Format

Send to

Choose Destination
See comment in PubMed Commons below
Neuron. 2004 Dec 16;44(6):1031-41.

Experience-dependent pruning of dendritic spines in visual cortex by tissue plasminogen activator.

Author information

1
Laboratory for Neuronal Circuit Development, Institute of Physical and Chemical Research (RIKEN), Brain Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

Abstract

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.

PMID:
15603745
DOI:
10.1016/j.neuron.2004.11.028
[Indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Support Center