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Insulin-like growth factor-binding protein-5 (IGFBP-5) is one of the six members of IGFBP family, important for cell growth control, induction of apoptosis and other IGF-stimulated signaling pathways. In this study, we focused on characterizing the specific function of IGFBP-5 as novel antiangiostatic factor. Overexpression of IGFBP-5 suppressed the tube formation as well as the biological functions of angiostatic activityin vivo. This result is due to the reduced expressions of phosphorylated protein kinase B and phosphorylated endothelial NO synthase, which plays important roles in the regulation of angiogenesis when stimulated by vascular endothelial growth factor. Further, IGFBP-5 expression prevented tumor growth and inhibited tumor vascularity in a xenograft model of human ovarian cancer. These results are the first evidence showing that IGFBP-5 plays a role as tumor suppressor by inhibiting angiogenesis.

Insulin-like growth factor-binding protein-5 (IGFBP-5) acts as a tumor suppressor by inhibiting angiogenesis