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• W2107931459 abstract "Noise-induced hearing loss is at least in part due to disruption of endocochlear potential, which is maintained by various K+ transport apparatuses including Na+, K+-ATPase and gap junction-mediated intercellular communication in the lateral wall structures. In this study, we examined the changes in the ion-trafficking-related proteins in the spiral ligament fibrocytes (SLFs) following in vivo acoustic overstimulation or in vitro exposure of cultured SLFs to 4-hydroxy-2-nonenal, which is a mediator of oxidative stress. Connexin (Cx)26 and Cx30 were ubiquitously expressed throughout the spiral ligament, whereas Na+, K+-ATPase α1 was predominantly detected in the stria vascularis and spiral prominence (type 2 SLFs). One-hour exposure of mice to 8 kHz octave band noise at a 110 dB sound pressure level produced an immediate and prolonged decrease in the Cx26 expression level and in Na+, K+-ATPase activity, as well as a delayed decrease in Cx30 expression in the SLFs. The noise-induced hearing loss and decrease in the Cx26 protein level and Na+, K+-ATPase activity were abolished by a systemic treatment with a free radical-scavenging agent, 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl, or with a nitric oxide synthase inhibitor, Nω-nitro-L-arginine methyl ester hydrochloride. In vitro exposure of SLFs in primary culture to 4-hydroxy-2-nonenal produced a decrease in the protein levels of Cx26 and Na+, K+-ATPase α1, as well as Na+, K+-ATPase activity, and also resulted in dysfunction of the intercellular communication between the SLFs. Taken together, our data suggest that disruption of the ion-trafficking system in the cochlear SLFs is caused by the decrease in Cxs level and Na+, K+-ATPase activity, and at least in part involved in permanent hearing loss induced by intense noise. Oxidative stress-mediated products might contribute to the decrease in Cxs content and Na+, K+-ATPase activity in the cochlear lateral wall structures." @default.
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• W2107931459 date "2014-07-11" @default.
• W2107931459 modified "2023-09-23" @default.
• W2107931459 title "Disruption of Ion-Trafficking System in the Cochlear Spiral Ligament Prior to Permanent Hearing Loss Induced by Exposure to Intense Noise: Possible Involvement of 4-Hydroxy-2-Nonenal as a Mediator of Oxidative Stress" @default.
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• W2107931459 doi "https://doi.org/10.1371/journal.pone.0102133" @default.
• W2107931459 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4094500" @default.
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