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Additional resources for Advances in Immunology, Vol. 31
It is possible, however, that in the presence of an agent like 2-ME the antigen-presenting function may be done by the B cell during its handling of antigen, particularly if these B cells are in high frequency, as in primed animals. This applies particularly to the SRBC response. Some direct evidence for B-cell presentation of antigen was presented by Kammer and Unanue (1980)but awaits further studies (see below). 4 . Induction of Helper Cells Continuing the analysis of T-B cell-macrophage interactions in culture, I will now review experiments attempting to analyze and dissect the interaction.
Induction of Helper Cells Continuing the analysis of T-B cell-macrophage interactions in culture, I will now review experiments attempting to analyze and dissect the interaction. , 1976, 1979a,b). First, T cells were cultured for 4 days with a protein antigen, resulting in the production of helper cells; the function of the helper T cell was assayed in a second culture by mixing the T cells with unprimed B cells 30 EXIIL R . UNANUE and the appropriate hapten-protein conjugate, later measuring the anti-hapten response.
The suppressor cells were also found in unfractionated spleen cells by adding a large amount of GAT. ) This last result again depicts the balance between the development of helper and suppressor T cells, depending on the way in which antigen is introduced: suppression may be favored by antigens not presented in macrophages or presented-as in the case of an excess of soluble antigen-perhaps in the context of a “wrong” antigen-presenting cell. Further analysis of the GAT system disclosed that, although no MHC restrictions were found insofar as macrophage presentation, these did take place in situations where the T and B cells came from mice primed in d u o with GAT-bearing macrophages.