Loss of Notch Signalling Induced by Dll4 Causes Arterial Calibre Reduction by Increasing Endothelial Cell Response to Angiogenic Stimuli

Overview

Journal BMC Dev Biol

Publisher Biomed Central

Specialties Biology
Reproductive Medicine

Date 2008 Dec 18

PMID 19087347

Citations 36

Authors

Rui Benedito

Alexandre Trindade

Masanori Hirashima

Domingos Henrique

Luis Lopes da Costa

Janet Rossant

Parkash S Gill

Antonio Duarte

Affiliations

Soon will be listed here.

Abstract

Background: In the vascular system, Notch receptors and ligands are expressed mainly on arteries, with Delta-like 4 (Dll4) being the only ligand known to be expressed early during the development of arterial endothelial cells and capillaries. Dll4 null embryos die very early in development with severely reduced arterial calibre and lumen and loss of arterial cell identity.

Results: The current detailed analysis of these mutants shows that the arterial defect precedes the initiation of blood flow and that the arterial Dll4-/- endothelial cells proliferate and migrate more actively. Dll4-/- mutants reveal a defective basement membrane around the forming aorta and increased endothelial cell migration from the dorsal aorta to peripheral regions, which constitute the main causes of arterial lumen reduction in these embryos. The increased proliferation and migration of Dll4-/- endothelial cells was found to coincide with increased expression of the receptors VEGFR-2 and Robo4 and with downregulation of the TGF-beta accessory receptor Endoglin.

Conclusion: Together, these results strongly suggest that Notch signalling can increase arterial stability and calibre by decreasing the response of arterial endothelial cells to local gradients of pro-angiogenic factors like VEGF.

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