title: Lymphocyte leukocyte function-associated antigen 1 interacting with target cell intercellular adhesion molecule 1 co-activates cytolysis triggered via CD16 or the receptor involved in major histocompatibility antigen-unrestricted lysis.
abstract: The binding of leukocyte function-associated antigen 1 (LFA-1) (CD11a/CD18) to its natural target ligand, intercellular adhesion molecule 1 (ICAM-1) (CD54), is an important step in lymphocyte adhesion to cells and its subsequent activation. We studied whether LFA-1-ICAM-1 interactions affect tumor cell susceptibility to MHC-unrestricted lysis by TCR-CD3-CD16+ natural killer (NK) and TCR gamma delta + CD3+ CD16+/- lymphocytes. Moreover, tumor target cell susceptibility to anti-CD16 mAb-triggered lysis by TCR- NK cells was investigated. Therefore, ICAM-1+ or ICAM-1- tumor cell lines were used as target cells. Two melanoma-derived cell lines expressing little or no ICAM-1 were relatively resistant to MHC-unrestricted lysis as well as anti-CD16 mAb-triggered lysis by fresh or cloned TCR- NK cells. The ICAM-1- melanoma cell line was also relatively resistant to MHC-unrestricted lysis by TCR gamma delta + clones. Tumor necrosis factor (TNF) induced ICAM-1 expression on ICAM-1- tumor cells, and simultaneously increased target cell susceptibility to MHC-unrestricted as well as to anti-CD16 mAb-triggered lysis. This enhanced level of lysis was inhibited by anti-ICAM-1 mAb. Our data demonstrate that LFA-1-ICAM-1 interactions increase MHC-unrestricted or CD16-mediated cytolysis of tumor cells. Anti-CD18 interactions increase MHC-unrestricted or CD16-mediated cytolysis of tumor cells. Anti-CD18 (LFA-1 beta) mAb inhibited MHC-unrestricted lysis of ICAM-1+ and ICAM-1- tumor cells.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Immunology, Dr. Daniel den Hoed Cancer Center, Rotterdam, The Netherlands.
authors.forename: P S
authors.initials: PS
authors.lastname: Goedegebuure
authors.forename: E
authors.initials: E
authors.lastname: Braakman
authors.forename: D M
authors.initials: DM
authors.lastname: Segal
authors.forename: R J
authors.initials: RJ
authors.lastname: Vreugdenhil
authors.forename: R L
authors.initials: RL
authors.lastname: Bolhuis
mesh_terms: D015703:Antigens, CD / Q000502:physiology*; D000943:Antigens, Differentiation / Q000502:physiology*; D015815:Cell Adhesion Molecules / Q000502:physiology*; D003602:Cytotoxicity, Immunologic; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma / Q000494:pharmacology; D016169:Lymphocyte Function-Associated Antigen-1 / Q000502:physiology*; D008545:Melanoma / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000502:physiology*; D011961:Receptors, Fc / Q000502:physiology*; D017452:Receptors, IgG; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D015815:Cell Adhesion Molecules; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D016169:Lymphocyte Function-Associated Antigen-1; D011948:Receptors, Antigen, T-Cell; D011961:Receptors, Fc; D017452:Receptors, IgG; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma