高压氧对胆红素脑病新生鼠海马神经细胞凋亡和学习记忆的影响

目的 探讨高压氧对胆红素脑病新生大鼠的海马神经细胞凋亡和学习记忆的影响,明确高压氧是否对胆红素的神经毒性有保护作用.方法 5日龄SD大鼠145只,雌雄不限,完全随机法分为3组:生理盐水对照组、胆红素脑病模型组、高压氧十预组.分别于小脑延髓池内注射生理盐水或等量10 mg/ml胆红素溶液,免疫组化法和免疫荧光法分别检测各组海马神经元细胞色素C和Caspase-3表达的动态变化,TUNEL法检测细胞凋亡,水迷宫实验测试学习记忆能力.结果 高压氧干预后海马神经细胞在各时间点,细胞色素C和Caspase-3表达均明显低于模型组,高于对照组(P<0.05);高压氧干预组TUNEL阳性细胞率(27.2±1.8)%明显少于模型组(37.6±6.6)%(P<0.05);水迷宫实验:高压氧干预组在各时间点找到安全平台的潜伏期均明显短于模型组(P<0.05),穿越平台次数是模型组的8倍.结论 高压氧治疗可能通过抑制线粒体途径中细胞色素c和Caspase-3的表达抑制神经细胞凋亡,减轻胆红素对海马神经元的毒性,从而减轻胆红素相关性脑损伤所致的学习记忆障碍.

Hyperbaric oxygenation attenuates hippocampal neuron apoptosis and cognitive impairment in newborn rats with bilirubin encephalopathy

Objective To evaluate the effect of the hyperbaric oxygenation therapy on the apoptosis of the hippocampal neuron and the impairment of cognitive function of the newborn rats suffering from bilirubin encephalopathy. Methods One hundred and forty-five five-day-old SD rats of both sex were randomly divided into 3 groups,control group,bilirubin encephalopathy group and hyperbaric oxygenation treated group. Bilirubin ( 10 mg/ml) was injected into the cerebellomedullary cistern to establish experiment model,and ...