Echistatin is a naturally derived RGD-containing snake venom peptide. Echistatin exhibits an IC50 of 0.6 nM against mouse αvβ3 integrin, and acts as an antagonist against αvβ3, αIIbβ3, α5β1 integrins, pp125 FAK and paxillin. Echistatin reduces the phosphorylation of pp125 FAK and paxillin, inhibits the autophosphorylation and kinase activity of pp125 FAK, and weakens its binding to pp60src and paxillin. Echistatin disrupts the actin cytoskeleton and focal adhesions, induces melanoma cell detachment from fibronectin, and regulates cell adhesion and motility. Echistatin inhibits osteoclast maturation and migration, bone resorption, platelet aggregation, bone loss, as well as adhesion and metastasis of Lewis lung cancer cells; it also increases the number of osteoclasts and bone coverage area in mice with secondary hyperparathyroidism. Echistatin can be used in research related to melanoma, lung cancer and secondary hyperparathyroidism .