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Related Experiment Videos

An arthropod NMDA receptor.

C Pfeiffer-Linn1, R M Glantz

  • 1Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77251.

Synapse (New York, N.Y.)
|September 1, 1991
PubMed
Summary
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Researchers identified N-methyl-D-aspartate (NMDA) receptors in crayfish visual interneurons, suggesting a role in visual adaptation. This marks the first discovery of NMDA receptors in an invertebrate species.

Area of Science:

  • Neuroscience
  • Invertebrate Physiology
  • Visual Processing

Background:

  • Crayfish visual interneurons exhibit excitatory postsynaptic potentials (EPSPs) upon illumination.
  • L-glutamate, quisqualate, and kainate can mimic the natural transmitter's depolarizing effect.

Purpose of the Study:

  • To investigate the presence and function of N-methyl-D-aspartate (NMDA) receptors in crayfish visual interneurons.
  • To explore the ionic mechanisms and modulatory effects on NMDA receptor activity in this invertebrate model.

Main Methods:

  • Electrophysiological recordings from crayfish visual interneurons.
  • Application of various agonists (L-glutamate, quisqualate, kainate, NMDA) and antagonists (glycine, kynurenate, D-AP7).
  • Manipulation of extracellular magnesium and intracellular cesium to study ionic conductances and reversal potentials.

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Main Results:

  • NMDA application induced depolarization with a reversal potential of -60 mV in reduced Mg2+.
  • The NMDA response reversal potential was independent of extracellular calcium but shifted with potassium conductance blockade.
  • Glycine enhanced and prolonged NMDA responses, while kynurenate competitively blocked glycine's action.
  • D-AP7 selectively blocked NMDA responses and enhanced the overall EPSP.

Conclusions:

  • The findings suggest NMDA receptors in crayfish may gate multiple ionic channels.
  • NMDA receptor activity is modulated by glycine, similar to vertebrate systems.
  • The characterized NMDA receptor function aligns with a role in the neural mechanisms of visual adaptation in crayfish.
  • This study represents the first documented instance of an NMDA receptor in an invertebrate.