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Related Experiment Videos

Electrogenic pump (Na+/K(+)-ATPase) activity in rat optic nerve.

T R Gordon1, J D Kocsis, S G Waxman

  • 1Department of Neurology, Yale University School of Medicine, West Haven, CT 06516.

Neuroscience
|January 1, 1990
PubMed
Summary

This study reveals that the sodium-potassium pump (Na+/K+-ATPase) in rat optic nerves generates a late afterhyperpolarization after repetitive activity, impacting axonal excitability. This electrogenic pump activity is crucial for understanding nerve signal regulation.

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Area of Science:

  • Neuroscience
  • Cellular Physiology

Background:

  • The origin of late afterhyperpolarizations in central nervous system myelinated axons remains incompletely understood.
  • Investigating the role of electrogenic pumps in axonal excitability is crucial for understanding nerve function.

Purpose of the Study:

  • To investigate the origin of the late afterhyperpolarization following repetitive activity in rat optic nerves.
  • To determine the contribution of electrogenic pump activity (Na+/K+-ATPase) to axonal excitability.

Main Methods:

  • Utilized a sucrose gap chamber to record electrical activity in rat optic nerves.
  • Applied repetitive stimulation and various pharmacological blockers (strophanthidin, ouabain, tetraethylammonium, CoCl2) and ion substitutions (Li+ for Na+).
  • Measured post-train afterhyperpolarization duration, amplitude, and effects on compound action potential amplitude.

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Main Results:

  • Repetitive stimulation induced a prolonged, temperature-dependent post-train afterhyperpolarization.
  • This afterhyperpolarization was blocked by Na+/K+-ATPase inhibitors and Li+ substitution, indicating electrogenic pump involvement.
  • While potassium and calcium channel blockers had minimal effects, 4-aminopyridine revealed a transient tetraethylammonium-sensitive K+-channel contribution.
  • The afterhyperpolarization reduced axonal excitability, evidenced by decreased compound action potential amplitude.

Conclusions:

  • Electrogenic Na+/K+-ATPase activity contributes significantly to the late afterhyperpolarization in myelinated axons of the central nervous system.
  • This pump activity modulates axonal excitability following repetitive nerve activity.
  • A transient K+-channel also plays a role in the early phase of the post-train afterhyperpolarization.