Perilymph Osmolality Modulates Cochlear Function

Objectives/Hypothesis: The cochlear amplifier is required for the exquisite sensitivity of mammalian hearing. Outer hair cells underlie the cochlear amplifier and they are unique in that they maintain an intracellular turgor pressure. Changing the turgor pressure of an isolated outer hair cells thro...

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Veröffentlicht in:The Laryngoscope 2008-09, Vol.118 (9), p.1621-1629
Hauptverfasser: Choi, Chul-Hee, Oghalai, John S.
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Oghalai, John S.
description Objectives/Hypothesis: The cochlear amplifier is required for the exquisite sensitivity of mammalian hearing. Outer hair cells underlie the cochlear amplifier and they are unique in that they maintain an intracellular turgor pressure. Changing the turgor pressure of an isolated outer hair cells through osmotic challenge modulates its ability to produce electromotile force. We sought to determine the effect of osmotic challenge on cochlear function. Study Design: In vivo animal study. Methods: Hypotonic and hypertonic artificial perilymph was perfused through the scala tympani of anesthetized guinea pigs. Cochlear function was assessed by measuring the compound action potential, distortion product otoacoustic emissions, the cochlear microphonic, and the endocochlear potential. Results: Hypotonic perilymph decreased and hypertonic perilymph increased compound action potential and distortion product otoacoustic emission thresholds in a dose‐dependent and reversible manner. The cochlear microphonic quadratic distortion product magnitude increased after hypotonic perfusion and decreased with hypertonic perfusion. There were no changes in the stimulus intensity growth curve of the low‐frequency cochlear microphonic. The endocochlear potential was not affected by perilymph osmolality. Conclusions: These data demonstrate that perilymph osmolality can modulate cochlear function and are consistent with what would be expected if outer hair cells turgor pressure changes the gain of the cochlear amplifier in vivo.
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Outer hair cells underlie the cochlear amplifier and they are unique in that they maintain an intracellular turgor pressure. Changing the turgor pressure of an isolated outer hair cells through osmotic challenge modulates its ability to produce electromotile force. We sought to determine the effect of osmotic challenge on cochlear function. Study Design: In vivo animal study. Methods: Hypotonic and hypertonic artificial perilymph was perfused through the scala tympani of anesthetized guinea pigs. Cochlear function was assessed by measuring the compound action potential, distortion product otoacoustic emissions, the cochlear microphonic, and the endocochlear potential. Results: Hypotonic perilymph decreased and hypertonic perilymph increased compound action potential and distortion product otoacoustic emission thresholds in a dose‐dependent and reversible manner. The cochlear microphonic quadratic distortion product magnitude increased after hypotonic perfusion and decreased with hypertonic perfusion. There were no changes in the stimulus intensity growth curve of the low‐frequency cochlear microphonic. The endocochlear potential was not affected by perilymph osmolality. Conclusions: These data demonstrate that perilymph osmolality can modulate cochlear function and are consistent with what would be expected if outer hair cells turgor pressure changes the gain of the cochlear amplifier in vivo.</description><identifier>ISSN: 0023-852X</identifier><identifier>EISSN: 1531-4995</identifier><identifier>DOI: 10.1097/MLG.0b013e3181788d72</identifier><identifier>PMID: 18607303</identifier><identifier>CODEN: LARYA8</identifier><language>eng</language><publisher>Hoboken, NJ: John Wiley &amp; Sons, Inc</publisher><subject>Animals ; Audiometry, Evoked Response ; Biological and medical sciences ; Cochlea ; Cochlea - physiology ; cochlear amplifier ; Cochlear Microphonic Potentials ; electromotility ; Female ; Guinea Pigs ; hearing ; Male ; Medical sciences ; Osmolar Concentration ; Otoacoustic Emissions, Spontaneous ; Otorhinolaryngology. 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Outer hair cells underlie the cochlear amplifier and they are unique in that they maintain an intracellular turgor pressure. Changing the turgor pressure of an isolated outer hair cells through osmotic challenge modulates its ability to produce electromotile force. We sought to determine the effect of osmotic challenge on cochlear function. Study Design: In vivo animal study. Methods: Hypotonic and hypertonic artificial perilymph was perfused through the scala tympani of anesthetized guinea pigs. Cochlear function was assessed by measuring the compound action potential, distortion product otoacoustic emissions, the cochlear microphonic, and the endocochlear potential. Results: Hypotonic perilymph decreased and hypertonic perilymph increased compound action potential and distortion product otoacoustic emission thresholds in a dose‐dependent and reversible manner. The cochlear microphonic quadratic distortion product magnitude increased after hypotonic perfusion and decreased with hypertonic perfusion. There were no changes in the stimulus intensity growth curve of the low‐frequency cochlear microphonic. The endocochlear potential was not affected by perilymph osmolality. 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Stomatology</topic><topic>outer hair cell</topic><topic>Perfusion</topic><topic>Perilymph - physiology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Choi, Chul-Hee</creatorcontrib><creatorcontrib>Oghalai, John S.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>The Laryngoscope</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Choi, Chul-Hee</au><au>Oghalai, John S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Perilymph Osmolality Modulates Cochlear Function</atitle><jtitle>The Laryngoscope</jtitle><addtitle>The Laryngoscope</addtitle><date>2008-09</date><risdate>2008</risdate><volume>118</volume><issue>9</issue><spage>1621</spage><epage>1629</epage><pages>1621-1629</pages><issn>0023-852X</issn><eissn>1531-4995</eissn><coden>LARYA8</coden><abstract>Objectives/Hypothesis: The cochlear amplifier is required for the exquisite sensitivity of mammalian hearing. 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The cochlear microphonic quadratic distortion product magnitude increased after hypotonic perfusion and decreased with hypertonic perfusion. There were no changes in the stimulus intensity growth curve of the low‐frequency cochlear microphonic. The endocochlear potential was not affected by perilymph osmolality. Conclusions: These data demonstrate that perilymph osmolality can modulate cochlear function and are consistent with what would be expected if outer hair cells turgor pressure changes the gain of the cochlear amplifier in vivo.</abstract><cop>Hoboken, NJ</cop><pub>John Wiley &amp; Sons, Inc</pub><pmid>18607303</pmid><doi>10.1097/MLG.0b013e3181788d72</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects Animals
Audiometry, Evoked Response
Biological and medical sciences
Cochlea
Cochlea - physiology
cochlear amplifier
Cochlear Microphonic Potentials
electromotility
Female
Guinea Pigs
hearing
Male
Medical sciences
Osmolar Concentration
Otoacoustic Emissions, Spontaneous
Otorhinolaryngology. Stomatology
outer hair cell
Perfusion
Perilymph - physiology
title Perilymph Osmolality Modulates Cochlear Function
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