Outer Hair Cells
Outer Hair Cells - Related Videos
09:35
Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis
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Cited by 3 •
2011
A reliable method to investigate outer hair cell (OHC) motile responses, including electromotility, slow motility and bending, is described. OHC motility is elicited by stimulation with an external alternating electrical field, and the method takes advantage of high-speed image recording, LED-based illumination, and last generation image analysis software.
01:22
Hair Cells
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2019
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here. Hair cells are named after...
09:23
Auditory Brainstem Response and Outer Hair Cell Whole-cell Patch Clamp Recording in Postnatal Rats
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Cited by 9 •
2018
This protocol describes methods to record the auditory brainstem response from postnatal rat pups. To examine the functional development of outer hair cells, the experimental procedure of whole-cell patch clamp recording in isolated outer hair cells is described step-by-step.
05:18
Imaging Calcium Dynamics in Lateral-Line Hair Cells of Larval Zebrafish
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2025
Source: Lukasz, D., et al. In Vivo Calcium Imaging of Lateral-line Hair Cells in Larval Zebrafish. J. Vis. Exp. (2018)This video demonstrates live imaging of calcium influx in the lateral-line hair cells of a paralyzed transgenic zebrafish larva using a confocal microscope. Mechanical stimulation of hair bundles via fluid pulses induces calcium entry through mechanotransduction channels and voltage-gated channels, which is visualized in real-time using fluorescence indicators. The method...
07:13
Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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2023
Here, we present a protocol for a mouse model of noise-induced hearing loss (NIHL). To induce NIHL, we developed a new and simple device using corrugated plastic, a rat trap cage, and a speaker. Auditory brainstem response and immunofluorescence imaging were employed to assess the hearing function and outer hair cell damage, respectively.
FAQs
Prestin links the cells’ membrane potential to rapid changes in cell length. After stereocilia movement changes mechanotransduction-channel activity, the resulting electrical change drives prestin-dependent contraction or expansion. This motion feeds mechanical energy back into the cochlear partition, strengthening sound-induced vibration and helping the auditory system detect quiet sounds with sharper frequency selectivity.
Stereocilia bending provides the initial mechanical signal that alters mechanotransduction-channel activity. Those channels change the outer hair cell’s membrane potential, which then controls prestin-driven changes in cell length. This sequence connects basilar-membrane motion to active mechanical feedback, allowing the cell to influence cochlear vibration rather than merely respond passively to sound.
Frequency selectivity is enhanced because outer hair cell motility feeds energy back into the cochlear partition at the site of sound-induced vibration. By amplifying relevant mechanical motion and increasing sensitivity, this feedback sharpens the cochlea’s response to different frequencies. The result is more precise auditory discrimination, not simply a general increase in sound intensity.
These exposures are important because outer hair cells are vulnerable to noise, aging, and ototoxic drugs. Damage to them can compromise cochlear amplification, reducing the mechanisms that support quiet-sound detection and precise frequency selectivity. Their vulnerability therefore makes them useful indicators and experimental targets when investigators study the biological basis of sensorineural hearing loss.
Studying these cells reveals how mechanical motion, membrane electrical changes, and cellular motor activity interact within the cochlea. This makes outer hair cells a model for examining sensory transduction and active amplification in the nervous system. Their contribution to hearing sensitivity and frequency precision also connects cellular mechanisms with measurable auditory function.
Because outer hair cell injury is associated with noise, aging, and ototoxic drugs, these cells provide a focused system for investigating ways to protect or restore cochlear function. Research can use their mechanotransduction and prestin-dependent mechanical response as functional reference points. Preserving or recovering these processes could support sensitivity to quiet sounds and accurate frequency processing.