Genotoxicity of the isoflavones genistein, daidzein and equol in V79 cells.

Abstract:

:Hormonally active chemicals in the human diet, such as man-made estrogenic chemicals or plant-derived compounds (phytoestrogens), have become a matter of public concern. A significant part of human exposure to phytoestrogens is attributable to soy isoflavones. Besides their estrogenic properties, soy isoflavones also exert genotoxic actions. In this paper, the micronucleus (MN) assay in V79 cells was used to study chromosomal genotoxicity. Genistein caused a clear dose-related induction of MN within the range of 5-25 microM; MN rates were declining at higher genistein concentrations. This was probably due to cytotoxicity of genistein since reduced neutral red uptake and MTT formation with an IC(50) of about 75 microM occurred. Daidzein induced a comparatively shallow increase in the number of MN between 25 and 100 microM. In contrast, the daidzein metabolite equol caused an increase in the number of MN up to 25 microM with no further increase at higher concentrations. Additional staining with anti-kinetochore (CREST) antibodies served to determine if the micronuclei contain whole chromosomes or acentric fragments. Genistein induced mostly CREST(-) micronuclei, i.e. MN with chromosomal fragments, thus indicative of a clastogenic mode of action. MN induced by high concentrations of daidzein were partly CREST(+) and CREST(-), whilst equol induced mostly CREST(+) micronuclei indicative of an aneugenic action. These results point to a differential genotoxicity of phytoestrogens.

journal_name

Toxicol Lett

journal_title

Toxicology letters

authors

Di Virgilio AL,Iwami K,Wätjen W,Kahl R,Degen GH

doi

10.1016/j.toxlet.2004.04.005

keywords:

subject

Has Abstract

pub_date

2004-06-15 00:00:00

pages

151-62

issue

1

eissn

0378-4274

issn

1879-3169

pii

S0378427404002139

journal_volume

151

pub_type

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