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Letrozole is an orally active, nonsteroidal, selective aromatase inhibitor and hence an antiestrogen. It prevents aromatase from producing estrogens by competitive, reversible binding to the heme of its cytochrome P450 unit. The action is specific, and letrozole does not reduce production of corticosteroids. [citation needed
Aromatase inhibitors affect the ability of estrogens production from androgens by inhibiting the aromatase enzyme activity which is a part of the estrogen pathway. [13] The two categories of AIs are based on their mechanism of action and structure.
Ovarian stimulation with the aromatase inhibitor letrozole has been proposed for ovulation induction in order to treat unexplained female infertility. In a multi-center study funded by the National Institute of Child Health and Development, ovarian stimulation with letrozole resulted in a significantly lower frequency of multiple gestation (i.e., twins or triplets) but also a lower frequency ...
Pages in category "Aromatase inhibitors" The following 76 pages are in this category, out of 76 total. This list may not reflect recent changes. ...
α-Naphthoflavone is a potent inhibitor of the enzyme aromatase, the enzyme that converts testosterone to estrogen. [ 1 ] [ 2 ] α-Naphthoflavone has been shown to cause abnormal testicular development in young chickens.
Aromatase inhibitors, which stop the production of estrogen in postmenopausal women, have become useful in the management of patients with breast cancer whose lesion was found to be estrogen receptor positive. [33] Inhibitors that are in current clinical use include anastrozole, exemestane, and letrozole.
Ursolic acid is a weak aromatase inhibitor (IC 50 = 32 μM), [8] and has been shown to increase the amount of muscle and brown fat and decrease white fat obesity and associated conditions when added to diets fed to mice. [9]
Exemestane is an irreversible, steroidal aromatase inactivator of type I, structurally related to the natural substrate 4-androstenedione. It acts as a false substrate for the aromatase enzyme, and is processed to an intermediate that binds irreversibly to the active site of the enzyme causing its inactivation, an effect also known as " suicide ...