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• W1997754024 abstract "Hypoxia-inducible factor-1 (HIF-1) is a transcription factor that promotes tumor cell adaptation and survival under hypoxic conditions. HIF-1 is currently recognized as an important molecular target for anticancer drug discovery. A T47D breast tumor cell-based reporter assay was used to evaluate the NCI Open Repository of marine invertebrates and algae lipid extracts for HIF-1 inhibitory activity. Bioassay-guided fractionation and isolation of an active extract from Axinella sp. yielded seven new sodwanone triterpenoids [3-epi-sodwanone K (1), 3-epi-sodwanone K 3-acetate (2), 10,11-dihydrosodwanone B (4), sodwanones T-W (3, 7, 8, 9)], the new yardenone triterpene 12R-hydroxyyardenone (10), and the previously reported compounds sodwanone A (5), sodwanone B (6), and yardenone (11). The structures and relative configurations of these Axinella metabolites were determined spectroscopically. The absolute configuration of 1 was determined by the modified Mosher ester procedure. Sodwanone V (8) inhibited both hypoxia-induced and iron chelator (1,10-phenanthroline)-induced HIF-1 activation in T47D breast tumor cells (IC50 15 microM), and 8 was the only sodwanone that inhibited HIF-1 activation in PC-3 prostate tumor cells (IC50 15 microM). Compounds 1, 3, 4, and 5 inhibited hypoxia-induced HIF-1 activation in T47D cells (IC50 values 20-25 microM). Compound 2 was cytotoxic to T47D cells (IC50 22 microM), and 8 showed cytotoxicity to MDA-MB-231 breast tumor cells (IC50 23 microM)." @default.
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• W1997754024 date "2006-11-17" @default.
• W1997754024 modified "2023-10-14" @default.
• W1997754024 title "Sodwanone and Yardenone Triterpenes from a South African Species of the Marine Sponge <i>Axinella</i> Inhibit Hypoxia-Inducible Factor-1 (HIF-1) Activation in Both Breast and Prostate Tumor Cells" @default.
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• W1997754024 doi "https://doi.org/10.1021/np060278q" @default.
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