Angiogenesis.

The formation of new blood vessels, angiogenesis, is a complex process which is central to normal development and homeostasis. However, uncontrolled angiogenesis plays a critical role in both inflammatory and neoplastic disorders. Our understanding of angiogenesis has expanded greatly over the past two decades due to the development of in vivo and in vitro models to study this important process. A variety of cytokines and growth factors have been shown to induce new blood vessel formation in vivo, and in vitro studies have been able to define whether agents have direct or indirect effects upon vascular endothelial cells. Our improved understanding of the mechanisms which regulate angiogenesis has now created important opportunities for the development of new therapies for the treatment of inflammatory and neoplastic skin disease.