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Lascarrou JB, Dumas F, Bougouin W, Legriel S, Aissaoui N, Deye N, Beganton F, Lamhaut L, Jost D, Vieillard-Baron A, Nichol G, Marijon E, Jouven X, Cariou A, Agostinucci J, Aissaoui-Balanant N, Algalarrondo V, Alla F, Alonso C, Amara W, Annane D, Antoine C, Aubry P, Azoulay E, Beganton F, Billon C, Bougouin W, Boutet J, Bruel C, Bruneval P, Cariou A, Carli P, Casalino E, Cerf C, Chaib A, Cholley B, Cohen Y, Combes A, Coulaud J, Da Silva D, Das V, Demoule A, Denjoy I, Deye N, Diehl J, Dinanian S, Domanski L, Dreyfuss D, Dubois-Rande J, Dumas F, Duranteau J, Empana J, Extramiana F, Fagon J, Fartoukh M, Fieux F, Gandjbakhch E, Geri G, Guidet B, Halimi F, Henry P, Jabre P, Joseph L, Jost D, Jouven X, Karam N, Lacotte J, Lahlou-Laforet K, Lamhaut L, Lanceleur A, Langeron O, Lavergne T, Lecarpentier E, Leenhardt A, Lellouche N, Lemiale V, Lemoine F, Linval F, Loeb T, Ludes B, Luyt C, Mansencal N, Mansouri N, Marijon E, Maury E, Maxime V, Megarbane B, Mekontso-Dessap A, Mentec H, Mira J, Monnet X, Narayanan K, Ngoyi N, Perier M, Piot O, Plaisance P, Plaud B, Plu I, Raphalen J, Raux M, Revaux F, Ricard J, Richard C, Riou B, Roussin F, Santoli F, Schortgen F, Sharshar T, Sideris G, Spaulding C, Teboul J, Timsit J, Tourtier J, Tuppin P, Ursat C, Varenne O, Vieillard-Baron A, Voicu S, Wahbi K, Waldmann V. Differential Effect of Targeted Temperature Management Between 32 °C and 36 °C Following Cardiac Arrest According to Initial Severity of Illness: Insights From Two International Data Sets. Chest 2022; 163:1120-1129. [PMID: 36445800 DOI: 10.1016/j.chest.2022.10.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 06/05/2022] [Revised: 10/10/2022] [Accepted: 10/23/2022] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Recent guidelines have emphasized actively avoiding fever to improve outcomes in patients who are comatose following resuscitation from cardiac arrest (ie, out-of-hospital cardiac arrest). However, whether targeted temperature management between 32 °C and 36 °C (TTM32-36) can improve neurologic outcome in some patients remains debated. RESEARCH QUESTION Is there an association between the use of TTM32-36 and outcome according to severity assessed at ICU admission using a previously derived risk score? STUDY DESIGN AND METHODS Data prospectively collected in the Sudden Death Expertise Center (SDEC) registry (France) between May 2011 and December 2017 and in the Resuscitation Outcomes Consortium Continuous Chest Compressions (ROC-CCC) trial (United States and Canada) between June 2011 and May 2015 were used for this study. Severity at ICU admission was assessed through a modified version of the Cardiac Arrest Hospital Prognosis (mCAHP) score, divided into tertiles of severity. The study explored associations between TTM32-36 and favorable neurologic status at hospital discharge by using multiple logistic regression as well as in tertiles of severity for each data set. RESULTS A total of 2,723 patients were analyzed in the SDEC data set and 4,202 patients in the ROC-CCC data set. A favorable neurologic status at hospital discharge occurred in 728 (27%) patients in the French data set and in 1,239 (29%) patients in the North American data set. Among the French data set, TTM32-36 was independently associated with better neurologic outcome in the tertile of patients with low (adjusted OR, 1.63; 95% CI, 1.15-2.30; P = .006) and high (adjusted OR, 1.94; 95% CI, 1.06-3.54; P = .030) severity according to mCAHP at ICU admission. Similar results were observed in the North American data set (adjusted ORs of 1.36 [95% CI, 1.05-1.75; P = .020] and 2.42 [95% CI, 1.38-4.24; P = .002], respectively). No association was observed between TTM32-36 and outcome in the moderate groups of the two data sets. INTERPRETATION TTM32-36 was significantly associated with a better outcome in patients with low and high severity at ICU admission assessed according to the mCAHP score. Further studies are needed to evaluate individualized temperature control following out-of-hospital cardiac arrest.
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Affiliation(s)
- Jean Baptiste Lascarrou
- Université Paris Cité, INSERM, PARCC, Paris, France; Médecine Intensive Réanimation, University Hospital Center, Nantes, France; AfterROSC Network Group, Paris, France.
| | - Florence Dumas
- Université Paris Cité, INSERM, PARCC, Paris, France; Emergency Department, Cochin University Hospital, APHP, Paris, France
| | - Wulfran Bougouin
- Université Paris Cité, INSERM, PARCC, Paris, France; AfterROSC Network Group, Paris, France; Medical-Surgical Intensive Care Unit, Hopital Privé Jacques Cartier, Massy, France
| | - Stephane Legriel
- Université Paris Cité, INSERM, PARCC, Paris, France; AfterROSC Network Group, Paris, France; Medical Surgical Intensive Care Unit, Mignot Hospital, Le Chesnay, France
| | - Nadia Aissaoui
- Université Paris Cité, INSERM, PARCC, Paris, France; AfterROSC Network Group, Paris, France; Medical Intensive Care Unit, Cochin Hospital (APHP) and University of Paris, Paris, France
| | - Nicolas Deye
- AfterROSC Network Group, Paris, France; Medical Intensive Care Unit, Lariboisière University Hospital, INSERM U942, Paris, France
| | | | - Lionel Lamhaut
- AfterROSC Network Group, Paris, France; SAMU de Paris-DAR Necker University Hospital-Assistance, Paris, France
| | - Daniel Jost
- Brigade des Sapeurs-Pompiers de Paris, Paris, France
| | - Antoine Vieillard-Baron
- Medical Intensive Care Unit, Ambroise Paré University Hospital, APHP, Boulogne-Billancourt, France
| | - Graham Nichol
- University of Washington-Harborview Center for Prehospital Emergency Care, University of Washington, Seattle, WA
| | - Eloi Marijon
- Université Paris Cité, INSERM, PARCC, Paris, France
| | | | - Alain Cariou
- Université Paris Cité, INSERM, PARCC, Paris, France; AfterROSC Network Group, Paris, France; Medical Intensive Care Unit, Cochin Hospital (APHP) and University of Paris, Paris, France
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Vialatte de Pémille C, Ray A, Michel A, Stefano F, Yim T, Bruel C, Zuber M. Prevalence and prospective evaluation of cognitive dysfunctions after SARS due to SARS-CoV-2 virus. The COgnitiVID study. Rev Neurol (Paris) 2022; 178:802-807. [PMID: 35610098 PMCID: PMC9123423 DOI: 10.1016/j.neurol.2022.03.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 03/03/2022] [Accepted: 03/21/2022] [Indexed: 01/08/2023]
Affiliation(s)
- C Vialatte de Pémille
- Neurological department, groupe hospitalier Paris Saint-Joseph, Paris, France; Université Paris Cité, Paris, France.
| | - A Ray
- Neurological department, groupe hospitalier Paris Saint-Joseph, Paris, France; Université Paris Cité, Paris, France
| | - A Michel
- Neurological department, groupe hospitalier Paris Saint-Joseph, Paris, France
| | - F Stefano
- Neurological department, groupe hospitalier Paris Saint-Joseph, Paris, France
| | - T Yim
- Neurological department, groupe hospitalier Paris Saint-Joseph, Paris, France
| | - C Bruel
- Intensive care unit, groupe hospitalier Paris Saint-Joseph, Paris, France
| | - M Zuber
- Neurological department, groupe hospitalier Paris Saint-Joseph, Paris, France; Université Paris Cité, Paris, France
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Sánchez Ruiz MA, Adonias G, Robaglia-Schlupp A, Rapilly F, Chabert M, Ramalli L, Reilhes O, Bruel C, Malfait P, Chaud P. Effectiveness of mRNA BNT162b2 COVID-19 vaccine against SARS-CoV-2 Delta variant among elderly residents from a long-term care facility, South of France, May 2021. Eur Rev Med Pharmacol Sci 2022; 26:2586-2591. [PMID: 35442474 DOI: 10.26355/eurrev_202204_28496] [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: 06/14/2023]
Abstract
OBJECTIVE Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Delta variant was classified as a variant of concern in May 2021 due to its increased transmissibility. It became dominant in Europe during the summer, raising concerns on the effectiveness of vaccines. We assessed the vaccine effectiveness (VE) of mRNA BNT162b2 (BioNTech-Pfizer) against SARS-CoV-2 Delta variant during an outbreak affecting long-term care facility (LTCF) residents in southern France, May 2021. MATERIALS AND METHODS We conducted a retrospective cohort study among LTCF residents. We described sex, age, dependency level, reverse transcription PCR and sequencing results, clinical evolution, vaccination status. We compared attack rates of SARS-CoV-2 infection, symptomatic coronavirus disease 2019 (COVID-19), and severe COVID-19 (respiratory support, hospitalization, and/or death) by vaccination status (two doses administered vs. none) to estimate VE (1 - Relative Risk [RR]) with 95% confidence intervals (CI). VE was adjusted by age (Poisson regression). RESULTS Among 72 LTCF residents, 75.0% (n=54) were women, mean age was 88.7 (SD 8.1) years, 69% (n=49/71) were severely dependent. SARS-CoV-2 infections were identified in 39 residents (54.2%), 11 with symptomatic, and eight with severe COVID-19. All sequenced samples (n=19, 48.7%) had the same Delta variant genomic sequence. Age-adjusted BNT162b2 VE against SARS-CoV-2 Delta variant infection was 11.2% (95% CI: 0.0-61.1%), it was 88.4% (95% CI: 59.9-96.7%) against symptomatic, and 93.5% (95% CI: 67.2-98.7%) against severe COVID-19. CONCLUSIONS We found a high BNT162b2 VE against symptomatic and severe COVID-19 caused by SARS-CoV-2 Delta variant among LTCF elderly residents, but not against Delta variant infection. This supports vaccination rollout and the implementation of control measures for close contacts among vaccinated LTCF elderly residents.
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Affiliation(s)
- M A Sánchez Ruiz
- Santé Publique France, Regional office of the French National Public Health Agency in Provence-Alpes-Côte d'Azur and Corsica, Saint-Maurice, France.
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Bonhomme S, Ostrowka C, Belaifa K, Marteau V, Bruel C, Jouffroy P, Riouallon G. Screening for venous thrombotic events in patients presenting with pelvis and acetabular fractures: A new practice based on a prospective study. Thrombosis Update 2021. [DOI: 10.1016/j.tru.2021.100091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Pilmis B, Mizrahi A, Péan de Ponfilly G, Philippart F, Bruel C, Zahar JR, Le Monnier A. Relative faecal abundance of extended-spectrum β-lactamase-producing Enterobacterales and its impact on infections among intensive care unit patients: a pilot study. J Hosp Infect 2021; 112:92-95. [PMID: 33794294 DOI: 10.1016/j.jhin.2021.03.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 12/15/2020] [Revised: 03/05/2021] [Accepted: 03/05/2021] [Indexed: 12/15/2022]
Abstract
This pilot prospective study assessed the association between the faecal relative abundance of extended-spectrum β-lactamase-producing Enterobacterales (ESBL-PE) and the occurrence of ESBL-PE related infections. Twenty-four patients were included. The median ESBL relative abundance was 32.4%. The mean ESBL-PE relative abundance (ESBL-PE-RA) was more than five-fold higher in patients exposed during the last three months to antibiotics (P = 0.002). Furthermore, the mean ESBL relative abundance was more than two-fold higher in patients colonized with non-E. coli strains (P = 0.044). The mean ESBL-PE-RA was more than 10-fold higher for the concordant patients than for the discordant patients (59.1% vs 4.9%; P < 0.001).
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Affiliation(s)
- B Pilmis
- Équipe mobile de microbiologie clinique, Groupe Hospitalier Paris Saint-Joseph, Paris, France; Service de maladies infectieuses et tropicales, Hôpital Necker - Enfants Malades, Paris, France; Institut Micalis UMR 1319, Université Paris - Saclay, INRAe, AgroParisTech, Châtenay Malabry, France.
| | - A Mizrahi
- Institut Micalis UMR 1319, Université Paris - Saclay, INRAe, AgroParisTech, Châtenay Malabry, France; Service de microbiologie clinique et plateforme de dosage des anti-infectieux, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - G Péan de Ponfilly
- Service de microbiologie clinique et plateforme de dosage des anti-infectieux, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - F Philippart
- Service de réanimation, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - C Bruel
- Service de réanimation, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - J-R Zahar
- Service de Microbiologie Clinique et Unité de Contrôle et de Prévention du risque Infectieux, Groupe Hospitalier Paris Seine Saint-Denis, AP-HP, Bobigny, France; IAME, UMR 1137, Université Paris 13, Sorbonne Paris Cité, France
| | - A Le Monnier
- Institut Micalis UMR 1319, Université Paris - Saclay, INRAe, AgroParisTech, Châtenay Malabry, France; Service de microbiologie clinique et plateforme de dosage des anti-infectieux, Groupe Hospitalier Paris Saint-Joseph, Paris, France
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Toledano-Massiah S, Badat N, Leberre A, Bruel C, Ray A, Gerber S, Zins M, Hodel J. Unusual Brain MRI Pattern in 2 Patients with COVID-19 Acute Respiratory Distress Syndrome. AJNR Am J Neuroradiol 2020; 41:2204-2205. [PMID: 32883665 DOI: 10.3174/ajnr.a6817] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 08/03/2020] [Indexed: 02/01/2023]
Abstract
We report the cases of 2 patients hospitalized in our intensive care unit with confirmed coronavirus disease 2019 infection in whom brain MR imaging showed an unusual DWI pattern with nodular and ring-shaped lesions involving the periventricular and deep white matter. We discuss the possible reasons for these findings and their relationship to the infection.
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Affiliation(s)
- S Toledano-Massiah
- From the Department of Radiology (S.T.-M., N.B., A.L., S.G., M.Z., J.H.)
| | - N Badat
- From the Department of Radiology (S.T.-M., N.B., A.L., S.G., M.Z., J.H.)
| | - A Leberre
- From the Department of Radiology (S.T.-M., N.B., A.L., S.G., M.Z., J.H.)
| | | | - A Ray
- Neurology (A.R.), Fondation Hôpital Saint-Joseph, Paris, France
| | - S Gerber
- From the Department of Radiology (S.T.-M., N.B., A.L., S.G., M.Z., J.H.)
| | - M Zins
- From the Department of Radiology (S.T.-M., N.B., A.L., S.G., M.Z., J.H.)
| | - J Hodel
- From the Department of Radiology (S.T.-M., N.B., A.L., S.G., M.Z., J.H.)
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Torres Castillo CS, Bruel C, Tavares JR. Chemical affinity and dispersibility of boron nitride nanotubes. Nanoscale Adv 2020; 2:2497-2506. [PMID: 36133361 PMCID: PMC9419523 DOI: 10.1039/d0na00136h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 05/04/2020] [Indexed: 05/09/2023]
Abstract
Boron nitride nanotubes (BNNTs) are electrically insulating nanoparticles that display highly competitive elastic modulus and thermal conductivity. Long presented as potential fillers for nanocomposite applications, their poor dispersibility in most commodity polymers has, however, limited their spread. In this work, the chemical affinity of purified BNNTs, measured in terms of Hansen solubility parameters (HSP), were obtained through sedimentation tests in a wide set of organic solvents, taking into account relative sedimentation time. The parameters obtained were {δ d; δ p; δ h} = {16.8; 10.7; 14.7} ± {0.3; 0.9; 0.3} MPa1/2, with a Hildebrand parameter, δ t = 24.7 MPa1/2 and a sphere radius of 5.4 MPa1/2. The solubility parameters were determined considering complete dispersion of the purified nanomaterial, as well as the viscosity and density of the host solvent. These factors, combined with the high purity of the BNNTs, are crucial to minimize the uncertainty of the HSP characterization. Such refined values provide necessary insights both to optimize the solvent casting of unmodified BNNTs, and to orient the surface modification efforts that would be needed to integrate these nanomaterials into a wider range of host matrices.
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Affiliation(s)
- C S Torres Castillo
- CREPEC, Chemical Engineering Department, Polytechnique Montréal 2900 Edouard Montpetit Blvd Montréal Québec QC H3T 1J4 Canada
| | - C Bruel
- CREPEC, Chemical Engineering Department, Polytechnique Montréal 2900 Edouard Montpetit Blvd Montréal Québec QC H3T 1J4 Canada
| | - J R Tavares
- CREPEC, Chemical Engineering Department, Polytechnique Montréal 2900 Edouard Montpetit Blvd Montréal Québec QC H3T 1J4 Canada
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Degroote T, Chhor V, Tran M, Philippart F, Bruel C. Cholécystite aiguë de réanimation. Méd Intensive Réa 2019. [DOI: 10.3166/rea-2019-0130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
La cholécystite aiguë de réanimation (0,2 à 1 % des patients) est liée à des facteurs de risque spécifiques (jeûne, nutrition parentérale, ventilation mécanique) et systémiques (instabilité, brûlures graves, catécholamines) conduisant à des phénomènes d’ischémie-reperfusion de la paroi vésiculaire, à l’origine d’une cholécystite classiquement alithiasique. Toutefois, les données récentes retrouvent une participation lithiasique dans 50%des cas environ. Il s’agit d’une maladie grave dont le diagnostic est difficile et la mortalité élevée (40 %). Chez ces patients graves, aucun critère clinicobiologique ne permet un diagnostic de certitude. L’imagerie du patient de réanimation peut être prise à défaut par les anomalies fréquemment retrouvées en réanimation ; les signes les plus évocateurs sont un épaississement pariétal vésiculaire supérieur à 4 mm, un hydrocholécyste ou un défaut de rehaussement de la paroi au scanner. Le traitement en urgence repose sur une antibiothérapie à large spectre ciblée sur les germes digestifs et nosocomiaux ainsi que sur une optimisation hémodynamique. La cholécystectomie (laparoscopique, voire sous-costale) représente le traitement de référence en empêchant la récidive. Mais la gravité des patients amène souvent à envisager une solution moins lourde que la chirurgie avec un drainage de la vésicule. Le drainage par voie percutanée est l’alternative de choix en raison de sa disponibilité et de son efficacité, il existe toutefois un risque théorique de récidive à l’ablation du drain, surtout en cas de cholécystite lithiasique. Le drainage interne par voie endoscopique (transpapillaire ou transdigestif) est une possibilité prometteuse, mais réservée à l’heure actuelle aux centres experts.
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Bougouin W, Dumas F, Lamhaut L, Marijon E, Carli P, Combes A, Pirracchio R, Aissaoui N, Karam N, Deye N, Sideris G, Beganton F, Jost D, Cariou A, Jouven X, Adnet F, Agostinucci JM, Aissaoui-Balanant N, Algalarrondo V, Alla F, Alonso C, Amara W, Annane D, Antoine C, Aubry P, Azoulay E, Beganton F, Benhamou D, Billon C, Bougouin W, Boutet J, Bruel C, Bruneval P, Cariou A, Carli P, Casalino E, Cerf C, Chaib A, Cholley B, Cohen Y, Combes A, Crahes M, Da Silva D, Das V, Demoule A, Denjoy I, Deye N, Dhonneur G, Diehl JL, Dinanian S, Domanski L, Dreyfuss D, Duboc D, Dubois-Rande JL, Dumas F, Empana JP, Extramiana F, Fartoukh M, Fieux F, Gabbas M, Gandjbakhch E, Geri G, Guidet B, Halimi F, Henry P, Hidden Lucet F, Jabre P, Jacob L, Joseph L, Jost D, Jouven X, Karam N, Kassim H, Lacotte J, Lahlou-Laforet K, Lamhaut L, Lanceleur A, Langeron O, Lavergne T, Lecarpentier E, Leenhardt A, Lellouche N, Lemiale V, Lemoine F, Linval F, Loeb T, Ludes B, Luyt CE, Maltret A, Mansencal N, Mansouri N, Marijon E, Marty J, Maury E, Maxime V, Megarbane B, Mekontso-Dessap A, Mentec H, Mira JP, Monnet X, Narayanan K, Ngoyi N, Perier MC, Piot O, Pirracchio R, Plaisance P, Plu I, Raux M, Revaux F, Ricard JD, Richard C, Riou B, Roussin F, Santoli F, Schortgen F, Sharifzadehgan A, Sideris G, Spaulding C, Teboul JL, Timsit JF, Tourtier JP, Tuppin P, Ursat C, Varenne O, Vieillard-Baron A, Voicu S, Wahbi K, Waldmann V. Extracorporeal cardiopulmonary resuscitation in out-of-hospital cardiac arrest: a registry study. Eur Heart J 2019; 41:1961-1971. [DOI: 10.1093/eurheartj/ehz753] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 03/26/2019] [Accepted: 10/01/2019] [Indexed: 11/13/2022] Open
Abstract
Abstract
Aims
Out-of-hospital cardiac arrest (OHCA) without return of spontaneous circulation (ROSC) despite conventional resuscitation is common and has poor outcomes. Adding extracorporeal membrane oxygenation (ECMO) to cardiopulmonary resuscitation (extracorporeal-CPR) is increasingly used in an attempt to improve outcomes.
Methods and results
We analysed a prospective registry of 13 191 OHCAs in the Paris region from May 2011 to January 2018. We compared survival at hospital discharge with and without extracorporeal-CPR and identified factors associated with survival in patients given extracorporeal-CPR. Survival was 8% in 525 patients given extracorporeal-CPR and 9% in 12 666 patients given conventional-CPR (P = 0.91). By adjusted multivariate analysis, extracorporeal-CPR was not associated with hospital survival [odds ratio (OR), 1.3; 95% confidence interval (95% CI), 0.8–2.1; P = 0.24]. By conditional logistic regression with matching on a propensity score (including age, sex, occurrence at home, bystander CPR, initial rhythm, collapse-to-CPR time, duration of resuscitation, and ROSC), similar results were found (OR, 0.8; 95% CI, 0.5–1.3; P = 0.41). In the extracorporeal-CPR group, factors associated with hospital survival were initial shockable rhythm (OR, 3.9; 95% CI, 1.5–10.3; P = 0.005), transient ROSC before ECMO (OR, 2.3; 95% CI, 1.1–4.7; P = 0.03), and prehospital ECMO implantation (OR, 2.9; 95% CI, 1.5–5.9; P = 0.002).
Conclusions
In a population-based registry, 4% of OHCAs were treated with extracorporeal-CPR, which was not associated with increased hospital survival. Early ECMO implantation may improve outcomes. The initial rhythm and ROSC may help select patients for extracorporeal-CPR.
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Affiliation(s)
- Wulfran Bougouin
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Medical-Surgical Intensive Care Unit, Ramsay Générale de Santé, Hôpital Privé Jacques Cartier, 6 Avenue du Noyer Lambert, 91300 Massy, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- AfterROSC network, 27 Rue du Faubourg Saint-Jacques, 75014 Paris, France
| | - Florence Dumas
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Emergency Department, Cochin-Hotel-Dieu Hospital, APHP, 27 Rue du Faubourg Saint-Jacques, 75014 Paris, France
| | - Lionel Lamhaut
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- AfterROSC network, 27 Rue du Faubourg Saint-Jacques, 75014 Paris, France
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Intensive Care Unit - SAMU 75, Necker-Enfants-Malades Hospital, APHP, 149 Rue de Sèvres, 75015 Paris, France
| | - Eloi Marijon
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Cardiology Department, Georges Pompidou European Hospital, AP-HP, 20 Rue Leblanc, 75015 Paris, France
| | - Pierre Carli
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Intensive Care Unit - SAMU 75, Necker-Enfants-Malades Hospital, APHP, 149 Rue de Sèvres, 75015 Paris, France
| | - Alain Combes
- Medical-Surgical Intensive Care Unit, iCAN, Institute of Cardiometabolism and Nutrition, Pitié-Salpétrière Hospital, APHP, 47-83 Boulevard de l'Hôpital, 75013 Paris, France
| | - Romain Pirracchio
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Surgical ICU, Georges Pompidou European Hospital, AP-HP, 20 Rue Leblanc, 75015 Paris, France
| | - Nadia Aissaoui
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- AfterROSC network, 27 Rue du Faubourg Saint-Jacques, 75014 Paris, France
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Medical ICU, Georges Pompidou European Hospital, AP-HP, 20 Rue Leblanc, 75015 Paris, France
| | - Nicole Karam
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Cardiology Department, Georges Pompidou European Hospital, AP-HP, 20 Rue Leblanc, 75015 Paris, France
| | - Nicolas Deye
- AfterROSC network, 27 Rue du Faubourg Saint-Jacques, 75014 Paris, France
- Medical ICU, Lariboisière Hospital, AP-HP, 2 Rue Ambroise Paré, 75010 Paris, France
| | - Georgios Sideris
- Cardiology Department, Lariboisière Hospital, AP-HP, 2 Rue Ambroise Paré, 75010 Paris, France
| | - Frankie Beganton
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
| | - Daniel Jost
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- Brigade de Sapeurs Pompiers de Paris (BSPP), 1 Place Jules Renard, 75017 Paris, France
| | - Alain Cariou
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- AfterROSC network, 27 Rue du Faubourg Saint-Jacques, 75014 Paris, France
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Medical Intensive Care Unit, Cochin Hospital, APHP, 27 Rue du Faubourg Saint-Jacques, 75014 Paris, France
| | - Xavier Jouven
- Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, 56 rue Leblanc, 75787 Paris, France
- Paris Sudden Death Expertise Center, 56 rue Leblanc, 75787 Paris, France
- Université Paris Descartes-Sorbonne Paris Cité, 12 Rue de l'École de Médecine, 75006 Paris, France
- Cardiology Department, Georges Pompidou European Hospital, AP-HP, 20 Rue Leblanc, 75015 Paris, France
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Garrouste-Orgeas M, Max A, Grégoire C, Ruckly S, Kloeckner M, Brochon S, Pichot E, Simons C, El Mhadri M, Bruel C, Philippart F, Fournier J, Tiercelet K, Timsit JF, Misset B. IMPACT OF PROACTIVE NURSE PARTICIPATION IN ICU FAMILY CONFERENCES: A MIXED-METHOD STUDY. Intensive Care Med Exp 2015. [PMCID: PMC4798577 DOI: 10.1186/2197-425x-3-s1-a929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Abstract
Bed bugs are hematophagous insects responsible for a re-emerging and challenging indoor pest in many countries. Bed bugs infestations may have health consequences including nuisance biting, cutaneous and systemic reactions. This resurgence can probably be attributed to factors such as increased international travel and development of resistance against insecticides. Resistance against pyrethroids has been reported several times from the USA and rarely in Europe. In France, very few data on bed bugs are available. The present study aimed to assess the infestation by bed bugs of a complex of two high-rise apartment buildings in the suburb of Paris and to evaluate their susceptibility to pyrethroid insecticides. We inspected for bed bugs 192 out of 198 apartments units (97%) and interviewed their residents. 76 (39.6%) apartments were infested. Among the 97 residents living in infested apartments, 53 (54.6%) reported bed bug bites. A total of 564 bed bugs were collected in the infested units. Bioassays showed that 54 out of 143 bed bugs were resistant to pyrethroids (37.8%; 95% confidence interval: 29.9-45.7%). DNA sequencing showed that all bed bugs tested (n = 124) had homozygous L925I kdr-like gene mutation. The level of pyrethroid resistance found indicates that this phenomenon was already established in the site and prompts the need to reevaluate the wide use of pyrethroids to control bed bugs.
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Affiliation(s)
- R Durand
- Laboratoire de Parasitologie-Mycologie, Hôpital Avicenne, Assistance Publique-Hôpitaux de Paris, France
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12
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Vignier N, Couzigou C, Nguyen Van JC, Gerber S, Gaillard S, Bruel C, Misset B, Kitzis MD, Le Monnier A. Diagnosis and treatment strategies for community-acquired Streptococcus salivarius meningitis. Med Mal Infect 2013; 44:42-4. [PMID: 24274977 DOI: 10.1016/j.medmal.2013.10.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 09/09/2013] [Accepted: 10/21/2013] [Indexed: 11/30/2022]
Affiliation(s)
- N Vignier
- Équipe mobile de microbiologie clinique/équipe opérationnelle d'hygiène, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France; Unité de microbiologie clinique, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France
| | - C Couzigou
- Équipe mobile de microbiologie clinique/équipe opérationnelle d'hygiène, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France; Unité de microbiologie clinique, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France.
| | - J C Nguyen Van
- Unité de microbiologie clinique, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France
| | - S Gerber
- Service de radiologie, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France
| | - S Gaillard
- Service de neurochirurgie, hôpital Foch, 40, rue Worth, 92151 Suresnes, France
| | - C Bruel
- Service de réanimation polyvalente, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France
| | - B Misset
- Service de réanimation polyvalente, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France
| | - M D Kitzis
- Unité de microbiologie clinique, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France
| | - A Le Monnier
- Unité de microbiologie clinique, groupe hospitalier Paris Saint-Joseph, 75014 Paris, France
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13
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Garrouste-Orgeas M, Tabah A, Vesin A, Philippart F, Kpodji A, Bruel C, Grégoire C, Max A, Timsit JF, Misset B. The ETHICA study (part II): simulation study of determinants and variability of ICU physician decisions in patients aged 80 or over. Intensive Care Med 2013; 39:1574-83. [PMID: 23765237 DOI: 10.1007/s00134-013-2977-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 05/19/2013] [Indexed: 01/01/2023]
Abstract
PURPOSE To assess physician decisions about ICU admission for life-sustaining treatments (LSTs). METHODS Observational simulation study of physician decisions for patients aged ≥80 years. Each patient was allocated at random to four physicians who made decisions based on actual bed availability and existence of an additional bed before and after obtaining information on patient preferences. The simulations involved non-invasive ventilation (NIV), invasive mechanical ventilation (IMV), and renal replacement therapy after a period of IMV (RRT after IMV). RESULTS The physician participation rate was 100/217 (46 %); males without religious beliefs predominated, and median ICU experience was 9 years. Among participants, 85.7, 78, and 62 % felt that NIV, IMV, or RRT (after IMV) was warranted, respectively. By logistic regression analysis, factors associated with admission were age <85 years, self-sufficiency, and bed availability for NIV and IMV. Factors associated with IMV were previous ICU stay (OR 0.29, 95 % CI 0.13-0.65, p = 0.01) and cancer (OR 0.23, 95 % CI 0.10-0.52, p = 0.003), and factors associated with RRT (after IMV) were living spouse (OR 2.03, 95 % CI 1.04-3.97, p = 0.038) and respiratory disease (OR 0.42, 95 % CI 0.23-0.76, p = 0.004). Agreement among physicians was low for all LSTs. Knowledge of patient preferences changed physician decisions for 39.9, 56, and 57 % of patients who disagreed with the initial physician decisions for NIV, IMV, and RRT (after IMV) respectively. An additional bed increased admissions for NIV and IMV by 38.6 and 13.6 %, respectively. CONCLUSIONS Physician decisions for elderly patients had low agreement and varied greatly with bed availability and knowledge of patient preferences.
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Affiliation(s)
- M Garrouste-Orgeas
- Medical-Surgical, Saint Joseph Hospital Network, 185 rue Raymond Losserand, 75014, Paris, France.
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14
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Philippart F, Vesin A, Bruel C, Kpodji A, Durand-Gasselin B, Garçon P, Levy-Soussan M, Jagot JL, Calvo-Verjat N, Timsit JF, Misset B, Garrouste-Orgeas M. The ETHICA study (part I): elderly's thoughts about intensive care unit admission for life-sustaining treatments. Intensive Care Med 2013; 39:1565-73. [PMID: 23765236 DOI: 10.1007/s00134-013-2976-y] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 05/19/2013] [Indexed: 12/01/2022]
Abstract
PURPOSE To assess preferences among individuals aged ≥80 years for a future hypothetical critical illness requiring life-sustaining treatments. METHODS Observational cohort study of consecutive community-dwelling elderly individuals previously hospitalised in medical or surgical wards and of volunteers residing in nursing homes or assisted-living facilities. The participants were interviewed at their place of residence after viewing films of scenarios involving the use of non-invasive mechanical ventilation (NIV), invasive mechanical ventilation (IMV), and renal replacement therapy after a period of invasive mechanical ventilation (RRT after IMV). Demographic, clinical, and quality-of-life data were collected. Participants chose among four responses regarding life-sustaining treatments: consent, refusal, no opinion, and letting the physicians decide. RESULTS The sample size was 115 and the response rate 87 %. Mean participant age was 84.8 ± 3.5 years, 68 % were female, and 81 % and 71 % were independent for instrumental activities and activities of daily living, respectively. Refusal rates among the elderly were 27 % for NIV, 43 % for IMV, and 63 % for RRT (after IMV). Demographic characteristics associated with refusal were married status for NIV [relative risk (RR), 2.9; 95 % confidence interval (95 %CI), 1.5-5.8; p = 0.002] and female gender for IMV (RR, 2.4; 95 %CI, 1.2-4.5; p = 0.01) and RRT (after IMV) (RR, 2.7; 95 %CI, 1.4-5.2; p = 0.004). Quality of life was associated with choices regarding all three life-sustaining treatments. CONCLUSIONS Independent elderly individuals were rather reluctant to accept life-sustaining treatments, especially IMV and RRT (after IMV). Their quality of life was among the determinants of their choices.
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Affiliation(s)
- F Philippart
- Medical-Surgical, Saint Joseph Hospital Network, 75014, Paris, France
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15
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D’aligny L, Brasme H, Gerber S, Bruel C, Join-Lambert C, Zuber M. Méningo encéphalites à HSV2 : particularités cliniques et paracliniques-comparaison aux atteintes liés à HSV1. Rev Neurol (Paris) 2013. [DOI: 10.1016/j.neurol.2013.01.076] [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: 11/26/2022]
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Misset B, Bruel C, Touati S, Dumain M, Moulard ML, Philippart F, Garrouste-Orgeas M, Carlet J. 168 Impact of morbidity and mortality conferences on the incidence of adverse events in an intensive care unit (ICU). BMJ Qual Saf 2010. [DOI: 10.1136/qshc.2010.041624.22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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17
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Alvarez A, Mourvillier B, Bout H, Bruel C, Ferreira L, Lakhal K, Pajot O, Bouadma L, Regnier B, Wolff M. P1206 Repeated lumbar puncture in patients with pneumococcal meningitis: practical or anxiolytic relevance? Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)71046-4] [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: 11/16/2022]
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18
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Bruel C, Cha K, Niu L, Reeves PJ, Khorana HG. Rhodopsin kinase: two mAbs binding near the carboxyl terminus cause time-dependent inactivation. Proc Natl Acad Sci U S A 2000; 97:3010-5. [PMID: 10737782 PMCID: PMC16183 DOI: 10.1073/pnas.97.7.3010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Two mAbs generated against rhodopsin kinase (RK) were characterized for their epitopes. Both antibodies recognize short peptide sequences, overlapping but distinct, close to the carboxyl terminus. Binding of RK to the antibodies is slow. Attempts were made to use the antibodies immobilized on protein A-Sepharose beads to bind and purify the enzyme. Time-dependent inactivation of the enzyme occurred after its binding to the antibodies. Studies using different conditions to maintain the enzyme in the active form during binding or to reactivate the purified inactivated enzyme were unsuccessful.
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Affiliation(s)
- C Bruel
- Departments of Biology and Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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19
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Abstract
A suitable system for expression of the rhodopsin kinase (RK) gene and its mutants is needed for structure-function studies of RK. Previously, investigation of the baculovirus system showed satisfactory production of RK, but posttranslational isoprenylation was deficient. We now report on a comparative study of expression of the RK gene in yeast (Pichia pastoris), COS-1 cells and in an HEK293 stable cell line. Expression in COS-1 cells, by using pCMV5 vector, is the most satisfactory. A two-step procedure for purification of the expressed enzyme with an N-terminal histidine tag has been developed. The purified enzyme has correct posttranslational modifications and shows a somewhat broader pH vs. catalytic activity profile than the wild-type enzyme.
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Affiliation(s)
- C Bruel
- Departments of Biology and Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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20
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Wang Y, Bruel C, Yan L, Beattie DS. Exogenous ubiquinol analogues affect the fluorescence of NCD-4 bound to aspartate-160 of yeast cytochrome b. J Bioenerg Biomembr 1998; 30:455-64. [PMID: 9932648 DOI: 10.1023/a:1020590113470] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Previously, we reported that the carboxyl-reacting reagent DCCD, and its fluorescent derivative NCD-4 binds covalently to aspartate-160 localized in amphipathic helix cd of the CD loop connecting membrane-spanning helices C and D of cytochrome b (Wang et al., 1995). We have investigated the fluorescent properties of NCD-4 to probe possible changes in the cd helix resulting from the binding of exogenous ubiquinol analogues to the bc1 complex. Preincubation of the bc1 complex with the reduced substrate analogues, DQH2, DBH2, and Q6H2 resulted in 20-40% increase in the fluorescence emission intensity of NCD-4 and a 10-20% increase in the binding of [14C]DCCD to the bc1 complex. By contrast, preincubation with the oxidized analogues DQ. DB, and Q6 resulted in a 20-40% decrease in the fluorescence emission intensity of NCD-4 and a 20-40% decrease in the binding of [14C]DCCD to the bc1 complex. Moreover, addition of the reduced ubiquinols to the bc1 complex preincubated with NCD-4 resulted in a blue shift in the fluorescence emission spectrum. In addition, incubation of the cytochrome bc1 complex reconstituted into proteoliposomes with both reduced and oxidized ubiquinol analogues resulted in changes in the quenching of NCD-4 fluorescence by CAT-16, the spin-label probe that intercalates at the membrane surface. These results indicate that the addition of exogenous ubiquinol to the bc1 complex may result in changes in the cd helix leading to a more hydrophobic environment surrounding the NCD-4 binding site. By contrast, preincubation with the inhibitors of electron transfer through the bc1 complex had no effect on the binding of NCD-4 to the bc1 complex or on the fluorescent emission spectra, which suggests that the binding of the inhibitors does not result in changes in the environment of the NCD-4 binding site.
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Affiliation(s)
- Y Wang
- Department of Biochemistry, West Virginia University School of Medicine, Morgantown 26506-9142, USA
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21
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Cha K, Bruel C, Inglese J, Khorana HG. Rhodopsin kinase: expression in baculovirus-infected insect cells, and characterization of post-translational modifications. Proc Natl Acad Sci U S A 1997; 94:10577-82. [PMID: 9380677 PMCID: PMC23407 DOI: 10.1073/pnas.94.20.10577] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/21/1997] [Indexed: 02/05/2023] Open
Abstract
Structure-function studies of rhodopsin kinase (RK; EC 2.7.1.125) require a variety of mutants. Therefore, there is need for a suitable system for the expression of RK mutant genes. Here we report on a study of expression of the RK gene in baculovirus-infected Sf21 cells and characterization of the enzyme produced as purified to near homogeneity. Particular attention has been paid to the post-translational modifications, autophosphorylation and isoprenylation, found in the native bovine RK. The protein produced has been purified using, successively, heparin-Sepharose, Mono Q, and Mono S FPLC (fast protein liquid chromatography) and was obtained in amounts of about 2 mg from 1 liter of cell culture. The enzyme from the last step of purification was obtained in two main fractions that differ in the level of phosphorylation. The protein peak eluted first carries two phosphate groups per protein, whereas the second protein peak is monophosphorylated. Further, while both peaks are isoprenylated, the isoprenyl groups consist of mixtures of C5, C10, C15, and C20 isoprenyl moieties. From these results, we conclude that the above expression system is suitable for some but not all aspects of structure-function studies.
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Affiliation(s)
- K Cha
- Departments of Biology and Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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22
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di Rago JP, Bruel C, Graham LA, Slonimski P, Trumpower BL. Heterologous complementation of a Rieske iron-sulfur protein-deficient Saccharomyces cerevisiae by the Rip1 gene of Schizosaccharomyces pombe. J Biol Chem 1996; 271:15341-5. [PMID: 8663290 DOI: 10.1074/jbc.271.26.15341] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
A cDNA carrying the Rip1 gene, which encodes the Rieske iron-sulfur protein of Schizosaccharomyces pombe, has been cloned by complementing the respiratory deficiency of a Saccharomyces cerevisiae strain in which the endogenous copy of the RIP1 gene has been deleted. The deduced amino acid sequences of the S. pombe and S. cerevisiae iron-sulfur proteins are 50% identical, with the highest region of identity being in the C termini of the proteins, where the 2Fe:2S cluster is bound. When expressed in the S. cerevisiae deletion strain, the S. pombe iron-sulfur protein restores 25-30% of the ubiquinol-cytochrome c reductase activity. The kinetics of cytochrome c reduction, the effects of inhibitors which act at defined sites in the cytochrome bc1 complex, and the optical properties of cytochrome b in membranes from the S. cerevisiae deletion strain complemented with S. pombe iron-sulfur protein indicate that the S. pombe protein interacts with cytochrome b to restore an apparently normal ubiquinol oxidase site, but that interaction between the iron-sulfur protein and cytochrome c1 is partially impaired. This is the first heterologous replacement of an electron transfer protein in a respiratory enzyme complex in S. cerevisiae.
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Affiliation(s)
- J P di Rago
- Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA
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23
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Bruel C, Brasseur R, Trumpower BL. Subunit 8 of the Saccharomyces cerevisiae cytochrome bc1 complex interacts with succinate-ubiquinone reductase complex. J Bioenerg Biomembr 1996; 28:59-68. [PMID: 8786239] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We have investigated the function of subunit 8 of the cytochrome bc1 complex by generating six site-directed mutants, F46C, R51S, P62V, G64A, R91N, and W69-stop, in the cloned QCR8 gene and expressing the mutated genes in a Saccharomyces cerevisiae strain in which the chromosomal copy of QCR8 is deleted. The W69-stop mutation impairs assembly of the bc1 complex and growth of yeast on nonfermentable carbon sources as does deletion of QCR8 [Maarse, A. C., De Haan, M., Schoppink, P. J., Berden J. A., and Grivell, L. A. (1988) Eur. J. Biochem. 172, 179-184], implying that the C-terminus of subunit 8 is important for assembly and/or the stability of the bc1 complex. The F46C, R51S, P62V, G64A, and R91N mutations do not affect the growth of yeast on nonfermentable carbon sources, not do they lower the activity or alter the inhibitor sensitivity of the bc1 complex. Rather, some of the mutations increase the cytochrome C reductase activity of the bc1 complex by as much as 40%. However, succinate-ubiquinone reductase activity was consistently reduced 40-60% in mitochondrial membranes from these mutants, while NADH-ubiquinone reductase activity was not affected. In addition, the activation of succinate-ubiquinone reductase activity by succinate was diminished by the F46C, R51S, P62V, and G64A mutations. These results indicate that the cytochrome bc1 complex participates in electron transfer from succinate to ubiquinone in situ and also suggest an interaction between succinate-ubiquinone reductase and cytochrome bc1 complex which involves subunit 8 of the bc1 complex.
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Affiliation(s)
- C Bruel
- Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA
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24
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Bruel C, Manon S, Guérin M, Lemesle-Meunier D. Decoupling of the bc1 complex in S. cerevisiae; point mutations affecting the cytochrome b gene bring new information about the structural aspect of the proton translocation. J Bioenerg Biomembr 1995; 27:527-39. [PMID: 8718457 DOI: 10.1007/bf02110192] [Citation(s) in RCA: 22] [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] [Indexed: 02/01/2023]
Abstract
Four mutations in the mitochondrial cytochrome b of S. cerevisiae have been characterized with respect to growth capacities, catalytic properties, ATP/2e- ratio, and transmembrane potential. The respiratory-deficient mutant G137E and the three pseudo-wild type revertants E137 + I147F, E137 + C133S, and E137 + N256K were described previously (Tron and Lemesle-Meunier, 1990; Di Rago et al., 1990a). The mutant G137E is unable to grow on respiratory substrates but its electron transfer activity is partly conserved and totally inhibited by antimycin A. The secondary mutations restore the respiratory growth at variable degree, with a phosphorylation efficiency of 12-42% as regards the parental wild type strain, and result in a slight increase in the various electron transfer activities at the level of the whole respiratory chain. The catalytic efficiency for ubiquinol was slightly (G137E) or not affected (E137 + I147F, E137 + C133S, and E137 + N256K) in these mutants. Mutation G137E induces a decrease in the ATP/2e- ratio (50% of the W.T. value) and transmembrane potential (60% of the W.T. value) at the bc1 level, whereas the energetic capacity of the cytochrome oxidase is conserved. Secondary mutations I147F, C133S, and N256K partly restore the ATP/2e- ratio and the transmembrane potential at the bc1 complex level. The results suggest that a partial decoupling of the bc1 complex is induced by the cytochrome b point mutation G137E. In the framework of the protonmotive Q cycle, this decoupling can be explained by the existence of a proton wire connecting centers P and N in the wild type bc1 complex which may be amplified or uncovered by the G137E mutation when the bc1 complex is functioning.
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Affiliation(s)
- C Bruel
- Laboratoire de Bioénergétique et Ingénierie des Protéines, C.N.R.S., Marseille, France
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25
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Bruel C, di Rago JP, Slonimski PP, Lemesle-Meunier D. Role of the evolutionarily conserved cytochrome b tryptophan 142 in the ubiquinol oxidation catalyzed by the bc1 complex in the yeast Saccharomyces cerevisiae. J Biol Chem 1995; 270:22321-8. [PMID: 7673215 DOI: 10.1074/jbc.270.38.22321] [Citation(s) in RCA: 24] [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] [Indexed: 01/26/2023] Open
Abstract
Trp-142 is a highly conserved residue of the cytochrome b subunit in the bc1 complexes. To study the importance of this residue in the quinol oxidation catalyzed by the bc1 complex, we characterized four yeast mutants with arginine, lysine, threonine, and serine at position 142. The mutant W142R was isolated previously as a respiration-deficient mutant unable to grow on non-fermentable carbon sources (Lemesle-Meunier, D., Brivet-Chevillotte, P., di Rago, J.-P, Slonimski, P.P., Bruel, C., Tron, T., and Forget, N. (1993) J. Biol. Chem. 268, 15626-15632). The mutants W142K, W142T, and W142S were obtained here as respiration-sufficient revertants from mutant W142R. Mutant W142R exhibited a decreased complex II turnover both in the presence and absence of antimycin A; this suggests that the structural effect of W142R in the bc1 complex probably interferes with the correct assembly of the succinate-ubiquinone reductase complex. The mutations resulted in a parallel decrease in turnover number and apparent Km, with the result that there was no significant change in the second-order rate constant for ubiquinol oxidation. Mutants W142K and W142T exhibited some resistance toward myxothiazol, whereas mutant W142R showed increased sensitivity. The cytochrome cc1 reduction kinetics were found to be severely affected in mutants W142R, W142K, and W142T. The respiratory activities and the amounts of reduced cytochrome b measured during steady state suggest that the W142S mutation also modified the quinol-cytochrome c1 electron transfer pathway. The cytochrome b reduction kinetics through center P were affected when Trp-142 was replaced with arginine or lysine, but not when it was replaced with threonine or serine. Of the four amino acids tested at position 142, only arginine resulted in a decrease in cytochrome b reduction through center N. These findings are discussed in terms of the structure and function of the quinol oxidation site and seem to indicate that Trp-142 is not critical to the kinetic interaction of ubiquinol with the reductase, but plays an important role in the electron transfer reactions that intervene between ubiquinol oxidation and cytochrome c1 reduction.
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Affiliation(s)
- C Bruel
- Laboratoire de Bioénergétique et Ingénierie des Protéines, CNRS, Marseille, France
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Bruel C, Lemesle-Meunier D. Investigation of the structural interactions between the myxothiazol binding and the ubiquinol oxidation sites in the bc1 complex of S. cerevisiae. Biochem Soc Trans 1994; 22:61S. [PMID: 8206291 DOI: 10.1042/bst022061s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- C Bruel
- Unité de Métabolisme Energétique-L.C.B B.P n degrees 3, Marseille, France
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Lemesle-Meunier D, Brivet-Chevillotte P, di Rago JP, Slonimski PP, Bruel C, Tron T, Forget N. Cytochrome b-deficient mutants of the ubiquinol-cytochrome c oxidoreductase in Saccharomyces cerevisiae. Consequence for the functional and structural characteristics of the complex. J Biol Chem 1993; 268:15626-32. [PMID: 8393450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We characterized six novel missense mutations in mitochondrial cytochrome b (C133Y, W142R, S206L, M221K, L282F, and G340E) which impair the respiratory growth of yeast and which have differential effects on the functioning and assembly of the bc1 complex. The mutations have been mapped genetically in exons of the mitochondrial gene coding for apocytochrome b and their nucleotide sequence established. The mutants help to better define the topographical and primary sequence location of the ubiquinol oxidase (center P) and ubiquinone reductase (center N) sites on cytochrome b. Two mutants (C133Y and S206L) resulted in an active assembled complex, with selective disturbances of heme 565 and heme 562, respectively, which is consistent with the assignment of the axial ligands of these hemes; the C133Y mutation induced myxothiazol resistance, whereas the S206L did not modify the antimycin binding site, although perturbing the center N. These two amino acid replacements, along with those described elsewhere (Tron, T., and Lemesle-Meunier, D. (1990) Curr. Genet. 18, 413-419), constitute a novel class of mutants exhibiting appreciable electron transfer activity, despite their impaired ability to grow on respiratory substrates, raising the possibility that these mutants carry alleles which result in "decoupling" of proton translocation from electron transfer. Mutants W142R and M221K had an inactive but well assembled bc1 complex, whereas the G34OE and L282F mutations impaired the assembly of the bc1 complex.
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Lemesle-Meunier D, Brivet-Chevillotte P, di Rago J, Slonimski P, Bruel C, Tron T, Forget N. Cytochrome b-deficient mutants of the ubiquinol-cytochrome c oxidoreductase in Saccharomyces cerevisiae. Consequence for the functional and structural characteristics of the complex. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)82302-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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