title: Interleukin 2 induces appearance of LGL/Leu11+/K562 lytic cells in Leu11- low density peripheral blood mononuclear cell population.
abstract: Low density Percoll fraction cells cultured with interleukin 2 (IL-2) showed a higher proportion of large granular lymphocytes (LGL) and higher K562 cytolytic activity, as compared to a culture lacking IL-2. Furthermore, in a negatively selected Leu11- population, derived from low density cells, cultured for 7 days in medium supplemented with lymphocyte (L) or recombinant (R) IL-2, there appeared LGL and Leu11+ cells. Moreover, some level of K562 lytic activity and higher proportion of DR+ and Tac+ cells was found as compared to lacking IL-2 culture. Cytofluorograph analysis of cells labelled with propidium iodide revealed that a proportion of the low density Leu11- starting cell population entered the growth cycle while cultured with IL-2. In addition was found that Leu11+ cells evolve during culture with IL-2 into population lacking in part this phenotype marker. The present work shows that precursors of K562 cytolytic cells lacking Leu11 antigen reside in low density cell fraction, and that they may differentiate in LGL/Leu11+ cells.
mesh_terms: D000954:Antigens, Surface / Q000032:analysis; D002454:Cell Differentiation; D003602:Cytotoxicity, Immunologic; D006801:Humans; D007113:Immunity, Innate; D007376:Interleukin-2 / Q000494:pharmacology*; D007694:Killer Cells, Natural / Q000276:immunology*; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000145:classification / Q000166:cytology / Q000276:immunology*
chemical_list: D000954:Antigens, Surface; D007376:Interleukin-2