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. 1988 Sep;27(2):183–189. doi: 10.1007/BF00200025

Propagation of cytotoxic effectors from chronic myeloid leukemia patients and cloning of cytotoxic T cells

R Somasundaram 1, Suresh H Advani 2, Sudha G Gangal 1,✉
PMCID: PMC11038846  PMID: 3262015

Abstract

Cytotoxic cells (CTCs) generated from peripheral blood lymphocytes of 5 chronic myeloid leukemia (CML) patients in remission on stimulation with autologous leukemic cells and allogeneic lymphocytes (3-cell assay), were propagated in vitro in interleukin-2 (IL-2)-containing medium and periodic stimulation with autologous leukemic cells, for a period of 4 to 6 months. During this period, the cells were assessed for phenotype and for cytotoxic responses in a 4-h 51Cr release microcytotoxicity assay. The CTCs continued to show specific lysis of autologous leukemic cells and bone marrow (BM) cells. However, the nonspecific lysis of natural killer (NK) targets and the proportion of cells showing NK phenotype (HNK-1 antigen) increased progressively on cultivation in IL-2-containing medium. Therefore cells showing CD8 phenotype and specific cytotoxic function were segregated by cloning CTCs under the condition of limiting dilution in the presence of allogeneic feeder cells and IL-2-containing medium. Three cytotoxic T cell (CTL) clones expressing CD3+, CD8+, and HLA DR+ phenotypes were obtained from CTCs of 2 CML patients. These clonoid populations, maintained in IL-2-containing medium and periodic antigenic stimulation with autologous leukemic cells, showed specific lysis of autologous leukemic cells and BM cells even at lower (10:1) effector:target ratios. They did not kill K562 (erythroblastoid leukemic NK target cell line) cells and autologous phytohemagglutinin-induced blasts. These clones apparently functioned in an MHC-restricted manner as they did not lyse allogeneic CML cells which would also express a similar set of maturation antigens if sensitization was, as it appeared, against these antigens. Finally, interaction of autologous BM cells with CTL clones reduced the colony forming potential of BM cells only to the extent of 18%–30%. The results therefore indicate that such CTL clones can possibly be used in adoptive immunotherapy as they showed minimal BM toxicity.

Keywords: Natural Killer, Chronic Myeloid Leukemia, Bone Marrow Cell, Chronic Myeloid Leukemia Patient, Chronic Myeloid Leukemia Cell

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