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Submitted on April 3, 2006
Accepted on July 31, 2006
PirB Restricts Ocular-Dominance Plasticity in Visual Cortex
Josh Syken 1, Tadzia GrandPre 1, Patrick O. Kanold 1, Carla J. Shatz 1*
1 Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, MA 02115, USA.
* To whom correspondence should be addressed.
Carla J. Shatz , E-mail: carla_shatz{at}hms.harvard.edu
Experience can alter synaptic connectivity throughout life,but the degree of plasticity present at each age is regulatedby mechanisms that remain largely unknown. Here we demonstratethat PirB, an MHC Class I (MHCI) receptor, is expressed in subsetsof neurons throughout the brain. Neuronal PirB protein is associatedwith synapses and forms complexes with the phosphatases Shp-1and Shp-2. Soluble PirB fusion protein binds to cortical neuronsin an MHCI-dependent manner. In mutant mice lacking functionalPirB, cortical ocular dominance (OD) plasticity is more robustat all ages. Thus, an MHCI receptor is expressed in CNS neuronsand functions to limit the extent of experience-dependent plasticityin the visual cortex throughout life. PirB is also expressedin many other regions of the CNS, suggesting that it may functionbroadly to stabilize neural circuits.
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