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Both processes are controlled by Wnt or Norrin (NDP) ligands, Frizzled (FZD) receptors, and \u03b2-catenin-dependent signalling in vascular endothelial cells. In the retina, FZD4 and the ligand NDP are critical mediators of signalling and are mutated in familial exudative vitreoretinopathy. Here, we report that NDP is a potent trigger of FZD4 ubiquitination and induces internalization of the NDP receptor complex into the endo-lysosomal compartment. Inhibition of ubiquitinated cargo transport through the multivesicular body (MVB) pathway using a dominant negative ESCRT (endosomal sorting complexes required for transport) component VPS4 EQ strongly impairs NDP\/FZD4 signalling <jats:italic>in vitro<\/jats:italic> and recapitulates CNS angiogenesis and blood-CNS-barrier defects caused by impaired vascular \u03b2-catenin signalling in mice. These findings provide evidence for an important role of FZD4 endocytosis in NDP\/FZD4 signalling and in CNS vascular biology and disease.<\/jats:p>","DOI":"10.1038\/ncomms16050","type":"journal-article","created":{"date-parts":[[2017,7,4]],"date-time":"2017-07-04T09:32:56Z","timestamp":1499160776000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":49,"title":["Norrin-induced Frizzled4 endocytosis and endo-lysosomal trafficking control retinal angiogenesis and barrier function"],"prefix":"10.1038","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2693-6643","authenticated-orcid":false,"given":"Chi","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria B.","family":"Lai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lavan","family":"Khandan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lindsey A.","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhe","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2458-6010","authenticated-orcid":false,"given":"Harald J.","family":"Junge","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,7,4]]},"reference":[{"key":"BFncomms16050_CR1","doi-asserted-by":"publisher","first-page":"1192","DOI":"10.1016\/j.cell.2012.05.012","volume":"149","author":"H Clevers","year":"2012","unstructured":"Clevers, H. & Nusse, R. 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