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NMDA receptors are important for synaptic plasticity, including long-term potentiation (LTP) and long-term depression (LTD). To help investigate the precise location of the NMDA receptors that are required for different types of synaptic plasticity, we synthesized a caged form of the use-dependent NMDA receptor antagonist MK801, which we loaded into individual neurons in vitro, followed by compartment-specific uncaging. We used this method to investigate timing-dependent plasticity at layer 4-layer 2/3 synapses of mouse barrel cortex. Somatodendritic photorelease of MK801 in the postsynaptic neuron produced a use-dependent block of synaptic NMDA receptor-mediated currents and prevented the induction of LTP. Compartment-specific photorelease of MK801 in the presynaptic neuron showed that axonal, but not somatodendritic, presynaptic NMDA receptors are required for induction of LTD. The rate of use-dependent block of postsynaptic NMDA receptor current was slower following induction of LTD, consistent with a presynaptic locus of expression. Thus, this new caged compound has demonstrated the axonal location of NMDA receptors required for induction and the presynaptic locus of expression of LTD at layer 4-layer 2/3 synapses.

Original publication

DOI

10.1523/JNEUROSCI.0274-11.2011

Type

Journal article

Journal

J Neurosci

Publication Date

08/06/2011

Volume

31

Pages

8564 - 8569

Keywords

Animals, Dizocilpine Maleate, Electrophysiology, Excitatory Amino Acid Antagonists, Long-Term Synaptic Depression, Mice, Neurons, Receptors, N-Methyl-D-Aspartate, Somatosensory Cortex, Synapses