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Activity-Dependent Neurodegeneration and Neuroplasticity of Auditory Neurons Following Conductive Hearing Loss in Adult Mice

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Abstract

We examined the functional and structural changes of auditory neurons (ANs) in adult mice after conductive hearing loss (CHL). Earplugs (EPs) were bilaterally inserted in male 8-week-old mice for 4 weeks [EP(+) group] and subsequently removed for 4 weeks [EP(+/−) group]. We examined the control mice [EP(−) group] with no EPs inserted at 12 weeks. The auditory brainstem response (ABR) was measured to determine the cochlear function before and after EP insertion, after EP removal, and at 4 weeks following EP removal. We examined the cochleae for hair cell (HC) and spiral ganglion neuron survival, synaptic and neural properties, and AN myelination. There was a significant elevation of the ABR threshold across all tested frequencies after EP insertion. After removing the occlusion, these threshold shifts were fully recovered. Compared with the EP(−) mice, the EP(+) mice showed a significant decrease in the ABR peak 1 amplitude and a significantly prolonged latency at all tested frequencies. There was no significant effect of auditory deprivation on the survival of HCs and ANs. Conversely, auditory deprivation caused significant damage to the synapses and myelin and a significant decrease in the AN size. Although functional changes in the ABR amplitude and latency did not fully recover in the EP(+/−) mice, almost all anatomical changes were fully recovered in the EP(+/−) mice; however, cochlear synapses only showed partial recovery. These results suggest that auditory activities are required to maintain peripheral auditory synapses and myelination in adults. The auditory deprivation model allows for assessment of the mechanisms of synaptopathy and demyelination in the auditory periphery, and synaptic and myelin regeneration in sensorineural hearing loss.

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Funding

This work was supported by a GSK Japan Research Grant 2019 and a JSPS KAKENHI grant (Grant Number 19K24052) (both to T.K).

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TK designed the experiments. TK, SM, MT and TY performed the experiments and analyzed the data. TK wrote the manuscript. All authors reviewed the manuscript.

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Correspondence to Takaomi Kurioka.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving animals were in accordance with the ethical standards of the Ethics Committee of the Kitasato University School of Medicine (2019–085).

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Kurioka, T., Mogi, S., Tanaka, M. et al. Activity-Dependent Neurodegeneration and Neuroplasticity of Auditory Neurons Following Conductive Hearing Loss in Adult Mice. Cell Mol Neurobiol 41, 31–42 (2021). https://doi.org/10.1007/s10571-020-00829-y

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  • DOI: https://doi.org/10.1007/s10571-020-00829-y

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