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Related Experiment Videos

The N-methyl-D-aspartate receptor complex.

M Williams1, P A Loo, D E Murphy

  • 1Research Department, CIBA-GEIGY Corporation, Summit, New Jersey 07901.

Journal of Receptor Research
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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The N-methyl-D-aspartate (NMDA) receptor complex, including the phencyclidine (PCP) binding site and a cation channel, is supported by new data. This suggests a sequential interaction where PCP affects NMDA receptor responses.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • The N-methyl-D-aspartate (NMDA) receptor is a key player in synaptic plasticity and memory.
  • Dissociative anesthetics like phencyclidine (PCP) non-competitively inhibit NMDA receptor function.
  • Evidence suggests a potential NMDA/PCP receptor complex involving a cation channel.

Purpose of the Study:

  • To investigate the existence and characteristics of an NMDA/PCP receptor complex in mammalian brain tissue.
  • To determine the distinct binding profiles of NMDA antagonists and dissociative anesthetics at the PCP receptor.
  • To elucidate the sequential interaction between NMDA and PCP binding sites.

Main Methods:

  • Radioligand binding assays using tritiated TCP (thienylcyclohexylpiperidine) on rat cortical membranes.

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  • Experiments conducted under basal conditions, with L-glutamate, magnesium, and both L-glutamate and magnesium.
  • Evaluation of NMDA receptor antagonists and dissociative anesthetics' effects on TCP and CPP binding.

    • Main Results:

    • NMDA antagonists and dissociative anesthetics exhibited distinct activity profiles at the PCP receptor.
    • Both compound classes modulated TCP binding, but only NMDA antagonists inhibited CPP binding.
    • Data support the existence of an NMDA/PCP receptor complex, with a sequential NMDA-to-PCP interface.

    Conclusions:

    • The study provides strong evidence for an NMDA/PCP receptor complex in the mammalian brain.
    • The findings suggest a sequential interaction, with the PCP site influencing NMDA-mediated responses.
    • This complex plays a role in modulating NMDA receptor function at an intermediate step between activation and physiological response.