Perilymph osmolality modulates cochlear function.

Perilymph osmolality modulates cochlear function. Research Abstract Details 

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Perilymph osmolality modulates cochlear function. Abstract Text:

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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Perilymph osmolality modulates cochlear function. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The Laryngoscope

VOLUME: 118

Page Numbers: 1621-9

Journal Abbreviation: Laryngoscope

ISSN: 1531-4995

DAY: 3

MONTH: Sep

YEAR: 2008

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LANGUAGE: eng

NlmUniqueID: 8607378

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Grant and Affiliation Information for Perilymph osmolality modulates cochlear function.

AFFILIATION: The Bobby R. Alford Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, Texas 77030, USA.

Country: United States

AGENCY: United States NIDCD

GRANT: DC05131

ACRONYM: DC

MEDLINETA: Laryngoscope

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