Abstract
目的 探讨8Hz次声对大鼠空间学习记忆行为的影响及其作用机制.方法大鼠分别暴露于8Hz,90dB、100dB或130dB次声仓中,每日2小时,之后进行Morris水迷宫训练,记录其找到隐匿站台的时间;第6天训练结束后取脑并进行免疫组织化学染色,光镜下分析其海马及颞叶皮层5-羟色胺(5-HT)及5-羟色胺受体(5-HTR)含量.结果次声组大鼠在水迷宫中逃离水难的时间均较对照组延长(P=0.010及P=0.001,P=0.000);次声组大鼠海马及颞叶皮层5-HT、5-HTR含量均较对照组减少(均P=0.000);大鼠在水迷宫中找到隐匿站台的时间与其海马及颞叶皮层5-HT、 5-HTR含量呈负相关.结论 8Hz,90dB、100dB及130dB次声可使大鼠空间学习记忆能力降低,并且随次声声压级的增加其作用愈加明显,作用机制可能与海马及颞叶皮层5-HT、5-HTR的减少有关。
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