Spine growth precedes synapse formation in the adult neocortex in vivo

Détails

ID Serval
serval:BIB_B8E7FA451939
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Spine growth precedes synapse formation in the adult neocortex in vivo
Périodique
Nature Neuroscience
Auteur(s)
Knott  G. W., Holtmaat  A., Wilbrecht  L., Welker  E., Svoboda  K.
ISSN
1097-6256 (Print)
Statut éditorial
Publié
Date de publication
09/2006
Volume
9
Numéro
9
Pages
1117-24
Notes
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't --- Old month value: Sep
Résumé
Dendritic spines appear and disappear in an experience-dependent manner. Although some new spines have been shown to contain synapses, little is known about the relationship between spine addition and synapse formation, the relative time course of these events, or whether they are coupled to de novo growth of axonal boutons. We imaged dendrites in barrel cortex of adult mice over 1 month, tracking gains and losses of spines. Using serial section electron microscopy, we analyzed the ultrastructure of spines and associated boutons. Spines reconstructed shortly after they appeared often lacked synapses, whereas spines that persisted for 4 d or more always had synapses. New spines had a large surface-to-volume ratio and preferentially contacted boutons with other synapses. In some instances, two new spines contacted the same axon. Our data show that spine growth precedes synapse formation and that new synapses form preferentially onto existing boutons.
Mots-clé
Age Factors Animals Dendritic Spines/*physiology/ultrastructure Male Mice Microscopy, Electron Models, Anatomic Models, Neurological Neocortex/*physiology Synapses/*physiology/ultrastructure
Pubmed
Web of science
Création de la notice
24/01/2008 14:41
Dernière modification de la notice
20/08/2019 15:26
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