摘要
目的:研究腺苷在急性噪声性声损伤中对耳蜗谷氨酸和复合动作电位的影响。方法:豚鼠暴露于白噪声118 dBSPL(sound pressure level,声压水平) 30 min,同时耳蜗灌流单纯或含不同浓度(0.1、1或5 mmol/L)腺苷的人工外淋巴液,高效液相色谱检测分析噪声暴露前、后外淋巴中谷氨酸浓度,测试噪声暴露前后听神经复合动作电位的阈值。结果:噪声暴露后耳蜗外淋巴液中谷氨酸含量显著升高, 给予1 mmol/L 和5 mmol/L腺苷可以抑制谷氨酸浓度的升高。噪声暴露后复合动作电位阈值增大, 同时给予腺苷灌流组阈移减小。结论:腺苷可使噪声暴露后耳蜗外淋巴中谷氨酸浓度明显降低, 复合动作电位阈移值减小,提示腺苷对急性声损伤耳蜗有保护作用。
Objective:To investigate the protective effect of adenosine on cochlea in acute acoustic trauma. Methods: Guinea pigs were exposed to 118 dB SPL white noise for 30 min. During the process of exposure, artificial perilymph or artificial perilymph containing adenosine (0.1 mmol/L,1 mmol/L or 5 mmol/L) was infused into the cochlea through perilymphatic perfusion. Concentration of glutamate in perilymph and thresholds of compound action potentials (CAP) were measured before and after noise exposure. Results: After exposure, the concentration of glutamate and the mean threshold shifts evoked by click were significantly higher than those of before exposure. Concentration of glutamate and thresholds of CAP in adenosine (1 mmol/L and 5 mmol/L) treated groups were significantly lower than those of the control group. Conclusion: Adenosine can inhibit the elevation of glutamate and decrease the threshold shift of CAP after exposure to noise,which can protect cochlea in acute acoustic trauma in guinea pigs.
出处
《第二军医大学学报》
CAS
CSCD
北大核心
2005年第2期164-166,共3页
Academic Journal of Second Military Medical University
基金
国家自然科学基金(30100038)
关键词
腺苷
谷氨酸
噪声
外淋巴灌流
adenosine
glutamate
noise
perilymph perfusion
