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Updated: Jun 29, 2025
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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
Published on: May 10, 2019
11.8K
Synaptic ribbon dynamics after noise exposure in the hearing cochlea
Noura Ismail Mohamad1, Peu Santra1, Yesai Park1
1Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, USA.
Communications Biology
|April 6, 2024
Summary
Noise exposure causes cochlear synaptopathy by altering auditory synapses. Live imaging revealed increased ribbon volume and unanchoring, offering targets for hearing loss treatment.
Area of Science:
- Auditory Neuroscience
- Cell Biology
- Ototoxicology
Background:
- Noise exposure can lead to cochlear synaptopathy, characterized by the loss of auditory synapses.
- This synaptic damage is linked to functional hearing decline, but its dynamic changes remain unclear.
- Previous research focused on static changes in synaptic components after noise exposure.
Purpose of the Study:
- To visualize the dynamic changes of pre-synaptic ribbons in mature mouse cochleae after noise-induced synaptopathy.
- To observe the real-time behavior of synaptic components following noise exposure using live imaging.
Main Methods:
- Developed a live imaging model using RIBEYE-tagRFP.
- Observed pre-synaptic ribbons in mature mouse cochleae after synaptopathic noise exposure.
- Analyzed ribbon number, volume, and movement dynamics.
Main Results:
- Noise exposure did not alter the number of pre-synaptic ribbons.
- Noise induced an increase in ribbon volume and suggested unanchoring from synaptic tethers.
- A subset of basal ribbons showed coordinated movement towards the cochlear nucleus, followed by return to the cell membrane post-noise.
Conclusions:
- Immediate dynamics of synaptic damage after noise exposure can be visualized.
- Increased ribbon volume and unanchoring are key immediate effects of noise on auditory synapses.
- Understanding these dynamics may help identify therapeutic targets for cochlear synaptopathy and hearing loss.
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