title: P38MAPK regulates caspase-3 by binding to caspase-3 in nucleus of human hepatoma Bel-7402 cells during anti-Fas antibody- and actinomycin D-induced apoptosis.
abstract: Anti-Fas antibody- and actinomycin D (FA/AD) has been shown to have anti-tumor activity in some tumor cells. However, many of the molecular mechanism of FA/AD-induced apoptosis of human hepatoma Bel-7402 cells have not been fully clarified. In the present study, therefore, the effect of FA/AD in presence or absence of p38MAPK inhibitor SB203580 on the proliferation, apoptosis, p38MAPK, caspase-3, location of p38MAPK and caspase-3, and interaction between p38MAPK and caspase-3 in Bel-7402 cell was investigated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT), annexin V-FITC/propidium iodide (PI) double staining, electron microscopy, immunoblot, immunofluorescence and immunoprecipitation/immunoblot assay, respectively. We found that FA/AD significantly resulted in the inhibition of proliferation, induction of apoptosis, activation and up-regulation of p38MAPK, activation and up-regulation of caspase-3, translocation of p38MAPK and caspase-3 from cytosol to nucleus, and formation of p38MAPK/caspase-3 complex in Bel-7402 cells. In contrast, SB203580, a p38MAPK-specific inhibitor, apparently blocked induction of apoptosis, activation and up-regulation of p38MAPK, activation and up-regulation of caspase-3, and translocation of p38MAPK and caspase-3 from cytosol to nucleus in FA/AD-treated Bel-7402 cells. Taken together, we conclude that p38MAPK regulates caspase-3 by binding to caspase-3 in nucleus of Bel-7402 cells during FA/AD-induced apoptosis.
authors.affiliation: Department of Biochemistry and Molecular Biology, China Medical University, Shenyang 110001, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Liguang
authors.initials: L
authors.lastname: Sun
authors.forename: Chunhui
authors.initials: C
authors.lastname: Xia
authors.forename: Liping
authors.initials: L
authors.lastname: Ye
authors.forename: Biao
authors.initials: B
authors.lastname: Wang
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000494:pharmacology*; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D053148:Caspase 3 / Q000378:metabolism*; D045744:Cell Line, Tumor; D002467:Cell Nucleus / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D003609:Dactinomycin / Q000494:pharmacology*; D005434:Flow Cytometry; D006801:Humans; D047468:Immunoprecipitation; D046529:Microscopy, Electron, Transmission; D011485:Protein Binding; D019014:fas Receptor / Q000037:antagonists & inhibitors* / Q000276:immunology; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism / Q000502:physiology*
chemical_list: D000903:Antibiotics, Antineoplastic; D000911:Antibodies, Monoclonal; D019014:fas Receptor; D003609:Dactinomycin; D048051:p38 Mitogen-Activated Protein Kinases; D053148:Caspase 3