4’,6-Dihydroxy-4-methoxyisoaurone Inhibits the HIF-1α Pathway Through Inhibition of Akt/mTOR/p70S6K/4E-BP1 Phosphorylation

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  • Mi Chunliu
    Molecular Cancer Research Center, Yanbian University, China Chemical Biology Research Center, Department of Chemistry, Yanbian University, China
  • Ma Juan
    Molecular Cancer Research Center, Yanbian University, China Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, China
  • Shi Hui
    Molecular Cancer Research Center, Yanbian University, China Chemical Biology Research Center, Department of Chemistry, Yanbian University, China
  • Li Jing
    Molecular Cancer Research Center, Yanbian University, China Chemical Biology Research Center, Department of Chemistry, Yanbian University, China
  • Wang Fei
    Molecular Cancer Research Center, Yanbian University, China Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, China
  • Lee Jung Joon
    Molecular Cancer Research Center, Yanbian University, China
  • Jin Xuejun
    Molecular Cancer Research Center, Yanbian University, China Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, China

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タイトル別名
  • 4′,6-Dihydroxy-4-methoxyisoaurone Inhibits the HIF-1<i>α</i> Pathway Through Inhibition of Akt/mTOR/p70S6K/4E-BP1 Phosphorylation
  • 4′,6-Dihydroxy-4-methoxyisoaurone Inhibits the HIF-1α Pathway Through Inhibition of Akt/mTOR/p70S6K/4E-BP1 Phosphorylation

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抄録

4′,6-Dihydroxy-4-methoxyisoaurone (ISOA) is an isoaurone compound isolated from Trichosanthes kirilowii seeds, which was identified as an inhibitor of tumor growth. However, the mechanism by which ISOA inhibits hypoxia-inducible factor-1 (HIF-1)-mediated tumor growth is not fully understood. We here demonstrated the effect of ISOA on HIF-1 activation. ISOA showed a potent inhibitory activity against HIF-1 activation induced by hypoxia in various human cancer cell lines. This compound markedly decreased the hypoxia-induced accumulation of HIF-1α protein dose-dependently, whereas it did not affect the expressions of HIF-1β and topoisomerase-I (Topo-I). Further analysis revealed that the suppression of HIF-1α accumulation by ISOA was closely correlated with strong dephosphorylation of Akt, mammalian target of rapamycin (mTOR), and its effectors ribosomal protein S6 kinase (p70S6K) and eukaryotic initiation factor 4E-binding protein-1 (4E-BP1), a pathway known to regulate HIF-1α expression at the translational level. Furthermore, ISOA prevented hypoxia-induced expression of HIF-1 target genes and suppresses the invasiveness of tumor cells. Taken together, our results suggested that ISOA is an effective inhibitor of HIF-1 through targeting Akt/mTOR/p70S6K/4E-BP1 pathway, thereby, providing new perspectives into the mechanism of its anticancer activity.

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