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In this study, we measured hydrogen peroxide (H2O2) release as one of the functions of mature eosinophils, and utilized it as a quantitative index. We demonstrated that 1) the human eosinophilic leukemia cell line, EoL-1, did not release H2O2 when stimulated with phorbol myristate acetate (PMA), but after culturing with tumor necrosis factor (TNF) and interferon-gamma (IFN-gamma) it acquired the ability to release H2O2; 2) the ability to release H2O2 was time dependent and reached a peak after 4 days of culture; 3) administration of TGF-beta or GM-CSF, with TNF and IFN-gamma enhanced the PMA-induced release of H2O2 from EoL-1. To examine the potential relationship between c-myc gene expression and induction of the ability to release H2O2, Northern analysis of c-myc gene expression in EoL-1 cocultured with TNF and IFN-gamma was performed. The results showed that the c-myc gene was spontaneously expressed in EoL-1, and the level of c-myc mRNA was markedly reduced after the cells were cocultured with TNF and IFN-gamma, suggesting that the decrease of the c-myc mRNA level is closely associated with induction of the ability to release H2O2.

cell structure and function

The Effect of Cytokines on the Differentiation of an Eosinophilic Leukemia Cell Line (EoL-1) is Associated with Down Regulation of c-myc Gene Expression.