TGF-β RI Kinase Inhibitor V is a selective and reversible inhibitor, which suppresses TGF-β RI/ALK5 signaling. It is known that TGF-β RI Kinase Inhibitor V also inhibits p38α at concentrations greater than 867 nM. Studies indicate that TGF-βRI Kinase Inhibitor V reduces the number of myofibroblasts at fibroblastic foci. In addition, this compound is effective in blocking autocrine and paracrine TGF-β signaling in glioma cells and restores the lytic activity of polyclonal natural killer cells against glioma cells. This inhibitor functions in suppressing the action of MAPKAP and PKD.