Chemical Synthesis of Six Novel 17β-Estradiol and Estrone Dimers and Study of Their Formation Catalyzed by Human Cytochrome P450 Isoforms
摘要:
Our earlier studies have shown that over 20 nonpolar 17 beta-estradiol metabolite peaks were detected following incubations of radioactive 17 beta-estradiol with human liver microsomes or recombinant human cytochrome P450 isoforms in the presence of NADPH as a cofactor. The structures of two representative nonpolar metabolites were identified earlier as dimers of 17 beta-estradiol linked through a diaryl ether bond between the C-3 phenolic oxygen of one molecule and the C-2 or C-4 aromatic carbon of another. Six additional putative dimers between estrone and 17 beta-estradiol with structures similar to the two identified ones were synthesized in this study. Using these newly synthesized estrogen dimers as reference standards, we demonstrated that incubations of human liver microsomes or various human cytochrome P450 isoforms with estrone or 17-estradiol alone or two estrogens in combination in the presence of NADPH as a cofactor resulted in the formation of all eight estrogen dimers in varying quantities.