AG 1295 is a selective platelet-derived growth factor receptor (PDGFR) tyrosine-kinase inhibitor. AG1295 abolishes autophosphorylation of the PDGFR. But it can not affects the autophosphorylation of the EGF receptor.
AG1295 (10 μM, 100 μM) significantly inhibits rabbit conjunctival fibroblast cell growth stimulated by PDGF-AA or PDGF-BB 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.
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 by a reduced number of macrophages, and by the ED-A+ fibronectin deposition. It is also verified by the number of cells positive for alpha-smooth muscle actin.