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The Effects of the Antioxidant α-tocopherol Succinate on Cisplatin-Induced Ototoxicity in HEI-OC1 Auditory Cells

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

Int J Pediatr Otorhinolaryngol. 2016 Jul;86:9-14.

PMID: 27260571

Abstract:

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).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP4345033-B	D-α-Tocopherol succinate		4345-03-3	Price

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