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Related Experiment Videos

Calcium-induced actin depolymerization reduces NMDA channel activity

C Rosenmund1, G L Westbrook

  • 1Vollum Institute, Department of Physiology, Oregon Health Sciences University, Portland 97201.

Neuron
|May 1, 1993
PubMed
Summary
This summary is machine-generated.

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Actin filaments regulate NMDA channel activity. Blocking actin depolymerization prevents NMDA channel rundown, suggesting actin

Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • Actin filaments are abundant in postsynaptic densities of central excitatory synapses.
  • The role of actin filaments in modulating postsynaptic glutamate receptor function remains unclear.

Purpose of the Study:

  • To investigate the influence of actin depolymerization on NMDA channel activity.
  • To determine if actin dynamics affect NMDA receptor function in cultured hippocampal neurons.

Main Methods:

  • Whole-cell patch-clamp recordings were performed on cultured hippocampal neurons.
  • Actin depolymerization was manipulated using phalloidin and cytochalasins.
  • The effects on NMDA and AMPA/kainate receptor channel activity were assessed.

Related Experiment Videos

Main Results:

  • Phalloidin, which blocks actin depolymerization, prevented ATP- and calcium-dependent NMDA channel rundown.
  • Cytochalasins, promoting actin depolymerization, induced NMDA channel rundown.
  • AMPA/kainate receptor rundown was not affected by phalloidin; microtubule agents and protease inhibitors had no effect.

Conclusions:

  • Actin polymerization state, influenced by calcium and ATP, modulates NMDA channel activity.
  • Findings support a model where actin filaments compartmentalize regulatory proteins affecting NMDA channels.