Loss of Notch signalling induced by Dll4 causes arterial calibre reduction by increasing endothelial cell response to angiogenic stimuli

被引：52

作者：

Benedito, Rui ^{[1
,2
,7
]}

Trindade, Alexandre ^{[1
,2
]}

Hirashima, Masanori ^{[3
]}

Henrique, Domingos ^{[4
]}

da Costa, Luis Lopes ^{[1
]}

Rossant, Janet ^{[5
]}

Gill, Parkash S. ^{[6
]}

Duarte, Antonio ^{[1
,2
]}

机构：

[1] Univ Tecn Lisboa, Fac Med Vet, Ctr Interdisciplinar Invest Sanidade Anim, Lisbon, Portugal

[2] Inst Gulbenkian Ciencias, Oeiras, Portugal

[3] Keio Univ, Sch Med, Sakaguchi Lab Dev Biol, Tokyo, Japan

[4] Univ Lisbon, Fac Med, Inst Mol Med, P-1699 Lisbon, Portugal

[5] Univ So Calif, Keck Sch Med, Dept Pathol, Los Angeles, CA 90033 USA

[6] Hosp Sick Children, Program Dev Biol, Toronto, ON M5G 1X8, Canada

[7] Max Planck Inst Mol Biomed, Munster, Germany

来源：

BMC DEVELOPMENTAL BIOLOGY | 2008年 / 8卷

关键词：

D O I：

10.1186/1471-213X-8-117

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 proangiogenic factors like VEGF.

引用

页数：15

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