SRX3305

SRX 3305 is a potent, triple BTK/PI3K/BRD4 inhibitor with IC50 of 6.5 nM, 15 nM, and 4 nM toward BTK, PI3Kɑ and PI3Kδ respectively, inhibits BRD4 BD1 and BD2 with IC50 of 77 and 95 nM.SRX3305 showed enhanced binding to the drug-resistant C481S mutant of BTK compared to SRX-3262 (IC50=9 uM and 25 uM, respectively) .SRX3305 displayed cytotoxicity aginst MCL cell lines JeKo-1, Mino, Granta with IC50 of 58 nM, 1 nM, 1.1 uM, respectively.SRX3305 inhibited cell vbiability of JeKo-1 BTK C481S and Mino BTK C481S mutant cell lines with IC50 of 1 uM and 47 nM, respectively, with minimally toxic to healthy donor PBMCs.SRX3305 showed improved efficacy in MCL and Ibrutinib-resistant MCL cells, SRX3305 impacted gene expression, perturbs the cell cycle and promotes apoptosis in MCL.