亚氨乙基赖氨酸对庆大霉素所致豚鼠耳蜗损伤的拮抗作用

探讨亚氨乙基赖氨酸对庆大霉素所豚鼠耳蜗损伤的拮抗作用。将实验豚鼠分为正常对照组、实验对照组和实验组。实验对照组和实验组豚鼠皮下注射庆大霉素，同时实验组豚鼠腹腔注射亚氨乙基赖氨酸，实验对照组豚鼠腹腔注射等量生理盐水。正常对照组豚鼠皮下及腹腔均注射等量的生理盐水。用免疫组织化学的方法检测诱生型一氧化氮合成酶在各组豚鼠耳蜗中的表达。用ABR检测各组豚鼠听阈的改变，同时以扫描电镜观察耳蜗毛细胞的损伤。结果显示，诱生型一氧化氮合成酶在正常对照耳蜗的表达呈阴性，在实验对照组和实验组耳蜗的表达呈阳性，且在实验对照组的表达强于实验组。实验组ABR阈移明显小于实验对照组，且实验组耳蜗的损伤明显轻于实验对照组，研究表明，诱生型一氧化氮合成酶在庆大霉素损伤耳蜗中呈阳性表达。亚氨乙基赖氨酸对庆大霉素所致豚鼠耳蜗损伤有明显的拮抗作用，提示一氧化氮在庆大霉素所致耳蜗的损伤中起重要作用。

THE ANTI-OTOTOXIC EFFECT OF IMINOETHYL-LYSINE ON GUINEA PIG′S COCHLEA DAMAGED BY GENTAMICIN

The object of this study was to investigate the anti-ototoxic effect of iminoethyl-lysine on cochlea of guinea pig damaged by gen-tamicin. The experiment consisted of three groups: normal control group, experimental treatment control group and experimental treatment group. Guinea pigs of the latter two groups were subjected to hypodermic injection of gentamicin, at the same time guinea pigs of the experimental treatment group were treated with intraperitoneal injection of iminoethyl-lysine. while guinea pigs of the experimental control group were treated with the same volume of saline. Guinea pigs of the normal control group were treated with hypodermic and intraperitoneal injection of the same volume of saline as that of the other two groups. The expression of iNOS was examined in the cochleas of all groups by immunohisto-chemistry. ABR hearing threshold shift were examined, and the damage of hair cells of cochleas of all groups was investigated by scanning electronic microscopy. The results showed that iNOS expression was negative in cochleas of the normal control group, and positive in that of other two groups. The expression of iNOS in the experimental control group was much more stronger than that of the experimental treatment group. The ABR threshold shift of the experimental treatment group was much more lower than that of the experimental control group. The damage of cochlea of the experimental control group was much more severe than that of the experimental treatment group. These results suggest that the expression of iNOS is positive in gentamicin-damaged cochleas. Iminoethyl-lysine has significant anti-ototoxic effect on the cochlea damaged by gentamicin, suggesting nitric oxide plays a very important part in the process of the cochlea injury by gentamicin.