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Title: A comparative study on the protective effects of 17β-estradiol, biochanin A and bisphenol A on mammary gland differentiation and tumorigenesis in rats
Authors: Yin, Hong
Ito, Akihiro
Bhattacharjee, Dilip
Hoshi, Masaharu
Keywords: Biochanin A;Bisphenol A;17-β-estradiol;Mammary gland differentiation;Mammary tumorigenesis
Issue Date: Jul-2006
Publisher: CSIR
Abstract: Mammary tissue differentiation and tumorigenesis were studied in female rats following subcutaneous injection at 2, 4 and 6 days after birth with low or high doses of 17β-estradiol (0.1 or 10 µg; E2), biochanin A (0.1 or 10 mg; BCA) or bisphenol A (0.1 or 10.0 mg; BPA). Half of the rats were killed on day 35 to analyze the terminal end bud (TEB), terminal duct (TD) and alveolar bud (AB) of the mammary tissue. The remaining rats were injected, ip, with a dose of 50 mg/kg of N-nitroso-N-methylurea (MNU) at 7 weeks of age and sacrificed 26 weeks later. The incidence and multiplicity of mammary tumors (MT) decreased among all three different treated groups, dose-dependently. However, the pattern of mammary gland differentiation varied. No significant difference was observed after E2 administration. TEB decreased dose-dependently in BCA treated groups and the number of TD and AB were suppressed significantly in BPA high dose group.
Page(s): 540-546
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.44(07) [July 2006]

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