The effects of the antioxidant α-tocopherol succinate on cisplatin-induced ototoxicity in HEI-OC1 auditory cells

Sung Kyun Kim, Gi Jung Im, Yun Suk An, Se Hee Lee, Hak Hyun Jung, Sang Yoo Park

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24 Citations (Scopus)


Conclusion: D-α-tocopherol succinate significantly reduced a cisplatin-induced hair cell loss in HEI-OC1 cell lines. These effects were mediated by its scavenging activity against reactive oxygen species (ROS) and inhibition of apoptosis. Objectives: Alpha-tocopherol is a class of methylated phenols, known as fat-soluble antioxidants, and is a different form of vitamin E, which reduces free radicals and acts as an antioxidant. We hypothesized that the antioxidative effect of α-tocopherol could protect against cisplastin-induced cytotoxicity, and thus evaluated its effects on cisplatin-induced ototoxicity in HEI-OC1 auditory cells. Methods: HEI-OC1 cells were pretreated with D-α-tocopherol succinate at a concentration of 10 μM for 24 h, and then exposed to 15 μM cisplatin for 48 h. The cellular viability was measured by using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method. The intracellular ROS level was measured by using a fluorescent dye, 2',7'-dichlorofluorescein diacetate (DCFH-DA). Both Annexin V-FITC and propidium iodide (PI) staining were performed to analyze the pattern of apoptosis. The enzymatic activity of caspase-3 was assayed with caspase3/CPP32 fluorometric assay kit. Also, it was assessed by immunoblotting technique of poly-ADP-ribose polymerase (PARP). Results: Pretreatment with 10 μM D-α-tocopherol succinate protected HEI-OC1 auditory cells against cisplatin-induced cytotoxicity. D-α-tocopherol succinate significantly reduced the cisplatin-induced increase in ROS. D-α-tocopherol succinate treatment induced a 15% reduction of ROS and 50% decrease in necrosis and late apoptosis as compared to cisplatin treatment. D-α-tocopherol succinate also decreased the activation of caspase-3 and reduced levels of cleaved poly-ADP-ribose polymerase (PARP).

Original languageEnglish
Pages (from-to)9-14
Number of pages6
JournalInternational Journal of Pediatric Otorhinolaryngology
Publication statusPublished - 2016 Jul 1

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2014-071497 ; 2014R1A1A2053608 ), and the Korea University Grant ( K1220291 ).

Publisher Copyright:
© 2016 Elsevier Ireland Ltd.

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Otorhinolaryngology


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