title: Actin cytoskeleton is required for early apoptosis signaling induced by anti-Fas antibody but not Fas ligand in murine B lymphoma A20 cells.
abstract: Murine B lymphoma A20 cells are highly sensitive to Fas-mediated death signals induced by anti-Fas antibody Jo2 or cross-linked Fas ligand (FasL). We have found that the microfilament poison cytochalasin D blocks Fas-mediated apoptosis induced by Jo2 but not FasL in A20 cells. The induction of Fas-mediated apoptosis by Jo2 was antagonized by anti-Fcgamma RII/RIII receptor (FcgammaR) antibody, and defective in FcgammaR-negative A20 cells. Since the induction of Jo2-mediated apoptosis in FcgammaR-negative A20 cells was reversed by the addition of wild type A20 cells or the cross-linking agent protein A, Fas-expressing bystander A20 cells seem to be killed by other A20 cells that capture and cross-link monomeric Jo2 via FcgammaR. Although cytochalasin D affected FcgammaR-mediated cross-linking of Jo2 molecules, the drug markedly inhibited the intracellular signaling pathway induced by Jo2. The blockade of Jo2-induced apoptosis by cytochalasin D occurred upstream of caspase-8 activation. Thus, these observations suggest that actin cytoskeleton is required for early apoptosis signaling induced by Jo2, but not physiological FasL.
authors.affiliation: Department of Bioengineering, Research Center for Experimental Biology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan.
authors.forename: Masashige
authors.initials: M
authors.lastname: Bando
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Miyake
authors.forename: Masashi
authors.initials: M
authors.lastname: Shiina
authors.forename: Masaaki
authors.initials: M
authors.lastname: Wachi
authors.forename: Kazuo
authors.initials: K
authors.lastname: Nagai
authors.forename: Takao
authors.initials: T
authors.lastname: Kataoka
mesh_terms: D000199:Actins / Q000737:chemistry* / Q000502:physiology*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000378:metabolism*; D058846:Antibodies, Monoclonal, Murine-Derived; D017209:Apoptosis; D015153:Blotting, Western; D053148:Caspase 3; D053181:Caspase 8; D053453:Caspase 9; D020169:Caspases / Q000096:biosynthesis; D002462:Cell Membrane / Q000378:metabolism; D002469:Cell Separation; D002470:Cell Survival; D002478:Cells, Cultured; D002850:Chromatography, Gel; D003432:Cross-Linking Reagents / Q000494:pharmacology; D015638:Cytochalasin D / Q000494:pharmacology; D003599:Cytoskeleton / Q000378:metabolism / Q000502:physiology*; D053938:DNA Fragmentation; D004305:Dose-Response Relationship, Drug; D053222:Fas Ligand Protein; D005434:Flow Cytometry; D006801:Humans; D008562:Membrane Glycoproteins / Q000378:metabolism*; D051379:Mice; D008954:Models, Biological; D011485:Protein Binding; D011994:Recombinant Proteins / Q000378:metabolism; D013997:Time Factors; D014407:Tumor Cells, Cultured
chemical_list: D000199:Actins; D000911:Antibodies, Monoclonal; D058846:Antibodies, Monoclonal, Murine-Derived; D003432:Cross-Linking Reagents; C505661:FASLG protein, human; D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D008562:Membrane Glycoproteins; D011994:Recombinant Proteins; C411023:anti-Fas monoclonal antibody; D015638:Cytochalasin D; C505407:CASP3 protein, human; C505530:CASP8 protein, human; C506433:CASP9 protein, human; C505409:Casp3 protein, mouse; C505526:Casp8 protein, mouse; C506434:Casp9 protein, mouse; D053148:Caspase 3; D053181:Caspase 8; D053453:Caspase 9; D020169:Caspases