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Induction of NK cell activity against fresh human leukemia in culture with interleukin 2.

E Lotzová, C A Savary and R B Herberman
J Immunol April 15, 1987, 138 (8) 2718-2727;
E Lotzová
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C A Savary
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R B Herberman
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Abstract

Natural killer (NK) cells have been implicated in defense against malignancies, especially leukemia. Because patients with leukemia and preleukemic disorders manifest low NK activity, it is possible that NK cell impairment may contribute to leukemogenesis. In view of this possibility, it was important to characterize the NK cell defect of leukemic patients and to design new approaches for its correction. Analysis of the mechanism of NK cell defect demonstrated that NK cells of leukemic patients were impaired in their tumor-binding and lytic activity and did not display ability to recycle or to produce cytotoxic factor. However, deficient NK activity could be corrected by culture of peripheral blood effector cells with IL 2. IL 2-activated NK cells manifested restoration of all measured parameters of the cytotoxic mechanism, as exemplified by normalized tumor-binding and lytic activity, as well as the rate of lysis and ability to recycle. Importantly, such in vitro stimulated cytotoxic cells displayed reactivity against fresh leukemic cells of autologous as well as allogeneic origin. Another interesting observation from these studies was that the NK activity was also induced in the leukemic bone marrow, a tissue with a very low frequency of cytotoxic NK cells. It is important to note that cultured NK cells did not represent a stationary cell population, but proliferated in vitro quite actively (doubling time 3 to 6 days) for at least 5 wk. Characterization of the in vitro generated cytotoxic cells indicated that these cells displayed large granular lymphocyte morphology and CD16 and Leu-19 cell surface phenotype. Our data demonstrate that the NK cell defect of leukemic patients is not a permanent phenomenon, but can be reversed in culture with IL 2, and that fully cytotoxic NK cells can be maintained and expanded in vitro. Thus, it is reasonable to suggest that adoptive transfer of autologous NK cells to the patients may represent a promising new therapy for treatment of leukemia.

  • Copyright © 1987 by American Association of Immunologists

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The Journal of Immunology
Vol. 138, Issue 8
15 Apr 1987
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Induction of NK cell activity against fresh human leukemia in culture with interleukin 2.
E Lotzová, C A Savary, R B Herberman
The Journal of Immunology April 15, 1987, 138 (8) 2718-2727;

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Induction of NK cell activity against fresh human leukemia in culture with interleukin 2.
E Lotzová, C A Savary, R B Herberman
The Journal of Immunology April 15, 1987, 138 (8) 2718-2727;
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Print ISSN 0022-1767        Online ISSN 1550-6606