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22 February 2024 Spatiotemporal expression of FGF5 in chick inner ear neurons
Rhiannon Jones, Jennifer Rowsell
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Abstract

The inner ear is home to the auditory and vestibular systems, which are responsible for interpreting sound and movement. The auditory system contains the cochlea, and the vestibular system contains the saccule, utricle, and semicircular canals. Epithelial tissues within these organs consist of innervated hair cells that are responsible for processing stimuli. The precise development of these tissues is vital for their function. The Fibroblast Growth Factor (FGF) family and FGF signaling has been known to contribute to many developmental processes. Previous research demonstrated that FGF5 may contribute to neuron development in the inner ear. To explore whether FGF5 might play a role in inner ear neuron development, we characterized the spatiotemporal expression pattern of FGF5 in chick auditory and vestibular neurons, by performing immunohistochemistry from E3-E6.5, at every half day. The observed FGF5 expression was compared to neuronal labels NeuroD1, GATA3, and TuJ1. At E3-4.5, FG5 labeled a subset of cells within the TuJ1 labeled cells, and this population was NeuroD1 negative. At E5 and E6.5, FGF5 labeling continued to follow the TuJ1 pattern. These data suggest that FGF5 does not play a role in neuron proliferation, as NeuroD1 and FGF5 positive populations did not align. The GATA3 and FGF5 populations did align for the cochlear ganglion, therefore FGF5 could contribute to the differentiation of cochlear and vestibular neurons. The results of this study provide foundation for future studies aiming to further pre-existing remedies for auditory and vestibular disorders.

Rhiannon Jones and Jennifer Rowsell "Spatiotemporal expression of FGF5 in chick inner ear neurons," BIOS 95(1), 13-18, (22 February 2024). https://doi.org/10.1893/BIOS-D-23-00001
Received: 5 January 2023; Accepted: 20 June 2023; Published: 22 February 2024
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