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Download Advances in Immunology, Vol. 31 by Henry G. Kunkel (ed.), Frank J. Dixon (ed.) PDF

By Henry G. Kunkel (ed.), Frank J. Dixon (ed.)

ISBN-10: 0120224313

ISBN-13: 9780120224319

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1976; Rosenstreich and Mizel, 1978). Further analysis by Rosenstreich and associates indicated that a soluble mediator was involved in the interaction between macrophages and lymphocytes and PHA. Separating macrophages and the PHAtreated lymphocytes b y a cell-impermeable membrane resulted in lymphocyte proliferation to about 60% of that found when both cells were mixed. Furthermore, a soluble molecule, named TAF or T cellactivating molecule, released &om macrophage cultures replaced the physical need for macrophages.

Thus, macrophages syngeneic with the T cells were required for the response to soluble hemocyanin-or the synthetic polypeptide (TG)-A-L (Erb and Feldman, 1975a,b). By mixing syngeneic and allogeneic macrophages, it was found that the lack of response by allogeneic macrophages could not be attributed to a suppressor effect. Furthermore, using strains of congenic mice with intra-H-2 recombinations, it was possible to map the locus controlling the interactions to the I-A region of H-2 (Erb and Feldman, 1975~).

In these experiments, al- MACROPHAGES IN ANTIGENIC STIMULATION 35 logeneic macrophages presented haptenated hemocyanins effectively to immune spleen cells that were not fractionated or were not stringently depleted of macrophages and, therefore contained syngeneic macrophages. The possibility was raised of transfer of antigen from the allogeneic to the syngeneic macrophages (or B cells) (Unanue, 1978). Indeed, this system has been used to support a pathway of presentation of antigen from macrophages to another antigen-presenting cell not involving an MHC-restricted interaction (Section 111,B).

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