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Therapeutic potential of the mitochondria-targeted antioxidant MitoQ in mitochondrial-ROS induced sensorineural hearing loss caused by Idh2 deficiency

Authors
 Ye-Ri Kim  ;  Jeong-In Baek  ;  Sung Hwan Kim  ;  Min-A Kim  ;  Byeonghyeon Lee  ;  Nari Ryu  ;  Kyung-Hee Kim  ;  Deok-Gyun Choi  ;  Hye-Min Kim  ;  Michael P. Murphy  ;  Greg Macpherson  ;  Yeon-Sik Choo  ;  Jinwoong Bok  ;  Kyu-Yup Lee  ;  Jeen-Woo Park  ;  Un-Kyung Kim 
Citation
 REDOX BIOLOGY, Vol.20 : 544-555, 2019 
Journal Title
 REDOX BIOLOGY 
Issue Date
2019
MeSH
Animals ; Apoptosis/genetics ; Biomarkers/metabolism ; Disease Models, Animal ; Fluorescent Antibody Technique ; Hair Cells, Auditory/drug effects ; Hair Cells, Auditory/metabolism ; Hearing Loss, Sensorineural/drug therapy ; Hearing Loss, Sensorineural/genetics* ; Hearing Loss, Sensorineural/metabolism* ; Hearing Loss, Sensorineural/physiopathology ; Homozygote ; Immunohistochemistry ; Isocitrate Dehydrogenase/deficiency* ; Mice ; Mice, Knockout ; Mitochondria/genetics* ; Mitochondria/metabolism* ; Organophosphorus Compounds/pharmacology* ; Oxidation-Reduction ; Oxidative Stress ; Reactive Oxygen Species/metabolism* ; Spiral Ganglion/cytology ; Spiral Ganglion/drug effects ; Spiral Ganglion/metabolism ; Ubiquinone/analogs & derivatives* ; Ubiquinone/pharmacology
Keywords
Antioxidant ; Hearing loss ; Idh2 ; MitoQ ; NADP(+) ; ROS
Abstract
Mitochondrial NADP+-dependent isocitrate dehydrogenase 2 (IDH2) is a major NADPH-producing enzyme which is essential for maintaining the mitochondrial redox balance in cells. We sought to determine whether IDH2 deficiency induces mitochondrial dysfunction and modulates auditory function, and investigated the protective potential of an antioxidant agent against reactive oxygen species (ROS)-induced cochlear damage in Idh2 knockout (Idh2-/-) mice. Idh2 deficiency leads to damages to hair cells and spiral ganglion neurons (SGNs) in the cochlea and ultimately to apoptotic cell death and progressive sensorineural hearing loss in Idh2-/- mice. Loss of IDH2 activity led to decreased levels of NADPH and glutathione causing abnormal ROS accumulation and oxidative damage, which might trigger apoptosis signal in hair cells and SGNs in Idh2-/- mice. We performed ex vivo experiments to determine whether administration of mitochondria-targeted antioxidants might protect or induce recovery of cells from ROS-induced apoptosis in Idh2-deficient mouse cochlea. MitoQ almost completely neutralized the H2O2-induced ototoxicity, as the survival rate of Idh2-/- hair cells were restored to normal levels. In addition, the lack of IDH2 led to the accumulation of mitochondrial ROS and the depolarization of ΔΨm, resulting in hair cell loss. In the present study, we identified that IDH2 is indispensable for the functional maintenance and survival of hair cells and SGNs. Moreover, the hair cell degeneration caused by IDH2 deficiency can be prevented by MitoQ, which suggests that Idh2-/- mice could be a valuable animal model for evaluating the therapeutic effects of various antioxidant candidates to overcome ROS-induced hearing loss.
Files in This Item:
T201901604.pdf Download
DOI
10.1016/j.redox.2018.11.013
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Anatomy (해부학교실) > 1. Journal Papers
Yonsei Authors
Bok, Jin Woong(복진웅) ORCID logo https://orcid.org/0000-0003-1958-1872
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/169992
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