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Responses of estrogen sensitive tissues in female Wistar rats to pre- and postnatal isoflavone exposure.

Abstract：

:Effects of isoflavones on estrogen sensitive tissues are discussed controversially. This study was designed to investigate tissue specific effects of an isoflavone exposure through different periods of life in female Wistar rats and to compare the effects of genistein (GEN) to those of mixed dietary isoflavones, GEN and daidzein (DAI). One group received an isoflavone-free diet (IDD), another was fed an isoflavone-rich diet (IRD) and the third group an IDD supplemented with GEN (GEN(d)) prior to mating, throughout pregnancy and up to weaning. The offspring were kept on the respective diets during growth, puberty and adulthood. The weight of the uterus, the height of the uterine and vaginal epithelium, the bone mineral density of the tibia, and the expression of the estrogen sensitive gene CaBP9K in the liver were determined. At d21, the uterine weight, the uterine epithelium and the expression of CaBP9K in the liver were significantly stimulated in GEN(d) animals compared to IDD and IRD. Interestingly, bone mineral density was increased in GEN(d) and in IRD animals. Around puberty (d50) neither uterine wet weights nor trabecular bone density differed significantly among the isoflavone groups and the IDD control. At d80 no significant differences in uterine weight were observed among IDD, GEN(d) and IRD animals. However, bone mineral density was increased in GEN(d) and IRD animals. In summary, our results demonstrate that lifelong dietary exposure to isoflavones can affect estrogen sensitive tissues, apparently in a tissue selective manner. With respect to health risk and benefit our data indicate that an increased bone mineral density can be achieved by lifelong exposure to an IRD, which, in contrast to GEN supplementation, does not seem to stimulate the proliferation of the uterine epithelium.

journal_name

Toxicol Lett

journal_title

Toxicology letters

authors

Hertrampf T,Ledwig C,Kulling S,Molzberger A,Möller FJ,Zierau O,Vollmer G,Moors S,Degen GH,Diel P

doi

10.1016/j.toxlet.2009.08.019

subject

Has Abstract

pub_date

2009-12-15 00:00:00

pages

181-8

issue

2-3

eissn

0378-4274

issn

1879-3169

pii

S0378-4274(09)01417-9

journal_volume

191

pub_type

杂志文章

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