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The auditory nerve (AN) of the inner ear is the primary conveyor of acoustic information from sensory hair cells to the brainstem. Approximately 95% of peripheral AN fibers are myelinated by glial cells. The integrity of myelin and the glial-associated paranodal structures at the node of Ranvier is critical for normal AN activity and axonal survival and function in the central auditory nervous system. However, little is known about the node of Ranvier's spatiotemporal development in the AN, how the aging process (or injury) affects the activity of myelinating glial cells, and how downstream alterations in myelin and paranodal structure contribute to AN degeneration and sensorineural hearing loss. Here, we characterized two types of Ranvier nodes-the axonal node and the ganglion node-in the mouse peripheral AN, and found that they are distinct in several features of postnatal myelination and age-related degeneration. Cellular, molecular, and structure-function correlations revealed that the two node types are each critical for different aspects of peripheral AN function. Neural processing speed and synchrony is associated with the length of the axonal node, while stimulus level-dependent amplitude growth and action potentials are associated with the ganglion node. Moreover, our data indicate that dysregulation of glial cells (e.g., satellite cells) and degeneration of the ganglion node structure are an important new mechanism of age-related hearing loss.
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