γ分泌酶抑制剂DAPT对庆大霉素致大鼠耳损伤及修复过程中听力及Notch2/hes1信号通路表达的影响

Effects of DAPT on Hearing and Notch2/hes1 Signaling Pathways Expression in Gentamicin-induced Hearing Injury and Repair Process in Rat

黄飞;刘成福;王小琴;

1:湖北中医药大学中医临床学院

2:湖北省中医院肾内科

摘要
目的观察γ分泌酶抑制剂DAPT对庆大霉素致大鼠耳损伤及修复过程中听力变化及Notch2/hes1信号通路表达的影响。方法 72只成熟大鼠随机分成三组,每组24只;对照组给予生理盐水3ml.kg-1.d-1腹腔注射,连继10天,庆大霉素组给予Gen 120mg.kg-1.d-1腹腔注射,连继10天,DAPT组给予DAPT 5mg.kg-1.d-1腹腔注射,连用5天后停用2天,再用3天,同时腹腔注射Gen 120mg.kg-1.d-1,连继10天。各组注射前及注射后1、14、28天进行ABR检测后处死动物,应用免疫印迹蛋白、实时定量PCR观察大鼠Notch2/hes1信号通路的表达。结果对照组注射前后ABR反应阈无明显变化,与注射前相比,DAPT组和庆大霉素组注射后1、14、28天ABR阈值均明显升高,但随时间的延长阈值有所下降(P<0.05),其中,第28天DAPT组ABR反应阈较庆大霉素组下降明显(P<0.05);与对照组相比,DAPT组和庆大霉素组Notch2/hes1的表达均明显增高(P<0.05);与庆大霉素组相比,DAPT组的Notch2/hes1表达明显降低(P<0.05)。结论在庆大霉素致耳损伤及修复过程中,DAPT可能通过抑制Notch2/hes1信号通路减轻耳蜗毛细胞损伤并促进耳蜗毛细胞修复,进而促进听功能恢复。
关键词
γ分泌酶抑制剂;Notch2/hes1信号通路;庆大霉素;听力;大鼠
基金项目(Foundation):
国家临床重点专科建设项目资助
作者
黄飞;刘成福;王小琴;
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