title: Abnormal cytolytic activity of lymphocyte function-associated antigen-1-deficient human cytolytic T lymphocyte clones.
abstract: The involvement of the lymphocyte function-associated antigen-1 (LFA-1) membrane molecule in cytolytic T lymphocyte (CTL) interactions with lymphoid target cells was investigated using CTL clones derived from two patients with a heritable deficiency of LFA-1. LFA-1 surface expression on the CTL clones was 1% of the normal level of LFA-1, unchanged with prolonged culture, and identical on 14 different CTL clones. The function of the LFA-1 molecule was addressed using the LFA-1-deficient CTL clones and LFA-1-deficient lymphoid target cells. The lytic activity of the LFA-1-deficient CTL clones was 43% of control when tested against a target cell line expressing normal levels of LFA-1 and less than 10% of control when tested against an LFA-1-deficient target cell line. These results demonstrate a direct involvement of LFA-1 in CTL-mediated cytolysis and suggest a more general dependence on LFA-1 in lymphoid cell-cell interactions.
mesh_terms: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface / Q000032:analysis / Q000276:immunology*; D002478:Cells, Cultured; D002999:Clone Cells; D003470:Culture Media; D003602:Cytotoxicity, Immunologic; D006801:Humans; D007376:Interleukin-2 / Q000276:immunology; D016169:Lymphocyte Function-Associated Antigen-1; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D003470:Culture Media; D007376:Interleukin-2; D016169:Lymphocyte Function-Associated Antigen-1