Cell experiment:

Exponentially growing TF-1 cells are treated with various concentrations of AZ-23 and then incubated for an additional 72 h at 37℃ in either growth or basal medium plus 100 ng/mL NGF. Cell proliferation is measured using MTS solution[1].

Animal experiment:

Mice[1] Tumor-bearing mice are given a single, oral dose of compound and individual mice are sacrificed at various time points postdose (2, 6, 16, or 24 hours). Tumors are excised and homogenized and the resulting tumor lysates are analyzed using an ELISA for pTrkA[1].

AZ-23 is an ATP-competitive and orally bioavailable Trk kinase A/B/C inhibitor with IC50s of 2 nM (TrkA), 8 nM (TrkB), 24 nM (FGFR1), 52 nM (Flt3), 55 nM (Ret), 84 nM (MuSk), 99 nM (Lck), respectively.

AZ-23 potently and selectivity inhibits Trk phosphorylation in cells. AZ-23 potently inhibits Trk-mediated survival (EC50 of 2 nM). AZ-23 Inhibits Trk-Dependent Survival in MCF10ATrkA-δ and TF-1 Cell Lines[1].

AZ-23 shows in vivo TrkA kinase inhibition and efficacy in mice following oral administration in a TrkA-driven allograft model and significant tumor growth inhibition in a Trk-expressing xenograft model of neuroblastoma[1].

[1]. Thress K, et al. Identification and preclinical characterization of AZ-23, a novel, selective, and orally bioavailable inhibitor of the Trk kinase pathway. Mol Cancer Ther. 2009 Jul; 8(7):1818-27.