Prepubertal Daidzein Exposure Enhances Mammary Gland Differentiation and Regulates the Expression of Estrogen Receptor-Alpha and Apoptotic Proteins

الملخص EN

Mechanism of chemoprevention by daidzein (500 μg/g bwt) was examined by injecting it subcutaneously at 16th, 18th, and 20th day postpartum, followed by counting of terminal end buds (TEBs), terminal ducts (TDs), and lobules and immunohistochemistry of ER-α, Bcl2, Bax, and caspase-3.

DNA fragmentation was also analysed to measure the apoptosis level.

Estradiol benzoate (EB) (500 ng/g bwt) and dimethyl sulphoxide (DMSO) were used as reference and vehicle, respectively.

Observations show a significant enhancement of mammary gland differentiation at postnatal day 21 (PND21) as well as PND50.

There was a significant decrease of ER-α expression at PND21 and increase in its expression at PND50, in daidzein-treated animals.

The ratio of expression of Bcl-2 to Bax proteins increased at PND50 the same whereas, it decreased at PND50 due to daidzein.

An increased expression of caspase-3 and DNA fragmentation was also seen due to daidzein at PND50.

The mammary gland of EB-treated animals showed response a somewhat similar to that of daidzein-treated animals.