk. Toxicologie Analytique et Clinique 2021. [DOI: 10.1016/j.toxac.2020.10.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sim HW, Stundzia A, Pierre S, Metser U, O’Malley M, Elimova E, Sridhar S, Hansen A. Predictive radiomics signature for treatment response to nivolumab in patients (pts) with advanced renal cell carcinoma (RCC). Ann Oncol 2018. [DOI: 10.1093/annonc/mdy283.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mascolo-Fortin J, Mathieu D, Vu T, Bedwani S, Pierre S, Bernard AA, Doucet R. Réduction de dose cardiaque lors de l’irradiation du sein gauche par tomothérapie hélicoïdale. Cancer Radiother 2018. [DOI: 10.1016/j.canrad.2018.07.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Pierre S, Sabot B, Cassette P, Liang J, Courte S, Ferreux L, Ratel G. Bias in the measurement of radon gas using ionization chambers: Application to SIR. Appl Radiat Isot 2018; 134:13-17. [DOI: 10.1016/j.apradiso.2017.10.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 10/20/2017] [Accepted: 10/22/2017] [Indexed: 11/24/2022]
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Lépy MC, Brondeau L, Ménesguen Y, Pierre S, Riffaud J. Consistency of photon emission intensities for efficiency calibration of gamma-ray spectrometers in the energy range from 20keV to 80keV. Appl Radiat Isot 2017; 134:131-136. [PMID: 28697980 DOI: 10.1016/j.apradiso.2017.07.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 07/04/2017] [Accepted: 07/04/2017] [Indexed: 11/24/2022]
Abstract
The efficiency calibration for different high-purity germanium detectors in the low-energy range was established by the conventional method, using standard radioactive sources. The peak shapes were carefully analysed taking account of natural linewidth, full-energy width at half maximum and scattering. Complementary information was obtained by Monte Carlo simulation using the PENELOPE code, after optimization of the geometrical parameters. This was used to measure photon emission intensities of some low-energy emitting radionuclides, including 133Ba, and compared to the tabulated values.
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Affiliation(s)
- M-C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât.602 PC111, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France.
| | - L Brondeau
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât.602 PC111, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Y Ménesguen
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât.602 PC111, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - S Pierre
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât.602 PC111, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - J Riffaud
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât.602 PC111, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
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Pierre S, Hewson I, Sparks JP, Litton CM, Giardina C, Groffman PM, Fahey TJ. Ammonia oxidizer populations vary with nitrogen cycling across a tropical montane mean annual temperature gradient. Ecology 2017; 98:1896-1907. [DOI: 10.1002/ecy.1863] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 02/06/2017] [Accepted: 03/27/2017] [Indexed: 11/07/2022]
Affiliation(s)
- S. Pierre
- Department of Ecology and Evolutionary Biology Cornell University Ithaca New York USA
| | - I. Hewson
- Department of Microbiology Cornell University Ithaca New York USA
| | - J. P. Sparks
- Department of Ecology and Evolutionary Biology Cornell University Ithaca New York USA
| | - C. M. Litton
- Department of Natural Resources and Environmental Management University of Hawaii at Manoa Honolulu Hawaii USA
| | - C. Giardina
- Institute of Pacific Islands Forestry Pacific Southwest Research Station US Forest Service Hilo Hawaii USA
| | - P. M. Groffman
- Cary Institute of Ecosystem Studies Millbrook New York USA
- CUNY Advanced Science Research Center New York New York USA
| | - T. J. Fahey
- Department of Natural Resources Cornell University Ithaca New York USA
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Marouli M, Pommé S, Van Ammel R, García-Toraño E, Crespo T, Pierre S. Direct measurement of alpha emission probabilities in the decay of 226Ra. Appl Radiat Isot 2017; 125:196-202. [PMID: 28476016 DOI: 10.1016/j.apradiso.2017.04.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 04/18/2017] [Accepted: 04/26/2017] [Indexed: 10/19/2022]
Abstract
High-resolution alpha-particle spectrometry was performed to determine the main alpha-particle emission probabilities in the decay of 226Ra. Thin, homogeneous sources were prepared by electrodeposition on stainless steel disks. Alpha spectra with an energy resolution of 20keV were obtained in three laboratories and analysed with different deconvolution algorithms. In two set-ups, a magnet system was used to deflect conversion electrons to avoid their coincidental detection with the alpha particles. Spectra taken at close range without a magnet system yielded biased results which cannot be fully compensated by statistical corrections for coincidence summing. The derived emission probabilities of the three main alpha decays are 94.07 (1)%, 5.93 (1)%, and 0.0059 (15)%, respectively. They are in excellent agreement with calculated values derived from the P(γ+ce) decay scheme balance, which solves the existing discrepancy problem with two previous direct measurements published in literature.
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Affiliation(s)
- M Marouli
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security, Retieseweg 111, B-2440 Geel, Belgium
| | - S Pommé
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security, Retieseweg 111, B-2440 Geel, Belgium.
| | - R Van Ammel
- European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security, Retieseweg 111, B-2440 Geel, Belgium
| | - E García-Toraño
- Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avenida Complutense 40, 28040 Madrid, Spain
| | - T Crespo
- Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avenida Complutense 40, 28040 Madrid, Spain
| | - S Pierre
- BNM-CEA/Laboratoire National Henri Becquerel, F-91191 Gif-sur-Yvette Cedex, France
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Duclos A, Peix JL, Piriou V, Occelli P, Denis A, Bourdy S, Carty MJ, Gawande AA, Debouck F, Vacca C, Lifante JC, Colin C, Aegerter P, Aouifi A, Arickx D, Aubart F, Baudrin D, Berry WR, Beuvry C, Bonnet F, Bouveret L, Cabarrot P, Cames E, Carty MJ, Caton J, Chenitz MC, Clergues F, Colin C, Coudray JM, Damiens M, Dauzac C, Debono B, Debouck F, De Germay B, Deleforterie AC, Denis A, Desrousseaux JF, Didelot MP, Doat B, Domingo-Saidji NY, Duclos A, Durieux P, Fessy M, Hardy P, Cariven P, Fontas N, Ganansia P, Gawande AA, Giraud F, Gostiaux G, Habi S, Haga S, Houlgatte A, Jaffe M, Jourdan J, Kaczmarek N, Lamblin S, Level C, Liaras E, Lifante JC, Lipsitz SR, Majchrzak C, Malavaud B, Serres TM, Martin X, Martinet C, Maupetit B, Michel P, Movondo A, Naamani B, Nacry R, Occelli P, Olousouzian S, Papin P, Paquet JC, Parfaite A, Pattou F, Paugam C, Pavy E, Peix JL, Petit H, Pierre S, Piriou V, Poupon Bourdy S, Pradere B, Quesne M, Radola Y, Raould A, Rongieras F, Rouquette I, Sanders V, Sanz F, Sens F, Surmont S, Sicre C, Tabur D, Targosz P, Thery D, Toppan N, Usandizaga G, Vacca C, Verheyde I, Zadegan F. Cluster randomized trial to evaluate the impact of team training on surgical outcomes. Br J Surg 2016; 103:1804-1814. [DOI: 10.1002/bjs.10295] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 05/07/2016] [Accepted: 07/15/2016] [Indexed: 11/10/2022]
Abstract
Abstract
Background
The application of safety principles from the aviation industry to the operating room has offered hope in reducing surgical complications. This study aimed to assess the impact on major surgical complications of adding an aviation-based team training programme after checklist implementation.
Methods
A prospective parallel-group cluster trial was undertaken between September 2011 and March 2013. Operating room teams from 31 hospitals were assigned randomly to participate in a team training programme focused on major concepts of crew resource management and checklist utilization. The primary outcome measure was the occurrence of any major adverse event, including death, during the hospital stay within the first 30 days after surgery. Using a difference-in-difference approach, the ratio of the odds ratios (ROR) was estimated to compare changes in surgical outcomes between intervention and control hospitals.
Results
Some 22 779 patients were enrolled, including 5934 before and 16 845 after team training implementation. The risk of major adverse events fell from 8·8 to 5·5 per cent in 16 intervention hospitals (adjusted odds ratio 0·57, 95 per cent c.i. 0·48 to 0·68; P < 0·001) and from 7·9 to 5·4 per cent in 15 control hospitals (odds ratio 0·64, 0·50 to 0·81; P < 0·001), resulting in the absence of difference between arms (ROR 0·90, 95 per cent c.i. 0·67 to 1·21; P = 0·474). Outcome trends revealed significant improvements among ten institutions, equally distributed across intervention and control hospitals.
Conclusion
Surgical outcomes improved substantially, with no difference between trial arms. Successful implementation of an aviation-based team training programme appears to require modification and adaptation of its principles in the context of the the surgical milieu. Registration number: NCT01384474 (http://www.clinicaltrials.gov).
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Affiliation(s)
- A Duclos
- Pôle Information Médicale Evaluation Recherche, Hospices Civils de Lyon, Lyon, France
- Health Services and Performance Research Laboratory, Université Claude Bernard Lyon 1, EA, 7425, Lyon, France
- Center for Surgery and Public Health, Brigham and Women's Hospital – Harvard Medical School, Boston, Massachusetts, USA
| | - J L Peix
- Service de Chirurgie Générale et Endocrinienne, Pierre Bénite, France
| | - V Piriou
- Health Services and Performance Research Laboratory, Université Claude Bernard Lyon 1, EA, 7425, Lyon, France
- Service d'Anesthésie Réanimation Médicale et Chirurgicale, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre Bénite, France
| | - P Occelli
- Pôle Information Médicale Evaluation Recherche, Hospices Civils de Lyon, Lyon, France
- Health Services and Performance Research Laboratory, Université Claude Bernard Lyon 1, EA, 7425, Lyon, France
| | - A Denis
- Pôle Information Médicale Evaluation Recherche, Hospices Civils de Lyon, Lyon, France
| | - S Bourdy
- Pôle Information Médicale Evaluation Recherche, Hospices Civils de Lyon, Lyon, France
| | - M J Carty
- Center for Surgery and Public Health, Brigham and Women's Hospital – Harvard Medical School, Boston, Massachusetts, USA
| | - A A Gawande
- Center for Surgery and Public Health, Brigham and Women's Hospital – Harvard Medical School, Boston, Massachusetts, USA
- Ariadne Labs and Harvard Chan School of Public Health, Boston, Massachusetts, USA
| | - F Debouck
- Air France Consulting, AFM42, Chambourcy, France
| | - C Vacca
- Coordination pour l'Evaluation des Pratiques Professionnelles en Santé en Rhône-Alpes, Lyon, France
| | - J C Lifante
- Health Services and Performance Research Laboratory, Université Claude Bernard Lyon 1, EA, 7425, Lyon, France
- Service de Chirurgie Générale et Endocrinienne, Pierre Bénite, France
| | - C Colin
- Pôle Information Médicale Evaluation Recherche, Hospices Civils de Lyon, Lyon, France
- Health Services and Performance Research Laboratory, Université Claude Bernard Lyon 1, EA, 7425, Lyon, France
| | | | | | | | | | - D Baudrin
- Agence Régional de Santé de Toulouse
| | | | | | - F Bonnet
- Assistance Publique-Hôpitaux de Paris
| | | | | | - E Cames
- Centre Hospitalier Universitaire de Toulouse
| | - M J Carty
- Brigham and Women's Hospital, Boston, Massachusetts, USA
| | - J Caton
- Clinique Emile Vialar de Lyon
| | | | | | | | | | | | - C Dauzac
- Assistance Publique-Hôpitaux de Paris
| | - B Debono
- Clinique des Cèdres de Cornebarrieu
| | | | | | | | | | | | | | | | | | | | - P Durieux
- Assistance Publique-Hôpitaux de Paris
| | | | - P Hardy
- Assistance Publique-Hôpitaux de Paris
| | | | - N Fontas
- Centre Hospitalier Universitaire de Toulouse
| | | | - A A Gawande
- Brigham and Women's Hospital, Boston, Massachusetts, USA
| | | | | | - S Habi
- Centre Hospitalier de Vienne
| | - S Haga
- Infirmerie Protestante de Lyon
| | - A Houlgatte
- Hôpital d'Instruction des Armées du Val de Grâce
| | - M Jaffe
- Clinique Ambroise Paré de Toulouse
| | | | | | | | - C Level
- Assistance Publique-Hôpitaux de Paris
| | - E Liaras
- Hôpital Privé de Natécia de Lyon
| | | | - S R Lipsitz
- Brigham and Women's Hospital, Boston, Massachusetts, USA
| | | | - B Malavaud
- Centre Hospitalier Régional Universitaire de Toulouse
| | | | | | | | | | | | | | | | | | | | | | - P Papin
- Centre Hospitalier de Villefranche sur Saône
| | | | | | - F Pattou
- Centre Hospitalier Régional Universitaire de Lille
| | - C Paugam
- Assistance Publique-Hôpitaux de Paris
| | - E Pavy
- Hôpital Simone Veil d'Eaubonne
| | | | | | - S Pierre
- Institut Claudius Régaud de Toulouse
| | | | | | - B Pradere
- Centre Hospitalier Régional Universitaire de Lille
| | | | - Y Radola
- Centre Hospitalier Régional Universitaire de Lille
| | - A Raould
- Assistance Publique-Hôpitaux de Paris
| | - F Rongieras
- Hôpital d'Instruction des Armées Desgenettes de Lyon
| | | | - V Sanders
- Centre Hospitalier Régional Universitaire de Lille
| | - F Sanz
- Centre Hospitalier Régional Universitaire de Lille
| | | | | | | | | | | | - D Thery
- Institut Catholique de Lille
| | - N Toppan
- Clinique de l'Union de Saint Jean
| | | | - C Vacca
- Coordination pour l'Evaluation des Pratiques Professionnelles en Santé en Rhône-Alpes de Lyon
| | | | - F Zadegan
- Assistance Publique-Hôpitaux de Paris
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13
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Sabot B, Pierre S, Michielsen N, Bondiguel S, Cassette P. A new thoron atmosphere reference measurement system. Appl Radiat Isot 2016; 109:205-209. [DOI: 10.1016/j.apradiso.2015.11.055] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 11/20/2015] [Indexed: 10/22/2022]
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14
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Sabot B, Pierre S, Cassette P, Michielsen N, Bondiguel S. Development of a primary thoron activity standard for the calibration of thoron measurement instruments. Radiat Prot Dosimetry 2015; 167:70-74. [PMID: 25911408 DOI: 10.1093/rpd/ncv221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The LNHB and IRSN are working on a reference atmosphere for thoron ((220)Rn) instrument calibration. The LNHB, as the national metrology institute for activity measurement in France, has to create a new thoron reference standard in order to estimate with accuracy the thoron concentration of a reference atmosphere. The measurement system presented in this paper is based on a reference volume using an alpha detector, which is able to measure thoron and its decay products to define the thoron concentration of a thoron reference atmosphere. This paper presents the first results with this new system using a well-known radon ((222)Rn) atmosphere and a thoron ((220)Rn) atmosphere.
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Affiliation(s)
- B Sabot
- CEA, LIST, LNHB, CEA Saclay, Gif-sur-Yvette F-91191, France Institut de Radioprotection et de Sûreté Nucléaire (IRSN) PSN-RES, SCA, LPMA, Centre de Saclay, Gif-sur-Yvette 91192, France
| | - S Pierre
- CEA, LIST, LNHB, CEA Saclay, Gif-sur-Yvette F-91191, France
| | - P Cassette
- CEA, LIST, LNHB, CEA Saclay, Gif-sur-Yvette F-91191, France
| | - N Michielsen
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN) PSN-RES, SCA, LPMA, Centre de Saclay, Gif-sur-Yvette 91192, France
| | - S Bondiguel
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN) PSN-RES, SCA, LPMA, Centre de Saclay, Gif-sur-Yvette 91192, France
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15
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Juricek L, Bui LC, Busi F, Pierre S, Guyot E, Lamouri A, Dupret JM, Barouki R, Rodrigues-Lima F, Coumoul X. O26: Les amines aromatiques : contaminants alimentaires caractérisés comme nouveaux activateurs du récepteur Ah. NUTR CLIN METAB 2014. [DOI: 10.1016/s0985-0562(14)70602-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Affiliation(s)
- B Vallet
- Pôle d'anesthésie réanimation, hôpital Huriez, CHRU de Lille, rue Polonovski, 59037 Lille cedex, France.
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17
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Pierre S, Scholich K. Pitolisant hydrochloride. DRUG FUTURE 2013. [DOI: 10.1358/dof.2013.038.02.1931055] [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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18
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Hamama L, Naouar A, Gala R, Voisine L, Pierre S, Jeauffre J, Cesbron D, Leplat F, Foucher F, Dorion N, Hibrand-Saint Oyant L. Overexpression of RoDELLA impacts the height, branching, and flowering behaviour of Pelargonium × domesticum transgenic plants. Plant Cell Rep 2012; 31:2015-29. [PMID: 22898902 DOI: 10.1007/s00299-012-1313-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Revised: 06/29/2012] [Accepted: 07/04/2012] [Indexed: 05/23/2023]
Abstract
KEY MESSAGE : We reported the cloning of a rose DELLA gene. We obtained transgenic Pelargonium lines overexpressing this gene which presented several phenotypes in plant growth, root growth, flowering time and number of inflorescences. Control of development is an important issue for production of ornamental plant. The plant growth regulator, gibberellins (GAs), plays a pivotal role in regulating plant growth and development. DELLA proteins are nuclear negative regulator of GA signalling. Our objective was to study the role of GA in the plant architecture and in the blooming of ornamentals. We cloned a rose DELLA homologous gene, RoDELLA, and studied its function by genetic transformation of pelargonium. Several transgenic pelargonium (Pelargonium × domesticum 'Autum Haze') lines were produced that ectopically expressed RoDELLA under the control of the 35S promoter. These transgenic plants exhibited a range of phenotypes which could be related to the reduction in GA response. Most of transgenic plants showed reduced growth associated to an increase of the node and branch number. Moreover, overexpression of RoDELLA blocked or delayed flowering in transgenic pelargonium and exhibited defects in the root formation. We demonstrated that pelargonium could be used to validate ornamental gene as the rose DELLA gene. RoDELLA overexpression modified many aspects of plant developmental pathways, as the plant growth, the transition of vegetative to floral stage and the ability of rooting.
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Affiliation(s)
- L Hamama
- Agrocampus Ouest, Institut de Recherche en Horticulture et Semences (INRA, Agrocampus-Ouest, Université d'Angers), SFR 149 QUASAV, PRES UNAM, 49045, Angers, France.
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19
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Hachfi L, Simide R, Richard S, Couvray S, Coupe S, Gaillard S, Pierre S, Grillasca JP, Prevot-D'Alvise N. Effect of water temperature increase on HO-1 expression in European sea bass (Dicentrarchus labrax L.) tissues. Cell Mol Biol (Noisy-le-grand) 2012; Suppl.58:OL1752-OL1756. [PMID: 22992441] [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] [Received: 06/24/2012] [Accepted: 09/07/2012] [Indexed: 06/01/2023]
Abstract
One of the most pertinent environmental factors influencing the marine organism life is temperature. It has been demonstrated that an increase of temperature is able to induce the synthesis of heat shock proteins (HSP). In this study we investigated the expression of HO-1 mRNA, also referred to as HSP32, in different tissues of European sea bass (Dicentrarchus labrax, L.) at several time points after increased temperature exposure (from 12degC to 30degC). Our results showed that HO-1 was not expressed in gills, heart, muscle and brain while it was expressed at a basal level in intestine. In liver, spleen and kidneys, HO-1 expression was influenced by temperature increases. In the spleen, we found a significant decrease of the HO-1 expression at the end of 4 weeks. In kidneys a very fast collapse of HO-1 expression level was recorded reaching null value as soon as one hour after exposure to 30degC. In liver, HO-1 expression increased from one hour of exposure to 30degC confirming HO-1 involvement to heat shock response in this organ. This increasing trend reached a 4.5-fold higher value than the initial level after 4 weeks.
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Affiliation(s)
- L Hachfi
- Équipe de Biologie Moléculaire Marine-PROTEE, Université du Sud Toulon-Var, BP 20132, Avenue de l’Université, 83957 La Garde Cedex, France
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20
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Bobin C, Bouchard J, Pierre S, Thiam C. Overview of a FPGA-based nuclear instrumentation dedicated to primary activity measurements. Appl Radiat Isot 2012; 70:2012-7. [DOI: 10.1016/j.apradiso.2012.02.068] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Accepted: 02/19/2012] [Indexed: 11/24/2022]
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21
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Wätjen U, Altzitzoglou T, Ceccatelli A, Dikmen H, Emteborg H, Ferreux L, Frechou C, La Rosa J, Luca A, Moreno Y, Oropesa P, Pierre S, Schmiedel M, Spasova Y, Szántó Z, Szücs L, Wershofen H, Yücel Ü. Results of an international comparison for the determination of radionuclide activity in bilberry material. Appl Radiat Isot 2012; 70:1843-9. [DOI: 10.1016/j.apradiso.2012.02.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Accepted: 02/16/2012] [Indexed: 10/28/2022]
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22
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Lépy MC, Altzitzoglou T, Anagnostakis MJ, Capogni M, Ceccatelli A, De Felice P, Djurasevic M, Dryak P, Fazio A, Ferreux L, Giampaoli A, Han JB, Hurtado S, Kandic A, Kanisch G, Karfopoulos KL, Klemola S, Kovar P, Laubenstein M, Lee JH, Lee JM, Lee KB, Pierre S, Carvalhal G, Sima O, Tao CV, Thanh TT, Vidmar T, Vukanac I, Yang MJ. Intercomparison of methods for coincidence summing corrections in gamma-ray spectrometry--part II (volume sources). Appl Radiat Isot 2012; 70:2112-8. [PMID: 22445105 DOI: 10.1016/j.apradiso.2012.02.079] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 02/20/2012] [Indexed: 11/16/2022]
Abstract
The second part of an intercomparison of the coincidence summing correction methods is presented. This exercise concerned three volume sources, filled with liquid radioactive solution. The same experimental spectra, decay scheme and photon emission intensities were used by all the participants. The results were expressed as coincidence summing corrective factors for several energies of (152)Eu and (134)Cs, and different source-to-detector distances. They are presented and discussed.
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Affiliation(s)
- M-C Lépy
- Laboratoire National Henri Becquerel (LNE-LNHB), CEA, LIST, F-91191 Gif-sur-Yvette cedex, France.
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23
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Pierre S, Tarnowska K, Hachfi L, Coupé S, Simide R, Couvray S, Garnier C, Grimaldi M, Richard S, Gaillard S, Prévot-D'Alvise N, Grillasca JP. Effects of water temperature increase and heavy metals contamination on WAP65 gene expression in sea bass (Dicentrarchus labrax) liver. Cell Mol Biol (Noisy-le-grand) 2011; 57 Suppl:OL1614-OL1622. [PMID: 22047796] [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] [Received: 09/14/2011] [Accepted: 10/18/2011] [Indexed: 05/31/2023]
Abstract
It has been previously demonstrated that "Warm temperature Acclimation-related 65 kD Protein" (WAP65) is involved in temperature acclimation, response to intoxication and infection, as well as in development. The expression of wap65-1 was investigated in the liver of European sea bass (Dicentrarchus labrax) during exposure to the increased temperature (from 12 deg C to 30 deg C) and during intoxication with four heavy metals: lead, cadmium, copper and zinc. Post temperature increase wap65 expression was highest after one hour at 30 deg C. After 1 to 4 weeks at 30 deg C wap65 transcript levels did not differ from the 12 deg C control group, similar to observations regarding the heat shock protein, hsp70. Upregulation of wap65 was detected after treatment (intoxication) with cadmium (0.5 μg/l). In contrast, a slight, but significant down regulation of wap65 was seen after copper (5 μg/l) intoxication. These data indicate that functional analyses of WAP65 are needed to understand the differential regulation of this gene by metals. The role of WAP65 may be similar to that of HSP70, which has generalized functions in responding to certain stressors and maintaining normal cell physiology.
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Affiliation(s)
- S Pierre
- Équipe de Biologie Moléculaire Marine-PROTEE, Université du Sud Toulon-Var, BP 20132, Avenue de l'Université, 83957 La Garde Cedex, France
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24
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Pierre S, Cassette P, Loidl M, Branger T, Lacour D, Le Garrérès I, Morelli S. On the variation of the 210Po half-life at low temperature. Appl Radiat Isot 2010; 68:1467-70. [DOI: 10.1016/j.apradiso.2009.11.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Pierre S, Bats A, Chevallier A, Bui L, Ambolet-Camoit A, Garlatti M, Aggerbeck M, Barouki R, Coumoul X. Induction of the Ras activator Son of Sevenless 1 by environmental pollutants mediates their effects on cellular proliferation. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.726] [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: 10/19/2022]
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26
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Pierre S, Coupé S, Prévot-d'Alvise N, Gaillard S, Richard S, Gouze E, Aubert J, Grillasca J. Cloning of Wap65 in sea bass (Dicentrarchus labrax) and sea bream (Sparus aurata) and expression in sea bass tissues. Comp Biochem Physiol B Biochem Mol Biol 2010; 155:396-402. [DOI: 10.1016/j.cbpb.2010.01.002] [Citation(s) in RCA: 14] [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] [Received: 07/21/2009] [Revised: 01/06/2010] [Accepted: 01/07/2010] [Indexed: 10/20/2022]
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Izard P, Pouymayou J, Chaminade B, Pierre S, Rougé P. 868 LONG LASTING LOCOREGIONAL ANAESTHESIA THROUGH INDWELLING CATHETER CONNECTED TO SUBCUTANEOUS PORT FOR CHRONIC CANCER PAIN RELIEF. Eur J Pain 2009. [DOI: 10.1016/s1090-3801(09)60871-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- P. Izard
- Institut Claudius Regaud, Toulouse, France
| | | | | | - S. Pierre
- Institut Claudius Regaud, Toulouse, France
| | - P. Rougé
- Institut Claudius Regaud, Toulouse, France
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28
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Pierre S, Figueiredo‐Pereira M. [P1.65]: Mouse model of Parkinson's disease mimicking neuroinflammation. Int J Dev Neurosci 2008. [DOI: 10.1016/j.ijdevneu.2008.09.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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29
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Prevot-D'Alvise N, Pierre S, Gaillard S, Gouze E, Gouze JN, Aubert J, Richard S, Grillasca JP. cDNA sequencing and expression analysis of Dicentrarchus labrax heme oxygenase-1. Cell Mol Biol (Noisy-le-grand) 2008; 54 Suppl:OL1046-OL1054. [PMID: 19116084] [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] [Received: 09/01/2008] [Accepted: 10/28/2008] [Indexed: 05/27/2023]
Abstract
The liver cDNA encoding heme oxygenase--1 (HO-1) was sequenced from European sea bass (Dicentrarchus labrax) (accession number no. EF139130). The HO-1 cDNA was 1250 bp in nucleotide length and the open reading frame encoded 277 amino acid residues. The deduced amino acid sequence of the European sea bass had 75% and 50% identity with the amino acid sequences of tetraodontiformes (Tetraodon nigroviridis and Takifugu rubripes) and human HO-1 proteins, respectively. A short hydrophobic transmembrane domain at the C--terminal region was found, and four histidine residues were highly conserved, including human his25 that is essential for HO catalytic activity. RT-PCR of mRNA from eight different European sea bass tissues revealed that, in a homeostatis state, the heme oxygenase--1 was abundant in the spleen and liver but not in the brain.
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Affiliation(s)
- N Prevot-D'Alvise
- Laboratoire PROTEE Toulon, Equipe de Biologie Moléculaire Marine, Université du Sud équipe de Biologie Moléculaire Marine-Var, France
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30
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Pierre S, Legault G. A genetic algorithm for designing distributed computer network topologies. IEEE Trans Syst Man Cybern B Cybern 2008; 28:249-58. [PMID: 18255943 DOI: 10.1109/3477.662766] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The topological design of distributed packet switched networks consists of finding a topology that minimizes the communication costs by taking into account a certain number of constraints such as the delay and the reliability. This paper proposes a genetic algorithm (GA) for generating low-cost feasible computer network topologies subject to these constraints. The implementation of this algorithm has been subjected to extensive tests in order to measure the quality of solutions. Computational results confirm the efficiency of the GA to provide good solutions for medium-sized computer networks, in comparison with well-tried conventional methods.
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Affiliation(s)
- S Pierre
- LICEF Res. Centre, Quebec Univ., Montreal, Que
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31
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Gnansounou E, Pierre S, Quintero A, Dong J, Lahlou A. A multi-agent approach for planning activities in decentralized electricity markets. Knowl Based Syst 2007. [DOI: 10.1016/j.knosys.2006.06.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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32
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Izard P, Pierre S, Pouymayou J, Laprie A, Rougé P. [Anaesthesia for cerebral radiotherapy: about 35 repeated intubations for a same 30 months old child]. Ann Fr Anesth Reanim 2006; 25:464. [PMID: 16361077 DOI: 10.1016/j.annfar.2005.11.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
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Abstract
AIM The purpose of this case report is to document an occurrence of spontaneous resolution of idiopathic retroperitoneal fibrosis and to review the investigation and management of this unusual condition. MATERIALS AND METHODS A detailed case summary of a patient with retroperitoneal fibrosis is presented. Current citations in Index medicus from the English-speaking literature of relevance to the topic were reviewed. CONCLUSIONS In this patient who refused open surgical intervention, bilateral stent placement allowed stabilization of renal function. CT-guided biopsy did not reveal malignancy. Serial CT imaging demonstrated gradual disappearance of the retroperitoneal mass. From the literature review, spontaneous resolution of this condition appears to be a rare phenomenon. Although often utilized, CT-guided biopsy may fail to exclude the presence of malignancy. Open surgical biopsy of the retroperitoneal mass and ureterolysis remain the standard of care for operative candidates. Establishing renal drainage and considering a trial of steroids or surveillance may be an option in carefully selected individuals.
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Affiliation(s)
- S Pierre
- Division of Urology, St Joseph's Health Care, London, Ontario, Canada
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Abstract
Using the yeast two-hybrid assay and the second of the two large cytosolic domains of type V adenylyl cyclase (ACV) as bait, we identified a small region (amino acids 1028-1231) in the protein associated with Myc (PAM) as an interaction site for ACV. This small region of PAM as well as purified full-length PAM inhibited the activity of ACV. Additionally, full-length PAM was a very potent inhibitor of ACI and AC activities in S49 cyc(-) cells and HeLa cells with IC(50) values in the pm and low nm range. Moreover, the regulator of chromatin condensation 1-like domain of PAM (amino acids 446-1062) was sufficient and as potent as full-length PAM at inhibiting the activity of ACV. Interestingly, full-length PAM did not inhibit ACII activity that was stimulated by either forskolin of Galpha(s). When endogenous levels of PAM in HeLa cells were decreased using antisense oligodeoxynucleotides, the basal cAMP content was elevated, and the dose-response curve for vasoactive intestinal peptide-elicited cAMP accumulation in HeLa cells was shifted to the left. Therefore, we conclude that PAM is a very potent, novel inhibitor of specific isoforms of AC. Furthermore, the regulator of chromatin condensation 1-like domain of PAM is sufficient to exert the effects of the full-length protein on AC and decreases in endogenous PAM levels in HeLa cells can modulate both basal and agonist stimulated cAMP accumulation.
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Affiliation(s)
- K Scholich
- Department of Pharmacology, University of Tennessee Health Science Center, 874 Union Ave., Memphis, TN 38163, USA
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Yigzaw Y, Cartin L, Pierre S, Scholich K, Patel TB. The C terminus of sprouty is important for modulation of cellular migration and proliferation. J Biol Chem 2001; 276:22742-7. [PMID: 11279012 DOI: 10.1074/jbc.m100123200] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Drosophila Sprouty (SPRY) protein has been shown to inhibit the actions of epidermal growth factor and fibroblast growth factor. However, the role of mammalian SPRY proteins has not been clearly elucidated. We postulated that human Sprouty2 (hSPRY2) is an inhibitor of cellular migration and proliferation. Indeed, using stably transfected HeLa cells, which expressed hemagglutinin (HA)-tagged hSPRY2 or hSPRY2 tagged at the C terminus with red fluorescent protein, we demonstrated that hSPRY2 inhibits the migration of cells in response to serum, epidermal growth factor, fibroblast growth factor, and platelet-derived growth factor. Additionally, hSPRY2 also inhibited the growth of HeLa cells in response to serum. Previously, two C-terminal domains on hSPRY2, which are necessary for its colocalization with microtubules (residues 123-177) or translocation to membrane ruffles (residues 178-194), have been identified (Lim, J., Wong, E. S., Ong, S. H., Yusoff, P., Low, B. C., and Guy, G. R. (2000) J. Biol. Chem. 275, 32837-32845). Therefore, using TAT-tagged hSPRY2 and its mutants, we determined the role of these two C-terminal domains in the inhibition of cell migration and proliferation. Our data show that the deletion of either of these two regions in hSPRY2 abrogates its ability to modulate cell migration in response to different growth factors and proliferation in response to serum. Therefore, we conclude that hSPRY2 inhibits the actions of a number of growth factors, and its C terminus, which is homologous among various SPRY isoforms, is important in mediating its biological activity.
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Affiliation(s)
- Y Yigzaw
- Department of Pharmacology and the Vascular Biology Center of Excellence, The Health Science Center University of Tennessee, Memphis, Tennessee 38163, USA
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36
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Abstract
Signal transduction through the cell membrane requires the participation of one or more plasma membrane proteins. For many transmembrane signaling events adenylyl cyclases (ACs) are the final effector enzymes which integrate and interpret divergent signals from different pathways. The enzymatic activity of adenylyl cyclases is stimulated or inhibited in response to the activation of a large number of receptors in virtually all cells of the human body. To date, ten different mammalian isoforms of adenylyl cyclase (AC) have been cloned and characterized. Each isoform has its own distinct tissue distribution and regulatory properties, providing possibilities for different cells to respond diversely to similar stimuli. The product of the enzymatic reaction catalyzed by ACs, cyclic AMP (cAMP) has been shown to play a crucial role for a variety of fundamental physiological cell functions ranging from cell growth and differentiation, to transcriptional regulation and apoptosis. In the past, investigations into the regulatory mechanisms of ACs were limited by difficulties associated with their purification and the availability of the proteins in any significant amount. Moreover, nearly every cell expresses several AC isoforms. Therefore, it was difficult to perform biochemical characterization of the different AC isoforms and nearly impossible to assess the physiological roles of the individual isoforms in intact cells, tissue or organisms. Recently, however, different molecular biological approaches have permitted several breakthroughs in the study of ACs. Recombinant technologies have allowed biochemical analysis of adenylyl cyclases in-vitro and the development of transgenic animals as well as knock-out mice have yielded new insights in the physiological role of some AC isoforms. In this review, we will focus mainly on the most novel approaches and concepts, which have delineated the mechanisms regulating AC and unravelled novel functions for this enzyme.
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Affiliation(s)
- T B Patel
- Department of Pharmacology and the Vascular Biology Center of Excellence, University of Tennessee, Memphis, 874 Union Avenue, Memphis, TN 38163, USA.
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Maggiorini M, Mélot C, Pierre S, Pfeiffer F, Greve I, Sartori C, Lepori M, Hauser M, Scherrer U, Naeije R. High-altitude pulmonary edema is initially caused by an increase in capillary pressure. Circulation 2001; 103:2078-83. [PMID: 11319198 DOI: 10.1161/01.cir.103.16.2078] [Citation(s) in RCA: 305] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND High-altitude pulmonary edema (HAPE) is characterized by severe pulmonary hypertension and bronchoalveolar lavage fluid changes indicative of inflammation. It is not known, however, whether the primary event is an increase in pressure or an increase in permeability of the pulmonary capillaries. METHODS AND RESULTS We studied pulmonary hemodynamics, including capillary pressure determined by the occlusion method, and capillary permeability evaluated by the pulmonary transvascular escape of 67Ga-labeled transferrin, in 16 subjects with a previous HAPE and in 14 control subjects, first at low altitude (490 m) and then within the first 48 hours of ascent to a high-altitude laboratory (4559 m). The HAPE-susceptible subjects, compared with the control subjects, had an enhanced pulmonary vasoreactivity to inspiratory hypoxia at low altitude and higher mean pulmonary artery pressures (37 +/- 2 versus 26 +/- 1 mmHg, P<0.001) and pulmonary capillary pressures (19 +/- 1 versus 13 +/- 1 mmHg, P < 0.001) at high altitude. Nine of the susceptible subjects developed HAPE. All of them had a pulmonary capillary pressure >19 mm Hg (range 20 to 26 mmHg), whereas all 7 susceptible subjects without HAPE had a pulmonary capillary pressure < 19 mm Hg (range 14 to 18 mm Hg). The pulmonary transcapillary escape of radiolabeled transferrin increased slightly from low to high altitude in the HAPE-susceptible subjects but remained within the limits of normal and did not differ significantly from the control subjects. CONCLUSIONS HAPE is initially caused by an increase in pulmonary capillary pressure.
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Affiliation(s)
- M Maggiorini
- Department of Internal Medicine, UniversitätsSpital, Zürich, Switzerland.
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Pierre S, Compe E, Grillasca JP, Plannells R, Sampol J, Pressley TA, Maixent JM. RT-PCR detection of Na,K-ATPase subunit isoforms in human umbilical vein endothelial cells (HUVEC): evidence for the presence of alpha1 and beta3. Cell Mol Biol (Noisy-le-grand) 2001; 47:319-24. [PMID: 11355007] [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: 04/16/2023]
Abstract
The endothelial Na,K-ATPase is an active component in maintaining a variety of normal vascular functions. The enzyme is characterized by a complex molecular heterogeneity that results from differential expression and association of multiple isoforms of both its alpha- and beta-subunits. The aim of the present study was to determine which isoforms of the Na,K-ATPase are expressed in human endothelial cells. HUVEC (human umbilical vein endothelial cells) were used as a model of well known human endothelial cells. The high sensitive method RT-PCR was used with primers specific for the various isoforms of the alpha- and beta-subunits of the Na,K-ATPase. The results show that HUVEC express alpha1-, but not alpha2-, alpha3- or alpha4-isoforms of the catalytic subunit and that beta3- but not beta2- or beta1-isoforms is present in these cells. These findings are in contradiction with our previous detection of Na,K-ATPase isoforms in HUVEC using antibodies (14). Such results raise the technical problem of the specificity of the available antibodies directed against the different isoforms as well as the question of the physiological relevance of the diversity of the Na,K-ATPase isoforms.
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Affiliation(s)
- S Pierre
- Laboratoire de Biochimie Fondamentale, Moléculaire et Clinique, UFR de Pharmacie, Marseille, France
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Pierre S, Paganelli F, Sennoune S, Roche R, Schwinger RH, Mesana T, Maixent JM. RT-PCR detection of the Na,K-ATPase beta3-isoform in human heart. Cell Mol Biol (Noisy-le-grand) 2001; 47:261-4. [PMID: 11354999] [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: 04/16/2023]
Abstract
The Na,K-ATPase is a heterodimer composed of an alpha-catalytic and a beta-glycoprotein subunit. At present, three different alpha-polypeptides (alpha1, alpha2, alpha3) and two distinct beta-isoforms (beta1 and beta2) have been detected in human heart. The aim of the present study was to determine whether or not the beta3-isoform of the Na,K-ATPase can be detected in human heart. Using the highly sensitive method of RT-PCR, we here show that human heart expresses the beta3-isoform of the Na,K-ATPase. Given the differences in pharmacological properties of the nine different Na,K-ATPase isoenzymes (containing all combinations of the subunit isoforms), the study of beta3-isoform regulation in human heart may be of interest in understanding the altered response of human myocardium to digitalis therapy during heart failure.
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Affiliation(s)
- S Pierre
- Laboratoire de Biochimie Fondamentale, Moléculaire et Clinique, UFR de Pharmacie, Marseille, France
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40
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Abstract
OBJECTIVE We tested the hypothesis that carbon monoxide might participate in the modulation of hypoxic pulmonary vasoconstriction (HPV) by prostacyclin (PGI2) and nitric oxide. DESIGN Prospective, interventional study. SETTING University laboratory. SUBJECTS Nineteen intact anesthetized mongrel dogs. INTERVENTIONS Right heart catheterization for the measurements of mean pulmonary artery pressure (Ppa), left atrial pressure estimated from occluded Ppa (Ppao), pulmonary capillary pressure (Pcp) calculated from the Ppa decay curve after balloon occlusion, and cardiac output (Q); inferior vena cava balloon for the control of Q by manipulation of venous return; ventilation in hyperoxia (fraction of inspired O2, 0.4) or in hypoxia (Fio2, 0.1); inhibition of cyclooxygenase by indomethacin (Indo); inhibition of nitric oxide synthase by NG-nitro-l-arginine (L-NA); inhibition of heme oxygenase by mesoporphyrin IX (SnMP); inhalation of nitric oxide (20 ppm); and inhalation of carbon monoxide (100 ppm). MEASUREMENTS AND MAIN RESULTS The first seven dogs were weak responders to hypoxia as assessed by a hypoxia-induced increase in the gradient between Ppa and Ppao, measured at one level of Q kept constant, by an average of only 2 mm Hg (p = NS). This HPV was markedly increased by the combined administration of Indo and L-NA. A further enhancement of HPV was observed after the addition of SnMP, leading to severe pulmonary hypertension with an average increase in Ppa to 39 mm Hg. Inhaled nitric oxide inhibited HPV only after the combined administration of Indo, L-NA, and SnMP. Inhaled carbon monoxide had no effect. The next 12 dogs were stronger responders to hypoxia, as assessed by a hypoxia-induced increase in the gradient between Ppa and Ppao, measured at several levels of Q, by an average of 3 mm Hg (p <.05). This HPV was of the same magnitude after administration of placebo (n = 6) or SnMP (n = 6). Addition of Indo enhanced HPV to the same extent in the placebo and in the SnMP groups. Addition of L-NA induced a further enhancement of HPV, which was, however, greater in the SnMP group. There was a slight increase in the capillary-venous segment relative to the arterial segment in hypoxic conditions, but the partitioning of pulmonary vascular resistance was otherwise unaffected by nitric oxide, carbon monoxide, or PGI2. CONCLUSIONS Endogenous carbon monoxide modulates canine HPV only in the absence of nitric oxide. The vasodilation mediated by nitric oxide, PGI2, or carbon monoxide is essentially distributed between proximal and distal sites proportionally to the degree of constriction produced during hypoxia.
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Affiliation(s)
- F Vassalli
- Laboratory of Physiology, Free University of Brussels School of Medicine, Brussels, Belgium
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Allemann Y, Sartori C, Lepori M, Pierre S, Mélot C, Naeije R, Scherrer U, Maggiorini M. Echocardiographic and invasive measurements of pulmonary artery pressure correlate closely at high altitude. Am J Physiol Heart Circ Physiol 2000; 279:H2013-6. [PMID: 11009492 DOI: 10.1152/ajpheart.2000.279.4.h2013] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Exaggerated hypoxia-induced pulmonary hypertension is a hallmark of high-altitude pulmonary edema (HAPE) and plays a major role in its pathogenesis. Many studies of HAPE have estimated systolic pulmonary arterial pressure (SPAP) with Doppler echocardiography. Whereas at low altitude, Doppler echocardiographic estimation of SPAP correlates closely with its invasive measurement, no such evidence exists for estimations obtained at high altitude, where alterations of blood viscosity may invalidate the simplified Bernoulli equation. We measured SPAP by Doppler echocardiography and invasively in 14 mountaineers prone to HAPE and in 14 mountaineers resistant to this condition at 4,559 m. Mountaineers prone to HAPE had more pronounced pulmonary hypertension (57 +/- 12 and 58 +/- 10 mmHg for noninvasive and invasive determination, respectively; means +/- SD) than subjects resistant to HAPE (37 +/- 8 and 37 +/- 6 mmHg, respectively), and the values measured in the two groups as a whole covered a wide range of pulmonary arterial pressures (30-83 mmHg). Spearman test showed a highly significant correlation (r = 0.89, P < 0.0001) between estimated and invasively measured SPAP values. The mean difference between invasively measured and Doppler-estimated SPAP was 0.5 +/- 8 mmHg. At high altitude, estimation of SPAP by Doppler echocardiography is an accurate and reproducible method that correlates closely with its invasive measurement.
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Affiliation(s)
- Y Allemann
- Swiss Cardiovascular Center Bern, University of Bern, 3010 Bern, Switzerland.
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Benfradj A, Labescat H, Marchalant G, Métivier MT, Nadreau M, Pierre S, Roswag D. [Taking care of the child with movement disorders]. Soins Pediatr Pueric 2000:16-9. [PMID: 11288354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- A Benfradj
- Hôpital Robert-Debré, service de neurologie/maladies métaboliques, 75019 Paris
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Barbey O, Pierre S, Duran MJ, Sennoune S, Lévy S, Maixent JM. Specific up-regulation of mitochondrial F0F1-ATPase activity after short episodes of atrial fibrillation in sheep. J Cardiovasc Electrophysiol 2000; 11:432-8. [PMID: 10809497 DOI: 10.1111/j.1540-8167.2000.tb00339.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Ventricular fibrillation induced by either digitalis intoxication or electrical stimulation is reported to alter myocardial energy by impairing the sarcolemmal Na,K-ATPase or the receptor for digitalis and the mitochondrial ATPase synthase or F0F1-ATPase. However, little is known about these membrane functions during atrial fibrillation (AF). METHODS AND RESULTS We analyzed the effects of electrically induced AF on biochemical activities of atrial F0F1-ATPase and Na,K-ATPase in sheep. A group of six sheep was subjected to direct short electrical stimulation of the right atrium to induce AF. Sham-operated sheep served as a control group. Microsomal and mitochondrial membranes of atrial muscle were isolated and tested for enzymatic activity. All paced sheep developed multiple episodes of sustained AF, with a mean total duration of 110 minutes over a 2-hour period. Data showed that short-term pacing-induced AF significantly activated membrane F0F1-ATPase activity (P < 0.05) without changes in cytochrome-c oxidase activity, Na,K-ATPase activity, ouabain sensitivity, and alpha1-subunit expression. CONCLUSION Specific activation of F0F1-ATPase activity is an early molecular consequence of sustained AF in sheep.
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Affiliation(s)
- O Barbey
- Laboratoire de Recherche Cardiologique, University of Marseille, School of Medicine, Centre Hospitalo-Universitaire Nord, France
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Maixent JM, Barbey O, Pierre S, Duran MJ, Sennoune S, Bourdeaux M, Ricard P, Lévy S. Inhibition of Na,K-ATPase by external electrical cardioversion in a sheep model of atrial fibrillation. J Cardiovasc Electrophysiol 2000; 11:439-45. [PMID: 10809498 DOI: 10.1111/j.1540-8167.2000.tb00340.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Electrical external cardioversion commonly used to treat atrial fibrillation (AF) is associated with myocardial membrane damage and disturbances in ionic homeostasis (hemodynamically unstable). The present study was designed to investigate whether alterations in ionic homeostasis observed were due in part to changes in the myocardial activity of Na,K-ATPase. METHODS AND RESULTS AF was induced by pacing in ten anesthetized sheep divided into two groups. Group I (n = 4) received a single external countershock of 360 J after three episodes of AF lasting 10 minutes. Group II (n = 6) served as controls. Activity, responsiveness to ouabain, and membrane expression of catalytic alpha and beta subunits of Na,K-ATPase in sarcolemmal myocardial membrane fractions were investigated. Membrane fluidity and fatty acid composition, and plasma levels of atrial natriuretic factor (ANF) also were measured. One shock after episodes of AF significantly decreased ventricular Na,K-ATPase activity up to 50% (P < 0.001) without modification of atrial activity at the membrane level. Sites with low affinity to ouabain showed a fivefold lower affinity for ouabain in the cardioversion group than in the control group (IC50 = 7.9 micromol/L vs 40 micromol/L ouabain, P < 0.05). Plasma levels of ANF were significantly increased in the cardioversion group compared with the control group. These changes were independent of membrane modulation in terms of expression of Na,K-ATPase, membrane fluidity, and fatty acid composition. CONCLUSION This study suggests that left ventricular perturbation of ionic homeostasis subsequent to transthoracic cardioversion could result from inactivation of Na,K-ATPase activity.
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Affiliation(s)
- J M Maixent
- Laboratoire de Recherche Cardiologique, University of Marseille, School of Medicine, Centre Hospitalo-Universitaire Nord, France.
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Sennoune S, Gerbi A, Duran MJ, Grillasca JP, Compe E, Pierre S, Planells R, Bourdeaux M, Vague P, Pieroni G, Maixent JM. Effect of streptozotocin-induced diabetes on rat liver Na+/K+-ATPase. Eur J Biochem 2000; 267:2071-8. [PMID: 10727947 DOI: 10.1046/j.1432-1327.2000.01211.x] [Citation(s) in RCA: 19] [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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Na+/K+-ATPase during diabetes may be regulated by synthesis of its alpha and beta subunits and by changes in membrane fluidity and lipid composition. As these mechanisms were unknown in liver, we studied in rats the effect of streptozotocin-induced diabetes on liver Na+/K+-ATPase. We then evaluated whether fish oil treatment prevented the diabetes-induced changes. Diabetes mellitus induced an increased Na+/K+-ATPase activity and an enhanced expression of the beta1 subunit; there was no change in the amount of the alpha1 and beta3 isoenzymes. Biphasic ouabain inhibition curves were obtained for diabetic groups indicating the presence of low and high affinity sites. No alpha2 and alpha3 isoenzymes could be detected. Diabetes mellitus led to a decrease in membrane fluidity and a change in membrane lipid composition. The diabetes-induced changes are not prevented by fish oil treatment. The results suggest that the increase of Na+/K+-ATPase activity can be associated with the enhanced expression of the beta1 subunit in the diabetic state, but cannot be attributed to changes in membrane fluidity as typically this enzyme will increase in response to an enhancement of membrane fluidity. The presence of a high-affinity site for ouabain (IC50 = 10-7 M) could be explained by the presence of (alphabeta)2 diprotomeric structure of Na+/K+-ATPase or an as yet unknown alpha subunit isoform that may exist in diabetes mellitus. These stimulations might be related, in part, to the modification of fatty acid content during diabetes.
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Affiliation(s)
- S Sennoune
- Laboratoire de Recherche Cardiologique, Faculté de Medecine Nord, Marseille, France
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Gerbi A, Sennoune S, Pierre S, Sampol J, Raccah D, Vague P, Maixent JM. Localization of Na,K-ATPase alpha/beta isoforms in rat sciatic nerves: effect of diabetes and fish oil treatment. J Neurochem 1999; 73:719-26. [PMID: 10428069 DOI: 10.1046/j.1471-4159.1999.0730719.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The localization of the Na,K-ATPase isoenzymes in sciatic nerve remains controversial, as well as diabetes-induced changes in Na,K-ATPase isoforms. Some of these changes could be prevented by fish oil therapy. The aim of this study was to determine by confocal microscopy the distribution of Na,K-ATPase isoforms (alpha1, alpha2, alpha3, beta1, and beta2) in the sciatic nerve, the changes induced by diabetes, and the preventive effect of fish oil in diabetic neuropathy. This study was performed in three groups of rats. In the first two groups, diabetes was induced by streptozotocin and rats were supplemented daily with fish oil or olive oil at a dosage of 0.5 g/kg of body weight. The third one was a control group that was supplemented with olive oil. Five antibodies against specific epitopes of Na,K-ATPase isoenzymes were applied to stained dissociated nerve fibers with fluorescent secondary antibodies. The five isoenzymes were documented in nonspecific regions, Schwann cells (myelin), and the node of Ranvier. The localization of the alpha1, alpha2, and beta1 isoenzymes was not affected by diabetes. In contrast, diabetes induced a decrease of the alpha2 subunit (p < 0.05) and an up-regulation of the beta2 subunit (p < 0.05). These modifications were noted in both regions for alpha2 and were localized at the myelin domain only for the beta2. Fish oil supplementation prevented the diabetes-induced changes in the alpha2 subunit with an additional up-regulation. The beta2 subunit was not modified. A phenotypic change similar to nerve injury was induced by diabetes. Fish oil supplementation partially prevented some of these changes.
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Affiliation(s)
- A Gerbi
- Laboratoire de Recherche Cardiologique, Faculté de Médecine, CHU Timone, France
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48
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Sennoune S, Gerbi A, Duran MJ, Benkoël L, Pierre S, Lambert R, Dodero F, Chamlian A, Vague P, Maixent JM. A quantitative immunocytochemical study of Na+,K+-ATPase in rat hepatocytes after STZ-induced diabetes and dietary fish oil supplementation. J Histochem Cytochem 1999; 47:809-16. [PMID: 10330457 DOI: 10.1177/002215549904700610] [Citation(s) in RCA: 6] [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: 01/19/2023] Open
Abstract
Because diabetes causes alterations in hepatic membrane fatty acid content, these changes may affect the Na+,K+-ATPase. In this study we documented the effects of streptozotocin (STZ)-induced diabetes on hepatic Na+,K+-ATPase catalytic alpha1-subunit and evaluated whether these changes could be normalized by fish oil supplementation. Two groups of diabetic rats received fish oil or olive oil supplementation. Both groups had a respective control group. We studied the localization of catalytic alpha1-subunit on bile canalicular and basolateral membranes using immunocytochemical methods and confocal laser scanning microscopy, and the Na+, K+-ATPase activity, membrane fluidity, and fatty acid composition on isolated hepatic membranes. A decrease in the alpha1-subunit was observed with diabetes in the bile canalicular membranes, without changes in basolateral membranes. This decrease was partially prevented by dietary fish oil. Diabetes induces significant changes as documented by enzymatic Na+,K+-ATPase activity, membrane fluidity, and fatty acid content, whereas little change in these parameters was observed after a fish oil diet. In conclusion, STZ-induced diabetes appears to modify bile canalicular membrane integrity and dietary fish oil partly prevents the diabetes-induced alterations.
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Affiliation(s)
- S Sennoune
- Laboratoire de Recherche Cardiologique, Faculté de Médecine Nord
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Pierre S, Agorom C. Respectability. Nurs Manag (Harrow) 1999; 6:7-8. [PMID: 10382517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Affiliation(s)
- S Pierre
- University Hospital, Aintree, Liverpool
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50
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Abstract
Neuroprotective drugs such as Ginkgo biloba extract (EGb 761) could prevent the ischemia-induced impairment of the Na,K-ATPase activity. In this study, Na,K-ATPase activity and expression, contents in fatty acids and malondialdehyde, an index of lipoperoxidation, were compared in the ipsilateral (ischemic) and the contralateral (unlesioned) cortices after 1 h of unilateral focal cortices cerebral ischemia in the mouse. EGb 761 (110 mg/kg) was administered daily to half of the animals for 10 days before ischemia. Ischemia significantly reduced Na,K-ATPase activity by about 40% and increased malondialdehyde content; EGb 761 pretreatment abolished these effects. The free radical scavenger properties of EGb 761 are a potential mechanism by which Na,K-ATPase injury and lipoperoxidation are prevented.
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Affiliation(s)
- S Pierre
- Laboratoire de Recherche Cardiologique, Université de la Méditerranée, Faculté de Médecine, I.F.R. Jean Roche, Marseille, France
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