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Ana Elgoyhen

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The efferent medial olivocochlear-hair cell synapse.

Ana Belén Elgoyhen; Eleonora Katz (Profiled Author: Ana Elgoyhen)

Instituto de Investigaciones en Ingeniería Genética y Biología Molecular, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. elgoyhen@dna.uba.ar
Journal of physiology, Paris 2012;106(1-2):47-56.

Abstract

Amplification of incoming sounds in the inner ear is modulated by an efferent pathway which travels back from the brain all the way to the cochlea. The medial olivocochlear system makes synaptic contacts with hair cells, where the neurotransmitter acetylcholine is released. Synaptic transmission is mediated by a unique nicotinic cholinergic receptor composed of α9 and α10 subunits, which is highly Ca2+ permeable and is coupled to a Ca2+-activated SK potassium channel. Thus, hyperpolarization of hair cells follows efferent fiber activation. In this work we review the literature that has enlightened our knowledge concerning the intimacies of this synapse.

Scientific Context

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