EPZ004777

EPZ004777 is an effective and selective DOT1L inhibitor, with IC₅₀ being 0.4 nM. EPZ004777 reduces the levels of H3K79me2 and H3K79me1, significantly down-regulating the expression of HOXA9 and MEIS1. EPZ004777 selectively inhibits the proliferation of MLL rearrangement cells and promotes the differentiation and subsequent apoptosis (apoptosis) of leukemia cells. EPZ004777 can be used for the study of leukemia^[1][2][3]. IC50 & Target:IC50: 0.4 nM (DOT1L)^[1] In Vitro:EPZ004777 demonstrates potent, concentration-dependent inhibition of DOT1L enzyme activity with an IC₅₀ of 400±100 pM. EPZ004777 displays remarkable selectivity for inhibition of DOT1L over other HMTs(PRMT5, 521±137 nM; others, >50 μM). The effect of extended EPZ004777 treatment is remarkably specific for the MLL-rearranged cell lines. The number of viable MV4-11 and MOLM-13 cells is dramatically reduced by EPZ004777, whereas the growth of Jurkat cells is unaffected. A small population of MV4-11 cells remain viable in the presence of EPZ004777, but their number remain constant when growth curves are tracked over longer periods indicating that they have ceased to divide. The proliferation of MLL-AF9-transformed cells is strongly inhibited by EPZ004777 at concentrations of 3 μM or greater^[1]. EPZ004777 selectively inhibits proliferation of MLL-AF10 and CALM-AF10 transformed murine bone marrow cells^[2]. In Vivo:EPZ004777 is well tolerated and no overt toxicity is observed. Complete blood count analysis after 14 days of continuous exposure to EPZ004777 revealed a statistically significant increase in the total white blood cell count, which resulted from an increase in neutrophils, monocytes, and lymphocytes. EPZ004777 (50, 100, or 150 mg/mL) administration is well tolerated, and no significant weight loss is observed^[1].