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Title: VEGF-B-Neuropilin-1 signaling is spatiotemporally indispensable for vascular and neuronal development in zebrafish
Authors: Jensen, L. D.
Nakamura, M.
Bräutigam, L.
Li, X.
Liu, Y.
Samani, Nilesh Jayantilal
Cao, Yihai
First Published: 19-Oct-2015
Publisher: National Academy of Sciences
Citation: Proceedings of the National Academy of Sciences USA, 2015, 112 (44), pp. E5944-E5953
Abstract: Physiological functions of vascular endothelial growth factor (VEGF)-B remain an enigma, and deletion of the Vegfb gene in mice lacks an overt phenotype. Here we show that knockdown of Vegfba, but not Vegfbb, in zebrafish embryos by specific morpholinos produced a lethal phenotype owing to vascular and neuronal defects in the brain. Vegfba morpholinos also markedly prevented development of hyaloid vasculatures in the retina, but had little effects on peripheral vascular development. Consistent with phenotypic defects, Vegfba, but not Vegfaa, mRNA was primarily expressed in the brain of developing zebrafish embryos. Interestingly, in situ detection of Neuropilin1 (Nrp1) mRNA showed an overlapping expression pattern with Vegfba, and knockdown of Nrp1 produced a nearly identically lethal phenotype as Vegfba knockdown. Furthermore, zebrafish VEGF-Ba protein directly bound to NRP1. Importantly, gain-of-function by exogenous delivery of mRNAs coding for NRP1-binding ligands VEGF-B or VEGF-A to the zebrafish embryos rescued the lethal phenotype by normalizing vascular development. Similarly, exposure of zebrafish embryos to hypoxia also rescued the Vegfba morpholino-induced vascular defects in the brain by increasing VEGF-A expression. Independent evidence of VEGF-A gain-of-function was provided by using a functionally defective Vhl-mutant zebrafish strain, which again rescued the Vegfba morpholino-induced vascular defects. These findings show that VEGF-B is spatiotemporally required for vascular development in zebrafish embryos and that NRP1, but not VEGFR1, mediates the essential signaling.
DOI Link: 10.1073/pnas.1510245112
eISSN: 1091-6490
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015, the authors. Exclusive Licensee: PNAS. Deposited with reference to the publisher’s author license.
Appears in Collections:Published Articles, Dept. of Cardiovascular Sciences

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