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Estrogen Receptor (ER)



The estrogen receptor (ER) is a protein that binds to estrogen that enters the cell. Estrogen is a steroid (lipid) hormone produced by the ovaries. The combination of protein and hormone then acts as a transcription factor to turn on genes that enable the target cells to divide. The receptor is active in the cells of the female reproductive organs, such as breasts and ovaries.
Estrogen is a small hydrophobic molecule and it enters cells by crossing through the lipid membrane. Once in the cell, the estrogen binds to its receptor the complex binds to DNA in the nucleus causing genes to be transcribed.
Several drugs have been developed to try to block the gene-activating function of estrogen. A commonly prescribed example is tamoxifen, a drug that partially inhibits the activity of estrogen. 
These drugs should slow the growth of cancers that are growing in response to the presence of estrogen and its receptor. 

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