title: Apoptosis by a cytosolic extract from Fas-activated cells.
abstract: Fas is a type I membrane protein and its activation by binding of the Fas ligand or an agonistic anti-Fas antibody induces apoptosis in Fas-bearing cells. In this report we prepared lysates from cells treated with anti-Fas antibody. The lysates induced apoptotic morphological changes in nuclei from normal mouse liver, accompanied by DNA degradation. The apoptosis-inducing activity was quickly generated in cells by anti-Fas antibody and was found in the soluble cytosolic fraction. Induction of the activity in cells was inhibited by a tetrapeptide, acetyl-Tyr-Val-Ala-Asp-chloromethylketone, a specific inhibitor of interleukin-1 beta converting enzyme. Addition of COS cell lysates containing Bcl-2 to the assay significantly inhibited the apoptotic process, indicating that the in vitro process reflected apoptosis that occurs in intact cells.
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D020170:Caspase 1; D002457:Cell Extracts; D002460:Cell Line; D002467:Cell Nucleus / Q000502:physiology; D003546:Cysteine Endopeptidases / Q000378:metabolism; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D003600:Cytosol / Q000502:physiology; D004249:DNA Damage / Q000187:drug effects; D008099:Liver / Q000473:pathology; D051379:Mice; D011518:Proto-Oncogene Proteins / Q000502:physiology; D019253:Proto-Oncogene Proteins c-bcl-2; D019014:fas Receptor / Q000276:immunology / Q000502:physiology*
chemical_list: D002457:Cell Extracts; D015853:Cysteine Proteinase Inhibitors; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D019014:fas Receptor; D003546:Cysteine Endopeptidases; D020170:Caspase 1