Abstract
Allotype suppressor T cells (Ts) generated in SJL X BALB/c mice specifically suppress production of antibodies marked with the Ig-1a allotype. The studies presented here show that allotypes Ts suppress by specifically removing helper T cell (Th) activity required to facilitate differentiation and expansion of B cells to Ig-1b antibody- forming cells. We show first that Ts and Th belong to different T-cell subclasses as defined by Ly surface antigens. Ts are Ly2+Lyl- and thus belong to the same subclass as cytotoxic precursor and effector cells; Th are Lyl+Ly2- cells and thus belong to the subclass containing cells which can exert helper functions and initiate delayed hypersensitivity reactions. Placing these cells in these two subclasses shows that Th are different from Ts and suggests that they play different roles in regulating antibody responses. The difference in these roles is defined by the evidence presented here showing that Ts attack Th and regulate the antibody response by specifically regulating the availability of Th activity. We show that in allotype suppressed mice, Ts which suppress Ig-1b antibody production have completely removed the Th activity of helping Ig-1b cells without impairing Th activity which helps other IgB B cells. These findings imply the existence of allotype-specific Th for Ig-1b cells (Ig-1b Th). We directly establish that Ig-1b cells require such help by showing that carrier-primed spleen cells from Iga/Iga congenic hybrids help Ig-1a B cells from hapten-primed Igb/Iga donors but do not help Ig-1b B cells from the same donor in the same adoptive recipient.
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