Lymphokine-activated killer (LAK) cells: interferon-gamma synergizes with interleukin-2 to induce LAK cytotoxicity in homogeneous leukemic preparations.
Clin Immunol Immunopathol
; 58(2): 278-88, 1991 Feb.
Article
em En
| MEDLINE
| ID: mdl-1898716
ABSTRACT
Lymphokine-activated killer (LAK) cells are generated by the incubation of lymphocytes with high levels of interleukin-2 (IL-2). We report here that interferon-gamma (IFN-gamma) acts synergistically with low levels of IL-2 to promote LAK differentiation in peripheral blood lymphocytes as well as in homogeneous T acute lymphocytic leukemic cells exhibiting LAK precursor reactivity. No augmentation of LAK response was observed with IFN-alpha-2, IFN-beta-1, and IFN-beta-2/IL-6. The synergism between IL-2 and IFN-gamma was expressed in the ability of activated lymphocytes to lyse natural killer resistant cell line targets and surgically removed melanoma cells. The augmented LAK response due to IFN-gamma does not reflect up-regulation of the high-affinity IL-2 receptors consisting both of alpha and beta subunits, since expression of the alpha (Tac) subunit on the responding leukemic cells was not increased by IFN-gamma. The observed IFN-gamma/IL-2 synergism in the induction of monoclonal LAK precursors suggests that a single precursor cell responds to both IFN-gamma and IL-2 and that different mechanisms underlie the basal IL-2-mediated LAK response and its enhancement by IFN-gamma.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Leucemia
/
Células Matadoras Ativadas por Linfocina
/
Interferon gama
/
Interleucina-2
/
Citotoxicidade Imunológica
Limite:
Humans
Idioma:
En
Revista:
Clin Immunol Immunopathol
Ano de publicação:
1991
Tipo de documento:
Article
País de afiliação:
Israel