Abstract
Transduction of sound stimuli into nerve impulses in the cochlea begins with an initial passive mechanical stage, the energy for which comes from the sound stimulus itself. In the normal cochlea, this passive event initiates active components of transduction, the energy for which comes from energy metabolism, and involves creation and maintenance of electrochemical gradients. These gradients must be maintained to enable continued transduction. This metabolic activity leads to the release of reactive oxygen species (ROS) and other free radicals, which, in the course of transduction of conventional sound intensities, is balanced by the endogenous antioxidant compounds present in the cochlear tissues. However, during acoustic overstimulation, the elevated levels of the highly reactive ROS molecules produced exceed the inherent levels of antioxidants present in the tissue, and this can lead to structural damage in the cochlea, with cell death and hearing loss. It has been suggested that such mechanisms are also involved in the hearing loss caused by ototoxic drugs and by aging (presbyacusis). Several strategies can be used to reduce the resulting hearing loss, whether induced by noise exposure, by ototoxic drugs, or by aging. These approaches include induction of elevated levels of endogenous antioxidants in the cochlea, before the noise exposure. Exogenous antioxidant drugs can also be administered before the exposure. An additional therapeutic strategy involves “rescue” by administering antioxidant drugs after the noise exposure. These therapeutic strategies are reviewed and evaluated.
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Sohmer, H., Adelman, C. (2011). Radicals Attack the Ear The Toll: A Loss of Hearing. In: Gadoth, N., Göbel, H. (eds) Oxidative Stress and Free Radical Damage in Neurology. Oxidative Stress in Applied Basic Research and Clinical Practice. Humana Press. https://doi.org/10.1007/978-1-60327-514-9_14
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