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The Journal of Immunology, Vol 131, Issue 2 617-621, Copyright © 1983 by American Association of Immunologists

ARTICLES

Maturation of cytotoxic T cells within sponge matrix allografts

NL Ascher, S Chen, RA Hoffman and RL Simmons

Two parallel events may provide cytotoxic effector cells at the site of allograft challenge: 1) the migration of effector cells to the graft, and 2) the local maturation of effector cells. Various experimental conditions were manipulated to ascertain the relative role of local maturation of precytotoxic cells at the site of alloantigen challenge. A C57BL/6 allogeneic-coated sponge matrix allograft was placed in a BALB/c animal. The entire animal with the sponge was subjected to sublethal irradiation, or alternatively, just the animal was subjected to the same dose of irradiation, and the sponge was shielded. The data demonstrate that by day 5, precytotoxic cells directed against donor alloantigen appears within the sponge matrix allograft. These precytotoxic cells are in themselves x-ray sensitive, but in the absence of irradiation and in the absence of further contributions from the host can develop into mature cytotoxic cells with specificity limited to that of donor alloantigen. The relative role of local maturation vs continued influx of mature cytotoxic cells cannot be determined from these sets of experiments. These data, however, show that there is potential for local development of mature cytotoxic cells in the absence of other host influences.


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