慢性庆大霉素损伤后豚鼠前庭上皮细胞的凋亡和再生观察

Apoptosis and Proliferation Following Chronic Gentamicin Toxicity in Guinea Pig Vestibular Sensory Epithelium

马晓莉;黄维国;王锦玲;姜鸿彦;刘顺利;邱建华

1:空军总医院耳鼻咽喉科

2:第四军医大学西京医院耳鼻咽喉科

3:第四军医大学西京医院耳鼻咽喉科

4:第四军医大学西京医院耳鼻咽喉科

摘要
目的 观察慢性庆大霉素中毒后豚鼠前庭上皮的损伤和修复过程 ,探讨前庭毛细胞凋亡和再生的关系。方法 采用末端脱氧核苷酸转移酶介导的dUTP缺口末端标记 (terminaldeoxyuncleotidyltransferase -mediateddeoxyuridinetriphosphatenickendlabeling ,TUNEL)法 ,观察前庭感觉上皮细胞的凋亡 ,采用 5’ -溴 - 2 -脱氧尿苷(bromodeoxyuridine,Brdu)免疫细胞化学法观察前庭上皮的再生过程。 结果 对照组没有观察到TUNEL和Brdu阳性细胞。停止庆大霉素注射 1天至 3周均可观察到TUNEL阳性细胞 ,但 1天组阳性细胞数量最多 ,3周仍有阳性细胞存在 ,阳性细胞主要位于毛细胞层。停止庆大霉素注射后 1天组支持细胞层和毛细胞层均有Brdu标记阳性细胞 ,3d组支持细胞层阳性细胞显著增多 ,1周组毛细胞层也出现较多阳性细胞 ,2周组Brdu标记阳性细胞主要位于毛细胞层 ,3周仍可观察到Brdu标记阳性细胞。结论 慢性庆大霉素耳中毒后豚鼠前庭上皮细胞凋亡增加 ,凋亡与增殖伴随存在 ,前庭毛细胞的损伤可能是其增殖的触发因素。增殖过程表现为支持细胞增生向毛细胞增生移行的趋势 ,支持细胞增殖并转化成毛细胞可能是前庭上皮细胞损伤修复机理之一。
关键词
前庭感觉上皮;凋亡;再生;庆大霉素
基金项目(Foundation):
国家自然科学基金资助项目 (3 9870 788)
作者
马晓莉;黄维国;王锦玲;姜鸿彦;刘顺利;邱建华
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