The orphan receptor Tie1 controls angiogenesis and vascular remodeling by differentially regulating Tie2 in tip and stalk cells
Tie1 is a mechanistically poorly characterized endothelial cell (EC)-specific orphan receptor. Yet, Tie1 deletion is embryonic lethal and Tie1 has been implicated in critical vascular pathologies, including atherosclerosis and tumor angiogenesis. Here, we show that Tie1 does not function independent...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
September 3, 2015
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| In: |
Cell reports
Year: 2015, Volume: 12, Issue: 11, Pages: 1761-1773 |
| ISSN: | 2211-1247 |
| DOI: | 10.1016/j.celrep.2015.08.024 |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1016/j.celrep.2015.08.024 Verlag, kostenfrei, Volltext: http://www.sciencedirect.com/science/article/pii/S2211124715008955 
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| Author Notes: | Soniya Savant, Silvia La Porta, Annika Budnik, Katrin Busch, Junhao Hu, Nathalie Tisch, Claudia Korn, Aida Freire Valls, Andrew V. Benest, Dorothee Terhardt, Xianghu Qu, Ralf H. Adams, H. Scott Baldwin, Carmen Ruiz de Almodóvar, Hans-Reimer Rodewald, and Hellmut G. Augustin |
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| 520 | |a Tie1 is a mechanistically poorly characterized endothelial cell (EC)-specific orphan receptor. Yet, Tie1 deletion is embryonic lethal and Tie1 has been implicated in critical vascular pathologies, including atherosclerosis and tumor angiogenesis. Here, we show that Tie1 does not function independently but exerts context-dependent effects on the related receptor Tie2. Tie1 was identified as an EC activation marker that is expressed during angiogenesis by a subset of angiogenic tip and remodeling stalk cells and downregulated in the adult quiescent vasculature. Functionally, Tie1 expression by angiogenic EC contributes to shaping the tip cell phenotype by negatively regulating Tie2 surface presentation. In contrast, Tie1 acts in remodeling stalk cells cooperatively to sustain Tie2 signaling. Collectively, our data support an interactive model of Tie1 and Tie2 function, in which dynamically regulated Tie1 versus Tie2 expression determines the net positive or negative effect of Tie1 on Tie2 signaling. | ||
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