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Title: Endothelial cell rearrangements during vascular patterning require PI3-kinase-mediated inhibition of actomyosin contractility
Author: Angulo Urarte, Ana
Casado, Pedro
Castillo, Sandra D.
Kobialka, Piotr
Kotini, Maria Paraskevi
Figueiredo, Ana Raquel Martins
Castel Morales, Pau
Rajeeve, Vinothini
Milà Guasch, Maria
Millán, Jaime
Wiesner, Cora
Serra, Helena
Muixi, Laura
Casanovas i Casanovas, Oriol
Viñals Canals, Francesc
Affolter, Markus
Gerhardt, Holger
Huveneers, Stephan
Belting, Heinz-Georg
Cutillas, Pedro R.
Graupera i Garcia-Milà, Mariona
Keywords: Proteïnes quinases
Regulació genètica
Expressió gènica
Protein kinases
Genetic regulation
Gene expression
Issue Date: 16-Nov-2018
Publisher: Nature Publishing Group
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.
Note: Reproducció del document publicat a:
It is part of: Nature Communications, 2018, vol. 9, num. 1, p. 4826
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ISSN: 2041-1723
Appears in Collections:Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))
Articles publicats en revistes (Ciències Fisiològiques)

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