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Environment & Health

Dioxin exposure during pregnancy impairs mammary gland differentiation

Published in Women's Health Weekly, June 24th, 2004

Activation of aryl hydrocarbon receptors during pregnancy disrupts mammary gland differentiation, a study of dioxin-exposed mice revealed.

"Many ligands for the aryl hydrocarbon receptor (AhR) are considered endocrine disruptors and carcinogens, and assessment of adverse health effects in humans exposed to such chemicals has often focused on malignancies, including breast cancer. Mammary tissue contains the AhR, and inappropriate activation of the AhR during fetal development causes defects in mammary development that persist into adulthood. However, it is not known whether the extensive differentiation of mammary tissue that occurs during pregnancy is also sensitive to...

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