medroxyprogesterone

Definition / meaning of medroxyprogesterone

A synthetic derivative of progesterone administered as an acetate salt (medroxyprogesterone acetate) with antiestrogenic activity. As a do all progestins, medroxyprogesterone binds to and activates nuclear receptors which subsequently bind to and activate target genes for transcription. As an antiestrogen, this agent may inhibit the growth-stimulating effects of estrogen on estrogen-sensitive tumor cells.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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