title: Lymphokine-activated killer activity in long-term cultures with anti-CD3 plus interleukin 2: identification and isolation of effector subsets.
abstract: Peripheral blood lymphocytes cultured in recombinant interleukin 2 during 3 to 5 days (short-term cultures) develop the ability to lyse natural killer-resistant tumor lines and fresh tumor cells, i.e., express lymphokine-activated killer (LAK) function. Phenotypic analysis has shown these cells to be natural killer cells, i.e., CD16+ and/or Leu 19+ cells. CD3+,CD16- T-cells, instead, develop very low LAK function in these cultures. We recently reported the development of long-term (up to 21 days) cultured cells with LAK activity by stimulation with OKT3 + interleukin 2(IL2). These culture conditions repeatedly resulted in a several hundred-fold expansion in cell number. Specific LAK activity on Day 14 of culture was comparable to that of 3-day LAK cultures and could be further enhanced by the addition of interleukin 1 beta, beta-, or gamma-interferon. Total LAK activity was greatly increased in OKT3 + IL2 cultures over that found in short-term cultures. Isolation of effectors mediating LAK function in long-term cultures stimulated with OKT3 + IL2 showed that both CD3+,CD16- cells and CD16+,CD3- cells tested on Day 14 of culture expressed equivalent levels of LAK activity as shown by lysis of natural killer-resistant targets, HL60 and Daudi. Further dissection of the subpopulations developing LAK activity demonstrated that, in addition to CD16+,CD3- cells, CD3+, CD4-,CD8- cells and Leu 19+,CD3-,CD16- cells also developed high LAK activity in long-term cultures with OKT3 + IL2. Further, long-term culture with OKT3 + IL2 induced increases in the numbers not only of CD3+,CD4-,CD8- cells but also of CD16+,CD3- and Leu 19+,CD3-,CD16- cells. Although there is a significant increase in the number of CD3+,CD8+ cells, neither these, nor the CD3+,CD4+ cells, mediate LAK activity to the same extent as the populations mentioned above.
authors.affiliation: Immunobiology Research Center, University of Minnesota Hospital and Clinic, Minneapolis, Minnesota 55455.
authors.forename: A C
authors.initials: AC
authors.lastname: Ochoa
authors.forename: D E
authors.initials: DE
authors.lastname: Hasz
authors.forename: R
authors.initials: R
authors.lastname: Rezonzew
authors.forename: P M
authors.initials: PM
authors.lastname: Anderson
authors.forename: F H
authors.initials: FH
authors.lastname: Bach
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology*; D017252:CD3 Complex; D002460:Cell Line; D002478:Cells, Cultured; D003602:Cytotoxicity, Immunologic; D005455:Fluorescent Antibody Technique; D006801:Humans; D007376:Interleukin-2 / Q000276:immunology*; D007694:Killer Cells, Natural / Q000145:classification / Q000276:immunology*; D008213:Lymphocyte Activation; D011948:Receptors, Antigen, T-Cell / Q000276:immunology*; D011994:Recombinant Proteins / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D007376:Interleukin-2; D011948:Receptors, Antigen, T-Cell; D011994:Recombinant Proteins