Article
作者: Kaufman, Susan ; Wallweber, Heidi Ackerly ; Gibbons, Paul ; De Bruyn, Tom ; Jiang, Fan ; Rudolph, Joachim ; Zhao, Liang ; Braun, Marie-Gabrielle ; Clark, Kevin R ; Lemire, Alexandre ; Beveridge, Ramsay E ; Leclerc, Jean-Philippe ; Ashkenazi, Avi ; Wei, Wentao ; Ly, Cuong ; Fu, Liqiang ; Sims, Jessica ; Wang, Weiru ; Beresini, Maureen H ; Kiefer, James R ; Segal, Ehud ; Castanedo, Georgette ; Schwarz, Jacob B ; Kan, David
The lack of selective and safe in vivo IRE1α tool molecules has limited the evaluation of IRE1α as a viable target to treat multiple myeloma. Focus on improving the physicochemical properties of a literature compound by decreasing lipophilicity, molecular weight, and basicity allowed the discovery of a novel series with a favorable in vitro safety profile and good oral exposure. These efforts culminated in the identification of a potent and selective in vivo tool compound, G-5758, that was well tolerated following multiday oral administration of doses up to 500 mg/kg. G-5758 demonstrated comparable pharmacodynamic effects to induced IRE1 knockdown as measured by XBP1s levels in a multiple myeloma model (KMS-11).