摘要
目的 研究氯化镧(1anthanumchloride,LaCl3)对大鼠海马即刻早期原癌基因(c-jun)、早期生长反应基因1(early growth response gene1,Egrl)和活性调节细胞骨架基因(activity—regulatedcytoskeletalgene,Arc)表达的影响,探讨LaCl3损害学习记忆能力的机制。方法按完全随机化法将40只Wistar雌性成年大鼠分为对照组和低(0.25%)、中(0.50%)、高(1.00%)LaCl3染毒组,各组雌鼠10只,与5只雄鼠按2:1比例交配。对照组和低、中、高剂量染毒组产仔鼠数分别是80、83、78、75只。各LaCl3染毒组仔鼠断乳前吸吮母乳染镧,断乳后饮用0.25%、0.50%和1.0HD%LaCl3溶液1个月。分别采用跳台试验测试仔鼠学习记忆能力,电感耦合等离子体质谱仪测定海马镧含量,RT—PCR法检测海马c-jun、Egr1和ArcmRNA表达,采用Westernblotting法检测海马c-jun、Egr1和Arc蛋白表达。结果低、中、高剂量组仔鼠在跳台测试时错误次数分别是(1.75±0.71)、(2.38±0.92)、(3.00±0.76)次,中、高剂量组均高于对照组的(1.25±0.46)次(q值分别为4.386、6.793,P值均〈0.05);潜伏期分别为(174.13±33.72)、(139.25±45.83)、(75.50±18.56)S,均低于对照组的(206.754-20.47)S(q值分别为2.958、6.121、11.902,P值均〈0.05)。对照组和低、中、高剂量组仔鼠海马c-junmRNA表达量分别为(0.89±0.08)、(0.77±0.12)、(0.58±0.14)、(0.29±0.11),c-jun蛋白表达量分别为(0.72±0.13)、(0.64±0.11)、(0.43±0.11)、(0.31±0.14),Egr1mRNA表达量分别为(0.78±0.09)、(0.61±0.13)、(0.53±0.10)、(0.22±0.08),Egr1蛋白表达量分别为(0.65±0.18)、(0.40±0.15)、(0.32±0.13)、(0.14±0.09),均与染毒剂量具有剂量一反应关系,相关系数r值分别�
Objective To study influence of lanthanum chloride ( LaCl3 ) on the expression of immediate early genes (lEGs) including e-jun, early growth response gene 1 (Egr1) and activity-regulated eytoskeletal gene ( Arc ) in the hippocampus of rats, and discuss the mechanism of LaCl3 undermining learning and memory capability. Methods Forty female Wistar adult rats were divided into control group, low LaCl3-contaminated group ( 0. 25% ) , medium LaCl3-contaminated group ( 0. 50% ), and high LaCl3-contaminated group ( 1.00% ) by randomized design. Each group had ten female rats along with five male rats and mated by the ratio of 2: 1. The amounts of pups in the above four groups were 80,83,78 and 75 separately. The pups in respective group were La-dyed by lactation, and then the pups in LaCl3-contaminated groups drank 0. 25% ,0. 50% and 1.00% LaCl3 separately for one month. Learning and memory capability of pups were measured in jumping stairs experiment. Hippocampal lanthanum content was determined by inductively coupled plasma mass spectrometry (ICP-MS). Hippocampal c-jun, Egrl and Arc mRNA expression was detected by RT-PCR, and corresponding protein expression was measured by Western blotting method. Results In the jumping stairs experiment, pups in 0.25% , 0. 50% and 1.00% LaCl3-contaminated groups respectively made ( 1.75±0. 71 ), (2. 38±0. 92) and (3.00±0. 76) mistakes; significantly higher than control group ( 1.25 ±0. 46) (q values were d. 386,6. 793 ,P 〈0. 05 ). However, the incubation period of 0. 25% ,0. 50% and 1.00% LaCl3-contamihated groups were ( 174. 13 ± 33.72) , ( 139.25± 45.83 ) and (75.50 ± 18.56) respectively, which were all significantly lower than that of control group (206. 75 ± 20. 47 ) ( q values were 2. 958,6. 121,11. 902, P 〈 0. 05 ). Hippocampal c-jun mRNA expression were (0.89±0.08),(0.77 ±0.12),(0.58 ±0.14) and (0.29±0.10); while the c-jun protein expression were ( 0. 72 ± 0. 13 ), �
出处
《中华预防医学杂志》
CAS
CSCD
北大核心
2011年第4期340-343,共4页
Chinese Journal of Preventive Medicine
基金
国家自然科学基金(30800925)
辽宁省科技厅基金(2005225008-3)
关键词
稀土元素
镧
海马
转录
遗传
Lanthanoid series elements
Lanthanum
Hippocampus
Transcription,genetic