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Wizenmann, A. ; Brunet, I.* ; Lam, J.S.Y.* ; Sonnier, L.* ; Beurdeley, M.* ; Zarbalis, K. ; Vogt Weisenhorn, D.M. ; Weinl, C.* ; Dwivedy, A.* ; Joliot, A.* ; Wurst, W. ; Holt, C.* ; Prochiantz, A.*

Extracellular engrailed participates in the topographic guidance of retinal axons in vivo.

Neuron 64, 355-366 (2009)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
Engrailed transcription factors regulate the expression of guidance cues that pattern retinal axon terminals in the dorsal midbrain. They also act directly to guide axon growth in vitro. We show here that an extracellular En gradient exists in the tectum along the anterior-posterior axis. Neutralizing extracellular Engrailed in vivo with antibodies expressed in the tectum causes temporal axons to map aberrantly to the posterior tectum in chick and Xenopus. Furthermore, posterior membranes from wild-type tecta incubated with anti-Engrailed antibodies or posterior membranes from Engrailed-1 knockout mice exhibit diminished repulsive activity for temporal axons. Since EphrinAs play a major role in anterior-posterior mapping, we tested whether Engrailed cooperates with EphrinA5 in vitro. We find that Engrailed restores full repulsion to axons given subthreshold doses of EphrinA5. Collectively, our results indicate that extracellular Engrailed contributes to retinotectal mapping in vivo by modulating the sensitivity of growth cones to EphrinA.
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Publication type Article: Journal article
Document type Scientific Article
Keywords ganglion-cell axons; visual-system; optic tectum; growth cone; ephrin-as; nasotemporal polarity; transcription factor; tyrosine kinases; map development; messenger-RNA
Language english
Publication Year 2009
HGF-reported in Year 2009
ISSN (print) / ISBN 0896-6273
e-ISSN 1097-4199
Journal Neuron
Quellenangaben Volume: 64, Issue: 3, Pages: 355-366 Article Number: , Supplement: ,
Publisher Cell Press
Publishing Place Cambridge, Mass.
Reviewing status Peer reviewed
Institute(s) Institute of Developmental Genetics (IDG)
POF-Topic(s) 30204 - Cell Programming and Repair
Research field(s) Genetics and Epidemiology
PSP Element(s) G-500500-001
PubMed ID 19914184
DOI 10.1016/j.neuron.2009.09.018
Scopus ID 70350772354
Erfassungsdatum 2009-12-31
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