Effects of Neonatal Exposure to Diethylstilbestrol, Tamoxifen, and Toremifene on the BALB/c Mouse Mammary Gland
In this study, we compared the long-term effects of neonatal exposure to diethylstilbestrol (DES, 0.0125â50 μg), tamoxifen (TAM, 0.0125â50 μg), and toremifene (TOR, 53 μg) on mammary gland development and differentiation. Allometric growth of the mammary ducts was stimulated by neonatal DES e...
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Published in | Biology of reproduction Vol. 72; no. 2; pp. 423 - 435 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Madison, WI
Society for the Study of Reproduction
01.02.2005
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Subjects | |
Online Access | Get full text |
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Summary: | In this study, we compared the long-term effects of neonatal exposure to diethylstilbestrol (DES, 0.0125â50 μg), tamoxifen
(TAM, 0.0125â50 μg), and toremifene (TOR, 53 μg) on mammary gland development and differentiation. Allometric growth of the
mammary ducts was stimulated by neonatal DES exposure (12.5 μg) and impaired by exposure to TAM (25 μg). Neonatal treatment
with high doses of DES resulted in mammary ducts that displayed extensive dilatation and precocious lactogenesis in postpubertal,
nulliparous females. Initiation of this precocious differentiation coincided with the absence of corpora lutea, increased
levels of serum prolactin (PRL), and the induction of Prl mRNA expression within the mammary glands. Neonatal exposure to 1.25 μg TAM increased alveolar development in postpubertal,
nulliparous females similar to that recorded in females treated with low doses of DES. Lower doses of TAM did not affect alveolar
development, whereas branching morphogenesis and alveolar development were impaired by higher doses. Increased alveolar development
in females exposed to 1.25 μg TAM was associated with elevated serum progesterone (P) and increased alveolar development in
response to exogenous P. Taken together, our findings demonstrate that neonatal exposure to both DES and TAM exerts long-lasting
effects on the proliferation and differentiation of the mammary glands in female BALB/c, primarily as the result of endocrine
disruption
Abstract
Neonatal exposure to diethylstilbestrol or tamoxifen has dose-dependent effects on mammary function |
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ISSN: | 0006-3363 1529-7268 |
DOI: | 10.1095/biolreprod.104.029769 |