In Vitro: AG 1295 inhibits PDGFR autophosphorylation with IC50s of 0.3-0.5 μM and 0.5-1 μM for membrane autophosphorylation assays and Swiss 3T3 cells, respectively. ?AG1295 (10 μM, 100 μM) significantly inhibits rabbit conjunctival fibroblast cell growth stimulated by PDGF-AA or PDGF-BB in vitro.
In Vivo: AG-1295 reduces neointimal formation in aortic allograft vasculopathy by inhibition of PDGFR-beta-triggered tyrosine phosphorylation. ?AG1295 (12 mg/kg; i.p.; daily; for 14 or 21 days) significantly reduces interstitial fibrosis as verified by a smaller Sirius-Red stained area and also by a reduced number of macrophages, and by the ED-A+ fibronectin deposition and the number of cells positive for alpha-smooth muscle actin.