Abstract
In this study, we aimed to elucidate the restorative effects of olfactory epithelium neural stem cells (oe-NSCs) implantation on noise-induced hearing loss and establish their mechanism of action. To model hearing loss, rats were subjected to consecutive seven-day noise exposure. Then, oe-NSCs were implanted into cochlear tissue by retroauricular approach. Auditory brainstem response (ABR) method was used to evaluate the hearing function. Immunohistochemical staining was utilized to determine cell survival and migration of oe-NSCs. After IL-1β stimulation, nerve growth factor (NGF), neurotrophin-3 (NT-3), and NT-4 levels were evaluated in oe-NSCs. The protective action of oe-NSCs against hydrogen peroxide-induced cell injury was detected by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL). oe-NSCs implantation into cochlear tissues ameliorated the noise-induced hearing impairment (p<0.05). After implantation, green fluorescent cells were observed in an even suspension in the lymph fluid of the cochlea, and 65% of the GFP(+) cells reached the cochlear duct wall three days after implantation, but did not expand to the Corti-organ. After IL-1β stimulation, olfactory epithelial stem cell increased their secretio...Continue Reading
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