Exploiting the 7-methylimidazo[1,5-a]pyrazin-8(7H)-one scaffold for the development of novel chemical inhibitors for Bromodomain and Extraterminal Domain (BET) family

Add time:08/28/2019    Source:sciencedirect.com

The bromodomain and extraterminal (BET) family of proteins play a crucial role in promoting gene expression of critical oncogenes. Novel BET bromodomain inhibitors with excellent potency, drug metabolism and pharmacokinetics (DMPK) properties were in strong need for development. We reported a series of potential BET inhibitors through incorporation of imidazole into pyridine scaffold. Among them, a novel BET inhibitor with 7-methylimidazo[1,5-a]pyrazin-8(7H)-one core, compound 28, was considered to be the most promising for in-depth study. Compound 28 exhibited excellent BRD4-inhibitory activity with IC50 value of 33 nM and anti-proliferation potency with IC50 value of 110 nM in HL-60 (human promyelocytic leukemia) cancer cell lines. Western Blot indicated that compound 28 can effectively trigger apoptosis in BxPc3 cells by modulating the intrinsic apoptotic pathway. In conclusion, these results suggested that compound 28 has merely potential for leukemia treatment.

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