Journal
JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
Volume 33, Issue 1, Pages 743-754Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14756366.2018.1452919
Keywords
3-Phenylcoumarin; 17-beta-hydroxysteroid dehydrogenase 1 (HSD1); 3-imidazolecoumarin; aromatase; structure-activity relationship (SAR)
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A comprehensive set of 3-phenylcoumarin analogues with polar substituents was synthesised for blocking oestradiol synthesis by 17-beta-hydroxysteroid dehydrogenase 1 (HSD1) in the latter part of the sulphatase pathway. Five analogues produced >= 62% HSD1 inhibition at 5 mu M and, furthermore, three of them produced >= 68% inhibition at 1 mu M. A docking-based structure-activity relationship analysis was done to determine the molecular basis of the inhibition and the cross-reactivity of the analogues was tested against oestrogen receptor, aromatase, cytochrome P450 1A2, and monoamine oxidases. Most of the analogues are only modestly active with 17-beta-hydroxysteroid dehydrogenase 2 - a requirement for lowering effective oestradiol levels in vivo. Moreover, the analysis led to the synthesis and discovery of 3-imidazolecoumarin as a potent aromatase inhibitor. In short, coumarin core can be tailored with specific ring and polar moiety substitutions to block either the sulphatase pathway or the aromatase pathway for treating breast cancer and endometriosis.
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