1 Ocak 2021 Dergi makalesi Açık Erişim

Guven, Selis Gulseven; Ersoy, Onur; Topuz, Ruhan Deniz; Bulut, Erdogan; Kizilay, Gulnur; Uzun, Cem

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    <subfield code="a">Does Oral Monosodium Glutamate Have a Cochleotoxic Effect? An Experimental Study</subfield>
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    <subfield code="a">Guven, Selis Gulseven</subfield>
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    <subfield code="a">Introduction: The effect of orally consumed monosodium glutamate (MSG), which is a common additive in the food industry, on the cochlea has not been investigated. The present study aimed to investigate the possible cochleotoxic effects of oral MSG in guinea pigs using electrophysiological, biochemical, and histopathological methods. Methods: Thirty guinea pigs were equally divided into control and intervention groups (MSG 100 mg/kg/day; MSG 300 mg/kg/day). At 1 month, 5 guinea pigs from each group were sacrificed; the rest were observed for another month. Electrophysiological measurements (distortion product otoacoustic emission [DPOAE] and auditory brainstem response [ABR]), glutamate levels in the perilymph and blood samples, and histopathological examinations were evaluated at 1 and 2 months. Results: Change in signal-to-noise ratio at 2 months was significantly different in the MSG 300 group at 0.75 kHz and 2 kHz (p = 0.013 and p = 0.044, respectively). There was no statistically significant difference in ABR wave latencies of the guinea pigs given MSG compared to the control group after 1 and 2 months; an increase was noted in ABR thresholds, although the difference was not statistically significant. In the MSG groups, moderate-to-severe degeneration and cell loss in outer hair cells, support cells, and spiral ganglia, lateral surface junction irregularities, adhesions in stereocilia, and partial loss of outer hair cell stereocilia were noted. Conclusion: MSG, administered in guinea pigs at a commonly utilized quantity and route of administration in humans, may be cochleotoxic.</subfield>
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