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Reactivation of Ocular Dominance Plasticity in the Adult Visual Cortex
Tommaso Pizzorusso,12*Paolo Medini,1Nicoletta Berardi,24Sabrina Chierzi,3James W. Fawcett,3Lamberto Maffei12
In young animals, monocular deprivation leads to an
ocular dominance shift, whereas in adults after the critical period
thereis no such shift. Chondroitin sulphate proteoglycans (CSPGs) arecomponents of the extracellular matrix (ECM) inhibitory for axonalsprouting. We tested whether the developmental maturation of theECM is
inhibitory for experience-dependent plasticity in the visualcortex.
The organization of CSPGs into perineuronal nets coincidedwith the end
of the critical period and was delayed by dark rearing.After CSPG
degradation with chondroitinase-ABC in adult rats,monocular
deprivation caused an ocular dominance shift towardthe nondeprived
eye. The mature ECM is thus inhibitory for experience-dependentplasticity, and degradation of CSPGs reactivates cortical plasticity.
1 Scuola Normale Superiore, 56100 Pisa, Italy.
2 Istituto di Neuroscienze, Consiglio Nazionale
Ricerche, via Moruzzi 1, 56100 Pisa, Italy.
3 Cambridge University Centre for Brain Repair,
Robinson Way, Cambridge CB2 2PY, UK.
4 Dipartimento
di Psicologia, Università di Firenze, 50123 Firenze, Italy.
*
To whom correspondence should be addressed. E-mail:
tommaso{at}in.pi.cnr.it
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