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Related Experiment Videos

Ca(2+)-activated nonselective cationic current (I(CAN)) in turtle motoneurons.

J F Perrier1, J Hounsgaard

  • 1Department of Medical Physiology, Panum Institute, University of Copenhagen, DK-2200 Copenhagen N, Denmark.

Journal of Neurophysiology
|August 13, 1999
PubMed
Summary

Researchers investigated calcium-activated nonspecific cationic (CAN) currents in turtle motoneurons. Findings indicate CAN currents are not the primary drivers of plateau potentials, bistability, or wind-up phenomena.

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Area of Science:

  • Neuroscience
  • Cellular Physiology

Background:

  • Turtle motoneurons exhibit complex electrophysiological properties like plateau potentials, bistability, and wind-up.
  • Calcium-activated nonspecific cationic (CAN) currents are known to influence neuronal excitability.

Purpose of the Study:

  • To investigate the presence and role of CAN currents in turtle motoneurons.
  • To determine the involvement of CAN currents in generating plateau potentials, bistability, and wind-up.

Main Methods:

  • Intracellular recordings were performed in a turtle spinal cord slice preparation.
  • Pharmacological agents like tetraethylammonium (TEA) and tetrodotoxin (TTX) were used.
  • Extracellular sodium was replaced with choline or N-methyl-D-glucamine (NMDG) to assess ion dependency.

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Main Results:

  • A calcium-dependent afterdepolarization, mediated by a CAN current, was observed following calcium action potentials.
  • Plateau potentials, bistability, and wind-up could be generated independently of sodium ions.
  • These phenomena persisted even when sodium was replaced, indicating it's not the principal charge carrier.

Conclusions:

  • While CAN currents are present and detectable in turtle motoneurons, they are not the primary determinants of plateau potentials, bistability, or wind-up.
  • The mechanisms underlying plateau potentials, bistability, and wind-up in these neurons do not rely on CAN current activity as the principal charge carrier.