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Related Concept Videos

Unrenewable Cells00:50

Unrenewable Cells

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.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...

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Related Experiment Video

Updated: Jun 21, 2026

Cochlear Surface Preparation in the Adult Mouse
09:51

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Published on: November 6, 2019

Supporting cell characteristics in long-deafened aged mouse ears.

Elizabeth C Oesterle1, Sean Campbell

  • 1Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle, WA, 98195, USA. oesterle@u.washington.edu

Journal of the Association for Research in Otolaryngology : JARO
|August 1, 2009
PubMed
Summary

Hair cell loss causes hearing deficits. In deafened mouse ears, remaining non-sensory support cells retained key markers, suggesting they did not dedifferentiate significantly, impacting future hair cell regeneration therapies.

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Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage

Published on: February 10, 2023

Area of Science:

  • Oto-neuroscience
  • Regenerative Medicine
  • Cell Biology

Background:

  • Significant sensory hair cell loss results in irreversible hearing and balance impairments in mammals.
  • Understanding the status of non-sensory cells in damaged auditory epithelium is crucial for developing therapeutic strategies like gene therapy or stem cell transplantation.
  • Current knowledge regarding the characteristics of remaining non-sensory cells in deafened ears is limited.

Purpose of the Study:

  • To investigate the status and characteristics of non-sensory cells in the damaged auditory epithelium of adult mice one year after induced hair cell loss.
  • To determine if remaining support cells in the deafened cochlea exhibit signs of dedifferentiation.

Main Methods:

  • Hair cells were ablated in adult mice using a single high-dose injection of kanamycin and furosemide.
  • Mice were examined one year post-insult to assess hair cell and non-sensory cell populations.
  • Expression of support cell markers (acetylated tubulin, Sox2, Jagged1) was analyzed in remaining non-sensory epithelial cells.

Main Results:

  • A single drug insult caused extensive outer hair cell loss and significant loss of inner hair cells, organ of Corti support cells, and spiral ganglion cells.
  • Non-sensory epithelial cells in the damaged organ of Corti maintained expression of acetylated tubulin, Sox2, and Jagged1.
  • These markers were retained even when the epithelium adopted a monolayer-like appearance.

Conclusions:

  • The non-sensory epithelial cells in severely damaged and aged mouse ears did not show marked dedifferentiation.
  • These findings provide critical insights into the state of the cellular environment for potential hair cell regeneration therapies.