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C-phycocyanin from Limnothrix Species KNUA002 Alleviates Cisplatin-Induced Ototoxicity by Blocking the Mitochondrial Apoptotic Pathway in Auditory Cells

1,2,†, 1,2,†, 1,2,†, 1,2, 1,2, 1,2,* and 1,2,3,*
1
Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu 41566, Korea
2
School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu 41566, Korea
3
Advanced Bio-Resource Research Center, Kyungpook National University, Daegu 41566, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Mar. Drugs 2019, 17(4), 235; https://doi.org/10.3390/md17040235
Received: 21 February 2019 / Revised: 6 April 2019 / Accepted: 16 April 2019 / Published: 19 April 2019
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Abstract

Ototoxicity, or adverse pharmacological effects on the inner ear or auditory nerve, is a common side effect of cisplatin, a platinum-based drug widely used in anticancer chemotherapy. Although the incidence of ototoxicity is high among patients that receive cisplatin therapy, there is currently no effective treatment for it. The generation of excessive reactive oxygen species (ROS) is considered to be the major cause of cisplatin-induced ototoxicity. C-phycocyanin (C-PC), a blue phycobiliprotein found in cyanobacteria and red algae, has antioxidant and anticancer activities in different experimental models in vitro and in vivo. Thus, we tested the ability of C-PC from Limnothrix sp. KNUA002 to protect auditory cells from cisplatin-induced ototoxicity in vitro. Pretreatment with C-PC from Limnothrix sp. KNUA002 inhibited apoptosis and protected mitochondrial function by preventing ROS accumulation in cisplatin-treated House Ear Institute-Organ of Corti 1 (HEI-OC1) cells, a mouse auditory cell line. Cisplatin increased the expression of Bax and reduced the expression of Bcl-2, which activate and inhibit, respectively, the mitochondrial apoptotic pathway in response to oxidative stress. Pretreatment with C-PC prior to cisplatin treatment caused the Bax and Bcl-2 levels to stay close to the levels in untreated control cells. Our results suggest that C-PC from Limnothrix sp. KNUA002 protects cells against cisplatin-induced cytotoxicity by inhibiting the mitochondrial apoptotic pathway. View Full-Text
Keywords: ototoxicity; cisplatin; C-phycocyanin; Limnothrix; HEI-OC1 ototoxicity; cisplatin; C-phycocyanin; Limnothrix; HEI-OC1
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MDPI and ACS Style

Kim, Y.-R.; Do, J.-M.; Kim, K.H.; Stoica, A.R.; Jo, S.-W.; Kim, U.-K.; Yoon, H.-S. C-phycocyanin from Limnothrix Species KNUA002 Alleviates Cisplatin-Induced Ototoxicity by Blocking the Mitochondrial Apoptotic Pathway in Auditory Cells. Mar. Drugs 2019, 17, 235.

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