PMID: 11331651May 2, 2001Paper

Phytoestrogens and carcinogenesis-differential effects of genistein in experimental models of normal and malignant rat endometrium

Human Reproduction
P DielG Vollmer

Abstract

The phytoestrogen genistein was studied in normal and malignant experimental uterine models in vivo. The action of genistein on the uterus and vagina of ovariectomized DA/Han rats after 3 day oral administration (25, 50 or 100 mg/kg/BW/d) was compared to ethinyl oestradiol (0.1 mg/kg/BW/d). Effects on uterine and vaginal morphology, uterine growth and uterine gene expression were studied. A dose dependent increase of the uterine wet weight and the uterine and vaginal epithelial height, a dose dependent up-regulation of complement C3, down-regulation of clusterin mRNA expression and a stimulation of the vaginal cornification was observed after administration of genistein. Uterine gene expression and vaginal epithelium respond to genistein at doses where no significant effects on uterine wet weight were detectable. In general the vagina was more sensitive to genistein than the uterus. To analyse the action of genistein in malignant uterine tissue, the impact of a 28 d treatment with 50 mg/kg/d of genistein on the in-vivo tumour growth of RUCA I endometrial adenocarcinoma cells, following subcutaneous inoculation into syngeneic DA/Han rats, was assessed. In contrast to ethinyl oestradiol (0.1 mg/kg/BW/d), a dose of 50 mg/kg/BW/d o...Continue Reading

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