title: The fine specificity of immune suppression to individual nucleosides.
abstract: The fine specificity of immune suppression was further studied in a murine experimental model in which the induction and expression of suppression by individual nucleoside-bound spleen cells were examined. The experiments were undertaken: a) to determine whether all 4 nucleosides have the ability to elicit suppressor T cells; b) to examine the specificity of cross-suppression induced by individual nucleosides; and c) to establish that nucleoside-specific suppression is mediated by T cells bearing nucleoside-specific receptors. The results show that, of the 4 nucleosides studied, only guanosine and thymine riboside were capable of eliciting immune suppression. Thymine riboside-coupled spleen cells induced cross-suppression to all 4 nucleosides. Furthermore, the nonresponsive state generated by guanosine-spleen cells was found to be transferable and mediated by nucleoside-binding T cells. The ability of only select nucleosides to elicit immune suppression is discussed in the context of recent evidence demonstrating the selective activation of T cell subsets by intramolecular antigenic determinants.
mesh_terms: D000818:Animals; D000918:Antibody Specificity; D000921:Antibody-Producing Cells / Q000276:immunology; D002469:Cell Separation; D006151:Guanosine / Q000276:immunology; D006462:Hemolytic Plaque Technique; D007108:Immune Tolerance; D007116:Immunization, Passive; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009705:Nucleosides / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D013936:Thymidine / Q000494:pharmacology
chemical_list: D009705:Nucleosides; D006151:Guanosine; D013936:Thymidine