Anticancer activity of glaucarubinone analogues.
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A series of glaucarubinone analogues, obtained from natural sources as well as synthesized by us, were studied both in vitro and in vivo. The focus of the in vitro assessment was to define solid tumor-selective compounds by quantitating differential cytotoxic activity between murine and human solid tumor cells and either murine leukemia or normal cells. Subsequent in vivo studies were aimed at determining the therapeutic efficacy of these analogues against the murine models. Structure-activity analysis consequent to both the in vitro and in vivo studies demonstrated that few changes could be made in the parent glaucarubinone structure (outside of the C-15 position) without abrogating either cytotoxicity or potency. However, significant changes could be made at the C-15 position which modified, either enhanced or diminished, in vitro differential cytotoxicity, potency, human solid tumor selectively, and differential cytotoxicity to a MDR-expressing murine mammary tumor.