title: Nonspecific cytotoxic cells in fish (Ictalurus punctatus). II. Parameters of target cell lysis and specificity.
abstract: Fish nonspecific cytotoxic cells (NCC) lyse various transformed human B-cells (NC-37, P3HR-1) and erythroblastoid cells (K562) as well as mouse YAC-1 and P815 cells. Highest NCC activity was found in the anterior (head) kidney, but spleen cells and peripheral blood leucocytes (PBL) also demonstrated cytolytic abilities. Lysis of chromium-51 labeled target cells occurred rapidly and optimum cytolysis developed at either 16 degrees C or 26 degrees C incubation temperatures. Preincubation at temperatures of 4 degrees C or 37 degrees C for 4 hours reduced NCC cytotoxicity. Although catfish (Ictalurus punctatus) are extensively outbred, interfish NCC activities did not significantly vary at the optimum E:T ratios (160). The NCC target antigen specificities were partially determined by cold target inhibition (CTI) studies. YAC-1 and K562 did not produce significant CTI, however. These studies demonstrated the presence of a highly active cytotoxic cell which is widely distributed in fish lymphoreticular tissue. NCC kill divergent kinds of transformed cell types, and the target cell specificity for human transformed B-cells is different from the NCC target cell antigens on other human (K562) and on mouse (YAC-1 and P815) cells.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D000939:Epitopes; D005260:Female; D005399:Fishes / Q000276:immunology*; D006801:Humans; D007111:Immunity, Cellular; D007694:Killer Cells, Natural / Q000276:immunology; D008297:Male; D051379:Mice; D009374:Neoplasms, Experimental; D013045:Species Specificity; D013154:Spleen / Q000276:immunology
chemical_list: D000939:Epitopes