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Title: PP2A regulatory subunit Bα controls endothelial contractility and vessel lumen integrity via regulation of HDAC7
Authors: Martin, Maud *
Geudens, Ilse *
Bruyr, Jonathan
Potente, Michael
Bleuart, Anouk
Lebrun, Marielle
Simonis, Nicolas
Deroanne, Christophe
Twizere, Jean-Claude
Soubeyran, Philippe
Peixoto, Paul
Mottet, Denis
Janssens, Veerle
Hofmann, Wolf-Karsten
Claes, Filip
Carmeliet, Peter
Kettmann, Richard
Gerhardt, Holger #
Dequiedt, Franck # ×
Issue Date: Sep-2013
Publisher: Nature Publishing Group
Series Title: EMBO Journal vol:32 issue:18 pages:2491-2503
Abstract: To supply tissues with nutrients and oxygen, the cardiovascular system forms a seamless, hierarchically branched, network of lumenized tubes. Here, we show that maintenance of patent vessel lumens requires the Bα regulatory subunit of protein phosphatase 2A (PP2A). Deficiency of Bα in zebrafish precludes vascular lumen stabilization resulting in perfusion defects. Similarly, inactivation of PP2A-Bα in cultured ECs induces tubulogenesis failure due to alteration of cytoskeleton dynamics, actomyosin contractility and maturation of cell-extracellular matrix (ECM) contacts. Mechanistically, we show that PP2A-Bα controls the activity of HDAC7, an essential transcriptional regulator of vascular stability. In the absence of PP2A-Bα, transcriptional repression by HDAC7 is abrogated leading to enhanced expression of the cytoskeleton adaptor protein ArgBP2. ArgBP2 hyperactivates RhoA causing inadequate rearrangements of the EC actomyosin cytoskeleton. This study unravels the first specific role for a PP2A holoenzyme in development: the PP2A-Bα/HDAC7/ArgBP2 axis maintains vascular lumens by balancing endothelial cytoskeletal dynamics and cell-matrix adhesion.
URI: 
ISSN: 0261-4189
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Protein Phosphorylation and Proteomics
Switch Laboratory
* (joint) first author
× corresponding author
# (joint) last author

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