1
|
Kirman C, Hays S. Derivation of endogenous equivalent values to support risk assessment and risk management decisions for an endogenous carcinogen: Ethylene oxide. Regul Toxicol Pharmacol 2017; 91:165-172. [DOI: 10.1016/j.yrtph.2017.10.032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 09/08/2017] [Accepted: 10/26/2017] [Indexed: 01/26/2023]
|
3
|
Erraguntla NK, Grant RL. Health- and vegetative-based effect screening values for ethylene. Chem Biol Interact 2015; 241:87-93. [DOI: 10.1016/j.cbi.2015.02.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
4
|
Gavina JMA, Yao C, Feng YL. Recent developments in DNA adduct analysis by mass spectrometry: a tool for exposure biomonitoring and identification of hazard for environmental pollutants. Talanta 2014; 130:475-94. [PMID: 25159438 DOI: 10.1016/j.talanta.2014.06.050] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 06/19/2014] [Accepted: 06/22/2014] [Indexed: 02/08/2023]
Abstract
DNA adducts represent an important category of biomarkers for detection and exposure surveillance of potential carcinogenic and genotoxic chemicals in the environment. Sensitive and specific analytical methods are required to detect and differentiate low levels of adducts from native DNA from in vivo exposure. In addition to biomonitoring of environmental pollutants, analytical methods have been developed for structural identification of adducts which provides fundamental information for determining the toxic pathway of hazardous chemicals. In order to achieve the required sensitivity, mass spectrometry has been increasingly utilized to quantify adducts at low levels as well as to obtain structural information. Furthermore, separation techniques such as chromatography and capillary electrophoresis can be coupled to mass spectrometry to increase the selectivity. This review will provide an overview of advances in detection of adducted and modified DNA by mass spectrometry with a focus on the analysis of nucleosides since 2007. Instrument advances, sample and instrument considerations, and recent applications will be summarized in the context of hazard assessment. Finally, advances in biomonitoring applying mass spectrometry will be highlighted. Most importantly, the usefulness of DNA adducts measurement and detection will be comprehensively discussed as a tool for assessment of in vitro and in vivo exposure to environmental pollutants.
Collapse
Affiliation(s)
- Jennilee M A Gavina
- Exposure and Biomonitoring Division, Environmental Health Science and Research Bureau, Environmental and Radiation Health Sciences Directorate, Healthy Environments and Consumer Safety Branch, Health Canada, 50 Columbine Driveway, AL: 0800C, Ottawa, Ontario, Canada K1A 0K9
| | - Chunhe Yao
- Exposure and Biomonitoring Division, Environmental Health Science and Research Bureau, Environmental and Radiation Health Sciences Directorate, Healthy Environments and Consumer Safety Branch, Health Canada, 50 Columbine Driveway, AL: 0800C, Ottawa, Ontario, Canada K1A 0K9
| | - Yong-Lai Feng
- Exposure and Biomonitoring Division, Environmental Health Science and Research Bureau, Environmental and Radiation Health Sciences Directorate, Healthy Environments and Consumer Safety Branch, Health Canada, 50 Columbine Driveway, AL: 0800C, Ottawa, Ontario, Canada K1A 0K9.
| |
Collapse
|
5
|
Shen LC, Chiang SY, Lin MH, Chung WS, Wu KY. In vivo formation of N7-guanine DNA adduct by safrole 2',3'-oxide in mice. Toxicol Lett 2012; 213:309-15. [PMID: 22820429 DOI: 10.1016/j.toxlet.2012.07.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 07/06/2012] [Accepted: 07/09/2012] [Indexed: 12/24/2022]
Abstract
Safrole, a naturally occurring product derived from spices and herbs, has been shown to be associated with the development of hepatocellular carcinoma in rodents. Safrole 2',3'-oxide (SFO), an electrophilic metabolite of safrole, was shown to react with DNA bases to form detectable DNA adducts in vitro, but not detected in vivo. Therefore, the objective of this study was to investigate the formation of N7-(3-benzo[1,3]dioxol-5-yl-2-hydroxypropyl)guanine (N7γ-SFO-Gua) resulting from the reaction of SFO with the most nucleophilic site of guanine in vitro and in vivo with a newly developed isotope-dilution high performance liquid chromatography electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS) method. N7γ-SFO-Gua and [(15)N(5)]-N7-(3-benzo[1,3]dioxol-5-yl-2-hydroxypropyl)guanine ([(15)N(5)]-N7γ-SFO-Gua) were first synthesized, purified, and characterized. The HPLC-ESI-MS/MS method was developed to measure N7γ-SFO-Gua in calf thymus DNA treated with 60 μmol of SFO for 72 h and in urine samples of mice treated with a single dose of SFO (30 mg/kg body weight, intraperitoneally). In calf thymus DNA, the level of N7γ-SFO-Gua was 2670 adducts per 10(6)nucleotides. In urine of SFO-treated mice, the levels of N7γ-SFO-Gua were 1.02±0.14 ng/mg creatinine (n=4) on day 1, 0.73±0.68 ng/mg creatinine (n=4) on day 2, and below the limit of quantitation on day 3. These results suggest that SFO can cause in vivo formation of N7γ-SFO-Gua, which may then be rapidly depurinated from the DNA backbone and excreted through urine.
Collapse
Affiliation(s)
- Li-Ching Shen
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30050, Taiwan
| | | | | | | | | |
Collapse
|
6
|
Li Q, Csanády GA, Kessler W, Klein D, Pankratz H, Pütz C, Richter N, Filser JG. Kinetics of ethylene and ethylene oxide in subcellular fractions of lungs and livers of male B6C3F1 mice and male fischer 344 rats and of human livers. Toxicol Sci 2011; 123:384-98. [PMID: 21785163 PMCID: PMC3179684 DOI: 10.1093/toxsci/kfr194] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Accepted: 07/13/2011] [Indexed: 12/01/2022] Open
Abstract
Ethylene (ET) is metabolized in mammals to the carcinogenic ethylene oxide (EO). Although both gases are of high industrial relevance, only limited data exist on the toxicokinetics of ET in mice and of EO in humans. Metabolism of ET is related to cytochrome P450-dependent mono-oxygenase (CYP) and of EO to epoxide hydrolase (EH) and glutathione S-transferase (GST). Kinetics of ET metabolism to EO and of elimination of EO were investigated in headspace vessels containing incubations of subcellular fractions of mouse, rat, or human liver or of mouse or rat lung. CYP-associated metabolism of ET and GST-related metabolism of EO were found in microsomes and cytosol, respectively, of each species. EH-related metabolism of EO was not detectable in hepatic microsomes of rats and mice but obeyed saturation kinetics in hepatic microsomes of humans. In ET-exposed liver microsomes, metabolism of ET to EO followed Michaelis-Menten-like kinetics. Mean values of V(max) [nmol/(min·mg protein)] and of the apparent Michaelis constant (K(m) [mmol/l ET in microsomal suspension]) were 0.567 and 0.0093 (mouse), 0.401 and 0.031 (rat), and 0.219 and 0.013 (human). In lung microsomes, V(max) values were 0.073 (mouse) and 0.055 (rat). During ET exposure, the rate of EO production decreased rapidly. By modeling a suicide inhibition mechanism, rate constants for CYP-mediated catalysis and CYP inactivation were estimated. In liver cytosol, mean GST activities to EO expressed as V(max)/K(m) [μl/(min·mg protein)] were 27.90 (mouse), 5.30 (rat), and 1.14 (human). The parameters are most relevant for reducing uncertainties in the risk assessment of ET and EO.
Collapse
Affiliation(s)
- Qiang Li
- Institute of Toxicology, German Research Center for Environmental Health, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
- Institut für Toxikologie und Umwelthygiene, Technische Universität München, D-80802 München, Germany
| | - György András Csanády
- Institute of Toxicology, German Research Center for Environmental Health, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
- Institut für Toxikologie und Umwelthygiene, Technische Universität München, D-80802 München, Germany
| | - Winfried Kessler
- Institute of Toxicology, German Research Center for Environmental Health, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
| | - Dominik Klein
- Institute of Toxicology, German Research Center for Environmental Health, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
- Institut für Toxikologie und Umwelthygiene, Technische Universität München, D-80802 München, Germany
| | - Helmut Pankratz
- Institut für Rechtsmedizin, Ludwig-Maximilians-Universität München, D-80336 München, Germany
| | - Christian Pütz
- Institute of Toxicology, German Research Center for Environmental Health, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
| | - Nadine Richter
- Institute of Toxicology, German Research Center for Environmental Health, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
- Institut für Toxikologie und Umwelthygiene, Technische Universität München, D-80802 München, Germany
| | - Johannes Georg Filser
- Institute of Toxicology, German Research Center for Environmental Health, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
- Institut für Toxikologie und Umwelthygiene, Technische Universität München, D-80802 München, Germany
| |
Collapse
|