Abstract:
:Angiogenesis is a dynamic process relying on endothelial cell rearrangements within vascular tubes, yet the underlying mechanisms and functional relevance are poorly understood. Here we show that PI3Kα regulates endothelial cell rearrangements using a combination of a PI3Kα-selective inhibitor and endothelial-specific genetic deletion to abrogate PI3Kα activity during vessel development. Quantitative phosphoproteomics together with detailed cell biology analyses in vivo and in vitro reveal that PI3K signalling prevents NUAK1-dependent phosphorylation of the myosin phosphatase targeting-1 (MYPT1) protein, thereby allowing myosin light chain phosphatase (MLCP) activity and ultimately downregulating actomyosin contractility. Decreased PI3K activity enhances actomyosin contractility and impairs junctional remodelling and stabilization. This leads to overstretched endothelial cells that fail to anastomose properly and form aberrant superimposed layers within the vasculature. Our findings define the PI3K/NUAK1/MYPT1/MLCP axis as a critical pathway to regulate actomyosin contractility in endothelial cells, supporting vascular patterning and expansion through the control of cell rearrangement.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Angulo-Urarte A,Casado P,Castillo SD,Kobialka P,Kotini MP,Figueiredo AM,Castel P,Rajeeve V,Milà-Guasch M,Millan J,Wiesner C,Serra H,Muixi L,Casanovas O,Viñals F,Affolter M,Gerhardt H,Huveneers S,Belting HG,Cutillasdoi
10.1038/s41467-018-07172-3subject
Has Abstractpub_date
2018-11-16 00:00:00pages
4826issue
1issn
2041-1723pii
10.1038/s41467-018-07172-3journal_volume
9pub_type
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