Biochemical and biological characterization of a novel anti-aromatase coumarin derivative.

The Journal of Biological Chemistry
Shiuan ChenYate-Ching Yuan

Abstract

Estrogen stimulates the proliferation of estrogen receptor (ER)-positive breast cancer cells. Aromatase is the enzyme responsible for the conversion of androgens into estrogens, and synthetic aromatase inhibitors such as letrozole, anastrozole, and exemestane have proven to be effective endocrine regimens for ER-positive breast cancer. In a recent study, we have found that 4-benzyl-3-(4'-chlorophenyl)-7-methoxycoumarin is a potent competitive inhibitor of aromatase with respect to the androgen substrate. Its K(i) value was determined to be 84 nm, significantly more potent than several known aromatase inhibitors. The specific interaction of this compound with aromatase was further demonstrated by the reduction of its binding by several mutations at the active site region of aromatase and evaluated by computer modeling analysis. The structure-activity studies have revealed that three functional groups (i.e. 3-(4'-chlorophenyl), 4-benzyl, and 7-methoxyl) of this coumarin are important in its inhibition of aromatase. In addition, through a matrigel thread three-dimensional cell culture, this compound was shown to behave like known aromatase inhibitors that suppress the proliferation of aromatase and estrogen receptor positive MCF-7...Continue Reading

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