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1.
Neuron ; 44(6): 1031-41, 2004 Dec 16.
Artículo en Inglés | MEDLINE | ID: mdl-15603745

RESUMEN

Sensory experience physically rewires the brain in early postnatal life through unknown processes. Here, we identify a robust anatomical consequence of monocular deprivation (MD) in layer II/III of visual cortex that corresponds to the rapid, functional loss of responsiveness preceding any changes in axonal input. Protrusions on pyramidal cell apical dendrites increased steadily after eye opening, but were transiently lost through competitive mechanisms after brief MD only during the physiological critical period. Proteolysis by tissue-type plasminogen activator (tPA) conversely declined with age and increased with MD only in young mice. Targeted disruption of tPA release or its upstream regulation by glutamic acid decarboxylase (GAD65) prevented MD-induced spine loss that was pharmacologically rescued concomitant with critical period plasticity. An extracellular mechanism for structural remodeling that is limited to the binocular zone upon proper detection of competing inputs thus links early sensory experience to visual function.


Asunto(s)
Espinas Dendríticas/enzimología , Privación Sensorial/fisiología , Activador de Tejido Plasminógeno/fisiología , Visión Monocular/fisiología , Corteza Visual/enzimología , Animales , Espinas Dendríticas/fisiología , Glutamato Descarboxilasa/fisiología , Humanos , Isoenzimas/fisiología , Ratones , Ratones Noqueados , Activador de Tejido Plasminógeno/antagonistas & inhibidores , Activador de Tejido Plasminógeno/deficiencia , Activador de Tejido Plasminógeno/genética , Corteza Visual/citología
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