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Hyperpolarization-activated current (Ih) in primary auditory neurons

C Chen1

  • 1Kresge Hearing Research Laboratory of the South, Department of Otorhinolaryngology and Biocommunication, Louisiana State University Medical Center, New Orleans 70112, USA. cchen@lsumc.edu

Hearing Research
|August 1, 1997
PubMed
Summary
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A hyperpolarization-activated current (I[h]) was identified in primary auditory neurons. This inward cation current may play a role in auditory nerve firing patterns.

Area of Science:

  • Neuroscience
  • Electrophysiology
  • Auditory System Research

Background:

  • The hyperpolarization-activated current (I[h]) is crucial for pacemaker activity in cardiac and neuronal cells.
  • Its presence and function in primary auditory neurons remain largely uncharacterized.

Purpose of the Study:

  • To investigate the existence and properties of a hyperpolarization-activated inward cation current in mammalian primary auditory neurons.
  • To determine the potential role of this current in auditory nerve signal transmission.

Main Methods:

  • Whole-cell patch-clamp recordings were utilized to measure ionic currents in primary auditory neurons.
  • Pharmacological agents (Cs+, Ba2+), varying ionic concentrations (Na+, K+), and intracellular signaling molecules (cAMP, cGMP) were employed to characterize the current.

Related Experiment Videos

  • Voltage-dependence and kinetic properties of the current were analyzed.

    • Main Results:

    • A significant inward, non-inactivating current was observed during hyperpolarizing voltage steps.
    • This current exhibited voltage-dependent activation, a depolarizing sag during hyperpolarization, and an overshoot upon current termination.
    • The current was reversibly blocked by Cs+, indicating its I[h] channel mediation, and its conductance was modulated by Na+, K+, cAMP, and cGMP levels.
    • The reversal potential was measured at -36 mV, and activation kinetics were voltage-dependent and fitted by a double exponential function.

    Conclusions:

    • Mammalian primary auditory neurons possess a hyperpolarization-activated inward cation current, consistent with I[h].
    • This I[h] current likely contributes a depolarizing influence during the repolarization phase of auditory nerve firing.
    • The findings provide new insights into the intrinsic electrophysiological properties of primary auditory neurons and their role in auditory processing.