title: Differential activity of bcl-2 and ICE enzyme family protease inhibitors on Fas and puromycin-induced apoptosis of glioma cells.
abstract: Fas ligand is a potent inducer of apoptosis in human glioma cells by the Fas/Fas ligand pathway. With comparable efficiency, metalloprotease inhibitors including puromycin and bestatin induce apoptosis in glioma cells. To evaluate the involvement of potential components involved in Fas ligand- and metalloprotease inhibitor-induced apoptosis, we investigated the effect of anti human Fas antibody, soluble Fas ligand and puromycin on cultures of human malignant glioma cell lines (LN-18, LN-229, T98G). Stimulation with Fas ligand lead to apoptotic cell death within 16 h. Costimulation with the translational inhibitor cycloheximide and the transcription blocker actinomycin D did not reduce Fas ligand toxicity. In contrast, apoptosis induced by puromycin was blocked by cycloheximide and decreased by subtoxic doses of actinomycin D in all three gliomas. Whereas inhibition of caspase activity with the general inhibitor zVAD-fmk resulted in a complete block of Fas ligand-induced cell death, puromycin-mediated apoptosis was found to be unaffected by zVAD-fmk as well as by more specific inhibitors for caspase-1 (Interleukin-1 beta converting enzyme) and caspase-3 (CPP32/Yama). Other prominent components involved in many apoptotic pathways as bcl-2 and reactive oxygen intermediates were also examined. Bcl-2 which protects glioma cells from Fas ligand-induced cell death, was shown to have only a small protective effect on puromycin-induced apoptosis. The tested radical scavengers did not reduce Fas- or puromycin-mediated killing of human glioma cells.
authors.affiliation: University Hospital Zurich, Section of Clinical Immunology, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Schlapbach
authors.forename: A
authors.initials: A
authors.lastname: Fontana
mesh_terms: D000590:Amino Acid Chloromethyl Ketones / Q000494:pharmacology; D000911:Antibodies, Monoclonal / Q000276:immunology; D017209:Apoptosis / Q000187:drug effects*; D020170:Caspase 1; D002470:Cell Survival / Q000187:drug effects; D003513:Cycloheximide / Q000494:pharmacology; D003546:Cysteine Endopeptidases / Q000378:metabolism*; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology*; D003609:Dactinomycin / Q000494:pharmacology; D053222:Fas Ligand Protein; D016166:Free Radical Scavengers / Q000494:pharmacology; D005910:Glioma / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007930:Leucine / Q000031:analogs & derivatives / Q000494:pharmacology; D008562:Membrane Glycoproteins / Q000378:metabolism; D009842:Oligopeptides / Q000494:pharmacology; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics / Q000378:metabolism*; D011691:Puromycin / Q000494:pharmacology; D014162:Transfection / Q000235:genetics; D014407:Tumor Cells, Cultured; D019014:fas Receptor / Q000276:immunology / Q000378:metabolism
chemical_list: D000590:Amino Acid Chloromethyl Ketones; D000911:Antibodies, Monoclonal; D015853:Cysteine Proteinase Inhibitors; C505661:FASLG protein, human; D053222:Fas Ligand Protein; D016166:Free Radical Scavengers; D008562:Membrane Glycoproteins; C098738:N-acetyl-tyrosyl-valyl-alanyl-aspartyl chloromethyl ketone; D009842:Oligopeptides; D019253:Proto-Oncogene Proteins c-bcl-2; C099158:acetyl-aspartyl-glutamyl-valyl-aspartal; D019014:fas Receptor; C096429:L 709049; D003609:Dactinomycin; D011691:Puromycin; D003513:Cycloheximide; D003546:Cysteine Endopeptidases; D020170:Caspase 1; D007930:Leucine; C012211:ubenimex