title: Alpha-tocopheryl succinate induces DR4 and DR5 expression by a p53-dependent route: implication for sensitisation of resistant cancer cells to TRAIL apoptosis.
abstract: We evaluated the ability of alpha-tocopheryl succinate (alpha-TOS) to sensitise TRAIL-resistant malignant mesothelioma (MM) cells to TRAIL-induced apoptosis. We show that alpha-TOS activates expression of DR4/DR5 in a p53-dependent manner and re-establishes sensitivity of resistant MM cells to TRAIL-mediated apoptosis, as documented in p53wt MM cells but not in their p53null counterparts. MM cells selected for TRAIL resistance expressed low cell surface levels of DR4 and DR5. Treatment with sub-lethal doses of alpha-TOS restored expression of DR4 and DR5. The ability of alpha-TOS to modulate expression of pro-apoptotic genes may play a role in sensitisation of tumour cells to immunological stimuli.
authors.affiliation: Department of Molecular Pathology and Innovative Therapies, Polytechnic University of Marche, via Ranieri 1, Ancona, Italy. mtomasetti@virgilio.it
authors.forename: Marco
authors.initials: M
authors.lastname: Tomasetti
authors.forename: Ladislav
authors.initials: L
authors.lastname: Andera
authors.forename: Renata
authors.initials: R
authors.lastname: Alleva
authors.forename: Battista
authors.initials: B
authors.lastname: Borghi
authors.forename: Jiri
authors.initials: J
authors.lastname: Neuzil
authors.forename: Antonio
authors.initials: A
authors.lastname: Procopio
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D051017:Apoptosis Regulatory Proteins / Q000494:pharmacology*; D003593:Cytoplasm / Q000378:metabolism; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D006801:Humans; D008562:Membrane Glycoproteins / Q000494:pharmacology*; D009369:Neoplasms / Q000378:metabolism / Q000473:pathology; D011956:Receptors, Cell Surface / Q000378:metabolism; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D053221:TNF-Related Apoptosis-Inducing Ligand; D024505:Tocopherols; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*; D014810:Vitamin E / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D051017:Apoptosis Regulatory Proteins; D008562:Membrane Glycoproteins; D011956:Receptors, Cell Surface; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; D011994:Recombinant Proteins; D053221:TNF-Related Apoptosis-Inducing Ligand; C105190:TNFRSF10A protein, human; C505639:TNFRSF10B protein, human; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha; D016159:Tumor Suppressor Protein p53; D014810:Vitamin E; D024505:Tocopherols