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Cao X, Padoan S, Binder S, Bauer S, Orasche J, Rus CM, Mudan A, Huber A, Kuhn E, Oeder S, Lintelmann J, Adam T, Di Bucchianico S, Zimmermann R. A comparative study of persistent DNA oxidation and chromosomal instability induced in vitro by oxidizers and reference airborne particles. Mutat Res Genet Toxicol Environ Mutagen 2022; 874-875:503446. [PMID: 35151426 DOI: 10.1016/j.mrgentox.2022.503446] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 09/20/2021] [Revised: 11/29/2021] [Accepted: 01/10/2022] [Indexed: 06/14/2023]
Abstract
Adverse health effects driven by airborne particulate matter (PM) are mainly associated with reactive oxygen species formation, pro-inflammatory effects, and genome instability. Therefore, a better understanding of the underlying mechanisms is needed to evaluate health risks caused by exposure to PM. The aim of this study was to compare the genotoxic effects of two oxidizing agents (menadione and 3-chloro-1,2-propanediol) with three different reference PM (fine dust ERM-CZ100, urban dust SRM1649, and diesel PM SRM2975) on monocytic THP-1 and alveolar epithelial A549 cells. We assessed DNA oxidation by measuring the oxidized derivative 8-hydroxy-2'-deoxyguanosine (8-OHdG) following short and long exposure times to evaluate the persistency of oxidative DNA damage. Cytokinesis-block micronucleus cytome assay was performed to assess chromosomal instability, cytostasis, and cytotoxicity. Particles were characterized by inductively coupled plasma mass spectrometry in terms of selected elemental content, the release of ions in cell medium and the cellular uptake of metals. PM deposition and cellular dose were investigated by a spectrophotometric method on adherent A549 cells. The level of lipid peroxidation was evaluated via malondialdehyde concentration measurement. Despite differences in the tested concentrations, deposition efficiency, and lipid peroxidation levels, all reference PM samples caused oxidative DNA damage to a similar extent as the two oxidizers in terms of magnitude but with different oxidative DNA damage persistence. Diesel SRM2975 were more effective in inducing chromosomal instability with respect to fine and urban dust highlighting the role of polycyclic aromatic hydrocarbons derivatives on chromosomal instability. The persistence of 8-OHdG lesions strongly correlated with different types of chromosomal damage and revealed distinguishing sensitivity of cell types as well as specific features of particles versus oxidizing agent effects. In conclusion, this study revealed that an interplay between DNA oxidation persistence and chromosomal damage is driving particulate matter-induced genome instability.
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Affiliation(s)
- Xin Cao
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany; Joint Mass Spectrometry Center at Analytical Chemistry, Institute of Chemistry, University of Rostock, Rostock, Germany
| | - Sara Padoan
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany; Institute of Chemistry and Environmental Engineering, University of the Bundeswehr Munich, Neubiberg, Germany
| | - Stephanie Binder
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany; Joint Mass Spectrometry Center at Analytical Chemistry, Institute of Chemistry, University of Rostock, Rostock, Germany
| | - Stefanie Bauer
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Jürgen Orasche
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Corina-Marcela Rus
- Joint Mass Spectrometry Center at Analytical Chemistry, Institute of Chemistry, University of Rostock, Rostock, Germany; Centogene GmbH, Rostock, Germany
| | - Ajit Mudan
- Institute of Chemistry and Environmental Engineering, University of the Bundeswehr Munich, Neubiberg, Germany
| | - Anja Huber
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Evelyn Kuhn
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Sebastian Oeder
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Jutta Lintelmann
- Research Unit of Molecular Endocrinology and Metabolism, Helmholtz Zentrum München, Neuherberg, Germany
| | - Thomas Adam
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany; Institute of Chemistry and Environmental Engineering, University of the Bundeswehr Munich, Neubiberg, Germany
| | - Sebastiano Di Bucchianico
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany.
| | - Ralf Zimmermann
- Joint Mass Spectrometry Center, Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany; Joint Mass Spectrometry Center at Analytical Chemistry, Institute of Chemistry, University of Rostock, Rostock, Germany
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Sin JH, Ipe DS, Hamlet S, Walsh LJ, Love RM, George R. Fluorescence characteristics of E. faecalis in dentine following treatment with oxidizing endodontic irrigants. Photodiagnosis Photodyn Ther 2021; 35:102344. [PMID: 34033937 DOI: 10.1016/j.pdpdt.2021.102344] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 04/08/2021] [Accepted: 05/17/2021] [Indexed: 11/21/2022]
Abstract
INTRODUCTION This study aimed to assess changes in the fluorescence characteristics of Enterococcus faecalis in human dentine over a period of 24 h following treatment with endodontic irrigants. METHOD Sterilised, non-functional extracted third molars were embedded in acrylic resin and uniformly sectioned into 2 mm thick dentine sections. After the removal of smear layer, the dentine sections were inoculated with E. faecalis and cultured for 7 days. The infected dentine sections were subsequently treated with different concentrations of sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2). Bacterial fluorescence readings were assessed at different time points using a calibrated laser device. All data were assessed for normality (Kolmogorov Smirnoff test) and analysed using ANOVA with Bonferroni post-hoc tests. RESULTS Fluorescence readings were quenched when E. faecalis infected human dentine sections were treated with oxidizing irrigants in vitro. Throughout a 24-hour period, fluorescence recovered in part but did not return to baseline level. CONCLUSION The fluorescence quenching effect of these oxidizing agents needs to be considered when using laser fluorescence in assessing the quality of root canal debridement or disinfection.
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More NS, Gogate PR. Intensified approach for desulfurization of simulated fuel containing thiophene based on ultrasonic flow cell and oxidizing agents. Ultrason Sonochem 2019; 51:58-68. [PMID: 30514486 DOI: 10.1016/j.ultsonch.2018.10.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 09/27/2018] [Accepted: 10/12/2018] [Indexed: 06/09/2023]
Abstract
Intensified desulfurization of simulated crude fuel containing thiophene has been investigated using ultrasonic flow cell in combination with oxidizing agents such as peracetic acid, hydrogen peroxide (H2O2) and Fenton reagent at ambient conditions. The effect of thiophene loading, recirculation flow rate and the oxidant loading on the extent of desulfurization has been studied at 1 L capacity. Combination of ultrasound and hydrogen peroxide at optimized loading of 8% resulted in higher extent of desulfurization (38%) as compared to only ultrasound (17%). Higher degree of enhancement in extent of desulfurization (57% as the actual value) was observed for combination of ultrasound and peracetic acid at loading of 10%. Significant increase in extent of desulfurization was obtained for the combination of ultrasound and Fenton reagent (2 g/L FeSO4 + 10% H2O2) with actual extent being 87%. The conventional approaches of only hydrogen peroxide and only Fenton without ultrasound resulted in much lower extent of desulfurization as 22 and 40% respectively confirming the synergism for the combined process involving ultrasound. Maximum desulfurization extent as 96% was obtained for the approach of ultrasound combined with Fenton reagent at 2 g/L of FeSO4 and 15% H2O2 addition in three stages and 80 min of treatment time. The analysis of treated samples using HPLC spectra revealed that no other by-products or unwanted chemical species were formed during the treatment. The process intensification benefits have been clearly established in terms of much higher extent of desulfurization for combined approaches with the final sulfur content below minimum limit (5 ppm) whereas most of the conventional desulfurization approaches (without ultrasound) resulted in sulfur retention up to 10 ppm in final treated fuel.
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Affiliation(s)
- Nishant S More
- Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400 019, India
| | - Parag R Gogate
- Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400 019, India.
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Hoogenkamp MA, Crielaard W, Krom BP. Uses and limitations of green fluorescent protein as a viability marker in Enterococcus faecalis: An observational investigation. J Microbiol Methods 2015; 115:57-63. [PMID: 26015063 DOI: 10.1016/j.mimet.2015.05.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 05/22/2015] [Accepted: 05/22/2015] [Indexed: 01/12/2023]
Abstract
Enterococci are capable of producing biofilms that are notoriously difficult to treat and remove, for instance in root canal infections. The tenacious nature of these organisms makes screening of known and novel antimicrobial compounds necessary. While traditionally growth and fluorescence-based screening methods have proven useful, these methods have their limitations when applied to enterococci (e.g. time consuming, no kinetic data, diffusion properties of the fluorescent dyes). The aim of this study was to develop and validate a GFP-based high-throughput screening system to assess the bactericidal activity of a broad range of antimicrobial agents on Enterococcus faecalis and its biofilms. The effect of antimicrobial compounds on cell viability and GFP fluorescence of enterococcal planktonic and biofilm cells was determined using colony forming unit counts, fluorescence spectrophotometry and real-time imaging devices. There was a linear correlation between cell viability and GFP fluorescence. The intensity of the GFP signal was effected by the extracellular pH. For a range of antimicrobials however, there was no correlation between these two parameters. In contrast, for oxidizing agents such as sodium hypochlorite, the antimicrobial of choice for root canal disinfection, there was a correlation between loss of fluorescence and loss of viability. To conclude, the use of a GFP-based system to monitor the antimicrobial activity of compounds on E. faecalis is possible despite significant limitations. This approach is useful for analysis of susceptibility to oxidizing agents. Using real-time measuring devices to follow GFP fluorescence it should be possible to investigate the mode of action and rate of diffusion of oxidizing agents in E. faecalis biofilm.
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Affiliation(s)
- Michel A Hoogenkamp
- Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University, Department of Preventive Dentistry, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands.
| | - Wim Crielaard
- Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University, Department of Preventive Dentistry, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands
| | - Bastiaan P Krom
- Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University, Department of Preventive Dentistry, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands
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Soloviev SO, Kapran AY, Kurylets YP. Oxidation of diesel soot on binary oxide CuCr(Co)-based monoliths. J Environ Sci (China) 2015; 28:171-177. [PMID: 25662252 DOI: 10.1016/j.jes.2014.08.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 03/31/2014] [Revised: 07/31/2014] [Accepted: 08/26/2014] [Indexed: 06/04/2023]
Abstract
Binary oxide systems (CuCr2O4, CuCo2O4), deposited onto cordierite monoliths of honeycomb structure with a second support (finely dispersed Al2O3), were prepared as filters for catalytic combustion of diesel soot using internal combustion engine's gas exhausts (O2, NOx, H2O, CO2) and O3 as oxidizing agents. It is shown that the second support increases soot capacity of aforementioned filters, and causes dispersion of the particles of spinel phases as active components enhancing thereby catalyst activity and selectivity of soot combustion to CO2. Oxidants used can be arranged with reference to decreasing their activity in a following series: O3≫NO2>H2O>NO>O2>CO2. Ozone proved to be the most efficient oxidizing agent: the diesel soot combustion by O3 occurs intensively (in the presence of copper chromite based catalyst) even at closing to ambient temperatures. Results obtained give a basis for the conclusion that using a catalytic coating on soot filters in the form of aforementioned binary oxide systems and ozone as the initiator of the oxidation processes is a promising approach in solving the problem of comprehensive purification of automotive exhaust gases at relatively low temperatures, known as the "cold start" problem.
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Affiliation(s)
- Sergiy O Soloviev
- L.V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospekt Nauky, 03028 Kyiv, Ukraine.
| | - Andriy Y Kapran
- L.V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospekt Nauky, 03028 Kyiv, Ukraine
| | - Yaroslava P Kurylets
- L.V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospekt Nauky, 03028 Kyiv, Ukraine
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Posada-Izquierdo GD, Pérez-Rodríguez F, López-Gálvez F, Allende A, Gil MI, Zurera G. Modeling growth of Escherichia coli O157:H7 in fresh-cut lettuce treated with neutral electrolyzed water and under modified atmosphere packaging. Int J Food Microbiol 2014; 177:1-8. [PMID: 24583345 DOI: 10.1016/j.ijfoodmicro.2013.12.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [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: 02/11/2013] [Revised: 11/21/2013] [Accepted: 12/25/2013] [Indexed: 11/29/2022]
Abstract
The purpose of this study was to evaluate and model the growth of Escherichia coli O157:H7 in fresh-cut lettuce submitted to a neutral electrolyzed water (NEW) treatment, packaged in passive modified atmosphere and subsequently stored at different temperatures (4, 8, 13, 16°C) for a maximum of 27 days. Results indicated that E. coli O157:H7 was able to grow at 8, 13, and 16°C, and declined at 4°C. However at 8°C, the lag time lasted 19 days, above the typical shelf-life time for this type of products. A secondary model predicting growth rate as a function of temperature was developed based on a square-root function. A comparison with literature data indicated that the growth predicted by the model for E. coli O157:H7 was again lower than those observed with other disinfection treatments or packaging conditions (chlorinated water, untreated product, NEW, etc.). The specific models here developed might be applied to predict growth in products treated with NEW and to improve existing quantitative risk assessments.
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Affiliation(s)
- Guiomar D Posada-Izquierdo
- Department of Food Science and Technology, University of Cordoba, Campus de Rabanales, Edificio Darwin-C1, 14014 Córdoba, Spain.
| | - Fernando Pérez-Rodríguez
- Department of Food Science and Technology, University of Cordoba, Campus de Rabanales, Edificio Darwin-C1, 14014 Córdoba, Spain
| | - Francisco López-Gálvez
- Research Group on Quality, Safety and Bioactivity of Plant Foods, Department of Food Science and Technology, CEBAS-CSIC, Murcia, Spain
| | - Ana Allende
- Research Group on Quality, Safety and Bioactivity of Plant Foods, Department of Food Science and Technology, CEBAS-CSIC, Murcia, Spain
| | - María I Gil
- Research Group on Quality, Safety and Bioactivity of Plant Foods, Department of Food Science and Technology, CEBAS-CSIC, Murcia, Spain
| | - Gonzalo Zurera
- Department of Food Science and Technology, University of Cordoba, Campus de Rabanales, Edificio Darwin-C1, 14014 Córdoba, Spain
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