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Updated: Sep 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
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Autophagy-Mediated Synaptic Refinement and Auditory Neural Pruning Contribute to Ribbon Synaptic Maturity in the
Rui Guo1, Yice Xu2, Wei Xiong1
1Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Frontiers in Molecular Neuroscience
|March 21, 2022
Summary
Auditory development involves significant changes in cochlear ribbon synapses. Autophagy activity plays a key role in refining these synapses and pruning spiral ganglion nerve (SGN) fibers during early hearing maturation.
Area of Science:
- Neuroscience
- Developmental Biology
- Auditory System Research
Background:
- Massive initial synapses form in the auditory system during early postnatal development.
- A significant reduction in cochlear afferent synapses occurs as development progresses.
Purpose of the Study:
- To investigate the hypothesis that cochlear ribbon synapse numbers change dramatically with hearing development.
- To quantitatively assess changes in synaptic number and SGN fibers during ribbon synapse development.
Main Methods:
- Utilized tracers to estimate autophagy activity during ribbon synapse development in mice.
- Quantitatively measured changes in synaptic numbers and spiral ganglion nerve (SGN) fibers.
Main Results:
- Observed robust expression of autophagy markers (LC3B, LAMP1, LysoTracker) near inner hair cells and cochlear ribbon synapses.
- Detected a significant decrease in SGN fiber intensity during ribbon synapse development and hearing onset.
Conclusions:
- Ribbon synapse refinement and SGN fiber pruning are linked to the maturation of ribbon synapses.
- Autophagy actively regulates synaptic refinement and SGN fiber pruning in early auditory development.
Keywords:
auditory developmentautophagycochlear ribbon synapsesneural fibers pruningsynaptic refinementMore Related Videos
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