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A High-throughput Calcium-flux Assay to Study NMDA-receptors with Sensitivity to Glycine/D-serine and Glutamate
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D1/D5 modulation of synaptic NMDA receptor currents.

Juan A Varela1, Silke J Hirsch, David Chapman

  • 1Department of Psychiatry, University of Texas Southwestern, Dallas, Texas 75390, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 13, 2009
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Summary

D(1)/D(5) receptor activation in the hippocampus bidirectionally alters NMDA receptor plasticity, influencing learning and memory by changing NR2A/NR2B subunit ratios and synaptic responses.

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Learning and Memory

Background:

  • Monoamine release modulates behavior, and D(1)/D(5) receptor activation is crucial for hippocampal learning and memory.
  • The precise mechanisms by which D(1)/D(5) receptors influence hippocampal circuits in salience-associated learning remain unclear.

Purpose of the Study:

  • To investigate how D(1)/D(5) receptor activation modulates NMDA receptor-mediated synaptic currents in CA1 pyramidal neurons.
  • To determine the role of NMDA receptor subunit composition (NR2A/NR2B) in this modulation.
  • To elucidate the impact of this plasticity on hippocampal circuit function and salience-associated learning.

Main Methods:

  • Electrophysiological recordings in CA1 pyramidal neurons.
  • Manipulation of D(1)/D(5) receptor activation.
  • Analysis of NMDA receptor subunit composition (NR2A/NR2B) and synaptic currents.
  • Investigation of intracellular signaling pathways.

Main Results:

  • D(1)/D(5) receptor activation induced bidirectional long-term plasticity of NMDA receptor currents.
  • The plasticity's polarity depended on NMDA receptor subunit composition, decreasing the NR2A/NR2B ratio.
  • NR2B-containing NMDA receptors were potentiated, while NR2A-containing receptors were depressed, via distinct signaling pathways.
  • Synaptic potentiation occurred at CA3-CA1 synapses (rich in NR2B), while depression occurred at entorhinal-CA1 synapses (rich in NR2A).

Conclusions:

  • Endogenous D(1)/D(5) activation rejuvenates NMDA receptor composition towards immature states by decreasing the NR2A/NR2B ratio.
  • This modulation biases CA1 responsiveness towards the CA3-CA1 circuit over direct entorhinal input, influencing salience-associated learning.