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Aromatase is the enzyme that catalyzes a key aromatization step in the synthesis of estrogen. It converts the enone ring of androgen precursors such as testosterone, to a phenol, completing the synthesis of estrogen. As such, AIs are estrogen synthesis inhibitors. Because hormone-positive breast and ovarian cancers are dependent on estrogen for ...
Antiestrogens, also known as estrogen antagonists or estrogen blockers, are a class of drugs which prevent estrogens like estradiol from mediating their biological effects in the body. They act by blocking the estrogen receptor (ER) and/or inhibiting or suppressing estrogen production .
The main source of estrogen is the ovaries in premenopausal women, while in post-menopausal women most of the body's estrogen is produced via the conversion of androgens into estrogen by the aromatase enzyme in the peripheral tissues (i.e. adipose tissue like that of the breast) and a number of sites in the brain. Estrogen is produced locally ...
Atypical (dual estrogen and nitrogen mustard alkylating antineoplastic): Estramustine phosphate sodium (Emcyt) – 140 mg; Oral estradiol valerate (except in combination with dienogest as an oral contraceptive) is not available in the U.S. and is used primarily in Europe. [2]
Selective estrogen receptor modulators (SERMs), also known as estrogen receptor agonists/antagonists (ERAAs), [1] [2] are a class of drugs that act on estrogen receptors (ERs). [3] Compared to pure ER agonists – antagonists (e.g., full agonists and silent antagonists ), SERMs are more tissue-specific, allowing them to selectively inhibit or ...
Enclomifene (INN Tooltip International Nonproprietary Name), or enclomiphene (USAN Tooltip United States Adopted Name), a nonsteroidal selective estrogen receptor modulator of the triphenylethylene group, acts by antagonizing the estrogen receptor (ER) in the pituitary gland, which reduces negative feedback by estrogen on the hypothalamic-pituitary-gonadal axis, thereby increasing gonadotropin ...