氯化锂改善脆性X染色体智力低下基因1敲除小鼠的旷场行为  

Effects of lithium chloride on open-field behaviors in fragile X mental retardation 1 gene knockout mice

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作  者:张伟雯[1] 孙卫文[2] 杨泉[2] 黄月玲[3] 戴丽军[3] 杨凤啸[1] 陈盛强[2] 孙祺章[4] 

机构地区:[1]广州医科大学附属第三医院检验科,510150 [2]广州医科大学附属第二医院神经内科 [3]广州医科大学实验动物中心 [4]广州医科大学附属脑科医院

出  处:《中华生物医学工程杂志》2014年第4期272-276,共5页Chinese Journal of Biomedical Engineering

基  金:广东省中医药局项目(20131267);广东省科技计划项目(20118080702009)

摘  要:目的 观察氯化锂是否可以改善脆性X染色体智力低下基因1(FMR1)敲除小鼠的旷场异常行为及探讨其可能机制.方法 4周龄FMR1基因敲除小鼠(KO)和野生型小鼠(WT)各90只,按随机数字法各分为对照组(生理盐水)、氯化锂30、60、90、120、200 mg/kg组共6组,每组15只.氯化锂组小鼠连续5d腹腔注射氯化锂.观察对照组和氯化锂组KO与WT小鼠总运动长度、总跨格次数、中央区活动时间以及中央区进入次数等旷场实验行为的差异.采用免疫印迹观察氯化锂对KO与WT小鼠海马和皮层的糖原合酶激酶(GSK)3β和磷酸化(P)-GSK3β的影响.结果 对照组中KO小鼠的总运动长度、总跨格次数、中央区活动时间、中央区进入次数均比WT小鼠多(均P<0.05).与对照组比较,氯化锂5个剂量组KO小鼠旷场实验总运动长度、总跨格次数、中央区活动时间、中央区进入次数均有明显减少(均P<0.05);而WT小鼠用药后总运动长度和中央区活动时间在氯化锂90、120、200 mg/kg剂量组低于对照组(均P<0.05),总跨格次数在氯化锂达到200 mg/kg剂量时才较对照组减少[(75.73±5.12)次比(125.73±9.24)次,P<0.05],中央区进入次数则在氯化锂5个剂量组均低于对照组(均P<0.05).对照组KO小鼠皮层和海马的GSK3β表达量与WT小鼠比较差异没有统计学意义;而P-GSK3β表达量比WT小鼠少(均P<0.05).氯化锂组KO小鼠皮层和海马GSK3β表达与对照组比较差异没有统计学意义,而皮层P-GSK3β的表达在氯化锂120、200 mg/kg组高于对照组(均P<0.05),海马P-GSK3β的表达在氯化锂30 ~ 200 mg/kg 5个剂量组均高于对照组(均P<0.05).氯化锂组WT小鼠皮层和海马GSK3β和P-GSK3β的表达与对照组比较差异均没有统计学意义.使用相同剂量氯化锂的KO小鼠皮层和海马P-GSK3β表达比WT小鼠少(均P<0.05),而GSK3β表达差异没有统计学意义.结论 氯化锂Objective To study the effects and potential mechanisms of lithium chloride on openfield behaviors of fragile X mental retardation 1 gene (FMR1) knockout mice (KO mice).Methods 4-weekold KO mice (n=90) and their wild type counterparts (WT mice,n=90) were,by using random number table,assigned to control group (intraperitoneally injected with normal saline,n=15) and 5 treatment groups intraperitoneally injected with 30 mg/kg (n=15),60 mg/kg (n=15),90 mg/kg (n=15),120 mg/kg (n=15) and 200 mg/kg lithium chloride (n=15) for 5 consecutive days,respectively.The differences in the total length of running,total number of region crossings,and the duration and number of central region crossings of all groups were determined in open field tests.Meanwhile,Western blotting was used to observe the expression of glycogen synthase kinase3β (GSK3β) and phosphorylated glycogen synthase kinase3β (PGSK3β) in the hippocampus and cortex of KO and WT mice.Results KO mice had longer distance of movements,greater total number of region crossings,longer duration and greater number of central region crossings than WT mice (all P<0.05).Compared with control group,administration of lithium chloride resulted in significantly reduced distance of movements,total number of region crossings,shorter duration and smaller number of central region crossings (all P<0.05) in KO mice.Lithium chloride administration (90,120 and 200 mg/kg) was associated with shorter distance of movements and duration of central region crossings in WT mice as compared with control group (all P<0.05).200 mg/kg,but not 30 to 120 mg/kg,lithium chloride led to reduced total number of region crossings compared with control group (75.73±5.12 vs 125.73±9.24,P<0.05).However,lithium chloride administration was associated with a reduced number of central region crossings compared with control group (all P<0.05).No significant difference was found in hippocampus and cortex GSK3β,but not P-GSK3β,

关 键 词:氯化锂 小鼠 基因敲除 脆性X染色体智力低下基因1 旷场行为 脆性X综合征 

分 类 号:R596.1[医药卫生—内科学]

 

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