槲皮素对缺氧缺血性脑白质损伤新生大鼠学习记忆能力的影响

Effects of quercetin on the learning and memory ability of neonatal rats with hypoxic-ischemic brain damage

摘要:

目的：研究槲皮素(QUE，黄酮类化合物) 对缺氧缺血性脑白质损伤新生大鼠学习记忆能力的影响。方法：生后3 d Sprague-Dawley（SD）大鼠60只，随机分成对照组、模型组和QUE处理组（20 mg/kg 和40 mg/kg），每组15只。模型组和QUE处理组行右侧颈总动脉结扎及缺氧处理以建立缺血缺氧性脑白质损伤模型。QUE处理组每日给药一次，连续6 周。第6周时分别用Morris水迷宫及开场试验评价其学习记忆能力和行为情感。结果：从训练的第2天开始，模型组逃避潜伏时间（EL）明显长于对照组（P<0.01）， 20和40 mg/kg QUE处理组EL明显短于模型组（P<0.05）。模型组大鼠穿越原平台次数明显低于对照组（P<0.01）及两个QUE组（P<0.05）。开场试验显示，模型组大鼠后肢站立次数较对照组增加，中央区域驻留时间较对照组延长，QUE处理后大鼠后肢站立次数较模型组明显减少（P<0.05），中央区域驻留时间明显缩短（P<0.05）。结论：QUE可以明显改善缺血缺氧性脑白质损伤新生大鼠的学习记忆及行为情感障碍，对中枢神经系统脑白质损伤具有保护作用。

Abstract:

OBJECTIVE: To study the effects of quercetin, a flavonoid, on the learning and memory ability of 3-day-old neonatal rats with hypoxic-ischemic brain white matter damage (WMD). METHODS: Sixty 3-day-old Sprague-Dawley rats were randomly divided into four groups: control, WMD model,and quercetin treatment groups (20 and 40 mg/kg). There were 15 rats in each group. Rats in the WMD model and the two quercetin treatment groups were subjected to right common carotid artery ligation followed by 2 hrs of exposure to 8% O2 to induce periventricular white matter injury. After the operation quercetin was administered daily in the two quercetin treatment groups for 6 weeks. Six weeks later, Morris water maze and open-field tests were carried out to test memory and learning ability as well as behavior and cognition. RESULTS: From the second day of training, escape latency in the Morris water maze test was more prolonged in the WMD model group than in the control group (P<0.01). The escape latency in the two quercetin treatment groups was shortened significantly compared with the WMD model group (P<0.05). The WMD model group crossed the original platform fewer times compared with the control and quercetin treatment groups (P<0.05). The open-field test indicated that the number of rearings increased and time spent in the centre was extended in the WMD model group compared with the control group. Compared with the WMD model group, the number of rearings was significantly reduced (P<0.05) and time spent in the centre was significantly shortened in the quercetin treatment groups (P<0.05). CONCLUSIONS: Quercetin treatment can improve memory and learning ability as well as cognitive ability in neonates with WMD, suggesting that quercetin protects against WMD resulting from hypoxia-ischemia.