p56(lck) is not essential for the T-cell response to allo-MHC antigens

Abstract

In mice lacking the src family protein tyrosine kinase, p 56(lck) (lck(-/-)), a greatly reduced number of peripheral T cells is observed due to a profound blockage of the thymocyte development. The peripheral T cells in lck(-/-) mice exhibit proliferative response after T-cell receptor (TCR)- crosslinking, but can not respond to viral antigens. In this report, we examined the allo-responses of peripheral T cells in the lck(-/-) mice and the following results were thus obtained. (1) After an intravenous injection of fully allogeneic [allo-major histocompatability complex (MHC)] spleen cells, an increase of interleukin (IL)-2Rα+ cells was observed in both the CD4+ or CD8+ peripheral T cells of the lck(-/-) mice and the increase was similar to those in the lck(+/+) littermate, with only a somewhat delayed and prolonged time kinetics observed in the CD4+ T cells of the lck(-/-) mice. (2) the lck(-/-) mice rejected the fully allogeneic trunk skin grafts several days later than the lck(+/+) mice, but did not reject the minor allogeneic grafts. (3) The peripheral T cells of the graft-rejected lck(-/- ) mice exhibited a weaker but significantly proliferative response, while the cytotoxic T lymphocyte (CTL) activities to allo-MHC antigens in vitro were comparable to those in lck(+/+) mice. While the response to the minor allo-antigens was shown by the peripheral T cells in the lck(+/+) mice with minor allogeneic skin grafts but not by those in the lck(-/-) mice with the grafts. These results thus suggest that p56(lck) is not essential for peripheral T cells to both respond and exhibit effector functions to allo- MHC antigens.