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Kroemer N, Amann LF, Farooq A, Pfaffendorf C, Martens M, Decousser JW, Grégoire N, Nordmann P, Wicha SG. Pharmacokinetic/pharmacodynamic analysis of ceftazidime/avibactam and fosfomycin combinations in an in vitro hollow fiber infection model against multidrug-resistant Escherichia coli. Microbiol Spectr 2024; 12:e0331823. [PMID: 38063387 PMCID: PMC10783110 DOI: 10.1128/spectrum.03318-23] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 11/10/2023] [Indexed: 01/13/2024] Open
Abstract
IMPORTANCE Mechanistic understanding of pharmacodynamic interactions is key for the development of rational antibiotic combination therapies to increase efficacy and suppress the development of resistances. Potent tools to provide those insights into pharmacodynamic drug interactions are semi-mechanistic modeling and simulation techniques. This study uses those techniques to provide a detailed understanding with regard to the direction and strength of the synergy of ceftazidime-avibactam and ceftazidime-fosfomycin in a clinical Escherichia coli isolate expressing extended spectrum beta-lactamase (CTX-M-15 and TEM-4) and carbapenemase (OXA-244) genes. Enhanced killing effects in combination were identified as a driver of the synergy and were translated from static time-kill experiments into the dynamic hollow fiber infection model. These findings in combination with a suppression of the emergence of resistance in combination emphasize a potential clinical benefit with regard to increased efficacy or to allow for dose reductions with maintained effect sizes to avoid toxicity.
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Affiliation(s)
- Niklas Kroemer
- Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | - Lisa F. Amann
- Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | - Aneeq Farooq
- Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | | | - Miklas Martens
- Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | - Jean-Winoc Decousser
- Dynamic Team – EA 7380, Faculté de Santé, Université Paris-Est-Créteil Val-De-Marne, Créteil, France
| | - Nicolas Grégoire
- Inserm U1070, Poitiers, France
- UFR de Médecine Pharmacie, Université de Poitiers, Poitiers, France
- Laboratoire de Toxicologie-Pharmacologie, CHU de Poitiers, Poitiers, France
| | - Patrice Nordmann
- Medical and Molecular Microbiology, University of Fribourg, Fribourg, Switzerland
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Deroche L, Aranzana-Climent V, Rozenholc A, Prouvensier L, Darnaud L, Grégoire N, Marchand S, Ploy MC, François B, Couet W, Barraud O, Buyck JM. Characterization of Pseudomonas aeruginosa resistance to ceftolozane-tazobactam due to ampC and/or ampD mutations observed during treatment using semi-mechanistic PKPD modeling. Antimicrob Agents Chemother 2023; 67:e0048023. [PMID: 37695298 PMCID: PMC10583683 DOI: 10.1128/aac.00480-23] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 07/17/2023] [Indexed: 09/12/2023] Open
Abstract
A double ampC (AmpCG183D) and ampD (AmpDH157Y) genes mutations have been identified by whole genome sequencing in a Pseudomonas aeruginosa (PaS) that became resistant (PaR) in a patient treated by ceftolozane/tazobactam (C/T). To precisely characterize the respective contributions of these mutations on the decreased susceptibility to C/T and on the parallel increased susceptibility to imipenem (IMI), mutants were generated by homologous recombination in PAO1 reference strain (PAO1- AmpCG183D, PAO1-AmpDH157Y, PAO1-AmpCG183D/AmpDH157Y) and in PaR (PaR-AmpCPaS/AmpDPaS). Sequential time-kill curve experiments were conducted on all strains and analyzed by semi-mechanistic PKPD modeling. A PKPD model with adaptation successfully described the data, allowing discrimination between initial and time-related (adaptive resistance) effects of mutations. With PAO1 and mutant-derived strains, initial EC50 values increased by 1.4, 4.1, and 29-fold after AmpCG183D , AmpDH157Y and AmpCG183D/AmpDH157Y mutations, respectively. EC50 values were increased by 320, 12.4, and 55-fold at the end of the 2 nd experiment. EC50 of PAO1-AmpCG183D/AmpDH157Y was higher than that of single mutants at any time of the experiments. Within the PaR clinical background, reversal of AmpCG183D, and AmpDH157Y mutations led to an important decrease of EC50 value, from 80.5 mg/L to 6.77 mg/L for PaR and PaR-AmpCPaS/AmpDPaS, respectively. The effect of mutations on IMI susceptibility mainly showed that the AmpCG183D mutation prevented the emergence of adaptive resistance. The model successfully described the separate and combined effect of AmpCG183D and AmpDH157Y mutations against C/T and IMI, allowing discrimination and quantification of the initial and time-related effects of mutations. This method could be reproduced in clinical strains to decipher complex resistance mechanisms.
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Affiliation(s)
- Luc Deroche
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- CHU de Poitiers, Département des agents infectieux, Poitiers, France
- Université de Limoges, Inserm U1092, Limoges, France
| | | | | | - Laure Prouvensier
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- CHU de Poitiers, Laboratoire de Toxicologie et de Pharmacocinétique, Poitiers, France
| | - Léa Darnaud
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
| | - Nicolas Grégoire
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- CHU de Poitiers, Laboratoire de Toxicologie et de Pharmacocinétique, Poitiers, France
| | - Sandrine Marchand
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- CHU de Poitiers, Laboratoire de Toxicologie et de Pharmacocinétique, Poitiers, France
| | - Marie-Cécile Ploy
- Université de Limoges, Inserm U1092, Limoges, France
- CHU de Limoges, Laboratoire de Bactériologie-Virologie-Hygiène, Limoges, France
| | - Bruno François
- Université de Limoges, Inserm U1092, Limoges, France
- CHU Limoges, Service de Réanimation Polyvalente, Limoges, France
- Inserm CIC 1435, CHU Limoges, Limoges, France
| | - William Couet
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- CHU de Poitiers, Laboratoire de Toxicologie et de Pharmacocinétique, Poitiers, France
| | - Olivier Barraud
- Université de Limoges, Inserm U1092, Limoges, France
- CHU de Limoges, Laboratoire de Bactériologie-Virologie-Hygiène, Limoges, France
- Inserm CIC 1435, CHU Limoges, Limoges, France
| | - Julien M. Buyck
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
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Aubry R, Buyck J, Prouvensier L, Decousser JW, Nordmann P, Wicha SG, Marchand S, Grégoire N. An improved PKPD modeling approach to characterize the pharmacodynamic interaction over time between ceftazidime/avibactam and colistin from in vitro time-kill experiments against multidrug-resistant Klebsiella pneumoniae isolates. Antimicrob Agents Chemother 2023; 67:e0030123. [PMID: 37681977 PMCID: PMC10583682 DOI: 10.1128/aac.00301-23] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 07/18/2023] [Indexed: 09/09/2023] Open
Abstract
In contrast to the checkerboard method, bactericidal experiments [time-kill curves (TKCs)] allow an assessment of pharmacodynamic (PD) interactions over time. However, TKCs in combination pose interpretation problems. The objective of this study was to characterize the PD interaction over time between ceftazidime/avibactam (CZA) and colistin (CST) using TKC against four multidrug-resistant Klebsiella pneumoniae susceptible to both antibiotics and expressing a widespread carbapenemase determinant KPC-3. In vitro TKCs were performed and analyzed using pharmacokinetic/pharmacodynamic (PKPD) modeling. The general pharmacodynamic interaction model was used to characterize PD interactions between drugs. The 95% confidence intervals (95%CIs) of the expected additivity and of the observed interaction were built using parametric bootstraps and compared to evaluate the in vitro PD interaction over time. Further simulations were conducted to investigate the effect of the combination at varying concentrations typically observed in patients. Regrowth was observed in TKCs at high concentrations of drugs alone [from 4 to 32× minimum inhibitory concentrations (MIC)], while the combination systematically prevented the regrowth at concentrations close to the MIC. Significant synergy or antagonism were observed under specific conditions but overall 95%CIs overlapped widely over time indicating an additive interaction between antibiotics. Moreover, simulations of typical PK profile at standard dosages indicated that the interaction should be additive in clinical conditions. The nature of the PD interaction varied with time and concentration in TKC. Against the four K. pneumoniae isolates, the bactericidal effect of CZA + CST combination was predicted to be additive and to prevent the emergence of resistance at clinical concentrations.
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Affiliation(s)
- Romain Aubry
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
| | - Julien Buyck
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
| | - Laure Prouvensier
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- Laboratoire de Toxicologie-Pharmacologie, CHU de Poitiers, Poitiers, France
| | - Jean-Winoc Decousser
- Department of Bacteriology and Infection Control, University Hospital Henri Mondor, Assistance Publique - Hôpitaux de Paris, Créteil, France
- Faculté de Médecine de Créteil, Ecole nationale vétérinaire d'Alfort (EnvA), EA 7380 Dynamyc Université Paris - Est Créteil (UPEC), Créteil, France
| | - Patrice Nordmann
- Medical and Molecular Microbiology Unit, Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
- Swiss National Reference Center for Emerging Antibiotic Resistance (NARA), University of Fribourg, Fribourg, Switzerland
- Institute for Microbiology, University of Lausanne and University Hospital Centre, Lausanne, Switzerland
| | - Sebastian G. Wicha
- Department of Clinical Pharmacy, Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | - Sandrine Marchand
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- Laboratoire de Toxicologie-Pharmacologie, CHU de Poitiers, Poitiers, France
| | - Nicolas Grégoire
- Université de Poitiers, PHAR2, Inserm U1070, Poitiers, France
- Laboratoire de Toxicologie-Pharmacologie, CHU de Poitiers, Poitiers, France
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Kroemer N, Martens M, Decousser JW, Grégoire N, Nordmann P, Wicha SG. Evaluation of in vitro pharmacodynamic drug interactions of ceftazidime/avibactam and fosfomycin in Escherichia coli. J Antimicrob Chemother 2023; 78:2524-2534. [PMID: 37624929 DOI: 10.1093/jac/dkad264] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 07/31/2023] [Indexed: 08/27/2023] Open
Abstract
BACKGROUND Combination therapy can increase efficacy of antibiotics and prevent emergence of resistance. Ceftazidime/avibactam and fosfomycin may be empirically combined for this purpose, but a systematic and quantitative evaluation of this combination is needed. OBJECTIVES In this study, a systematic analysis of the pharmacodynamic interactions of ceftazidime/avibactam and fosfomycin in clinical and isogenic Escherichia coli strains carrying genes coding for several carbapenemases or ESBLs was performed and pharmacodynamic interactions were quantified by modelling and simulations. METHODS Pharmacodynamic interactions were evaluated in 'dynamic' chequerboard experiments with quantification of viable bacteria in eight isogenic and six clinical E. coli strains. Additionally, supplemental time-kill experiments were performed and genomic analyses were conducted on representative fosfomycin-resistant subpopulations. Models were fitted to all data using R and NONMEM®. RESULTS Synergistic drug interactions were identified for 67% of the clinical and 75% of the isogenic isolates with a mean EC50 reduction of >50%. Time-kill experiments confirmed the interactions and modelling quantified EC50 reductions up to 97% in combination and synergy prevented regrowth of bacteria by enhanced killing effects. In 9 out of 12 fosfomycin-resistant mutants, genomic analyses identified previously reported mutations. CONCLUSIONS The broad synergistic in vitro activity of ceftazidime/avibactam and fosfomycin confirms the potential of the application of this drug combination in clinics. The substantial reduction of the EC50 in combination may allow use of lower doses or treatment of organisms with higher MIC values and encourage further research translating these findings into the clinical setting.
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Affiliation(s)
- Niklas Kroemer
- Department of Clinical Pharmacy, Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | - Miklas Martens
- Department of Clinical Pharmacy, Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | - Jean-Winoc Decousser
- Dynamic Team-EA 7380, Faculté de santé, Université Paris-Est-Créteil Val-De-Marne, Créteil, France
| | - Nicolas Grégoire
- Inserm U1070, Pharmacologie des Anti-infectieux et Antibiorésistance, Poitiers, France
- Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France
- CHU de Poitiers, Laboratoire de Toxicologie-Pharmacologie, Poitiers, France
| | - Patrice Nordmann
- Medical and Molecular Microbiology, University of Fribourg, Fribourg, Switzerland
| | - Sebastian G Wicha
- Department of Clinical Pharmacy, Institute of Pharmacy, University of Hamburg, Hamburg, Germany
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Fuertes V, Grégoire N, Labranche P, Gagnon S, LaRochelle S, Messaddeq Y. Towards REPO 4 nanocrystal-doped optical fibers for distributed sensing applications. Sci Rep 2023; 13:12891. [PMID: 37558741 PMCID: PMC10412647 DOI: 10.1038/s41598-023-40161-1] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 08/05/2023] [Indexed: 08/11/2023] Open
Abstract
Rayleigh scattering enhanced nanoparticle-doped optical fibers, for distributed sensing applications, is a new technology that offers unique advantages to optical fiber community. However, the existing fabrication technology, based on in situ grown alkaline earth nanoparticles, is restricted to few compositions and exhibit a great dependence on many experimental conditions. Moreover, there is still several uncertainties about the effect of drawing process on the nanoparticle characteristics and its influence on the scattering enhancement and the induced optical loss. In this work, we shed light on all these issues that prevent the progress in the field and demonstrate the suitability of doping optical fibers with YPO4 nanocrystals for developing tunable Rayleigh scattering enhanced nanoparticle-doped optical fibers. An exhaustive 3D microstructural study reveals that their features are closely linked to the fiber drawing process, which allow the size and shape engineering at the nanoscale. In particular, the YPO4 nanocrystals preserve their features to a large extent when the optical fibers are drawn below 1950 °C, which allows obtaining homogeneous nanocrystal features and optical performance. Fabricated fibers exhibit a tunable enhanced backscattering in the range of 15.3-54.3 dB, with respect to a SMF-28 fiber, and two-way optical losses in the range 0.3-160.7 dB/m, revealed by Optical Backscatter Reflectometry (OBR) measurements. This allows sensing lengths from 0.3 m up to more than 58 m. The present work suggests a bright future of YPO4 nanocrystals for distributed sensing field and open a new gate towards the incorporation of other rare-earth orthophosphate (REPO4) nanocrystals with pre-defined characteristics that will overcome the limitations of the current in situ grown alkaline earth-based technology.
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Affiliation(s)
- V Fuertes
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada.
| | - N Grégoire
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada
| | - P Labranche
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada
| | - S Gagnon
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada
| | - S LaRochelle
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada
| | - Y Messaddeq
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada
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Fuertes V, Campo AD, Grégoire N, Labranche P, Fernández JF, Messaddeq Y. Unveiling Structural Insights into Nanocrystal-Doped Optical Fibers via Confocal Raman Microscopy. ACS Appl Mater Interfaces 2023. [PMID: 37482898 DOI: 10.1021/acsami.3c07512] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
An in-depth characterization of nanoparticle-doped optical fibers is crucial to understand the potential new functionalities of the engineered glass and thus their applicability fields. The high temperatures of the manufacturing process strongly affect the nanoparticle features, and therefore, their analysis is necessary after fiber drawing. However, the difficulties associated with the use of atomic resolution microscopies to analyze the nanoparticle features in the fiber core, mainly related to sample preparation and expensive costs, usually prevent their study. In this work, we overcome some of those limitations and demonstrate, for the first time, the suitability of structurally and microstructurally studying in detail nanocrystals contained in a fiber core of ∼10 μm by combining confocal Raman microscopy, Rayleigh light-scattering microscopy, and scanning electron microscopy (SEM). A thorough study of cubic-shaped and rod-shaped YPO4 nanocrystals contained in optical fibers reveals their crystallization in tetragonal (t) and monoclinic (m) structures, respectively. The symmetric (ν1) and asymmetric stretching (ν3) Raman modes display a different and remarkable red shift as particle size decreases in both types of nanocrystals, which in the case of the cubic-shaped nanocrystals is fitted to an exponential function along with a Raman peak broadening. Moreover, their Raman dependence vs temperature is evaluated up to 600 °C, observing a phonon softening that follows a linear behavior, which is discussed in detail. These findings add new insights to pure m-YPO4, which was unknown to date, and the REPO4 family and open up new avenues that can be extrapolated to other nanostructures incorporated into optical fiber cores, which will advance progress in the field of nanoparticle-doped optical fibers.
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Affiliation(s)
- Victor Fuertes
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC G1 V 0A6, Canada
| | - Adolfo Del Campo
- Department Electrocerámica, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain
| | - Nicolas Grégoire
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC G1 V 0A6, Canada
| | - Philippe Labranche
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC G1 V 0A6, Canada
| | | | - Younes Messaddeq
- Centre d'optique, Photonique et Laser, Université Laval, 2375 Rue de la Terrasse, Québec, QC G1 V 0A6, Canada
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Oualha M, Tournier N, Préau S, Grégoire N, Voiriot G, Pierre A, Joffre J, Gaudet A, Jouan Y, Kallel H, Radermacher P, Sarton B, Stiel L, Bréchot N, Lemaitre F, Vodovar D, CRT DLSRLF, SFPT P. Pharmaco-toxico : a very bad trip ? Méd Intensive Réa 2022. [DOI: 10.37051/mir-00125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
La septième édition du séminaire annuel de la Commission de la Recherche Translationnelle de la SRLF a permis un nouveau moment d’échange unique entre chercheurs et cliniciens autour des dernières données issues de la recherche translationnelle en pharmaco-toxicologie.
Les études pharmacologiques et toxicologiques, chez les patients en situation critique, se sont longtemps résumées à des mesures de concentrations plasmatiques. Leur interprétation clinique étaient souvent limitées par les méthodes de dosage elles-mêmes, mais aussi par les différents mécanismes conduisant à une variation individuelle de l’absorption, de la distribution, du métabolisme ou de l’élimination des médicaments ou du toxique. Les évolutions récentes des méthodes de dosage, la meilleure compréhension des mécanismes de diffusion et de clairance des médicaments/toxiques dans les tissus ainsi que l’utilisation de techniques innovantes basées sur l’imagerie pharmacologique et les modélisations pharmacocinétiques, permettent une meilleure interprétation des dosages mais aussi de prédire des échecs ou la survenue d’une toxicité en lien avec un médicament ou un toxique.
Les actes du séminaire ont été rédigés par les membres de la Commission de la Recherche Translationnelle de la SRLF et validés par les orateurs.
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Celaschi S, Grégoire N, Messaddeq Y, Biazoli CR, Malheiros-Silveira GN. Coaxial Mach-Zehnder Digital Strain Sensor Made from a Tapered Depressed Cladding Fiber. Sensors (Basel) 2022; 22:7145. [PMID: 36236244 PMCID: PMC9572830 DOI: 10.3390/s22197145] [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] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/29/2022] [Accepted: 08/03/2022] [Indexed: 06/16/2023]
Abstract
An in-line digital optical sensor was proposed. It was built from a tapered depressed-cladding single-mode fiber and modeled as a coaxial Mach-Zehnder interferometer. The principle of operation of the optical digital sensor is based on the computation of the number of optical power transfer turning points (PTTP) from the transmission data of the component. Biconic tapers with high values of PTTP, high spectral resolution, high extinction ratio, and low insertion loss were modeled, fabricated, and characterized. As a proof of concept, an in-line digital strain sensor was fabricated and characterized. It presents a free spectral range of 1.3 nm, and produced 96 PTTP, at λ0 = 1.55 μm, under stretch of ΔL = 707 µm, therefore producing a digital resolution of 7.4 µm/PTTP. The sensor also produced a quasi-symmetric response to stretch and compression.
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Affiliation(s)
- Sergio Celaschi
- Centro de Tecnologia da Informação Renato Archer, Campinas 13069-901, Brazil
| | - Nicolas Grégoire
- Centre d’Optique, Photonique et Laser, Université Laval, Quebec City, QC G1V 0A6, Canada
| | - Younès Messaddeq
- Centre d’Optique, Photonique et Laser, Université Laval, Quebec City, QC G1V 0A6, Canada
| | | | - Gilliard N. Malheiros-Silveira
- Department of Communications, School of Electrical and Computer Engineering, University of Campinas (UNICAMP), Campinas 13083-852, Brazil
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9
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Kroemer N, Aubry R, Couet W, Grégoire N, Wicha SG. Optimized Rhombic Experimental Dynamic Checkerboard Designs to Elucidate Pharmacodynamic Drug Interactions of Antibiotics. Pharm Res 2022; 39:3267-3277. [PMID: 36163408 PMCID: PMC9780134 DOI: 10.1007/s11095-022-03396-7] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 09/09/2022] [Indexed: 12/27/2022]
Abstract
PURPOSE Quantification of pharmacodynamic interactions is key in combination therapies, yet conventional checkerboard experiments with up to 10 by 10 combinations are labor-intensive. Therefore, this study provides optimized experimental rhombic checkerboard designs to enable an efficient interaction screening with significantly reduced experimental workload. METHODS Based on the general pharmacodynamic interaction (GPDI) model implemented in Bliss Independence, a novel rhombic 'dynamic' checkerboard design with quantification of bacteria instead of turbidity as endpoint was developed. In stochastic simulations and estimations (SSE), the precision and accuracy of interaction parameter estimations and classification rates of conventional reference designs and the newly proposed rhombic designs based on effective concentrations (EC) were compared. RESULTS Although a conventional rich design with 20-times as many combination scenarios provided estimates of interaction parameters with higher accuracy, precision and classification rates, the optimized rhombic designs with one natural growth scenario, three monotherapy scenarios per combination partner and only four combination scenarios were still superior to conventional reduced designs with twice as many combination scenarios. Additionally, the rhombic designs were able to identify whether an interaction occurred as a shift on maximum effect or EC50 with > 98%. Overall, effective concentration-based designs were found to be superior to traditional standard concentrations, but were more challenged by strong interaction sizes exceeding their adaptive concentration ranges. CONCLUSION The rhombic designs proposed in this study enable a reduction of resources and labor and can be a tool to streamline higher throughput in drug interaction screening.
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Affiliation(s)
- Niklas Kroemer
- Department of Clinical Pharmacy, Institute of Pharmacy, University of Hamburg, Hamburg, Germany
| | - Romain Aubry
- Inserm U1070, Poitiers, France ,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France
| | - William Couet
- Inserm U1070, Poitiers, France ,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France ,CHU de Poitiers, Laboratoire de Toxicologie-Pharmacologie, Poitiers, France
| | - Nicolas Grégoire
- Inserm U1070, Poitiers, France ,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France ,CHU de Poitiers, Laboratoire de Toxicologie-Pharmacologie, Poitiers, France
| | - Sebastian G. Wicha
- Department of Clinical Pharmacy, Institute of Pharmacy, University of Hamburg, Hamburg, Germany
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10
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Valcourt C, Buyck JM, Grégoire N, Couet W, Marchand S, Tewes F. Lipid Nanoparticles Loaded with Farnesol or Geraniol to Enhance the Susceptibility of E. coli MCR-1 to Colistin. Pharmaceutics 2021; 13:pharmaceutics13111849. [PMID: 34834268 PMCID: PMC8625850 DOI: 10.3390/pharmaceutics13111849] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/11/2021] [Accepted: 10/12/2021] [Indexed: 11/24/2022] Open
Abstract
Resistance to colistin, one of the antibiotics of last resort against multidrug-resistant Gram-negative bacteria, is increasingly reported. Notably, MCR plasmids discovered in 2015 have now been reported worldwide in humans. To keep this antibiotic of last resort efficient, a way to tackle this mechanism seems essential. Terpene alcohols such as farnesol have been shown to improve the efficacy of some antibiotics. However, their high lipophilicity makes them difficult to use. This problem can be solved by encapsulating them in water-dispersible lipid nanoparticles (LNPs). The aim of this study was to discover, using checkerboard tests and time-kill curve experiments, an association between colistin and farnesol or geraniol loaded in LNPs, which would improve the efficacy of colistin against E. coli and, in particular, MCR-1 transconjugants. Then, the effect of the combination on E. coli inner membrane permeabilisation was evaluated using propidium iodide (PI) uptake and compared to human red blood cells plasma membrane permeabilisation. Both terpene alcohols were able to restore the susceptibility of E. coli J53 MCR-1 to colistin with the same efficacy (Emax = 16, i.e., colistin MIC was decreased from 8 to 0.5 mg/L). However, with an EC50 of 2.69 mg/L, farnesol was more potent than geraniol (EC50 = 39.49 mg/L). Time-kill studies showed a bactericidal effect on MCR-1 transconjugant 6 h after incubation, with no regrowth up to 30 h in the presence of 1 mg/L colistin (1/8 MIC) and 60 mg/L or 200 mg/L farnesol or geraniol, respectively. Colistin alone was more potent in increasing PI uptake rate in the susceptible strain (EC50 = 0.86 ± 0.08 mg/L) than in the MCR-1 one (EC50 = 7.38 ± 0.85 mg/L). Against the MCR-1 strain, farnesol-loaded LNP at 60 mg/L enhanced the colistin-induced inner membrane permeabilization effect up to 5-fold and also increased its potency as shown by the decrease in its EC50 from 7.38 ± 0.85 mg/L to 2.69 ± 0.25 mg/L. Importantly, no hemolysis was observed for LNPs loaded with farnesol or geraniol, alone or in combination with colistin, at the concentrations showing the maximum decrease in colistin MICs. The results presented here indicate that farnesol-loaded LNPs should be studied as combination therapy with colistin to prevent the development of resistance to this antibiotic of last resort.
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Affiliation(s)
- Chantal Valcourt
- INSERM U1070 “Pharmacology of Anti-Infective Agents”, 1 rue Georges Bonnet, Pôle Biologie Santé, 86022 Poitiers, France; (C.V.); (J.M.B.); (N.G.); (W.C.); (S.M.)
| | - Julien M. Buyck
- INSERM U1070 “Pharmacology of Anti-Infective Agents”, 1 rue Georges Bonnet, Pôle Biologie Santé, 86022 Poitiers, France; (C.V.); (J.M.B.); (N.G.); (W.C.); (S.M.)
- UFR Médecine-Pharmacie Université de Poitiers, 6 rue de la Milétrie, TSA 51115, 86073 Poitiers, France
| | - Nicolas Grégoire
- INSERM U1070 “Pharmacology of Anti-Infective Agents”, 1 rue Georges Bonnet, Pôle Biologie Santé, 86022 Poitiers, France; (C.V.); (J.M.B.); (N.G.); (W.C.); (S.M.)
- UFR Médecine-Pharmacie Université de Poitiers, 6 rue de la Milétrie, TSA 51115, 86073 Poitiers, France
- Laboratoire de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la Miletrie, 86021 Poitiers, France
| | - William Couet
- INSERM U1070 “Pharmacology of Anti-Infective Agents”, 1 rue Georges Bonnet, Pôle Biologie Santé, 86022 Poitiers, France; (C.V.); (J.M.B.); (N.G.); (W.C.); (S.M.)
- UFR Médecine-Pharmacie Université de Poitiers, 6 rue de la Milétrie, TSA 51115, 86073 Poitiers, France
- Laboratoire de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la Miletrie, 86021 Poitiers, France
| | - Sandrine Marchand
- INSERM U1070 “Pharmacology of Anti-Infective Agents”, 1 rue Georges Bonnet, Pôle Biologie Santé, 86022 Poitiers, France; (C.V.); (J.M.B.); (N.G.); (W.C.); (S.M.)
- UFR Médecine-Pharmacie Université de Poitiers, 6 rue de la Milétrie, TSA 51115, 86073 Poitiers, France
- Laboratoire de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la Miletrie, 86021 Poitiers, France
| | - Frédéric Tewes
- INSERM U1070 “Pharmacology of Anti-Infective Agents”, 1 rue Georges Bonnet, Pôle Biologie Santé, 86022 Poitiers, France; (C.V.); (J.M.B.); (N.G.); (W.C.); (S.M.)
- UFR Médecine-Pharmacie Université de Poitiers, 6 rue de la Milétrie, TSA 51115, 86073 Poitiers, France
- Correspondence:
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11
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Steenhaut T, Fusaro L, Robeyns K, Lacour S, Li X, Mahy JG, Louppe V, Grégoire N, Barozzino-Consiglio G, Statsyns JF, Aprile C, Filinchuk Y, Hermans S. Functionalization of Mono- and Bimetallic MIL-100(Al,Fe) MOFs by Ethylenediamine: Postfunctionalization, Brønsted Acido-Basicity, and Unusual CO 2 Sorption Behavior. Inorg Chem 2021; 60:16666-16677. [PMID: 34652917 DOI: 10.1021/acs.inorgchem.1c02568] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The metal sites of MIL-100(Fe), MIL-100(Fe,Al), and MIL-100(Al) metal-organic frameworks (MOFs) were decorated with ethylenediamine (EN). Interestingly, the Al-containing MOFs presented hierarchized porosity, and their structural integrity was maintained upon functionalization. Solution and solid-state NMR confirmed the grafting efficiency in the case of MIL-100(Al) and the presence of a free amine group. It was shown that MIL-100(Al) can be functionalized by only one EN molecule in each trimeric Al3O cluster unit, whereas the other two aluminum sites are occupied by a hydroxyl and a water molecule. The -NH2 sites of the grafted ethylenediamine can be used for further postfunctionalization through amine chemistry and are responsible for the basicity of the functionalized material as well as increased affinity for CO2. Furthermore, the presence of coordinated water molecules on the Al-MOF is responsible for simultaneous Brønsted acidity. Finally, the Al-containing MOFs show an unusual carbon dioxide sorption mechanism at high pressures that distinguishes those materials from their iron and chromium counterparts and is suspected to be due to the presence of polarized Al-OH bonds.
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Affiliation(s)
- Timothy Steenhaut
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Luca Fusaro
- Namur Institute of Structured Matter (NISM), UNamur, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Koen Robeyns
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Séraphin Lacour
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Xiao Li
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Julien G Mahy
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Véronique Louppe
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Nicolas Grégoire
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Gabriella Barozzino-Consiglio
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Jean-François Statsyns
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Carmela Aprile
- Namur Institute of Structured Matter (NISM), UNamur, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Yaroslav Filinchuk
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
| | - Sophie Hermans
- Institute of Condensed Matter and Nanosciences (IMCN), UCLouvain, Place Louis Pasteur 1/L4.01.03, 1348 Louvain-la-Neuve, Belgium
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12
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Michaud LC, Veilleux C, Bilodeau G, Gilbert-Paquet O, Lebel-Cormier MA, Lemieux-Tanguay M, Pelletier-Ouellet S, Paradis P, Bellec M, Grégoire N, Morency S, Messaddeq Y, Bernier M. 100-W-level single-mode ytterbium-free erbium fiber laser. Opt Lett 2021; 46:2553-2556. [PMID: 33988633 DOI: 10.1364/ol.427291] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
We report on an ytterbium-free, erbium-doped single-mode all-fiber laser reaching a record output power of 107 W at 1598 nm, with a slope efficiency of 38.6% according to the absorbed pump power at 981 nm. The erbium-doped gain fiber, co-doped with cerium, aluminum, and phosphorus, was fabricated in-house with adjusted doping concentrations to reduce erbium ions clustering, thereby increasing efficiency while keeping the numerical aperture low to ensure a single-mode laser operation. The addition of cerium co-dopant in the core glass of an erbium system is used for the first time, to the best of our knowledge, in order to adjust the fiber's numerical aperture without increasing the erbium concentration. Numerical modeling, validated by the experimental results, demonstrates that adding aluminum and phosphorus at high concentration mitigates erbium ions clustering, with an estimated erbium paired ions of only 5.0% in the reported gain fiber.
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13
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Quémener M, Grégoire N, Morency S, Côté D, Thibault S. MCVD-based GRIN-axicon for the generation of scalable Bessel-Gauss beams. Opt Lett 2021; 46:1333-1336. [PMID: 33720180 DOI: 10.1364/ol.415773] [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] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
In this Letter, we introduce a graded-index (GRIN)-lens combination named GRIN-axicon, which is a versatile component capable of generating high-quality scalable Bessel-Gauss beams. To the best of our knowledge, the GRIN-axicon is the only optical component that can be introduced in both larger-scale laboratory setups and miniaturized all-fiber optical setups, while having an easy control of the dimensioning of the generated focal line. We show that a GRIN lens with a hyperbolic secant refractive index profile with a sharp central dip and no ripples generates a Bessel-Gauss beam with a high-intensity central lobe when coupled to a simple lens. Such fabrication characteristics are very suitable for the modified chemical vapor deposition (MCVD) process and enable easy manufacturing of an adaptable component that can fit in any optical setup.
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14
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Magréault S, Mankikian J, Marchand S, Diot P, Couet W, Flament T, Grégoire N. Pharmacokinetics of colistin after nebulization or intravenous administration of colistin methanesulphonate (Colimycin®) to cystic fibrosis patients. J Cyst Fibros 2020; 19:421-426. [DOI: 10.1016/j.jcf.2019.08.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 07/12/2019] [Accepted: 08/23/2019] [Indexed: 12/31/2022]
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15
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Lord MP, Talbot L, Boily O, Boilard T, Gariépy G, Grelet S, Paradis P, Boulanger V, Grégoire N, Morency S, Messaddeq Y, Bernier M. Erbium-doped aluminophosphosilicate all-fiber laser operating at 1584 nm. Opt Express 2020; 28:3378-3387. [PMID: 32122007 DOI: 10.1364/oe.379574] [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] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 01/15/2020] [Indexed: 06/10/2023]
Abstract
We report on an ytterbium-free erbium-doped aluminophosphosilicate all-fiber laser, producing an output power of 25 W at a wavelength of 1584 nm with a slope efficiency of 30% with respect to the 976 nm absorbed pump power. The simple cavity design proposed takes advantage of fiber Bragg gratings written directly in the gain fiber. The single-mode erbium-doped aluminophosphosilicate fiber was fabricated in-house and was doped with 0.06 mol.% of Er2O3, 1.77 mol.% of Al2O3 and 1.04 mol.% of P2O5. The incorporation of aluminium and phosphorus into the fiber core allowed for an increased concentration of erbium without inducing significant clustering, while keeping the numerical aperture low to ensure a single-mode laser operation.
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16
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Grégoire N, Marchand S, Ferrandière M, Lasocki S, Seguin P, Vourc'h M, Barbaz M, Gaillard T, Launey Y, Asehnoune K, Couet W, Mimoz O. Population pharmacokinetics of daptomycin in critically ill patients with various degrees of renal impairment. J Antimicrob Chemother 2020; 74:117-125. [PMID: 30295740 DOI: 10.1093/jac/dky374] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 08/20/2018] [Indexed: 11/13/2022] Open
Abstract
Objectives The objective of this study was to characterize the pharmacokinetics of unbound and total concentrations of daptomycin in infected ICU patients with various degrees of renal impairment. From these results, the probability of attaining antimicrobial efficacy and the risks of toxicity were assessed. Methods Twenty-four ICU patients with various renal functions and requiring treatment of complicated skin and soft-tissue infections, bacteraemia, or endocarditis with daptomycin were recruited. Daptomycin (Cubicin®) at 10 mg/kg was administered every 24 h for patients with creatinine clearance (CLCR) ≥30 mL/min and every 48 h for patients with CLCR <30 mL/min. Total and unbound plasma concentrations and urine concentrations of daptomycin were analysed simultaneously following a population pharmacokinetic approach. Simulations were conducted to estimate the probability of attaining efficacy (unbound AUCu/MIC >40 or >80) or toxicity (Cmin >24.3 mg/L) targets. Results Exposure to unbound daptomycin increased when the renal function decreased, thus increasing the probability of reaching the efficacy targets, but also the risk of toxicity. Modifications of the unbound fraction (fu) of daptomycin did not affect the pharmacokinetics of unbound daptomycin, but did affect the pharmacokinetics of total daptomycin. Conclusions Daptomycin at 10 mg/kg q24h allowed efficacy pharmacokinetic/pharmacodynamic targets for ICU patients with CLCR ≥30 mL/min to be reached. For patients with CLCR <30 mL/min, halving the rate of drug administration, i.e. 10 mg/kg q48h, was sufficient to reach these targets. No adverse events were observed, but the toxicity of the 10 mg/kg q24h dosing regimen should be further assessed, particularly for patients with altered renal function.
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Affiliation(s)
- Nicolas Grégoire
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
| | - Sandrine Marchand
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France.,CHU de Poitiers, Service de Toxicologie-Pharmacocinétique, 2 rue de la milétrie, Poitiers, France
| | - Martine Ferrandière
- CHU de Tours, Service d'anesthésie et réanimation, 2 boulevard Tonnellé, Tours cedex 9, France
| | - Sigismond Lasocki
- CHU d'Angers, Service d'anesthésie et réanimation, 4 rue Larrey, Angers, France
| | - Philippe Seguin
- CHU de Rennes, Service de réanimation chirurgicale, 2 rue Henri Le Guilloux, Rennes, France
| | - Mickaël Vourc'h
- CHU de Nantes, Service d'anesthésie et réanimation, Hôtel Dieu, 1 Place Alexis-Ricordeau, Nantes, France
| | - Mathilde Barbaz
- CHU de Tours, Service d'anesthésie et réanimation, 2 boulevard Tonnellé, Tours cedex 9, France
| | - Thomas Gaillard
- CHU d'Angers, Service d'anesthésie et réanimation, 4 rue Larrey, Angers, France
| | - Yoann Launey
- CHU de Rennes, Service de réanimation chirurgicale, 2 rue Henri Le Guilloux, Rennes, France
| | - Karim Asehnoune
- CHU de Nantes, Service d'anesthésie et réanimation, Hôtel Dieu, 1 Place Alexis-Ricordeau, Nantes, France
| | - William Couet
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France.,CHU de Poitiers, Service de Toxicologie-Pharmacocinétique, 2 rue de la milétrie, Poitiers, France
| | - Olivier Mimoz
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France.,CHU de Poitiers, Service des Urgences - SAMU 86 - SMUR, 2 rue de la milétrie, Poitiers, France
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17
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Steenhaut T, Grégoire N, Barozzino-Consiglio G, Filinchuk Y, Hermans S. Mechanochemical defect engineering of HKUST-1 and impact of the resulting defects on carbon dioxide sorption and catalytic cyclopropanation. RSC Adv 2020; 10:19822-19831. [PMID: 35520409 PMCID: PMC9054116 DOI: 10.1039/c9ra10412g] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 12/11/2019] [Accepted: 05/06/2020] [Indexed: 11/21/2022] Open
Abstract
Metal–organic frameworks (MOFs) are recognized as ideal candidates for many applications such as gas sorption and catalysis. For a long time the properties of these materials were thought to essentially arise from their well-defined crystal structures. It is only recently that the importance of structural defects for the properties of MOFs has been evidenced. In this work, salt-assisted and liquid-assisted grinding were used to introduce defects in a copper-based MOF, namely HKUST-1. Different milling times and post-synthetic treatments with alcohols allow introduction of defects in the form of free carboxylic acid groups or reduced copper(i) sites. The nature and the amount of defects were evaluated by spectroscopic methods (FTIR, XPS) as well as TGA and NH3 temperature-programmed desorption experiments. The negative impact of free –COOH groups on the catalytic cyclopropanation reaction of ethyl diazoacetate with styrene, as well as on the gravimetric CO2 sorption capacities of the materials, was demonstrated. The improvement of the catalytic activity of carboxylic acid containing materials by the presence of CuI sites was also evidenced. Defective HKUST-1 was prepared by salt- or liquid-assisted grinding with post-synthetic treatments with alcohols. The defects identified as free carboxylic acid groups or reduced Cu(i) sites influence strongly gas storage and catalytic properties.![]()
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Affiliation(s)
| | - Nicolas Grégoire
- Université catholique de Louvain
- IMCN
- 1348 Louvain-la-Neuve
- Belgium
| | | | | | - Sophie Hermans
- Université catholique de Louvain
- IMCN
- 1348 Louvain-la-Neuve
- Belgium
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18
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Fantin B, Poujade J, Grégoire N, Chau F, Roujansky A, Kieffer N, Berleur M, Couet W, Nordmann P. The inoculum effect of Escherichia coli expressing mcr-1 or not on colistin activity in a murine model of peritonitis. Clin Microbiol Infect 2019; 25:1563.e5-1563.e8. [PMID: 31494253 DOI: 10.1016/j.cmi.2019.08.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 08/05/2019] [Accepted: 08/27/2019] [Indexed: 01/06/2023]
Abstract
OBJECTIVES Colistin often remains the last resort antibiotic active against carbapenemase-producing Enterobacteriaceae. However, while in vitro inoculum effect has been reported, therapeutic relevance of this phenomenon remains questioned. METHODS Ten E. coli strains were used that included the wild-type CFT073 and its transconjugant CFT073-MCR-1 and eight susceptible clinical isolates. Mice with peritonitis were treated for 24 h with colistin sulfate. Bacterial loads were determined in peritoneal fluid (PF) and spleen and colistin-resistant mutants were detected. RESULTS MICs of colistin against the eight susceptible clinical strains and CFT073 ranged from 0.125 to 0.5 mg/L with an inoculum of 105 CFU/mL and from 2 to 4 mg/L with a 107 CFU/mL inoculum; 5/9 strains with an MIC of 4 mg/L were considered resistant according to EUCAST breakpoint (resistance, > 2 mg/L). When the bacterial load of wild-type CFT073 inoculated in mice increased from 107 to 108 CFU: i) mean log10 CFU reduction generated by colistin in PF and spleen decreased from 5.8/mL and 3.1/g, respectively, (p < 0.01) to 0.9/mL and 0.8/g, respectively (NS); ii) mice survival rate decreased from 15/15 (100%) to 6/15 (40%) (p = 0.017); and iii) proportion of mice with selection of colistin-resistant mutants increased from 4/15 to 15/15 (p < 0.01). These results were comparable to those obtained when peritonitis was produced with a 107 CFU bacterial load of E. coli CFT073 expressing mcr-1, for which the mean log10 CFU reductions were 3.5/mL and 0.6/g in PF and spleen, respectively (NS), and survival rate was 8/15 (53%) (p < 0.01 versus survival of mice infected with wild-type CFT073). CONCLUSIONS Phenotypic colistin resistance in wild-type E. coli due to an increase in inoculum size had a therapeutic impact in mice with peritonitis that was comparable to that observed when the mcr-1 gene was expressed.
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Affiliation(s)
- B Fantin
- IAME, INSERM UMR 1137, F-75018, Paris, France; Université Paris Diderot, Sorbonne Paris Cité, F-75018, Paris, France; AP-HP, Groupe Hospitalier Paris Nord Val de Seine, Service de médecine interne, F-92210, Clichy, France.
| | - J Poujade
- IAME, INSERM UMR 1137, F-75018, Paris, France
| | - N Grégoire
- University of Poitiers, School of Medicine and Pharmacy, INSERM UMR1070, France
| | - F Chau
- IAME, INSERM UMR 1137, F-75018, Paris, France; Université Paris Diderot, Sorbonne Paris Cité, F-75018, Paris, France
| | - A Roujansky
- IAME, INSERM UMR 1137, F-75018, Paris, France
| | - N Kieffer
- Emerging Antibiotic Resistance Unit, Medical and Molecular Microbiology, Department of Medicine, INSERM European Unit (LEA, IAME), University of Fribourg, Switzerland
| | - M Berleur
- IAME, INSERM UMR 1137, F-75018, Paris, France
| | - W Couet
- University of Poitiers, School of Medicine and Pharmacy, INSERM UMR1070, France
| | - P Nordmann
- IAME, INSERM UMR 1137, F-75018, Paris, France; Emerging Antibiotic Resistance Unit, Medical and Molecular Microbiology, Department of Medicine, INSERM European Unit (LEA, IAME), University of Fribourg, Switzerland; University Hospital and University of Lausanne, Lausanne, Switzerland
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19
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Chauzy A, Gaelzer Silva Torres B, Buyck J, de Jonge B, Adier C, Marchand S, Couet W, Grégoire N. Semimechanistic Pharmacodynamic Modeling of Aztreonam-Avibactam Combination to Understand Its Antimicrobial Activity Against Multidrug-Resistant Gram-Negative Bacteria. CPT Pharmacometrics Syst Pharmacol 2019; 8:815-824. [PMID: 31420947 PMCID: PMC6876579 DOI: 10.1002/psp4.12452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 06/17/2019] [Indexed: 11/24/2022]
Abstract
Aztreonam‐avibactam (ATM‐AVI) is a promising combination to treat serious infections caused by multidrug‐resistant (MDR) pathogens. Three distinct mechanisms of action have been previously characterized for AVI: inhibition of ATM degradation by β‐lactamases, proper bactericidal effect, and enhancement of ATM bactericidal activity. The aim of this study was to quantify the individual contribution of each of the three AVI effects. In vitro static time‐kill studies were performed on four MDREnterobacteriaceae with different β‐lactamase profiles. β‐Lactamase activity was characterized by measuring ATM concentrations over 27 hours. Data were analyzed by a semimechanistic pharmacodynamics modeling approach. Surprisingly, even though AVI prevented ATM degradation, the combined bactericidal activity was mostly explained by the enhancement of ATM effect within clinical range of ATM (5–125 mg/L) and AVI concentrations (0.9–22.5 mg/L). Therefore, when selecting a β‐lactamase inhibitor for combination with a β‐lactam, its capability to enhance the β‐lactam activity should be considered in addition to the spectrum of β‐lactamases inhibited.
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Affiliation(s)
- Alexia Chauzy
- INSERM, U1070, Pôle Biologie Santé, Poitiers Cedex 9, France.,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France
| | - Bruna Gaelzer Silva Torres
- INSERM, U1070, Pôle Biologie Santé, Poitiers Cedex 9, France.,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France
| | - Julien Buyck
- INSERM, U1070, Pôle Biologie Santé, Poitiers Cedex 9, France.,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France
| | | | - Christophe Adier
- INSERM, U1070, Pôle Biologie Santé, Poitiers Cedex 9, France.,Laboratoire de Toxicologie-Pharmacocinétique, CHU de Poitiers, Poitiers, France
| | - Sandrine Marchand
- INSERM, U1070, Pôle Biologie Santé, Poitiers Cedex 9, France.,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France.,Laboratoire de Toxicologie-Pharmacocinétique, CHU de Poitiers, Poitiers, France
| | - William Couet
- INSERM, U1070, Pôle Biologie Santé, Poitiers Cedex 9, France.,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France.,Laboratoire de Toxicologie-Pharmacocinétique, CHU de Poitiers, Poitiers, France
| | - Nicolas Grégoire
- INSERM, U1070, Pôle Biologie Santé, Poitiers Cedex 9, France.,Université de Poitiers, UFR de Médecine Pharmacie, Poitiers, France
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Boisson M, Torres BGS, Yani S, Couet W, Mimoz O, Dahyot-Fizelier C, Marchand S, Grégoire N. Reassessing the dosing of cefoxitin prophylaxis during major abdominal surgery: insights from microdialysis and population pharmacokinetic modelling. J Antimicrob Chemother 2019; 74:1975-1983. [DOI: 10.1093/jac/dkz139] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 03/04/2019] [Accepted: 03/07/2019] [Indexed: 11/13/2022] Open
Abstract
Abstract
Objectives
Cefoxitin is frequently used for surgical antibiotic prophylaxis (SAP). Using microdialysis, we evaluated whether the currently recommended dosing regimen is appropriate to maintain cefoxitin subcutaneous tissue concentrations above the MIC for pathogens involved in abdominal surgical site infection.
Methods
Data from eight patients undergoing major abdominal surgery were analysed using population pharmacokinetic modelling, and Monte Carlo simulations were conducted to determine the PTA for aerobic and anaerobic pathogens. ClinicalTrials.gov: NCT02703857.
Results
Only 2.3% and 47.4% of the simulated patients maintained cefoxitin subcutaneous concentrations above the MIC breakpoint for anaerobic (MIC = 16 mg/L) and aerobic (MIC = 8 mg/L) pathogens, respectively. New simulations with administration of a loading dose followed by a constant infusion of cefoxitin were conducted and demonstrate that, notwithstanding using the same total dose per unit of time, continuous infusion of cefoxitin can cover aerobes in 96.6% of the simulated patients, but remains insufficient for anaerobic bacteria.
Conclusions
The recommended dosing regimen of cefoxitin is insufficient for covering the usual bacteria during abdominal surgery. Administration of a loading dose followed by a constant infusion should be considered for aerobic bacteria and cefoxitin should be avoided as SAP for anaerobic bacteria.
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Affiliation(s)
- Matthieu Boisson
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- Département d’Anesthésie-Réanimation, CHU de Poitiers, 2 rue de la milétrie, Poitiers, France
| | - Bruna Gaelzer Silva Torres
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
| | - Sabrina Yani
- Département d’Anesthésie-Réanimation, CHU de Poitiers, 2 rue de la milétrie, Poitiers, France
| | - William Couet
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- Service de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la milétrie, Poitiers, France
| | - Olivier Mimoz
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- Service des Urgences & SAMU 86 - Centre 15, CHU de Poitiers, 2 rue de la milétrie, Poitiers, France
| | - Claire Dahyot-Fizelier
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- Département d’Anesthésie-Réanimation, CHU de Poitiers, 2 rue de la milétrie, Poitiers, France
| | - Sandrine Marchand
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- Service de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la milétrie, Poitiers, France
| | - Nicolas Grégoire
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- Service de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la milétrie, Poitiers, France
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21
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Pleau LP, Paradis P, Freniére JS, Huneault M, Gouin S, Aljamimi SM, Aydin YO, Duval S, Gauthier JC, Habel J, Jobin F, Maes F, Robichaud LR, Grégoire N, Morency S, Bernier M. 20 W splice-free erbium-doped all-fiber laser operating at 1610 nm. Opt Express 2018; 26:22378-22388. [PMID: 30130932 DOI: 10.1364/oe.26.022378] [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] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 07/21/2018] [Indexed: 06/08/2023]
Abstract
We report on a splice-free erbium-doped all-fiber laser emitting over 20 W at a wavelength of 1610 nm, with a slope efficiency of 19.6 % and an overall efficiency of 18.3% with respect to the launched pump power at 976 nm. The simple cavity design takes advantage of fiber Bragg gratings written directly in the gain fiber through the polymer coating and clad-pumping from a single commercial pump diode to largely simplify the assembling process, making this cavity ideal for large-scale commercial deployment. Two single-mode and singly erbium-doped silica fibers were fabricated in-house: the first to assess the effects of a high erbium concentration (0.36 mol.% Er2O3), yielding a low efficiency of 2.5 % with respect to launched pump power, and the second to achieve the improved result mentioned above (0.03 mol.% Er2O3). Numerical simulations show the link between the performance of each cavity and ion pair-induced quenching.
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22
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Boisson M, Mimoz O, Hadzic M, Marchand S, Adier C, Couet W, Grégoire N. Pharmacokinetics of intravenous and nebulized gentamicin in critically ill patients. J Antimicrob Chemother 2018; 73:2830-2837. [DOI: 10.1093/jac/dky239] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 05/23/2018] [Indexed: 11/14/2022] Open
Affiliation(s)
- Matthieu Boisson
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- CHU de Poitiers, Département d’Anesthésie-Réanimation, 2 rue de la milétrie, Poitiers, France
| | - Olivier Mimoz
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- CHU de Poitiers, Service des Urgences – SAMU 86 – SMUR, 2 rue de la milétrie, Poitiers, France
| | - Mirza Hadzic
- CHU de Poitiers, Département d’Anesthésie-Réanimation, 2 rue de la milétrie, Poitiers, France
| | - Sandrine Marchand
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- CHU de Poitiers, Service de Toxicologie-Pharmacocinétique, 2 rue de la milétrie, Poitiers, France
| | - Christophe Adier
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- CHU de Poitiers, Service de Toxicologie-Pharmacocinétique, 2 rue de la milétrie, Poitiers, France
| | - William Couet
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
- CHU de Poitiers, Service de Toxicologie-Pharmacocinétique, 2 rue de la milétrie, Poitiers, France
| | - Nicolas Grégoire
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
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23
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Bouchene S, Marchand S, Couet W, Friberg LE, Gobin P, Lamarche I, Grégoire N, Björkman S, Karlsson MO. A Whole-Body Physiologically Based Pharmacokinetic Model for Colistin and Colistin Methanesulfonate in Rat. Basic Clin Pharmacol Toxicol 2018; 123:407-422. [PMID: 29665289 DOI: 10.1111/bcpt.13026] [Citation(s) in RCA: 6] [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] [Received: 01/26/2018] [Accepted: 04/03/2018] [Indexed: 11/29/2022]
Abstract
Colistin is a polymyxin antibiotic used to treat patients infected with multidrug-resistant Gram-negative bacteria (MDR-GNB). The objective of this work was to develop a whole-body physiologically based pharmacokinetic (WB-PBPK) model to predict tissue distribution of colistin in rat. The distribution of a drug in a tissue is commonly characterized by its tissue-to-plasma partition coefficient, Kp . Colistin and its prodrug, colistin methanesulfonate (CMS) Kp priors, were measured experimentally from rat tissue homogenates or predicted in silico. The PK parameters of both compounds were estimated fitting in vivo their plasma concentration-time profiles from six rats receiving an i.v. bolus of CMS. The variability in the data was quantified by applying a nonlinear mixed effect (NLME) modelling approach. A WB-PBPK model was developed assuming a well-stirred and perfusion-limited distribution in tissue compartments. Prior information on tissue distribution of colistin and CMS was investigated following three scenarios: Kp was estimated using in silico Kp priors (I) or Kp was estimated using experimental Kp priors (II) or Kp was fixed to the experimental values (III). The WB-PBPK model best described colistin and CMS plasma concentration-time profiles in scenario II. Colistin-predicted concentrations in kidneys in scenario II were higher than in other tissues, which was consistent with its large experimental Kp prior. This might be explained by a high affinity of colistin for renal parenchyma and active reabsorption into the proximal tubular cells. In contrast, renal accumulation of colistin was not predicted in scenario I. Colistin and CMS clearance estimates were in agreement with published values. The developed model suggests using experimental priors over in silico Kp priors for kidneys to provide a better prediction of colistin renal distribution. Such models might serve in drug development for interspecies scaling and investigate the impact of disease state on colistin disposition.
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Affiliation(s)
- Salim Bouchene
- Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
| | - Sandrine Marchand
- INSERM U-1070, Pôle Biologie Santé, Poitiers, France.,Laboratoire de Toxicologie et Pharmacocinétique, CHU de Poitiers, Poitiers, France
| | - William Couet
- INSERM U-1070, Pôle Biologie Santé, Poitiers, France.,Laboratoire de Toxicologie et Pharmacocinétique, CHU de Poitiers, Poitiers, France
| | - Lena E Friberg
- Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
| | - Patrice Gobin
- INSERM U-1070, Pôle Biologie Santé, Poitiers, France
| | | | - Nicolas Grégoire
- INSERM U-1070, Pôle Biologie Santé, Poitiers, France.,Laboratoire de Toxicologie et Pharmacocinétique, CHU de Poitiers, Poitiers, France
| | - Sven Björkman
- Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
| | - Mats O Karlsson
- Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
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Boisson M, Grégoire N, Cormier M, Gobin P, Marchand S, Couet W, Mimoz O. Pharmacokinetics of nebulized colistin methanesulfonate in critically ill patients. J Antimicrob Chemother 2018; 72:2607-2612. [PMID: 28575278 DOI: 10.1093/jac/dkx167] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 04/29/2017] [Indexed: 01/15/2023] Open
Abstract
Objectives Optimal dosing for nebulized colistin methanesulfonate (CMS), the prodrug of colistin, is unknown. We describe the pulmonary and systemic pharmacokinetics of CMS and colistin following nebulization of 0.5 million IU (MIU) of CMS in ventilated patients. Methods Twelve critically ill patients received 0.5 MIU of CMS administered every 8 h as 30 min nebulizations. Blood samples were collected immediately before and until 8 h after first nebulization; mini-bronchoalveolar lavage (mini-BAL) was performed at 1 and 5 h or 3 and 8 h (six patients each) post-dose. Pharmacokinetic analysis was performed for CMS and colistin plasma concentrations using a non-compartmental method. ClinicalTrials.gov: NCT01060891. Results After nebulization, CMS concentrations in epithelial lining fluid (ELF) were much higher (100- to 1000-fold) than those in plasma. Concentrations of colistin in ELF should be considered with caution because when <6 mg/L in BAL, colistin bound to mini-BAL devices. Nevertheless, CMS and colistin concentrations in ELF were much lower than expected from previous results with a 2 MIU dose. From CMS plasma pharmacokinetics it was shown that CMS systemic bioavailability was only slightly decreased for the 0.5 MIU dose compared with 2 MIU. Conclusions This study shows that CMS concentrations were much higher (100- to 1000-fold) in ELF than in plasma after a 0.5 MIU aerosol of CMS, but much lower (10-fold) than expected from previous results with a 2 MIU dose. Therefore, until new pharmacokinetic and pharmacodynamic assessments of the treatment of ventilator-associated pneumonia with nebulized CMS are performed, the 2 MIU dose should be preferred to the 0.5 MIU dose.
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Affiliation(s)
- Matthieu Boisson
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, 86000 Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, 86000 Poitiers, France.,Département d'Anesthésie-Réanimation, CHU de Poitiers, 2 rue de la milétrie, 86000 Poitiers, France
| | - Nicolas Grégoire
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, 86000 Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, 86000 Poitiers, France
| | - Marielle Cormier
- Département d'Anesthésie-Réanimation, CHU de Poitiers, 2 rue de la milétrie, 86000 Poitiers, France
| | - Patrice Gobin
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, 86000 Poitiers, France.,Service de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la milétrie, 86000 Poitiers, France
| | - Sandrine Marchand
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, 86000 Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, 86000 Poitiers, France.,Service de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la milétrie, 86000 Poitiers, France
| | - William Couet
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, 86000 Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, 86000 Poitiers, France.,Service de Toxicologie-Pharmacocinétique, CHU de Poitiers, 2 rue de la milétrie, 86000 Poitiers, France
| | - Olivier Mimoz
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, 86000 Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, 86000 Poitiers, France.,Service des Urgences - SAMU 86 - SMUR, CHU de Poitiers, 2 rue de la milétrie, 86000 Poitiers, France
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25
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Magréault S, Petyt C, Senneville E, Fron D, Nectoux E, Loiez C, Marchand S, Grégoire N, Couet W. Pharmacokinetics of colistin in a 8-year-old child with acute bone infection. Clin Microbiol Infect 2018; 24:1025-1026. [PMID: 29723571 DOI: 10.1016/j.cmi.2018.04.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 04/15/2018] [Accepted: 04/21/2018] [Indexed: 10/17/2022]
Affiliation(s)
- S Magréault
- INSERM U1070, Université de Poitiers, CHU de Poitiers, Poitiers, France
| | | | | | | | | | | | - S Marchand
- INSERM U1070, Université de Poitiers, CHU de Poitiers, Poitiers, France
| | - N Grégoire
- INSERM U1070, Université de Poitiers, CHU de Poitiers, Poitiers, France
| | - W Couet
- INSERM U1070, Université de Poitiers, CHU de Poitiers, Poitiers, France.
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26
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Grégoire M, Libois JB, Waast D, Gaborit B, Dauty M, Deslandes G, Dailly E, Touchais S, Boutoille D, Grégoire N, Couet W. Pharmacokinetics of Tedizolid in an Obese Patient after Bariatric Surgery. Antimicrob Agents Chemother 2018; 62:e02432-17. [PMID: 29378714 PMCID: PMC5913932 DOI: 10.1128/aac.02432-17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 11/27/2017] [Accepted: 01/22/2018] [Indexed: 01/26/2023] Open
Abstract
An obese woman was treated with oral tedizolid 200 mg once daily for pseudoarthrosis 10 years after Roux-en-Y bypass surgery. Total plasma peak concentration was 2.12 mg/liter 3 h after intake, and area under the concentration-time curve from 0 to 24 h (AUC0-24) was 28.3 mg/liter · h. The AUC0-24/MIC ratio for unbound concentrations and for sensitive Staphylococcus and Streptococcus strains was ≥10.8, higher than the target ratio of 3. These results support the use of tedizolid without adjustment after bariatric surgery.
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Affiliation(s)
- Matthieu Grégoire
- Clinical Pharmacology Department, CHU Nantes, Nantes, France
- UMR INSERM 1235, The Enteric Nervous System in Gut and Brain Disorders, University of Nantes, Nantes, France
| | | | - Denis Waast
- Trauma and Orthopedics Department, CHU Nantes, Nantes, France
| | - Benjamin Gaborit
- Infectious Diseases Department, CHU Nantes and CIC 1413, INSERM, Nantes, France
- EA 3826 Thérapeutiques Cliniques et Expérimentales des Infections, University of Nantes, Nantes, France
| | - Marc Dauty
- Physical and Rehabilitation Medicine Department, CHU Nantes, Nantes, France
| | | | - Eric Dailly
- Clinical Pharmacology Department, CHU Nantes, Nantes, France
- EE1701 Microbiotas, Hosts, Antibiotics and Bacterial Resistances, University of Nantes, Nantes, France
| | - Sophie Touchais
- Trauma and Orthopedics Department, CHU Nantes, Nantes, France
| | - David Boutoille
- Infectious Diseases Department, CHU Nantes and CIC 1413, INSERM, Nantes, France
- EA 3826 Thérapeutiques Cliniques et Expérimentales des Infections, University of Nantes, Nantes, France
| | - Nicolas Grégoire
- INSERM U1070, Université de Poitiers, CHU de Poitiers, Poitiers, France
| | - William Couet
- INSERM U1070, Université de Poitiers, CHU de Poitiers, Poitiers, France
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27
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Viel A, Henri J, Bouchène S, Laroche J, Rolland JG, Manceau J, Laurentie M, Couet W, Grégoire N. A Population WB-PBPK Model of Colistin and its Prodrug CMS in Pigs: Focus on the Renal Distribution and Excretion. Pharm Res 2018. [PMID: 29532176 DOI: 10.1007/s11095-018-2379-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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] [Indexed: 02/04/2023]
Abstract
PURPOSE The objective was the development of a whole-body physiologically-based pharmacokinetic (WB-PBPK) model for colistin, and its prodrug colistimethate sodium (CMS), in pigs to explore their tissue distribution, especially in kidneys. METHODS Plasma and tissue concentrations of CMS and colistin were measured after systemic administrations of different dosing regimens of CMS in pigs. The WB-PBPK model was developed based on these data according to a non-linear mixed effect approach and using NONMEM software. A detailed sub-model was implemented for kidneys to handle the complex disposition of CMS and colistin within this organ. RESULTS The WB-PBPK model well captured the kinetic profiles of CMS and colistin in plasma. In kidneys, an accumulation and slow elimination of colistin were observed and well described by the model. Kidneys seemed to have a major role in the elimination processes, through tubular secretion of CMS and intracellular degradation of colistin. Lastly, to illustrate the usefulness of the PBPK model, an estimation of the withdrawal periods after veterinary use of CMS in pigs was made. CONCLUSIONS The WB-PBPK model gives an insight into the renal distribution and elimination of CMS and colistin in pigs; it may be further developed to explore the colistin induced-nephrotoxicity in humans.
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Affiliation(s)
- Alexis Viel
- Inserm U1070, Pôle Biologie Santé, Poitiers, France
- Anses, Laboratoire de Fougères, Fougères, France
- Université de Poitiers, UFR Médecine-Pharmacie, Poitiers, France
| | - Jérôme Henri
- Anses, Laboratoire de Fougères, Fougères, France
| | | | - Julian Laroche
- Inserm U1070, Pôle Biologie Santé, Poitiers, France
- CHU Poitiers, Laboratoire de Toxicologie-Pharmacocinétique, Poitiers, France
| | | | | | | | - William Couet
- Inserm U1070, Pôle Biologie Santé, Poitiers, France
- Université de Poitiers, UFR Médecine-Pharmacie, Poitiers, France
- CHU Poitiers, Laboratoire de Toxicologie-Pharmacocinétique, Poitiers, France
| | - Nicolas Grégoire
- Inserm U1070, Pôle Biologie Santé, Poitiers, France.
- Université de Poitiers, UFR Médecine-Pharmacie, Poitiers, France.
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Viel A, Henri J, Perrin-Guyomard A, Laroche J, Couet W, Grégoire N, Laurentie M. Lack of experimental evidence to support mcr-1-positive Escherichia coli strain selection during oral administration of colistin at recommended and higher dose given by gavage in weaned piglets. Int J Antimicrob Agents 2017; 51:128-131. [PMID: 28668687 DOI: 10.1016/j.ijantimicag.2017.04.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 04/12/2017] [Indexed: 11/18/2022]
Abstract
In this study, we assessed the selective effect of colistin administered orally to healthy weaned piglets harbouring an intestinal mcr-1-positive Escherichia coli strain. Maximum recommended dose and a higher dose often used in European pig farms were given by gavage. No selection of the mcr-1-positive strain was observed in our controlled conditions, irrespective of the dose. Further investigations in real farming conditions seem necessary.
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Affiliation(s)
- Alexis Viel
- Inserm U1070, Pôle Biologie Santé, Poitiers, France; Université de Poitiers, UFR Médecine-Pharmacie, Poitiers, France; Anses, Laboratoire de Fougères, Fougères, France
| | - Jérôme Henri
- Anses, Laboratoire de Fougères, Fougères, France
| | | | - Julian Laroche
- Inserm U1070, Pôle Biologie Santé, Poitiers, France; CHU Poitiers, Poitiers, France
| | - William Couet
- Inserm U1070, Pôle Biologie Santé, Poitiers, France; Université de Poitiers, UFR Médecine-Pharmacie, Poitiers, France; CHU Poitiers, Poitiers, France
| | - Nicolas Grégoire
- Inserm U1070, Pôle Biologie Santé, Poitiers, France; Université de Poitiers, UFR Médecine-Pharmacie, Poitiers, France.
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30
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Grégoire N, Aranzana-Climent V, Magréault S, Marchand S, Couet W. Clinical Pharmacokinetics and Pharmacodynamics of Colistin. Clin Pharmacokinet 2017; 56:1441-1460. [DOI: 10.1007/s40262-017-0561-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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Gaspar MC, Grégoire N, Sousa JJ, Pais AA, Lamarche I, Gobin P, Olivier JC, Marchand S, Couet W. Pulmonary pharmacokinetics of levofloxacin in rats after aerosolization of immediate-release chitosan or sustained-release PLGA microspheres. Eur J Pharm Sci 2016; 93:184-91. [DOI: 10.1016/j.ejps.2016.08.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 07/21/2016] [Accepted: 08/11/2016] [Indexed: 01/08/2023]
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Jacobs M, Grégoire N, Couet W, Bulitta JB. Distinguishing Antimicrobial Models with Different Resistance Mechanisms via Population Pharmacodynamic Modeling. PLoS Comput Biol 2016; 12:e1004782. [PMID: 26967893 PMCID: PMC4788427 DOI: 10.1371/journal.pcbi.1004782] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [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: 06/08/2015] [Accepted: 02/01/2016] [Indexed: 12/02/2022] Open
Abstract
Semi-mechanistic pharmacokinetic-pharmacodynamic (PK-PD) modeling is increasingly used for antimicrobial drug development and optimization of dosage regimens, but systematic simulation-estimation studies to distinguish between competing PD models are lacking. This study compared the ability of static and dynamic in vitro infection models to distinguish between models with different resistance mechanisms and support accurate and precise parameter estimation. Monte Carlo simulations (MCS) were performed for models with one susceptible bacterial population without (M1) or with a resting stage (M2), a one population model with adaptive resistance (M5), models with pre-existing susceptible and resistant populations without (M3) or with (M4) inter-conversion, and a model with two pre-existing populations with adaptive resistance (M6). For each model, 200 datasets of the total bacterial population were simulated over 24h using static antibiotic concentrations (256-fold concentration range) or over 48h under dynamic conditions (dosing every 12h; elimination half-life: 1h). Twelve-hundred random datasets (each containing 20 curves for static or four curves for dynamic conditions) were generated by bootstrapping. Each dataset was estimated by all six models via population PD modeling to compare bias and precision. For M1 and M3, most parameter estimates were unbiased (<10%) and had good imprecision (<30%). However, parameters for adaptive resistance and inter-conversion for M2, M4, M5 and M6 had poor bias and large imprecision under static and dynamic conditions. For datasets that only contained viable counts of the total population, common statistical criteria and diagnostic plots did not support sound identification of the true resistance mechanism. Therefore, it seems advisable to quantify resistant bacteria and characterize their MICs and resistance mechanisms to support extended simulations and translate from in vitro experiments to animal infection models and ultimately patients. Mathematical models are increasingly used for analysis and interpretation of in vitro efficacy results of antimicrobial drugs. Various models are employed in the scientific literature and it seems that they are equally able to describe the observed data. The aim of the present study was to compare different models in various experimental designs and with different resistance mechanisms of bacteria. For that purpose we have generated experimental data through Monte-Carlo simulations and then used six different mathematical models to analyze these results. We showed that statistical comparison of models did not allow determining which was the true mechanism of resistance, i.e. the one used for the simulation step. Moreover mathematical parameters for bacterial resistance were estimated with bias and with a low precision except for the simpler cases. This suggests that the choice of the mathematical model for data analysis should be guided by experimental characterization of the bacterial mechanism of resistance.
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Affiliation(s)
| | | | | | - Jurgen B. Bulitta
- Center for Pharmacometrics and Systems Pharmacology, Department of Pharmaceutics, College of Pharmacy, University of Florida, Gainesville, Florida, United States of America
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Pham DD, Grégoire N, Couet W, Gueutin C, Fattal E, Tsapis N. Pulmonary delivery of pyrazinamide-loaded large porous particles. Eur J Pharm Biopharm 2015; 94:241-50. [PMID: 26036447 DOI: 10.1016/j.ejpb.2015.05.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Revised: 05/20/2015] [Accepted: 05/26/2015] [Indexed: 10/23/2022]
Abstract
We have improved the aerodynamic properties of pyrazinamide loaded large porous particles (PZA-LPPs) designed for pulmonary delivery. To overcome the segregation of the different components occurring during the spray drying process and to obtain homogeneous LPPs, spray drying parameters were modified to decrease the drying speed. As a result, good aerodynamic properties for lung delivery were obtained with a fine particle fraction (FPF) of 40.1±1.0%, an alveolar fraction (AF) of 29.6±3.1%, a mass median aerodynamic diameter (MMADaer) of 4.1±0.2μm and a geometric standard deviation (GSD) of 2.16±0.16. Plasma and epithelial lining fluid (ELF) concentrations of pyrazinamide were evaluated after intratracheal insufflation of PZA-LPPs (4.22mgkg(-1)) into rats and compared to intravenous administration (iv) of a pyrazinamide solution (5.82mgkg(-1)). The in vivo pharmacokinetic evaluation of PZA-LPPs in rats reveals that intratracheal insufflation of PZA-LPPs leads to a rapid absorption in plasma with an absolute bioavailability of 66%. This proves that PZA-LPPs dissolve fast upon deposition and that PZA crosses efficiently the lung barrier to reach the systemic circulation. PZA concentrations were 1.28-fold higher in ELF after intratracheal administration than after iv administration and the ratio of ELF concentrations over plasma concentrations was 2-fold greater. Although these improvements are moderate, lung delivery of PZA appears an interesting alternative to oral delivery of the molecule and should now be tested in an infected animal model to evaluate its efficacy against Mycobacterium tuberculosis.
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Affiliation(s)
- Dinh-Duy Pham
- Univ Paris-Sud, Institut Galien Paris-Sud, CNRS UMR 8612, LabEx LERMIT, Châtenay-Malabry, France; University of Medicine and Pharmacy, Faculty of Pharmacy, Pharmaceutics Department, Ho Chi Minh City, Viet Nam; Division of Pharmacotechnology and Biopharmacy, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.
| | | | | | - Claire Gueutin
- Univ Paris-Sud, Institut Galien Paris-Sud, CNRS UMR 8612, LabEx LERMIT, Châtenay-Malabry, France
| | - Elias Fattal
- Univ Paris-Sud, Institut Galien Paris-Sud, CNRS UMR 8612, LabEx LERMIT, Châtenay-Malabry, France
| | - Nicolas Tsapis
- Univ Paris-Sud, Institut Galien Paris-Sud, CNRS UMR 8612, LabEx LERMIT, Châtenay-Malabry, France.
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Grégoire N, Nezri C, Gorde-Durand JM, Bouras C, Bert J, Salamon G. Cerebral metabolic changes induced by an unconventional agent: experimental model for some human degenerative diseases of the central nervous system. Monogr Neural Sci 2015; 11:193-203. [PMID: 6429523 DOI: 10.1159/000409211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Veinstein A, Debouverie O, Grégoire N, Goudet V, Adier C, Robert R, Couet W. Lack of effect of extracorporeal membrane oxygenation on tigecycline pharmacokinetics. J Antimicrob Chemother 2011; 67:1047-8. [PMID: 22207598 DOI: 10.1093/jac/dkr550] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mimoz O, Chauvet S, Grégoire N, Marchand S, Le Guern ME, Saleh A, Couet W, Debaene B, Levy RH. Nefopam pharmacokinetics in patients with end-stage renal disease. Anesth Analg 2010; 111:1146-53. [PMID: 20971961 DOI: 10.1213/ane.0b013e3181f33488] [Citation(s) in RCA: 14] [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: 01/29/2023]
Abstract
BACKGROUND Treatment of intense postoperative pain in patients with end-stage renal disease (ESRD) is a recurrent problem for anesthesiologists because of the risk of accumulation of numerous molecules and their metabolites. Nefopam is a potent analgesic metabolized by the liver and weakly eliminated intact in urine that may offer advantages for use in patients with ESRD because it lacks respiratory-depressive effects. However, the effects of renal failure on nefopam disposition have never been investigated. METHODS We studied 12 ESRD patients (creatinine clearance < 20 mL/min, mean age 57 ± 13 years) having surgery under general anesthesia to create or repair an arteriovenous fistula. Postoperatively, after complete recovery from anesthesia, each patient received a single 20-mg dose of nefopam IV over 30 minutes. Nefopam and desmethyl-nefopam concentrations in plasma samples obtained over 48 hours were determined by liquid chromatography-tandem mass spectrometry. The pharmacokinetic parameter values obtained were compared with those of 12 healthy 50- to 60-year-old volunteers who also received a single 20-mg nefopam infusion over 30 minutes using a population pharmacokinetic approach. RESULTS Healthy volunteers and ESRD patients had comparable demographic characteristics. In comparison with those volunteers, ESRD patients had a lower volume of central compartment (115 and 53 L vs. 264 L for patients not yet hemodialyzed and on chronic hemodialysis, respectively; P < 0.001) and lower mean nefopam clearance (37.0 and 27.3 L/h vs. 52.9 L/h, P < 0.001), resulting in higher mean nefopam peak concentration (121 and 223 ng/mL vs. 61 ng/mL, P < 0.001). CONCLUSIONS Nefopam distribution and elimination are altered in patients with ESRD, resulting in heightened exposure. To avoid too-high concentration peaks, it is suggested that the daily nefopam dose be reduced by 50%.
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Affiliation(s)
- Olivier Mimoz
- Réanimation Chirurgicale Polyvalente, CHU de Poitiers, Poitiers, France.
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Delord JP, Umlil A, Guimbaud R, Grégoire N, Lafont T, Canal P, Bugat R, Chatelut E. Population pharmacokinetics of oxaliplatin. Cancer Chemother Pharmacol 2003; 51:127-31. [PMID: 12647013 DOI: 10.1007/s00280-002-0550-3] [Citation(s) in RCA: 28] [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] [Received: 07/01/2002] [Accepted: 10/25/2002] [Indexed: 10/25/2022]
Abstract
The objective of this study was to explore correlations between a variety of covariates and oxaliplatin ultrafilterable and blood pharmacokinetic parameters. Data from 40 patients receiving oxaliplatin combined with 5-fluorouracil and levofolinic acid as standard treatment for advanced colorectal cancer were analysed. Plasma ultrafilterable, blood, and urine platinum concentrations were determined by flameless atomic absorption spectrophotometry. Data were analysed according to a population pharmacokinetic method using the NONMEM program. The best fit for oxaliplatin plasma ultrafilterable clearance (CL) was given by the following equation, which considers four covariates: body surface area (BSA, in metres squared), age (in years), sex (0 if male, 1 if female), and serum creatinine (Scr, in micromoles per liter): CL (l/h)=5.49xBSA+4.55xBSAx(140-AGE)x(1-0.15xSEX)/Scr. By taking into account these covariates, the interindividual variability in CL decreased from 43% to 33%. Renal clearance represented 34% of the overall elimination. This value was obtained by recovering urine over only 5 h from the beginning of the infusion and modelling the data using NONMEM. We would recommend the use of this methodology for pharmacokinetic studies in oncology in which renal clearances of the drug are presently rarely explored. The oxaliplatin blood concentrations versus time observed during the three-cycle period were well-described by a three-compartment model with first-order elimination from the central compartment. No significant intrapatient pharmacokinetic variability was observed between cycles. The relationship we obtained using the population approach between oxaliplatin CL and covariates may allow rational reduction of oxaliplatin dose in cases of elevated serum creatinine levels.
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Chatelut E, Rostaing L, Grégoire N, Payen JL, Pujol A, Izopet J, Houin G, Canal P. A pharmacokinetic model for alpha interferon administered subcutaneously. Br J Clin Pharmacol 1999; 47:365-71. [PMID: 10233199 PMCID: PMC2014240 DOI: 10.1046/j.1365-2125.1999.00912.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [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: 07/14/1998] [Accepted: 11/18/1998] [Indexed: 11/20/2022] Open
Abstract
AIMS To model the pharmacokinetic profiles of alpha interferon (alphaIFN) after a single subcutaneous (s.c.) injection of 3 million units of alpha 2b interferon, to correlate the pharmacokinetic parameters with patient demographic covariates, and to develop a limiting sampling strategy for determining the alphaIFN plasma area under the curve of concentration vs time (AUC). METHODS The plasma alphaIFN pharmacokinetics were determined in 27 patients with chronic hepatitis C virus infection after the first s.c. injection of the drug. Ten patients had normal renal function and 17 were chronic haemodialysis patients. Plasma samples were assayed by an Elisa method. Concentration-time data was analysed by a population approach using NONMEM. RESULTS The pharmacokinetic model which better described the concentration vs time data was a one-compartment model with two processes of absorption: a zero-order followed by a first-order process. The mean clearance of dialysis patients represented 37% (with 95% confidence interval: 30% -44%) of the mean value of the patients with normal renal function. The volume of distribution was significantly correlated to the body surface area. Bayesian analysis using NONMEM allowed determination of the individual plasma AUC from three samples within the 24 h period post s.c. injection. CONCLUSIONS The present pharmacokinetic model will allow one to obtain individual parameters such as, the area under the curve of concentration vs time from a limited-sampling strategy, and to perform pharmacokinetic-pharmacodynamic analysis of combined alphaIFN plasma concentrations and viraemic data.
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Affiliation(s)
- E Chatelut
- Institut Claudius-Regaud, Centre Hospitalier Universitaire, Toulouse, France
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Canal P, Gautié L, Grégoire N, Perdaems N, Chatelut E. [Anticancer drugs pharmacokinetics update]. Bull Cancer 1999; 86:85-9. [PMID: 10029710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Affiliation(s)
- P Canal
- Laboratoire de pharmacologie, Institut Claudius-Regaud, 20-24, rue du Pont-Saint-Pierre, 31052 Toulouse Cedex
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Grégoire N, Lebrun F, Fahn L, Salamon G, Nicoli J. A study of GABAergic system in Scrapie-infected hamsters after striatal microinoculation of the agent. Neurosci Lett 1993; 163:141-4. [PMID: 8309620 DOI: 10.1016/0304-3940(93)90366-s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Experimental Scrapie in hamster is a simple, reproducible model of prion diseases that occur in humans and animals. Stereotaxic microinoculation (0.5 microliter) of the agent (263 K) into a specific cerebral structure (striatum) in hamster, previously developed in our group, gives the opportunity to further investigate the pathogenesis of these degenerative diseases and to more precisely define the brain areas and the groups of cells more vulnerable to the effects of the agent. In this model, early significant changes of glutamic acid decarboxylase (GAD) activity in striatum suggested a preferential alteration of the GABA system. The present study was focused on the effects of Scrapie agent directly injected into striatum on GABA neurons at the presynaptic level (GABA uptake) and at the postsynaptic level (GABAA receptors). The high-affinity [3H]GABA uptake is not changed in the Scrapie-injected striatum neither in the controlateral site and the kinetics (Km, Vmax) values are not statistically different for control and Scrapie-inoculated animals. The binding of [3H]GABA (Scatchard analysis) to cerebral membranes does not seem to be altered either at the local site of agent inoculation (striatum) neither at distance in the cerebellum: the affinity constant (Kd) to the ligand and the maximal number of receptor sites were of the same magnitude in control and Scrapie animals, but we do not have a statistical analysis. These effects are completely different of those of a neurotoxin. The present data suggest that the effects of prion agent may be very limited and very specific to some cellular mechanisms, without altering the whole cellular machinery, as recently shown in an in vitro model.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- N Grégoire
- Laboratoire de Biochimie et Circulation cérébrale, CHU Tímone, Marseille, France
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Grégoire N. [The blood-brain barrier]. J Radiol 1990; 71:481-7. [PMID: 2266520] [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: 12/31/2022]
Abstract
The blood-brain barrier (BBB) is present on three sites: the brain vessels, the choroid plexus and the arachnoid membrane. It is made of nonfenestrated endothelial or epithelial cells interconnected by tight junctions. Biochemically, the BBB is formed by bimolecular layers of phospholipids into which globular proteins are inserted. Exchanges through the BBB depend on whether the substances exchanged are soluble in water or in lipids. Hydrosoluble substances are largely excluded from the brain by the BBB; liposoluble substances pass the barrier easily by passive or active mechanisms. Water movements through the BBB are related to variations in osmolality. These data are of the utmost importance in all brain diseases with rupture of the BBB and in all neuroradiological procedures using contrast media.
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Affiliation(s)
- N Grégoire
- Laboratoire de Biochimie et Circulation cérébrale, CHU Timone, Marseille
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Grégoire N. Méthode simple pour la collecte des échantillons de sang chez les bovins à l'abattoir. Can Vet J 1987; 28:565-8. [PMID: 17422858 PMCID: PMC1680556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
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Grégoire N, Higgins R, Robinson Y. Isolation of leptospires from nephritic kidneys of beef cattle at slaughter. Am J Vet Res 1987; 48:370-1. [PMID: 3565891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Of 955 beef cattle slaughtered at an abattoir in Quebec from May to August 1985, 122 (13%) had lesions of focal interstitial nephritis. Nephritic kidneys were collected for leptospiral culture, and matching blood samples were examined serologically. Leptospires were isolated from the kidneys of 35 (29%) cattle. Antibodies to Leptospira interrogans serovar hardjo were found in 29 (24%) cattle and to pomona in 13 (10%).
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Abstract
Local cerebral glucose utilization (LCGU) was determined in 2- to 8-day-old beagle dogs by the quantitative 14C-deoxyglucose autoradiographic method. In physiologically controlled puppies (BP 66 +/- 3 mm Hg; paO2 71 +/- 2 mm Hg; paCO2 35 mm Hg, pH 7.39 +/- 0.04; hematocrit 39 +/- 2%), the 2-deoxyglucose (2-DG) autoradiographs and quantitative data reveal a characteristic pattern of regional energy metabolic needs in the normal newborn brain: highest glucose consumption values are found in brain stem nuclei (inferior olivary nucleus 19 +/- 4 mumol/100 g/min; vestibular nucleus 26 +/- 5; red nucleus 15 +/- 2) and in selected deep cerebral structures (subthalamic nucleus 18 +/- 4; ventrolateral thalamic nucleus 12 +/- 2, ...) whereas consistently relative lower glucose consumption is found in the cerebral cortex (mean 7 +/- 1). This data is in agreement with local cerebral blood flow studies in the newborn puppy. A characteristic functional anatomy of the newborn dog brain is demonstrated. The value of 0.558 +/- 0.031 for the lumped constant was used in the calculation of LCGU. In puppies previously asphyxiated for 2.5-3.5 min 1-2 days prior to the 2-DG procedure, no significant effect upon regional metabolism was demonstrated.
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Ardry R, Grégoire N. [Study in tissue culture of antitissue antibodies]. Ann Pharm Fr 1966; 24:269-74. [PMID: 5940314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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