Protective effect of adenovirus-mediated erythropoietin expression on the spiral ganglion neurons in the rat inner ear

Zhong,Cheng; Jiang,Zhendong; Guo,Qiang; Zhang,Xueyuan

doi:10.3892/ijmm.2018.3455

Protective effect of adenovirus-mediated erythropoietin expression on the spiral ganglion neurons in the rat inner ear

Authors:
- Cheng Zhong
- Zhendong Jiang
- Qiang Guo
- Xueyuan Zhang
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Affiliations: Department of Otolaryngology, Southwest Hospital, The Third Military Medical University, Chongqing 400038, P.R. China, Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, The Third Military Medical University, Chongqing 400038, P.R. China
Published online on: February 5, 2018 https://doi.org/10.3892/ijmm.2018.3455
Pages: 2669-2677
Copyright: © Zhong et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The aim of the present study was to evaluate the expression of erythropoietin (Epo) and the Epo receptor (Epo‑R) in the spiral ganglion neurons (SGNs) of the rat inner ear, and to assess the effect of Epo adenovirus vector (Ad‑Epo) on the spontaneous apoptosis of SGNs. A total of 60 ears from 30 healthy neonatal (2‑3 days postnatal) Sprague‑Dawley rats were used to examine the expression of Epo in the SGNs. The rats were divided into three groups: The negative control group, the vector control group [infected with a green fluorescent protein expression vector (Ad‑GFP)] and the Ad‑Epo group (infected with Ad‑Epo). The expression of Epo and Epo‑R was detected by immunohistochemistry and dual immunofluorescence staining using polyclonal antibodies directed against Epo and Epo‑R, followed by confocal laser‑scanning microscopy. An adenovirus vector was constructed and used to transfect the cultured SGNs. Following adenovirus infection, apoptosis of the SGNs was evaluated and Epo protein expression was assessed. Epo and Epo‑R were widely expressed in the plasma membrane and the cytoplasm of the SGNs, as well as in the organ of Corti and the stria vascularis within the inner ear. Epo protein expression was upregulated in the Ad‑Epo group compared with that in the other two groups (P<0.05). Apoptotic cells were seldom observed at day 4 of SGN culture in the negative control group. At day 7, marked apoptotic cells were detected in the negative control group and the vector control group. The apoptosis level in the Ad‑Epo group was significantly decreased compared with that in the negative control group or the vector control group at day 7 (P<0.05). In conclusion, Epo and Epo‑R are expressed in the SGNs of the inner ear of the rat, and Ad‑Epo can decrease the spontaneous apoptosis of SGNs, which may provide a basis for the prevention or alleviation of sensorineural hearing loss.

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