title: In vitro thymocyte maturation is associated with reduced cellular susceptibility to Fas-mediated apoptosis.
abstract: We have developed a novel system in which the susceptibility of murine thymocytes to Fas-mediated apoptosis can be modulated. Thymocyte susceptibility to Fas decreases under in vitro culture conditions that promote aspects of thymocyte maturation. The hyporesponsive state is specific for the Fas pathway, since cellular susceptibility to other apoptotic stimuli is not reduced. Hyporesponsiveness is not associated with alterations in the thymocyte subset distribution, decreased expression of full-length Fas protein, or alterations in FADD, Bcl-2, or Bcl-XL expression. Hyporesponsiveness is overcome by increasing the strength of the Fas cross-linking stimulus, leading us to propose that reduced thymocyte susceptibility to apoptosis results from altered Fas signaling. The block in Fas signaling resides proximal to ceramide generation, since Fas-hyporesponsive thymocytes are susceptible to ceramide-induced apoptosis. Further characterization of Fas signaling in these in vitro cultured thymocytes may facilitate the identification of factors regulating the susceptibility of wild-type lymphocytes to Fas.
authors.affiliation: Department of Surgery, University of Pittsburgh, Pennsylvania 15213, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Hershberger
authors.forename: H
authors.initials: H
authors.lastname: He
authors.forename: S A
authors.initials: SA
authors.lastname: McCarthy
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000276:immunology*; D002352:Carrier Proteins / Q000096:biosynthesis; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology; D002469:Cell Separation; D002478:Cells, Cultured; D003080:Cold Temperature; D053200:Fas-Associated Death Domain Protein; D005260:Female; D006358:Hot Temperature; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis; D015398:Signal Transduction / Q000276:immunology; D013110:Sphingosine / Q000031:analogs & derivatives / Q000494:pharmacology; D013601:T-Lymphocytes / Q000166:cytology* / Q000187:drug effects / Q000276:immunology*; D013950:Thymus Gland / Q000166:cytology* / Q000187:drug effects / Q000276:immunology*; D051020:bcl-X Protein; D019014:fas Receptor / Q000096:biosynthesis / Q000737:chemistry / Q000502:physiology*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C494812:Bcl2l1 protein, mouse; D002352:Carrier Proteins; C505534:Fadd protein, mouse; D053200:Fas-Associated Death Domain Protein; C064769:N-acetylsphingosine; D019253:Proto-Oncogene Proteins c-bcl-2; D051020:bcl-X Protein; D019014:fas Receptor; D013110:Sphingosine