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Dendritic Spine Formation

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Science  19 Oct 2001:
Vol. 294, Issue 5542, pp. 481
DOI: 10.1126/science.294.5542.481c

Changes in the morphology of neuronal dendritic spines are correlated with changes in synaptic plasticity. The cell surface proteoglycan syndecan-2 is clustered at the surface of mature hippocampal neurons and is thought to regulate structural changes of the spines. Now Ethell et al. have demonstrated that syndecan-2 is phosphorylated on at least two tyrosine residues by the receptor-type tyrosine kinase EphB2 in vitro and in vivo. The two transmembrane proteins colocalized in dendrites of hippocampal neurons and were isolated in a complex from mouse brain neurons. Phosphorylation was required for their interaction, for syndecan-2 to cluster, and for normal dendritic spine formation in transfected neurons. Phosphorylation could trigger clustering of syndecan-2, and the EphB2-syndecan-2 complex may subsequently initiate the recruitment of downstream signaling molecules that control dendritic spine formation.—LC

Neuron31, 1001 (2001).

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