Abstract
Vascular endothelial growth factor (VEGF) and its receptors (VEGFR) have been implicated in promoting solid tumor growth and metastasis via stimulating tumor-associated angiogenesis. Here we show that certain "liquid" tumors such as acute myeloid leukemia not only produce VEGF but also express functional VEGFR, resulting in an autocrine loop for tumor growth and propagation. In addition, the leukemia-derived VEGF can also stimulate the production of growth factors, including interleukin 6 (IL6) and granulocyte-macrophage colony stimulating factor (GM-CSF), by human endothelial cells, which in turn further promotes the growth of leukemia cells (the paracrine loop). A fully human anti-VEGFR2 (or kinase insert domain-containing receptor, KDR) antibody, IMC-2C6, strongly blocks KDR/VEGF interaction and neutralizes VEGF-stimulated activation of KDR in endothelial cells. In a system where leukemia cells are co-cultured with endothelial cells, IMC-2C6 inhibits both the production of IL6 and GM-CSF by endothelial cells and the growth of leukemia cells. Finally, IMC-2C6 effectively blocks VEGF-induced migration of KDR+ human leukemia cells, and when administered in vivo, significantly prolonged survival of mice inoculated with KDR+ huma...Continue Reading
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