Induction of myeloid differentiation in radioresistant HL60 cells (Res-HL60) was examined to clarify the developmental mechanism of radioresistant leukemia. Compared to wild-type HL60 cells (Wt-HL60), Res-HL60 were smaller and strongly expressed CD38. Under all-trans retinoic acid (ATRA) stimulation, Res-HL60 continued to proliferate slowly and with similar level of CD11b expression to Wt-HL60. Phorbol 12-myristate 13-acetate (PMA) strongly suppressed proliferation of Res-HL60, downregulated CD14, and affected mRNA expression. These results suggested that the specific myeloid differentiation of Res-HL60 suppressed monocyte lineage by ATRA and PMA occurred through regulation of mRNA expression.
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