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The protective effect of metformin against the noise-induced hearing loss

  • Otology
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European Archives of Oto-Rhino-Laryngology Aims and scope Submit manuscript

Abstract

Objective

To test the protective effect of metformin against noise-induced hearing loss.

Methods

24 rats were included in the study. The first group was exposed to noise only, the second group took metformin, the third group was exposed to noise and took metformin, and the fourth group was neither exposed to noise nor took metformin as control group. After measurement of baseline DPOAE and ABR of rats, the metformin group and the metformin + noise group received 300 mg/kg/day metformin via gavage for 10 days. On the 11th day, group 1 and group 3 were exposured to white noise at 105 dB SPL for 15 h. After noise exposure, DPOAE and ABR measurements of all rats were repeated on days 1st, 7th, and 21st. At the end of the study, all animals were sacrificed and cochlear tissues were separated for immunohistochemical assessments.

Results

ABR threshold values and DPAOE measurements of groups 1 and 3 were deteriorated on the 1st day after noise, while deterioration in group 1 continued on 7th and 21st days, but normalized on 7th day in group 3. After immune staining, a significant immunoreaction was observed in the noise group, while the reaction in the noise + metformin group was close to the control group.

Conclusion

Metformin has a protective effect on noise-induced hearing loss in rats. As a conclusion, it is determined that metformin protects from permanent threshold shift in rats. It can be considered a good alternative for protecting noise-induced hearing loss.

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Acknowledgements

This study was approved by the Medical and Health Sciences Research Council of our university (Project number: DA16/26).

Funding

There is no financial support used for this study.

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Correspondence to Gülin Gökçen Kesici.

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The authors declare that they have no conflict of interest.

Ethical approval

All applicable international, national, and institutional guidelines for the care and use of animals were followed in the study. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. This study was approved by the institutional ethics committee.

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Kesici, G.G., Öcal, F.C.A., Gürgen, S.G. et al. The protective effect of metformin against the noise-induced hearing loss. Eur Arch Otorhinolaryngol 275, 2957–2966 (2018). https://doi.org/10.1007/s00405-018-5161-7

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  • DOI: https://doi.org/10.1007/s00405-018-5161-7

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