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Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis
Published on: July 18, 2011
Modulation of outer hair cell electromotility by cochlear supporting cells and gap junctions
1Department of Surgery-Otolaryngology, University of Kentucky Medical Center, Lexington, Kentucky, United States of America.
Plos One
|November 26, 2009
Summary
Deiters cells (DCs) modulate outer hair cell (OHC) function through mechanical coupling, not electrical signals. This discovery reveals a new mechanism influencing hearing sensitivity via supporting cells in the inner ear.
Area of Science:
- Auditory Neuroscience
- Cellular Biophysics
- Otoacoustic Emissions
Background:
- Outer hair cells (OHCs) are crucial for hearing sensitivity and frequency selectivity through their electromotility.
- Deiters cells (DCs) physically support OHCs on the basilar membrane and are interconnected by gap junctions.
Purpose of the Study:
- To investigate how Deiters cells (DCs) influence outer hair cell (OHC) electromotility.
- To determine the mechanisms of modulation, specifically electrical versus mechanical coupling.
Main Methods:
- Electrical and mechanical stimulation of DCs.
- Measurement of OHC electromotility, nonlinear capacitance (NLC), and distortion products.
- Perturbation of DC cytoskeleton and DC-OHC mechanical coupling.
- Alteration of gap junctional coupling between DCs.
Main Results:
- Depolarization and increased turgor pressure in DCs modulated OHC electromotility and NLC.
- Effects were abolished by disrupting DC cytoskeleton or DC-OHC mechanical coupling, indicating mechanical mediation.
- Changes in gap junctional coupling between DCs also shifted OHC NLC.
Conclusions:
- Deiters cells mechanically modulate OHC electromotility via cytoskeleton and DC-OHC coupling.
- Gap junctional coupling between DCs plays a role in modulating OHC function.
- Reveals a novel mechanism for cochlear supporting cells in regulating hearing sensitivity.
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