Abstract
S100A8 and S100A9 are associated with myeloid cell differentiation, chemotactic activities, adhesion of neutrophils, and apoptosis. In this study, we investigated the contribution of S100A8 and S100A9 to differentiation of the human eosinophilic leukemia cell line, EoL-1. S100A8 and S100A9 increased the number of vacuole per one cell and the protein expression of EPO and MBP. Rottlerin, an inhibitor of protein kinase C delta (PKCδ), inhibited the EoL-1 cell differentiation induced by S100A8 and S100A9. These results suggest that S100A8 and S100A9 may regulate the differentiation of eosinophilic progenitors. Moreover, these findings may shed light on elucidation of eosinophil differentiation due to S100 proteins.
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