TY - JOUR
T1 - Canonical Notch signaling plays an instructive role in auditory supporting cell development
AU - Campbell, Dean P.
AU - Chrysostomou, Elena
AU - Doetzlhofer, Angelika
N1 - Funding Information:
This work was supported by National Institutes of Health grants DC011571 (A.D), T32GM007445 (D.P.C) and DC005211 (Sensory Mechanisms Research Core Center). The authors would like to thank the members of the Doetzlhofer Lab and Center for Sensory Biology for the help and advice provided throughout the course of this study. We also thank Dr. Randall Reed for discussions and careful reading of the manuscript.
PY - 2016/1/20
Y1 - 2016/1/20
N2 - 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 (Emx2Cre/+; Rosa26N1ICD/+) and loss-of-function approaches (Emx2Cre/+; Rosa26DnMAML1/+). Furthermore, we demonstrate that Notch over-activation in the differentiating murine cochlea (Emx2Cre/+; Rosa26N1ICD/+) actively promotes a SC-specific gene expression program. Finally, we show that outer SCs-so called Deiters' cells are selectively lost by prolonged reduction (Emx2Cre/+; Rosa26DnMAML1/+/+) or abolishment of canonical Notch signaling (Fgfr3-iCreER; Rbpj-/δ), indicating a critical role for Notch signaling in Deiters' cell development.
AB - 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 (Emx2Cre/+; Rosa26N1ICD/+) and loss-of-function approaches (Emx2Cre/+; Rosa26DnMAML1/+). Furthermore, we demonstrate that Notch over-activation in the differentiating murine cochlea (Emx2Cre/+; Rosa26N1ICD/+) actively promotes a SC-specific gene expression program. Finally, we show that outer SCs-so called Deiters' cells are selectively lost by prolonged reduction (Emx2Cre/+; Rosa26DnMAML1/+/+) or abolishment of canonical Notch signaling (Fgfr3-iCreER; Rbpj-/δ), indicating a critical role for Notch signaling in Deiters' cell development.
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U2 - 10.1038/srep19484
DO - 10.1038/srep19484
M3 - Article
C2 - 26786414
AN - SCOPUS:84955248350
SN - 2045-2322
VL - 6
JO - Scientific reports
JF - Scientific reports
M1 - 19484
ER -