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Delangiz N, Aliyar S, Pashapoor N, Nobaharan K, Asgari Lajayer B, Rodríguez-Couto S. Can polymer-degrading microorganisms solve the bottleneck of plastics' environmental challenges? CHEMOSPHERE 2022; 294:133709. [PMID: 35074325 DOI: 10.1016/j.chemosphere.2022.133709] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 11/27/2021] [Accepted: 01/18/2022] [Indexed: 06/14/2023]
Abstract
Increasing world population and industrial activities have enhanced anthropogenic pollution, plastic pollution being especially alarming. So, plastics should be recycled and/or make them biodegradable. Chemical and physical remediating methods are usually energy consuming and costly. In addition, they are not ecofriendly and usually produce toxic byproducts. Bioremediation is a proper option as it is cost-efficient and environmentally friendly. Plastic production and consumption are increasing daily, and, as a consequence, more microorganisms are exposed to these nonbiodegradable polymers. Therefore, investigating new efficient microorganisms and increasing the knowledge about their biology can pave the way for efficient and feasible plastic bioremediation processes. In this sense, omics, systems biology and bioinformatics are three important fields to analyze the biodegradation pathways in microorganisms. Based on the above-mentioned technologies, researchers can engineer microorganisms with specific desired properties to make bioremediation more efficient.
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Affiliation(s)
- Nasser Delangiz
- Department of Plant Biotechnology and Breeding, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
| | - Sajad Aliyar
- Department of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
| | - Neda Pashapoor
- Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia, Iran
| | | | - Behnam Asgari Lajayer
- Department of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
| | - Susana Rodríguez-Couto
- Department of Separation Science, LUT School of Engineering Science, LUT University, Sammonkatu 12, FI-50130 Mikkeli, Finland
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Alp Tokat T, Türkmenoğlu B, Güzel Y, Kızılcan DŞ. Investigation of 3D pharmacophore of N-benzyl benzamide molecules of melanogenesis inhibitors using a new descriptor Klopman index: uncertainties in model. J Mol Model 2019; 25:247. [PMID: 31342175 DOI: 10.1007/s00894-019-4120-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 07/03/2019] [Indexed: 12/21/2022]
Abstract
We used a new descriptor called the Klopman index in our software of the "molecular comparative electron topology" (MCET) method to reduce the uncertainty resulting from the descriptors used in QSAR studies. The 3D pharmacophore model (3D-PhaM), which can demonstrate three-dimensional interaction between the ligand -receptor (L-R), is only possible with local reactive descriptors (LRD). The Klopman index, containing both Coulombic and frontier orbital and interactions of atoms of the ligand, is a good LRD. Molecular conformers having the best matching atoms with the template conformer can be selected as one of the most suitable spatial structures for interaction with the receptor, and the LRD values of the atoms in this conformer serve to determine 3D-PhaM. The 3D-PhaM of the N-benzyl benzamide derivatives, such as the melanogenesis inhibitor, was determined by ligand-based MCET and confirmed by the structure-based FlexX docking method. For compounds of the training set (42) and the external cross validation test set (6), the Q2 (0.862) and R2 (0.913) of the statistical parameters were calculated, respectively, and were checked by rm2 (0.85) of the stringent validation.
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Affiliation(s)
- Tuğba Alp Tokat
- Department of Chemistry, Faculty of Science, Erciyes University, 38039, Kayseri, Turkey
| | - Burçin Türkmenoğlu
- Department of Chemistry, Faculty of Science, Erciyes University, 38039, Kayseri, Turkey.
| | - Yahya Güzel
- Department of Chemistry, Faculty of Science, Erciyes University, 38039, Kayseri, Turkey
| | - Dilek Şeyma Kızılcan
- Department of Chemistry, Faculty of Science, Erciyes University, 38039, Kayseri, Turkey
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4
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Satpathy R. Quantitative Structure-Activity Modelling of Toxic Compounds. ENVIRONMENTAL CHEMISTRY FOR A SUSTAINABLE WORLD 2018. [DOI: 10.1007/978-3-319-70166-0_10] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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5
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Dvořák P, Nikel PI, Damborský J, de Lorenzo V. Bioremediation 3 . 0 : Engineering pollutant-removing bacteria in the times of systemic biology. Biotechnol Adv 2017; 35:845-866. [DOI: 10.1016/j.biotechadv.2017.08.001] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Revised: 08/01/2017] [Accepted: 08/04/2017] [Indexed: 01/07/2023]
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Selvaraj C, Sakkiah S, Tong W, Hong H. Molecular dynamics simulations and applications in computational toxicology and nanotoxicology. Food Chem Toxicol 2017; 112:495-506. [PMID: 28843597 DOI: 10.1016/j.fct.2017.08.028] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 08/08/2017] [Accepted: 08/22/2017] [Indexed: 12/13/2022]
Abstract
Nanotoxicology studies toxicity of nanomaterials and has been widely applied in biomedical researches to explore toxicity of various biological systems. Investigating biological systems through in vivo and in vitro methods is expensive and time taking. Therefore, computational toxicology, a multi-discipline field that utilizes computational power and algorithms to examine toxicology of biological systems, has gained attractions to scientists. Molecular dynamics (MD) simulations of biomolecules such as proteins and DNA are popular for understanding of interactions between biological systems and chemicals in computational toxicology. In this paper, we review MD simulation methods, protocol for running MD simulations and their applications in studies of toxicity and nanotechnology. We also briefly summarize some popular software tools for execution of MD simulations.
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Affiliation(s)
- Chandrabose Selvaraj
- Division of Bioinformatics and Biostatistics, National Center for Toxicology Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Sugunadevi Sakkiah
- Division of Bioinformatics and Biostatistics, National Center for Toxicology Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Weida Tong
- Division of Bioinformatics and Biostatistics, National Center for Toxicology Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Huixiao Hong
- Division of Bioinformatics and Biostatistics, National Center for Toxicology Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA.
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Toropova AP, Toropov AA, Marzo M, Escher SE, Dorne JL, Georgiadis N, Benfenati E. The application of new HARD-descriptor available from the CORAL software to building up NOAEL models. Food Chem Toxicol 2017; 112:544-550. [PMID: 28366846 DOI: 10.1016/j.fct.2017.03.060] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 03/16/2017] [Accepted: 03/28/2017] [Indexed: 12/19/2022]
Abstract
Continuous QSAR models have been developed and validated for the prediction of no-observed-adverse-effect (NOAEL) in rats, using training and test sets from the Fraunhofer RepDose® database and EFSA's Chemical Hazards Database: OpenFoodTox. This paper demonstrates that the HARD index, as an integrated attribute of SMILES, improves the prediction power of NOAEL values using the continuous QSAR models and Monte Carlo simulations. The HARD-index is a line of eleven symbols, which represents the presence, or absence of eight chemical elements (nitrogen, oxygen, sulfur, phosphorus, fluorine, chlorine, bromine, and iodine) and different kinds of chemical bonds (double bond, triple bond, and stereo chemical bond). Optimal molecular descriptors calculated with the Monte Carlo technique (maximization of correlation coefficient between the descriptor and endpoint) give satisfactory predictive models for NOAEL. Optimal molecular descriptors calculated in this way with the Monte Carlo technique (maximization of correlation coefficient between the descriptor and endpoint) give amongst the best results available in the literature. The models are built up in accordance with OECD principles.
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Affiliation(s)
- Alla P Toropova
- Department of Environmental Health Science, Laboratory of Environmental Chemistry and Toxicology, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156 Milano, Italy.
| | - Andrey A Toropov
- Department of Environmental Health Science, Laboratory of Environmental Chemistry and Toxicology, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156 Milano, Italy
| | - Marco Marzo
- Department of Environmental Health Science, Laboratory of Environmental Chemistry and Toxicology, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156 Milano, Italy
| | - Sylvia E Escher
- Fraunhofer Institute for Toxicology and Experimental Medicine ITEM, Hannover, Germany
| | - Jean Lou Dorne
- Scientific Committee and Emerging Risks Unit, European Food Safety Authority, Via Carlo Magno 1A, 43126 Parma, Italy
| | - Nikolaos Georgiadis
- Scientific Committee and Emerging Risks Unit, European Food Safety Authority, Via Carlo Magno 1A, 43126 Parma, Italy
| | - Emilio Benfenati
- Department of Environmental Health Science, Laboratory of Environmental Chemistry and Toxicology, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156 Milano, Italy
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Cappelli CI, Cassano A, Golbamaki A, Moggio Y, Lombardo A, Colafranceschi M, Benfenati E. Assessment of in silico models for acute aquatic toxicity towards fish under REACH regulation. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2015; 26:977-999. [PMID: 26540526 DOI: 10.1080/1062936x.2015.1104519] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We evaluated the performance of eight QSAR in silico modelling packages (ACD/ToxSuite™, ADMET Predictor™, DEMETRA, ECOSAR, TerraQSAR™, Toxicity Estimation Software Tool, TOPKAT™ and VEGA) for acute aquatic toxicity towards two species of fish: Fathead Minnow and Rainbow Trout. For the Fathead Minnow, we compared model predictions for 567 substances with the corresponding experimental values for 96-h median lethal concentrations (LC50). Some models gave good results, with r2 up to 0.85. We also classified the predictions of all the models into four toxicity classes defined by CLP. This permitted us to assess other parameters, such as the percentage of correct predictions for each class. Then we used a set of 351 substances with toxicity data towards Rainbow Trout (96-h LC50). In this case the predictability was unacceptable for all the in silico models. The calculated r2 gave poor correlations (≤0.53). Another analysis was performed according to chemical classes and for mode of action. In the first case, all the classes show a high percentage of correct predictions, in the second case only narcotics and polar narcotics were predicted with good confidence. The results indicate the possibility of using in silico methods to estimate aquatic toxicity within REACH regulation, after careful evaluation.
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Affiliation(s)
- C I Cappelli
- a Department of Environmental Health Sciences , IRCCS Istituto di Ricerche Farmacologiche Mario Negri , Milan , Italy
| | - A Cassano
- a Department of Environmental Health Sciences , IRCCS Istituto di Ricerche Farmacologiche Mario Negri , Milan , Italy
| | - A Golbamaki
- a Department of Environmental Health Sciences , IRCCS Istituto di Ricerche Farmacologiche Mario Negri , Milan , Italy
| | - Y Moggio
- a Department of Environmental Health Sciences , IRCCS Istituto di Ricerche Farmacologiche Mario Negri , Milan , Italy
| | - A Lombardo
- a Department of Environmental Health Sciences , IRCCS Istituto di Ricerche Farmacologiche Mario Negri , Milan , Italy
| | - M Colafranceschi
- b Health and Environment Department , Istituto Superiore di Sanità , Rome , Italy
| | - E Benfenati
- a Department of Environmental Health Sciences , IRCCS Istituto di Ricerche Farmacologiche Mario Negri , Milan , Italy
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Davies AJ, Hope MJ. Bayesian inference-based environmental decision support systems for oil spill response strategy selection. MARINE POLLUTION BULLETIN 2015; 96:87-102. [PMID: 26006775 DOI: 10.1016/j.marpolbul.2015.05.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 05/13/2015] [Accepted: 05/13/2015] [Indexed: 06/04/2023]
Abstract
Contingency plans are essential in guiding the response to marine oil spills. However, they are written before the pollution event occurs so must contain some degree of assumption and prediction and hence may be unsuitable for a real incident when it occurs. The use of Bayesian networks in ecology, environmental management, oil spill contingency planning and post-incident analysis is reviewed and analysed to establish their suitability for use as real-time environmental decision support systems during an oil spill response. It is demonstrated that Bayesian networks are appropriate for facilitating the re-assessment and re-validation of contingency plans following pollutant release, thus helping ensure that the optimum response strategy is adopted. This can minimise the possibility of sub-optimal response strategies causing additional environmental and socioeconomic damage beyond the original pollution event.
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Affiliation(s)
| | - Max J Hope
- University of Ulster, Room G271, School of Environmental Sciences, Coleraine Campus, Cromore Road, Coleraine, Co. Londonderry BT52 1SA, UK.
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10
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Larsson M, van den Berg M, Brenerová P, van Duursen MBM, van Ede KI, Lohr C, Luecke-Johansson S, Machala M, Neser S, Pěnčíková K, Poellinger L, Schrenk D, Strapáčová S, Vondráček J, Andersson PL. Consensus toxicity factors for polychlorinated dibenzo-p-dioxins, dibenzofurans, and biphenyls combining in silico models and extensive in vitro screening of AhR-mediated effects in human and rodent cells. Chem Res Toxicol 2015; 28:641-50. [PMID: 25654323 DOI: 10.1021/tx500434j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Consensus toxicity factors (CTFs) were developed as a novel approach to establish toxicity factors for risk assessment of dioxin-like compounds (DLCs). Eighteen polychlorinated dibenzo-p-dioxins, dibenzofurans (PCDD/Fs), and biphenyls (PCBs) with assigned World Health Organization toxic equivalency factors (WHO-TEFs) and two additional PCBs were screened in 17 human and rodent bioassays to assess their induction of aryl hydrocarbon receptor-related responses. For each bioassay and compound, relative effect potency values (REPs) compared to 2,3,7,8-tetrachlorodibenzo-p-dioxin were calculated and analyzed. The responses in the human and rodent cell bioassays generally differed. Most notably, the human cell models responded only weakly to PCBs, with 3,3',4,4',5-pentachlorobiphenyl (PCB126) being the only PCB that frequently evoked sufficiently strong responses in human cells to permit us to calculate REP values. Calculated REPs for PCB126 were more than 30 times lower than the WHO-TEF value for PCB126. CTFs were calculated using score and loading vectors from a principal component analysis to establish the ranking of the compounds and, by rescaling, also to provide numerical differences between the different congeners corresponding to the TEF scheme. The CTFs were based on rat and human bioassay data and indicated a significant deviation for PCBs but also for certain PCDD/Fs from the WHO-TEF values. The human CTFs for 2,3,4,7,8-pentachlorodibenzofuran, 1,2,3,4,7,8-hexachlorodibenzofuran, 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin, and 1,2,3,4,7,8,9-heptachlorodibenzofuran were up to 10 times greater than their WHO-TEF values. Quantitative structure-activity relationship models were used to predict CTFs for untested WHO-TEF compounds, suggesting that the WHO-TEF value for 1,2,3,7,8-pentachlorodibenzofuran could be underestimated by an order of magnitude for both human and rodent models. Our results indicate that the CTF approach provides a powerful tool for condensing data from batteries of screening tests using compounds with similar mechanisms of action, which can be used to improve risk assessment of DLCs.
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Affiliation(s)
- Malin Larsson
- †Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
| | - Martin van den Berg
- ‡Endocrine Toxicology Group, Institute for Risk Assessment Sciences, Utrecht University, P.O. Box 80177, NL-3508 TD Utrecht, The Netherlands
| | - Petra Brenerová
- #Department of Chemistry and Toxicology, Veterinary Research Institute, 621 32 Brno, Czech Republic
| | - Majorie B M van Duursen
- ‡Endocrine Toxicology Group, Institute for Risk Assessment Sciences, Utrecht University, P.O. Box 80177, NL-3508 TD Utrecht, The Netherlands
| | - Karin I van Ede
- ‡Endocrine Toxicology Group, Institute for Risk Assessment Sciences, Utrecht University, P.O. Box 80177, NL-3508 TD Utrecht, The Netherlands
| | - Christiane Lohr
- ⊥Department of Food Chemistry and Environmental Toxicology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Sandra Luecke-Johansson
- §Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden
| | - Miroslav Machala
- #Department of Chemistry and Toxicology, Veterinary Research Institute, 621 32 Brno, Czech Republic
| | - Sylke Neser
- ⊥Department of Food Chemistry and Environmental Toxicology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Kateřina Pěnčíková
- #Department of Chemistry and Toxicology, Veterinary Research Institute, 621 32 Brno, Czech Republic
| | - Lorenz Poellinger
- §Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden
| | - Dieter Schrenk
- ⊥Department of Food Chemistry and Environmental Toxicology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Simona Strapáčová
- #Department of Chemistry and Toxicology, Veterinary Research Institute, 621 32 Brno, Czech Republic
| | - Jan Vondráček
- #Department of Chemistry and Toxicology, Veterinary Research Institute, 621 32 Brno, Czech Republic.,∥Department of Cytokinetics, Institute of Biophysics AS CR, 612 65 Brno, Czech Republic
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Arora PK, Bae H. Integration of bioinformatics to biodegradation. Biol Proced Online 2014; 16:8. [PMID: 24808763 PMCID: PMC4012781 DOI: 10.1186/1480-9222-16-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 04/19/2014] [Indexed: 12/22/2022] Open
Abstract
Bioinformatics and biodegradation are two primary scientific fields in applied microbiology and biotechnology. The present review describes development of various bioinformatics tools that may be applied in the field of biodegradation. Several databases, including the University of Minnesota Biocatalysis/Biodegradation database (UM-BBD), a database of biodegradative oxygenases (OxDBase), Biodegradation Network-Molecular Biology Database (Bionemo) MetaCyc, and BioCyc have been developed to enable access to information related to biochemistry and genetics of microbial degradation. In addition, several bioinformatics tools for predicting toxicity and biodegradation of chemicals have been developed. Furthermore, the whole genomes of several potential degrading bacteria have been sequenced and annotated using bioinformatics tools.
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Affiliation(s)
- Pankaj Kumar Arora
- School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea
| | - Hanhong Bae
- School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea
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12
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Larsson M, Kumar Mishra B, Tysklind M, Linusson A, Andersson PL. On the use of electronic descriptors for QSAR modelling of PCDDs, PCDFs and dioxin-like PCBs. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2013; 24:461-479. [PMID: 23724952 DOI: 10.1080/1062936x.2013.791719] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The electronic properties of 29 polychlorinated dibenzo-p-dioxins and dibenzofurans and dioxin-like polychlorinated biphenyls that have been included in the toxic equivalency factor system have been investigated and used to derive quantum mechanical (QM) chemical descriptors for QSAR modelling. Their utility in this context was investigated alongside descriptors based on ultraviolet absorption data and traditional 2D descriptors including log K(ow), polarizability, molecular surface properties, van der Waals volume and selected connectivity indices. The QM descriptors were calculated using the semi-empirical AM1 method and the density functional theory method B3-LYP/6-31G**. Atom-specific and molecular quantum chemical descriptors were calculated to compare the electronic properties of dioxin-like compounds regardless of their chemical class, with particular emphasis on the lateral positions. Multivariate analysis revealed differences between the chemical classes in terms of their electronic properties and also highlighted differences between congeners. The results obtained demonstrated the importance of considering molecular orbital energies, but also indicated that the ratios of the coefficients of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) at the lateral carbons were important. In addition, the digitalized UV spectra contained chemical information that provided crucial insights into dioxin-like activity.
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Affiliation(s)
- M Larsson
- Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
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13
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Putz MV, Putz AM. DFT Chemical Reactivity Driven by Biological Activity: Applications for the Toxicological Fate of Chlorinated PAHs. STRUCTURE AND BONDING 2012. [DOI: 10.1007/978-3-642-32750-6_6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Dimitrov S, Dimitrova N, Georgieva D, Vasilev K, Hatfield T, Straka J, Mekenyan O. Simulation of chemical metabolism for fate and hazard assessment. III. New developments of the bioconcentration factor base-line model. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2012; 23:17-36. [PMID: 22014234 DOI: 10.1080/1062936x.2011.623321] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The new development of the bioconcentration factor (BCF) base-line model of Dimitrov et al. [SAR QSAR Environ. Res. 6 (2005), pp. 531-554] is presented. The model applicability domain was expanded by enlarging the training set of the model up to 705 chemicals. The list of chemical-dependent mitigating factors was expanded by including water solubility of chemicals. The original empirical term for estimating ionization of chemicals was mechanistically analysed using two different approaches. In the first one, the ionization potential of chemicals was estimated based on the acid dissociation constant (pK(a) ). This term was found to be less adequate for inclusion in the ultimate BCF model, due to overestimating ionization of chemicals. The second approach, estimating the ionization as a ratio between distribution and partition coefficients (log P and log D), was found to be more successful. The new ionization term allows modelling of chemicals with both acidic and basic functionalities and chemicals undergoing different degrees of ionization. The significance of the different mitigating factors which can reduce the maximum bioconcentration potential of the chemicals was re-formulated and model parameters re-evaluated.
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Affiliation(s)
- S Dimitrov
- Laboratory of Mathematical Chemistry, University Prof. As. Zlatarov, Bourgas, Bulgaria
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15
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Milan C, Schifanella O, Roncaglioni A, Benfenati E. Comparison and possible use of in silico tools for carcinogenicity within REACH legislation. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2011; 29:300-323. [PMID: 22107165 DOI: 10.1080/10590501.2011.629973] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Seven in silico models have been used to assess the prediction accuracy of chemical compound carcinogenicity. More than 1500 compounds with experimental values have been used to evaluate the models. Here we review the application of these models for toxicity prediction and their advantages and disadvantages, discussing the different approaches underlying the models and their main critical points. Some models have fewer false negatives while others are better at avoiding false positives. Since carcinogenicity is typically evaluated using a series of studies, identification of a strategy using one, or preferably a battery of in silico models, could reduce the number of animal studies needed.
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Affiliation(s)
- Chiara Milan
- Laboratory of Chemistry and Environmental Toxicology, Istituto di Ricerche Farmacologiche Mario Negri, Milano, Italy
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D’Souza MJ, Alabed GJ, Wheatley JM, Roberts N, Veturi Y, Bi X, Continisio CH. A Database Developed with Information Extracted from Chemotherapy Drug Package Inserts to Enhance Future Prescriptions. CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION WORKSHOPS. IEEE COMPUTER SOCIETY CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION. WORKSHOPS 2011; 2011:219-226. [PMID: 25302340 PMCID: PMC4187114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Package inserts of Food and Drug Administration (FDA) approved prescription drugs, including chemotherapy drugs, must follow a specific format imposed by the FDA. These inserts are created by unrelated pharmaceutical companies and as a result tend to be very different in the way the required information is reported. Chemical and pharmacokinetic properties including absorption, distribution, metabolism, excretion, and toxicity (ADME/Tox) are crucial elements to a prescribing information packet and are often missing from the reported data. This undergraduate research project analyzes the information packets of 85 randomly chosen chemically diverse chemotherapy drugs for four parameters important to patient care; viz, volume of distribution (VD), elimination half-life (t1/2), bioavailability, and water solubility. The prescribing information from the package inserts of each was analyzed in detail and pertinent information was consequently tabulated into a database using a commercial informatics platform. Then using a substructure search-tool, sixty-five chemotherapy drugs containing a carbonyl group in their chemical structure were selected and as hypothesized, it was found that many of these packets were significantly lacking in the reporting of the four parameters of interest. To further enhance this cataloged data, a freely available online database was consequently developed (http://annotation.dbi.udel.edu/CancerDB/) with the intention that the chemical, biological, and clinical community will now add some of the missing parameters.
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Affiliation(s)
| | - Ghada J. Alabed
- Department of Chemistry, Wesley College, Dover, DE 19901, USA
| | | | - Natalia Roberts
- Department of Computer & Information Sciences, University of Delaware, Newark, DE, 19716, USA
| | - Yogasudha Veturi
- Department of Computer & Information Sciences, University of Delaware, Newark, DE, 19716, USA
| | - Xia Bi
- Department of Computer & Information Sciences, University of Delaware, Newark, DE, 19716, USA
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Boriani E, Mariani A, Baderna D, Moretti C, Lodi M, Benfenati E. ERICA: A multiparametric toxicological risk index for the assessment of environmental healthiness. ENVIRONMENT INTERNATIONAL 2010; 36:665-674. [PMID: 20542570 DOI: 10.1016/j.envint.2010.04.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Revised: 04/12/2010] [Accepted: 04/29/2010] [Indexed: 05/29/2023]
Abstract
A risk assessment strategy considering the impact of chemicals on the whole ecosystem has been developed in order to create a sound and useful method for quantifying and comparing the global risk posed by the main different hazardous chemicals found in the environment. This index, called Environmental Risk Index for Chemical Assessment (ERICA), merges in a single number the environmental assessment, the human health risk assessment and the uncertainty due to missing or uncertain data. ERICA uses a dedicated scoring system with parameters for the main characteristics of the pollutants. The main advantage is that it preserves a simple approach by condensing in this single value an analysis of the risk for the area under observation. ERICA quantifies and compares the global risk posed by hazardous chemicals found in the environment and can be considered a diagnostic and prognostic method for environmental contaminants in critical and potentially dangerous sites, such as incinerators, landfills and industrial areas or in broader geographical areas. The application of the proposed integrated index provides a preliminary quantitative analysis of possible environmental alert due to the presence of one or some pollutants in the investigated site. This paper presents the method and the equations behind the index and a first case study based on the Italian legislation and a pilot study located on the Italian seacoast.
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Affiliation(s)
- Elena Boriani
- Laboratory of Environmental Chemistry and Toxicology, Istituto di Ricerche Farmacologiche Mario Negri, 20156 Milan, Italy.
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Péry ARR, Desmots S, Mombelli E. Substance-tailored testing strategies in toxicology: an in silico methodology based on QSAR modeling of toxicological thresholds and Monte Carlo simulations of toxicological testing. Regul Toxicol Pharmacol 2009; 56:82-92. [PMID: 19766156 DOI: 10.1016/j.yrtph.2009.09.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Revised: 09/08/2009] [Accepted: 09/11/2009] [Indexed: 11/29/2022]
Abstract
The design of toxicological testing strategies aimed at identifying the toxic effects of chemicals without (or with a minimal) recourse to animal experimentation is an important issue for toxicological regulations and for industrial decision-making. This article describes an original approach which enables the design of substance-tailored testing strategies with a specified performance in terms of false-positive and false-negative rates. The outcome of toxicological testing is simulated in a different way than previously published articles on the topic. Indeed, toxicological outcomes are simulated not only as a function of the performance of toxicological tests but also as a function of the physico-chemical properties of chemicals. The required inputs for our approach are QSAR predictions for the LOAELs of the toxicological effect of interest and statistical distributions describing the relationship existing between in vivo LOAEL values and results from in vitro tests. Our methodology is able to correctly predict the performance of testing strategies designed to analyze the teratogenic effects of two chemicals: di(2-ethylhexyl)phthalate and Indomethacin. The proposed decision-support methodology can be adapted to any toxicological context as long as a statistical comparison between in vitro and in vivo results is possible and QSAR models for the toxicological effect of interest can be developed.
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Affiliation(s)
- Alexandre R R Péry
- Institut National de l'Environnement Industriel et des Risques (INERIS), BP2, F-60550 Verneuil en Halatte, France
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Pery A, Henegar A, Mombelli E. Maximum-Likelihood Estimation of Predictive Uncertainty in Probabilistic QSAR Modeling. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/qsar.200860116] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Zhao C, Boriani E, Chana A, Roncaglioni A, Benfenati E. A new hybrid system of QSAR models for predicting bioconcentration factors (BCF). CHEMOSPHERE 2008; 73:1701-1707. [PMID: 18954891 DOI: 10.1016/j.chemosphere.2008.09.033] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2008] [Revised: 09/10/2008] [Accepted: 09/12/2008] [Indexed: 05/27/2023]
Abstract
The aim was to develop a reliable and practical quantitative structure-activity relationship (QSAR) model validated by strict conditions for predicting bioconcentration factors (BCF). We built up several QSAR models starting from a large data set of 473 heterogeneous chemicals, based on multiple linear regression (MLR), radial basis function neural network (RBFNN) and support vector machine (SVM) methods. To improve the results, we also applied a hybrid model, which gave better prediction than single models. All models were statistically analysed using strict criteria, including an external test set. The outliers were also examined to understand better in which cases large errors were to be expected and to improve the predictive models. The models offer more robust tools for regulatory purposes, on the basis of the statistical results and the quality check on the input data.
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Affiliation(s)
- Chunyan Zhao
- Department of Chemistry, Lanzhou University, Lanzhou, China
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