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Related Experiment Videos

Activity-dependent decrease of excitability in rat hippocampal neurons through increases in I(h).

Yuan Fan1, Desdemona Fricker, Darrin H Brager

  • 1Center for Learning and Memory, University of Texas at Austin, 1 University Station, C7000, Austin, Texas 78712, USA.

Nature Neuroscience
|October 20, 2005
PubMed
Summary
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Theta-burst stimulation causes a decrease in cellular excitability, mediated by h-channels and NMDA receptors. This finding reveals a novel negative feedback mechanism for neuronal network stability.

Area of Science:

  • Neuroscience
  • Cellular excitability
  • Synaptic plasticity

Background:

  • Hippocampal long-term potentiation (LTP) involves increased synaptic strength and dendritic excitability.
  • Theta-burst stimulation is a common method to induce LTP in the hippocampus.

Purpose of the Study:

  • To investigate the effects of theta-burst pairing on cellular excitability.
  • To identify the molecular mechanisms underlying changes in excitability during LTP induction.

Main Methods:

  • Electrophysiological recordings in the hippocampus.
  • Application of pharmacological blockers (ZD7288, NMDA antagonists, omega-conotoxin MVIIC).
  • Postsynaptic calcium chelation and protein synthesis inhibition.
  • Manipulation of extracellular potassium concentration.

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Main Results:

  • Theta-burst stimulation induced a decrease in cellular excitability, distinct from synaptic potentiation.
  • This excitability decrease was blocked by h-channel blockers, NMDA receptor antagonists, and other inhibitors.
  • Increased network activity led to reduced excitability and increased HCN1 protein expression.

Conclusions:

  • Backpropagating action potentials activate NMDA receptors, increasing Ih and reducing cellular excitability.
  • This excitability reduction acts as a negative feedback loop, stabilizing neuronal output during LTP.
  • The findings highlight a novel mechanism for maintaining neuronal network stability.