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The mechanisms underlying experience-dependent
plasticity in the brain may depend on the AMPA subclass of glutamate
receptors(AMPA-Rs). We examined the trafficking of AMPA-Rs into
synapsesin the developing rat barrel cortex. In vivo gene delivery wascombined with in vitro recordings to show that experience drivesrecombinant GluR1, an AMPA-R subunit, into synapses formed betweenlayer 4 and layer 2/3 neurons. Moreover, expression of the GluR1cytoplasmic tail, a construct that inhibits synaptic deliveryof
endogenous AMPA-Rs during long-term potentiation, blocked
experience-drivensynaptic potentiation. In general, synaptic
incorporation of AMPA-Rsin vivo conforms to rules identified in vitro
and contributesto plasticity driven by natural stimuli in the
mammalian brain.
1 Jones Laboratory,
2 Howard
Hughes Medical Institute, Cold Spring Harbor Laboratory, Cold Spring
Harbor, NY 11724, USA.
*
To whom correspondence should be addressed. E-mail:
malinow{at}cshl.org
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