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Title: Dose-dependant radiation-induced apoptosis in a cochlear cell-line
Authors: Low, W.-K.
Tan, M.G.K.
Sun, L.
Chua, A.W.C.
Goh, L.-K.
Wang, D.-Y. 
Keywords: Cell death
Hearing loss
Issue Date: Dec-2006
Citation: Low, W.-K., Tan, M.G.K., Sun, L., Chua, A.W.C., Goh, L.-K., Wang, D.-Y. (2006-12). Dose-dependant radiation-induced apoptosis in a cochlear cell-line. Apoptosis 11 (12) : 2127-2136. ScholarBank@NUS Repository.
Abstract: Cisplatin and gentamycin are both ototoxic and they have been shown to induce cochlear cell apoptosis. Although radiation is also ototoxic, radiation-induced apoptosis in cochlear cells has not been studied. This study aimed to investigate the biophysical changes of dose-related radiation-induced cochlear cell apoptosis in an experimental model. Post gamma-irradiation apoptosis was demonstrated in the cochlear cell-line OC-k3 by flow cytometry and TUNEL assay. This was dose-dependant with enhanced apoptosis resulting after 20 than 5 Gy, and occurred predominantly at 72 h post-irradiation. Microarray analysis showed associated dose-dependant apoptotic gene regulation changes. Western blotting revealed p53 up-regulation of at 72 h and phosphorylation at 3, 24, 48 and 72 h after irradiation. Early activation of c-jun occurred at 3 h, but was not sustained with time. Associated dose-dependant intracellular generation of reactive oxygen species (ROS) was also demonstrated using 2′, 7′-dichlorofluorescein diacetate. In conclusion, this study demonstrated a dose-dependant cochlear cell apoptosis and associated ROS generation after irradiation, with p53 possibly playing a key role. Based on this ROS-linked apoptotic model, anti-oxidants and anti-apoptotic factors could potentially be used to prevent radiation-induced sensori-neural hearing loss. As these medications can be delivered topically through the middle ear, their systematic side effects could therefore be minimized. © 2006 Springer Science + Business Media, LLC.
Source Title: Apoptosis
ISSN: 13608185
DOI: 10.1007/s10495-006-0285-4
Appears in Collections:Staff Publications

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