Species variation in the bioactivation of tacrine by hepatic microsomes.
Species variation in the bioactivation of tacrine by hepatic microsomes.
复制标题
肝微粒体对他克林生物活化的物种变异。
DOI:
10.3109/00498259509061837
复制
发表时间:
1995
期刊:
影响因子:
--
通讯作者:
B. Park
中科院分区:
文献类型:
--
作者:
S. Madden;V. Spaldin;R. Hayes;T. Woolf;W. Pool;B. Park
1. The metabolite profile of tacrine (1,2,3,4-tetrahydro-9-amino acridine) was similar in hepatic microsomes from man, rat, dog, rabbit, mouse and hamster. Major metabolites were 1-, 2-, 4- and 7-OH tacrine. Only quantitative differences in metabolite profile were evident between species. 2. Bioactivation to protein-reactive metabolite(s) was seen in microsomes from all species. 3. 7-Methyl tacrine was found to undergo significantly less bioactivation than either 7-OH tacrine or tacrine itself. 4. In the presence of hepatic microsomes and thiol-containing agents protein-reactive metabolite formation was significantly reduced. With mercaptoethanol present a stable thioether adduct was generated from both tacrine and 7-OH tacrine. 5. Analysis of the thioether adduct by mass spectrometry yielded a molecular ion of m/z 290 consistent with the presence of a covalent adduct of 7-OH tacrine complexed in a 1:1 molar ratio with mercaptoethanol. 6. We have therefore provided further evidence for a two-step mechanism in the bioactivation of tacrine involving an initial 7-hydroxylation followed by a postulated 2-electron oxidation to yield a reactive quinone methide. This mechanism of bioactivation appears to be identical in human and animal hepatic microsomes.
DOI:
--
发表时间:
1993
期刊:
Drug metabolism and disposition: the biological fate of chemicals
影响因子:
--
作者:
Woolf,TF;Pool,WF;Bjorge,SM;Chang,T;Goel,OP;Purchase2nd,CF;Schroeder,MC;Kunze,KL;Trager,WF
通讯作者:
Trager,WF
DOI:
10.1111/j.1600-0773.1991.tb01298.x
发表时间:
1991
期刊:
Pharmacology & toxicology
影响因子:
--
作者:
Willson,RA;Hart,J;Hall,T
通讯作者:
Hall,T
DOI:
10.1073/pnas.81.5.1327
发表时间:
1984-01-01
期刊:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子:
--
作者:
DAHLIN, DC;MIWA, GT;NELSON, SD
通讯作者:
NELSON, SD