title: Antibody-dependent lymphocyte-mediated cytotoxicity (Ab-LMC), definition of the "K cell" in the rat.
abstract: The nature and membrane characteristics of the "K cell" of antibody-dependent lymphocyte-mediated cytotoxicity (Ab-LMC) were investigated in a widely used rat model of transplantation. Treatment of sensitized effector cell populations with anti-immunoglobulin and complement eliminated K cell cytotoxicity without diminishing the component of T cell-mediated injury. EA and EAC depletion experiments, although demonstrating no loss of K cell cytotoxicity after removal of complement receptor-bearing lymphocytes, produced a marked abrogation of cytotoxicity following the removal of the Fc receptor-bearing lymphocyte pool. Studies on phagocytic properties showed K cell activity to be shared by an adherent as well as a nonadherent cell population. Thus, the Fc receptor emerged as the only constant surface marker of the rat K cell in Ab-LMC.
mesh_terms: D000818:Animals; D000918:Antibody Specificity; D002448:Cell Adhesion; D002469:Cell Separation; D003165:Complement System Proteins / Q000378:metabolism; D003601:Cytotoxicity Tests, Immunologic; D007104:Immune Adherence Reaction; D007111:Immunity, Cellular; D007141:Immunoglobulin Fc Fragments; D008214:Lymphocytes / Q000276:immunology*; D010586:Phagocytes / Q000276:immunology; D051381:Rats; D011914:Rats, Inbred BN; D011917:Rats, Inbred Lew; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D007141:Immunoglobulin Fc Fragments; D003165:Complement System Proteins