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Outer hair cell electromotility and otoacoustic emissions
1Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2195.
Ear and Hearing
|April 1, 1990
Summary
Outer hair cells (OHCs) generate sound via electromotility, a process dependent on cell turgor. Salicylate weakens the OHC hydraulic skeleton, reducing turgor and impairing electromotility, which impacts otoacoustic emissions.
Area of Science:
- Auditory Neuroscience
- Cellular Biophysics
- Mechanobiology
Background:
- Outer hair cells (OHCs) exhibit electromotility, a rapid length change crucial for hearing.
- This electromotility is linked to spontaneous otoacoustic emissions.
- OHCs require both flexibility for movement and rigidity for structural integrity.
Purpose of the Study:
- To investigate the mechanical properties of OHCs.
- To elucidate the role of cell turgor in OHC electromotility.
- To understand the effect of salicylate on OHC function and otoacoustic emissions.
Main Methods:
- Analysis of OHC electromotility in response to electrical stimulation.
- Investigation of the OHC hydraulic skeleton and cell turgor.
- Assessment of salicylate's impact on OHC turgor and electromotility.
Main Results:
- OHCs possess a unique hydraulic skeleton providing compressive strength and flexibility.
- Cell turgor is essential for maintaining OHC electromotility.
- Salicylate diminishes OHC turgor and electromotility, affecting otoacoustic emissions.
Conclusions:
- OHC electromotility relies on a turgor-maintained hydraulic skeleton.
- Disrupting OHC turgor, e.g., with salicylate, impairs sound amplification and otoacoustic emissions.
- OHCs play a critical role in auditory function and are sensitive to pharmacological agents.