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The Journal of Immunology, Vol 137, Issue 10 3290-3294, Copyright © 1986 by American Association of Immunologists
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DS Silberstein, WF Owen, JC Gasson, JF DiPersio, DW Golde, JC Bina, R Soberman, KF Austen and JR David
Culture medium conditioned by activated human T lymphocytes enhances the in vitro cytotoxicity of purified human eosinophils toward Schistosoma mansoni larvae, suggesting the existence of a mechanism for T lymphocyte regulation of eosinophil function. Here we show that purified biosynthetic (recombinant) human T lymphocyte granulocyte- macrophage colony-stimulating factor (GM-CSF) enhanced markedly two eosinophil functions: cytotoxicity toward schistosomula by a mean of 676%, and calcium ionophore A23187-induced generation of leukotriene C4 (LTC4) by a mean of 135%. Augmentation of each eosinophil function by GM-CSF was time- and dose-dependent, with a dose-response relationship at concentrations between 1 and 20 pM. Tumor necrosis factor (TNF) enhanced eosinophil cytotoxicity with slower kinetics, a different dose- dependence relationship, and to a lower maximum, as compared with GM- CSF. There was no detectable effect of TNF on calcium ionophore A23187- induced generation of LTC4. The effect of GM-CSF on arachidonic acid metabolism to LTC4 reached a plateau with 60 min of incubation before stimulation with ionophore, and was characterized by an initial augmentation of the intracellular level of LTC4 and a subsequent increment in extracellular LTC4. Thus, GM-CSF can serve as a mediator for T lymphocyte regulation of functions of mature eosinophils. It is also the first defined macromolecule known to enhance metabolism of membrane-derived arachidonic acid via the 5-lipoxygenase pathway.
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