標題: In vivo formation of N7- guanine DNA adduct by safrole 2 ',3 '-oxide in mice
作者: Shen, Li-Ching
Chiang, Su-Yin
Lin, Ming-Huan
Chung, Wen-Sheng
Wu, Kuen-Yuh
應用化學系
Department of Applied Chemistry
關鍵字: Safrole 2 ',3 '-oxide;N7-(3-Benzo[1,3] dioxol-5-yl-2-hydroxypropyl)guanine;(N7 gamma-SFO-Gua);High performance liquid chromatography;electrospray ionization tandem mass;spectrometry (HPLC-ESI-MS/MS)
公開日期: 18-九月-2012
摘要: 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 ( N7 gamma-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. N7 gamma-SFO-Gua and [N-15(5)]-N7-(3-benzo[1,3] dioxol-5-yl-2-hydroxypropyl) guanine ([N-15(5)]-N7 gamma-SFO-Gua) were first synthesized, purified, and characterized. The HPLC-ESI-MS/MS method was developed to measure N7 gamma-SFO-Gua in calf thymus DNA treated with 60 mu mol 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 N7 gamma-SFO-Gua was 2670 adducts per 106 nucleotides. In urine of SFO-treated mice, the levels of N7 gamma- 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 N7 gamma-SFO-Gua, which may then be rapidly depurinated from the DNA backbone and excreted through urine. (c) 2012 Elsevier Ireland Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.toxlet.2012.07.006
http://hdl.handle.net/11536/16847
ISSN: 0378-4274
DOI: 10.1016/j.toxlet.2012.07.006
期刊: TOXICOLOGY LETTERS
Volume: 213
Issue: 3
起始頁: 309
結束頁: 315
顯示於類別:期刊論文


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