PF-8380 inhibits rat autotaxin with an IC50 of 1.16 nM with FS-3 substrate. In human whole blood incubated with compound for 2 h autotaxin was inhibited with an IC50 of 101 nM.Inhibition of autotaxin by PF-8380 leads to decreased invasion, migtation and enhanced radiosensitization of GBM cells. Radiation-induced activation of Akt is abrogated by inhibition of ATX. Furthermore, inhibition of ATX leads to diminished tumor vascularity and delayed tumor growth.
In vivo
Pre-treatment with PF-8380 prior to irradiation inhibited radiation-induced angiogenesis of tumor vascular endothelial cells and delayed progression of glioma tumor growth in vivo. Oral administration of 30 mg/kg PF8380 reduces inflammatory hyperalgesia in a rat air pouch model, exhibiting >95% reduction of LPA levels in both plasma and inflammatory site tissue within 3 hours.