Inhaled hydrogen gas therapy for prevention of noise-induced hearing loss through reducing reactive oxygen species

Akihiro Shiotani, Katsuki Niwa, Takaomi Kurioka, Takeshi Matsunobu, Yasushi Satoh

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DOI: 10.1016/j.neures.2014.08.009 DOI is the universal ID for this study.

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Reactive oxygen species (ROS) that form in the inner ear play an important role in noise-induced hearing loss (NIHL). Recent studies have revealed that molecular hydrogen (H2) has great potential for reducing ROS. In this study, we examined the potential of hydrogen gas to protect against NIHL. We tested this hypothesis in guinea pigs with 0.5%, 1.0% and 1.5% H2 inhalation in air for 5h a day after noise exposure, for five consecutive days. All animals underwent measurements for auditory brainstem response after the noise exposure; the results revealed that there was a better improvement in the threshold shift for the 1.0% and 1.5% H2-treated groups than the non-treated group. Furthermore, outer hair cell (OHC) loss was examined 7 days after noise exposure. A significantly higher survival rate of OHCs was observed in the 1.0% and 1.5% H2-treated group as compared to that of the non-treated group in the basal turn. Immunohistochemical analyses for 8-hydroxy-2'-deoxyguanosine (8-OHdG) were performed to examine the amount of oxidative DNA damage. While strong immunoreactivities against 8-OHdG were observed of the non-treated group, the H2-treated group showed decreased immunoreactivity for 8-OHdG. These findings strongly suggest that inhaled hydrogen gas protects against NIHL.

Publish Year 2014
Country Japan
Rank Positive
Journal Neuroscience Research
Primary Topic Ear
Secondary TopicHearing Loss
Model Guinea Pig
Tertiary TopicNoise Pollution
Vehicle Gas
pH N/A
Application Inhalation