SH514 is an orally active IRF4 inhibitor ( IC 50 = 2.63 μM). SH514 binds to the IRF4-DBD domain, thereby inhibiting the interaction of IRF4 protein with DNA (KD = 1.28 μM). SH514 can inhibit the proliferation of IRF4-high-expressing NCI-H929 and MM.1R cells, and displays no cytotoxicity for normal cells. SH514 significantly downregulates the expression of IRF4 downstream target genes concentration-dependently. SH514 inhibits the expression of cell cycle-related proteins CDC2, Cyclin B1 , Cyclin D1 , Cyclin E1 , and CMYC in Multiple Myeloma cells. SH514 can induce DNA damage and increase the expression of γH2AX . SH514 effectively inhibits the proliferation of multiple myeloma tumors .
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