Experience-dependent, Rapid Structural Changes in Hippocampal Pyramidal Cell Spines

Overview

Journal Cereb Cortex

Publisher Oxford University Press

Specialty Neurology

Date 2009 Feb 26

PMID 19240139

Citations 20

Authors

Takuma Kitanishi

Yuji Ikegaya

Norio Matsuki

Maki K Yamada

Affiliations

Soon will be listed here.

Abstract

Morphological changes in dendritic spines may contribute to the fine tuning of neural network connectivity. The relationship between spine morphology and experience-dependent neuronal activity, however, is largely unknown. In the present study, we combined 2 histological analyses to examine this relationship: 1) Measurement of spines of neurons whose morphology was visualized in brain sections of mice expressing membrane-targeted green fluorescent protein (Thy1-mGFP mice) and 2) Categorization of CA1 neurons by immunohistochemical monitoring of Arc expression as a putative marker of recent neuronal activity. After mice were exposed to a novel, enriched environment for 60 min, neurons that expressed Arc had fewer small spines and more large spines than Arc-negative cells. These differences were not observed when the exploration time was shortened to 15 min. This net-balanced structural change is consistent with both synapse-specific enhancement and suppression. These results provide the first evidence of rapid morphological changes in spines that were preferential to a subset of neurons in association with an animal's experiences.

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