Sprague-Dawley neonatal rats within 7 days after birth were used in this study. The left common carotid artery was occluded and rats were housed in an 8% O2 environment for 2 hours to establish a hypoxic-ischemic brai...Sprague-Dawley neonatal rats within 7 days after birth were used in this study. The left common carotid artery was occluded and rats were housed in an 8% O2 environment for 2 hours to establish a hypoxic-ischemic brain damage model. 17β-estradiol （1 × 10-5 M） was injected into the rat abdominal cavity after the model was successfully established. The left hemisphere was obtained at 12, 24, 48, 72 hours after operation. Results showed that malondialdehyde content in the left brain of neonatal rats gradually increased as modeling time prolonged, while malondialdehyde content of 17β-estrodial-treated rats significantly declined by 24 hours, reached lowest levels at 48 hours, and then peaked at 72 hours after injury. Nicotinamide-adenine dinucleotide phosphate histochemical staining showed the nitric oxide synthase-positive cells and fibers dyed blue/violet and were mainly distributed in the cortex, hippocampus and medial septal nuclei. The number of nitric oxide synthase-positive cells peaked at 48 hours and significantly decreased after 17β-estrodial treatment. Our experimental findings indicate that estrogen plays a protective role following hypoxic-ischemic brain damage by alleviating lipid peroxidation through reducing the expression of nitric oxide synthase and the content of malondialdehyde.展开更多
目的:探讨血清神经元特异性烯醇化酶(neuron specific enolasc,NSE)、髓鞘碱蛋白(myelin base protein,MBP)与血清游离钙(Ca2+)的水平变化在新生儿缺氧缺血性脑病(HIE)中的意义。方法:选择足月HIE患儿82例为实验组,分别在1天、3天(急性...目的:探讨血清神经元特异性烯醇化酶(neuron specific enolasc,NSE)、髓鞘碱蛋白(myelin base protein,MBP)与血清游离钙(Ca2+)的水平变化在新生儿缺氧缺血性脑病(HIE)中的意义。方法:选择足月HIE患儿82例为实验组,分别在1天、3天(急性期),7天(恢复期)采血,用放免法测定NSE,用ELISA法测定MBP,日本产AFT-500型血液电解质分析仪测定血清Ca2+,30例健康新生儿作为正常对照组。结果:①HIE各组1天,3天血清NSE水平均高于对照组(P<0.05),且HIE程度越重,NSE水平越高。NSE水平以生后1天最高,3天后开始下降,轻度H1E患儿7天后基本恢复正常,而中、重度HIE患儿仍保持较高水平。②重度组HIE患儿3天MBP水平升高最明显,7天其水平下降,但仍高于对照组,生后7天轻、中度HIE组与对照组相比无明显差异。③1天、3天轻、中、重度HIE组血清Ca2+浓度较对照组有显著差异(P<0.05),病情越重,下降越明显,生后7天轻度H1E组血清Ca2+浓度恢复正常,而中、重度HIE组仍低于对照组。结论NSE是一个较为敏感的反映神经元损伤的指标,联合检测MBP、Ca2+能更好地判断病情轻重,评估预后。展开更多
基金supported by the Project of Nantong Application Plan,No.BK2011055the Project of Nantong University,No.09Z032
文摘Sprague-Dawley neonatal rats within 7 days after birth were used in this study. The left common carotid artery was occluded and rats were housed in an 8% O2 environment for 2 hours to establish a hypoxic-ischemic brain damage model. 17β-estradiol （1 × 10-5 M） was injected into the rat abdominal cavity after the model was successfully established. The left hemisphere was obtained at 12, 24, 48, 72 hours after operation. Results showed that malondialdehyde content in the left brain of neonatal rats gradually increased as modeling time prolonged, while malondialdehyde content of 17β-estrodial-treated rats significantly declined by 24 hours, reached lowest levels at 48 hours, and then peaked at 72 hours after injury. Nicotinamide-adenine dinucleotide phosphate histochemical staining showed the nitric oxide synthase-positive cells and fibers dyed blue/violet and were mainly distributed in the cortex, hippocampus and medial septal nuclei. The number of nitric oxide synthase-positive cells peaked at 48 hours and significantly decreased after 17β-estrodial treatment. Our experimental findings indicate that estrogen plays a protective role following hypoxic-ischemic brain damage by alleviating lipid peroxidation through reducing the expression of nitric oxide synthase and the content of malondialdehyde.
文摘目的:探讨血清神经元特异性烯醇化酶(neuron specific enolasc,NSE)、髓鞘碱蛋白(myelin base protein,MBP)与血清游离钙(Ca2+)的水平变化在新生儿缺氧缺血性脑病(HIE)中的意义。方法:选择足月HIE患儿82例为实验组,分别在1天、3天(急性期),7天(恢复期)采血,用放免法测定NSE,用ELISA法测定MBP,日本产AFT-500型血液电解质分析仪测定血清Ca2+,30例健康新生儿作为正常对照组。结果:①HIE各组1天,3天血清NSE水平均高于对照组(P<0.05),且HIE程度越重,NSE水平越高。NSE水平以生后1天最高,3天后开始下降,轻度H1E患儿7天后基本恢复正常,而中、重度HIE患儿仍保持较高水平。②重度组HIE患儿3天MBP水平升高最明显,7天其水平下降,但仍高于对照组,生后7天轻、中度HIE组与对照组相比无明显差异。③1天、3天轻、中、重度HIE组血清Ca2+浓度较对照组有显著差异(P<0.05),病情越重,下降越明显,生后7天轻度H1E组血清Ca2+浓度恢复正常,而中、重度HIE组仍低于对照组。结论NSE是一个较为敏感的反映神经元损伤的指标,联合检测MBP、Ca2+能更好地判断病情轻重,评估预后。
