Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.

Mammalian hearing relies on a cochlear hydrodynamic sensor embodied in the inner hair cell stereocilia bundle. It is presumed that acoustical stimuli induce a fluid shear-driven motion between the tectorial membrane and the reticular lamina to deflect the bundle. It is hypothesized that ion channels...

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Autores principales:	Sonya T Smith, Richard S Chadwick
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5cc89c36559249db823d6e51877fff39
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spelling	oai:doaj.org-article:5cc89c36559249db823d6e51877fff392021-11-18T06:56:26ZSimulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.1932-620310.1371/journal.pone.0018161https://doaj.org/article/5cc89c36559249db823d6e51877fff392011-03-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21483823/?tool=EBIhttps://doaj.org/toc/1932-6203Mammalian hearing relies on a cochlear hydrodynamic sensor embodied in the inner hair cell stereocilia bundle. It is presumed that acoustical stimuli induce a fluid shear-driven motion between the tectorial membrane and the reticular lamina to deflect the bundle. It is hypothesized that ion channels are opened by molecular gates that sense tension in tip-links, which connect adjacent stepped rows of stereocilia. Yet almost nothing is known about how the fluid and bundle interact. Here we show using our microfluidics model how each row of stereocilia and their associated tip links and gates move in response to an acoustical input that induces an orbital motion of the reticular lamina. The model confirms the crucial role of the positioning of the tectorial membrane in hearing, and explains how this membrane amplifies and synchronizes the timing of peak tension in the tip links. Both stereocilia rotation and length change are needed for synchronization of peak tip link tension. Stereocilia length change occurs in response to accelerations perpendicular to the oscillatory fluid shear flow. Simulations indicate that nanovortices form between rows to facilitate diffusion of ions into channels, showing how nature has devised a way to solve the diffusive mixing problem that persists in engineered microfluidic devices.Sonya T SmithRichard S ChadwickPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 3, p e18161 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sonya T Smith Richard S Chadwick Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.
description	Mammalian hearing relies on a cochlear hydrodynamic sensor embodied in the inner hair cell stereocilia bundle. It is presumed that acoustical stimuli induce a fluid shear-driven motion between the tectorial membrane and the reticular lamina to deflect the bundle. It is hypothesized that ion channels are opened by molecular gates that sense tension in tip-links, which connect adjacent stepped rows of stereocilia. Yet almost nothing is known about how the fluid and bundle interact. Here we show using our microfluidics model how each row of stereocilia and their associated tip links and gates move in response to an acoustical input that induces an orbital motion of the reticular lamina. The model confirms the crucial role of the positioning of the tectorial membrane in hearing, and explains how this membrane amplifies and synchronizes the timing of peak tension in the tip links. Both stereocilia rotation and length change are needed for synchronization of peak tip link tension. Stereocilia length change occurs in response to accelerations perpendicular to the oscillatory fluid shear flow. Simulations indicate that nanovortices form between rows to facilitate diffusion of ions into channels, showing how nature has devised a way to solve the diffusive mixing problem that persists in engineered microfluidic devices.
format	article
author	Sonya T Smith Richard S Chadwick
author_facet	Sonya T Smith Richard S Chadwick
author_sort	Sonya T Smith
title	Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.
title_short	Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.
title_full	Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.
title_fullStr	Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.
title_full_unstemmed	Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.
title_sort	simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/5cc89c36559249db823d6e51877fff39
work_keys_str_mv	AT sonyatsmith simulationoftheresponseoftheinnerhaircellstereociliabundletoanacousticalstimulus AT richardschadwick simulationoftheresponseoftheinnerhaircellstereociliabundletoanacousticalstimulus
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Simulation of the response of the inner hair cell stereocilia bundle to an acoustical stimulus.

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