title: Spontaneous cytotoxicity of human peripheral blood mononuclear cells for the lymphoblastoid cell line CCRF-CEM: augmentation by bacterial lipopolysaccharide.
abstract: Spontaneous cell-mediated cytotoxicity (SCMC) of human peripheral blood mononuclear cells for a poor target, CCRF-CEM, a lymphoblastoid cell line, was rapidly and markedly elevated by E. coli lipopolysaccharide (LPS). SCMC for K562, a myeloid cell line sensitive to SCMC, was only slightly elevated by LPS. The cytotoxicities of both adherent and non-adherent mononuclear cells for CCRF-CEM were elevated. A response to LPS was found in Fc gamma R-positive and Fc gamma R-negative T cells. LPS increased the binding of non-adherent cells to both targets, but analysis of the binding suggests that a subsequent step, either triggering of the cytotoxic mechanisms or susceptibility of the target was the basis for the increased SCMC.
mesh_terms: D000328:Adult; D002448:Cell Adhesion / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival; D003602:Cytotoxicity, Immunologic / Q000187:drug effects*; D004306:Dose-Response Relationship, Immunologic; D004926:Escherichia coli; D006801:Humans; D007945:Leukemia, Lymphoid / Q000473:pathology; D008070:Lipopolysaccharides / Q000494:pharmacology*; D009000:Monocytes / Q000276:immunology*
chemical_list: D008070:Lipopolysaccharides