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Embryotoxic and teratogenic effects of the combination of bisphenol A and genistein on in vitro cultured postimplantation rat embryos. 2010

Lina Xing, and Yajun Xu, and Yang Xiao, and Lanqin Shang, and Ran Liu, and Xuetao Wei, and Jianjun Jiang, and Weidong Hao
Department of Toxicology, School of Public Health, Peking University, Beijing 100191, People's Republic of China.

The potential teratogenic effects and fetal toxicity of environmental estrogenic endocrine disruptors have become a great concern in recent years, and they have yet to be fully characterized. In the present study, the teratogenic effects of bisphenol A (BPA) and genistein (GEN) on rat embryos during their critical period of organogenesis were investigated using a whole-embryo culture experiment. The combined exposure effects of BPA and GEN were explored using a 4 x 4 full factorial design. Both BPA and GEN produced concentration-dependent inhibition of embryonic development, beginning at 32.0 and 10.0 microg/ml, respectively. Full factorial and isobologram analyses revealed a significant synergistic interaction between BPA and GEN for most end points (12 out of 20 tested), as indicated by the enhanced developmental toxicity of BPA after coexposure with different dose levels of GEN. In particular, serious malformations and a higher abnormal frequency of the central nervous system were induced by the combination of BPA and GEN. Our findings suggest that GEN may be embryotoxic and teratogenic to humans. BPA alone may not be a potential teratogen, but these two estrogenic chemicals have a synergistic effect on embryonic development when present together during the critical period of major organ formation. The current findings suggest that pregnant women should not take soy supplements, but more studies are necessary to provide a conclusive recommendation.

UI MeSH Term Description Entries
D010636 Phenols Benzene derivatives that include one or more hydroxyl groups attached to the ring structure.
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D004338 Drug Combinations Single preparations containing two or more active agents, for the purpose of their concurrent administration as a fixed dose mixture. Drug Combination,Combination, Drug,Combinations, Drug
D004622 Embryo, Mammalian The entity of a developing mammal (MAMMALS), generally from the cleavage of a ZYGOTE to the end of embryonic differentiation of basic structures. For the human embryo, this represents the first two months of intrauterine development preceding the stages of the FETUS. Embryonic Structures, Mammalian,Mammalian Embryo,Mammalian Embryo Structures,Mammalian Embryonic Structures,Embryo Structure, Mammalian,Embryo Structures, Mammalian,Embryonic Structure, Mammalian,Embryos, Mammalian,Mammalian Embryo Structure,Mammalian Embryonic Structure,Mammalian Embryos,Structure, Mammalian Embryo,Structure, Mammalian Embryonic,Structures, Mammalian Embryo,Structures, Mammalian Embryonic
D005260 Female Females
D000014 Abnormalities, Drug-Induced Congenital abnormalities caused by medicinal substances or drugs of abuse given to or taken by the mother, or to which she is inadvertently exposed during the manufacture of such substances. The concept excludes abnormalities resulting from exposure to non-medicinal chemicals in the environment. Drug-Induced Abnormalities,Abnormalities, Drug Induced,Abnormality, Drug-Induced,Drug Induced Abnormalities,Drug-Induced Abnormality
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001559 Benzhydryl Compounds Compounds which contain the methyl radical substituted with two benzene rings. Permitted are any substituents, but ring fusion to any of the benzene rings is not allowed. Diphenylmethyl Compounds,Compounds, Benzhydryl,Compounds, Diphenylmethyl
D013723 Teratogens An agent that causes the production of physical defects in the developing embryo. Embryotoxins,Fetotoxins,Teratogen

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