EPZ-5676 is a novel small molecule inhibitor of DOT1L. EPZ-5676 has an inhibition constant value of 80 pM, and demonstrates 37000-fold selectivity over all other methyltransferases tested. EPZ-5676 inhibits proliferation of MLL-AF4 rearranged cell line MV4-11 with an IC50 of 9 nM. EPZ-5676 reduces H3K79 dimethylation with a cellular IC50 of 2.6 nM in MV4-11 cells. EPZ-5676 blocks the activity of the histone lysine-methyltransferase DOT1L, thereby inhibiting H3K79 methylation and MLL-fusion target gene expression and demonstrated potent cell killing that was selective for acute leukemia lines bearing MLL translocations. Continuous IV infusion of EPZ-5676 in a rat xenograft model of MLL-rearranged leukemia caused complete tumor regressions that were sustained well beyond the compound infusion period with no significant weight loss or signs of toxicity. EPZ-5676 is a potential treatment of MLL-rearranged leukemia and is under clinical investigation.
|Cell lines||MV4-11 cells|
|Preparation method||Quantitative real-time polymerase chain reaction (qRT-PCR). To assess inhibition of HOXA9 and MEIS1 messenger RNA (mRNA) expression by EPZ-5676, exponentially growing MV4-11 cells were seeded in 75-cm2 culture flasks at 2 × 105 cells/mL and incubated in the presence of 0.2% DMSO or increasing concentrations of EPZ-5676. On day 4, cells were maintained in log phase culture by reseeding at 5 × 105 cells/mL and compound was replenished. On day 6, cells were harvested, total RNA extracted, and HOXA9 and MEIS1 mRNA levels assessed and normalized to the β2-microglobulin by qRT-PCR as previously described.|
|Incubation time||3 days|
|Animal models||Rat MV4-11 xenograft models|
|Formulation||5% hydroxypropyl-β-cyclodextrin in saline|
|Administration||IV infusion into the femoral vein continuously (24 hours/day), or intermittently (8 hours/day).|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
Potent inhibition of DOT1L as treatment of MLL-fusion leukemia.
Daigle SR, et al. Blood. 2013 Aug 8;122(6):1017-25. PMID: 23801631.
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