By Henry G. Kunkel (ed.), Frank J. Dixon (ed.)
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Additional info for Advances in Immunology, Vol. 31
We analyzed this point ourselves by placing the hapten bound to the unrelated carrier protein (in our case, DNP-y-globulin) and the immunizing protein (hemocyanin), both on the same macrophage (Unanue and Katz, 1973). Using radioactive proteins, we were able to estimate that the amounts of both proteins bound to the macrophage were similar to the amount of DNP-hemocyanin bound to macrophages. The results indicated that lymphocytes would respond weakly to the unlinked hapten and carrier determinants on the same macrophage, but strongly if the determinants are bound in the same molecule (Fig.
The immune T cells in the initial host were depleted from the thoracic duct cells during the first 2 days, indicating their transient removal from the circulation, but appeared in large number by 6 days. Thus, by examining day 2 or day 6 thoracic duct cells, “negative” or “positive” selection of immune T cells could be shown. The results indicated that F, T cells would cooperate only with the B cells of the same parental strain used for the in vivo priming and supported the concept that these F, T helper cells comprised two distinct groups.
1980a). Such treated cells, however, could proliferate when a preparation of Iabearing spleen accessory cells was added to the culture. The accessory MACROPHAGES IN ANTIGENIC STIMULATION 19 cells were adherent to glass, lacked T-cell determinants, and contained two I-region determinants, one mapped to I-A, the other mapped from I-B to I-EIC. The accessory cell lacking Ia reconstituted the response but not as effectively, although, in their studies, a complete titration of each cell was not shown.
Advances in Immunology, Vol. 31 by Henry G. Kunkel (ed.), Frank J. Dixon (ed.)