Protective mechanisms of avocado oil extract against ototoxicity

Thu Nguyen Minh Pham, Seo Yeon Jeong, Do Hoon Kim, Yu Hwa Park, Jung Suk Lee, Kye Wan Lee, In Seok Moon, Se Young Choung, Seung Hyun Kim, Tong Ho Kang, Kwang Won Jeong

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Despite the excellent antimicrobial activity of aminoglycoside antibiotics, permanent inner ear damage associated with the use of these drugs has resulted in the need to develop strategies to address the ototoxic risk given their widespread use. In a previous study, we showed that avocado oil protects ear hair cells from damage caused by neomycin. However, the detailed mechanism by which this protection occurs is still unclear. Here, we investigated the auditory cell-protective mechanism of enhanced functional avocado oil extract (DKB122). RNA sequencing followed by pathway analysis revealed that DKB122 has the potential to enhance the expression of detoxification and antioxidant genes associated with glutathione metabolism (Hmox4, Gsta4, Mgst1, and Abcc3) in HEI-OC1 cells. Additionally, DKB122 effectively decreased ROS levels, resulting in the inhibition of apoptosis in HEI-OC1 cells. The expression of the inflammatory genes that encode chemokines and interleukins was also downregulated by DKB122 treatment. Consistent with these results, DKB122 significantly inhibited p65 nuclear migration induced by TNF-α or LPS in HEI-OC1 cells and THP-1 cells and the expression of inflammatory chemokine and interleukin genes induced by TNF-α was significantly reduced. Moreover, DKB122 treatment increased LC3-II and decreased p62 in HEI-OC1 cells, suggesting that DKB122 increases autophagic flux. These results suggest that DKB122 has otoprotective effects attributable to its antioxidant activity, induction of antioxidant gene expression, anti-inflammatory activity, and autophagy activation.

Original languageEnglish
Article number947
Issue number4
Publication statusPublished - 2020 Apr

Bibliographical note

Funding Information:
Funding: This work was supported by the Technology Innovation Program (10080691), funded by the Ministry of Trade, Industry and Energy (MOTIE, Republic of Korea).

Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Food Science
  • Nutrition and Dietetics


Dive into the research topics of 'Protective mechanisms of avocado oil extract against ototoxicity'. Together they form a unique fingerprint.

Cite this