Effect of hydrogen peroxide on potassium currents in inner hair cells isolated from guinea pig cochlea.

Abstract:

:Hydrogen peroxide (H₂O₂) is a ubiquitous reactive oxygen species that can induce several inner ear disorders. In this study, we recorded the potassium (K) currents in acutely isolated inner hair cells of guinea pig cochlea, and investigated the effects of H₂O₂. We also observed the morphological changes in inner hair cells induced by H₂O₂. In the H₂O₂ solutions, the amplitude of outward K currents (I(K,f) and I(K,s)) clearly decreased after perfusion for approximately 15 min. Despite the decrease in outward currents, small inward currents (I(K,n)) did not show any reduction. H₂O₂ induced morphological changes in the inner hair cells. All the inner hair cells in the H₂O₂ solutions showed shrinkage and granularity of the cell body and led to loss of viability. These results showed the vulnerability of inner hair cells to reactive oxygen species-induced inner ear disorders.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Kimitsuki T,Komune N,Noda T,Takaiwa K,Ohashi M,Komune S

doi

10.1097/WNR.0b013e32833fcb56

subject

Has Abstract

pub_date

2010-11-17 00:00:00

pages

1045-9

issue

16

eissn

0959-4965

issn

1473-558X

journal_volume

21

pub_type

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