Abstract
The antigen binding capacity and function of T cells which adhere to the lectin Vicia villosa (VV) or to streptococcal antigen (SA) have been studied. VV-adherent T8+ cells (T8+ VV+) bind 125I-SA whereas VV non-adherent T8+ cells (T8+ VV-) bind little SA. Similarly, SA-adherent T8+ cells (T8+ SA+) bind 125I-SA specifically, whereas SA-non-adherent T8+ cells (T8+ SA-) show little binding of 125I-SA. The SA binding T8+ VV+ or T8+ SA+ cells can present the antigen to T4+ helper cells which generate helper factors and these enhance anti-DNP-antibodies, when incubated with mouse spleen cells and DNP-SA. Parallel reconstitution studies with either T8+ VV- or T8+ SA- cells have revealed that both subpopulations of cells can suppress T4+ helper cell activity. Further reconstitution experiments between the T8+ VV+ (or T8+ SA+) antigen presenting cells and T8+ VV- (or T8+ SA-) suppressor cells suggest that the former can also prevent the latter cells from inhibiting T4 helper cells, so as to function as contrasuppressor cells. Cross-over, reconstitution studies between the VV and SA separated cells have confirmed that the T8+ VV+ and T8+ SA+ cells have similar functions, in SA binding, presenting and contrasuppressor activities. The dose-response curve of binding 125I-SA to T8+ cells is dependent on the HLA-DR type of cells and the binding of 125I-tetanus toxoid was similar to that of 125I-SA. Whereas DRw6- T cells bind predominantly 1,000 ng SA or tetanus toxoid, DRw6+ T cells bind 1 ng and to a lesser extent 1,000 ng of either antigen. HLA-DRw6+ subjects can be considered as high responders for their T cells bind optimally at low concentrations of antigens which induce helper and contrasuppressor functions. In contrast, HLA-DRw6-subjects can be considered as low responders, as their T cells bind optimally at high concentrations of antigens and only the latter induce helper and contrasuppressor functions.
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Selected References
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