Soluble factors in tolerance and contact sensitivity to DNFB in mice. VIII. Regulation of T suppressor cell function by autoreactive T helper cells.
When cultured with DNP-labeled I-A+ cells, Lyt 2+ T suppressor cells (Ts) from 2,4,-dinitrobenzene sulfonate (DNBS)-tolerized mice are activated to synthesize and release a suppressor factor (SSF) which suppresses the transfer of contact sensitivity to DNFB. The signals required to activate the DNBS-primed Ts to produce SSF were studied in greater detail. As previously observed with fixed DNP-labeled spleen cell stimulators, the supernatants from cultures of DNBS-primed spleen cells and glutaraldehyde-fixed DNP-labeled P388D1 cell monolayers did not contain SSF. When the tolerant cells were harvested from these monolayers and were treated with IL-1, the Ts released the synthesized SSF. Synthesis and release of SSF required Ts recognition of DNP/class I MHC on the hapten-presenting cells followed by interaction with the costimulator IL-1. When the tolerant cells were cultured with fixed DNP-labeled I-A+ or I-A- stimulators to induce SSF synthesis, release was induced by adding either unlabeled or TNP-labeled unprimed spleen cells to the cultures. The release of SSF was blocked when the second stimulators were pretreated with anti-I-A antibody but not with anti-DNP or anti-class I MHC antibodies. These results indicate that the release of SSF by DNBS-primed Lyt 2+ Ts is regulated by the activity of a self-I-A-reactive (i.e., autoreactive) T cell in the tolerant spleen cell population.
Fairchild
R L
RL
Department of Microbiology/Immunology, University of Colorado School of Medicine, Denver 80262.
Moorhead
J W
JW
D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D001557:Benzenesulfonates / Q000276:immunology*; D003877:Dermatitis, Contact / Q000276:immunology*; D004136:Dinitrobenzenes / Q000276:immunology; D015395:Histocompatibility Antigens Class I / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007108:Immune Tolerance; D051379:Mice; D008807:Mice, Inbred BALB C; D013491:Suppressor Factors, Immunologic / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
D000945:Antigens, Differentiation, T-Lymphocyte; D001557:Benzenesulfonates; D004136:Dinitrobenzenes; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D013491:Suppressor Factors, Immunologic; C001073:2,4-dinitrobenzenesulfonic acid