首都医科大学学报 ›› 2009, Vol. 30 ›› Issue (6): 741-745.doi: 10.3969/j.issn.1006-7795.2009.06.004

• 耳鼻咽喉头颈外科进展 • 上一篇    下一篇

JNK信号通路在老年大鼠耳蜗细胞凋亡中的作用

谢静1, 罗凌惠2, 薛秋红3, 龚树生1   

  1. 1. 首都医科大学附属北京同仁医院耳鼻咽喉头颈外科;2. 华中科技大学同济医学院附属协和医院耳鼻咽喉科;3. 武汉科技大学附属医院耳鼻咽喉科
  • 收稿日期:2009-09-22 修回日期:1900-01-01 出版日期:2009-12-21 发布日期:2009-12-21
  • 通讯作者: 龚树生

Role of JNK Signaling Pathway Involved in the Cochlea of Aged Rats

XIE Jing1, LUO Ling-hui2, XUE Qiu-hong3, GONG Shu-sheng1   

  1. 1. Department of Otorhinolaryngology, Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University;2. Department of Otorhinolaryngology, Union Hospital of Tongji Medical College, Huazhong University of Science and Technology;3. Department of Otorhinolaryngology, Medical College of Wuhan Science and Technology University
  • Received:2009-09-22 Revised:1900-01-01 Online:2009-12-21 Published:2009-12-21

摘要: 目的 探讨c-Jun氨基末端激酶(c-Jun amino-terminal kinase,JNK)信号通路在老年大鼠耳蜗细胞凋亡中的作用,为老年性聋的预防和治疗提供更多的切入点。方法 Wistar大鼠24只,其中12只为对照组(3~4月龄),12只为自然衰老组(22~24月龄);听性脑干反应(auditory brainstem response,ABR)检测听力学改变;采用透射电镜观察老年大鼠耳蜗的超微病理变化;用免疫组化及Western blotting方法检测p-JNK和p-c-Jun蛋白的表达。结果 老年组大鼠听力〔(72.083±13.345)dBSPL〕较对照组〔(32.083±3.878)dBSPL〕明显下降,差异具有统计学意义(P<0.01);透射电镜下可见外毛细胞有凋亡样改变,螺旋神经节细胞内大量脂褐素沉着;在耳蜗石蜡切片中可观察到p-JNK和p-c-Jun免疫反应阳性细胞,定位于细胞核,老年组与对照组相比,差异具有统计学意义(P<0.05);Western blotting结果显示老年组内耳组织p-JNK和p-c-Jun的蛋白表达明显高于对照组,差异有统计学意义(P<0.05)。结论 在大鼠老年性聋的发生过程中,各种损伤因素可能通过激活JNK信号通路而促使耳蜗细胞的凋亡。

关键词: 内耳, 老年性聋, c-Jun氨基末端激酶, 凋亡

Abstract: Objective To explore the involvement of c-Jun amino-terminal kinase pathway(JNK, also known as stress-activated protein kinase/SAPK) in the cochlear of aged rats. Methods Hearing threshold was detected with auditory brainstem response(ABR). Transmission electron microscopy(TEM) was used to observe the ultrastructure of cochlear. In addition, expression of p-JNK and p-c-Jun were detected by immunohistochemistry and Western blotting. Results Auditory threshold in the aged group〔(72.083±13.345)dBSPL〕 was elevated compared to the control group〔(32.083±3.878)dBSPL〕, P<0.01). Accordingly, apoptosis was confirmed in the cochlea from aged group by TEM. The expression of p-JNK and p-c-Jun were significantly increased in the aged groups(P<0.05). Conclusion The activation of JNK singling pathway maybe contributed to the apoptosis of aged cochlear, which probably provided more possibility in prevention and treatment of the presbycusis.

Key words: inner ear, presbycusis, c-Jun amino-terminal kinase, apoptosis

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