Document Detail


Effect of hydrogen peroxide on potassium currents in inner hair cells isolated from guinea pig cochlea.
MedLine Citation:
PMID:  20856150     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
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.
Authors:
Takashi Kimitsuki; Noritaka Komune; Teppei Noda; Kazutaka Takaiwa; Mitsuru Ohashi; Shizuo Komune
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroreport     Volume:  21     ISSN:  1473-558X     ISO Abbreviation:  Neuroreport     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9100935     Medline TA:  Neuroreport     Country:  England    
Other Details:
Languages:  eng     Pagination:  1045-9     Citation Subset:  IM    
Affiliation:
Department of Otolaryngology, Graduate School of Medical Sciences, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
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