Summary
Peripheral blood lymphocytes (PBL) from chronic myeloid leukemia (CML) patients in remission were stimulated in vitro, in a 3-cell assay with autologous leukemic cells or autologous bone marrow (BM) cells alone, or each in combination with allogeneic PBL. The responder cells were used as effectors in a 4-h 51Cr release cytotoxicity assay using autologous targets such as leukemic cells, BM cells, phytohemagglutinin-induced lymphoblasts, and allogeneic K562 (erythroblastoid leukemic cell line) target cells. Sensitization of lymphocytes from CML patients with either autologous leukemic cells or BM cells generated cytotoxic cells (CTCs) capable of killing both the targets. These results suggested that in CML, the PBL may have been sensitized to myeloid maturation-related antigens in vivo, which, on secondary stimulation in vitro, may result in differentiation of CTCs cytotoxic to immature myeloid cells, either from autologous leukemic cells or autologous BM. The inability of PBL from patients with oral cancers to lyse autologous BM cells upon in vitro stimulation, supported this possibility. Clonogenic assays conducted to assess the colony forming potential of BM cells which had interacted with CTCs indicated that there was about 37% reduction in committed granulocyte stem cell colony formation without an appreciable change in committed granulocyte/monocyte stem cell units and clusters. Therefore, since the BM toxicity of the CTCs is not very high, these cells may have a potential clinical use in CML.
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Somasundaram, R., Rao, S.G.A., Advani, S.H. et al. In vitro generation of effector cells cytotoxic to autologous targets from chronic myeloid leukemia patients in remission. Cancer Immunol Immunother 27, 177–182 (1988). https://doi.org/10.1007/BF00200024
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DOI: https://doi.org/10.1007/BF00200024