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Single-cell persistent activity in anterodorsal thalamus.

Mauktik Kulkarni1, Kechen Zhang, Alfredo Kirkwood

  • 1Department of Neuroscience, Johns Hopkins University, Baltimore, MD 21218, United States.

Neuroscience Letters
|March 3, 2011
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Summary

Single thalamic neurons can sustain their own activity for minutes without synaptic input. This persistent firing, enhanced by serotonin, supports cellular mechanisms in the head-direction system.

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Area of Science:

  • Neuroscience
  • Cellular Electrophysiology

Background:

  • The anterodorsal thalamus is crucial for spatial navigation, containing head-direction cells.
  • Head-direction cell activity is thought to involve self-sustaining networks, but thalamic circuits lack strong recurrent connections.
  • The intrinsic cellular properties of thalamic neurons in sustaining activity remain unclear.

Purpose of the Study:

  • To investigate if individual thalamic neurons can maintain activity without synaptic input.
  • To explore the cellular mechanisms underlying persistent activity in the thalamus.

Main Methods:

  • Whole-cell patch-clamp recordings from anterodorsal thalamus neurons in brain slices.
  • Application of synaptic blockers to isolate intrinsic neuronal properties.
  • Stimulation with hyperpolarizing and depolarizing current pulses.

Main Results:

  • Individual thalamic neurons exhibited slow-decaying rebound firing after hyperpolarization, lasting minutes.
  • This persistent firing was graded with repeated stimulation and enhanced by serotonin.
  • Depolarizing pulses had minimal effect on the decay of persistent firing.

Conclusions:

  • Provides the first direct evidence for single-cell persistent activity in the thalamus.
  • Suggests that intrinsic cellular properties, not just network activity, contribute to thalamic functions like the head-direction system.