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- W2099008462 abstract "Bisphenol A (BPA), known as an environmental endocrine disruptor, is widely used as a plasticizer. This study aims to investigate whether exposure in utero to BPA alters the architecture, proliferative index, and genomic signature of the rat mammary gland during critical stages of development. Pregnant rats were gavaged with 25 μg BPA/kg body weight (BW; low-dose group) or 250 μg BPA/kg BW (high-dose group) from day 10 post-conception to delivery. Female litters were euthanized at 21, 35, 50, and 100 days, and mammary glands were collected. Analysis of gland morphology was performed from whole-mounted mammary tissue, while proliferative index was determined by detection of bromodeoxyuridine incorporation in the epithelial cells. Genomic profiles were obtained by microarray analysis, and some genes were validated by real-time RT-PCR. BPA exposure induced changes in the mammary gland that were time and dose specific. High-dose exposure resulted in architectural modifications, mainly in the number of undifferentiated epithelial structures of the breast tissue. Proliferative index did not show remarkable differences by the effect of BPA. Low and high doses of BPA changed the gene expression signature of the mammary gland following a different fashion: low dose had the highest effect by 50 days, while high dose had a highest influence on gene expression by 100 days. Both doses presented a significant cluster of up-modulated genes related to the immune system at the age of maximal changes. Moreover, high-dose exposure induced changes in genes related to differentiation suggesting alterations in the normal development of the gland. The increase of undifferentiated structures and the changes in the gene expression profile at different ages suggest that prenatal exposure to BPA can affect the susceptibility of the mammary gland to transformation." @default.
- W2099008462 created "2016-06-24" @default.
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- W2099008462 date "2007-10-10" @default.
- W2099008462 modified "2023-09-27" @default.
- W2099008462 title "Effect of prenatal exposure to the endocrine disruptor bisphenol A on mammary gland morphology and gene expression signature" @default.
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- W2099008462 doi "https://doi.org/10.1677/joe-07-0056" @default.
- W2099008462 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18180321" @default.
- W2099008462 hasPublicationYear "2007" @default.
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