Angiopoietin receptor Tie2 is required for vein specification and maintenance via regulating COUP-TFII

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Mechanisms underlying the vein development remain largely unknown. Tie2 signaling mediates endothelial cell (EC) survival and vascular maturation and its activating mutations are linked to venous malformations. Here we show that vein formation are disrupted in mouse skin and mesentery when Tie2 signals are diminished by targeted deletion of Tek either ubiquitously or specifically in embryonic ECs. Postnatal Tie2 attenuation resulted in the degeneration of newly formed veins followed by the formation of haemangioma-like vascular tufts in retina and venous tortuosity. Mechanistically, Tie2 insufficiency compromised venous EC identity, as indicated by a significant decrease of COUP-TFII protein level, a key regulator in venogenesis. Consistently, angiopoietin-1 stimulation increased COUP-TFII in cultured ECs, while Tie2 knockdown or blockade of Tie2 downstream PI3K/Akt pathway reduced COUP-TFII which could be reverted by the proteasome inhibition. Together, our results imply that Tie2 is essential for venous specification and maintenance via Akt mediated stabilization of COUP-TFII.
Publisher
ELIFE SCIENCES PUBLICATIONS LTD
Issue Date
2017-01
Language
English
Article Type
Article
Keywords

ARTERIAL SPECIFICATION; VENOUS DIFFERENTIATION; VASCULAR DEVELOPMENT; TYROSINE KINASE; TIP CELLS; MOUSE; ANGIOGENESIS; PATHWAY; MORPHOGENESIS; ACTIVATION

Citation

ELIFE, v.6

ISSN
2050-084X
DOI
10.7554/eLife.21032
URI
http://hdl.handle.net/10203/220891
Appears in Collection
MSE-Journal Papers(저널논문)
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