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• W1997103666 abstract "The organic extract of a marine sponge, Petrosia alfiani, selectively inhibited iron chelator-induced hypoxia-inducible factor-1 (HIF-1) activation in a human breast tumor T47D cell-based reporter assay. Bioassay-guided fractionation yielded seven xestoquinones (1–7) including three new compounds: 14-hydroxymethylxestoquinone (1), 15-hydroxymethylxestoquinone (2), and 14,15-dihydroxestoquinone (3). Compounds 1–7 were evaluated for their effects on HIF-1 signaling, mitochondrial respiration, and tumor cell proliferation/viability. The known metabolites adociaquinones A (5) and B (6), which possess a 3,4-dihydro-2H-1,4-thiazine-1,1-dioxide moiety, potently and selectively inhibited iron chelator-induced HIF-1 activation in T47D cells, each with an IC50 value of 0.2 μM. Mechanistic studies revealed that adociaquinones promote oxygen consumption without affecting mitochondrial membrane potential. Compound 1 both enhances respiration and decreases mitochondrial membrane potential, suggesting that it acts as a protonophore that uncouples mitochondrial respiration." @default.
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• W1997103666 date "2012-08-31" @default.
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• W1997103666 title "Structures and Mechanisms of Antitumor Agents: Xestoquinones Uncouple Cellular Respiration and Disrupt HIF Signaling in Human Breast Tumor Cells" @default.
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• W1997103666 doi "https://doi.org/10.1021/np3002892" @default.
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