内耳相关基础研究专辑饱和氢生理盐水对噪声性聋的预防作用

摘要

目的 探讨饱和氢生理盐水是否具有预防噪声性聋的作用.方法 取清洁级白色健康、ABR阈值正常豚鼠15只,雌雄不限,体重250～300 g.随机分成3组,空白对照组5只；生理盐水对照组5只;饱和氢生理盐水处理组5只,于噪声暴露前1小时给予腹腔注射饱和氢生理盐水,1 ml/100g.给予脉冲噪声(压力峰值157 dBSPL,脉宽0.25 ms)连续暴露100次.于脉冲噪声暴露后即刻、第1天、第2天、第4天、第8天测听性脑干反应(auditory brainstem respons,ABR)；第8天采用琥珀酸脱氢酶(Succinate Dehydrogenase,SDH)染色观察外毛细胞的形态学变化.结果噪声暴露后,饱和氢生理盐水处理组在各时间点的ABR阈值均明显低于对照组,有统计学意义(P＜0.01)；光学显微镜下可见空白对照组及生理盐水对照组动物耳蜗SDH几乎不着色,细胞肿胀或缺失,排列不规则；饱和氢生理盐水处理组SDH着色较深,存在散在片状无染色区,细胞缺失明显减少,排列较规则;耳蜗底回同一部位外毛细胞存活计数,空白对照组为45.17±12.15个,盐水对照组为44.50±10.02个,二者无明显差别；饱和氢生理盐水处理组分别为116.50±2.38个与对照组有统计学意义(P＜0.05).结论腹腔注射饱和氢生理盐水可拮抗强脉冲噪声引起的耳蜗损伤,能够对噪声性聋起到一定程度的预防作用.%Objective To study effects of saturated hydrogen saline in preventing noise-induced hearing loss. Methods Fifteen guinea pigs were randomly divided into 3 groups (5 each) to receive no treatment, treatment with normal saline or treatment with saturated hydrogen saline given intraperitoneally at 1 hour before noise exposure at 1 ml/ 100g. One hundred rounds of impulse noise (157 dB SPL peak) were delivered as noise exposure. Immediately after exposure to impulse noise and on Days 1, 2, 4 and 8 following exposure, auditory brainstem response (ABR) thresholds were measured. Outer hair cell morphological changes and succinate dehydrogenase (SDH) activity were examined on Day 8 post-exposure. Results Immediately after noise exposure, ABR thresholds in saturated hydrogen saline treated animals were lower than the non-treated animals (P< 0.05). Microscopy showed little SDH staining, cell swelling and irregular cell arrangement in the non-treated or normal saline treated animals. Whereas in the saturated hydrogen saline treated animals, there was deep SDH staining with significantly reduced cell loss and more regular cellular arrangement compared to the other two groups. The surviving cells counts was 45.17 ± 12.15 for non-treated animals, 44.50 ± 10.02 for normal saline treated animals and, 116.50 ± 2.38 for animals treated with saturated hydrogen saline. While the count was similar between non-treated and normal saline treated animals, it was significantly higher in saturated hydrogen saline treated animals (P< 0.05). Conclusions Intraperitoneal injection of saturated hydrogen saline appears to protect the cochlea a-gainst noise-induced damage.