Mitochondrial calcium uptake underlies ROS generation during aminoglycoside-induced hair cell death
- Esterberg, R., Linbo, T., Pickett, S.B., Wu, P., Ou, H.C., Rubel, E.W., Raible, D.W.
- The Journal of Clinical Investigation 126(9): 3556-66 (Journal)
- Registered Authors
- Linbo, Tor, Raible, David
- MeSH Terms
- Aminoglycosides/adverse effects*
- Cell Death/drug effects*
- Disease Models, Animal
- Hair Cells, Auditory/drug effects*
- Lateral Line System
- Reactive Oxygen Species/metabolism*
- 27500493 Full text @ Journal of Clin. Invest.
Esterberg, R., Linbo, T., Pickett, S.B., Wu, P., Ou, H.C., Rubel, E.W., Raible, D.W. (2016) Mitochondrial calcium uptake underlies ROS generation during aminoglycoside-induced hair cell death. The Journal of Clinical Investigation. 126(9):3556-66.
Exposure to aminoglycoside antibiotics can lead to the generation of toxic levels of reactive oxygen species (ROS) within mechanosensory hair cells of the inner ear that have been implicated in hearing and balance disorders. Better understanding of the origin of aminoglycoside-induced ROS could focus the development of therapies aimed at preventing this event. In this work, we used the zebrafish lateral line system to monitor the dynamic behavior of mitochondrial and cytoplasmic oxidation occurring within the same dying hair cell following exposure to aminoglycosides. The increased oxidation observed in both mitochondria and cytoplasm of dying hair cells was highly correlated with mitochondrial calcium uptake. Application of the mitochondrial uniporter inhibitor Ru360 reduced mitochondrial and cytoplasmic oxidation, suggesting that mitochondrial calcium drives ROS generation during aminoglycoside-induced hair cell death. Furthermore, targeting mitochondria with free radical scavengers conferred superior protection against aminoglycoside exposure compared with identical, untargeted scavengers. Our findings suggest that targeted therapies aimed at preventing mitochondrial oxidation have therapeutic potential to ameliorate the toxic effects of aminoglycoside exposure.
Genes / Markers
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes