Dibenzazepine promotes cochlear supporting cell proliferation and hair cell regeneration in neonatal mice

Cell Proliferation
Jingfang WuHuawei Li

Abstract

To investigate the role of dibenzazepine (DBZ) in promoting supporting cell (SC) proliferation and hair cell (HC) regeneration in the inner ear. Postnatal day 1 wild-type or neomycin-damaged mouse cochleae were cultured with DBZ. Immunohistochemistry and scanning electron microscopy were used to examine the morphology of cochlear cells, and high-throughput RNA-sequencing was used to measure gene expression levels. We found that DBZ promoted SC proliferation and HC regeneration in a dose-dependent manner in both normal and damaged cochleae. In addition, most of the newly regenerated HCs induced by DBZ had visible and relatively mature stereocilia bundle structures. Finally, RNA sequencing detected the differentially expressed genes between DBZ treatment and controls, and interaction networks were constructed for the most highly differentially expressed genes. Our study demonstrates that DBZ can significantly promote SC proliferation and increase the number of mitotically regenerated HCs with relatively mature stereocilia bundles in the neonatal mouse cochlea by inhibiting Notch signalling and activating Wnt signalling, suggesting the DBZ might be a new therapeutic target for stimulating HC regeneration.

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Citations

Sep 14, 2021·ACS Applied Materials & Interfaces·Hadi AhmadiMohsen Asadnia

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Methods Mentioned

BETA
PCR
transgenic

Software Mentioned

ImageJ
GraphPad Prism
STRING
DESeq2

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