Human peripheral blood eosinophils produce and release interleukin-8 on stimulation with calcium ionophore

European Journal of Immunology
R K BraunC Walker

Abstract

We present evidence that human blood eosinophils produce interleukin (IL)-8 when stimulated with calcium ionophore. Following in vitro culture of 99% pure eosinophils with calcium ionophore, released IL-8 was detectable by enzyme-linked immunosorbent assay in supernatants. Eosinophil IL-8 production was considerably greater than that of IL-3 or granulocyte macrophage colony-stimulating factor. Furthermore, eosinophil production of IL-8 in the presence of calcium ionophore could be inhibited with the immunomodulating agent cyclosporin A and the protein synthesis inhibitor cycloheximide. In addition, following stimulation of highly purified blood eosinophils with calcium ionophore, IL-8 mRNA was detectable after polymerase chain reaction amplification. In comparison with other cells on stimulation with calcium ionophore, eosinophils produce about half as much IL-8 as neutrophils but significantly more than purified T cells. In contrast to monocytes and neutrophils, IL-8 production was not inducible with IL-1 or tumor necrosis factor. Finally, following calcium ionophore stimulation blood eosinophils were shown to contain cytoplasmic IL-8 by employing a monoclonal antibody against IL-8 in conjunction with immunohistochemistry. The...Continue Reading

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