Hippocampal LTP is accompanied by enhanced F-actin content within the dendritic spine that is essential for late LTP maintenance in vivo

Yugo Fukazawa, Yoshito Saitoh, Fumiko Ozawa, Yasuhiko Ohta, Kensaku Mizuno, Kaoru Inokuchi

Research output: Contribution to journalArticlepeer-review

537 Citations (Scopus)

Abstract

The dendritic spine is an important site of neuronal plasticity and contains extremely high levels of cytoskeletal actin. However, the dynamics of the actin cytoskeleton during synaptic plasticity and its in vivo function remain unclear. Here we used an in vivo dentate gyrus LTP model to show that LTP induction is associated with actin cytoskeletal reorganization characterized by a long-lasting increase in F-actin content within dendritic spines. This increase in F-actin content is dependent on NMDA receptor activation and involves the inactivation of actin depolymerizing factor/cofilin. Inhibition of actin polymerization with latrunculin A impaired late phase of LTP without affecting the initial amplitude and early maintenance of LTP. These observations suggest that mechanisms regulating the spine actin cytoskeleton contribute to the persistence of LTP.

Original languageEnglish
Pages (from-to)447-460
Number of pages14
JournalNeuron
Volume38
Issue number3
DOIs
Publication statusPublished - 2003 May 8

ASJC Scopus subject areas

  • Neuroscience(all)

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