Structures and mechanisms of antitumor agents: xestoquinones uncouple cellular respiration and disrupt HIF signaling in human breast tumor cells.
Structures and mechanisms of antitumor agents: xestoquinones uncouple cellular respiration and disrupt HIF signaling in human breast tumor cells.
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DOI:
10.1021/np3002892
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发表时间:
2012-09-28
影响因子:
5.1
通讯作者:
Nagle DG
中科院分区:
文献类型:
--
作者:
Du L;Mahdi F;Datta S;Jekabsons MB;Zhou YD;Nagle DG
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), that 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.
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