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High-throughput Screening on Cochlear Organoids Identifies VEGFR-MEK-TGFB1 Signaling Promoting Hair Cell Reprogramming

Overview
Publisher Cell Press
Specialty Cell Biology
Date 2021 Sep 15
PMID 34525385
Citations 11
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Abstract

Hair cell degeneration is a major cause of sensorineural hearing loss. Hair cells in mammalian cochlea do not spontaneously regenerate, posing a great challenge for restoration of hearing. Here, we establish a robust, high-throughput cochlear organoid platform that facilitates 3D expansion of cochlear progenitor cells and differentiation of hair cells in a temporally regulated manner. High-throughput screening of the FDA-approved drug library identified regorafenib, a VEGFR inhibitor, as a potent small molecule for hair cell differentiation. Regorafenib also promotes reprogramming and maturation of hair cells in both normal and neomycin-damaged cochlear explants. Mechanistically, inhibition of VEGFR suppresses TGFB1 expression via the MEK pathway and TGFB1 downregulation directly mediates the effect of regorafenib on hair cell reprogramming. Our study not only demonstrates the power of a cochlear organoid platform in high-throughput analyses of hair cell physiology but also highlights VEGFR-MEK-TGFB1 signaling crosstalk as a potential target for hair cell regeneration and hearing restoration.

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Metabolic Profiling of Cochlear Organoids Identifies α-Ketoglutarate and NAD as Limiting Factors for Hair Cell Reprogramming.

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Organoids-the key to novel therapies for the inner ear?.

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MEK/ERK signaling drives the transdifferentiation of supporting cells into functional hair cells by modulating the Notch pathway.

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