Insulin-like growth factor-I modulates endothelial cell chemotaxis.

Insulin-like growth factor-I (IGF-I) significantly promoted chemotaxis in three separate endothelial cell lines at concentrations ranging from 4 to 150 ng/ml. When added to minimum essential medium (MEM) supplemented with 1% fetal calf serum, IGF-I augmented chemotaxis to a level equalling the maximal chemotactic effect obtainable with MEM supplemented with 10% fetal calf serum (FCS 10%). The data are compatible with a potential role for IGF-I in neovascularization.