Grb4 and GIT1 transduce ephrinB reverse signals modulating spine morphogenesis and synapse formation View Full Text


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Article Info

DATE

2007-03

AUTHORS

Inmaculada Segura, Clara L Essmann, Stefan Weinges, Amparo Acker-Palmer

ABSTRACT

Dendritic spines are small protrusions emerging from dendrites that receive excitatory input. The process of spine morphogenesis occurs both in the developing brain and during synaptic plasticity. Molecules regulating the cytoskeleton are involved in spine formation and maintenance. Here we show that reverse signaling by the transmembrane ligands for Eph receptors, ephrinBs, is required for correct spine morphogenesis. The molecular mechanism underlying this function of ephrinBs involves the SH2 and SH3 domain-containing adaptor protein Grb4 and the G protein-coupled receptor kinase-interacting protein (GIT) 1. Grb4 binds by its SH2 domain to Tyr392 in the synaptic localization domain of GIT1. Phosphorylation of Tyr392 and the recruitment of GIT1 to synapses are regulated by ephrinB activation. Disruption of this pathway in cultured rat hippocampal neurons impairs spine morphogenesis and synapse formation. We thus show an important role for ephrinB reverse signaling in spine formation and have mapped the downstream pathway involved in this process. More... »

PAGES

301-310

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nn1858

DOI

http://dx.doi.org/10.1038/nn1858

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1042268473

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17310244


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59 schema:description Dendritic spines are small protrusions emerging from dendrites that receive excitatory input. The process of spine morphogenesis occurs both in the developing brain and during synaptic plasticity. Molecules regulating the cytoskeleton are involved in spine formation and maintenance. Here we show that reverse signaling by the transmembrane ligands for Eph receptors, ephrinBs, is required for correct spine morphogenesis. The molecular mechanism underlying this function of ephrinBs involves the SH2 and SH3 domain-containing adaptor protein Grb4 and the G protein-coupled receptor kinase-interacting protein (GIT) 1. Grb4 binds by its SH2 domain to Tyr392 in the synaptic localization domain of GIT1. Phosphorylation of Tyr392 and the recruitment of GIT1 to synapses are regulated by ephrinB activation. Disruption of this pathway in cultured rat hippocampal neurons impairs spine morphogenesis and synapse formation. We thus show an important role for ephrinB reverse signaling in spine formation and have mapped the downstream pathway involved in this process.
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