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A CB6F1 murine T-cell hybridoma, FN1-18, secreting interleukin 2 in response to presentation of keyhole limpet hemocyanin (KLH) by syngeneic cells in the context of an I-E gene complementation product, also exhibited a major histocompatibility complex-restricted response to KLH presented by human leukocytes. The murine restriction element was I-E beta b or k E alpha d or k. The KLH-induced interleukin 2 production was inhibited by the monoclonal antibody 17-3-3s with similar but not identical anti-I-E specificity. This antibody reacted with human Ia-like antigens on T-depleted mononuclear cells in 10 of 30 humans, as assessed by immunofluorescence. The presence of the epitope recognized by antibody 17-3-3s was closely correlated with MT3 allospecificity. The ability of human cells to present KLH to the murine hybridoma strongly correlated (r = 0.768) with the expression of this epitope and was also inhibited by 17-3-3s. Another monoclonal antibody, 109d6, of the same isotype and with related but not identical MT3 specificity, caused only limited inhibition. The ability of human cells to present KLH segregated as a dominant trait linked to the major histocompatibility complex. The results indicate that the restriction element recognized by FN1-18 on both human and mouse cells is a determinant closely related to but not identical with the antigenic determinant to which 17-3-3s binds. This determinant is not influenced by the considerable species differences in the remainder of the Ia molecules.

proceedings of the national academy of sciences of the united states of america

Antigen presentation by murine and human cells to a murine T-cell hybridoma: demonstration of a restriction element associated with a major histocompatibility complex class II determinant(s) shared by both species.