Kira8

Kira8 is a mono-selective IRE1α inhibitor that allosterically attenuates IRE1α RNase activity (IC50: 5.9 nM) . (In Vitro) :Kira8 more effectively causes IRE1α-driven apoptosis in INS-1 cells than KIRA6 and also reverses XBP1 splicing promoted by GNF-2. Kira8 blocks IRE1α oligomerization and effectively inhibits IRE1α RNase activity against XBP1 and Ins2 RNAs. (In Vivo) :One week of treatment of pre-diabetic NODs mice with Kira8 (50 mg/kg; i.p.; once a day) causes obvious reductions in islet XBP1 splicing and TXNIP mRNAs. It also preserves Ins1/Ins2, BiP, and MANF mRNAs. Male Ins2+/Akita mice are injected i.p. with KIRA8 (50 mg/kg; daily; for 35 days), obviously reduction of hyperglycemia becomes apparent over several weeks.