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A study on toxic effects of sodium salicylate on rat cochlear spiral ganglion neurons: dopamine receptors mediate expressions of NMDA and GABAA receptors

WEI Ting-Jia, CHE Hui-Ying, HUANG Xi, WENG Jing-Jin, QIN Jiang-Yuan, SU Ji-Ping^*

Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China

Abstract

The aim of the present study was to observe whether dopamine receptor (DR) was involved in the effects of sodium salicylate (SS) on the expressions of N-methyl-D-aspartic acid (NMDA) and γ-aminobutyric acid (GABA) receptors in rat cochlear spiral ganglion neurons (SGNs). Forty-eight hours after primary culture of rat SGNs, immunofluorescence technique was applied to detect expressions of DR1 and DR2, the two subtypes of dopamine receptors. Western blot was performed to assess NMDA receptor NR1 subunit and GABAA receptor subunit α2 (GABRα2) protein expressions in the SGNs after the treatments of SS alone or in combination with DR antagonists. The results demonstrated that: (1) The DR1 and DR2 were expressed in the bodies and axons of the SGN; (2) After the treatment with SS, the surface protein expressions of GABRα2 and NR1 were decreased by 44.69% and 21.57%, respectively, while the total protein expressions showed no significant changes; (3) Neither SS + SCH23390 (DR1 antagonist) group nor SS + Eticlopride (DR2 antagonist) group showed significant differences in GABRα2 and NR1 surface protein expressions compared with the control group. These results suggest that SS regulates the surface GABAA and NMDA receptors trafficking on SGN, and the mechanism may involve DR mediation.

Key words: sodium salicylate; spiral ganglion neurons ; dopamine receptor ; NMDA receptor ; GABAA receptor

Received: 2016-09-21　　Accepted: 2017-03-24

Corresponding author: 苏纪平　　E-mail: ymsu2@126.com

Citing This Article：

WEI Ting-Jia, CHE Hui-Ying, HUANG Xi, WENG Jing-Jin, QIN Jiang-Yuan, SU Ji-Ping. A study on toxic effects of sodium salicylate on rat cochlear spiral ganglion neurons: dopamine receptors mediate expressions of NMDA and GABAA receptors. Acta Physiol Sin 2017; 69 (3): 285-290 (in Chinese with English abstract).