Abstract
ITR‑284 is a carboxamide analog that can inhibit proliferation in human promyelocytic leukemia HL-60 cells. To understand the effects and molecular mechanisms of ITR‑284 in human erythromyeloblastoid leukemia, we treated K562 cells with different concentrations of ITR‑284 (0, 2, 4, 6, 8 and 10nM) and all-trans retinoic acid (ATRA) (0, 0.1, 0.5, 1, 5 and 10µM) for 24h. The IC50 of ITR‑284 was ~10nM in K562 cells treated for 24h as determined by MTT assay. May-Grünwald-Giemsa staining and nitro blue tetrazolium (NBT) assays were used to determine cell morphology changes and differentiation after ITR‑284 and ATRA treatment. In addition, mRNA expression levels of hematopoietic factors, including GATA‑1, NF-E2 and GATA‑2, were elevated, while expression levels of BCR‑ABL were downregulated in K562 cells after 24h of treatment with ITR‑284 as determined by quantitative reverse transcription polymerase chain reaction. In addition, western blot analyses showed that FOXM1, GLI1 and c-MYC protein levels were decreased by ITR‑284. Taken together, our data show that ITR‑284 induced K562 cell differentiation, which led to decreased tumorigenesis. Our findings suggest that ITR‑284 could be a potential candidate for treating chronic myelogenous leukemia.
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