微量元素硒对噪声性聋防护作用的实验研究

目的探讨微量元素硒（Se）对豚鼠噪声性听力损伤的保护作用。方法雄性杂色豚鼠40只,体重250～350g,随机分为正常对照组、Se组、Nacl＋噪声组和Se＋噪声组,每组10只。正常对照组不作任何处理,Se组仅连续5d腹腔注射亚硒酸钠（Na2SeO30.7mg/kg,1次/d）,Nacl＋噪声组在噪声暴露前连续5d腹腔注射等量生理盐水（0.9%Nacl）,Se＋噪声组在噪声暴露前连续5d腹腔注射Na2SeO3,均为每日1次。采用窄带噪声,中心频率4kHz,强度为120dBSPL,持续4h。所有动物均于噪声暴露前行脑干诱发电位检测（ABR）;噪声暴露后每组各取5只立即断头处死,取出双侧耳蜗测谷胱甘肽过氧化物酶（GSH-Px）活性,各组剩余的5只于1、10d后测ABR,最后一次测完ABR后处死,取基底膜铺片染色。结果 Nacl＋噪声组和Se＋噪声组于1、10d后的ABR阈值较噪声暴露前有明显提高,差异有统计学意义;Nacl＋噪声组在噪声暴露前后的阈移较Se＋噪声组高,差异有统计学意义。Se组的GSH-Px活性比正常对照组及Se＋噪声组比Nacl＋噪声组高,差异有统计学意义。耳蜗基底膜铺片可见Nacl＋噪声组和Se＋噪声组中的凋亡、坏死和缺失的细胞,Nacl＋噪声组的受损率高于Se＋噪声组,具有统计学差异。结论硒能增加耳蜗组织中GSH-Px的活性,而GSH-Px作为一种抗氧化酶可能中和一部分因噪声刺激而产生的氧自由基/活性氧,对噪声性耳蜗损伤具有一定的防护作用。

Study of the protective effect of trace element Se on noise-induced hearing loss in guinea pigs

Objective To explore the protective effect of trace element Se on noise-induced hearing loss in guinea pigs.Methods 40 male pigmented guinea pigs were randomly divided into 4 groups(normal control group,Se group,Saline+noise group and Se+noise group,10 animals for each group).Animals of normal control group received no treatment;those of Se group were treated only with Na2SeO3 solution(0.7 mg/kg,i.p.administered,once per day for consecutive 5 days);those of Saline+noise group were given normal saline as the...