摘要
为探讨哺乳动物前庭毛细胞破坏后能否再生及前庭功能能否恢复，以豚鼠为研究对象。实验组动物每日给予庆大霉素（１５０ｍｇ／ｋｇ）皮下注射，连续１０天，对照组动物给予等量生理盐水。于停药后的第２、４、１２和２４周分别处死动物，扫描电镜观察发现，停药２周椭圆囊和壶腹嵴毛细胞破坏最明显的区域可见到不成熟的毛细胞纤毛丛，至停药２４周后继续存在。与对照组相比，停药１２周毛细胞密度（毛细胞数／１００μｍ基底膜长度）下降明显（Ｐ＜０．０１），停药后２４周时毛细胞密度较１２周明显上升（Ｐ＜０．０５），但仍未达到正常水平（Ｐ＜０．０５）。另取豚鼠按上述方法进行庆大霉素注射，于注射前和停药后４、１２和２４周进行冰水诱发眼震电图检查，可见停药４～１２周平均慢相眼震速度（Ｖｍｅａｎ）明显下降（Ｐ＜０．０１），停药２４周后Ｖｍｅａｎ有明显恢复（Ｐ＜０．０５），但仍未达到正常水平（Ｐ＜０．０１）。提示：豚鼠周围前庭功能破坏后可以部分恢复，前庭毛细胞破坏后可以修复，其功能的恢复可能源于毛细胞再生。
To investigate the possibility of regeneration and functional restoration of vestibular hair cells after toxic destruction, gentamicin (150 mg/kg per day) was given to guinea pigs subcutaneously for 10 days to induce damage of vestibular hair cells. The control animals received the same volume of saline. At 2,4,12 and 24 weeks after the treatment, animals were sacrificed and their vestibular organs prepared for scanning electronic microscopic study. Change of the hair cell density was studied using quantitative analysis techniques. Electronystagmogram, induced with ice water, was taken before and at 2,4,12, and 24 weeks after the treatment. Immature stereocillia bundles were noticed in regions with heavy hair cell loss in the utricle and crista ampullaris 2 weeks after treatment and were still visible 24 weeks after the treatment. Hair cell density (number of hair cells/100 μm basilar membrane length) decreased significantly at 12 weeks after treatment as compared with the control ( P <0 01), and showed partial recovery at 24 weeks after treatment as compared with 12 weeks after treatment ( P <0 05) which was still below normall level ( P <0 05). Vmean showed significant reduction at 4 and 12 weeks after treatment ( P <0 01),and recovery at 24 weeks ( P <0 05), which was still below the normal level ( P <0 01). SEM results indicated the potential of repair of vestibular hair cells in guinea pigs after damage which may occur 24 weeks after the damage. Quantitative analysis of hair cell density further suggests that regeneration is the mechanism of repair. The regenerated hair cells seen in this study may play a role in the restoration of vestibular function.
出处
《中华耳鼻咽喉科杂志》
CSCD
1997年第3期153-156,共4页
Chinese Journal of Otorhinolaryngology
关键词
庆大霉素
前庭毛细胞损伤
毛细胞
再生
Hair cells Regeneration Gentamicins Electronystagmography Guinea pigs
