Estrogenic effects of 17beta-aminoestrogens assessed in uteri of rats and mice.

摘要

Administration of exogenous estrogens has been associated with an increase of thromboembolic events. The 17beta-aminoestrogens produce anticoagulant effects contrasting with the procoagulant effects of the natural occurring estradiol in rodents. This work compares the estrogenic effects induced by 17beta-aminoestrogens prolame, butolame, pentolame, and estradiol in vivo models. Dose-response curves were performed using immature CD1 mice and Wistar rats. The animals were injected with estradiol or 17beta-aminoestrogens (0.01 to 1000 mug/kg), or vehicle. The uterine wet and dry weights were determined. The 17beta-aminoestrogens increased uterine weight in a dose-dependent manner. The uterotrophic effect produced by estradiol induced lower ED(50) (6.5 and 4 mug/kg) and higher E(max) values (+523-350%) in mice as compared with those from the rat, indicating more susceptibility of the mice model. The 17beta-aminoestrogens are partial estrogenic agonists with a relative uterotrophic effect of estradiol (100%) from 9-86%. Only the ED(50) values of 17beta-aminoestrogens in CD1 mice showed a direct correlation to the length of the amine group substitution in C-17 since their efficacy and potency were in the order: prolame>butolame>pentolame.