Serkan YILDIRIM, Korhan KILIÇ, Muhammed Sedat SAKAT, Abdulkadir ŞAHİN, Abdulbaki SÖKMEN

Protective effect of thymol and coenzyme Q10 administered in two different doses against gentamycin-induced ototoxicity in rats

Aim: Aminoglycoside group drugs are widely used due to their broad spectrum and low cost. Clinical or subclinical nephrotoxicityand ototoxicity may frequently be seen as side-effects. The purpose of the present study was to investigate the protective efficacyof thymol and coenzyme Q10 in a gentamycin-induced ototoxicity model in rats.Materials and Methods: Thirty-six female Sprague-Dawley rats were divided into six groups of six animals each. The first grouprepresented the control animals. The second group was exposed to ototoxicity induced by intraperitoneal (i.p.) gentamycinadministration at 80 mg/kg for seven days. The third group received oral thymol at 10 mg/kg simultaneously with 80 mg/kg gentamycin. The fourth group received 20 mg/kg oral thymol simultaneously with i.p. 80 mg/kg gentamycin. The fifth groupreceived 10 mg/kg coenzyme Q10 simultaneously with i.p. 80 mg/kg gentamycin, and the sixth group received 20 mg/kg coenzymeQ10 simultaneously with i.p. 80 mg/kg gentamycin. All animals were sacrificed by decapitation under anesthesia at the end ofthe seventh day. The temporal region was extracted en bloc, and cochlear structures were subjected to histopathological andimmunohistochemical examination.Results: Immunohistochemical and histopathological analyses showed that thymol and coenzyme Q10 administered at dosagesof 10 mg/kg and 20 mg/kg reduced such effects as hyperemia in the stria vascularis, decreases in inner hair cell numbers, anddegeneration in spinal ganglion cells, and produced a decrease in caspase-3 activity. Significantly better results were obtained withhigh-dose treatments compared to the low-dose groups. The protective efficacy of coenzyme Q10 applied at a dose of 20 mg/kgwas particularly marked compared with the ototoxicity group.Conclusion: Coenzyme Q10 and thymol exhibited marked protective effects against ototoxicity induced in rats. Coenzyme Q10and thymol are two important antioxidant substances with the potential for use in preventing side-effects that may develop inassociation with gentamycin use.

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