The efferent medial olivocochlear-hair cell synapse

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• 作者：Ana Belé ; n Elgoyhen^a ; ^b ; ^{elgoyhen@dna.uba.ar} ; ^{abelgoyhen@gmail.com} ; Eleonora Katz^a ; ^c
• 关键词：Hair cells ; Nicotinic receptors ; ¦Á9 and ¦Á10 Nicotinic receptors ; Synaptic plasticity ; Prestin ; Cochlea ; SK channels
• 刊名：Journal of Physiology-Paris
• 出版年：2012
• 出版时间：January-April, 2012
• 年：2012
• 卷：106
• 期：1-2
• 页码：47-56
• 全文大小：806 K

文摘

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 ¦Á9 and ¦Á10 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.