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Neuropilin-1 regulates a new VEGF-induced gene, Phactr-1, which controls tubulogenesis and modulates lamellipodial dynamics in human endothelial cells

  • Barbara Allain
  • , Rafika Jarray
  • , Lucia Borriello
  • , Bertrand Leforban
  • , Sylvie Dufour
  • , Wang Qing Liu
  • , Perayot Pamonsinlapatham
  • , Sara Bianco
  • , Jérôme Larghero
  • , Reda Hadj-Slimane
  • , Christiane Garbay
  • , Franҫoise Raynaud
  • , Yves Lepelletier
  • Université Paris Cité
  • Tragex Pharma
  • Institut Curie
  • Silpakorn University
  • Institut national de la santé et de la recherche médicale
  • Université Paris Descartes
  • Division of Prions and Related Diseases (SEPIA)
  • SupBiotech Engineering School of Biotechnology
  • Commissariat à l’énergie atomique et aux énergies alternatives
  • Unité 955
  • University-Sorbonne Paris Cité
  • CNRS
  • Paris Descartes University-Sorbonne Paris Cité, Imagine Institute

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Recently, we identified a new Vascular Endothelial Growth Factor (VEGF)-A 165-induced gene Phactr-1, (Phosphatase Actin Regulator-1). We reported that Phactr-1 gene silencing inhibited tube formation in human umbilical endothelial cells (HUVECs) indicating a key role for Phactr-1 in tubulogenesis in vitro. In this study, we investigated the role of Phactr-1 in several cellular processes related to angiogenesis. We found that neuropilin-1 (NRP-1) and VEGF-R1 depletion inhibited Phactr-1 mRNA expression while NRP-2 and VEGF-R2 depletion had no effect. We described a new interaction site of VEGF-A 165 to VEGF-R1 in peptides encoded by exons 7 and 8 of VEGF-A 165. The specific inhibition of VEGF-A 165 binding on NRP-1 and VEGF-R1 by ERTCRC and CDKPRR peptides decreased the Phactr-1 mRNA levels in HUVECs indicating that VEGF-A 165-dependent regulation of Phactr-1 expression required both NRP-1 and VEGF-R1 receptors. In addition, upon VEGFA 165-stimulation Phactr-1 promotes formation and maintenance of cellular tubes through NRP-1 and VEGFR1. Phactr-1 was previously identified as protein phosphatase 1 (PP1) α-interacting protein that possesses actin-binding domains. We showed that Phactr-1 depletion decreased PP1 activity, disrupted the fine-tuning of actin polymerization and impaired lamellipodial dynamics. Taken together our results strongly suggest that Phactr-1 is a key component in the angiogenic process.

Original languageEnglish
Pages (from-to)214-223
Number of pages10
JournalCellular Signalling
Volume24
Issue number1
DOIs
StatePublished - Jan 2012

Keywords

  • Amino Acid Sequence
  • Binding, Competitive
  • Cell Culture Techniques
  • Cell Movement
  • Cells, Cultured
  • Endothelial Cells/metabolism
  • Gene Knockdown Techniques
  • Human Umbilical Vein Endothelial Cells/metabolism
  • Humans
  • Microfilament Proteins/genetics
  • Microtubules/metabolism
  • Neovascularization, Pathologic/metabolism
  • Neuropilin-1/genetics
  • Peptide Fragments/chemistry
  • Protein Binding
  • Pseudopodia/metabolism
  • RNA Interference
  • Time-Lapse Imaging
  • Transcription, Genetic
  • Vascular Endothelial Growth Factor A/chemistry
  • Vascular Endothelial Growth Factor Receptor-1/chemistry

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