PMID: 7543541Aug 15, 1995Paper

IL-3, IL-5, and granulocyte-macrophage colony-stimulating factor potentiate basophil mediator release stimulated by eosinophil granule major basic protein

The Journal of Immunology : Official Journal of the American Association of Immunologists
E U SarmientoL L Thomas

Abstract

We have examined the potential of IL-3, IL-5, and granulocyte-macrophage (GM)-CSF to enhance basophil activation by eosinophil granule major basic protein (MBP). Preincubating basophil-containing mononuclear cells with 0.01 to 10 ng/ml IL-3 or IL-5 for 15 min at 37 degrees C caused a concentration-dependent enhancement of histamine release stimulated by 1.5 microM MBP. Statistically significant enhancement was evident at 1 ng/ml and was maximal at 10 ng/ml. Preincubation with GM-CSF similarly enhanced MBP-induced histamine release. A 10- to 15-min preincubation with IL-5 maximally increased the level of MBP-stimulated histamine release. Preincubation of cells with 10 ng/ml IL-3 or IL-5 reduced the MBP concentrations required for histamine release by three- to fourfold and enhanced the rate of MBP-induced histamine release. MBP-stimulated histamine release before or after cytokine priming was independent of cytotoxicity as measured by 51Cr release. Consistent with a direct action of the cytokines on basophils, flow cytometric analysis demonstrated the presence of IL-3 and GM-CSF receptors on basophils. MBP also stimulated low levels of leukotriene C4 (LTC4) release from basophils of 84 to 99% purity, and experiments using enrich...Continue Reading

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