Integrin A4B1 Promotes Monocyte Trafficking and Angiogenesis in Tumors

Monocytes andmacrophages extensively colonize solid tumors, where they are thought to promote tumor angiogenesis. Here, we show that integrin A4B1 (VLA4) promotes the invasion of tumors by myeloid cells and subsequent neovascularization. Antagonists of integrinA4B1, but not of other integrins, blocked the adhesion of monocytes to endothelium in vitro and in vivo as well as their extravasation into tumor tissue. These antagonists prevented monocyte stimulation of angiogenesis in vivo , macrophage colonization of tumors, and tumor angiogenesis. These studies indicate the usefulness of antagonists of integrin A4B1 in suppressing macrophage colonization of tumors and subsequent tumor angiogenesis. These studies further indicate that suppression of myeloid cell homing to tumors could be a useful supplementary approach to suppress tumor angiogenesis and growth. (Cancer Res 2006; 66(4): 2146-52)