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Antitumor effects of dehydroxymethylepoxyquinomicin, a novel nuclear factor-kappaB inhibitor, in human liver cancer cells are mediated through a reactive oxygen species-dependent mechanism.
Mol Pharmacol. 2009 Aug; 76(2):290-300.MP

Abstract

Activation of the nuclear transcription factor-kappaB (NF-kappaB) has been implicated in liver tumorigenesis. We evaluated the effects of a novel NF-kappaB 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-kappaB 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 dose-dependent 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.

Authors+Show Affiliations

Institute of Biomedicine and Molecular Immunology Alberto Monroy, National Research Council, Palermo, Italy. lampiasi@ibim.cnr.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19461054

Citation

Lampiasi, Nadia, et al. "Antitumor Effects of Dehydroxymethylepoxyquinomicin, a Novel Nuclear factor-kappaB Inhibitor, in Human Liver Cancer Cells Are Mediated Through a Reactive Oxygen Species-dependent Mechanism." Molecular Pharmacology, vol. 76, no. 2, 2009, pp. 290-300.
Lampiasi N, Azzolina A, D'Alessandro N, et al. Antitumor effects of dehydroxymethylepoxyquinomicin, a novel nuclear factor-kappaB inhibitor, in human liver cancer cells are mediated through a reactive oxygen species-dependent mechanism. Mol Pharmacol. 2009;76(2):290-300.
Lampiasi, N., Azzolina, A., D'Alessandro, N., Umezawa, K., McCubrey, J. A., Montalto, G., & Cervello, M. (2009). Antitumor effects of dehydroxymethylepoxyquinomicin, a novel nuclear factor-kappaB inhibitor, in human liver cancer cells are mediated through a reactive oxygen species-dependent mechanism. Molecular Pharmacology, 76(2), 290-300. https://doi.org/10.1124/mol.109.055418
Lampiasi N, et al. Antitumor Effects of Dehydroxymethylepoxyquinomicin, a Novel Nuclear factor-kappaB Inhibitor, in Human Liver Cancer Cells Are Mediated Through a Reactive Oxygen Species-dependent Mechanism. Mol Pharmacol. 2009;76(2):290-300. PubMed PMID: 19461054.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Antitumor effects of dehydroxymethylepoxyquinomicin, a novel nuclear factor-kappaB inhibitor, in human liver cancer cells are mediated through a reactive oxygen species-dependent mechanism. AU - Lampiasi,Nadia, AU - Azzolina,Antonina, AU - D'Alessandro,Natale, AU - Umezawa,Kazuo, AU - McCubrey,James A, AU - Montalto,Giuseppe, AU - Cervello,Melchiorre, Y1 - 2009/05/20/ PY - 2009/5/23/entrez PY - 2009/5/23/pubmed PY - 2009/8/18/medline SP - 290 EP - 300 JF - Molecular pharmacology JO - Mol Pharmacol VL - 76 IS - 2 N2 - Activation of the nuclear transcription factor-kappaB (NF-kappaB) has been implicated in liver tumorigenesis. We evaluated the effects of a novel NF-kappaB 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-kappaB 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 dose-dependent 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. SN - 1521-0111 UR - https://www.unboundmedicine.com/medline/citation/19461054/Antitumor_effects_of_dehydroxymethylepoxyquinomicin_a_novel_nuclear_factor_kappaB_inhibitor_in_human_liver_cancer_cells_are_mediated_through_a_reactive_oxygen_species_dependent_mechanism_ L2 - http://molpharm.aspetjournals.org/cgi/pmidlookup?view=long&pmid=19461054 DB - PRIME DP - Unbound Medicine ER -