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Integrin alpha4beta1 promotes monocyte trafficking and angiogenesis in tumors.

Abstract
Monocytes and macrophages extensively colonize solid tumors, where they are thought to promote tumor angiogenesis. Here, we show that integrin alpha4beta1 (VLA4) promotes the invasion of tumors by myeloid cells and subsequent neovascularization. Antagonists of integrin alpha4beta1, 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 alpha4beta1 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.
AuthorsHui Jin, Jingmei Su, Barbara Garmy-Susini, Jeanine Kleeman, Judy Varner
JournalCancer research (Cancer Res) Vol. 66 Issue 4 Pg. 2146-52 (Feb 15 2006) ISSN: 0008-5472 [Print] United States
PMID16489015 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References
  • Integrin alpha4beta1
Topics
  • Animals
  • Carcinoma, Lewis Lung (blood supply, pathology)
  • Cell Adhesion (physiology)
  • Colonic Neoplasms (blood supply, pathology)
  • Endothelial Cells (pathology)
  • HT29 Cells
  • Humans
  • Integrin alpha4beta1 (physiology)
  • Leukocytes, Mononuclear (cytology, physiology)
  • Lymphangiogenesis
  • Macrophages (cytology, physiology)
  • Mice
  • Mice, Nude
  • Myeloid Cells (pathology)
  • Neovascularization, Pathologic (pathology)

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