title: p56lck is not essential for the T-cell response to allo-MHC antigens.
abstract: In mice lacking the src family protein tyrosine kinase, p 56lck (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)-2R alpha+ 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 p56lck is not essential for peripheral T cells to both respond and exhibit effector functions to allo-MHC antigens.
authors.affiliation: Department of Immunology, Kyushu University, Fukuoka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamada
authors.forename: Y Y
authors.initials: YY
authors.lastname: Kong
authors.forename: K
authors.initials: K
authors.lastname: Kishihara
authors.forename: T W
authors.initials: TW
authors.lastname: Mak
authors.forename: K
authors.initials: K
authors.lastname: Nomoto
mesh_terms: D000818:Animals; D002455:Cell Division / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D006084:Graft Rejection / Q000276:immunology; D006649:Histocompatibility Antigens / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck) / Q000172:deficiency* / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D008817:Mice, Mutant Strains; D016038:Skin Transplantation / Q000276:immunology; D013154:Spleen / Q000276:immunology / Q000637:transplantation; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006649:Histocompatibility Antigens; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck)