Summary
We investigated the ability of the TALL-103/2 and TALL-104 leukemic cell lines to produce lymphokines in response to activation signals, such as tumor cells and anti-CD3 (OKT3) or -CD2 (B67.1) monoclonal antibodies (mAb) or both. Both cell lines were found to produce high levels of interferon (IFN)-γ, tumor necrosis factor (TNF)-α, and granulocyte-macrophage colony-stimulating factor (GM-CSF). The latter lymphokine is induced by lysable tumor cells and by immobilized OKT3 and B67.1 mAb only in the presence of interleukin (IL-2). IFN-γ and TNF-α are induced upon CD3 but not CD2 stimulation, both in the presence and absence of IL-2. Interestingly, the B67.1 mAb amplifies the OKT3-induced responses by 2- to 10-fold, bringing the IFN-γ and TNF-α levels of production up to 200 U/ml. Thus, simultaneous triggering of the CD2 and CD3 signaling pathways results in a very efficient lymphokine release. Of all the tumor cell lines tested as inducers, only K562 cells are able to stimulate the production of IFN-γ and TNF-α in TALL-103/2 and TALL-104 cells, especially upon culture in IL-2. Lymphokine mRNA expression after stimulation with mAb or K562 cells peaks at 2 h in both cell lines. No messages are detectable in TALL-103/2 cells at 8 h, whereas in TALL-104 cells, IFN-γ and GM-CSF transcripts are still present at 8 and 20 h, respectively. The inducible and highly regulatable expression of lymphokine release by these cell lines provides a unique model for studying mechanisms of lymphokine induction by different biological agents.
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Cesano, A., Santoli, D. Inducible expression of granulocyte-macrophage colony-stimulating factor, tumor necrosis FACTOR-α, and INTERFERON-γ in two human cytotoxic leukemic T-cell lines. In Vitro Cell Dev Biol - Animal 28, 657–662 (1992). https://doi.org/10.1007/BF02631042
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DOI: https://doi.org/10.1007/BF02631042