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Related Experiment Videos

Ionic basis of the caesium-induced depolarisation in rat supraoptic nucleus neurones.

M Ghamari-Langroudi1, C W Bourque

  • 1Centre for Research in Neuroscience, Montreal General Hospital and McGill University, 1650 Cedar Avenue, Montreal, QC, Canada H3G 1A4.

The Journal of Physiology
|November 3, 2001
PubMed
Summary

External cesium (Cs+) affects rat magnocellular neurosecretory cells by blocking the hyperpolarization-activated inward current (I(H)) and a potassium (K+) leakage current, influencing cell resting potential.

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Area of Science:

  • Neuroscience
  • Cell Physiology

Background:

  • Magnocellular neurosecretory cells in the supraoptic nucleus regulate vital physiological functions.
  • Understanding ion channel activity is crucial for comprehending neuronal excitability.

Purpose of the Study:

  • To investigate the effects of external cesium (Cs+) on rat magnocellular neurosecretory cells.
  • To identify the specific ion currents affected by Cs+.

Main Methods:

  • Intracellular recordings from 93 supraoptic nucleus neurons in rat hypothalamus explants.
  • Voltage-current and voltage-clamp analysis to study membrane properties and ion currents.
  • Application of Cs+, ZD 7288 (I(H) blocker), and tetraethyl ammonium (TEA).

Main Results:

Related Experiment Videos

  • External Cs+ caused membrane depolarization and increased firing rate.
  • Cs+ blocked the hyperpolarization-activated inward current (I(H)).
  • Cs+ also blocked a voltage-independent leakage potassium (K+) current, significantly impacting resting potential.

    • Conclusions:

    • External Cs+ has a dual effect, inhibiting both I(H) and a significant K+ leakage current in these neurons.
    • These currents play a critical role in establishing the resting membrane potential of magnocellular neurosecretory cells.