Synthesis, structure-activity relationship and in vitro pharmacodynamics of A-ring modified caged xanthones in a preclinical model of inflammatory breast cancer
作者:Oraphin Chantarasriwong、Andrew T. Milcarek、Theodore Habarth Morales、Aspen L. Settle、Celso O. Rezende、Bashayer D. Althufairi、Maria A. Theodoraki、Mary L. Alpaugh、Emmanuel A. Theodorakis
DOI:10.1016/j.ejmech.2019.02.047
日期:2019.4
Inflammatory breast cancer (IBC) is a highly metastatic, lethal form of breast cancer that lacks targeted therapeutic strategies. Inspired by the promising cytotoxicity of gambogic acid and related caged xanthones in spheroids(MARY-X), an in vitro preclinical IBC model, we constructed a library of synthetic analogs and performed structure-activity relationship studies. The studies revealed that functionalizing the A-ring of the caged xanthone framework can significantly affect potency. Specifically, introduction of hydroxyl or fluorine groups at discrete positions of the A-ring leads to enhanced cytotoxicity at sub-micromolar concentrations. These compounds induce complete dissolution of spheroids(MARY-X) with subsequent apoptosis of both the peripherally- and centrally-located cells, proliferative and quiescent-prone (e.g. hypoxic), respectively. These results highlight the structural flexibility and pharmacological potential of the caged xanthone motif for the design of IBC-targeting therapeutics. (C) 2019 Elsevier Masson SAS. All rights reserved.