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The origin of spontaneous activity in the developing auditory system
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The origin of spontaneous activity in the developing auditory system
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Journal Article
The origin of spontaneous activity in the developing auditory system
2007
Overview
Spontaneous activity in the developing auditory system is required for neuronal survival as well as the refinement and maintenance of tonotopic maps in the brain. However, the mechanisms responsible for initiating auditory nerve firing in the absence of sound have not been determined. Here we show that supporting cells in the developing rat cochlea spontaneously release ATP, which causes nearby inner hair cells to depolarize and release glutamate, triggering discrete bursts of action potentials in primary auditory neurons. This endogenous, ATP-mediated signalling synchronizes the output of neighbouring inner hair cells, which may help refine tonotopic maps in the brain. Spontaneous ATP-dependent signalling rapidly subsides after the onset of hearing, thereby preventing this experience-independent activity from interfering with accurate encoding of sound. These data indicate that supporting cells in the organ of Corti initiate electrical activity in auditory nerves before hearing, pointing to an essential role for peripheral, non-sensory cells in the development of central auditory pathways.
Publisher
Nature Publishing,Nature Publishing Group
Subject
Action Potentials - drug effects
/ Adenosine Triphosphate - metabolism
/ Adenosine Triphosphate - pharmacology
/ Animals
/ ATP
/ Auditory Pathways - drug effects
/ Auditory Pathways - growth & development
/ Auditory Pathways - physiology
/ Auditory Perception - drug effects
/ Auditory Perception - physiology
/ Biological and medical sciences
/ Fundamental and applied biological sciences. Psychology
/ Hair
/ Hair Cells, Auditory - drug effects
/ Hair Cells, Auditory - metabolism
/ Hair Cells, Auditory - physiology
/ Rats
/ Rodents
