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Related Concept Videos

Hair Cells01:22

Hair Cells

42.5K
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.
42.5K

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Related Experiment Video

Updated: Oct 24, 2025

Author Spotlight: Advancements in Cultivating Mouse Hair Cells for Auditory Research
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Cy3-RgIA-5727 Labels and Inhibits α9-Containing nAChRs of Cochlear Hair Cells.

Fernando Fisher1, Yuanyuan Zhang2, Philippe F Y Vincent2

  • 1Department of Biology, University of Utah, Salt Lake City, UT, United States.

Frontiers in Cellular Neuroscience
|August 13, 2021
PubMed
Summary

A novel fluorescent peptide, Cy3-RgIA-5727, visualizes nicotinic acetylcholine receptors (nAChRs) on inner ear hair cells. This tool confirms α9α10 nAChRs are primarily on outer hair cells and transiently on inner hair cells during development.

Keywords:
XenopuscochleaconotoxinmousenAChR

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Area of Science:

  • Neuroscience
  • Otolaryngology
  • Pharmacology

Background:

  • Efferent cholinergic neurons regulate sensory hair cell function in the inner ear via α9α10-containing nicotinic acetylcholine receptors (nAChRs).
  • Cone snail venom contains peptides with channel-blocking activities, offering potential tools for studying nAChRs.

Purpose of the Study:

  • To develop a fluorescently labeled antagonist for visualizing α9α10 nAChRs in the inner ear.
  • To investigate the precise localization and developmental expression of α9α10 nAChRs on hair cells.

Main Methods:

  • Synthesis of a fluorescently labeled conopeptide analog, Cy3-RgIA-5727, targeting α9α10 nAChRs.
  • Electrophysiological characterization of Cy3-RgIA-5727 on expressed nAChRs in *Xenopus* oocytes.
  • Visualization of nAChRs in excised mouse cochlear tissue using fluorescence microscopy.

Main Results:

  • Cy3-RgIA-5727 potently and selectively blocked mouse α9α10 nAChRs (IC50 = 23 pM).
  • Robust labeling of α9α10 nAChRs was observed at postsynaptic sites on outer hair cells (OHCs) in adult mice.
  • Transient labeling of inner hair cells (IHCs) was detected in young mice (postnatal day 10), correlating with developmental innervation.

Conclusions:

  • Cy3-RgIA-5727 is a valuable tool for visualizing α9α10 nAChRs in the inner ear.
  • α9α10 nAChRs are predominantly located on OHCs, with transient expression on IHCs during development.
  • The conopeptide antagonist demonstrates effective and irreversible blockade of native hair cell nAChRs.