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Related Concept Videos

Hair Cells01:22

Hair Cells

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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.
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The Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
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The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Related Experiment Video

Updated: Aug 17, 2025

Dextran Labeling and Uptake in Live and Functional Murine Cochlear Hair Cells
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Dextran Labeling and Uptake in Live and Functional Murine Cochlear Hair Cells

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Mitochondrial form and function in hair cells.

James D B O'Sullivan1, Anwen Bullen2, Zoë F Mann1

  • 1Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral, Craniofacial Sciences, King's College London, London SE1 9RT, U.K.

Hearing Research
|December 16, 2022
PubMed
Summary
This summary is machine-generated.

Mitochondria are vital for hair cell function and survival. Understanding their role in healthy hair cells is key to preventing damage and hearing loss from factors like aging and noise.

Keywords:
Ca2+bufferingDevelopmentHearing lossMetabolismMitochondriaMitochondrial cristaeSynaptic transmission oxidative stress

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Area of Science:

  • Inner ear biology
  • Cell biology
  • Sensory neuroscience

Background:

  • Hair cells (HCs) are specialized sensory receptors essential for hearing and balance.
  • Mitochondria are critical for HC function, providing ATP for cellular processes and regulating calcium.
  • Mitochondrial dysfunction is implicated in hair cell death due to various stressors.

Purpose of the Study:

  • To investigate the distinct mitochondrial populations within hair cells.
  • To understand the relationship between mitochondrial morphology and function in normal hair cells.
  • To lay the groundwork for deciphering mechanisms of hair cell death.

Main Methods:

  • Advanced imaging techniques to study mitochondrial populations and their distribution.
  • Analysis of mitochondrial morphology in different cellular compartments of hair cells.
  • Comparative studies across species to observe mitochondrial responses to damage.

Main Results:

  • Distinct mitochondrial populations identified in apical and basolateral regions of hair cells.
  • Mitochondrial morphology appears compartmentalized, reflecting local physiological demands.
  • Ototoxic agents, aging, and noise damage impact mitochondrial structure and function, leading to hair cell death.

Conclusions:

  • Mitochondria exhibit specialized characteristics in different hair cell regions.
  • Understanding normal mitochondrial function is crucial for addressing hair cell degeneration.
  • Further research into mitochondrial mechanisms is needed to prevent hearing loss.