长期注射水杨酸钠对大鼠听皮层酪氨酸受体激酶B及c-fos基因表达的影响

Effects of Long Term Administration of Sodium Salicylate on the Expression of TrkB and c-fos in Rat Auditory Cortex

李锦秀;杨琨;吴莎;华清泉;

1:武汉大学人民医院耳鼻咽喉头颈外科

摘要
目的通过观察长期注射水杨酸钠后大鼠听皮层中酪氨酸受体激酶B(TrkB)及c-fos基因的表达,探讨其在水杨酸钠耳毒性机制中的作用。方法健康成年Wistar大鼠36只,分为正常组(不做任何处理)、慢性组(肌肉注射水杨酸钠175mg/kg,2次/天,时间间隔8小时,连续注射14天)、慢性恢复组(前期处理同慢性组,停药后恢复28天),每组12只。造模结束后各组大鼠均行听性脑干反应(ABR)检测,然后断头处死并迅速取出听皮层,运用实时荧光定量PCR技术及Western-blot技术分别检测三组大鼠听皮层中TrkB及c-fos的表达。结果正常组ABR反应阈为36±2.23dB SPL,慢性组反应阈升高为41.3±3.31dB SPL,与正常组比较,差异有显著统计学意义(P<0.01);慢性恢复组ABR反应阈为38.6±5.51dB SPL,与正常组比较,差异无统计学意义(P>0.05)。慢性组听皮层c-fos mRNA表达为1.24±0.09,蛋白的表达为0.70±0.12,慢性恢复组听皮层c-fos mRNA的表达为1.23±0.04,蛋白的表达为0.68±0.08,两组均高于正常组(分别为1.12±0.05、0.50±0.04),差异有统计学意义(P<0.01)。慢性组听皮层TrkB mRNA表达为1.26±0.10,蛋白的表达为1.85±0.17,慢性恢复组听皮层TrkB mRNA表达为1.23±0.07,蛋白的表达为1.80±0.08,均高于正常组(分别为1.11±0.03,1.53±0.16),差异有统计学意义(P<0.05)。结论长期注射水杨酸钠后大鼠听皮层c-fos基因表达升高,可能与听觉中枢神经活动增强有关;长期注射水杨酸钠可能通过上调大鼠听皮层TrkB的表达,增强听皮层神经营养因子的功能促进听皮层功能重塑。
关键词
水杨酸钠;酪氨酸受体激酶B;c-fos基因
基金项目(Foundation):
国家自然科学基金青年基金(81100712)资助
作者
李锦秀;杨琨;吴莎;华清泉;
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