Variations of progesterone receptor and c-fos gene expression in the rat uterus after treatment with norethisterone and its A-ring reduced metabolites.
Contraception
; 59(5): 339-43, 1999 May.
Article
em En
| MEDLINE
| ID: mdl-10494488
It has been suggested that some contraceptive derivatives of 19-nor-testosterone possess estrogenic activity that may facilitate the development of breast cancer. The aim of this work was to investigate the estrogenic properties of norethisterone (NET) and its A-ring-reduced derivatives by determining progesterone receptor (PR) and c-fos mRNA content of two estrogen-regulated genes in the uterus of ovariectomized rats. mRNA content was evaluated by Northern blot 1-6 h after 17 beta-estradiol administration. The highest PR and c-fos mRNA content was observed 3 h and 2 h after 17 beta-estradiol administration, respectively. NET did not modify either PR or c-fos mRNA content. In contrast, 5 alpha- and 3 beta, 5 alpha-NET significantly increased mRNA content of both genes. The increase in c-fos mRNA content induced by these reduced compounds was lower than that found with estradiol treatment. The overall results indicate that NET administration can indirectly induce estrogenic effects through the action of its 5 alpha-dihydro and 3 beta, 5 alpha-tetrahydro derivatives.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Útero
/
Receptores de Progesterona
/
Regulação da Expressão Gênica
/
Proteínas Proto-Oncogênicas c-fos
/
Genes fos
/
Anticoncepcionais Orais Sintéticos
/
Noretindrona
Limite:
Animals
Idioma:
En
Revista:
Contraception
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
México
País de publicação:
Estados Unidos