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Journal of the Association for Research in Otolaryngology
Published in: Journal of the Association for Research in Otolaryngology 4/2016

01-08-2016 | Research Article

Inhibitors of Histone Deacetylases Attenuate Noise-Induced Hearing Loss

Authors: Jun Chen, Kayla Hill, Su-Hua Sha

Published in: Journal of the Association for Research in Otolaryngology | Issue 4/2016

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Abstract

Loss of auditory sensory hair cells is the major pathological feature of noise-induced hearing loss (NIHL). Currently, no established clinical therapies for prevention or amelioration of NIHL are available. The absence of treatments is due to our lack of a comprehensive understanding of the molecular mechanisms underlying noise-induced damage. Our previous study indicates that epigenetic modification of histones alters hair cell survival. In this study, we investigated the effect of noise exposure on histone H3 lysine 9 acetylation (H3K9ac) in the inner ear of adult CBA/J mice and determined if inhibition of histone deacetylases by systemic administration of suberoylanilide hydroxamic acid (SAHA) could attenuate NIHL. Our results showed that H3K9ac was decreased in the nuclei of outer hair cells (OHCs) and marginal cells of the stria vascularis in the basal region after exposure to a traumatic noise paradigm known to induce permanent threshold shifts (PTS). Consistent with these results, levels of histone deacetylases 1, 2, and 3 (HDAC1, HDAC2 and HDAC3) were increased predominately in the nuclei of cochlear cells. Silencing of HDAC1, HDAC2, or HDAC3 with siRNA reduced the expression of the target HDAC in OHCs, but did not attenuate noise-induced PTS, whereas treatment with the pan-HDAC inhibitor SAHA, also named vorinostat, reduced OHC loss, and attenuated PTS. These findings suggest that histone acetylation is involved in the pathogenesis of noise-induced OHC death and hearing loss. Pharmacological targeting of histone deacetylases may afford a strategy for protection against NIHL.
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Metadata
Title
Inhibitors of Histone Deacetylases Attenuate Noise-Induced Hearing Loss
Authors
Jun Chen
Kayla Hill
Su-Hua Sha
Publication date
01-08-2016
Publisher
Springer US
Published in
Journal of the Association for Research in Otolaryngology / Issue 4/2016
Print ISSN: 1525-3961
Electronic ISSN: 1438-7573
DOI
https://doi.org/10.1007/s10162-016-0567-7

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