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Related Experiment Videos

NMDA receptor channels: subunit-specific potentiation by reducing agents

G Köhr1, S Eckardt, H Lüddens

  • 1Center for Molecular Biology (ZMBH), University of Heidelberg, Federal Republic of Germany.

Neuron
|May 1, 1994
PubMed
Summary

Sulfhydryl redox agents differentially modulate NMDA receptor subtypes. The NR1-NR2A channel shows reversible and persistent potentiation, while other subtypes exhibit only persistent potentiation.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • N-methyl-D-aspartate (NMDA) receptors are crucial ion channels involved in synaptic plasticity and excitotoxicity.
  • Sulfhydryl groups within proteins are known to be sensitive to redox modifications, potentially altering protein function.

Purpose of the Study:

  • To investigate the role of redox modulation on the activity of different NMDA receptor subtypes.
  • To identify potential redox-sensitive sites within NMDA receptors and their contribution to functional changes.

Main Methods:

  • Utilized patch-clamp electrophysiology to record L-glutamate-activated currents in recombinant NMDA receptors (NR1-NR2A, NR1-NR2B, NR1-NR2C, NR1-NR2D) expressed in 293 cells.
  • Applied sulfhydryl redox agents, such as dithiothreitol (DTT) and reduced glutathione, to assess their effects on receptor activity.

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  • Employed oxidizing agents and alkylation to probe the reversibility and nature of redox modifications.

    • Main Results:

    • Dithiothreitol (DTT) rapidly potentiated L-glutamate-activated currents in NR1-NR2A channels, with both reversible and persistent components.
    • Kinetic changes, including decreased desensitization and deactivation, were observed in NR1-NR2A channels upon DTT application.
    • NR1-NR2B, -NR2C, and -NR2D channels exhibited only slow, persistent potentiation and increased deactivation time course with DTT.
    • The DTT effect was reversible in NR1-NR2A but became insensitive to reoxidation after alkylation in NR1-NR2B, -NR2C, and -NR2D channels.
    • Reduced glutathione mimicked DTT effects exclusively in NR1-NR2A receptors.

    Conclusions:

    • Distinct NMDA receptor subtypes display significantly different responses to sulfhydryl redox agents.
    • The NR2A subunit contains a redox-sensitive site mediating reversible potentiation and kinetic changes.
    • These findings highlight the complex regulation of NMDA receptor function by redox state, with subtype-specific mechanisms.