Induction of spine growth and synapse formation by regulation of the spine actin cytoskeleton.

Abstract:

:We explored the relationship between regulation of the spine actin cytoskeleton, spine morphogenesis, and synapse formation by manipulating expression of the actin binding protein NrbI and its deletion mutants. In pyramidal neurons of cultured rat hippocampal slices, NrbI is concentrated in dendritic spines by binding to the actin cytoskeleton. Expression of one NrbI deletion mutant, containing the actin binding domain, dramatically increased the density and length of dendritic spines with synapses. This hyperspinogenesis was accompanied by enhanced actin polymerization and spine motility. Synaptic strengths were reduced to compensate for extra synapses, keeping total synaptic input per neuron constant. Our data support a model in which synapse formation is promoted by actin-powered motility.

journal_name

Neuron

journal_title

Neuron

authors

Zito K,Knott G,Shepherd GM,Shenolikar S,Svoboda K

doi

10.1016/j.neuron.2004.09.022

subject

Has Abstract

pub_date

2004-10-14 00:00:00

pages

321-34

issue

2

eissn

0896-6273

issn

1097-4199

pii

S0896627304006336

journal_volume

44

pub_type

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