title: ICAM-1 is required for T cell proliferation but not for anergy or apoptosis induced by Staphylococcus aureus enterotoxin B in vivo.
abstract: The response of T lymphocytes to superantigens requires expression of the appropriate TCR V beta gene products as well as the establishment of cellular interactions mediated by adhesion molecules. To study the role of intercellular adhesion molecule (ICAM)-1 in the response in vivo to superantigens, we have analyzed the effects induced by the bacterial superantigen Staphylococcus aureus enterotoxin B (SEB) in mice which have been made genetically deficient in ICAM-1. SEB treatment of wild-type mice causes proliferation, deletion and anergy of the SEB-reactive V beta 8+ T cell population. Here we show that cellular interactions mediated by ICAM-1 are not essential for the induction of anergy or for the deletion of CD4+ V beta 8+ or CD8+ V beta 8+ T cells, but are required for the proliferation of these peripheral T lymphocytes. This is the first demonstration in vivo that the absence of the co-stimulatory signals provided by the interaction of ICAM-1 with its specific ligands impairs the proliferation of SEB-reactive T cells. Interestingly, our study showed that SEB-induced proliferation of CD8+ V beta 8+ T cells from lymph nodes (not from spleen) is independent of the interactions mediated by ICAM-1.
authors.affiliation: Center for Blood Research, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Gonzalo
authors.forename: C
authors.initials: C
authors.lastname: Martinez
authors.forename: T A
authors.initials: TA
authors.lastname: Springer
authors.forename: J C
authors.initials: JC
authors.lastname: Gutierrez-Ramos
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology*; D017209:Apoptosis / Q000502:physiology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002455:Cell Division / Q000502:physiology; D002478:Cells, Cultured; D017635:Clonal Anergy / Q000502:physiology*; D004768:Enterotoxins / Q000276:immunology*; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics / Q000502:physiology*; D008198:Lymph Nodes / Q000166:cytology; D008213:Lymphocyte Activation / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D009928:Organ Specificity; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics; D013047:Specific Pathogen-Free Organisms; D013154:Spleen / Q000166:cytology; D013211:Staphylococcus aureus / Q000276:immunology; D018089:Superantigens / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D004768:Enterotoxins; D016693:Receptors, Antigen, T-Cell, alpha-beta; D018089:Superantigens; D018799:Intercellular Adhesion Molecule-1; C031818:enterotoxin B, staphylococcal