Natural killer cells expressing the Leu-11 antigen display phagocytic activity for 2-aminoethylisothiouronium bromide hydrobromide- treated sheep red blood cells.
Natural killer (NK) cell subpopulations, identified by anti-Leu-7 and/or anti-Leu-11 monoclonal antibodies, have been investigated in immunoelectron microscopy by using a peroxidase-colloidal gold double labeling system. More than 90% of non-E rosetting/non-adherent Leu-11+ cells and approximately 60% of E rosetting Leu-11+ cells displayed phagocytic capacity for 2-aminoethylisothiouronium bromide hydrobromide treated sheep red blood cells, whereas Leu-7+ -Leu-11- cells consistently failed to ingest 2-aminoethylisothiouronium bromide hydrobromide treated sheep red blood cells. The phagocytic activity of Leu-11+ cells was not dependent on the Leu-7 antigen coexpression. Moreover, the NK capability of Leu-11+ cells has been verified. In both E rosetting and non-E rosetting/non-adherent cell populations, Leu-11+ enriched subsets displayed significantly higher NK capability when compared with Leu-11- cells. Previous reports provided evidence for different cytotoxic capability, recombinant human interleukin 2 mediated activation, and ultrastructural features of Leu-11+ cells in comparison to Leu-7+-Leu-11- cell subset. The data from the present investigation indicate that 2-aminoethylisothiouronium bromide hydrobromide treated sheep red blood cells phagocyting NK cells are confined to the Leu-11+ subset and give added strength to different function capabilities of Leu-11+ and Leu-7+-Leu-11- cells.
D000368:Aged; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface / Q000032:analysis*; D004912:Erythrocytes / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D007694:Killer Cells, Natural / Q000145:classification / Q000276:immunology* / Q000648:ultrastructure; D008854:Microscopy, Electron; D008875:Middle Aged; D010587:Phagocytosis; D010641:Phenotype; D000338:beta-Aminoethyl Isothiourea / Q000494:pharmacology*
D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D000338:beta-Aminoethyl Isothiourea