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Pericyte deficiencies lead to aberrant tumor vascularizaton in the brain of the NG2 null mouse.

Abstract
Tightly regulated crosstalk between endothelial cells and pericytes is required for formation and maintenance of functional blood vessels. When the NG2 proteoglycan is absent from pericyte surfaces, vascularization of syngeneic tumors growing in the C57Bl/6 mouse brain is aberrant in several respects, resulting in retardation of tumor progression. In the NG2 null mouse brain, pericyte investment of the tumor vascular endothelium is reduced, causing deficiencies in both pericyte and endothelial cell maturation, as well as reduced basal lamina assembly. While part of this deficit may be due to the previously-identified role of NG2 in beta1 integrin-dependent periyte/endothelial cell crosstalk, the ablation of NG2 also appears responsible for loss of collagen VI anchorage, in turn leading to reduced collagen IV deposition. Poor functionality of tumor vessels in NG2 null brain is reflected by reduced vessel patency and increased vessel leakiness, resulting in large increases in tumor hypoxia. These findings demonstrate the importance of NG2-dependent pericyte/endothelial cell interaction in the development and maturation of tumor blood vessels, identifying NG2 as a potential target for anti-angiogenic cancer therapy.
AuthorsFeng-Ju Huang, Weon-Kyoo You, Paolo Bonaldo, Thomas N Seyfried, Elena B Pasquale, William B Stallcup
JournalDevelopmental biology (Dev Biol) Vol. 344 Issue 2 Pg. 1035-46 (Aug 15 2010) ISSN: 1095-564X [Electronic] United States
PMID20599895 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
CopyrightCopyright 2010 Elsevier Inc. All rights reserved.
Chemical References
  • Antigens
  • Proteoglycans
  • chondroitin sulfate proteoglycan 4
Topics
  • Animals
  • Antigens
  • Basement Membrane (pathology, physiopathology)
  • Blood Vessels (growth & development, pathology, physiopathology)
  • Brain (pathology, physiopathology)
  • Cell Communication
  • Cell Differentiation
  • Endothelial Cells (pathology)
  • Endothelium, Vascular (pathology, physiopathology)
  • Extracellular Matrix (pathology)
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Neovascularization, Pathologic (pathology, physiopathology)
  • Pericytes (pathology)
  • Proteoglycans

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