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Motility of dendritic spines in visual cortex in vivo: changes during the critical period and effects of visual deprivation.

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Motility of dendritic spines in visual cortex in vivo: changes during the critical period and effects of visual deprivation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Majewska, Ania Sur, Mriganka
Description	Author Affiliation: Majewska A ( Department of Brain and Cognitive Sciences, Picower Center for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. majewska@mit.edu);
Abstract	Cortical dendritic spines are highly motile postsynaptic structures onto which most excitatory synapses are formed. It has been postulated that spine dynamics might reflect synaptic plasticity of cortical neurons. To test this hypothesis, we have investigated spine dynamics during the critical period in mouse visual cortex in vivo with and without sensory deprivation. The motility of spines on apical dendrites of layer 5 neurons was assayed by time-lapse two-photon microscopy. Spines were motile at the ages examined, postnatal days (P)21-P42, although motility decreased between P21 and P28 and then remained stable through P42. Binocular deprivation from before the time of eye-opening up-regulated spine motility during the peak of the critical period (P28), without affecting average spine length, class distribution, or density. Deprivation at the start of the critical period had no effect on spine motility, whereas continued deprivation through the end of the critical period appeared to reduce spine motility slightly. We conclude that spine motility might be involved in critical-period plasticity and that reduction of activity during the critical period enhances spine dynamics.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	26
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Dendrites Physiology Pyramidal Cells Sensory Deprivation Vision, Binocular Visual Cortex Aging Animals Ultrastructure Mice Mice, Inbred C57BL Mice, Transgenic Movement Growth & Development Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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