In the present study, 7 day postnatal C57/BL6 wild-type mice （hyperoxia group） and 7 day postnatal N-methyI-D-aspartate receptor subtype 3A knockout mice （NR3A KO group） were exposed to 75% oxygen and 15% nitrogen...In the present study, 7 day postnatal C57/BL6 wild-type mice （hyperoxia group） and 7 day postnatal N-methyI-D-aspartate receptor subtype 3A knockout mice （NR3A KO group） were exposed to 75% oxygen and 15% nitrogen in a closed container for 5 days. Wild-type mice raised in normoxia served as controls. TdT-mediated dUTP nick end labeling （TUNEL）/neuron-specific nuclear protein （NeuN） and 5-bromo-2＇-deoxyuridine （BrdU）/NeuN immunofluorescence staining showed that the number of apoptotic cells and the number of proliferative cells in the dentate subgranular zone significantly increased in the hyperoxia group compared with the control group. However, in the same hyperoxia environment, the number of apoptotic cells and the number of proliferative cells significantly decreased in the NR3A KO group compared with hyperoxia group. TUNEL＋/NeuN＋ and BrdU＋/NeuN~ cells were observed in the NR3A KO and the hyperoxia groups. These results demonstrated that the NR3A gene can promote cell apoptosis and mediate the potential damage in the developing brain induced by exposure to non-physiologically high concentrations of oxygen.展开更多
目的:通过观察低频电针对海洛因心理依赖小鼠海马N-甲基-D-天冬氨酸(NMDA)的亚型NMDAR1(NR1)、NM-DAR-2A(NR2A)、NMDAR-2B(NR2B)表达的影响,探讨低频电针对海洛因成瘾记忆干预作用的可能中枢机制。方法:筛选无天然位置偏爱的雄性小鼠45...目的:通过观察低频电针对海洛因心理依赖小鼠海马N-甲基-D-天冬氨酸(NMDA)的亚型NMDAR1(NR1)、NM-DAR-2A(NR2A)、NMDAR-2B(NR2B)表达的影响,探讨低频电针对海洛因成瘾记忆干预作用的可能中枢机制。方法:筛选无天然位置偏爱的雄性小鼠45只,随机分为对照组、海洛因心理依赖模型组(模型组)、模型电针组(模针组),每组15只。海洛因剂量递增注射结合条件性位置偏爱(conditioned place preference,CPP)训练制作海洛因心理依赖模型,2Hz低频电针"内关"、"三阴交",点刺"四神聪"穴。采用白箱CPP值变化评价低频电针治疗效应,免疫组化方法检测海马NMDA受体亚型(NR1、NR2A、NR2B)的表达。结果:①模针组白箱CPP值较模型组明显降低(P<0.05)。②模针组小鼠NR1、NR2B阳性表达较模型组增强(P<0.05)。③模针组小鼠NR2A阳性表达较模型组降低(P<0.05)。结论:低频电针疗法能增强海洛因心理依赖小鼠海马NR1、NR2B,降低NR2A的阳性表达。这种改变可能与低频电针调节海洛因依赖的机制有关。展开更多
基金supported by the National Institutes of Health, USA, No. NS 045810, NS 057255the BasicClinical Scientific Research Foundation Program of the Capital Medical University, China, No. 2006JL19
文摘In the present study, 7 day postnatal C57/BL6 wild-type mice （hyperoxia group） and 7 day postnatal N-methyI-D-aspartate receptor subtype 3A knockout mice （NR3A KO group） were exposed to 75% oxygen and 15% nitrogen in a closed container for 5 days. Wild-type mice raised in normoxia served as controls. TdT-mediated dUTP nick end labeling （TUNEL）/neuron-specific nuclear protein （NeuN） and 5-bromo-2＇-deoxyuridine （BrdU）/NeuN immunofluorescence staining showed that the number of apoptotic cells and the number of proliferative cells in the dentate subgranular zone significantly increased in the hyperoxia group compared with the control group. However, in the same hyperoxia environment, the number of apoptotic cells and the number of proliferative cells significantly decreased in the NR3A KO group compared with hyperoxia group. TUNEL＋/NeuN＋ and BrdU＋/NeuN~ cells were observed in the NR3A KO and the hyperoxia groups. These results demonstrated that the NR3A gene can promote cell apoptosis and mediate the potential damage in the developing brain induced by exposure to non-physiologically high concentrations of oxygen.
文摘目的:通过观察低频电针对海洛因心理依赖小鼠海马N-甲基-D-天冬氨酸(NMDA)的亚型NMDAR1(NR1)、NM-DAR-2A(NR2A)、NMDAR-2B(NR2B)表达的影响,探讨低频电针对海洛因成瘾记忆干预作用的可能中枢机制。方法:筛选无天然位置偏爱的雄性小鼠45只,随机分为对照组、海洛因心理依赖模型组(模型组)、模型电针组(模针组),每组15只。海洛因剂量递增注射结合条件性位置偏爱(conditioned place preference,CPP)训练制作海洛因心理依赖模型,2Hz低频电针"内关"、"三阴交",点刺"四神聪"穴。采用白箱CPP值变化评价低频电针治疗效应,免疫组化方法检测海马NMDA受体亚型(NR1、NR2A、NR2B)的表达。结果:①模针组白箱CPP值较模型组明显降低(P<0.05)。②模针组小鼠NR1、NR2B阳性表达较模型组增强(P<0.05)。③模针组小鼠NR2A阳性表达较模型组降低(P<0.05)。结论:低频电针疗法能增强海洛因心理依赖小鼠海马NR1、NR2B,降低NR2A的阳性表达。这种改变可能与低频电针调节海洛因依赖的机制有关。
