Synapse-specific downregulation of NMDA receptors by early experience: a critical period for plasticity of sensory input to olfactory cortex.

Published

Journal Article

Olfaction is required at birth for survival; however, little is known about the maturation of olfactory cortical circuits. Here we show that in vivo sensory experience mediates the development of excitatory transmission in pyramidal neurons of rat olfactory cortex. We find a postnatal critical period during which there is an experience-dependent increase in the contribution of AMPARs versus NMDARs to transmission at primary sensory synapses but not associational inputs. The shift in receptors underlying transmission is mediated by a strong activity-dependent downregulation of NMDARs and modest increase in AMPARs. Sensory activity leads to a loss of "silent" NMDAR-only synapses and an increase in threshold for inducing long-term plasticity. These results indicate the importance of early olfactory experience in the establishment of cortical circuits and could reflect mechanisms governing early olfactory "imprinting."

Full Text

Duke Authors

Cited Authors

  • Franks, KM; Isaacson, JS

Published Date

  • July 7, 2005

Published In

Volume / Issue

  • 47 / 1

Start / End Page

  • 101 - 114

PubMed ID

  • 15996551

Pubmed Central ID

  • 15996551

International Standard Serial Number (ISSN)

  • 0896-6273

Digital Object Identifier (DOI)

  • 10.1016/j.neuron.2005.05.024

Language

  • eng

Conference Location

  • United States