Canonical Notch signaling plays an instructive role in auditory supporting cell development

Scientific Reports
Dean P CampbellAngelika Doetzlhofer

Abstract

The auditory sensory epithelium, composed of mechano-sensory hair cells (HCs) and highly specialized glial-like supporting cells (SCs), is critical for our ability to detect sound. SCs provide structural and functional support to HCs and play an essential role in cochlear development, homeostasis and repair. Despite their importance, however, surprisingly little is known about the molecular mechanisms guiding SC differentiation. Here, we provide evidence that in addition to its well-characterized inhibitory function, canonical Notch signaling plays a positive, instructive role in the differentiation of SCs. Using γ-secretase inhibitor DAPT to acutely block canonical Notch signaling, we identified a cohort of Notch-regulated SC-specific genes, with diverse functions in cell signaling, cell differentiation, neuronal innervation and synaptogenesis. We validated the newly identified Notch-regulated genes in vivo using genetic gain (Emx2(Cre/+); Rosa26(N1ICD/+)) and loss-of-function approaches (Emx2(Cre/+); Rosa26(DnMAML1/+)). Furthermore, we demonstrate that Notch over-activation in the differentiating murine cochlea (Emx2(Cre/+); Rosa26(N1ICD/+)) actively promotes a SC-specific gene expression program. Finally, we show that outer ...Continue Reading

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Citations

Sep 17, 2013·PloS One·Vanessa de Oliveira-CarlosMichael Brand
May 22, 2018·Frontiers in Cellular Neuroscience·Melissa M McGovernBrandon C Cox
Jun 24, 2020·Development·Elizabeth Carroll Driver, Matthew W Kelley
Jun 22, 2020·Hearing Research·Seiji B ShibataRichard D Kopke
May 22, 2020·Current Stem Cell Research & Therapy·Tianxu ZhangRonghui Zhou

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