摘要
目的:观察西红花苷预处理对急性高海拔低氧条件下大鼠学习记忆能力、海马组织超微结构及SIRT1、PGC-1α表达的影响。方法96只雄性SD大鼠随机分为低氧对照组和低氧给药组,每组48只。低氧给药组每天肌肉注射西红花苷(50 mg/kg)1次,低氧对照组每天肌肉注射相同剂量的生理盐水(0.9% NaCl),连续给药3 d后运至高海拔低氧环境,在第1、3、5、7天观察取材。Morris 水迷宫观察大鼠学习记忆行为,透射电镜观察脑海马神经元超微结构,RT-PCR 方法检测海马SIRT1和PGC-1α的mRNA水平,Western blot检测SIRT1和PGC-1α的蛋白水平。结果与低氧对照组[第1天(37.55±1.34)s,第3天(46.51±6.19)s,第5天(42.12±2.73)s]相比,给药组大鼠在Morris水迷宫实验中的潜伏期[第1天(33.58±2.23)s,第3天(30.19±3.35)s,第5天(37.10±1.48)s]明显缩短(均P<0.05)。低氧对照组大鼠海马组织细胞结构紊乱,线粒体损伤明显,而低氧给药组明显改善。 SIRT1及PGC-1α mRNA相对表达量比较发现,低氧用药组相对表达量[第1天(0.24±0.01),(0.34±0.02);第3天(0.27±0.01),(0.37±0.02);第5天(0.26±0.08),(0.26±0.03)]明显高于低氧对照组[第1天(0.23±0.02),(0.32±0.03);第3天(0.12±0.02),(0.19±0.02);第5天(0.20±0.01),(0.24±0.03)],差异有统计学意义(均P<0.05),而第7天两组相对表达量差异无统计学意义(P>0.05);Western blot法检测SIRT1及PGC-1α蛋白相对表达发现,低氧给药组相对表达量[第1天(0.72±0.02),(0.72±0.02);第3天(0.76±0.03),(0.75±0.02);第5天(0.54±0.03),(0.74±0.01)]明显高于低氧对照组[第1天(0.53±0.04),(0.62±0.04);第3天(0.15±0.02),(0.13±0.02);第5天�
Objective To observe the effect of crocin pretreatment on the learning memory ability, the ultrastructure and SIRT1/PGC-1α expression in hippocampus under hypoxia at high altitude in rats. Methods 96 male SD rats were randomly divided into Hypoxia model group and Hypoxia treatment group with 48 in each.The group rats in treatment group were injected with Crocin once daily(50 mg/kg) and the model group were injected with the same dose of 0.9%NaCl for 3 days,and then they were shifted to high al-titude under hypoxic environment and then the samples were taken at 1 d,3 d,5 d,7 d.Morris water maze test was used to observe learning and memory behaviors of rats.The level of SIRT1/PGC-1αprotein was detected by Western blot and the level of mRNA was detected by RT-PCR.Results Compared with the model group (1d(37.55±1.34)s,3d(46.51±6.19)s,5d(42.12±2.73)s),treatment group showed significant less time in looking for platform in Morris water maze experiment at (1d(33.58±2.23)s,3d(30.19±3.35)s and 5d (37.10±1.48)s;all P〈0.05),and reduced damage in hippocampal tissues of ultrastructure.The results of RT-PCR showed that the mRNA levels of SIRT1 and PGC-1α in hippocampus of rats were higher in treat-ment group (1d(0.24±0.01),(0.34±0.02);3d(0.27±0.01),(0.37±0.02);5d(0.26±0.08),(0.26± 0.03)) than those in model group(1d(0.23±0.02),(0.32±0.03);3d(0.12±0.02),(0.19±0.02);5d(0.20 ±0.01),(0.24±0.03);all P〈0.05),and there was no significant difference at 7d in two groups(P〉0.05). Western blot showed that the protein expression levels of SIRT1 and PGC-1α in hippocampus of rats were higher in treatment group (1d(0.72±0.02),(0.72±0.02);3d(0.76±0.03),(0.75±0.021);5d(0.54± 0.03),(0.74±0.01)) than those in control group (1d(0.53±0.04),(0.62±0.04);3d(0.15±0.02),(0.13± 0.02);5d(0.23±0.03),(0.21±0.02);all P〈0.05),and there was no significant di
出处
《中华行为医学与脑科学杂志》
CAS
CSCD
北大核心
2016年第12期1068-1073,共6页
Chinese Journal of Behavioral Medicine and Brain Science
基金
国家自然科学基金项目(81260685)
青海省科技厅基础研究项目(2016-ZJ-708)