Notch Pathway Targets Proangiogenic Regulator Sox17 to Restrict Angiogenesis

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Rationale: The Notch pathway stabilizes sprouting angiogenesis by favoring stalk cells over tip cells at the vascular front. Because tip and stalk cells have different properties in morphology and function, their transcriptional regulation remains to be distinguished. Transcription factor Sox17 is specifically expressed in endothelial cells, but its expression and role at the vascular front remain largely unknown. Objective: To specify the role of Sox17 and its relationship with the Notch pathway in sprouting angiogenesis. Methods and Results: Endothelial-specific Sox17 deletion reduces sprouting angiogenesis in mouse embryonic and postnatal vascular development, whereas Sox17 overexpression increases it. Sox17 promotes endothelial migration by destabilizing endothelial junctions and rearranging cytoskeletal structure and upregulates expression of several genes preferentially expressed in tip cells. Interestingly, Sox17 expression is suppressed in stalk cells in which Notch signaling is relatively high. Notch activation by overexpressing Notch intracellular domain reduces Sox17 expression both in primary endothelial cells and in retinal angiogenesis, whereas Notch inhibition by delta-like ligand 4 (D114) blockade increases it. The Notch pathway regulates Sox17 expression mainly at the post-transcriptional level. Furthermore, endothelial Sox17 ablation rescues vascular network from excessive tip cell formation and hyperbranching under Notch inhibition in developmental and tumor angiogenesis. Conclusions: Our findings demonstrate that the Notch pathway restricts sprouting angiogenesis by reducing the expression of proangiogenic regulator Sox17.
Publisher
LIPPINCOTT WILLIAMS & WILKINS
Issue Date
2014-07
Language
English
Article Type
Article
Citation

CIRCULATION RESEARCH, v.115, no.2, pp.215 - 226

ISSN
0009-7330
DOI
10.1161/CIRCRESAHA.115.303142
URI
http://hdl.handle.net/10203/190057
Appears in Collection
BS-Journal Papers(저널논문)MSE-Journal Papers(저널논문)
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