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Volatilomic Signatures of AGS and SNU-1 Gastric Cancer Cell Lines. Molecules 2022; 27:molecules27134012. [PMID: 35807254 PMCID: PMC9268292 DOI: 10.3390/molecules27134012] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/18/2022] [Accepted: 06/18/2022] [Indexed: 02/06/2023] Open
Abstract
In vitro studies can help reveal the biochemical pathways underlying the origin of volatile indicators of numerous diseases. The key objective of this study is to identify the potential biomarkers of gastric cancer. For this purpose, the volatilomic signatures of two human gastric cancer cell lines, AGS (human gastric adenocarcinoma) and SNU-1 (human gastric carcinoma), and one normal gastric mucosa cell line (GES-1) were investigated. More specifically, gas chromatography mass spectrometry has been applied to pinpoint changes in cell metabolism triggered by cancer. In total, ten volatiles were found to be metabolized, and thirty-five were produced by cells under study. The volatiles consumed were mainly six aldehydes and two heterocyclics, whereas the volatiles released embraced twelve ketones, eight alcohols, six hydrocarbons, three esters, three ethers, and three aromatic compounds. The SNU-1 cell line was found to have significantly altered metabolism in comparison to normal GES-1 cells. This was manifested by the decreased production of alcohols and ketones and the upregulated emission of esters. The AGS cells exhibited the increased production of methyl ketones containing an odd number of carbons, namely 2-tridecanone, 2-pentadecanone, and 2-heptadecanone. This study provides evidence that the cancer state modifies the volatilome of human cells.
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Ying L, Chen Y, Zhong Z, Wu Y, Hu L, Wen C. Effects of long-term alcohol exposure on the pharmacokinetic profiles of ketamine and norketamine in rats. Alcohol 2021; 96:55-61. [PMID: 33549609 DOI: 10.1016/j.alcohol.2021.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 01/24/2021] [Accepted: 01/28/2021] [Indexed: 11/26/2022]
Abstract
BACKGROUND Alcohol abuse has become a serious health issue worldwide. Ketamine can reduce addiction risk among patients with alcohol use disorders. This study aimed to determine the effects of alcohol on the pharmacokinetics of ketamine during long-term alcohol exposure. METHOD An ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method for determination of ketamine and norketamine was developed and validated. A total of 15 rats were given 40% alcohol for 3 weeks. The pharmacokinetics of ketamine were measured at time zero, 1 week, 2 weeks, and 3 weeks after alcohol exposure. The metabolic capability of liver CYP450 was evaluated using three probe drugs: metoprolol, phenacetin, and tolbutamide. RESULTS During drinking of 40% alcohol, the AUC(0-t), AUC(0-∞), and Cmax of ketamine and norketamine significantly increased, while V and CL significantly decreased with time (p < 0.001). The pharmacokinetic changes of norketamine were highly consistent with ketamine. Additionally, the concentration ratio of norketamine/ketamine in sample time also decreased over time. However, there were no pharmacokinetic changes of three probe drugs, which indicated there was no significant change of liver CYPs activities. CONCLUSION Alcohol significantly increases plasma concentration of ketamine and norketamine. The effect of alcohol on pharmacokinetics of ketamine should be considered in clinical therapy.
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Leiherer A, Ślefarska D, Leja M, Heinzle C, Mündlein A, Kikuste I, Mezmale L, Drexel H, Mayhew CA, Mochalski P. The Volatilomic Footprints of Human HGC-27 and CLS-145 Gastric Cancer Cell Lines. Front Mol Biosci 2021; 7:607904. [PMID: 33585559 PMCID: PMC7874186 DOI: 10.3389/fmolb.2020.607904] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 12/09/2020] [Indexed: 12/12/2022] Open
Abstract
The presence of certain volatile biomarkers in the breath of patients with gastric cancer has been reported by several studies; however, the origin of these compounds remains controversial. In vitro studies, involving gastric cancer cells may address this problem and aid in revealing the biochemical pathways underlying the production and metabolism of gastric cancer volatile indicators. Gas chromatography with mass spectrometric detection, coupled with headspace needle trap extraction as the pre-concentration technique, has been applied to map the volatilomic footprints of human HGC-27 and CLS-145 gastric cancer cell lines and normal Human Stomach Epithelial Cells (HSEC). In total, 27 volatile compounds are found to be associated with metabolism occurring in HGC-27, CLS-145, and HSEC. Amongst these, the headspace concentrations of 12 volatiles were found to be reduced compared to those above just the cultivating medium, namely there was an observed uptake of eight aldehydes (2-methylpropanal, 2-methyl-2-propenal, 2-methylbutanal, 3-methylbutanal, hexanal, heptanal, nonanal, and benzaldehyde), three heterocyclic compounds (2-methyl-furan, 2-ethyl-furan, and 2-pentyl-furan), and one sulfur-containing compound (dimethyl disulphide). For the other 15 volatiles, the headspace concentrations above the healthy and cancerous cells were found to be higher than those found above the cultivating medium, namely the cells were found to release three esters (ethyl acetate, ethyl propanoate, and ethyl 2-methylbutyrate), seven ketones (2-pentanone, 2-heptanone, 2-nonanone, 2-undecanone, 2-tridecanone, 2-pentadecanone, and 2-heptadecanone), three alcohols (2-methyl-1-butanol, 3-methyl-1-butanol, and 2-ethyl-1-hexanol), one aromatic compound (toluene), and one sulfur containing compound [2-methyl-5-(methylthio) furan]. In comparison to HSEC, HGC-27 cancer cell lines were found to have significantly altered metabolism, manifested by an increased production of methyl ketones containing an odd number of carbons. Amongst these species, three volatiles were found exclusively to be produced by this cell line, namely 2-undecanone, 2-tridecanone, and 2-heptadecanone. Another interesting feature of the HGC-27 footprint is the lowered level of alcohols and esters. The CLS-145 cells exhibited less pronounced changes in their volatilomic pattern compared to HSEC. Their footprint was characterized by the upregulated production of esters and 2-ethyl-hexanol and downregulated production of other alcohols. We have therefore demonstrated that it is possible to differentiate between cancerous and healthy gastric cells using biochemical volatile signatures.
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Affiliation(s)
- Andreas Leiherer
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Feldkirch, Austria
- Private University of the Principality of Liechtenstein, Triesen, Liechtenstein
- Medical Central Laboratories, Feldkirch, Austria
| | - Daria Ślefarska
- Institute for Breath Research, University of Innsbruck, Dornbirn, Austria
- Institute of Chemistry, Jan Kochanowski University, Kielce, Poland
| | - Marcis Leja
- Institute of Clinical and Preventive Medicine, University of Latvia, Riga, Latvia
- Faculty of Medicine, University of Latvia, Riga, Latvia
- Riga East University Hospital, Riga, Latvia
| | - Christine Heinzle
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Feldkirch, Austria
| | - Axel Mündlein
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Feldkirch, Austria
| | - Ilze Kikuste
- Institute of Clinical and Preventive Medicine, University of Latvia, Riga, Latvia
- Faculty of Medicine, University of Latvia, Riga, Latvia
- Riga East University Hospital, Riga, Latvia
| | - Linda Mezmale
- Institute of Clinical and Preventive Medicine, University of Latvia, Riga, Latvia
- Faculty of Medicine, University of Latvia, Riga, Latvia
- Riga East University Hospital, Riga, Latvia
| | - Heinz Drexel
- Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Feldkirch, Austria
- Private University of the Principality of Liechtenstein, Triesen, Liechtenstein
- Drexel University College of Medicine, Philadelphia, PA, United States
| | - Chris A. Mayhew
- Institute for Breath Research, University of Innsbruck, Dornbirn, Austria
- Molecular Physics Group, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
| | - Paweł Mochalski
- Institute for Breath Research, University of Innsbruck, Dornbirn, Austria
- Institute of Chemistry, Jan Kochanowski University, Kielce, Poland
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Janfaza S, Khorsand B, Nikkhah M, Zahiri J. Digging deeper into volatile organic compounds associated with cancer. Biol Methods Protoc 2019; 4:bpz014. [PMID: 32161807 PMCID: PMC6994028 DOI: 10.1093/biomethods/bpz014] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 09/25/2019] [Indexed: 12/13/2022] Open
Abstract
Volatile organic compounds (VOCs), produced and emitted through the metabolism of cancer cells or the body's immune system, are considered novel cancer biomarkers for diagnostic purposes. Of late, a large number of work has been done to find a relationship between VOCs' signature of body and cancer. Cancer-related VOCs can be used to detect several types of cancers at the earlier stages which in turn provide a significantly higher chance of survival. Here we aim to provide an updated picture of cancer-related VOCs based on recent findings in this field focusing on cancer odor database.
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Affiliation(s)
- Sajjad Janfaza
- School of Engineering, University of British Columbia, Kelowna, BC, Canada
- Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran 14117, Iran
| | - Babak Khorsand
- Department of Computer Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Maryam Nikkhah
- Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran 14117, Iran
| | - Javad Zahiri
- Bioinformatics and Computational Omics Lab (BioCOOL), Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran 14117, Iran
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Mochalski P, Leja M, Gasenko E, Skapars R, Santare D, Sivins A, Aronsson DE, Ager C, Jaeschke C, Shani G, Mitrovics J, Mayhew CA, Haick H. Ex vivo emission of volatile organic compounds from gastric cancer and non-cancerous tissue. J Breath Res 2018; 12:046005. [PMID: 29893713 DOI: 10.1088/1752-7163/aacbfb] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The presence of certain volatile organic compounds (VOCs) in the breath of patients with gastric cancer has been reported by a number of research groups; however, the source of these compounds remains controversial. Comparison of VOCs emitted from gastric cancer tissue to those emitted from non-cancerous tissue would help in understanding which of the VOCs are associated with gastric cancer and provide a deeper knowledge on their generation. Gas chromatography with mass spectrometric detection (GC-MS) coupled with head-space needle trap extraction (HS-NTE) as the pre-concentration technique, was used to identify and quantify VOCs released by gastric cancer and non-cancerous tissue samples collected from 41 patients during surgery. Excluding contaminants, a total of 32 VOCs were liberated by the tissue samples. The emission of four of them (carbon disulfide, pyridine, 3-methyl-2-butanone and 2-pentanone) was significantly higher from cancer tissue, whereas three compounds (isoprene, γ-butyrolactone and dimethyl sulfide) were in greater concentration from the non-cancerous tissues (Wilcoxon signed-rank test, p < 0.05). Furthermore, the levels of three VOCs (2-methyl-1-propene, 2-propenenitrile and pyrrole) were correlated with the occurrence of H. pylori; and four compounds (acetonitrile, pyridine, toluene and 3-methylpyridine) were associated with tobacco smoking. Ex vivo analysis of VOCs emitted by human tissue samples provides a unique opportunity to identify chemical patterns associated with a cancerous state and can be considered as a complementary source of information on volatile biomarkers found in breath, blood or urine.
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Affiliation(s)
- Pawel Mochalski
- Institute for Breath Research, University of Innsbruck, Rathausplatz 4, A-6850 Dornbirn, Austria. Institute of Chemistry, Jan Kochanowski University, Świętokrzyska 15G, PL-25406 Kielce, Poland
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Anand SS, Campbell JL, Fisher JW. In Vitro Rat Hepatic Metabolism of n-Alkanes: Nonane, Decane, and Tetradecane. Int J Toxicol 2016; 26:325-9. [PMID: 17661223 DOI: 10.1080/10915810701490075] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Jet propellant 8 (JP-8) jet fuel is a complex mixture of aromatic and aliphatic hydrocarbons. The aim of this study was to determine in vitro metabolic rate constants for semivolatile n-alkanes, nonane (C9), decane (C10), and tetradecane (C14), by rat liver microsomal oxidation. The metabolism was assessed by measuring the disappearance of parent compound by gas chromatography. Various concentrations of n-alkanes were incubated with liver microsomes from adult male F-344 rats. Nonlinear kinetic constants for nonane and decane were Vmax(nmol/mg protein/min) = 7.26 ± 0.20 and 2.80 ± 0.35, respectively, and KM( μM) = 294.83 ± 68.67 and 398.70 ± 42.70, respectively. Metabolic capacity as assessed by intrinsic clearance ( Vmax/ KM) was ~four-fold higher for nonane (0.03 ± 0.005) than for decane (0.007 ± 0.001). There was no appreciable metabolism of tetradecane even with higher microsomal protein concentration and longer incubation time. These results show a negative correlation between metabolic clearance and chain length of n-alkanes. These metabolic rate constants will be used to update existing physiologically based pharmacokinetic (PBPK) models for nonane and decane as part of developing a PBPK model for JP-8.
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Affiliation(s)
- Sathanandam S Anand
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia, USA.
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Mochalski P, Unterkofler K. Quantification of selected volatile organic compounds in human urine by gas chromatography selective reagent ionization time of flight mass spectrometry (GC-SRI-TOF-MS) coupled with head-space solid-phase microextraction (HS-SPME). Analyst 2016; 141:4796-803. [DOI: 10.1039/c6an00825a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Selective reagent ionization time of flight mass spectrometry with NO+as the reagent ion in conjunction with gas chromatography and head-space solid-phase microextraction was used to determine 16 volatiles in human urine.
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Affiliation(s)
- Paweł Mochalski
- Breath Research Institute of the University of Innsbruck
- A-6850 Dornbirn
- Austria
| | - Karl Unterkofler
- Breath Research Institute of the University of Innsbruck
- A-6850 Dornbirn
- Austria
- Vorarlberg University of Applied Sciences
- A-6850 Dornbirn
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8
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Lavra L, Catini A, Ulivieri A, Capuano R, Baghernajad Salehi L, Sciacchitano S, Bartolazzi A, Nardis S, Paolesse R, Martinelli E, Di Natale C. Investigation of VOCs associated with different characteristics of breast cancer cells. Sci Rep 2015; 5:13246. [PMID: 26304457 PMCID: PMC4548242 DOI: 10.1038/srep13246] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 06/02/2015] [Indexed: 12/23/2022] Open
Abstract
The efficacy of breath volatile organic compounds (VOCs) analysis for the screening of patients bearing breast cancer lesions has been demonstrated by using gas chromatography and artificial olfactory systems. On the other hand, in-vitro studies suggest that VOCs detection could also give important indications regarding molecular and tumorigenic characteristics of tumor cells. Aim of this study was to analyze VOCs in the headspace of breast cancer cell lines in order to ascertain the potentiality of VOCs signatures in giving information about these cells and set-up a new sensor system able to detect breast tumor-associated VOCs. We identified by Gas Chromatography-Mass Spectrometry analysis a VOCs signature that discriminates breast cancer cells for: i) transformed condition; ii) cell doubling time (CDT); iii) Estrogen and Progesterone Receptors (ER, PgR) expression, and HER2 overexpression. Moreover, the signals obtained from a temperature modulated metal oxide semiconductor gas sensor can be classified in order to recognize VOCs signatures associated with breast cancer cells, CDT and ER expression. Our results demonstrate that VOCs analysis could give clinically relevant information about proliferative and molecular features of breast cancer cells and pose the basis for the optimization of a low-cost diagnostic device to be used for tumors characterization.
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Affiliation(s)
- Luca Lavra
- Labotatory of Biomedical Research "Fondazione Niccolò Cusano per la Ricerca Medico-Scientifica", Niccolò Cusano University, Rome, Italy
| | - Alexandro Catini
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
| | - Alessandra Ulivieri
- Labotatory of Biomedical Research "Fondazione Niccolò Cusano per la Ricerca Medico-Scientifica", Niccolò Cusano University, Rome, Italy
| | - Rosamaria Capuano
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
| | - Leila Baghernajad Salehi
- Labotatory of Biomedical Research "Fondazione Niccolò Cusano per la Ricerca Medico-Scientifica", Niccolò Cusano University, Rome, Italy
| | - Salvatore Sciacchitano
- Labotatory of Biomedical Research "Fondazione Niccolò Cusano per la Ricerca Medico-Scientifica", Niccolò Cusano University, Rome, Italy.,Department of Clinical and Molecular Medicine, University of Rome "Sapienza", Rome, Italy
| | - Armando Bartolazzi
- Department of Pathology, Universitary Hospital Sant'Andrea, Rome, Italy.,Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Hospital, Stockholm, Sweden
| | - Sara Nardis
- Department of Chemical science and technology, University of Rome Tor Vergata, Via di Tor Vergata, 00133 Rome, Italy
| | - Roberto Paolesse
- Department of Chemical science and technology, University of Rome Tor Vergata, Via di Tor Vergata, 00133 Rome, Italy
| | - Eugenio Martinelli
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
| | - Corrado Di Natale
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
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Mochalski P, Al-Zoairy R, Niederwanger A, Unterkofler K, Amann A. Quantitative analysis of volatile organic compounds released and consumed by rat L6 skeletal muscle cells in vitro. J Breath Res 2014; 8:046003. [PMID: 25307263 PMCID: PMC4913865 DOI: 10.1088/1752-7155/8/4/046003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Knowledge of the release of volatile organic compounds (VOCs) by cells provides important information on the origin of VOCs in exhaled breath. Muscle cells are particularly important, since their release of volatiles during the exertion of an effort contributes considerably to breath concentration profiles. Presently, the cultivation of human skeletal muscle cells is encountering a number of obstacles, necessitating the use of animal muscle cells in in vitro studies. Rat L6 skeletal muscle cells are therefore commonly used as a model for studying the molecular mechanisms of human skeletal muscle differentiation and functions, and facilitate the study of the origin and metabolic fate of the endogenously produced compounds observed in breath and skin emanations. Within this study the production and uptake of VOCs by rat L6 skeletal muscle cells were investigated using gas chromatography with mass spectrometric detection, combined with head-space needle trap extraction as the pre-concentration technique (HS-NTE-GC-MS). Seven compounds were found to be produced, whereas sixteen species were consumed (Wilcoxon signed-rank test, p < 0.05) by the cells being studied. The set of released volatiles included two ketones (2-pentanone and 2-nonanone), two volatile sulphur compounds (dimethyl sulfide and methyl 5-methyl-2-furyl sulphide), and three hydrocarbons (2-methyl 1-propene, n-pentane and isoprene). Of the metabolized species there were thirteen aldehydes (2-propenal, 2-methyl 2-propenal, 2-methyl propanal, 2-butenal, 2-methyl butanal, 3-methyl butanal, n-pentanal, 2-methyl 2-butenal, n-hexanal, benzaldehyde, n-octanal, n-nonanal and n-decanal), two esters (n-propyl propionate and n-butyl acetate), and one volatile sulphur compound (dimethyl disulfide). The possible metabolic pathways leading to the uptake and release of these compounds by L6 cells are proposed and discussed. An analysis of the VOCs showed them to have huge potential for the identification and monitoring of some molecular mechanism and conditions.
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Affiliation(s)
- Paweł Mochalski
- Breath Research Institute of the University of Innsbruck, Rathausplatz 4, A-6850 Dornbirn, Austria
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Hodgson E, Wallace AD, Shah RR, Choi K, Joo H. Human Variation and Risk Assessment: Microarray and Other Studies Utilizing Human Hepatocytes and Human Liver Subcellular Preparations. J Biochem Mol Toxicol 2013; 28:1-10. [DOI: 10.1002/jbt.21534] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 09/25/2013] [Accepted: 09/25/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Ernest Hodgson
- North Carolina Agromedicine Institute and Toxicology Program; Department of Applied Ecology; North Carolina State University; Raleigh NC
| | - Andrew D. Wallace
- Department of Environmental and Molecular Toxicology; North Carolina State University; Raleigh NC
| | | | - Kyoungju Choi
- Department of Environmental and Molecular Toxicology; North Carolina State University; Raleigh NC
| | - Hyun Joo
- Department of Environmental and Molecular Toxicology; North Carolina State University; Raleigh NC
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Metabolic interactions of environmental toxicants in humans. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2012. [PMID: 22974747 DOI: 10.1016/b978-0-12-415813-9.00013-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register]
Abstract
A description of the interactions between environmental toxicants following simultaneous exposure or exposure in close temporal sequence is presented. At the metabolic level, such interactions may be based on induction, inhibition, or activation of xenobiotic-metabolizing enzymes. Cytotoxicity may also play a role, particularly in affecting induction of xenobiotic-metabolizing enzymes. The effects of interactions manifested at the level of the expression of toxic endpoints may result from interactions at the metabolic level or may have other causes. New approaches to genome-wide effects (e.g., microarray studies) are also discussed.
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Choi K, Joo H, Campbell JL, Clewell RA, Andersen ME, Clewell HJ. In vitro metabolism of di(2-ethylhexyl) phthalate (DEHP) by various tissues and cytochrome P450s of human and rat. Toxicol In Vitro 2012; 26:315-22. [DOI: 10.1016/j.tiv.2011.12.002] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Accepted: 12/02/2011] [Indexed: 10/14/2022]
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13
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Martin SA, Campbell JL, Tremblay RT, Fisher JW. Development of a physiologically based pharmacokinetic model for inhalation of jet fuels in the rat. Inhal Toxicol 2011; 24:1-26. [DOI: 10.3109/08958378.2011.631297] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ragas AMJ, Oldenkamp R, Preeker NL, Wernicke J, Schlink U. Cumulative risk assessment of chemical exposures in urban environments. ENVIRONMENT INTERNATIONAL 2011; 37:872-881. [PMID: 21450344 DOI: 10.1016/j.envint.2011.02.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 01/13/2011] [Accepted: 02/20/2011] [Indexed: 05/30/2023]
Abstract
We performed a cumulative risk assessment for people living in a hypothetical urban environment, called Urbania. The main aims of the study were to demonstrate how a cumulative risk assessment for a middle-sized European city can be performed and to identify the bottlenecks in terms of data availability and knowledge gaps. The assessment focused on five air pollutants (i.e., PM₁₀, benzene, toluene, nonane and naphthalene) and six food pesticides (i.e., acetamiprid, carbendazim, chlorpyrifos, diazinon, imidacloprid and permethrin). Exposure predictions showed that PM₁₀, benzene and naphthalene exposure frequently exceeded the standards, and that the indoor environment contributed more than the outdoor environment. Effect predictions showed that mixture and interaction effects were generally limited. However, model calculations indicated potential synergistic effects between naphthalene and benzene and between chlorpyrifos, diazinon and toluene. PM₁₀ dominated the health impact expressed in Disability Adjusted Life Years (DALYs). We conclude that measures to reduce the health impact of environmental pollution should focus on the improvement of indoor air quality and the reduction of PM₁₀ emissions. Cumulative risk assessment can be improved by (1) the development of person-oriented exposure models that can simulate the cumulative exposure history of individuals, (2) a better mechanistic understanding of the effects of cumulative stressors, and (3) the development of instruments to prioritize stressors for inclusion in cumulative risk assessments.
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Affiliation(s)
- Ad M J Ragas
- Department of Environmental Science, Institute for Wetland and Water Research, Radboud University Nijmegen, 6500 GL Nijmegen, The Netherlands.
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Tremblay RT, Martin SA, Fisher JW. Metabolites from inhalation of aerosolized S-8 synthetic jet fuel in rats. Inhal Toxicol 2011; 23:11-6. [PMID: 21222558 DOI: 10.3109/08958378.2010.535573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Alternative fuels are being considered for civilian and military uses. One of these is S-8, a replacement jet fuel synthesized using the Fischer-Tropsch process, which contains no aromatic compounds and is mainly composed of straight and branched alkanes. Metabolites of S-8 fuel in laboratory animals have not been identified. The goal of this study was to identify metabolic products from exposure to aerosolized S-8 and a designed straight-chain alkane/polyaromatic mixture (decane, undecane, dodecane, tridecane, tetradecane, pentadecane, naphthalene, and 2-methylnaphthalene) in male Fischer 344 rats. Collected blood and tissue samples were analyzed for 70 straight and branched alcohols and ketones ranging from 7 to 15 carbons. No fuel metabolites were observed in the blood, lungs, brain, and fat following S-8 exposure. Metabolites were detected in the liver, urine, and feces. Most of the metabolites were 2- and 3-position alcohols and ketones of prominent hydrocarbons with very few 1- or 4-position metabolites. Following exposure to the alkane mixture, metabolites were observed in the blood, liver, and lungs. Interestingly, heavy metabolites (3-tridecanone, 2-tridecanol, and 2-tetradecanol) were observed only in the lung tissues possibly indicating that metabolism occurred in the lungs. With the exception of these heavy metabolites, the metabolic profiles observed in this study are consistent with previous studies reporting on the metabolism of individual alkanes. Further work is needed to determine the potential metabolic interactions of parent, primary, and secondary metabolites and identify more polar metabolites. Some metabolites may have potential use as biomarkers of exposure to fuels.
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Affiliation(s)
- Raphael T Tremblay
- Interdisciplinary Toxicology Program, University of Georgia, Athens, GA, USA.
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Joo H, Choi K, Rose RL, Hodgson E. Inhibition of fipronil and nonane metabolism in human liver microsomes and human cytochrome P450 isoforms by chlorpyrifos. J Biochem Mol Toxicol 2007; 21:76-80. [PMID: 17427179 DOI: 10.1002/jbt.20161] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Previous studies have established that chlorpyrifos (CPS), fipronil, and nonane can all be metabolized by human liver microsomes (HLM) and a number of cytochrome P450 (CYP) isoforms. However, metabolic interactions between these three substrates have not been described. In this study the effect of either coincubation or preincubation of CPS with HLM or CYP isoforms with either fipronil or nonane as substrate was investigated. In both co- and preincubation experiments, CPS significantly inhibited the metabolism of fipronil or nonane by HLM although CPS inhibited the metabolism of fipronil more effectively than that of nonane. CPS significantly inhibited the metabolism of fipronil by CYP3A4 as well as the metabolism of nonane by CYP2B6. In both cases, preincubation with CPS caused greater inhibition than coincubation, suggesting that the inhibition is mechanism based.
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Affiliation(s)
- Hyun Joo
- Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, NC 27695, USA
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Hodgson E, Rose RL. The importance of cytochrome P450 2B6 in the human metabolism of environmental chemicals. Pharmacol Ther 2007; 113:420-8. [PMID: 17157385 DOI: 10.1016/j.pharmthera.2006.10.002] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2006] [Accepted: 10/05/2006] [Indexed: 10/24/2022]
Abstract
Cytochrome P450 (CYP) 2B6 (CYP2B6) is a human CYP isoform found in variable amounts in the liver and other organs. It is known to be inducible and polymorphic and has a wide range of xenobiotic substrates. Studies of CYP2B6 to date have concentrated heavily on clinical drugs. In the present communication, however, we concentrate on its role in the metabolism of environmental xenobiotics. The term environment is used, in its broadest sense, to include natural ecosystems and agroecosystems as well as the industrial and indoor domestic environments. In essence, this excludes only clinical drugs and drugs of abuse. Many of these chemicals, including agrochemicals and industrial chemicals, can serve as substrates, inhibitors and/or inducers of CYP2B6, these activities being often modified by the existence of polymorphic variants. Metabolism-based interactions between environmental chemicals are discussed, as well as the emerging possibility of metabolic interactions between environmental chemicals and clinical drugs.
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Affiliation(s)
- Ernest Hodgson
- Department of Environmental and Molecular Toxicology, North Carolina State University, NC 27695-7633, USA.
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Hodgson E, Rose RL. Human metabolic interactions of environmental chemicals. J Biochem Mol Toxicol 2007; 21:182-6. [DOI: 10.1002/jbt.20175] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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