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Correlation of changes of peripheral benzodiazepine receptors in hippocampus synaptosomes with cognitive impairment: experiment with D-galactose-induced senescent rats
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- Author:
- No author available
- Journal Title:
- NATIONAL MEDICAL JOURNAL OF CHINA
- Issue:
- 21
- DOI:
- 10.3760/j:issn:0376-2491.2006.21.008
- Key Word:
- 海马;突触体;外周型苯二氮革受体;D-半乳糖;学习记忆;大鼠
Abstract： 目的观察海马突触体外周型苯二氮革受体(PBR)水平对大鼠空间学习和记忆能力的影响.方法SD大鼠随机分为对照组和D-半乳糖组.D-半乳糖组动物连续皮下注射D-半乳糖(100mg/kg,每日1次)56次,对照组注射生理盐水.利用Morris水迷宫测试动物学习记忆能力后制备海马突触体,测定PBR最大结合容量(Bmax)和平衡解离常数(KD).结果与对照组比较,D-半乳糖组动物学习记忆能力降低(P＜0.001),KD无显著变化.D-半乳糖组Bmax(177.2 fmol/mg±26.7fmol/mg)低于对照组(296.7 fmol/mg±33.5 fmol/mg)(P＜0.001),海马突触体[3H]PK11195特异性结合活性与迷宫试验动物逃避潜伏期(r=-0.854)、平台象限游泳时间(r=0.845)及距离(r=0.851)显著相关(P＜0.001).结论海马突触体PBR表达量可能与大鼠空间学习和记忆有关.
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