Identification of a novel series of hair-cell MET channel blockers that protect against aminoglycoside-induced ototoxicity

Kenyon, E.J., Kirkwood, N.K., Kitcher, S.R., Goodyear, R.J., Derudas, M., Cantillon, D.M., Baxendale, S., de la Vega de León, A., Mahieu, V.N., Osgood, R.T., Donald Wilson, C., Bull, J.C., Waddell, S.J., Whitfield, T.T., Ward, S.E., Kros, C.J., Richardson, G.P.
JCI insight   6(7): (Journal)
Registered Authors
Baxendale, Sarah, Whitfield, Tanya T.
Drug screens, Mouse models, Neuroscience, Therapeutics
MeSH Terms
  • Aminoglycosides/adverse effects*
  • Animals
  • Cochlea/cytology
  • Cochlea/drug effects*
  • Drug Evaluation, Preclinical/methods
  • Embryo, Nonmammalian/drug effects
  • Female
  • Gentamicins/adverse effects
  • Gentamicins/pharmacology
  • Hair Cells, Auditory/drug effects
  • Male
  • Mechanotransduction, Cellular/drug effects
  • Mice, Inbred Strains
  • Microbial Sensitivity Tests
  • Microphthalmia-Associated Transcription Factor/genetics
  • Neomycin/adverse effects
  • Organ Culture Techniques
  • Ototoxicity/etiology
  • Ototoxicity/prevention & control*
  • Protective Agents/administration & dosage
  • Protective Agents/pharmacology
  • Zebrafish/embryology
  • Zebrafish/genetics
  • Zebrafish Proteins/genetics
33735112 Full text @ JCI Insight
To identify small molecules that shield mammalian sensory hair cells from the ototoxic side effects of aminoglycoside antibiotics we screened 10,240 compounds, selecting those that protected against neomycin and gentamicin in zebrafish lateral-line hair cells and, when retested in mouse cochlear cultures, prevented gentamicin-induced death of outer hair cells (OHCs). Of 64 compounds that protected zebrafish hair cells, 8 protect OHCs from gentamicin in vitro. These hits share structural features and all block, to varying degrees, the OHC's mechano-electrical transducer (MET) channel, a known route of aminoglycoside entry into hair cells. Further characterisation of one of the strongest MET-channel blockers, UoS-7692, revealed it additionally protects against kanamycin and tobramycin, and does not abrogate the bactericidal activity of gentamicin. UoS-7692 behaves, like the aminoglycosides, as a permeant blocker of the MET channel, significantly reduces gentamicin-Texas Red loading into OHCs, and preserves lateral-line function in neomycin-treated zebrafish. Trans-tympanic injection of UoS-7692 protects mouse OHCs from furosemide-kanamycin exposure in vivo and partially preserves hearing. The results confirm the hair-cell MET channel as a viable target for the identification of compounds that protect the cochlea from aminoglycosides, and provide a series of hit compounds that will inform the design of future otoprotectants.
Genes / Markers
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Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes