慢性不可预见性温和刺激大鼠模型的听性脑干反应的改变

摘要

Objective To study changes of auditory brainstem response (ABR) in a rat model of depression induced by chronic unpredictable mild stress (CUMS). Methods Sixteen rats were randomly divided into a control group (n=8) and a mod-el group (n=8). The model group was randomly treated with CUMS every day to keep animals in a depressive state for 28 days. Animal behaviors were recorded using an automatic tracking system at 1 day before experiment and on Days 14 and 28. In the present study, ABRs were tested using a TDT system on Day 28 for all animals. Results Compared with the control group, the basic indices of animal behavior of the model group were markedly different from the control group on Days 14 and 28 (p<0.01), indicating successful modeling, although there was no statistical difference on ABR thresholds between the two groups (P>0.05). The latencies of waves I and V in the model group were significantly longer than the control group (P<0.05) and the amplitudes of waves II and V were markedly decreased compared to the control group (P<0.05 and P<0.01, respectively). Con-clusion Abnormal neuroelectric activities along the auditory pathway from the peripheral auditory organ to the brainstem may exist in rats with CUMS induced depression .%　　目的探讨单纯抑郁症大鼠模型的听性脑干反应（ABR）的改变。方法16只大鼠随机分为对照组（8只）：正常喂养；模型组（8只）：每天随机给予多种低强度刺激，造成动物的抑郁状态，持续28天。记录各组大鼠实验前1天、第14、28天的行为学，并在造模完成后对两组大鼠行ABR检测。结果造模第14、28天，与对照组比较，模型组大鼠的旷场行为学、体重及摄食量的改变、糖水偏爱均有显著性差异（p<0.01）；第28天，在声强90dB SPL条件下，与对照组比较，模型组大鼠的Ⅰ波潜伏期明显延长(P<0.05)，Ⅱ波的波幅显著下降，差异有统计学意义(P<0.05)。结论抑郁症模型大鼠可能存在外周听觉神经至脑干通路存在神经电活动的异常。