Effect of N,N-didesmethyltamoxifen upon DNA adduct formation by tamoxifen and α-hydroxytamoxifen
Effect of N,N-didesmethyltamoxifen upon DNA adduct formation by tamoxifen and α-hydroxytamoxifen
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N,N-二去甲基他莫昔芬对他莫昔芬和 α-羟基他莫昔芬 DNA 加合物形成的影响
DOI:
10.1016/j.canlet.2007.07.014
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发表时间:
2007
期刊:
影响因子:
9.7
通讯作者:
F. Beland
中科院分区:
文献类型:
--
作者:
G. Gamboa da Costa;M. Marques;Xin;M. Churchwell;Yu;D. Doerge;F. Beland
Tamoxifen undergoes sequential metabolism to N-desmethyltamoxifen and N,N-didesmethyltamoxifen. Whereas N-desmethyltamoxifen is a major metabolite in humans, nonhuman primates, and rats, appreciable concentrations of N,N-didesmethyltamoxifen are formed in humans and nonhuman primates but not in rats. This difference in the extent of N,N-didesmethyltamoxifen formation may be important because it has been proposed that N,N-didesmethyltamoxifen inhibits the cytochrome P450 (CYP)-catalyzed α-hydroxylation of tamoxifen and resultant tamoxifen–DNA adduct formation. To test this hypothesis directly, we compared the extent of tamoxifen–DNA adduct formation in rats co-administered 27μmol N,N-didesmethyltamoxifen per kg body weight and either 27μmol tamoxifen per kg body weight or 27μmol α-hydroxytamoxifen per kg body weight daily for 7days. Female Sprague–Dawley rats treated with N,N-didesmethyltamoxifen had a 44% decrease (p >0.05) in CYP 3A2 content (the CYP isoform responsible for tamoxifen α-hydroxylation), an 18% decrease (p =0.010) in CYP 3A activity, and higher blood levels of tamoxifen and N-desmethyltamoxifen compared to rats treated with solvent. Total tamoxifen–DNA adduct levels were 4.1-fold higher (p <0.001) in rats given α-hydroxytamoxifen as compared to tamoxifen. N,N-Didesmethyltamoxifen treatment caused a 1.2-fold increase in total tamoxifen–DNA adduct levels with both tamoxifen and α-hydroxytamoxifen, a difference that was not significant. These results indicate that, with this experimental model, N,N-didesmethyltamoxifen does not impair the metabolism of tamoxifen to a reactive electrophile.
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影响因子:
4.1
作者:
Kim,SungYeon;Suzuki,Naomi;SantoshLaxmi,YR;Rieger,Robert;Shibutani,Shinya
通讯作者:
Shibutani,Shinya
影响因子:
4.1
作者:
S. Shibutani;N. Suzuki;I. Terashima;Steven Sugarman;A. P. Grollman;Michael L. Pearl
通讯作者:
S. Shibutani;N. Suzuki;I. Terashima;Steven Sugarman;A. P. Grollman;Michael L. Pearl
DOI:
--
发表时间:
1993
期刊:
Drug metabolism and disposition: the biological fate of chemicals
影响因子:
--
作者:
Mani,C;Gelboin,HV;Park,SS;Pearce,R;Parkinson,A;Kupfer,D
通讯作者:
Kupfer,D
DOI:
10.1002/jbt.2570090204
发表时间:
1994
期刊:
Journal of biochemical toxicology
影响因子:
--
作者:
Howard,PC;McManus,ME;Koop,DR
通讯作者:
Koop,DR
DOI:
--
发表时间:
2003
期刊:
Cancer research.
影响因子:
--
作者:
Shibutani,Shinya;Suzuki,Naomi;Laxmi,YRSantosh;Schild,LauraJ;Divi,RaoL;Grollman,ArthurP;Poirier,MiriamC
通讯作者:
Poirier,MiriamC