SGK1 inhibitor is an inhibitor of serum- and glucocorticoid-regulated kinase 1 (SGK1) and SGK2. It is selective for SGK1 and SGK2 over SGK3 in the presence of a high concentration of ATP. SGK1 inhibitor prevents phosphorylation of GSK3β in U2OS cells and decreases cell viability in BYL719-insensitive HCC1954 cells when used in combination with the PI3Kα inhibitor BYL719. SGK1 inhibitor reduces tumor growth in an HCC1954 mouse xenograft model when administered in combination with BYL719.
CKI-7 free base is a potent and ATP-competitive inhibitor of casein kinase 1 (CK1; IC50: 6 μM; Ki: 8.5 μM) and a selective Cdc7 kinase inhibitor. CKI-7 free base also inhibits SGK, ribosomal S6 kinase-1 (S6K1), and MSK1.