Blood flow suppresses vascular Notch signalling via dll4 and is required for angiogenesis in response to hypoxic signalling

Oliver Watson, Peter Novodvorsky, Caroline Gray, Alexander M. K. Rothman, Allan Lawrie, David C. Crossman, Andrea Haase, Kathryn McMahon, Martin Gering, Fredericus J. M. Van Eeden, Timothy J. A. Chico*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)
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Abstract

The contribution of blood flow to angiogenesis is incompletely understood. We examined the effect of blood flow on Notch signalling in the vasculature of zebrafish embryos, and whether blood flow regulates angiogenesis in zebrafish with constitutively up-regulated hypoxic signalling.

Developing zebrafish (Danio rerio) embryos survive via diffusion in the absence of circulation induced by knockdown of cardiac troponin T2 or chemical cardiac cessation. The absence of blood flow increased vascular Notch signalling in 48 h post-fertilization old embryos via up-regulation of the Notch ligand dll4. Despite this, patterning of the intersegmental vessels is not affected by absent blood flow. We therefore examined homozygous vhl mutant zebrafish that have constitutively up-regulated hypoxic signalling. These display excessive and aberrant angiogenesis from 72 h post-fertilization, with significantly increased endothelial number, vessel diameter, and length. The absence of blood flow abolished these effects, though normal vessel patterning was preserved.

We show that blood flow suppresses vascular Notch signalling via down-regulation of dll4. We have also shown that blood flow is required for angiogenesis in response to hypoxic signalling but is not required for normal vessel patterning. These data indicate important differences in hypoxia-driven vs. developmental angiogenesis.

Original languageEnglish
Pages (from-to)252-261
Number of pages10
JournalCardiovascular Research
Volume100
Issue number2
Early online date28 Jun 2013
DOIs
Publication statusPublished - 1 Nov 2013

Keywords

  • Zebrafish
  • Angiogenesis
  • Blood flow
  • Notch
  • Angio-/arteriogenesis

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