title: Adenoviral-mediated transfer of p53 gene enhances TRAIL-induced apoptosis in human hepatocellular carcinoma cells.
abstract: p53 is a tumor suppressor protein with numerous biological functions including transformation, regulation of cell growth, differentiation and apoptosis. The TNF-related apoptosis-inducing ligand (TRAIL) can induce apoptosis in various transformed cell lines. We investigated the effects of combining wild-type p53 gene transduction by adenoviral infection (Ad-p53) with addition of TRAIL on cell death, expression levels of TRAIL receptors (TRAIL-R1, TRAIL-R2), FLICE inhibitory protein (FLIP) and X-linked inhibitor of apoptosis protein (XIAP) on human hepatocellular carcinoma (HCC) cell lines. HCC cell death was increased by combination of Ad-p53 infection and addition of TRAIL compared to either alone. Western blotting demonstrated decreased TRAIL-R1 and TRAIL-R2 levels after infection with Ad-p53. FLIP levels decreased in Huh7 cells and Hep3B cells, and XIAP levels decreased in all three HCC cell lines after infection with Ad-p53. Thus, death of HCC cells due to combined p53 gene transduction and exogenous TRAIL may be due to down regulation of FLIP or XIAP.
authors.affiliation: First Department of Internal Medicine, Mie University School of Medicine, Tsu, Mie 514-8507, Japan.
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Inoue
authors.forename: Katsuya
authors.initials: K
authors.lastname: Shiraki
authors.forename: Kazumoto
authors.initials: K
authors.lastname: Murata
authors.forename: Kazushi
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Kawakita
authors.forename: Yumi
authors.initials: Y
authors.lastname: Yamaguchi
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Saitou
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Enokimura
authors.forename: Norihiko
authors.initials: N
authors.lastname: Yamamoto
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yamanaka
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakano
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D017209:Apoptosis; D051017:Apoptosis Regulatory Proteins; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; D006528:Carcinoma, Hepatocellular / Q000235:genetics / Q000473:pathology* / Q000628:therapy; D016923:Cell Death; D002461:Cell Line, Transformed; D045744:Cell Line, Tumor; D004396:Coloring Agents / Q000494:pharmacology; D015536:Down-Regulation; D016158:Genes, p53; D015316:Genetic Therapy / Q000379:methods; D006801:Humans; D015151:Immunoblotting; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism; D008113:Liver Neoplasms / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism; D053221:TNF-Related Apoptosis-Inducing Ligand; D013778:Tetrazolium Salts / Q000494:pharmacology; D013844:Thiazoles / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D015854:Up-Regulation; D051636:X-Linked Inhibitor of Apoptosis Protein
chemical_list: D051017:Apoptosis Regulatory Proteins; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; C506386:CFLAR protein, human; D004396:Coloring Agents; D047908:Intracellular Signaling Peptides and Proteins; D008562:Membrane Glycoproteins; D011506:Proteins; D053221:TNF-Related Apoptosis-Inducing Ligand; C505653:TNFSF10 protein, human; D013778:Tetrazolium Salts; D013844:Thiazoles; D014409:Tumor Necrosis Factor-alpha; D016159:Tumor Suppressor Protein p53; D051636:X-Linked Inhibitor of Apoptosis Protein; C496866:XIAP protein, human; C022616:thiazolyl blue