The DNA methylation inhibitor RG108 protects against noise-induced hearing loss
Cell Biol Toxicol. 2021 Mar 15. doi: 10.1007/s10565-021-09596-y. Online ahead of print.
BACKGROUND: Noise-induced hearing loss represents a commonly diagnosed type of hearing disability, severely impacting the quality of life of individuals. The current work is aimed at assessing the effects of DNA methylation on noise-induced hearing loss.
METHODS: Blocking DNA methyltransferase 1 (DNMT1) activity with a selective inhibitor RG108 or silencing DNMT1 with siRNA was used in this study. Auditory brainstem responses were measured at baseline and 2 days after trauma in mice to assess auditory functions. Whole-mount immunofluorescent staining and confocal microcopy of mouse inner ear specimens were performed to analyze noise-induced damage in cochleae and the auditory nerve at 2 days after noise exposure.
RESULTS: The results showed that noise exposure caused threshold elevation of auditory brainstem responses and cochlear hair cell loss. Whole-mount cochlea staining revealed a reduction in the density of auditory ribbon synapses between inner hair cells and spiral ganglion neurons. Inhibition of DNA methyltransferase activity via a non-nucleoside specific pharmacological inhibitor, RG108, or silencing of DNA methyltransferase-1 with siRNA significantly attenuated ABR threshold elevation, hair cell damage, and the loss of auditory synapses.
CONCLUSIONS: This study suggests that inhibition of DNMT1 ameliorates noise-induced hearing loss and indicates that DNMT1 may be a promising therapeutic target. Graphical Headlights • RG108 protected against noise-induced hearing loss • RG108 administration protected against noise-induced hair cell loss and auditory neural damage. • RG108 administration attenuated oxidative stress-induced DNA damage and subsequent apoptosis-mediated cell loss in the cochlea after noise exposure.
PMID:33723744 | DOI:10.1007/s10565-021-09596-y
Cell biology and toxicology
DATE – PUBLISHED:
Tue, 16 Mar 2021 06:00:00 -0400
DATE – DOI:
DATE – ADDED:
LINK – PUBMED:
LINK – DOI:
LINK – PUBLISHER:
Hearing Loss Treatment Report, Urgent Research, 2021-03-16T18:49:43+00:00, https://www.hearinglosstreatmentreport.com.