BMS-536924S1012

BMS-536924 also inhibits FAK and Lck with IC50 of 150 nM and 341 nM, respectively. BMS-536924 inhibits cellular proliferation and disrupts Akt and MAPK phosphorylation. ^[1] BMS-536924 inhibits IGF-I-stimulated IGF-1R signaling in MCF10A cells and blocks constitutive IGF-1R activity in CD8-IGF-1R-MCF10A. Preincubation of MCF10A cells with 1 μM BMS-536924 completely blocks the ability of IGF-I to stimulate IGF-1R phosphorylation. IGF-I stimulation results in increased phosphorylation of ERK1/2, GSK3β, and Akt. BMS-536924 inhibits this ligand-induced phosphorylation. Treatment of the CD8-IGF-1R-MCF10A cells with BMS-536924 results in a dose-dependent inhibition of phosphorylation with partial inhibition at 0.01 μM and 0.1 μM, but complete receptor inhibition at a concentration of 1 μM. Maximal inhibition of phosphorylated IGF-1R is observed as early as 10 minutes following incubation. BMS-536924 retains its ability to inhibit IGF-1R phosphorylation for up to 48 hours. Addition of BMS-536924 time-dependently inhibits Akt phosphorylation starting at 1 hour. By 48 hours, Akt activation is completely blocked. ^[2] Treatment with BMS-536924 shows antiproliferation activity in a panel of cancer cell lines including TC32, HT1080/S, SK-LMS-1, H513 and CTR cells. pIGF-1R/pIR is activated upon IGF-I/insulin stimulation and the activation is inhibited by BMS-536924 at similar potencies in Rh41 and Rh36 cell lines. The expression of programmed cell death 4 (PDCD4), cleavage of poly(ADP-ribose) polymerase (PARP) and caspase-3 are up-regulated in Rh41 cells treated with BMS-536924. ^[3]