Antitumor effects of DHMEQ, a novel NF-kB inhibitor, in human liver cancer cells is mediated through a reactive oxygen species-dependent mechanism. (Articolo in rivista)

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  • Antitumor effects of DHMEQ, a novel NF-kB inhibitor, in human liver cancer cells is mediated through a reactive oxygen species-dependent mechanism. (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Lampiasi N, Azzolina A, D'Alessandro N, Umezawa K, McCubrey JA, Montalto G, Cervello M. (2009)
    Antitumor effects of DHMEQ, a novel NF-kB inhibitor, in human liver cancer cells is mediated through a reactive oxygen species-dependent mechanism.
    in Molecular pharmacology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Lampiasi N, Azzolina A, D'Alessandro N, Umezawa K, McCubrey JA, Montalto G, Cervello M. (literal)
Pagina inizio
  • 290 (literal)
Pagina fine
  • 300 (literal)
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  • 76 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • 76(2) IN PRESS. (literal)
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  • 10 (literal)
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  • 2 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • Lampiasi Nadia, Azzolina Antonina, Melchiorre Cerevllo IBIM CNR Montalto Giuseppe Dipartimento Clininica Medica e Patologie Emergenti Università di palermo D'Alessandro natale Dipartimento di Scienze Farmacologiche Università di palermo (literal)
Titolo
  • Antitumor effects of DHMEQ, a novel NF-kB inhibitor, in human liver cancer cells is mediated through a reactive oxygen species-dependent mechanism. (literal)
Abstract
  • Activation of the nuclear transcription factor-kB (NF-kB) has been implicated in liver tumorigenesis. We evaluated the effects of a novel NF-kB inhibitor, dehydroxymethylepoxyquinomicin (DHMEQ), in two human liver cancer cell lines HA22T/VGH and HuH-6. DHMEQ treatment dose dependently decreased the DNA-binding capacity of the NF-?B p65 subunit, inhibited cell growth and proliferation, and increased apoptosis as shown by caspase activation, release of cytochrome c, poly(ADP-ribose) polymerase cleavage, and down-regulation of survivin. DHMEQ also induced a dose-dependent activation of mitogen-activated protein kinase kinase/extracellular signal-regulated kinase signaling, and inhibition of this pathway significantly reduced cell growth. It is noteworthy that we observed that DHMEQ stimulated reactive oxygen species (ROS) production in a dosedependent manner and that pretreatment of the cells with the antioxidant N-acetyl-L-cysteine (NAC) significantly reduced DHMEQ-induced ROS generation. Accordingly, NAC completely reversed the DHMEQ-induced growth inhibition, caspase activation, and cell death. DHMEQ-treated cells exhibited DNA damage, as evaluated by accumulation in nuclear foci of phospho-H2AX, which was completely reversed by NAC. Moreover, DHMEQ induced the expression of genes involved in the endoplasmic reticulum stress response (GRP78,CHOP, TRB3) and promoted the splicing of XBP1 mRNA in a dose-dependent fashion in both cell lines, which was reversed in the presence of NAC. Knockdown of TRB3 mRNA expression by small interference RNA significantly decreased DHMEQ- induced cell growth inhibition. These data suggest that DHMEQ antitumor effects are primarily mediated through ROS generation. Thereby, considering that cancer cells are under increased ER stress and oxidative stress conditions, DHMEQ may greatly improve various anticancer strategies. (literal)
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