ZFIN ID: ZDB-PUB-130709-68
In Vivo analysis reveals a highly stereotypic morphogenetic pathway of vascular anastomosis
Lenard, A., Ellertsdottir, E., Herwig, L., Krudewig, A., Sauteur, L., Belting, H.G., and Affolter, M.
Date: 2013
Source: Developmental Cell   25(5): 492-506 (Journal)
Registered Authors: Affolter, Markus, Belting, Heinz-Georg Paul (Henry), Ellertsdottir, Elin
Keywords: none
MeSH Terms:
  • Animals
  • Animals, Genetically Modified
  • Antigens, CD/metabolism
  • Body Patterning
  • Brain/blood supply
  • Brain/embryology
  • Cadherins/metabolism
  • Cerebrovascular Circulation
  • Endothelium, Vascular/embryology
  • Endothelium, Vascular/pathology*
  • Gene Expression Regulation, Developmental*
  • Microscopy, Fluorescence/methods
  • Morphogenesis
  • Mutation
  • Neovascularization, Physiologic*
  • Pseudopodia/physiology*
  • Zebrafish/embryology
PubMed: 23763948 Full text @ Dev. Cell

Organ formation and growth requires cells to organize into properly patterned three-dimensional architectures. Network formation within the vertebrate vascular system is driven by fusion events between nascent sprouts or between sprouts and pre-existing blood vessels. Here, we describe the cellular activities that occur during blood vessel anastomosis in the cranial vasculature of the zebrafish embryo. We show that the early steps of the fusion process involve endothelial cell recognition, de novo polarization of endothelial cells, and apical membrane invagination and fusion. These processes generate a unicellular tube, which is then transformed into a multicellular tube via cell rearrangements and cell splitting. This stereotypic series of morphogenetic events is typical for anastomosis in perfused sprouts. Vascular endothelial-cadherin plays an important role early in the anastomosis process and is required for filopodial tip cell interactions and efficient formation of a single contact site.