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Time course evaluation of N-nitrosodialkylamines-induced DNA alkylation and oxidation in liver of mosquito fish

Abstract

Here we simultaneously measured N7-alkylguanines and 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) in liver of small fish, respectively, to assess the time course of the formation and removal of alkylation and oxidative damage to DNA caused by N-nitrosodialkylamines. Mosquito fish (Gambusia affinis) were killed at various times during (4 days) and post-exposure (16 days) to N-nitrosodimethylamine (NDMA) and N-nitrosodiethylamine (NDEA) alone or their combination with concentrations of 10 and 50 mg/l. The modified guanine adducts were sensitively and selectively quantitated by isotope-dilution LC-MS/MS methods. During exposure, N7-methylguanine (N7-MeG) and N7-ethylguanine (N7-EtG) in liver DNA increased with the duration and dose of N-nitrosodialkylamine exposure, while 8-oxodG was dose-dependently induced within 1 day. It was found that NDMA formed substantially more N7-alkylated guanines and 8-oxodG than NDEA on the basis of adducts formed per micromolar concentration, suggesting that NDMA can be more easily bioactivated than NDEA to form reactive alkylating agents with the concomitant formation of oxygen radicals. After cessation of exposure, N7-alkylguanines remained elevated for 1 day and then gradually decreased over time but still higher than the background levels, even at day 16 (half-lives of 7-8 days). However, 8-oxodG was excised quickly from liver DNA and returned to the background level within 4 days  More>>
Authors:
Chao, M -R; [1]  Institute of Medical and Molecular Toxicology, Chung Shan Medical University, Taichung 402, Taiwan (China)]; Chang, Y -Z; [2]  Wong, R -H; [3]  Hu, C.-W. , E-mail: windyhu@csmu.edu.tw [3] 
  1. Department of Occupational Safety and Health, Chung Shan Medical University, Taichung 402, Taiwan (China)
  2. Institute of Medical and Molecular Toxicology, Chung Shan Medical University, Taichung 402, Taiwan (China)
  3. Department of Public Health, Chung Shan Medical University, Taichung 402, Taiwan (China)
Publication Date:
Jan 15, 2009
Product Type:
Journal Article
Resource Relation:
Journal Name: Mutation Research; Journal Volume: 660; Journal Issue: 1-2; Other Information: DOI: 10.1016/j.mrfmmm.2008.10.004; PII: S0027-5107(08)00229-7; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Subject:
60 APPLIED LIFE SCIENCES; ALKYLATING AGENTS; ALKYLATION; DNA; DNA ADDUCTS; GUANINE; HALF-LIFE; IN VIVO; ISOTOPE DILUTION; LIVER; MOSQUITOES; NITROSAMINES; OXIDATION
OSTI ID:
21178878
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0027-5107; MUREAV; TRN: NL09R3972053081
Availability:
Available from http://dx.doi.org/10.1016/j.mrfmmm.2008.10.004;INIS
Submitting Site:
NLN
Size:
page(s) 33-39
Announcement Date:
Jul 17, 2009

Citation Formats

Chao, M -R, Institute of Medical and Molecular Toxicology, Chung Shan Medical University, Taichung 402, Taiwan (China)], Chang, Y -Z, Wong, R -H, and Hu, C.-W. , E-mail: windyhu@csmu.edu.tw. Time course evaluation of N-nitrosodialkylamines-induced DNA alkylation and oxidation in liver of mosquito fish. Netherlands: N. p., 2009. Web. doi:10.1016/j.mrfmmm.2008.10.004.
Chao, M -R, Institute of Medical and Molecular Toxicology, Chung Shan Medical University, Taichung 402, Taiwan (China)], Chang, Y -Z, Wong, R -H, & Hu, C.-W. , E-mail: windyhu@csmu.edu.tw. Time course evaluation of N-nitrosodialkylamines-induced DNA alkylation and oxidation in liver of mosquito fish. Netherlands. doi:10.1016/j.mrfmmm.2008.10.004.
Chao, M -R, Institute of Medical and Molecular Toxicology, Chung Shan Medical University, Taichung 402, Taiwan (China)], Chang, Y -Z, Wong, R -H, and Hu, C.-W. , E-mail: windyhu@csmu.edu.tw. 2009. "Time course evaluation of N-nitrosodialkylamines-induced DNA alkylation and oxidation in liver of mosquito fish." Netherlands. doi:10.1016/j.mrfmmm.2008.10.004. https://www.osti.gov/servlets/purl/10.1016/j.mrfmmm.2008.10.004.
@misc{etde_21178878,
title = {Time course evaluation of N-nitrosodialkylamines-induced DNA alkylation and oxidation in liver of mosquito fish}
author = {Chao, M -R, Institute of Medical and Molecular Toxicology, Chung Shan Medical University, Taichung 402, Taiwan (China)], Chang, Y -Z, Wong, R -H, and Hu, C.-W. , E-mail: windyhu@csmu.edu.tw}
abstractNote = {Here we simultaneously measured N7-alkylguanines and 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) in liver of small fish, respectively, to assess the time course of the formation and removal of alkylation and oxidative damage to DNA caused by N-nitrosodialkylamines. Mosquito fish (Gambusia affinis) were killed at various times during (4 days) and post-exposure (16 days) to N-nitrosodimethylamine (NDMA) and N-nitrosodiethylamine (NDEA) alone or their combination with concentrations of 10 and 50 mg/l. The modified guanine adducts were sensitively and selectively quantitated by isotope-dilution LC-MS/MS methods. During exposure, N7-methylguanine (N7-MeG) and N7-ethylguanine (N7-EtG) in liver DNA increased with the duration and dose of N-nitrosodialkylamine exposure, while 8-oxodG was dose-dependently induced within 1 day. It was found that NDMA formed substantially more N7-alkylated guanines and 8-oxodG than NDEA on the basis of adducts formed per micromolar concentration, suggesting that NDMA can be more easily bioactivated than NDEA to form reactive alkylating agents with the concomitant formation of oxygen radicals. After cessation of exposure, N7-alkylguanines remained elevated for 1 day and then gradually decreased over time but still higher than the background levels, even at day 16 (half-lives of 7-8 days). However, 8-oxodG was excised quickly from liver DNA and returned to the background level within 4 days post-exposure (half-lives less than 2 days). Taken together, this study firstly demonstrated that in addition to alkylation, N-nitrosodialkylamines can concurrently cause oxidative damage to DNA in vivo.}
doi = {10.1016/j.mrfmmm.2008.10.004}
journal = {Mutation Research}
issue = {1-2}
volume = {660}
place = {Netherlands}
year = {2009}
month = {Jan}
}