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ZFIN ID: ZDB-PUB-150128-8
Regulation of β1 Integrin-Klf2-Mediated Angiogenesis by CCM Proteins
Renz, M., Otten, C., Faurobert, E., Rudolph, F., Zhu, Y., Boulday, G., Duchene, J., Mickoleit, M., Dietrich, A.C., Ramspacher, C., Steed, E., Manet-Dupé, S., Benz, A., Hassel, D., Vermot, J., Huisken, J., Tournier-Lasserve, E., Felbor, U., Sure, U., Albiges-Rizo, C., Abdelilah-Seyfried, S.
Date: 2015
Source: Developmental Cell 32: 181-190 (Journal)
Registered Authors: Abdelilah-Seyfried, Salim, Hassel, David, Huisken, Jan, Mickoleit, Michaela, Vermot, Julien
Keywords: none
MeSH Terms:
  • Animals
  • Cell Adhesion/physiology
  • Cell Movement/genetics
  • Cell Movement/physiology*
  • Central Nervous System Neoplasms/metabolism
  • Hemangioma, Cavernous, Central Nervous System/genetics
  • Hemangioma, Cavernous, Central Nervous System/metabolism*
  • Human Umbilical Vein Endothelial Cells/cytology
  • Human Umbilical Vein Endothelial Cells/metabolism
  • Integrin beta1/metabolism*
  • Kruppel-Like Transcription Factors/metabolism*
  • Mechanotransduction, Cellular/physiology
  • Membrane Proteins/metabolism
  • Mice
  • Neovascularization, Pathologic/metabolism*
  • Nerve Tissue Proteins/metabolism
  • Proteins/metabolism*
  • RNA, Small Interfering/genetics
  • Signal Transduction/physiology
  • Zebrafish
  • Zebrafish Proteins/metabolism*
PubMed: 25625207 Full text @ Dev. Cell
FIGURES
ABSTRACT
Mechanotransduction pathways are activated in response to biophysical stimuli during the development or homeostasis of organs and tissues. In zebrafish, the blood-flow-sensitive transcription factor Klf2a promotes VEGF-dependent angiogenesis. However, the means by which the Klf2a mechanotransduction pathway is regulated to prevent continuous angiogenesis remain unknown. Here we report that the upregulation of klf2 mRNA causes enhanced egfl7 expression and angiogenesis signaling, which underlies cardiovascular defects associated with the loss of cerebral cavernous malformation (CCM) proteins in the zebrafish embryo. Using CCM-protein-depleted human umbilical vein endothelial cells, we show that the misexpression of KLF2 mRNA requires the extracellular matrix-binding receptor β1 integrin and occurs in the absence of blood flow. Downregulation of β1 integrin rescues ccm mutant cardiovascular malformations in zebrafish. Our work reveals a β1 integrin-Klf2-Egfl7-signaling pathway that is tightly regulated by CCM proteins. This regulation prevents angiogenic overgrowth and ensures the quiescence of endothelial cells.
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