Fig. 2. CKIε inhibition prevents phosphorylation of the Akt target GSK3β.
MCF7 cells were transiently transfected with CKIε and/or incubated with insulin as shown below. Pathway activation was measure by phosphorylation of GSK3β at Ser 9 (bottom 2 bands). Inhibition of CKIε by IC261 resulted in GSK3β phosphorylation levels similar to those in the absence of insulin, suggesting that both may be required for maximum signal strength.