NVP-AEW541

NVP-AEW541 (AEW541 ) is an orally active inhibitor of the insulin-like growth factor 1 receptor (IGF-1R) with an IC₅₀ value of 0.15 μM. NVP-AEW541 also inhibits InsR, IC₅₀ with a value of 0.14 μM. NVP-AEW541 has antitumor activity^[1]. IC50 & Target:IC50: 0.15 ±0.036 μM (IGF-IR), 0.14±0.039 μM (InsR), 0.42±0.11 μM (Flt-3), 2±0.61 μM (PDGFR), 2.4±0.38 μM (c-Src), 3.3±1.4 μM (c-Kit)^[1] In Vitro:NVP-AEW541 inhibits the in vitro kinase activity of the recombinant IGF-IR kinase domain with an IC50 value of 0.15 μM and to be equipotent against the recombinant InsR kinase domain. NVP-AEW541 is confirmed active toward the IGF-IR kinase (IC₅₀=86 nM) and shown to be selective at the cellular level. Indeed, NVP-AEW541 is found to be 27-fold more potent toward the native IGF-IR, as compared to the structurally related native InsR (IC₅₀=2.3 μM). NVP-AEW541 suppresses the IGF-I-mediated survival, soft agar and proliferation of MCF-7 cells with IC₅₀ of 0.162 μM, 0.105 μM and 1.64 μM, respectively^[1]. In Vivo:Oral administration of NVP-AEW541 (20, 30, or 50 mg/kg) results in abrogation of basal and IGF-I-induced receptor, and PKB and MAPK phosphorylation in the NWT-21 tumor xenograft^[1]. NVP-AEW541 is administered by oral gavage [50 mg/kg in 0.2 mL of 25 mM L-(+)-tartaric acid] twice a day for 14 consecutive days. The control group is similarly treated with 0.2 mL carrier [25 mM L-(+)-tartaric acid] twice a day. Tumor volume and animal weight are measured thrice a week till the end of the treatment. At that time, animals are sacrificed and tumors are collected and formalin fixed for histologic and immunohistochemical analyses. In both cases, NVP-AEW541 treatment causes tumor shrinkage that reached the statistical significance (P=0.0156 and P=0.0111 for HTLA-230 and SK-N-BE2c, respectively)^[2].