水杨酸钠致耳鸣大鼠脑海马区促肾上腺皮质激素释放因子的表达

The Expression of Corticotropin-Releasing Factor in Rat's Hippocampus Involves in the Pathology of Salicylate Induced Tinnitus

解为全;廖华;杨希林;陈抗松;邹哲飞;李暐;

1:武汉大学人民医院耳鼻咽喉-头颈外科

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摘要

目的观察水杨酸纳致耳鸣大鼠海马区促肾上腺皮质激素释放因子(corticotropin-releasing factor,CRF)的表达,探讨其参与水杨酸钠致耳鸣的可能机制。方法将ABR反应阈<30dB SPL的30只健康Wistar大鼠随机分为A、B、C三组,每组10只。A组注射10%水杨酸钠溶液350mg.kg-1.d-1,共注射21天,B组注射10%水杨酸钠溶液350mg.kg-1.d-1,共注射14天,C组(对照组)腹腔注射等量生理盐水14天。给药前采用改良的饮水抑制法对各组大鼠进行条件反射训练,条件反射消退期开始注射水杨酸钠并检测各组大鼠饮水抑制率(R值);分别于给药前两天、首次给药后2h、给药结束后当天检测各组大鼠ABR反应阈,然后将大鼠处死并断头取脑,剥离海马区,采用Western blot方法检测CRF在各组大鼠海马区的表达。结果条件反射消退期1～3天A、B两组大鼠R值大于C组(P<0.05),证明耳鸣大鼠模型建立成功;首次给药后2h及给药结束后A、B两组ABR反应阈均较给药前提高了约30dB(P<0.05),但A、B两组间ABR反应阈差异无统计学意义(P>0.05);大鼠脑海马区CRF表达量A组>B组>C组(P<0.05)。结论水杨酸钠注射致耳鸣大鼠的海马区情绪应激相关蛋白CRF表达增强,且随注射时间延长其表达量增加,提示CRF表达升高可能是边缘系统参与耳鸣的重要机制之一。

关键词

水杨酸钠;耳鸣;促肾上腺皮质激素释放因子;海马

基金项目(Foundation):

国家自然科学基金面上项目(30772397)资助

作者

解为全;廖华;杨希林;陈抗松;邹哲飞;李暐;

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