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Dose-dependent dual effect of melatonin on ototoxicity induced by amikacin in adult rats

  • Otology
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The aim of this animal study was to reveal the dose-dependent effects of melatonin on aminoglycoside ototoxicity by utilizing distortion product otoacoustic emissions (DPOAEs). Forty-four adult (aged 12 months) rats were divided into five groups. Rats of the control group (group C) were injected with vehicle, while the melatonin group (group M) received melatonin (4 mg/kg per day); there were four rats in each of these groups. The study groups consisted of 12 rats per group, and they were treated as follows: 600 mg/kg per day amikacin (group A), amikacin plus a low dose (0.4 mg/kg per day) melatonin (group AML) and amikacin plus high dose (4 mg/kg per day) melatonin (group AMH) for 14 days. During the serial measurements on days 0, 5, 10 and 15, the DPOAE results of groups C,M and AML were not significantly changed. Amikacin ototoxicity findings for input/output (I/O) functions were detected on the 3rd measurement of the study in group A. High-dose melatonin clearly enhanced and accelerated amikacin-induced ototoxicity. The DP-gram amplitudes and I/O amplitudes were reduced, and I/O thresholds were increased in group AMH. Group AMH was the group that was affected the most and earliest by amikacin. Our study results showed that while low-dose melatonin protected the inner ear from ototoxicity, high dose melatonin facilitated amikacin-induced ototoxicity, possibly via the vasodilatory effect, leading to an increased accumulation of amikacin in the inner ear. Probably, the protective effect of the melatonin at a dose of 0.4 mg/kg per day is related to its antioxidant properties. Apparently, the vasodilatory effect of melatonin seems to be more prominent than its antioxidant effect in high doses.

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Authors and Affiliations

  1. Department of Otorhinolaryngology, Inonu University Medical Faculty, 44300, Malatya, Turkey

    Tamer Erdem, Orhan Ozturan & Murat Cem Miman

  2. Department of Pharmacology, Inonu University Medical Faculty, Malatya, Turkey

    Mustafa Iraz & Ercument Olmez

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  1. Tamer Erdem
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  2. Orhan Ozturan
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Correspondence to Tamer Erdem.

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Erdem, T., Ozturan, O., Iraz, M. et al. Dose-dependent dual effect of melatonin on ototoxicity induced by amikacin in adult rats. Eur Arch Otorhinolaryngol 262, 314–321 (2005). https://doi.org/10.1007/s00405-004-0793-1

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