Interaction between insulin-like growth factor 1 (IGFI) and integrin is involved in integrin-mediated cellular signaling, such as enhanced proliferation of cells expressing integrins, especially integrin alpha v beta 3, alpha 6 beta. 1 and alpha 6. beta. 4. A method for inhibiting integrin signaling by using an inhibitor of IGFI-integrin binding is disclosed A method for identifying inhibitors of IGFI-integrin binding is also described. Further disclosed are polypeptides, nucleic acids, and corresponding compositions for inhibiting integrin signaling.
