Estrogenic effects of 17 beta-aminoestrogens assessed in uteri of rats and mice.
Eur J Pharmacol
; 510(3): 235-9, 2005 Mar 14.
Article
em En
| MEDLINE
| ID: mdl-15763248
ABSTRACT
Administration of exogenous estrogens has been associated with an increase of thromboembolic events. The 17 beta-aminoestrogens produce anticoagulant effects contrasting with the procoagulant effects of the natural occurring estradiol in rodents. This work compares the estrogenic effects induced by 17 beta-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 17 beta-aminoestrogens (0.01 to 1000 microg/kg), or vehicle. The uterine wet and dry weights were determined. The 17 beta-aminoestrogens increased uterine weight in a dose-dependent manner. The uterotrophic effect produced by estradiol induced lower ED50 (6.5 and 4 microg/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 17 beta-aminoestrogens are partial estrogenic agonists with a relative uterotrophic effect of estradiol (100%) from 9-86%. Only the ED50 values of 17 beta-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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Útero
/
Congêneres do Estradiol
Limite:
Animals
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article