Dietary vitamin C supplementation reduces noise-induced hearing loss in guinea pigs
| Autor: | Jenifer M Woo, Nathan Michalak, Dalian Ding, Sandra L. McFadden |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Vitamin
medicine.medical_specialty Antioxidant medicine.medical_treatment Guinea Pigs Ascorbic Acid Antioxidants Guinea pig chemistry.chemical_compound Internal medicine Hair Cells Auditory otorhinolaryngologic diseases medicine Evoked Potentials Auditory Brain Stem Animals Cilia chemistry.chemical_classification Reactive oxygen species Analysis of Variance Vitamin C Auditory Threshold Glutathione Ascorbic acid medicine.disease Sensory Systems Diet Endocrinology chemistry Biochemistry Acoustic Stimulation Hearing Loss Noise-Induced Microscopy Electron Scanning Noise-induced hearing loss |
| Zdroj: | Hearing research. 202(1-2) |
| ISSN: | 0378-5955 |
| Popis: | Vitamin C (ascorbate) is a water-soluble, low molecular weight antioxidant that works in conjunction with glutathione and other cellular antioxidants, and is effective against a variety of reactive oxygen species, including superoxide and hydroxyl radicals that have been implicated in the etiology of noise-induced hearing loss (NIHL). Whereas most animals can manufacture their own vitamin C, humans and a few other mammals such as guinea pigs lack the terminal enzyme for vitamin C synthesis and must obtain it from dietary sources. To determine if susceptibility to NIHL could be influenced by manipulating dietary levels of vitamin C, albino guinea pigs were raised for 35 days on a diet with normal, supplemented or deficient levels of ascorbate, then exposed to 4 kHz octave band noise at 114 dB SPL for 6 h to induce permanent threshold shifts (PTS) of the scalp-recorded auditory brainstem response. Animals that received the highest levels of dietary ascorbate developed significantly less PTS for click stimuli and 4, 8, 12, and 16 kHz tones than animals on normal and deficient diets. Outer hair cell loss was minimal in all groups after noise exposure, but permanent damage to stereocilia were observed in noise-exposed ears. The results support the hypothesis that dietary factors influence individual susceptibility to hearing loss, and suggest that high levels of vitamin C may be beneficial in reducing susceptibility to NIHL. |
| Databáze: | OpenAIRE |
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