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Juhász ÁG, Nanys M, Pinke B, Fadel A, Godzierz M, Juriga-Tóth K, Molnár K, Juriga D, Jedlovszky-Hajdú A. Formation of Three-Dimensional Polysuccinimide Electrospun Fiber Meshes Induced by the Combination of CaCl 2 and Humidity. Macromol Rapid Commun 2024; 45:e2300625. [PMID: 38206977 DOI: 10.1002/marc.202300625] [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: 10/26/2023] [Revised: 01/03/2024] [Indexed: 01/13/2024]
Abstract
Even though electrospinning is getting more and more attention, the preparation of 3D nanofibrous meshes is still a big challenge that limits the application of electrospun materials, especially in tissue engineering. To overcome this problem, several solutions are introduced but most of them focus on the postprocessing of the electrospun meshes. This paper presents a straightforward novel method that utilizes the joint effect of the addition of CaCl2 and the relative environmental humidity (RH), which can induce the random 3D formation of polysuccinimide (PSI) electrospun fibers with different such as wrinkled or ribbon-like structures. Although the effect of humidity and inorganic salt additives on the micro and macrostructure of electrospun fibers is known, the connection between the two in this manner has never been presented. To investigate the effect, fibers with different PSI and CaCl2 concentrations at different humidity RH levels are prepared, and their microstructure is visualized with high-resolution scanning electron microscopy (SEM). To reveal the nature of the interaction between the polymer and the CaCl2, Fourier-transformed infrared (FTIR), X-ray diffraction (XRD), and thermogravimetry (TGA) measurements are carried out and 3D nanofibrous structures are obtained.
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Affiliation(s)
- Ákos György Juhász
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, Nagyvárad tér 4., Budapest, H-1089, Hungary
| | - Monika Nanys
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, Nagyvárad tér 4., Budapest, H-1089, Hungary
| | - Balázs Pinke
- Department of Polymer Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, H-1111, Hungary
| | - Alexandre Fadel
- UMR 8207, UMET-Unité Matériaux et Transformations, University Lille, CNRS, INRAE, Centrale Lille, Lille, F-59000, France
| | - Marcin Godzierz
- Centre of Polymer and Carbon Materials Polish Academy of Sciences M. Curie-Skłodowskiej 34 Str, Zabrze, 41-819, Poland
| | - Krisztina Juriga-Tóth
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, Nagyvárad tér 4., Budapest, H-1089, Hungary
| | - Kolos Molnár
- Department of Polymer Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, Budapest, H-1111, Hungary
- HUN-REN-BME Research Group for Composite Science and Technology, Műegyetem rkp. 3, Budapest, H-1111, Hungary
- MTA-BME Lendület Sustainable Polymers Research Group, Műegyetem rkp. 3, Budapest, H-1111, Hungary
| | - Dávid Juriga
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, Nagyvárad tér 4., Budapest, H-1089, Hungary
| | - Angéla Jedlovszky-Hajdú
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, Nagyvárad tér 4., Budapest, H-1089, Hungary
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Demoulin CF, Sforna MC, Lara YJ, Cornet Y, Somogyi A, Medjoubi K, Grolimund D, Sanchez DF, Tachoueres RT, Addad A, Fadel A, Compère P, Javaux EJ. Polysphaeroides filiformis, a proterozoic cyanobacterial microfossil and implications for cyanobacteria evolution. iScience 2024; 27:108865. [PMID: 38313056 PMCID: PMC10837632 DOI: 10.1016/j.isci.2024.108865] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/29/2023] [Accepted: 01/08/2024] [Indexed: 02/06/2024] Open
Abstract
Deciphering the fossil record of cyanobacteria is crucial to understand their role in the chemical and biological evolution of the early Earth. They profoundly modified the redox conditions of early ecosystems more than 2.4 Ga ago, the age of the Great Oxidation Event (GOE), and provided the ancestor of the chloroplast by endosymbiosis, leading the diversification of photosynthetic eukaryotes. Here, we analyze the morphology, ultrastructure, chemical composition, and metals distribution of Polysphaeroides filiformis from the 1040-1006 Ma Mbuji-Mayi Supergroup (DR Congo). We evidence trilaminar and bilayered ultrastructures for the sheath and the cell wall, respectively, and the preservation of Ni-tetrapyrrole moieties derived from chlorophyll in intracellular inclusions. This approach allows an unambiguous interpretation of P. filiformis as a branched and multiseriate photosynthetic cyanobacterium belonging to the family of Stigonemataceae. It also provides a possible minimum age for the emergence of multiseriate true branching nitrogen-fixing and probably heterocytous cyanobacteria.
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Affiliation(s)
- Catherine F Demoulin
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium
| | - Marie Catherine Sforna
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium
- Centre de Biophysique Moléculaire, (UPR CNRS 4301), 45071 Orléans, France
| | - Yannick J Lara
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium
| | - Yohan Cornet
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium
| | | | | | - Daniel Grolimund
- Paul Scherrer Institut, Swiss Light Source, 5232 Villigen PSI, Switzerland
| | | | | | - Ahmed Addad
- Unité Matériaux et Transformations (UMR CNRS 8207), Université Lille 1 - Sciences et Technologies, 59650 Villeneuve d'Ascq, France
| | - Alexandre Fadel
- Unité Matériaux et Transformations (UMR CNRS 8207), Université Lille 1 - Sciences et Technologies, 59650 Villeneuve d'Ascq, France
| | - Philippe Compère
- Functional and Evolutive Morphology, UR FOCUS, and Center for Applied Research and Education in Microscopy (CAREM-ULiege), University of Liège, 4000 Liège, Belgium
| | - Emmanuelle J Javaux
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, 4000 Liège, Belgium
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Henaff C, Siepmann J, Siepmann F, Danède F, Avettand-Fènoël MN, Vérin J, Fadel A, Willart JF. Exploration of the physical states of riboflavin (free base) by mechanical milling. Int J Pharm 2023; 645:123416. [PMID: 37716485 DOI: 10.1016/j.ijpharm.2023.123416] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/18/2023]
Abstract
Amorphous riboflavin (free base) could be produced for the first time via high energy ball milling of a commercial crystalline form (Form I). Importantly, this solid state amorphization process allowed to circumvent chemical degradation occurring during melting as well as the lack of suitable solvents, which are required for amorphization via spray- or freeze-drying. The amorphous state of riboflavin was thoroughly characterized, revealing a complex recrystallization pattern upon heating, involving two enantiotropic polymorphic forms (II and III) and a dihydrate. The glass transition temperature (Tg) and heat capacity (Cp) jump of the amorphous form were determined as 144 °C and 0.68 J/g/°C. Moreover, the relative physical stability of the different physical states has been elucidated, e.g., at room temperature: I > II > III. The following rank order was observed for the dissolution rates in water at 37 °C during the first 4 h: amorphous > III ≈ II > I. Afterwards, a dihydrate crystallized from the solutions of amorphous and metastable crystalline riboflavin forms, the solubility of which was well above the solubility of the stable FormI.
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Affiliation(s)
- C Henaff
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 UMET - Unité Matériaux et Transformations F-59000 Lille, France; Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - J Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - F Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - F Danède
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 UMET - Unité Matériaux et Transformations F-59000 Lille, France
| | - M-N Avettand-Fènoël
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 UMET - Unité Matériaux et Transformations F-59000 Lille, France
| | - J Vérin
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - A Fadel
- Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638 - IMEC - Institut Michel-Eugène Chevreul, F-59000 Lille, France
| | - J-F Willart
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 UMET - Unité Matériaux et Transformations F-59000 Lille, France.
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Salaün P, Fadel A, Pelaez-Fernandez M, Mouloud BE, Tahon JF, Volkringer C, Addad A, Woisel P, Le Fer G. Cooperative Synthesis of Raspberry-Like Covalent Organic Framework-Polymer Particles with a Radial Single-Crystal Grain Orientation. Small 2023:e2303697. [PMID: 37612799 DOI: 10.1002/smll.202303697] [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] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 07/26/2023] [Indexed: 08/25/2023]
Abstract
Despite many efforts devoted toward the design of covalent organic frameworks (COFs) at the framework level by selecting the building blocks, their organization in the nano to meso regimes is often neglected. Moreover, the importance of processability for their applications has recently emerged and the synthesis of COF nanostructures without agglomeration is still a challenge. Herein, the first example of hybrid COF-polymer particles for which polymers are used to manipulate the 2D COF growth along a specific direction is reported. The study examines how the nature, chain-end functionality, and molar mass of the polymer influence the shaping of hybrid 2D boronate ester-linked COF-polymer particles. Catechol-poly(N-butyl acrylate) leads to the self-assembly of crystallites into quasi-spherical structures while catechol-poly(N-isopropylacrylamide) mediates the synthesis of raspberry-like COF-polymer particles with radial grain orientation. Scanning and transmission electron microscopies (SEM and TEM) and 4D-STEM-ACOM (automated crystal orientation mapping) highlight the single-crystal character of these domains with one plane family throughout the particles. Interestingly, the presence of PNIPAm on the particle surface allows their drying without co-crystallization and enables their resuspension. Kinetic investigations show that catechol-PnBuA acts as a modulator and catechol-PNIPAm induces a template effect, introducing supramolecular self-assembly properties into particles to create new morphologies with higher structural complexity, beyond the framework level.
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Affiliation(s)
- Pauline Salaün
- UMR 8207 - UMET - Unité Matériaux Et Transformations, CNRS, INRAE, University of Lille, Ecole Centrale, Lille, F-59000, France
| | - Alexandre Fadel
- FR 2638 - IMEC - Institut Michel-Eugène Chevreul, CNRS, INRAE, Université d'Artois, University of Lille, F-59000, Ecole Centrale, Lille, France
| | - Mario Pelaez-Fernandez
- UMR 8207 - UMET - Unité Matériaux Et Transformations, CNRS, INRAE, University of Lille, Ecole Centrale, Lille, F-59000, France
| | - Bahae-Eddine Mouloud
- UMR 8207 - UMET - Unité Matériaux Et Transformations, CNRS, INRAE, University of Lille, Ecole Centrale, Lille, F-59000, France
| | - Jean-François Tahon
- UMR 8207 - UMET - Unité Matériaux Et Transformations, CNRS, INRAE, University of Lille, Ecole Centrale, Lille, F-59000, France
| | - Christophe Volkringer
- UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, CNRS, Univ. Artois, University of Lille, Centrale Lille, Lille, F-59000, France
| | - Ahmed Addad
- UMR 8207 - UMET - Unité Matériaux Et Transformations, CNRS, INRAE, University of Lille, Ecole Centrale, Lille, F-59000, France
| | - Patrice Woisel
- UMR 8207 - UMET - Unité Matériaux Et Transformations, CNRS, INRAE, University of Lille, Ecole Centrale, Lille, F-59000, France
| | - Gaëlle Le Fer
- UMR 8207 - UMET - Unité Matériaux Et Transformations, CNRS, INRAE, University of Lille, Ecole Centrale, Lille, F-59000, France
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5
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Inoue G, Barras A, Ma Y, Cao N, Fadel A, Roussel P, Naushad M, Szunerits S, Boukherroub R. Petroleum Coke Embedded in Cigarette Butts: All Waste-Derived Solar Evaporator for Effective Water Evaporation. ACS Appl Mater Interfaces 2023; 15:37327-37336. [PMID: 37505220 DOI: 10.1021/acsami.3c04894] [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] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Solar-driven interfacial evaporation is an eco-friendly solution for tackling the impending water scarcity the world is facing in our century. In this work, a solar-driven interfacial evaporator was prepared from cigarette butts loaded with petroleum coke powder (Filter-PetCoke), a by-product of the oil refinery processes, for the improvement of the absorption of the incident solar light. A comparison between a flat 2D and a 3D evaporator with a surface composed of orderly patterned protrusions of 2.1 cm was carried out to assess the influence of the evaporator configuration on the evaporation performance. The 3D evaporator (3D Filter-PetCoke) achieved by far the best performance (evaporation rate: 1.97 ± 0.08 kg m-2 h-1 and solar conversion efficiency: 93.2 ± 5.4%) among the prepared samples (3D Filter-PetCoke, 3D Filter, 2D Filter-PetCoke, and 2D Filter). In addition, this configuration seems to be adaptable for real and more massive operation because of the geometry of the evaporator. The high efficiency was ascribed to the good heat generation of the petroleum coke and the excellent heat management of the 3D structure of the evaporator. Moreover, this evaporator was resistant to multiple repeated usages without significant efficiency loss and capable of producing drinking water from seawater and Escherichia coli (E. coli)-contaminated water. The findings in this work indicate that this evaporator is pertinent to real situations to supply safe freshwater very efficiently from chemically/biologically contaminated water.
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Affiliation(s)
- Go Inoue
- Université de Lille, CNRS, Université Polytechnique Hauts-de-France, UMR 8520, IEMN, F-59000 Lille, France
| | - Alexandre Barras
- Université de Lille, CNRS, Université Polytechnique Hauts-de-France, UMR 8520, IEMN, F-59000 Lille, France
| | - Yunfei Ma
- School of Materials Science and Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Ning Cao
- School of Materials Science and Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Alexandre Fadel
- Université de Lille, CNRS, INRA, ENSCL, Université d'Artois, FR 2638 - IMEC -Institut Michel-Eugène Chevreul, F59000 Lille, France
| | - Pascal Roussel
- Université de Lille, CNRS, Centrale Lille, Université d'Artois, UMR 8181 - UCCS, F59000 Lille, France
| | - Mu Naushad
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, 11451 Riyadh, Saudi Arabia
| | - Sabine Szunerits
- Université de Lille, CNRS, Université Polytechnique Hauts-de-France, UMR 8520, IEMN, F-59000 Lille, France
| | - Rabah Boukherroub
- Université de Lille, CNRS, Université Polytechnique Hauts-de-France, UMR 8520, IEMN, F-59000 Lille, France
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Yammine J, Gharsallaoui A, Fadel A, Mechmechani S, Karam L, Ismail A, Chihib NE. Enhanced antimicrobial, antibiofilm and ecotoxic activities of nanoencapsulated carvacrol and thymol as compared to their free counterparts. Food Control 2023. [DOI: 10.1016/j.foodcont.2022.109317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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7
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Mechmechani S, Gharsallaoui A, El Omari K, Fadel A, Hamze M, Chihib NE. Hurdle technology based on the use of microencapsulated pepsin, trypsin and carvacrol to eradicate Pseudomonas aeruginosa and Enterococcus faecalis biofilms. Biofouling 2022; 38:903-915. [PMID: 36451605 DOI: 10.1080/08927014.2022.2151361] [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] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 11/17/2022] [Accepted: 11/19/2022] [Indexed: 06/17/2023]
Abstract
The biofilm lifestyle plays a major role in the resistance and virulence of Pseudomonas aeruginosa and Enterococcus faecalis. In this study, two microencapsulated proteases (pepsin ME-PEP and trypsin ME-TRYP) were evaluated for their biofilm dispersal activity and their synergistic effect with microencapsulated carvacrol (ME-CARV). Spray-drying was used to protect enzymes and essential oil and enhance their activities. Cell count analysis proved the synergistic activity of enzymes and carvacrol treatment as biofilms were further reduced after combined treatment in comparison to ME-CARV or enzymes alone. Furthermore, results showed that sequential treatment in the order ME-TRYP - ME-PEP - ME-CARV resulted in more efficient biofilm removal with a maximum reduction of 5 log CFU mL-1 for P. aeruginosa and 4 log CFU mL-1 for E. faecalis. This study proposes that the combination of microencapsulated proteases with ME-CARV could be useful for the effective control of P. aeruginosa and E. faecalis biofilms.
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Affiliation(s)
- Samah Mechmechani
- CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Univ. Lille, Lille, France
- Laboratoire Microbiologie Santé et Environnement (LMSE), Doctoral School of Sciences and Technology, Faculty of Public Health, Lebanese University, Tripoli, Lebanon
| | - Adem Gharsallaoui
- Université Claude Bernard Lyon 1, CNRS, LAGEPP UMR 5007, Univ Lyon, Villeurbanne, France
| | - Khaled El Omari
- Laboratoire Microbiologie Santé et Environnement (LMSE), Doctoral School of Sciences and Technology, Faculty of Public Health, Lebanese University, Tripoli, Lebanon
- Quality Control Center Laboratories at the Chamber of Commerce, Industry & Agriculture of Tripoli & North Lebanon, Tripoli, Lebanon
| | - Alexandre Fadel
- CNRS, INRAE, Centrale Lille, Université d'Artois, FR 2638 - IMEC -Institut Michel-Eugene Chevreul, Univ Lille, Lille, France
| | - Monzer Hamze
- Laboratoire Microbiologie Santé et Environnement (LMSE), Doctoral School of Sciences and Technology, Faculty of Public Health, Lebanese University, Tripoli, Lebanon
| | - Nour-Eddine Chihib
- CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Univ. Lille, Lille, France
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8
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Coutant M, Lepot K, Fadel A, Addad A, Richard E, Troadec D, Ventalon S, Sugitani K, Javaux EJ. Distinguishing cellular from abiotic spheroidal microstructures in the ca. 3.4 Ga Strelley Pool Formation. Geobiology 2022; 20:599-622. [PMID: 35712885 DOI: 10.1111/gbi.12506] [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] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 05/04/2022] [Accepted: 05/20/2022] [Indexed: 06/15/2023]
Abstract
The morphogenesis of most carbonaceous microstructures that resemble microfossils in Archean (4-2.5 Ga old) rocks remains debated. The associated carbonaceous matter may even-in some cases-derive from abiotic organic molecules. Mineral growths associated with organic matter migration may mimic microbial cells, some anatomical features, and known microfossils-in particular those with simple spheroid shapes. Here, spheroid microstructures from a chert of the ca. 3.4 Ga Strelley Pool Formation (SPF) of the Pilbara Craton (Western Australia) were imaged and analyzed with a combination of high-resolution in situ techniques. This provides new insights into carbonaceous matter distributions and their relationships with the crystallographic textures of associated quartz. Thus, we describe five new types of spheroids and discuss their morphogenesis. In at least three types of microstructures, wall coalescence argues for migration of carbonaceous matter onto abiotic siliceous spherulites or diffusion in poorly crystalline silica. The nanoparticulate walls of these coalescent structures often cut across multiple quartz crystals, consistent with migration in/on silica prior to quartz recrystallization. Sub-continuous walls lying at quartz boundaries occur in some coalescent vesicles. This weakens the "continuous carbonaceous wall" criterion proposed to support cellular inferences. In contrast, some clustered spheroids display wrinkled sub-continuous double walls, and a large sphere shows a thick sub-continuous wall with pustules and depressions. These features appear consistent with post-mortem cell alteration, although abiotic morphogenesis remains difficult to rule out. We compared these siliceous and carbonaceous microstructures to coalescent pyritic spheroids from the same sample, which likely formed as "colloidal" structures in hydrothermal context. The pyrites display a smaller size and only limited carbonaceous coatings, arguing that they could not have acted as precursors to siliceous spheroids. This study revealed new textural features arguing for abiotic morphogenesis of some Archean spheroids. The absence of these features in distinct types of spheroids leaves open the microfossil hypothesis in the same rock. Distinction of such characteristics could help addressing further the origin of other candidate microfossils. This study calls for similar investigations of metamorphosed microfossiliferous rocks and of the products of in vitro growth of cell-mimicking structures in presence of organics and silica.
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Affiliation(s)
- Maxime Coutant
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG - Laboratoire d'Océanologie et de Géosciences, Lille, France
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium
| | - Kevin Lepot
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG - Laboratoire d'Océanologie et de Géosciences, Lille, France
- Institut Universitaire de France (IUF), France
| | - Alexandre Fadel
- UMR 8207 - UMET - Unité Matériaux et Transformations, Univ. Lille, CNRS, INRAE, Centrale Lille, Lille, France
| | - Ahmed Addad
- UMR 8207 - UMET - Unité Matériaux et Transformations, Univ. Lille, CNRS, INRAE, Centrale Lille, Lille, France
| | - Elodie Richard
- Univ. Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, US 41 - UAR 2014 - PLBS, Lille, France
| | - David Troadec
- Univ. Lille, CNRS, Centrale Lille, Junia, Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN - Institut d'Electronique de Microélectronique et de Nanotechnologie, Lille, France
| | - Sandra Ventalon
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG - Laboratoire d'Océanologie et de Géosciences, Lille, France
| | - Kenichiro Sugitani
- Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
| | - Emmanuelle J Javaux
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium
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Mechmechani S, Gharsallaoui A, Fadel A, El Omari K, Khelissa S, Hamze M, Chihib NE. Microencapsulation of carvacrol as an efficient tool to fight Pseudomonas aeruginosa and Enterococcus faecalis biofilms. PLoS One 2022; 17:e0270200. [PMID: 35776742 PMCID: PMC9249205 DOI: 10.1371/journal.pone.0270200] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 06/06/2022] [Indexed: 12/31/2022] Open
Abstract
Biofilms are involved in serious problems in medical and food sectors due to their contribution to numerous severe chronic infections and foodborne diseases. The high resistance of biofilms to antimicrobial agents makes their removal as a big challenge. In this study, spray-drying was used to develop microcapsules containing carvacrol, a natural antimicrobial agent, to enhance its activity against P. aeruginosa and E. faecalis biofilms. The physicochemical properties and microscopic morphology of the realized capsules and cells were characterized. The minimum inhibitory concentration of encapsulated carvacrol (E-CARV) (1.25 mg mL-1) was 4-times lower than that of free carvacrol (F-CARV) (5 mg mL-1) against P. aeruginosa, while it remained the same against E. faecalis (0.625 mg mL-1). E-CARV was able to reduce biofilm below the detection limit for P. aeruginosa and by 5.5 log CFU ml-1 for E. faecalis after 15 min of treatment. Results also showed that F-CARV and E-CARV destabilize the bacterial cell membrane leading to cell death. These results indicate that carvacrol exhibited a strong antimicrobial effect against both bacterial biofilms. In addition, spray-drying could be used as an effective tool to enhance the antibiofilm activity of carvacrol, while reducing the concentrations required for disinfection of abiotic surfaces.
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Affiliation(s)
- Samah Mechmechani
- University Lille, CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Lille, France
- Laboratoire Microbiologie Santé et Environnement (LMSE), Faculty of Public Health, Doctoral School of Sciences and Technology, Lebanese University, Tripoli, Lebanon
| | - Adem Gharsallaoui
- University Lyon, Université Claude Bernard Lyon 1, CNRS, LAGEPP UMR 5007, Villeurbanne, France
| | - Alexandre Fadel
- University Lille, CNRS, INRAE, Centrale Lille, Université d’Artois, FR 2638 –IMEC -Institut Michel-Eugene Chevreul, Lille, France
| | - Khaled El Omari
- Laboratoire Microbiologie Santé et Environnement (LMSE), Faculty of Public Health, Doctoral School of Sciences and Technology, Lebanese University, Tripoli, Lebanon
- Quality Control Center Laboratories at the Chamber of Commerce, Industry & Agriculture of Tripoli & North Lebanon, Tripoli, Lebanon
| | - Simon Khelissa
- University Lille, CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Lille, France
| | - Monzer Hamze
- Laboratoire Microbiologie Santé et Environnement (LMSE), Faculty of Public Health, Doctoral School of Sciences and Technology, Lebanese University, Tripoli, Lebanon
| | - Nour-Eddine Chihib
- University Lille, CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Lille, France
- * E-mail:
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10
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Sforna MC, Loron CC, Demoulin CF, François C, Cornet Y, Lara YJ, Grolimund D, Ferreira Sanchez D, Medjoubi K, Somogyi A, Addad A, Fadel A, Compère P, Baudet D, Brocks JJ, Javaux EJ. Intracellular bound chlorophyll residues identify 1 Gyr-old fossils as eukaryotic algae. Nat Commun 2022; 13:146. [PMID: 35013306 PMCID: PMC8748435 DOI: 10.1038/s41467-021-27810-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [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: 05/21/2021] [Accepted: 12/03/2021] [Indexed: 11/09/2022] Open
Abstract
The acquisition of photosynthesis is a fundamental step in the evolution of eukaryotes. However, few phototrophic organisms are unambiguously recognized in the Precambrian record. The in situ detection of metabolic byproducts in individual microfossils is the key for the direct identification of their metabolisms. Here, we report a new integrative methodology using synchrotron-based X-ray fluorescence and absorption. We evidence bound nickel-geoporphyrins moieties in low-grade metamorphic rocks, preserved in situ within cells of a ~1 Gyr-old multicellular eukaryote, Arctacellularia tetragonala. We identify these moieties as chlorophyll derivatives, indicating that A. tetragonala was a phototrophic eukaryote, one of the first unambiguous algae. This new approach, applicable to overmature rocks, creates a strong new proxy to understand the evolution of phototrophy and diversification of early ecosystems.
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Affiliation(s)
- Marie Catherine Sforna
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium.
| | - Corentin C Loron
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium
| | - Catherine F Demoulin
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium
| | - Camille François
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium.,Commission for the Geological Map of the World, Paris, France
| | - Yohan Cornet
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium
| | - Yannick J Lara
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium
| | - Daniel Grolimund
- Paul Scherrer Institut, Swiss Light Source, CH-5232, Villigen PSI, Switzerland
| | | | | | | | - Ahmed Addad
- Unité Matériaux et Transformations (UMR CNRS 8207), Université Lille 1 - Sciences et Technologies, Villeneuve d'Ascq, France
| | - Alexandre Fadel
- Unité Matériaux et Transformations (UMR CNRS 8207), Université Lille 1 - Sciences et Technologies, Villeneuve d'Ascq, France
| | - Philippe Compère
- Functional and Evolutive Morphology, Department of Biology, Ecology and Evolution, UR FOCUS, and Center for Applied Research and Education in Microscopy (CAREM-ULiege), University of Liège, Liège, Belgium
| | - Daniel Baudet
- Geodynamics & Mineral Resources Service, Royal Museum for Central Africa, Tervuren, Belgium
| | - Jochen J Brocks
- Research School of Earth Sciences, The Australian National University, Canberra ACT, Australia
| | - Emmanuelle J Javaux
- Early Life Traces & Evolution-Astrobiology, UR Astrobiology, University of Liège, Liège, Belgium.
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11
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Khelissa S, Gharsallaoui A, Fadel A, Barras A, Jama C, Jbilou F, Chihib NE. Microencapsulation of benzalkonium chloride enhanced its antibacterial and antibiofilm activities against Listeria monocytogenes and Escherichia coli. J Appl Microbiol 2021; 131:1136-1146. [PMID: 33484234 DOI: 10.1111/jam.15010] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 01/11/2021] [Accepted: 01/18/2021] [Indexed: 11/26/2022]
Abstract
AIMS In this study, benzalkonium chloride (BAC) microcapsules were developed for surface disinfection purpose and were evaluated against Listeria monocytogenes and Escherichia coli biofilms. METHODS AND RESULTS Microcapsules were prepared with two different strategies: uncomplexed BAC-microcapsules (UBM) containing BAC and maltodextrins, and complexed BAC-microcapsules (CBM) containing BAC complexed by pectin and maltodextrins. The minimum inhibitory concentrations (MICs) of free and microencapsulated BAC were investigated against two food pathogens: L. monocytogenes and E. coli. The antibiofilm activities of UBM and CBM against L. monocytogenes and E. coli biofilms formed on stainless steel at 37°C were evaluated and compared to BAC used under its free form. MICs of encapsulated BAC were up to fourfold lower than those of free BAC. The UBM and CBM showed higher antibiofilm effect when compared to the free BAC. CONCLUSIONS Overall, results demonstrated that microencapsulation enhanced the antibacterial activity of BAC against L. monocytogenes and E. coli biofilms. SIGNIFICANCE AND IMPACT OF THE STUDY The application of such BAC microcapsule-based delivery systems can improve surface disinfection procedures and reduce the required BAC concentrations and the related cytotoxicity of this antimicrobial compound.
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Affiliation(s)
- S Khelissa
- Univ Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Lille, France
| | - A Gharsallaoui
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, LAGEPP UMR 5007, Villeurbanne, France
| | - A Fadel
- Univ Lille, CNRS, INRAE, Centrale Lille, Université d'Artois, FR 2638 - IMEC -Institut Michel-Eugène Chevreul, Lille, France
| | - A Barras
- Univ Lille, CNRS, Centrale Lille Univ. Polytechnique Hauts-de-France, UMR 8520-IEMN, Lille, France
| | - C Jama
- Univ Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Lille, France
| | | | - N-E Chihib
- Univ Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Lille, France
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12
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Fadel A, Lepot K, Nuns N, Regnier S, Riboulleau A. New preparation techniques for molecular and in-situ analysis of ancient organic micro- and nanostructures. Geobiology 2020; 18:445-461. [PMID: 32162473 DOI: 10.1111/gbi.12380] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 01/18/2020] [Accepted: 01/22/2020] [Indexed: 05/26/2023]
Abstract
Organic microfossils preserved in three dimensions in transparent mineral matrices such as cherts/quartzites, phosphates, or carbonates are best studied in petrographic thin sections. Moreover, microscale mass spectrometry techniques commonly require flat, polished surfaces to minimize analytical bias. However, contamination by epoxy resin in traditional petrographic sections is problematic for the geochemical study of the kerogen in these microfossils and more generally for the in situ analysis of fossil organic matter. Here, we show that epoxy contamination has a molecular signature that is difficult to distinguish from kerogen with time-of-flight secondary ion mass spectrometry (ToF-SIMS). This contamination appears pervasive in organic microstructures embedded in micro- to nano-crystalline carbonate. To solve this problem, a new semi-thin section preparation protocol without resin medium was developed for micro- to nanoscale in situ investigation of insoluble organic matter. We show that these sections are suited for microscopic observation of Proterozoic microfossils in cherts. ToF-SIMS reveals that these sections are free of pollution after final removal of a <10 nm layer of contamination using low-dose ion sputtering. ToF-SIMS maps of fragments from aliphatic and aromatic molecules and organic sulfur are correlated with the spatial distribution of organic microlaminae in a Jurassic stromatolite. Hydrocarbon-derived ions also appeared correlated with kerogenous microstructures in Archean cherts. These developments in analytical procedures should help future investigations of organic matter and in particular, microfossils, by allowing the spatial correlation of microscopy, spectroscopy, precise isotopic microanalyses, and novel molecular microanalyses such as ToF-SIMS.
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Affiliation(s)
- Alexandre Fadel
- UMR 8187, Laboratoire d'Océanologie et de Géosciences, Université de Lille, CNRS, Université Littoral Côte d'Opale, Lille, France
| | - Kevin Lepot
- UMR 8187, Laboratoire d'Océanologie et de Géosciences, Université de Lille, CNRS, Université Littoral Côte d'Opale, Lille, France
| | - Nicolas Nuns
- FR 2638 - IMEC -Institut Michel-Eugène Chevreul, Université de Lille, CNRS, INRA, Centrale Lille, ENSCL, Université d'Artois, Lille, France
| | - Sylvie Regnier
- UMR8198, Evolution, Ecologie et Paléontologie, CNRS, Université de Lille, Lille, France
| | - Armelle Riboulleau
- UMR 8187, Laboratoire d'Océanologie et de Géosciences, Université de Lille, CNRS, Université Littoral Côte d'Opale, Lille, France
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13
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Woldemichael AK, Alwan F, Hassen A, Kazibwe F, Fadel A. P6.023 Cross - Border HIV & AIDS Intervention Programme in Seven East African Countries (2008 – 2012). Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.1177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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14
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Bdeir, Abolfotouh, Mukhtar A, Omer H, Ali D, Khateeb MA, Tayyeb AE, Fadel A, Farah I, Odeh R, Rabai R, Tayiem, Al Dossari H. SHA 058. Predictors of in-hospital mortality in patients with heart failure at King Abdulaziz Medical City Cardiac Center – Riyadh, Saudi Arabia. J Saudi Heart Assoc 2011. [DOI: 10.1016/j.jsha.2011.02.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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15
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Wallqvist A, Fukunishi Y, Murphy LR, Fadel A, Levy RM. Iterative sequence/secondary structure search for protein homologs: comparison with amino acid sequence alignments and application to fold recognition in genome databases. Bioinformatics 2000; 16:988-1002. [PMID: 11159310 DOI: 10.1093/bioinformatics/16.11.988] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
MOTIVATION Sequence alignment techniques have been developed into extremely powerful tools for identifying the folding families and function of proteins in newly sequenced genomes. For a sufficiently low sequence identity it is necessary to incorporate additional structural information to positively detect homologous proteins. We have carried out an extensive analysis of the effectiveness of incorporating secondary structure information directly into the alignments for fold recognition and identification of distant protein homologs. A secondary structure similarity matrix based on a database of three-dimensionally aligned proteins was first constructed. An iterative application of dynamic programming was used which incorporates linear combinations of amino acid and secondary structure sequence similarity scores. Initially, only primary sequence information is used. Subsequently contributions from secondary structure are phased in and new homologous proteins are positively identified if their scores are consistent with the predetermined error rate. RESULTS We used the SCOP40 database, where only PDB sequences that have 40% homology or less are included, to calibrate homology detection by the combined amino acid and secondary structure sequence alignments. Combining predicted secondary structure with sequence information results in a 8-15% increase in homology detection within SCOP40 relative to the pairwise alignments using only amino acid sequence data at an error rate of 0.01 errors per query; a 35% increase is observed when the actual secondary structure sequences are used. Incorporating predicted secondary structure information in the analysis of six small genomes yields an improvement in the homology detection of approximately 20% over SSEARCH pairwise alignments, but no improvement in the total number of homologs detected over PSI-BLAST, at an error rate of 0.01 errors per query. However, because the pairwise alignments based on combinations of amino acid and secondary structure similarity are different from those produced by PSI-BLAST and the error rates can be calibrated, it is possible to combine the results of both searches. An additional 25% relative improvement in the number of genes identified at an error rate of 0.01 is observed when the data is pooled in this way. Similarly for the SCOP40 dataset, PSI-BLAST detected 15% of all possible homologs, whereas the pooled results increased the total number of homologs detected to 19%. These results are compared with recent reports of homology detection using sequence profiling methods. AVAILABILITY Secondary structure alignment homepage at http://lutece.rutgers.edu/ssas CONTACT anders@rutchem.rutgers.edu; ronlevy@lutece.rutgers.edu SUPPLEMENTARY INFORMATION Genome sequence/structure alignment results at http://lutece.rutgers.edu/ss_fold_predictions.
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Affiliation(s)
- A Wallqvist
- Department of Chemistry, Rutgers University, Wright-Rieman Laboratories, 610 Taylor Rd, Piscataway, NJ 08854-8087, USA.
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16
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Gervois P, Chopin-Delannoy S, Fadel A, Dubois G, Kosykh V, Fruchart JC, Najïb J, Laudet V, Staels B. Fibrates increase human REV-ERBalpha expression in liver via a novel peroxisome proliferator-activated receptor response element. Mol Endocrinol 1999; 13:400-9. [PMID: 10076997 DOI: 10.1210/mend.13.3.0248] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Fibrates are widely used hypolipidemic drugs that act by modulating the expression of genes involved in lipid and lipoprotein metabolism. Whereas the activation of gene transcription by fibrates occurs via the nuclear receptor peroxisome proliferator-activated receptor-alpha (PPARalpha) interacting with response elements consisting of a direct repeat of the AGGTCA motif spaced by one nucleotide (DR1), the mechanisms of negative gene regulation by fibrates and PPARalpha are largely unknown. In the present study, we demonstrate that fibrates induce the expression of the nuclear receptor Rev-erbalpha, a negative regulator of gene transcription. Fibrates increase Rev-erbalpha mRNA levels both in primary human hepatocytes and in HepG2 hepatoblastoma cells. In HepG2 cells, fibrates furthermore induce Rev-erbalpha protein synthesis rates. Transfection studies with reporter constructs driven by the human Rev-erbalpha promoter revealed that fibrates induce Rev-erbalpha expression at the transcriptional level via PPARalpha. Site-directed mutagenesis experiments identified a PPAR response element that coincides with the previously identified Rev-erbalpha negative autoregulatory Rev-DR2 element. Electromobility shift assay experiments indicated that PPARalpha binds as heterodimer with 9-cis-retinoic acid receptor to a subset of DR2 elements 5' flanked by an A/T-rich sequence such as in the Rev-DR2. PPARalpha and Rev-erbalpha bind with similar affinities to the Rev-DR2 site. In conclusion, these data demonstrate human Rev-erbalpha as a PPARalpha target gene and identify a subset of DR2 sites as novel PPARalpha response elements. Finally, the PPARalpha and Rev-erbalpha signaling pathways cross-talk through competition for binding to those response elements.
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Affiliation(s)
- P Gervois
- U.325 INSERM, Département d'Athérosclérose, Institut Pasteur de Lille and The Faculté de Pharmacie, Université de Lille II, France
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17
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Staels B, Koenig W, Habib A, Merval R, Lebret M, Torra IP, Delerive P, Fadel A, Chinetti G, Fruchart JC, Najib J, Maclouf J, Tedgui A. Activation of human aortic smooth-muscle cells is inhibited by PPARalpha but not by PPARgamma activators. Nature 1998; 393:790-3. [PMID: 9655393 DOI: 10.1038/31701] [Citation(s) in RCA: 868] [Impact Index Per Article: 33.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Peroxisome proliferator-activated receptors (PPARs) are key players in lipid and glucose metabolism and are implicated in metabolic disorders predisposing to atherosclerosis, such as dyslipidaemia and diabetes. Whereas PPARgamma promotes lipid storage by regulating adipocyte differentiation, PPARalpha stimulates the beta-oxidative degradation of fatty acids. PPARalpha-deficient mice show a prolonged response to inflammatory stimuli, suggesting that PPARalpha is also a modulator of inflammation. Hypolipidaemic fibrate drugs are PPARalpha ligands that inhibit the progressive formation of atherosclerotic lesions, which involves chronic inflammatory processes, even in the absence of their atherogenic lipoprotein-lowering effect. Here we show that PPARalpha is expressed in human aortic smooth-muscle cells, which participate in plaque formation and post-angioplasty re-stenosis. In these smooth-muscle cells, we find that PPARalpha ligands, and not PPARgamma ligands, inhibit interleukin-1-induced production of interleukin-6 and prostaglandin and expression of cyclooxygenase-2. This inhibition of cyclooxygenase-2 induction occurs transcriptionally as a result of PPARalpha repression of NF-kappaB signalling. In hyperlipidaemic patients, fenofibrate treatment decreases the plasma concentrations of interleukin-6, fibrinogen and C-reactive protein. We conclude that activators of PPARalpha inhibit the inflammatory response of aortic smooth-muscle cells and decrease the concentration of plasma acute-phase proteins, indicating that PPARalpha in the vascular wall may influence the process of atherosclerosis and re-stenosis.
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MESH Headings
- Acute-Phase Proteins/metabolism
- Animals
- Anti-Inflammatory Agents/pharmacology
- Aorta/cytology
- Aorta/drug effects
- Aorta/enzymology
- Aorta/pathology
- COS Cells
- Coronary Disease/blood
- Cyclooxygenase 2
- Cyclooxygenase 2 Inhibitors
- Cyclooxygenase Inhibitors/pharmacology
- Fenofibrate/pharmacology
- Gemfibrozil/pharmacology
- Gene Expression Regulation, Enzymologic
- Humans
- Hyperlipidemias/blood
- Hypolipidemic Agents/pharmacology
- Inflammation/enzymology
- Inflammation/metabolism
- Interleukin-1/metabolism
- Interleukin-6/biosynthesis
- Isoenzymes/biosynthesis
- Isoenzymes/genetics
- Membrane Proteins
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/pathology
- Muscle, Smooth, Vascular/physiology
- NF-kappa B/metabolism
- Prostaglandin-Endoperoxide Synthases/biosynthesis
- Prostaglandin-Endoperoxide Synthases/genetics
- Prostaglandins/biosynthesis
- Pyrimidines/pharmacology
- Receptors, Cytoplasmic and Nuclear/biosynthesis
- Receptors, Cytoplasmic and Nuclear/chemistry
- Receptors, Cytoplasmic and Nuclear/physiology
- Rosiglitazone
- Thiazoles/pharmacology
- Thiazolidinediones
- Transcription Factors/biosynthesis
- Transcription Factors/chemistry
- Transcription Factors/physiology
- Transcription, Genetic
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Affiliation(s)
- B Staels
- U325 INSERM, Département d'Athérosclérose, Institut Pasteur, Lille, France.
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Boucard V, Dumas P, Sigwalt P, Guérin P, Fadel A. Living stereospecific and enantioasymmetric polymerization of methylthiirane initiated by various bis(alkyl-S-cysteinato)cadmium. Eur Polym J 1996. [DOI: 10.1016/0014-3057(95)00155-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
Diallyl sulfide, a major flavor ingredient from garlic, was previously shown to inhibit chemically induced carcinogenesis and cytotoxicity in animal model systems. It modulated cytochrome P-450 compositions by inactivating P-450 2E1 and inducing P-450 2B1. The present studies examined the inhibition of P-450 2E1 mediated p-nitrophenol hydroxylase activity by diallyl sulfide and its putative metabolites diallyl sulfoxide and diallyl sulfone (DASO2). Each compound displayed competitive inhibition of p-nitrophenol hydroxylase activity in incubations using liver microsomes from acetone-pretreated male Sprague-Dawley rats. Preincubation of the microsomes with DASO2 inactivated p-nitrophenol hydroxylase activity in a process that was time- and NADPH-dependent and saturable, exhibited pseudo-first-order kinetics, was protected by alternate substrate, was accompanied by a loss of microsomal P-450-CO binding spectrum, and was unaffected by exogenous nucleophile. The Ki value for DASO2 was 188 microM and the maximal rate of inactivation was 0.32 min-1. DASO2 was ineffective in the inactivation of ethoxyresorufin dealkylase, pentoxyresorufin dealkylase, or benzphetamine demethylase activity. Purified P-450 2E1 in a reconstituted system was inactivated in a time- and NADPH-dependent manner by DASO2. The metabolic conversion of diallyl sulfide to the sulfoxide and sulfone was observed in vivo and in vitro. The results suggest that diallyl sulfide inhibits the metabolism of P-450 2E1 substrates by competitive inhibition mechanisms and by inactivating P-450 2E1 via a suicide-inhibitory action of DASO2.
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Affiliation(s)
- J F Brady
- Laboratory for Cancer Research, College of Pharmacy, Rutgers University, Piscataway, New Jersey 08855
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20
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Yang CS, Ishizaki H, Lee MJ, Wade D, Fadel A. Deuterium isotope effect in the interaction of N-nitrosodimethylamine, ethanol, and related compounds with cytochrome P-450IIE1. Chem Res Toxicol 1991; 4:408-13. [PMID: 1912326 DOI: 10.1021/tx00022a002] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Deuteration of N-nitrosodimethylamine (NDMA) decreases its carcinogenicity and produces an isotope effect on its metabolism. Our previous results showed that deuteration causes a 5-fold increase in the apparent Km, but not the Vmax, for the demethylation and denitrosation of NDMA in microsomes. In the present work, we studied the nature of this deuterium isotope effect with several compounds using acetone-induced microsomes as a source of cytochrome P-450IIE1. In the microsomal N-nitrosodiethylamine deethylase reaction, NDMA and [2H6]NDMA were competitive inhibitors and displayed apparent Ki values of 59 and 441 mM, respectively, showing an isotope effect of 0.13. Similarly, in the p-nitrophenol hydroxylase reaction, a deuterium isotope effect of 0.21 on the Ki was observed. With acetone as an inhibitor for p-nitrophenol hydroxylase, the isotope effect on the Ki was 0.11. Similar deuterium isotope effects were also observed with acetone and dimethylformamide as competitive inhibitors for NDMA demethylase. When the oxidation of ethanol, [1,1-2H2]ethanol, [2,2,2-2H3]ethanol, and [2H6]ethanol was compared, an isotope effect of about 5 was found in the Vmax/Km due to the deuteration of the methylene group (carbon 1) but not due to the methyl group. However, the Vmax was not affected. A corresponding deuterium isotope effect was observed in the Ki when these compounds were used as competitive inhibitors for the NDMA demethylase reaction. The results demonstrate that deuteration of NDMA, ethanol, and related compounds results in an increase in the Km or Ki with little change in the Vmax of P-450IIE1-catalyzed reactions. The molecular basis of this isotope effect is discussed.
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Affiliation(s)
- C S Yang
- Department of Chemical Biology and Pharmacognosy, College of Pharmacy, Rutgers University, Piscataway, New Jersey 08855-0789
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Fadel A, Salaun J. Anhydrous ferric chloride dispersed on silica gel induced ring enlargement of tertiary cycloalkanols. II : a convenient homologation of cycloalkanones, preparation of spiro systems and propella -γ-lactones. Tetrahedron 1985. [DOI: 10.1016/s0040-4020(01)96528-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Salaün J, Fadel A, Conia J. Ring enlargement of 1-hydroxycylopropyl carbinol derivatives induced by lithium chloride. A convenient synthesis of 2-alkynylcyclobutanones. Tetrahedron Lett 1979. [DOI: 10.1016/s0040-4039(01)86169-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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