N-乙酰半胱氨酸对慢性间歇缺氧大鼠海马神经元凋亡及氧化应激的影响

目的：探讨N-乙酰半胱氨酸(NAC)对慢性间歇缺氧(CIH)模型大鼠海马组织氧化应激及海马神经元凋亡的影响。方法:30只雄性Wistar大鼠随机分为慢性缺氧组、NAC治疗组及正常对照组3组，每组10只。采用化学比色法测定海马组织丙二醛(MDA)、超氧化物歧化酶(SOD)水平，同时应用免疫组化方法检测海马CA1 区磷酸化JNK(p-JNK)表达水平，应用TUNEL法检测海马CA1区神经元凋亡率。结果:NAC治疗组 MDA水平低于CIH组（1.71±0.43 vs 1.37±0.26，P＜0.05）、SOD活性高于CIH组（44.94±14.01 vs 57.66±14.07，P＜0.05），p-JNK表达水平低于CIH组 （0.53±0.10 vs 0.39±0.16，P＜0.05），海马神经元凋亡率显著低于CIH组（0.32±0.18 vs 0.20±0.11，P＜0.05）。结论:NAC能抑制慢性间歇缺氧导致的氧化应激，从而影响JNK信号转导通路，减少海马神经元凋亡。

Effect of NAC on oxidant stress and apoptosis in the hippocampal CA1 region of rats exposured to chronic intermittent hypoxia

AIM: To investigate the effect of N-acetylcystein (NAC) on oxidant stress, neuron apoptosis in the hippocampal CA1 region of rats exposured to chronic intermittent hypoxia (CIH). METHODS: 30 healthy male Wistar rats were randomly divided into three groups of 10 each, a CIH group, a NAC therapeutic group and a control group. The levels of MDA and SOD were detected by colorimetric method. Immunohistochemistry was used to examine the expression of p-JNK and TUNEL was used to detect the neuron apoptosis in the hippocampal CA1 region. RESULTS: The level of MDA in NAC group were lower than that in CIH group［(1.71±0.43) μmol/g protein vs （1.37±0.26) μmol/g protein, P<0.05)］. The activity of SOD in NAC group was higher than that in CIH group［(44.94±14.01) 103 NU/g protein vs(57.66±14.07) 103 NU/g protein, P<0.05)］. The expression of p-JNK protein and the apoptotic indices ［(0.39±0.16), (0.20±0.11)］ in NAC group were significantly lower than those in CIH group ［(0.53±0.10), (0.32±0.18), all P<0.05］. CONCLUSION: NAC protects hippocampal neuron from apoptosis by suppressing the oxidant stress in the hippocampal CA1 region and inhibiting the activation of JNK signaling pathway.