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Czarnecka J, Neuschwander A, Aujoulat T, Balmier A, Belcour D, Boulanger B, Bourgain C, Caron M, Kiss G, Larghi M, Lebard C, Mellano V, Larson J, Megroian B, Lefrançois A, Fox S, Pollet A, Bourgoin P, Biland G, Braunberger E, Maccio G, Delmas B. Red Blood Cell Transfusion Requirements Before and After Implementation of a Perioperative Patient Blood Management Program in Adult Patients Undergoing Cardiac Surgery. A Before and After Observational Study. J Cardiothorac Vasc Anesth 2024; 38:73-79. [PMID: 37953174 DOI: 10.1053/j.jvca.2023.10.023] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 10/12/2023] [Accepted: 10/16/2023] [Indexed: 11/14/2023]
Abstract
OBJECTIVES Anemia and transfusion are common in cardiac surgery patients, and are associated with significant morbidity and mortality. Multiple perioperative interventions have been described to reduce blood transfusion, but are rarely combined altogether. The aim of this study was to compare the incidence of red blood cell (RBC) transfusion in adult patients undergoing cardiac surgery before and after the implementation of a perioperative patient blood management (PBM) program. DESIGN Before-and-after observational study. SETTING Single-center French university teaching hospital. PARTICIPANTS Adult patients scheduled for cardiac surgery. INTERVENTIONS Perioperative patient blood management program including pre-, intra-, and postoperative interventions aimed at identifying and correcting anemia, minimizing blood loss during surgery, and optimizing coagulation. MEASUREMENTS AND MAIN RESULTS Four hundred thirty-four patients were included in the study from January 2021 to July 2022. The incidence of perioperative RBC transfusion (intraoperatively and during the first 2 postoperative days) was significantly reduced from 43% (90/213) in the pre-PBM period to 27% (60/221) in the post-PBM period (p < 0.001). The application of a PBM program was associated with a reduction in perioperative RBC transfusion by multivariate analysis (odds ratio 0.55, 95% CI 0.36-0.85, p = 0.007), and was associated with a reduction in the median number of RBC units transfused within transfused patients (p = 0.025). These effects persisted at day 30 after surgery (p = 0.029). CONCLUSION A perioperative PBM program in adult patients undergoing cardiac surgery was associated with a significant reduction in perioperative RBC transfusion, which persisted at day 30.
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Affiliation(s)
- Jeremie Czarnecka
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Arthur Neuschwander
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France.
| | - Thomas Aujoulat
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Adrien Balmier
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Dominique Belcour
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Boris Boulanger
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Caroline Bourgain
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Margot Caron
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Gabor Kiss
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Mathilde Larghi
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Christophe Lebard
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Vincent Mellano
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Jonathan Larson
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Blandine Megroian
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Anaelle Lefrançois
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Sylvain Fox
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Arnaud Pollet
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Pierre Bourgoin
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France; Department of anesthesiology, University Hospital, Nantes, France
| | - Guillaume Biland
- Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Eric Braunberger
- Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Guillaume Maccio
- French Blood Establishment, Felix Guyon University Hospital, Saint-Denis, Reunion, France
| | - Benjamin Delmas
- Department of Anaesthesia and Critical Care for Cardiovascular and Thoracic Surgery, Felix Guyon University Hospital, Saint-Denis, Reunion, France
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Santos P, Chakraborty N, Salz T, Curry M, Vicioso NL, Mathis NJ, Caron M, Ostroff J, Guttman D, Salner AL, Panoff JE, McIntosh AF, Pfister DG, Yang JT, Snyderman AL, Gillespie EF. Implementation Outcomes of Strategies to Promote Short-Course Radiation for Nonspine Bone Metastases in an Academic-Community Partnership: Survey Results from the ALIGNMENT Trial. Int J Radiat Oncol Biol Phys 2023; 117:S124-S125. [PMID: 37784321 DOI: 10.1016/j.ijrobp.2023.06.466] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Local treatment of nonspine bone metastases has become increasingly complex, resulting in physician practice variability nationwide. The purpose of this study was to assess physician perceptions of 3 implementation strategies to promote adoption of short course radiotherapy (RT) for nonspine bone metastases. MATERIALS/METHODS ALIGNMENT ("Alliance Group for Bone Metastasis") was a multi-institutional stepped wedge cluster randomized implementation trial testing strategies to increase use of ≤5 fractions for nonspine bone metastases conducted across 3 clinical sites in an academic-community partnership. Strategies included a) multidisciplinary consensus guidelines, b) e-Consults, an email-based consultation platform, and c) personalized audit and feedback (A&F) reports with peer comparison. Using the Proctor et al. framework and validated questions from Weiner et al., physician surveys were used to assess each strategy's usefulness, acceptability (i.e., "I welcome [strategy]"), appropriateness (i.e., "[strategy] seems like a good match"), and feasibility (i.e., "[strategy] seems implementable" or "easy to use"). Survey responses were anonymized, so Fisher's Exact test was used to compare proportions with significance set at p<0.05. RESULTS Overall, 29 of 38 and 30 of 38 physicians participated in the pre- and post-implementation surveys, respectively, with 80% completing both. Pre-implementation, guidelines was most often ranked 1st in terms of usefulness (61%), followed by eConsults (38%) and A&F (3%). Post-implementation, guidelines and eConsults had the most and least favorable acceptability, appropriateness, and feasibility scores, respectively (Table), with 77% of physicians being likely to recommend the guidelines to other oncologists. In contrast, while 43% of physicians reported having at least 1 difficult clinical question regarding bone metastases during the study, only 33% of physicians preferred eConsults, while 50% preferred reaching out to a friend/colleague. Lastly, although A&F had the lowest perceived usefulness pre-implementation, A&F had the greatest increase in acceptability (72%→90%; p = 0.10), appropriateness (66%→90%; p = 0.03) feasibility ("implementable": 59%→93%, p = 0.002; "easy to use": 45%→93%, p<0.001). CONCLUSION In this multicenter trial, all strategies were acceptable, appropriate, and feasible, with guidelines and A&F showing the most favorable outcomes post-implementation. While guidelines were assessed as the most useful, A&F had significant increases in appropriateness and feasibility.
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Affiliation(s)
- P Santos
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY; Harvard T.H. Chan School of Public Health, Boston, MA
| | - N Chakraborty
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY
| | - T Salz
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY
| | - M Curry
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY
| | - N Ledesma Vicioso
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY
| | - N J Mathis
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY
| | - M Caron
- Strategic Partnerships, Memorial Sloan Kettering Cancer Center, New York, NY
| | - J Ostroff
- Department of Psychiatry and Behavioral Sciences, Memorial Sloan Kettering Cancer Center, New York, NY
| | - D Guttman
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY
| | - A L Salner
- Hartford HealthCare Cancer Institute, Hartford, CT
| | - J E Panoff
- Department of Radiation Oncology, Miami Cancer Institute, Baptist Health South Florida, Miami, FL
| | - A F McIntosh
- Allentown Radiation Oncology Associates, Allentown, PA, United States
| | - D G Pfister
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY
| | - J T Yang
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY; Department of Radiation Oncology, University of Washington, Seattle, WA
| | - A Lipitz Snyderman
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY
| | - E F Gillespie
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY; Department of Radiation Oncology, University of Washington, Seattle, WA
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3
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Puech B, Legrand A, Simon O, Combe C, Jaffar-Bandjee MC, Caron M, Vidal C, Mavingui P, Blonde R, Boue Y, Berguigua H, Allyn J, Bruneau L, Ferdynus C, Allou N. Prognosis of patients with acute respiratory failure due to the SARS-CoV-2 501Y.V2 variant: a multicenter retrospective matched cohort study. Sci Rep 2022; 12:8747. [PMID: 35610307 PMCID: PMC9128319 DOI: 10.1038/s41598-022-12767-4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 05/12/2022] [Indexed: 12/15/2022] Open
Abstract
The aim of this study was to compare the prognosis of patients with acute respiratory failure (ARF) due to the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant 501Y.V2 to that of patients with ARF due to the original strain. This retrospective matched cohort study included all consecutive patients who were hospitalized for ARF due to SARS-CoV-2 in Reunion Island University Hospital between March 2020 and March 2021. Twenty-eight in hospital mortality was evaluated before and after matching. A total of 218 patients with ARF due to SARS-CoV-2 were enrolled in the study. Of these, 83 (38.1%) were infected with the 501Y.V2 variant. During intensive care unit stay, 104 (47.7%) patients received invasive mechanical ventilation and 20 (9.2%) patients were supported by venovenous extracorporeal membrane oxygenation. Patients infected with the 501Y.V2 variant were younger (58 [51–68] vs. 67 [56–74] years old, P = 0.003), had less hypertension (54.2% vs 68.1%, P = 0.04), and had less chronic kidney disease (13.3% vs. 31.9%, P = 0.002) than patients infected with the original strain. After controlling for confounding variables (62 matched patients in each group), 28-day mortality was higher in the group of patients infected with the 501Y.V2 variant (30.6%) than in the group of patients infected with the original strain (19.4%, P = 0.04). In Reunion Island, where SARS-CoV-2 incidence remained low until February 2021 and the health care system was never saturated, mortality was higher in patients with ARF infected with the 501Y.V2 variant than in patients infected with the original strain.
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Affiliation(s)
- Bérénice Puech
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Antoine Legrand
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Olivier Simon
- Hôpital Universitaire Sud Réunion, Réanimation Polyvalente, Avenue François Mitterand BP 350, 97448, Saint Pierre Cedex, France
| | - Chloé Combe
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | | | - Margot Caron
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Charles Vidal
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Patrick Mavingui
- UMR Processus Infectieux en Milieu Insulaire Tropical (PIMIT) INSERM 1187, CNRS, Paris, France
| | - Renaud Blonde
- Intensive Care Unit, Centre Hospitalier de Mayotte, rue de l'Hôpital, 97600, Mamoudzou, Mayotte, France
| | - Yvonnick Boue
- Intensive Care Unit, Centre Hospitalier de Mayotte, rue de l'Hôpital, 97600, Mamoudzou, Mayotte, France
| | - Hamza Berguigua
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Jérôme Allyn
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France.,Département d'Informatique Clinique, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Léa Bruneau
- Unité de Soutien Méthodologique, Centre Hospitalier Universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Cyril Ferdynus
- Département d'Informatique Clinique, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France.,Unité de Soutien Méthodologique, Centre Hospitalier Universitaire Félix Guyon, La Réunion, Saint-Denis, France.,INSERM, CIC 1410, Saint-Pierre, France
| | - Nicolas Allou
- Hôpital Universitaire Félix Guyon, Réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France. .,Département d'Informatique Clinique, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France.
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4
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de Mangou A, Combe A, Coolen-Allou N, Miltgen G, Traversier N, Belmonte O, Vandroux D, Bohrer M, Cousty J, Caron M, Vidal C, Allyn J, Allou N. Severe community-acquired pneumonia in Reunion Island: Epidemiological, clinical, and microbiological characteristics, 2016–2018. PLoS One 2022; 17:e0267184. [PMID: 35427402 PMCID: PMC9012352 DOI: 10.1371/journal.pone.0267184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 04/04/2022] [Indexed: 12/17/2022] Open
Abstract
Purpose No data are available on severe community-acquired pneumonia (CAP) in the French overseas department of Reunion Island. This is unfortunate as the microorganisms responsible for the disease are likely to differ from those in temperate regions due to a tropical climate and proximity to other islands of the Indian Ocean region. The aim of this study was to assess the epidemiological, clinical, prognosis, and microbiological characteristics of patients with severe CAP in Reunion Island. Materials and methods This retrospective study evaluated all patients with CAP aged >18 years and hospitalized in one of the two intensive care units of Reunion Island between 2016 and 2018. Microorganisms were identified by culture from blood and respiratory samples, multiplex polymerase chain reaction from respiratory samples, urinary antigen tests, and serology. Results Over the study period, 573 cases of severe CAP were recorded, with a mean incidence of 22 per 100,000 person-years. The most frequently isolated microorganism was influenza (21.9%) followed by Streptococcus pneumoniae (12%). The influenza virus was detected in affected patients all year round. Twenty-four patients with severe CAP came from another island of the Indian Ocean region (4.2%), mainly Madagascar (>50%). Two of these patients presented with melioidosis and 4 were infected with Acinetobacter spp. Conclusions Our findings have major implications for the management of severe CAP in tropical regions. The most frequently isolated microorganism in patients with severe CAP in Reunion Island is influenza followed by S. pneumoniae. Physicians should be aware that influenza is the main cause of severe CAP in patients living in or returning from Reunion Island, where this virus circulates all year round.
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Affiliation(s)
- Axel de Mangou
- Intensive Care Unit, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - Agathe Combe
- Intensive Care Unit, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - Nathalie Coolen-Allou
- Respiratory Disease, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - Guillaume Miltgen
- Microbiology, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
- UMR Processus Infectieux en Milieu Insulaire Tropical, CNRS 9192, INSERM U1187, IRD 249, Université de la Réunion, Saint-Denis, France
| | - Nicolas Traversier
- Microbiology, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - Olivier Belmonte
- Microbiology, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - David Vandroux
- Intensive Care Unit, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - Michel Bohrer
- Department of Medical Information, Saint-Denis University Hospital, Saint-Denis, Reunion Island, France
| | - Julien Cousty
- Intensive Care Unit, Centre Hospitalier Universitaire Sud Réunion, Saint-Pierre, France
| | - Margot Caron
- Intensive Care Unit, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - Charles Vidal
- Intensive Care Unit, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
| | - Jérôme Allyn
- Intensive Care Unit, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
- Clinical Informatic Department, Saint-Denis University Hospital, Saint-Denis, Reunion Island, France
| | - Nicolas Allou
- Intensive Care Unit, Centre Hospitalier Universitaire Felix Guyon, Saint-Denis, France
- Clinical Informatic Department, Saint-Denis University Hospital, Saint-Denis, Reunion Island, France
- * E-mail:
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5
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Berguigua H, Iche L, Roche P, Aubert C, Blondé R, Legrand A, Puech B, Combe C, Vidal C, Caron M, Jaffar-Bandjee MC, Caralp C, Oulehri N, Kerambrun H, Allyn J, Boué Y, Allou N. Emergency air evacuation of patients with acute respiratory failure due to SARS-CoV-2 from Mayotte to Reunion Island. Medicine (Baltimore) 2021; 100:e27881. [PMID: 35049190 PMCID: PMC9191376 DOI: 10.1097/md.0000000000027881] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 11/03/2021] [Indexed: 11/26/2022] Open
Abstract
In February 2021, an explosion of cases of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pneumonia overwhelmed the only hospital in Mayotte. To report a case series of patients with acute respiratory failure (ARF) due to SARS-CoV-2 who were evacuated by air from Mayotte to Reunion Island.This retrospective observational study evaluated all consecutive patients with ARF due to SARS-CoV-2 who were evacuated by air from Mayotte Hospital to the intensive care unit (ICU) of Félix Guyon University Hospital in Reunion Island between February 2, and March 5, 2021.A total of 43 patients with SARS-CoV-2 pneumonia were evacuated by air, for a total flight time of 2 hours and a total travel time of 6 hours. Of these, 38 patients (88.4%) with a median age of 55 (46-65) years presented with ARF and were hospitalized in our ICU. Fifteen patients were screened for the SARS-CoV-2 501Y.V2 variant, all of whom tested positive. Thirteen patients (34.2%) developed an episode of severe hypoxemia during air transport, and the median paO2/FiO2 ratio was lower on ICU admission (140 [102-192] mmHg) than on departure (165 [150-200], P = .022). Factors associated with severe hypoxemia during air transport was lack of treatment with curare (P = .012) and lack of invasive mechanical ventilation (P = .003). Nine patients (23.7%) received veno-venous extracorporeal membrane oxygenation support in our ICU. Seven deaths (18.4%) occurred in hospital.Emergency air evacuation of patients with ARF due to SARS-CoV-2 was associated with severe hypoxemia but remained feasible. In cases of ARF due to SARS-CoV-2 requiring emergency air evacuation, sedated patients receiving invasive mechanical ventilation and curare should be prioritized over nonintubated patients. It is noteworthy that patients with SARS-CoV-2 pneumonia related to the 501Y.V2 variant were very severe despite their young age.
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Affiliation(s)
- Hamza Berguigua
- Department of Emergency, Center Hospitalier Universitaire Felix Guyon, Saint Denis, France
| | - Ludovic Iche
- Department of Emergency, Center Hospitalier de Mayotte, Mamoudzou, France
| | - Philippe Roche
- Department of Emergency, Center Hospitalier de Mayotte, Mamoudzou, France
| | - Cyril Aubert
- Department of Emergency, Center Hospitalier Universitaire Felix Guyon, Saint Denis, France
| | - Renaud Blondé
- Réanimation Polyvalente, Center Hospitalier de Mayotte, Mamoudzou, France
| | - Antoine Legrand
- Réanimation polyvalente, Center Hospitalier Universitaire Felix Guyon Allée des Topazes Saint Denis, France
| | - Bérénice Puech
- Réanimation polyvalente, Center Hospitalier Universitaire Felix Guyon Allée des Topazes Saint Denis, France
| | - Chloé Combe
- Réanimation polyvalente, Center Hospitalier Universitaire Felix Guyon Allée des Topazes Saint Denis, France
| | - Charles Vidal
- Réanimation polyvalente, Center Hospitalier Universitaire Felix Guyon Allée des Topazes Saint Denis, France
| | - Margot Caron
- Réanimation polyvalente, Center Hospitalier Universitaire Felix Guyon Allée des Topazes Saint Denis, France
| | | | - Christophe Caralp
- Department of Emergency, Center Hospitalier de Mayotte, Mamoudzou, France
| | - Nora Oulehri
- Department of Emergency, Center Hospitalier de Mayotte, Mamoudzou, France
| | - Hugo Kerambrun
- Réanimation Polyvalente, Center Hospitalier de Mayotte, Mamoudzou, France
| | - Jérôme Allyn
- Réanimation polyvalente, Center Hospitalier Universitaire Felix Guyon Allée des Topazes Saint Denis, France
- Département d’Informatique Clinique, Centre Hospitalier Universitaire Felix Guyon Allée des Topazes, Saint Denis, France
| | - Yvonnick Boué
- Réanimation Polyvalente, Center Hospitalier de Mayotte, Mamoudzou, France
| | - Nicolas Allou
- Réanimation polyvalente, Center Hospitalier Universitaire Felix Guyon Allée des Topazes Saint Denis, France
- Département d’Informatique Clinique, Centre Hospitalier Universitaire Felix Guyon Allée des Topazes, Saint Denis, France
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6
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Puech B, Canivet C, Teysseyre L, Miltgen G, Aujoulat T, Caron M, Combe C, Jabot J, Martinet O, Allyn J, Ferdynus C, Allou N. Effect of antibiotic therapy on the prognosis of ventilator-associated pneumonia caused by Stenotrophomonas maltophilia. Ann Intensive Care 2021; 11:160. [PMID: 34825962 PMCID: PMC8626555 DOI: 10.1186/s13613-021-00950-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 11/12/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Ventilator-associated pneumonia (VAP) caused by Stenotrophomonas maltophilia is poorly described in the literature. However, it has been shown to be associated with increased morbidity and mortality. Probabilistic antibiotic therapy against S. maltophilia is often ineffective as this pathogen is resistant to many antibiotics. There is no consensus at present on the best therapeutic strategy to adopt (class of antibiotics, antibiotic combination, dosage, treatment duration). The aim of this study was to evaluate the effect of antibiotic therapy strategy on the prognosis of patients with VAP caused by S. maltophilia. RESULTS This retrospective study evaluated all consecutive patients who developed VAP caused by S. maltophilia between 2010 and 2018 while hospitalized in the intensive care unit (ICU) of a French university hospital in Reunion Island, in the Indian Ocean region. A total of 130 patients with a median Simplified Acute Physiology Score II of 58 [43-73] had VAP caused by S. maltophilia after a median duration of mechanical ventilation of 12 [5-18] days. Ventilator-associated pneumonia was polymicrobial in 44.6% of cases, and ICU mortality was 50.0%. After multivariate Cox regression analysis, the factors associated with increased ICU mortality were older age (hazard ratio (HR): 1.03; 95% CI 1.01-1.04, p = 0.001) and high Sequential Organ Failure Assessment score on the day of VAP onset (HR: 1.08; 95% CI 1.03-1.14, p = 0.002). Appropriate antibiotic therapy, and in particular trimethoprim-sulfamethoxazole, was associated with decreased ICU mortality (HR: 0.42; 95% CI 0.24-0.74, p = 0.003) and decreased hospital mortality (HR: 0.47; 95% CI 0.28-0.79, p = 0.04). Time to start of appropriate antibiotic therapy, combination therapy, and duration of appropriate antibiotic therapy had no effect on ICU mortality (p > 0.5). CONCLUSION In our study, appropriate antibiotic therapy, and in particular trimethoprim-sulfamethoxazole, was associated with decreased ICU and hospital mortality in patients with VAP caused by S. maltophilia.
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Affiliation(s)
- Bérénice Puech
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France.
| | - Clémence Canivet
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Laura Teysseyre
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Guillaume Miltgen
- Service de Microbiologie, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
- UMR Processus Infectieux en Milieu Insulaire Tropical (PIMIT), CNRS 9192, INSERM U1187, IRD 249, Université de La Réunion, Saint-Denis, France
| | - Thomas Aujoulat
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Margot Caron
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Chloé Combe
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Julien Jabot
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Olivier Martinet
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Jerome Allyn
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
- Département d'Informatique Clinique, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Cyril Ferdynus
- Département d'Informatique Clinique, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
| | - Nicolas Allou
- Réanimation Polyvalente, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
- Département d'Informatique Clinique, Hôpital Universitaire Félix Guyon, Allée des Topazes, 97400, Saint Denis, France
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7
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Legault LM, Doiron K, Breton-Larrivée M, Langford-Avelar A, Lemieux A, Caron M, Jerome-Majewska LA, Sinnett D, McGraw S. Pre-implantation alcohol exposure induces lasting sex-specific DNA methylation programming errors in the developing forebrain. Clin Epigenetics 2021; 13:164. [PMID: 34425890 PMCID: PMC8381495 DOI: 10.1186/s13148-021-01151-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 08/11/2021] [Indexed: 12/26/2022] Open
Abstract
Background Prenatal alcohol exposure is recognized for altering DNA methylation profiles of brain cells during development, and to be part of the molecular basis underpinning Fetal Alcohol Spectrum Disorder (FASD) etiology. However, we have negligible information on the effects of alcohol exposure during pre-implantation, the early embryonic window marked with dynamic DNA methylation reprogramming, and on how this may rewire the brain developmental program. Results Using a pre-clinical in vivo mouse model, we show that a binge-like alcohol exposure during pre-implantation at the 8-cell stage leads to surge in morphological brain defects and adverse developmental outcomes during fetal life. Genome-wide DNA methylation analyses of fetal forebrains uncovered sex-specific alterations, including partial loss of DNA methylation maintenance at imprinting control regions, and abnormal de novo DNA methylation profiles in various biological pathways (e.g., neural/brain development). Conclusion These findings support that alcohol-induced DNA methylation programming deviations during pre-implantation could contribute to the manifestation of neurodevelopmental phenotypes associated with FASD. Supplementary Information The online version contains supplementary material available at 10.1186/s13148-021-01151-0.
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Affiliation(s)
- L M Legault
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, QC, H3T 1J4, Canada
| | - K Doiron
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada
| | - M Breton-Larrivée
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, QC, H3T 1J4, Canada
| | - A Langford-Avelar
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, QC, H3T 1J4, Canada
| | - A Lemieux
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, QC, H3T 1J4, Canada
| | - M Caron
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada
| | - L A Jerome-Majewska
- McGill University Health Centre Glen Site, 1001 Boulevard Décarie, Montréal, QC, H4A 3J1, Canada.,Department of Pediatrics, McGill University, 1001 Boulevard Décarie, Montréal, QC, H4A 3J1, Canada
| | - D Sinnett
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada.,Department of Pediatrics, Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, QC, H3T 1J4, Canada
| | - S McGraw
- CHU Sainte-Justine Research Center, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, QC, H3T 1C5, Canada. .,Department of Biochemistry and Molecular Medicine, Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, QC, H3T 1J4, Canada. .,Department of Obstetrics and Gynecology, Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, QC, H3T 1J4, Canada.
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8
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Lecadieu A, Teysseyre L, Larsen K, Vidal C, Caron M, Traversier N, Aujoulat T, Allyn J, Allou N. Case Report: Transmission of Dengue Virus from a Deceased Donor to a Kidney Transplant Recipient Previously Infected by Dengue Virus. Am J Trop Med Hyg 2021; 104:2199-2201. [PMID: 33939641 DOI: 10.4269/ajtmh.21-0137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 03/05/2021] [Indexed: 12/21/2022] Open
Abstract
Since 2018, a dengue epidemic has been ongoing in the French overseas department of Reunion Island, in the Indian Ocean, with more than 25,000 serologically confirmed cases. Currently, three dengue serotypes have been identified in Réunion Island (DENV-1, DENV-2, and DENV-3) progressing in the form of epidemic outbreaks. This arbovirus is mainly transmitted by mosquitoes of the genus Aedes and may be responsible for serious clinical forms. To date, very few cases of kidney transplant-related dengue virus infection have been described. Here we report the first case of severe dengue virus infection related to kidney transplantation from a patient previously infected with dengue. Testing for dengue fever with PCR search in donor's urine may help complete the pretransplant assessment in areas where this disease occurs.
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Affiliation(s)
- Arnaud Lecadieu
- 1Centre Hospitalier Universitaire Félix Guyon, réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Laura Teysseyre
- 1Centre Hospitalier Universitaire Félix Guyon, réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Kevin Larsen
- 1Centre Hospitalier Universitaire Félix Guyon, réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Charles Vidal
- 1Centre Hospitalier Universitaire Félix Guyon, réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Margot Caron
- 1Centre Hospitalier Universitaire Félix Guyon, réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Nicolas Traversier
- 2Centre Hospitalier Universitaire Félix Guyon, Service de Microbiologie, Allée des Topazes, 97400, Saint Denis, France
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- 3Centre Hospitalier Universitaire Félix Guyon, Service de Néphrologie, Allée des Topazes, 97400, Saint Denis, France
| | - Thomas Aujoulat
- 4Centre Hospitalier Universitaire Félix Guyon, Service de Réanimation de chirurgie cardio-thoracique, Allée des Topazes, 97400, Saint Denis, France
| | - Jérôme Allyn
- 1Centre Hospitalier Universitaire Félix Guyon, réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
| | - Nicolas Allou
- 1Centre Hospitalier Universitaire Félix Guyon, réanimation Polyvalente, Allée des Topazes, 97400, Saint Denis, France
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9
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Caron M, Parrot A, Elabbadi A, Dupeyrat S, Turpin M, Baury T, Rozencwajg S, Blayau C, Fulgencio JP, Gibelin A, Blanchard PY, Rodriguez S, Daigné D, Allain MC, Fartoukh M, Pham T. Pain and dyspnea control during awake fiberoptic bronchoscopy in critically ill patients: safety and efficacy of remifentanil target-controlled infusion. Ann Intensive Care 2021; 11:48. [PMID: 33725225 PMCID: PMC7966657 DOI: 10.1186/s13613-021-00832-6] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 03/02/2021] [Indexed: 12/13/2022] Open
Abstract
Purpose Flexible fiberoptic bronchoscopy is frequently used in intensive care unit, but is a source of discomfort, dyspnea and anxiety for patients. Our objective was to assess the feasibility and tolerance of a sedation using remifentanil target-controlled infusion, to perform fiberoptic bronchoscopy in awake ICU patients. Materials, patients and methods This monocentric, prospective observational study was conducted in awake patients requiring fiberoptic bronchoscopy. In accordance with usual practices in our center, remifentanil target-controlled infusion was used under close monitoring and adapted to the patient’s reactions. The primary objective was the rate of successful procedures without additional analgesia or anesthesia. The secondary objectives were clinical tolerance and the comfort of patients (graded from “very uncomfortable” to “very comfortable”) and operators (numeric scale from 0 to 10) during the procedure. Results From May 2014 to December 2015, 72 patients were included. Most of them (69%) were hypoxemic and admitted for acute respiratory failure. No additional medication was needed in 96% of the patients. No severe side-effects occurred. Seventy-eight percent of patients described the procedure as “comfortable or very comfortable”. Physicians rated their comfort with a median [IQR] score of 9 [8–10]. Conclusion Remifentanil target-controlled infusion administered to perform awake fiberoptic bronchoscopy in critically ill patients is feasible without requirement of additional analgesics or sedative drugs. Clinical tolerance as well as patients’ and operators’ comfort were good to excellent. This technique could benefit patients’ experience. Supplementary Information The online version contains supplementary material available at 10.1186/s13613-021-00832-6.
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Affiliation(s)
- Margot Caron
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Antoine Parrot
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Alexandre Elabbadi
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Sophie Dupeyrat
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Matthieu Turpin
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Thomas Baury
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Sacha Rozencwajg
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Clarisse Blayau
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Jean-Pierre Fulgencio
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Aude Gibelin
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Pierre-Yves Blanchard
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Séverine Rodriguez
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Daisy Daigné
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Marie-Cécile Allain
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France
| | - Muriel Fartoukh
- Sorbonne Université, Assistance Publique - Hôpitaux de Paris, Service de médecine intensive réanimation, Hôpital Tenon, Paris, France.,Groupe de Recherche Clinique GRC05 CARMAS, Institut Mondor de recherche biomédicale, INSERM, Créteil, France
| | - Tài Pham
- Université Paris-Saclay, AP-HP, Service de médecine intensive-réanimation, Hôpital de Bicêtre, DMU CORREVE, FHU SEPSIS, Groupe de recherche clinique CARMAS, Le Kremlin-Bicêtre, France.
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10
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Lecadieu A, Veyret S, Persichini R, Duarte L, Caron M, Vidal C, Bordet E, Traversier N, Allyn J, Allou N. Case Report: Refractory Acute Respiratory Distress Syndrome Supported by Extracorporeal Membrane Oxygenation due to Coinfection with Chlamydia pneumoniae and Leptospirosis in Reunion Island. Am J Trop Med Hyg 2021; 104:866-867. [PMID: 33399045 DOI: 10.4269/ajtmh.20-1186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 11/09/2020] [Indexed: 11/07/2022] Open
Abstract
Infection with Leptospira spp. is common in Réunion, a tropical island in the Indian Ocean. However, respiratory coinfections between strains of Leptospira spp. and other microorganisms are rarely described. Here, we describe the first reported case of coinfection between Leptospira spp. and Chlamydia pneumoniae, responsible for refractory acute respiratory distress syndrome requiring extracorporeal membrane oxygenation with a favorable outcome. In a case of leptospirosis with severe respiratory illness, testing for respiratory coinfection, especially with atypical pathogens, could explain the seriousness of the clinical condition and lead to specific treatment.
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Affiliation(s)
- Arnaud Lecadieu
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Simon Veyret
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Romain Persichini
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Lucie Duarte
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Margot Caron
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Charles Vidal
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Elora Bordet
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Nicolas Traversier
- Service de Microbiologie, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Jérôme Allyn
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
| | - Nicolas Allou
- Réanimation Polyvalente, Centre Hospitalier Universitaire Félix Guyon, Saint Denis, France
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11
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Legault LM, Doiron K, Lemieux A, Caron M, Chan D, Lopes FL, Bourque G, Sinnett D, McGraw S. Developmental genome-wide DNA methylation asymmetry between mouse placenta and embryo. Epigenetics 2020; 15:800-815. [PMID: 32056496 PMCID: PMC7518706 DOI: 10.1080/15592294.2020.1722922] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 01/03/2020] [Accepted: 01/15/2020] [Indexed: 12/27/2022] Open
Abstract
In early embryos, DNA methylation is remodelled to initiate the developmental program but for mostly unknown reasons, methylation marks are acquired unequally between embryonic and placental cells. To better understand this, we generated high-resolution DNA methylation maps of mouse mid-gestation (E10.5) embryo and placenta. We uncovered specific subtypes of differentially methylated regions (DMRs) that contribute directly to the developmental asymmetry existing between mid-gestation embryonic and placental DNA methylation patterns. We show that the asymmetry occurs rapidly during the acquisition of marks in the post-implanted conceptus (E3.5-E6.5), and that these patterns are long-lasting across subtypes of DMRs throughout prenatal development and in somatic tissues. We reveal that at the peri-implantation stages, the de novo methyltransferase activity of DNMT3B is the main driver of methylation marks on asymmetric DMRs, and that DNMT3B can largely compensate for lack of DNMT3A in the epiblast and extraembryonic ectoderm, whereas DNMT3A can only partially compensate in the absence of DNMT3B. However, as development progresses and as DNMT3A becomes the principal de novo methyltransferase, the compensatory DNA methylation mechanism of DNMT3B on DMRs becomes less effective.
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Affiliation(s)
- LM Legault
- Research Center of the CHU Sainte-Justine, Montreal, Canada
- Department of Biochemistry and Molecular Medicine, Université De Montréal, Montreal, Canada
| | - K Doiron
- Research Center of the CHU Sainte-Justine, Montreal, Canada
| | - A Lemieux
- Research Center of the CHU Sainte-Justine, Montreal, Canada
- Department of Biochemistry and Molecular Medicine, Université De Montréal, Montreal, Canada
| | - M Caron
- Research Center of the CHU Sainte-Justine, Montreal, Canada
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - D Chan
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - FL Lopes
- School of Veterinary Medicine, São Paulo State University (Unesp), Aracatuba, Brazil
| | - G Bourque
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada
- McGill University and Genome Quebec Innovation Centre, Montreal, Quebec, Canada
- Canadian Center for Computational Genomics, Montreal, Quebec, Canada
| | - D Sinnett
- Research Center of the CHU Sainte-Justine, Montreal, Canada
- Department of Pediatrics, Université De Montréal, Montreal, Canada
| | - S McGraw
- Research Center of the CHU Sainte-Justine, Montreal, Canada
- Department of Biochemistry and Molecular Medicine, Université De Montréal, Montreal, Canada
- Department of Obstetrics and Gynecology, Université De Montréal, Montreal, Canada
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12
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Charpentier T, Ferdynus C, Lair T, Cordier C, Brulliard C, Valance D, Emery M, Caron M, Allou N, Allyn J. Bleeding risk of ticagrelor compared to clopidogrel in intensive care unit patients with acute coronary syndrome: A propensity-score matching analysis. PLoS One 2020; 15:e0232768. [PMID: 32365100 PMCID: PMC7197796 DOI: 10.1371/journal.pone.0232768] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 04/21/2020] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Intensive care unit (ICU) patients with the most severe forms of acute coronary syndrome (ACS) require invasive therapies such as extracorporeal life support. The risk of bleeding in ICU patients with ACS treated with a dual antiplatelet therapy of aspirin and ticagrelor is unknown. The primary objective of this study was to compare the bleeding risk of ticagrelor and clopidogrel in ICU patients with ACS. METHODS AND FINDINGS We conducted a retrospective study based on a propensity score and a proportional hazards model. All patients with ACS hospitalized in the ICU of a French university hospital between January 2013 and January 2017 were included in the study. Bleeding during ICU stay was defined as all Thrombolysis in myocardial infarction (TIMI) major or minor events. A total of 155 patients were included in the study. According to propensity score matching, 57 patients treated with aspirin and ticagrelor were matched with 57 patients treated with aspirin and clopidogrel. Median (first-third quartile) Simplified Acute Physiology Score II was 61.5 (41.0-85.0). Bleeding during ICU stay occurred in 12 patients (21.1%) treated with clopidogrel and in 35 patients (61.4%) treated with ticagrelor (p<0.0001). This significant association was found for both TIMI major bleeding (12.3% vs. 35.1%, p = 0.004) and TIMI minor bleeding (8.8% vs. 26.3%, p = 0.01). The relative risk of bleeding occurrence during ICU stay was 2.60 (confidence interval 95%: 1.55-4.35) for ticagrelor compared to clopidogrel. No significant difference in ICU mortality was found between the two groups (45.6% in the clopidogrel group vs. 29.8% in the ticagrelor group, p = 0.08). CONCLUSIONS Bleeding complications are frequent and serious in ICU patients with ACS. A dual antiplatelet therapy of aspirin and ticagrelor is associated with a higher risk of bleeding compared to a dual antiplatelet therapy of aspirin and clopidogrel.
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Affiliation(s)
- Thibault Charpentier
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Cyril Ferdynus
- Unité de Soutien Méthodologique, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
- INSERM, CIC 1410, Saint-Pierre, France
- Département d’Informatique Clinique, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Thomas Lair
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Charlotte Cordier
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Caroline Brulliard
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Dorothée Valance
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Malo Emery
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Margot Caron
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Nicolas Allou
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
- Département d’Informatique Clinique, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
| | - Jérôme Allyn
- Réanimation Polyvalente, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
- Département d’Informatique Clinique, Centre hospitalier universitaire Félix Guyon, La Réunion, Saint-Denis, France
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13
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Caron M, Lamarre G, Grégoire P, Simonyan D, Laflamme N. A244 THE FECAL IMMUNOCHEMICAL TEST (FIT): SELECTED ASPECTS REGARDING ITS EFFECTIVENESS FOR COLORECTAL CANCER SCREENING IN QUEBEC CITY. J Can Assoc Gastroenterol 2018. [DOI: 10.1093/jcag/gwy008.245] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M Caron
- Faculty of Medicine, Universite Laval, Quebec, QC, Canada
| | - G Lamarre
- Faculty of Medicine, Universite Laval, Quebec, QC, Canada
| | | | - D Simonyan
- Centre de recherche du CHU de Québec, Quebec, QC, Canada
| | - N Laflamme
- Centre de recherche du CHU de Québec, Quebec, QC, Canada
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14
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Caron M, Bédard L, Latreille J, Buckeridge DL. An exploratory analysis of individuals with multiple episodes of different reportable diseases, Montreal, 1990-2012. Public Health 2015; 131:49-55. [PMID: 26715312 DOI: 10.1016/j.puhe.2015.10.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 08/28/2015] [Accepted: 10/29/2015] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Studies of public health reporting have only examined multiple episodes of the same communicable disease within an individual. We aimed to characterize Montreal residents with multiple reportable disease episodes from 1990 to 2012, while accounting for all types of reportable diseases. STUDY DESIGN Retrospective cohort study. METHODS We performed an exploratory analysis using descriptive statistics, contingency tables, and logistic regression. RESULTS There were 157,839 individuals with at least one disease report and a total of 179,455 disease reports. The 9.8% of subjects with more than one episode accounted for 20.7% of all reported episodes. Among subjects with four or fewer episodes, 54.0% were women, while 74.3% of subjects with five or more episodes were men. Subjects with multiple episodes were more likely to be reported for sexually transmitted infections than were persons with a single episode [difference of proportions: 10.4% (95% CI: 10.0%-10.9%)] and to reside in the neighbourhood encompassing Montreal's gay village. CONCLUSIONS Individuals with multiple communicable disease reports place a large burden on public health officials. These results may help guide investigation and prevention efforts to reduce the number of excess episodes.
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Affiliation(s)
- M Caron
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada
| | - L Bédard
- Direction de santé publique, CIUSSS du Centre-Est-de-l'Île-de-Montréal, Montreal, QC, Canada; École de santé publique, Université de Montréal, Montreal, QC, Canada
| | - J Latreille
- Direction de santé publique, CIUSSS du Centre-Est-de-l'Île-de-Montréal, Montreal, QC, Canada
| | - D L Buckeridge
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada; Direction de santé publique, CIUSSS du Centre-Est-de-l'Île-de-Montréal, Montreal, QC, Canada.
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15
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Castrejon I, Carmona L, Agrinier N, Andres M, Briot K, Caron M, Christensen R, Consolaro A, Curbelo R, Ferrer M, Foltz V, Gonzalez C, Guillemin F, Machado PM, Prodinger B, Ravelli A, Scholte-Voshaar M, Uhlig T, van Tuyl LHD, Zink A, Gossec L. The EULAR Outcome Measures Library: development and an example from a systematic review for systemic lupus erythematous instruments. Clin Exp Rheumatol 2015; 33:910-916. [PMID: 25797345] [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: 08/22/2014] [Accepted: 01/09/2015] [Indexed: 06/04/2023]
Abstract
OBJECTIVES Patient reported outcomes (PROs) are relevant in rheumatology. Variable accessibility and validity of commonly used PROs are obstacles to homogeneity in evidence synthesis. The objective of this project was to provide a comprehensive library of "validated PROs". METHODS A launch meeting with rheumatologists, PROs methodological experts, and patients, was held to define the library's aims and scope, and basic requirements. To feed the library we performed systematic reviews on selected diseases and domains. Relevant information on PROs was collected using standardised data collection forms based on the COSMIN checklist. RESULTS The EULAR Outcomes Measures Library (OML), whose aims are to provide and to advise on PROs on a user-friendly manner albeit based on scientific grounds, has been launched and made accessible to all. PROs currently included cover any domain and, are generic or specifically target to the following diseases: rheumatoid arthritis, osteoarthritis, spondyloarthritis, low back pain, systemic lupus erythematosus, gout, osteoporosis, juvenile idiopathic arthritis, and fibromyalgia. Up to 236 instruments (106 generic and 130 specific) have been identified, evaluated, and included. The systematic review for SLE, which yielded 10 specific instruments, is presented here as an example. The OML website includes, for each PRO, information on the construct being measured and the extent of validation, recommendations for use, and available versions; it also contains a glossary on common validation terms. CONCLUSIONS The OML is an in progress library led by rheumatologists, related professionals and patients, that will help to better understand and apply PROs in rheumatic and musculoskeletal diseases.
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Affiliation(s)
- I Castrejon
- Division of Rheumatology, Rush University Medical Center, Chicago, USA.
| | - L Carmona
- Instituto de Salud Musculoesquelética, Madrid, Spain
| | - N Agrinier
- University of Lorraine, APEMAC EA 4360, Nancy, F-54500; France & Inserm CIC-EC, 1433, Nancy, F-54500, France
| | - M Andres
- Seccion de Reumatologia. Hospital, General Universitario de Alicante, Alicante, Spain
| | - K Briot
- Paris-Descartes University, Medicine Faculty, Cochin Hospital, Paris, France
| | | | - R Christensen
- Musculoskeletal Statistics Unit, The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark
| | | | - R Curbelo
- Instituto de Salud Musculoesquelética and Universidad de Valladolid, Spain
| | - Montserrat Ferrer
- Health Services Research Group, Medical Research Institute (Hospital del Mar), Barcelona, Spain. Coordinator of BiblioPRO
| | - Violaine Foltz
- UPMC Univ Paris 06, GRC-UPMC 08 (EEMOIS); AP-HP, Pitié Salpêtrière Hospital, Department of Rheumatology, Paris, France
| | - C Gonzalez
- Universidad Camilo José Cela, Madrid, Spain
| | - F Guillemin
- University of Lorraine, APEMAC EA 4360, Nancy, F-54500; France & Inserm CIC-EC, 1433, Nancy, F-54500, France
| | - P M Machado
- Coimbra University Hospital, Coimbra, Portugal; and MRC Centre for Neuromuscular Diseases, University College London, London, UK
| | | | - A Ravelli
- University of Genoa and Institute Giannina Gaslini, Genoa, Italy
| | - M Scholte-Voshaar
- Department of Psychology, Health and Technology, University of Twente, Enschede, The Netherlands
| | - T Uhlig
- National Resource Center for Rehabilitation in Rheumatology, Department of Rheumatology, Diakonhjemmet Hospital, Oslo, Norway
| | - L H D van Tuyl
- Department of Rheumatology, VU University Medical Center, Amsterdam, The Netherlands
| | - A Zink
- German Rheumatism Research Centre and Charité University Medicine, Berlin, Germany
| | - L Gossec
- UPMC Univ Paris 06, GRC-UPMC 08 (EEMOIS); AP-HP, Pitié Salpêtrière Hospital, Department of Rheumatology, Paris, France
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Riahi M, Naim C, Gobeil F, Mansour S, Matteau A, Essiambre R, Montigny M, Caron M, Sareault I, Potter B. IMPACT OF A MULTI-PRONGED INTERVENTION ON THE RATE OF INAPPROPRIATE CATHETERIZATION LABORATORY ACTIVATION USING AN AUTOMATED SYSTEM OF PRE-HOSPITAL STEMI DIAGNOSIS. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.056] [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: 11/15/2022] Open
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17
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Naim C, Riahi M, Gobeil F, Matteau A, Mansour S, Essiambre R, Montigny M, Caron M, Sareault I, Potter B. SUSTAINABILITY OF “PHYSICIAN-LESS” AUTOMATED PRE-HOSPITAL STEMI DIAGNOSIS AND CATHETERIZATION LABORATORY ACTIVATION TO ENSURE DOOR-TO-BALLOON TIMES: UPDATE AT 5 YEARS. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.194] [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: 10/22/2022] Open
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18
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Kitchen H, Rofail D, Caron M, Emery MP. Oncology patient-reported claims: maximising the chance for success. Ecancermedicalscience 2012; 5:212. [PMID: 22276055 PMCID: PMC3260907 DOI: 10.3332/ecancer.2011.212] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Indexed: 12/01/2022] Open
Abstract
Objectives/purpose: To review Patient Reported Outcome (PRO) labelling claims achieved in oncology in Europe and in the United States and consider the benefits, and challenges faced. Methods: PROLabels database was searched to identify oncology products with PRO labelling approved in Europe since 1995 or in the United States since 1998. The US Food and Drug Administration (FDA) and the European Medicines Agency (EMA) websites and guidance documents were reviewed. PUBMED was searched for articles on PRO claims in oncology. Results: Among all oncology products approved, 22 were identified with PRO claims; 10 in the United States, 7 in Europe, and 5 in both. The language used in the labelling was limited to benefit (e.g. “…resulted in symptom benefits by significantly prolonging time to deterioration in cough, dyspnoea, and pain, versus placebo”) and equivalence (e.g. “no statistical differences were observed between treatment groups for global QoL”). Seven products used a validated HRQoL tool; two used symptom tools; two used both; seven used single-item symptom measures (one was unknown). The following emerged as likely reasons for success: ensuring systematic PRO data collection; clear rationale for pre-specified endpoints; adequately powered trials to detect differences and clinically significant changes; adjusting for multiplicity; developing an a priori statistical analysis plan including primary and subgroup analyses, dealing with missing data, pooling multiple-site data; establishing clinical versus statistical significance; interpreting failure to detect change. End-stage patient drop-out rates and cessation of trials due to exceptional therapeutic benefit pose significant challenges to demonstrating treatment PRO improvement. Conclusions: PRO labelling claims demonstrate treatment impact and the trade-off between efficacy and side effects ultimately facilitating product differentiation. Reliable and valid instruments specific to the desired language, claim, and target population are required. Practical considerations include rationale for study endpoints, transparency in assumptions, and attention to subtle variations in data.
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Grard G, Drexler JF, Lekana-Douki S, Caron M, Lukashev A, Nkoghe D, Gonzalez JP, Drosten C, Leroy E. Type 1 wild poliovirus and putative enterovirus 109 in an outbreak of acute flaccid paralysis in Congo, October-November 2010. ACTA ACUST UNITED AC 2010; 15. [PMID: 21144443 DOI: 10.2807/ese.15.47.19723-en] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
An outbreak of flaccid paralysis syndrome in adults is ongoing in Congo. Molecular analysis of faecal, throat and cerebrospinal samples identified wildtype 1 poliovirus and an additional enterovirus C strain related to enterovirus 109 as the cause. As of 22 November, the cumulative number of cases was 409, of which 169 (41.3%) were fatal. This is one of the largest wild type 1 poliovirus outbreaks ever described associated with an unusually high case fatality rate.
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Affiliation(s)
- G Grard
- Centre International de Recherches Medicales de Franceville (CIRMF, International Centre of Medical Research of Francville), Franceville, Gabon
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20
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Desbois-Mouthon C, Magré J, Sert-Langeron C, Blivet-Van Eggelpoël MJ, Besmond C, Capeau J, Caron M. P-105: Altered insulin receptor functions due to different mutations in the insulin receptor gene in four patients with leprechaunism. Exp Clin Endocrinol Diabetes 2009. [DOI: 10.1055/s-0029-1211649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Dominici S, Fiori V, Magnani M, Schena E, Capanni C, Camozzi D, D'Apice MR, Le Dour C, Auclair M, Caron M, Novelli G, Vigouroux C, Maraldi NM, Lattanzi G. Different prelamin A forms accumulate in human fibroblasts: a study in experimental models and progeria. Eur J Histochem 2009; 53:43-52. [PMID: 19351612 DOI: 10.4081/ejh.2009.43] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Lamin A is a component of the nuclear lamina mutated in a group of human inherited disorders known as laminopathies. Among laminopathies, progeroid syndromes and lipodystrophies feature accumulation of prelamin A, the precursor protein which, in normal cells, undergoes a multi-step processing to yield mature lamin A. It is of utmost importance to characterize the prelamin A form accumulated in each laminopathy, since existing evidence shows that drugs acting on protein processing can improve some pathological aspects.We report that two antibodies raised against differently modified prelamin A peptides show a clear specificity to full-length prelamin A or carboxymethylated farnesylated prelamin A, respectively. Using these antibodies, we demonstrated that inhibition of the prelamin A endoprotease ZMPSTE24 mostly elicits accumulation of full-length prelamin A in its farnesylated form, while loss of the prelamin A cleavage site causes accumulation of carboxymethylated prelamin A in progeria cells. These results suggest a major role of ZMPSTE24 in the first prelamin A cleavage step.
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Affiliation(s)
- S Dominici
- Institute of Biochemistry, University of Urbino, Urbino, Italy
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22
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Hall FS, Li XF, Randall-Thompson J, Sora I, Murphy DL, Lesch KP, Caron M, Uhl GR. Cocaine-conditioned locomotion in dopamine transporter, norepinephrine transporter and 5-HT transporter knockout mice. Neuroscience 2009; 162:870-80. [PMID: 19482066 DOI: 10.1016/j.neuroscience.2009.05.058] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Revised: 05/06/2009] [Accepted: 05/26/2009] [Indexed: 01/09/2023]
Abstract
The behavioral effects of cocaine are affected by gene knockout (KO) of the dopamine transporter (DAT), the serotonin transporter (SERT) and the norepinephrine transporter (NET). The relative involvement of each of these transporters varies depending on the particular behavioral response to cocaine considered, as well as on other factors such as genetic background of the subjects. Interestingly, the effects of these gene knockouts on cocaine-induced locomotion are quite different from those on reward assessed in the conditioned place preference paradigm. To further explore the role of these genes in the rewarding effects of cocaine, the ability of five daily injections of cocaine to induce conditioned locomotion was assessed in DAT, SERT and NET KO mice. Cocaine increased locomotor activity acutely during the initial conditioning session in SERT KO and NET KO, but not DAT KO, mice. Surprisingly, locomotor responses in the cocaine-paired subjects diminished over the five conditioning sessions in SERT KO mice, while locomotor responses increased in DAT KO mice, despite the fact that they did not demonstrate any initial locomotor responses to cocaine. Cocaine-induced locomotion was unchanged over the course of conditioning in NET KO mice. In the post-conditioning assessment, conditioned locomotion was not observed in DAT KO mice, and was reduced in SERT KO and NET KO mice. These data reaffirm the central role of dopamine and DAT in the behavioral effects of cocaine. Furthermore, they emphasize the polygenic basis of cocaine-mediated behavior and the non-unitary nature of drug reward mechanisms, particularly in the context of previous studies that have shown normal cocaine-conditioned place preference in DAT KO mice.
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Affiliation(s)
- F S Hall
- Molecular Neurobiology Branch, NIDA-IRP/NIH/DHHS, 333 Cassell Drive, Baltimore, MD 21224, USA
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23
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Dominici S, Fiori V, Magnani M, Schena E, Capanni C, Camozzi D, D'Apice MR, Le Dour C, Auclair M, Caron M, Novelli G, Vigouroux C, Maraldi NM, Lattanzi G. Different prelamin A forms accumulate in human fibroblasts: a study in experimental models and progeria. Eur J Histochem 2009; 53:e6. [PMID: 30256865 PMCID: PMC3167279 DOI: 10.4081/ejh.2009.e6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2009] [Indexed: 12/25/2022] Open
Abstract
Lamin A is a component of the nuclear lamina mutated in a group of human inherited disorders known as laminopathies. Among laminopathies, progeroid syndromes and lipodystrophies feature accumulation of prelamin A, the precursor protein which, in normal cells, undergoes a multi-step processing to yield mature lamin A. It is of utmost importance to characterize the prelamin A form accumulated in each laminopathy, since existing evidence shows that drugs acting on protein processing can improve some pathological aspects. We report that two antibodies raised against differently modified prelamin A peptides show a clear specificity to full-length prelamin A or carboxymethylated farnesylated prelamin A, respectively. Using these antibodies, we demonstrated that inhibition of the prelamin A endoprotease ZMPSTE24 mostly elicits accumulation of full-length prelamin A in its farnesylated form, while loss of the prelamin A cleavage site causes accumulation of carboxymethylated prelamin A in progeria cells. These results suggest a major role of ZMPSTE24 in the first prelamin A cleavage step.
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Affiliation(s)
- S Dominici
- Institute of Biochemistry "G. Fornaini" University of Urbino, Urbino, Italy
| | | | - M Magnani
- Institute of Biochemistry "G. Fornaini" University of Urbino, Urbino, Italy
| | - E Schena
- Laboratory of Cell Biology, Istituto Ortopedico Rizzoli, Bologna, Italy
| | - C Capanni
- IGM-CNR, Unit of Bologna, c/o IOR, Bologna, Italy
| | - D Camozzi
- Laboratory of Cell Biology, Istituto Ortopedico Rizzoli, Bologna, Italy
| | - M R D'Apice
- Dept. of Biopathology and Diagnostic Imaging, University of Rome Tor Vergata, Rome, Italy
| | - C Le Dour
- UPMC Université Paris, France.,INSERM, UMR_S893Eq9, Paris, France
| | - M Auclair
- UPMC Université Paris, France.,INSERM, UMR_S893Eq9, Paris, France
| | - M Caron
- UPMC Université Paris, France.,INSERM, UMR_S893Eq9, Paris, France
| | - G Novelli
- Dept. of Biopathology and Diagnostic Imaging, University of Rome Tor Vergata, Rome, Italy.,Fondazione Livio Patrizi, Rome, Italy
| | - C Vigouroux
- UPMC Université Paris, France.,INSERM, UMR_S893Eq9, Paris, France.,AP-HP, Hôpital Tenon, Service de Biochimie et Hormonologie, Paris, France
| | - N M Maraldi
- Laboratory of Cell Biology, Istituto Ortopedico Rizzoli, Bologna, Italy
| | - G Lattanzi
- IGM-CNR, Unit of Bologna, c/o IOR, Bologna, Italy
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Bignon M, Hardouin J, Brechot N, Nasciutti L, Joubert-caron R, Caron M, Germain S, Monnot C, Muller L. D024 Lysyl oxidase like 2 regulates vascular cells migration and basal lamina organisation. Arch Cardiovasc Dis 2009. [DOI: 10.1016/s1875-2136(09)72234-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Caron M, Auclair M, Donadille B, Béréziat V, Guerci B, Laville M, Narbonne H, Bodemer C, Lascols O, Capeau J, Vigouroux C. Human lipodystrophies linked to mutations in A-type lamins and to HIV protease inhibitor therapy are both associated with prelamin A accumulation, oxidative stress and premature cellular senescence. Cell Death Differ 2007; 14:1759-67. [PMID: 17612587 DOI: 10.1038/sj.cdd.4402197] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.6] [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: 11/09/2022] Open
Abstract
Lipodystrophic syndromes associated with mutations in LMNA, encoding A-type lamins, and with HIV antiretroviral treatments share several clinical characteristics. Nuclear alterations and prelamin A accumulation have been reported in fibroblasts from patients with LMNA mutations and adipocytes exposed to protease inhibitors (PI). As genetically altered lamin A maturation also results in premature ageing syndromes with lipodystrophy, we studied prelamin A expression and senescence markers in cultured human fibroblasts bearing six different LMNA mutations or treated with PIs. As compared to control cells, fibroblasts with LMNA mutations or treated with PIs had nuclear shape abnormalities and reduced proliferative activity that worsened with increasing cellular passages. They exhibited prelamin A accumulation, increased oxidative stress, decreased expression of mitochondrial respiratory chain proteins and premature cellular senescence. Inhibition of prelamin A farnesylation prevented cellular senescence and oxidative stress. Adipose tissue samples from patients with LMNA mutations or treated with PIs also showed retention of prelamin A, overexpression of the cell cycle checkpoint inhibitor p16 and altered mitochondrial markers. Thus, both LMNA mutations and PI treatment result in accumulation of farnesylated prelamin A and oxidative stress that trigger premature cellular senescence. These alterations could participate in the pathophysiology of lipodystrophic syndromes and lead to premature ageing complications.
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Affiliation(s)
- M Caron
- INSERM U680, Université Pierre et Marie Curie-Paris 6, Faculté de Médecine, Site Saint-Antoine, 27 rue Chaligny, 75571 Paris Cedex 12, France.
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26
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Dey BR, Shaffer J, Yee AJ, McAfee S, Caron M, Power K, Ting DT, Colby C, Preffer F, Ballen K, Attar E, Saidman S, Tarbell N, Sachs D, Sykes M, Spitzer TR. Comparison of outcomes after transplantation of peripheral blood stem cells versus bone marrow following an identical nonmyeloablative conditioning regimen. Bone Marrow Transplant 2007; 40:19-27. [PMID: 17468773 DOI: 10.1038/sj.bmt.1705688] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [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: 12/25/2022]
Abstract
This is the first study to examine the outcomes in 54 patients with hematologic malignancies who received an HLA-matched related donor bone marrow (BM, n = 42) or GCSF-mobilized peripheral blood stem cells (PBSC, n = 12) following identical nonmyeloablative conditioning with the intention of induction of mixed chimerism (MC) followed by prophylactic donor leukocyte infusion (pDLI) to convert MC to full donor chimerism (FDC) and capture a graft-versus-tumor effect without clinical graft-versus-host disease (GVHD). Neutrophil and platelet recovery were faster and transfusion requirement was less in PBSC recipients (P < 0.05). A total of 48% of BMT recipients achieved FDC with a median conversion time of 84 days, including 13 following pDLI. In contrast, 83% (P = 0.04) in the PBSC group had spontaneous FDC at a median of 14 days, precluding the administration of pDLI. There was no significant difference in the incidences of acute or chronic GVHD, though the rates of chronic GVHD were considerably higher in PBSC group than in the BM group (6/7, 86% vs 10/24, 42%). CD4 and CD8 T-cell recovery was faster in PBSC recipients. In PBSC recipients, a higher number of CD34+ cells was associated with increased rates of severe, grade III-IV acute GVHD.
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Affiliation(s)
- B R Dey
- Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
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Capeau J, Magré J, Lascols O, Caron M, Béréziat V, Vigouroux C. [Primary lipodystrophies]. Ann Endocrinol (Paris) 2007; 68:10-20. [PMID: 17320032 DOI: 10.1016/j.ando.2006.12.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2006] [Revised: 12/15/2006] [Accepted: 12/15/2006] [Indexed: 11/30/2022]
Abstract
Primary lipodystrophies represent a heterogeneous group of very rare diseases with a prevalence of less than 1 case for 100.000, inherited or acquired, caracterized by a loss of body fat either generalized or localized (lipoatrophy). In some forms, lipoatrophy is associated with a selective hypertrophy of other fat depots. Clinical signs of insulin resistance are often present: acanthosis nigricans, signs of hyperandrogenism. All lipodystrophies are associated with dysmetabolic alterations with insulin resistance, altered glucose tolerance or diabetes and hypertriglyceridemia leading to a risk of acute pancreatitis. Chronic complications are those resulting from diabetes involving the retina, kidney and nerves, cardiovascular complications and steatotic liver lesions that could result in cirrhosis. Genetic forms of generalized lipodystrophy (or Berardinelli-Seip syndrome) result, in most cases, from recessive mutations in one of two genes: either BSCL2 coding seipin or BSCL1 coding AGPAT2, an acyl-transferase involved in triglyceride synthesis. Acquired generalized lipodystrophy (Lawrence syndrome) is of unknown origin but is sometimes associated with signs of autoimmunity. Partial lipodystrophies can be familial with dominant transmission. Heterozygous mutations have been identified in the LMNA gene encoding nuclear lamin A/C belonging to the nuclear lamina, or in PPARG encoding the adipogenic transcription factor PPARgamma. Some less typical lipodystrophies, associated with signs of premature aging, have been linked to mutations in LMNA or in the ZMPSTE24 gene encoding the protease responsible for the maturation of prelamin A into lamin A. Acquired partial lipodystrophy (Barraquer-Simons syndrome) is characterized by cephalothoracic fat loss. Its aetiology is unknown but mutations in LMNB2, encoding the lamina protein lamin B2, could represent susceptibility factors. Highly active antiretroviral treatments for HIV infection are currently the most frequent cause of acquired secondary lipodystrophic syndromes. The genetic diagnosis is performed in specialized laboratories and, in the most severe forms, antenatal diagnosis could be proposed. Treatment of diabetes, dyslipidemia and complications involves the classical intervention strategies. Insulino-sensitizing drugs are useful. Therapeutic trials with recombinant human leptin in patients with very low leptin levels reported good results with respect to the metabolic and liver alterations. The prognosis is linked to the precocity and severity of the diabetic, cardiovascular and liver complications.
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Affiliation(s)
- J Capeau
- Inserm, U680, 75012 Paris, France.
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28
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Caron M, Enouf V, Than SC, Dellamonica L, Buisson Y, Nicand E. Identification of genotype 1 hepatitis E virus in samples from swine in Cambodia. J Clin Microbiol 2006; 44:3440-2. [PMID: 16954296 PMCID: PMC1594735 DOI: 10.1128/jcm.00939-06] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Hepatitis E virus (HEV) is a major enterically transmitted pathogen in many developing countries, where it causes outbreaks and sporadic cases of acute hepatitis. A study conducted with pigs from several livestock farms in Cambodia identified one swine genotype 1 HEV isolate as being associated with prevalent swine genotype 3 HEV.
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Affiliation(s)
- M Caron
- Centre National de Référence du Virus de l'Hépatite E, HIA Val de Grâce, Laboratoire de Biologie, 74 bd. Port Royal, Cedex 05, Paris 75230, France.
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Lagathu C, Yvan-Charvet L, Bastard JP, Maachi M, Quignard-Boulangé A, Capeau J, Caron M. Long-term treatment with interleukin-1beta induces insulin resistance in murine and human adipocytes. Diabetologia 2006; 49:2162-73. [PMID: 16865359 DOI: 10.1007/s00125-006-0335-z] [Citation(s) in RCA: 221] [Impact Index Per Article: 12.3] [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] [Received: 02/22/2006] [Accepted: 05/04/2006] [Indexed: 12/22/2022]
Abstract
AIMS/HYPOTHESIS Adipose tissue inflammation has recently been implicated in the pathogenesis of insulin resistance and is probably linked to high local levels of cytokines. IL1B, a proinflammatory cytokine, may participate in this alteration. MATERIALS AND METHODS We evaluated the chronic effect (1-10 days) of IL1B (0.1-20 ng/ml) on insulin signalling in differentiating 3T3-F442A and differentiated 3T3-L1 murine adipocytes and in human adipocytes. We also assessed expression of the gene encoding IL1B in adipose tissue of wild-type and insulin-resistant mice (diet-induced and genetically obese ob/ob mice). RESULTS IL1B inhibited insulin-induced phosphorylation of the insulin receptor beta subunit, insulin receptor substrate 1, Akt/protein kinase B and extracellular regulated kinase 1/2 in murine and human adipocytes. Accordingly, IL1B suppressed insulin-induced glucose transport and lipogenesis. Long-term treatment of adipose cells with IL1B decreased cellular lipid content. This could result from enhanced lipolysis and/or decreased expression of genes involved in lipid metabolism (acetyl-CoA carboxylase, fatty acid synthase). Down-regulation of peroxisome proliferating-activated receptor gamma and CCAAT/enhancer-binding protein alpha in response to IL1B may have contributed to the altered phenotype of IL1B-treated adipocytes. Moreover, IL1B altered adipocyte differentiation status in long-term cultures. IL1B also decreased the production of adiponectin, an adipocyte-specific protein that plays a positive role in insulin sensitivity. Expression of the gene encoding IL1B was increased in epididymal adipose tissue of obese insulin-resistant mice. CONCLUSIONS/INTERPRETATION IL1B is upregulated in adipose tissue of obese and insulin-resistant mouse models and may play an important role in the development of insulin resistance in murine and human adipose cells.
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Affiliation(s)
- C Lagathu
- INSERM, U680, Université Pierre et Marie Curie (UPMC-Paris 6), Faculty of Medicine, 27 rue Chaligny, 75012, Paris, France
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Enouf V, Dos Reis G, Guthmann JP, Guerin PJ, Caron M, Marechal V, Nicand E. Validation of single real-time TaqMan PCR assay for the detection and quantitation of four major genotypes of hepatitis E virus in clinical specimens. J Med Virol 2006; 78:1076-82. [PMID: 16789018 DOI: 10.1002/jmv.20665] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [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: 12/22/2022]
Abstract
Since the characterization of the genome of the hepatitis E virus (HEV) in 1990, a large genetic diversity has been described. A single real-time reverse transcription (RT)-PCR assay with TaqMan technology has been validated which uses only one set of primers and probe within the ORF2 HEV region (nt 5207-5292) for the detection and quantification of the four major genotypes of HEV. This assay proved to be as efficient as the conventional RT-PCR methodology for the detection of HEV in clinical samples testing positive previously. The real-time RT-PCR and conventional RT-PCR were performed comparatively on 60 pairs of sera and stools collected during a recent outbreak of hepatitis E in Darfur. The real-time RT-PCR assay was 10- to 100-fold sensitive than for conventional RT-PCR assays used in this study with a range quantitation from 1.8 x 10(1) to 7.2 x 10(3) RNA copies/microl in clinical samples (serum and stools).
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Affiliation(s)
- V Enouf
- National Reference Centre for Hepatitis E, Teaching Military Hospital Val de Grace, Paris, France.
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31
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Capeau J, Magré J, Lascols O, Caron M, Béréziat V, Vigouroux C, Bastard JP. Diseases of adipose tissue: genetic and acquired lipodystrophies. Biochem Soc Trans 2006; 33:1073-7. [PMID: 16246048 DOI: 10.1042/bst0331073] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [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: 11/17/2022]
Abstract
Human lipodystrophies represent a group of diseases characterized by altered body fat amount and/or repartition and major metabolic alterations with insulin resistance leading to diabetic complications and increased cardiovascular and hepatic risk. Genetic forms of lipodystrophies are rare. Congenital generalized lipodystrophy or Berardinelli-Seip syndrome, autosomal recessive, is characterized by a complete early lipoatrophy and severe insulin resistance and results, in most cases, from mutations either in the seipin gene of unknown function or AGPAT2 encoding an enzyme involved in triacylglycerol synthesis. The Dunnigan syndrome [FPLD2 (familial partial lipodystrophy of the Dunnigan type)] is due to mutations in LMNA encoding the lamin A/C, belonging to the complex group of laminopathies that could comprise muscular and cardiac dystrophies, neuropathies and syndromes of premature aging. Some FPLDs are linked to loss-of-function mutations in the PPAR-gamma gene (peroxisome-proliferator-activated receptor gamma; FPLD3) with severe metabolic alterations but a less severe lipodystrophy compared with FPLD2. The metabolic syndrome, acquired, represents the most common form of lipodystrophy. HIV-infected patients often present lipodystrophies, mainly related to side effects of antiretroviral drugs together with insulin resistance and metabolic alterations. Such syndromes help to understand the mechanisms involved in insulin resistance resulting from altered fat repartition and could benefit from insulin-sensitizing effects of lifestyle modifications or of specific medications.
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Affiliation(s)
- J Capeau
- INSERM U680, Saint-Antoine Faculty of Medicine, Université Pierre et Marie Curie (UPMC), Paris, France.
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32
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Ion G, Fajka-Boja R, Tóth GK, Caron M, Monostori E. Role of p56lck and ZAP70-mediated tyrosine phosphorylation in galectin-1-induced cell death. Cell Death Differ 2005; 12:1145-7. [PMID: 15832176 DOI: 10.1038/sj.cdd.4401628] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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33
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Pionneau C, Canelle L, Bousquet J, Hardouin J, Bigeard J, Caron M, Joubert-Caron R. Proteomic Analysis of Membrane-associated Proteins from the Breast Cancer Cell Line MCF7. Cancer Genomics Proteomics 2005; 2:199-207. [PMID: 31394708] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2005] [Accepted: 06/17/2005] [Indexed: 06/10/2023] Open
Abstract
BACKGROUND Proteins associated with cancer cell membranes represent targets of choice for humoral immune response as well as potential tumour marker proteins in human malignancies. However, proteomic analysis of these proteins, and more generally of low-soluble proteins, remains difficult. MATERIALS AND METHODS The breast cancer cell line MCF7 was selected to evaluate a sequential extraction method that enables simple fractionation of human cell proteins according to their subcellular localization, yielding subproteomes enriched in cytosolic and membrane-associated proteins, respectively. A crude plasma membrane preparation was followed by the solubilisation of proteins using trifluoroethanol (TFE) as co-solvent. RESULTS Cross-matching and statistical analysis performed for each set of two-dimensional electrophoresis (whole-cell, membrane and soluble extracts) and between the different sets highlighted the reproducibility of the extraction process and its usefulness for proteomic analysis. Eighty-three % of the spots of the gels corresponding to the membrane fraction were not found in the gels of the soluble fraction. CONCLUSION Due to its simplicity, the approach described here appears well suited for membrane proteomic investigation of human cancer cells and detection of potential biomarkers undetected by current techniques.
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Affiliation(s)
- C Pionneau
- Protein Biochemistry and Proteomics Laboratory (LBPP), UFR SMBH, Université Paris 13, 93017 Bobigny
| | - L Canelle
- Protein Biochemistry and Proteomics Laboratory (LBPP), UFR SMBH, Université Paris 13, 93017 Bobigny
- R&D Immunoessais et Protéomique, bioMérieux, Chemin de l'Orme, 69280 Marcy l'Etoile, France
| | - J Bousquet
- Protein Biochemistry and Proteomics Laboratory (LBPP), UFR SMBH, Université Paris 13, 93017 Bobigny
| | - J Hardouin
- Protein Biochemistry and Proteomics Laboratory (LBPP), UFR SMBH, Université Paris 13, 93017 Bobigny
| | - J Bigeard
- Protein Biochemistry and Proteomics Laboratory (LBPP), UFR SMBH, Université Paris 13, 93017 Bobigny
| | - M Caron
- Protein Biochemistry and Proteomics Laboratory (LBPP), UFR SMBH, Université Paris 13, 93017 Bobigny
| | - R Joubert-Caron
- Protein Biochemistry and Proteomics Laboratory (LBPP), UFR SMBH, Université Paris 13, 93017 Bobigny
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Kadri T, Lataillade JJ, Doucet C, Marie A, Ernou I, Bourin P, Joubert-Caron R, Caron M, Lutomski D. Proteomic Study of Galectin-1 Expression in Human Mesenchymal Stem Cells. Stem Cells Dev 2005; 14:204-12. [PMID: 15910247 DOI: 10.1089/scd.2005.14.204] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Bone marrow-derived mesenchymal stem cells (MSCs) are known to interact with hematopoietic stem cells (HSCs) and immune cells, and are of potential interest to be used as therapeutic agents for enhancing allogenic hematopoietic engraftment and preventing graft-versus-host disease (GVHD). Galectin 1 (Gal1) belongs to a family of structurally related molecules expressed in many vertebrate tissues that exert their functions both by binding to glycoconjugates, and by interaction with protein partners. In this work using a proteomic approach, we looked for the presence and the localization of Gal1 in short- and long-term culture of human (h) hMSC. We first determined, that Gal1 is one of the major proteins expressed in hMSC. We futher demonstrated that its expression is maintained when hMSC are expanded through a subculturing process up to five passages. Moreover, Gal1 is secreted and found at the cell surface of MSC, participating in extra cellular matrix (ECM)-cell interactions. Given the immunomodulatory properties of Gal1, its potential involvement in immunological functions of hMSC could be suggested.
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Affiliation(s)
- T Kadri
- Laboratoire de Biochimie des Protéines et Protéomique (E.A. 3408), UFR SMBH Leonard de Vinci, Université Paris 13, 93017 Bobigny Cedex, France
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35
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Imam-Sghiouar N, Joubert-Caron R, Caron M. Application of metal-chelate affinity chromatography to the study of the phosphoproteome. Amino Acids 2005; 28:105-9. [PMID: 15645166 DOI: 10.1007/s00726-004-0130-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2004] [Accepted: 09/13/2004] [Indexed: 10/25/2022]
Abstract
With the increasing importance of proteome analysis, studying the phosphoproteome is a priority for functional studies. Therefore, a rational approach to simplifying the proteome is needed. In this work, we examined the use of immobilized metal affinity chromatography (IMAC) using ferric ions-chelated column for enriching crude cell extracts in phosphoproteins. The adsorption of the proteins on Fe(3+) was obtained at an acidic pH 5.6, and their elution at a more basic pH in Tris buffer. To evaluate the separation, western blots were performed with either anti-phosphotyrosine or anti-phosphoserine/threonine. The analysis of the eluates demonstrated the selectivity of the separation, particularly for proteins phosphorylated on serine or threonine. In conclusion, the advantages and the limits of this approach are discussed.
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Affiliation(s)
- N Imam-Sghiouar
- Laboratoire de Biochimie des Protéines et Protéomique, UFR SMBH Léonard de Vinci, EA 3408, 93017 Bobigny, France
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36
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Bastard JP, Lagathu C, Maachi M, Kim M, Vigouroux C, Caron M, Vidal H, Capeau J. [Adipose tissue cytokines and insulin resistance]. Journ Annu Diabetol Hotel Dieu 2004:29-37. [PMID: 15259303] [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: 04/30/2023]
Affiliation(s)
- J P Bastard
- INSERM U402, Faculté de Médecine Saint-Antoine et Service de Biochimie et Hormonologie, Hôpital Tenon, Université Pierre et Marie Curie, Paris
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37
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Capeau J, Magré J, Vigouroux C, Caron M, Maachi M, Dubosclard E, Lascols O, Bastard JP. [Diabetes and genetic and acquired lipodystrophy syndrome]. Journ Annu Diabetol Hotel Dieu 2003:99-109. [PMID: 12868305] [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: 03/03/2023]
Affiliation(s)
- J Capeau
- Service de Biochimie et Hormonologie, Hôpital Tenon, Unité INSERM 402, Faculté de Médecine Saint-Antoine, Université Pierre et Marie Curie, Paris, France
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38
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Caron M, Bastard JP, Auclair M, Vigouroux C, Capeau J. [Antiretroviral treatment for HIV and adipose tissue]. Journ Annu Diabetol Hotel Dieu 2003:147-58. [PMID: 12868307] [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: 03/03/2023]
Affiliation(s)
- M Caron
- Inserm U402, Faculté de Médecine Saint-Antoine, Université Pierre et Marie Curie, Paris, France
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39
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Grandadam M, Nicand E, Koeck JL, Caron M, Teyssou R. [Status of resistance of HIV-1 strains in Africa: what is the role of viral surveillance networks?]. Med Trop (Mars) 2003; 62:89-93. [PMID: 12038188] [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] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
The human immunodeficiency virus (HIV-1) epidemic has spread dramatically in sub-Saharan African countries. Implementation of active antiretroviral (ARV) therapy programs is urgently needed. However this emergency situation must not extenuate the importance of preliminary studies on ARV resistance of African HIV-1 isolates. Findings show that genetic mutations underlying the resistance of African strains are generally identical to those observed in HIV-1 subtype B in industrialized countries. However the incidence of some mutations associated with mild resistance to protease inhibitors (PI) appears higher in African isolates. The potential impact of these mutations for development of frank resistance to PI is still unclear. The incidence of high-grade resistance markers in untreated subjects is low. While these results do not compromise use of ARV therapy in Africa, they underline the need to set up local networks for patient follow-up and to carry out epidemiological surveillance of HIV-1 resistance. Success of ARV therapies in Africa will also depend on economic and social programs.
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Affiliation(s)
- M Grandadam
- Laboratoire de biologie clinique, HIA Val-de-Grâce, 74 Bd Port Royal, 75230 Paris.
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40
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Hall FS, Li XF, Sora I, Xu F, Caron M, Lesch KP, Murphy DL, Uhl GR. Cocaine mechanisms: enhanced cocaine, fluoxetine and nisoxetine place preferences following monoamine transporter deletions. Neuroscience 2003; 115:153-61. [PMID: 12401330 DOI: 10.1016/s0306-4522(02)00379-2] [Citation(s) in RCA: 83] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Cocaine blocks uptake by neuronal plasma membrane transporters for dopamine, serotonin and norepinephrine, producing subjective effects in humans that are both euphoric/rewarding and also fearful, jittery and aversive. Mice with gene knockouts of each of these transporters display cocaine reward, manifest by cocaine place preferences that are at least as great as wildtype values. Norepinephrine and serotonin receptor knockouts even display enhanced cocaine reward. One explanation for these observations could be that cocaine produces aversive or anhedonic effects by serotonin or norepinephrine receptor blockade in wildtype mice that are removed in serotonin or norepinephrine receptor knockouts, increasing net cocaine reward. Adaptations to removing one transporter could also change the rewarding valence of blocking the remaining transporters. To test these ideas, drugs that block serotonin transporter (fluoxetine), norepinephrine transporter (nisoxetine) or all three transporters (cocaine) were examined in single- or multiple-transporter knockout mice. Fluoxetine and nisoxetine acquire rewarding properties in several knockouts that are not observed in wildtype mice. Adding serotonin transporter knockout to norepinephrine transporter knockouts dramatically potentiates cocaine reward. These and previous data provide evidence that serotonin and norepinephrine transporter blockade can contribute to the net rewarding valence of cocaine. They identify neuroadaptations that may help to explain the retention of cocaine reward by dopamine and serotonin transporter knockout mice. They are consistent with emerging hypotheses that actions at the three primary brain molecular targets for cocaine each provide distinct contributions to cocaine reward and cocaine aversion in wildtype mice, and that this balance changes in mice that develop without dopamine, norepinephrine or serotonin transporters.
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Affiliation(s)
- F S Hall
- Molecular Neurobiology Branch, NIDA-IRP, NIH, Box 5180, Baltimore, MD 21224, USA
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41
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DeMarinis R, Krog A, Shah D, Lafferty J, Holden K, Hieble J, Matthews W, Regan J, Lefkowitz R, Caron M. Additions and Corrections-Development of an Affinity Ligand for Purification of Adrenoceptors from Human Platelet Membranes. J Med Chem 2002. [DOI: 10.1021/jm00378a603] [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: 11/30/2022]
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42
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Vigouroux C, Magré J, Desbois-Mouthon C, Lascols O, Cherqui G, Caron M, Capeau J. [Major insulin resistance syndromes: clinical and physiopathological aspects]. J Soc Biol 2002; 195:249-57. [PMID: 11833462] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Insulin resistance is a common metabolic disorder. It plays an important role in the metabolic syndrome (or syndrome X), type 2 diabetes, obesity and in the lipodystrophic syndromes recently described, associated with treatments of HIV disease and represent a worrying cardiovascular risk. However, its pathophysiology remains poorly understood in these situations. Syndromes of major insulin resistance, although rare, allow investigations of the mechanisms leading to alterations in the insulin transduction pathways. Mutations of the insulin receptor gene have been discovered in rare patients. Therefore alterations at the post-receptor level are probably causative in other cases. Furthermore, the role of body fat repartition seems determinant in the apparition of insulin resistance, as attested by the clinical characteristics of lipodystrophies, either congenital or acquired. The two lipodystrophic syndromes which molecular defect is identified are the familial partial lipodystrophy of the Dunnigan type, due to mutations of the lamin A/C gene, and the congenital generalized lipodystrophy, linked to alterations in the protein seipin. However, their physiopathology remains mysterious. Lamin A/C is indeed an ubiquitous nuclear protein, which is also mutated in a genetic squelettic and/or cardiac myopathy, and seipin is a protein of unknown function mainly expressed in brain. Progresses in the understanding of these syndromes, in particular lipodystrophies which can be considered as caricatural models of the metabolic syndrome, will probably allow to clarify the physiopathology of the more common forms of insulin resistance.
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Affiliation(s)
- C Vigouroux
- Unité INSERM 402, Faculté de Médecine Saint-Antoine, 27, Rue Chaligny, 75571 Paris.
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43
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Poirier F, Pontet M, Labas V, le Caër JP, Sghiouar-Imam N, Raphaël M, Caron M, Joubert-Caron R. Two-dimensional database of a Burkitt lymphoma cell line (DG 75) proteins: protein pattern changes following treatment with 5'-azycytidine. Electrophoresis 2001. [PMID: 11425244 DOI: 10.1002/1522-2683(200105)22:9%3c1867::aid-elps1867%3e3.0.co;2-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Hypermethylation is an important mechanism for repression of tumor gene suppressor in cancer. The drug 5'-azacytidine (AZC) has been used as demethylating agent to induce the expression of previously silencing genes. In the present work, we attempted to determine, using proteomics, the changes in protein expression profiles following a treatment of an Epstein Barr virus (EBV)-negative Burkitt lymphoma (BL) cell line DG 75. The effects of the treatment in terms of cell viability and growth were first examined. The following observations were made: AZC treatment led to (i) a decrease in cell growth with an arrest of the cell at G0/G1 phase of the cell cycle, (ii) the expression of p16, a tumor-suppressor gene whose expression was dependent on its promoter demethylation. Proteomic study evidenced that AZC treatment affected protein expression in two different ways. Twenty-one polypeptides were down-expressed, while 14 showed an increased expression. Some of the upregulated proteins appeared related to the energy metabolism, to organization of cytoskeletal structures, and to cell viability and protein synthesis. We also established a reference map for proteins in DG 75 cell line, comprising 74 different polypeptides corresponding to 67 proteins. This map will be accessible via Internet as a resource for proteome analyses of B-cells. Taken together, the results presented here highlight new insights into lymphoma cell gene regulations following a treatment of lymphoma cells with AZC and illustrate a use of proteomics to evidence the direct and indirect effects of a drug and the pathways it possibly regulates.
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Affiliation(s)
- F Poirier
- Biochimie des Protéines et Protéomique, Université Paris 13, UFR SMBH Léonard de Vinci, Bobigny, France
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44
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Caron M, Auclair M, Vigouroux C, Glorian M, Forest C, Capeau J. The HIV protease inhibitor indinavir impairs sterol regulatory element-binding protein-1 intranuclear localization, inhibits preadipocyte differentiation, and induces insulin resistance. Diabetes 2001; 50:1378-88. [PMID: 11375339 DOI: 10.2337/diabetes.50.6.1378] [Citation(s) in RCA: 247] [Impact Index Per Article: 10.7] [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: 01/04/2023]
Abstract
Protease inhibitors used in the treatment of HIV infection have been causally associated with lipodystrophy and insulin resistance and were shown to alter adipocyte differentiation in cultured cells. We aimed to delineate the mechanism by which indinavir impaired adipocyte function. We report that indinavir altered neither the growth nor insulin sensitivity of 3T3-F442A preadipocytes, nor did it alter the initial step of their differentiation, i.e., clonal proliferation. However, adipose conversion was inhibited by indinavir (by 50-60%), as shown by 1) the decrease in the number of newly formed adipocytes; 2) the lower level of the adipogenic protein markers, sterol regulatory element-binding protein-1 (SREBP-1), peroxisome proliferator-activated receptor-gamma (PPAR-gamma), and the insulin receptor (IR); and 3) the lack of SREBP-1 and PPAR-gamma immunoreactivity in the nucleus of most indinavir-treated cells. Partial adipose conversion also correlated with an accumulation of SREBP-1 at the nuclear periphery and an alteration in its electrophoretic mobility. Defective expression and nuclear localization of PPAR-gamma probably resulted from the decreased level of nuclear SREBP-1. Indinavir also rendered 3T3-F442A adipocytes resistant to insulin for mitogen-activated protein kinase activation at a step distal to IR substrate-1 tyrosine phosphorylation. Hence, indinavir impairs differentiation at an early step of adipose conversion probably involving the process controlling SREBP-1 intranuclear localization.
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Affiliation(s)
- M Caron
- Institut National de la Santé et de la Recherche Médicale (INSERM) U 402, Faculté de Médecine Saint-Antoine, 27, rue Chaligny, 75571 Paris Cedex 12, France.
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45
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Poirier F, Pontet M, Labas V, le Caër JP, Sghiouar-Imam N, Raphaël M, Caron M, Joubert-Caron R. Two-dimensional database of a Burkitt lymphoma cell line (DG 75) proteins: protein pattern changes following treatment with 5'-azycytidine. Electrophoresis 2001; 22:1867-77. [PMID: 11425244 DOI: 10.1002/1522-2683(200105)22:9<1867::aid-elps1867>3.0.co;2-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Hypermethylation is an important mechanism for repression of tumor gene suppressor in cancer. The drug 5'-azacytidine (AZC) has been used as demethylating agent to induce the expression of previously silencing genes. In the present work, we attempted to determine, using proteomics, the changes in protein expression profiles following a treatment of an Epstein Barr virus (EBV)-negative Burkitt lymphoma (BL) cell line DG 75. The effects of the treatment in terms of cell viability and growth were first examined. The following observations were made: AZC treatment led to (i) a decrease in cell growth with an arrest of the cell at G0/G1 phase of the cell cycle, (ii) the expression of p16, a tumor-suppressor gene whose expression was dependent on its promoter demethylation. Proteomic study evidenced that AZC treatment affected protein expression in two different ways. Twenty-one polypeptides were down-expressed, while 14 showed an increased expression. Some of the upregulated proteins appeared related to the energy metabolism, to organization of cytoskeletal structures, and to cell viability and protein synthesis. We also established a reference map for proteins in DG 75 cell line, comprising 74 different polypeptides corresponding to 67 proteins. This map will be accessible via Internet as a resource for proteome analyses of B-cells. Taken together, the results presented here highlight new insights into lymphoma cell gene regulations following a treatment of lymphoma cells with AZC and illustrate a use of proteomics to evidence the direct and indirect effects of a drug and the pathways it possibly regulates.
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Affiliation(s)
- F Poirier
- Biochimie des Protéines et Protéomique, Université Paris 13, UFR SMBH Léonard de Vinci, Bobigny, France
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46
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Poirier F, Imam N, Pontet M, Joubert-Caron R, Caron M. The BPP (protein biochemistry and proteomics) two-dimensional electrophoresis database. J Chromatogr B Biomed Sci Appl 2001; 753:23-8. [PMID: 11302443 DOI: 10.1016/s0378-4347(00)00459-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The BPP (protein biochemistry and proteomics) two-dimensional electrophoresis (2-DE) database (http://www-smbh.univ-paris13.fr/lbtp/Biochemistry/Biochimie/bque.htm) was established in 1998. The current release contains 11 reference maps from human hematopoietic and lymphoid cell line samples. These reference maps have now 255 identified spots, corresponding to 84 protein entries. The World Wide Web (WWW) presentation is designed to allow public access to the available 2-DE data together with logical connections to databases providing complementary information.
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Affiliation(s)
- F Poirier
- Biochimie des Protéines et Protéomique, Biochimie Cellulaire des Hémopathies Lymphoïdes (EA 1625), UFR SMBH Léonard de Vinci, Université Paris 13, Bobigny, France
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47
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Etchebehere EC, Caron M, Pereira JA, Lima MC, Santos AO, Ramos CD, Barros FB, Sanches A, Santos-Jesus R, Belangero W, Camargo EE. Activation of the growth plates on three-phase bone scintigraphy: the explanation for the overgrowth of fractured femurs. Eur J Nucl Med 2001; 28:72-80. [PMID: 11202455 DOI: 10.1007/s002590000395] [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] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Children with an uncomplicated femoral fracture, treated with superimposition of fragments and intentional shortening, usually develop overgrowth of the fractured femur and the ipsilateral tibia which may compensate for the initial shortening and enable the limb in question to reach a length similar to that on the normal side. The overgrowth is evaluated clinically and by scanography. The increased metabolic activity of the growth plates that support this overgrowth has not been documented by any laboratory method. In order to evaluate the metabolic activity of the growth plates, 18 patients (11 males, seven females; mean age 6.1 years) with fractures of the femur were studied at three different time intervals (2-5 months, 6-12 months and 18-24 months). Three-phase bone scintigraphy was performed in all patients. Ten children (five males, five females; mean age 7.5 years) who had had bone imaging for other reasons were used as the control group. Visual analysis of the flow and equilibrium phases was performed for the distal femoral and proximal tibial growth plates. Visual and semi-quantitative analyses of the delayed images were performed for the distal femoral and proximal and distal tibial growth plates. Semi-quantitative analyses yielded the following activity ratios: (a) the distal femoral growth plate of the fractured femur to the contralateral one (FR); (b) the proximal growth plate of the tibia on the side of the fractured femur to the contralateral one (TpR); (c) the distal growth plate of the tibia on the side of the fractured femur to the contralateral one (TdR); and (d) in the control group, the distal growth plates of both femora (FCG) and the proximal (TCGp) and distal (TCGd) growth plates of the tibiae. Visual analysis of the blood flow, equilibrium and delayed images showed increased activity in the distal femoral growth plates during the first and second time intervals, but not during the third. No significant activity changes were found in the proximal and distal tibial growth plates during any of the phases analysed. The mean and standard deviation for FR in the three time intervals were: FRI=1.22+/-0.27, FRII=1.17+/-0.16 and FRIII=1.09+/-0.20. FR values were significantly higher than in the control group (FCG=0.99+/-0.03) (P=0.033). The mean and standard deviation for TpR in the three time intervals were: TpRI=1.08+/-0.18, TpRII=0.94+/-0.09 and TpRIII=0.96+/-0.20. TpR values were not significantly different from those in the control group (TCGp=1.00+/-0.05). However, TpRI was significantly higher than TpRII (P=0.043). The mean and standard deviation for TdR in the three time intervals were: TdRI=1.10+/-0.41, TdRII=1.05+/-0.15 and TdRIII=1.13+/-0.36. TdR values were not significantly higher than in the control group (TCGd=1.00+/-0.04) (P=0.777). These results support the concept that three-phase bone imaging is able to quantify and determine that activation occurs in the distal femoral and proximal tibial growth plates of fractured femora. This phenomenon may explain the overgrowth observed in this injured bone structure.
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Joubert-Caron R, Le Caër JP, Montandon F, Poirier F, Pontet M, Imam N, Feuillard J, Bladier D, Rossier J, Caron M. Protein analysis by mass spectrometry and sequence database searching: a proteomic approach to identify human lymphoblastoid cell line proteins. Electrophoresis 2000; 21:2566-75. [PMID: 10939474 DOI: 10.1002/1522-2683(20000701)21:12<2566::aid-elps2566>3.0.co;2-f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Lymphoblastoid cell lines correspond to in vitro EBV-immortalized lymphocyte B-cells. These cells display a suitable model for experiments dealing with changes in protein expression occurring upon B-cell differentiation, after drug treatment, or after inhibition of some transcription factors. For all these reasons we have undertaken an effort aimed at developing a hematopoietic cell line protein two-dimensional electrophoresis (2-DE) database, containing B-lymphoblastoid 2-DE maps. In this work, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) peptide mass fingerprinting analysis was adopted for protein identification. The peptide mass fingerprinting identification and the sequence coverage obtained on colloidal Coomassie blue (CBB) stained gel was close to that obtained using zinc-imidazole staining. Everything considered, CBB being more comfortable for subsequent spot manipulations, CBB staining was chosen for identification of a larger number of polypeptides. The results suggest that reticulation of the gel can interfere preventing the uptake of the enzyme during the in-gel digestion step. Consequently, low molecular mass proteins appear more difficult to identify by mass fingerprinting. Finally, the information provided in this study allows the construction of a new annoted reference map of human lymphoblastoid cell proteins. Among the identified proteins 60% were not yet positioned on 2-DE maps in three of the most important well-documented databases. The annoted map will be accessible via Internet on the LBPP server at URL:http:// www-smbh.univ-paris13.fr/lbtp/index.htm.
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Affiliation(s)
- R Joubert-Caron
- Biochimie Cellulaire des Hémopathies Lymphoïdes, Université Paris 13, UFR SMBH, Leonard de Vinici, Bibogny, France.
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49
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Abstract
Previous studies suggest that the effects of ethanol on carbachol-stimulated I(1,4,5)P3 formation and on the number of mAChRs may be independent of each other. The aim of this work was to further study this hypothesis. Human neuroblastoma SH-SY5Y cells were used as a model system. Acute exposure of the cells to 100 mM ethanol induced a decrease in [3H]N-methylscopolamine ([3H]NMS) binding at 30 seconds which was of lower magnitude and of shorter duration than the previously described ethanol-induced inhibition of the peak of carbachol-stimulated I(1,4,5)P3 formation. Long-term ethanol treatment of the cells induced a time- and concentration-dependent increase in [3H]NMS binding. Three hours of 100 mM ethanol treatment were sufficient to increase the number of mAChRs at the cell surface but these receptors were not immediately functionally active, suggesting that they may be newly synthesized. Furthermore, the ethanol-induced potentiation of carbachol-stimulated I(1,4,5)P3 formation, after two days, was, for all ethanol concentrations tested, of higher magnitude than the ethanol-induced increase in mAChR number. Together, these data indicate that both acute and chronic ethanol-induced changes in carbachol-stimulated I(1,4,5)P3 formation may not only be explained by changes in mAChR density at the cell surface but may rather be the consequence of actions of ethanol down-stream of the receptor.
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Affiliation(s)
- M Caron
- Dept of Medical Neurochemistry, Lund University Hospital, Sweden.
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Fouillit M, Joubert-Caron R, Poirier F, Bourin P, Monostori E, Levi-Strauss M, Raphael M, Bladier D, Caron M. Regulation of CD45-induced signaling by galectin-1 in Burkitt lymphoma B cells. Glycobiology 2000; 10:413-9. [PMID: 10764829 DOI: 10.1093/glycob/10.4.413] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
It has been well established that Galectin-1 (GAL1), a beta-galactoside-binding protein, regulates the viability of lymphoid cells. However, the signaling pathway governed by the binding of GAL1 to the cell membrane is not understood. As a first step towards the elucidation of GAL1-initiated signaling events leading to a reduced viability of Burkitt lymphoma B cells, we tried to characterize the initial events induced by the binding of GAL1 to its receptor. This characterization was performed in BL36 cells, a Burkitt lymphoma cell line sensitive to GAL1. The results were as follows: (1) when solubilized cell membrane lysates were affinity bound to immobilized GAL1 and eluted by competition, the tyrosine phosphatase glyco-protein CD45 was found in the eluate, highlighting the role of CD45 as a receptor of GAL1; (2) the phosphatase activity of cell membranes diminished after incubation with GAL1; (3) immunoprecipitation experiments demonstrated that the phosphotyrosine kinase Lyn was dysregulated in cells that have been cultured in medium containing 700 nM GAL1, and (4) that the ratio between two isoforms of Lyn was modified during the treatment with GAL1. The regulation of Lyn therefore seems to be a key event in the action of GAL1.
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Affiliation(s)
- M Fouillit
- Université Paris 13, Biochimie Cellulaire des Hémopathies Lymphoïdes, 93017 Bobigny, France
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