NMDA受体在海马CA3区习得性TP保持中的作用

The effect of microinjection of 2-amino-5-phosphonovaleric acid (APV), a selective NMDA receptor antagonist, into the rat hippocampal CA3 area on the synaptic efficacy and related conditioned behavior during the acquisition and consolidation of discrimination learning behavior was examined. The results showed: (1) After population spike (PS) amplitude had just increased to the maximum through training i.e. learning-dependent LTP had just formed, APV 1 microliter (2 mmol/L) was injected into CA3 area, then the rats were trained during the time of efficacy of the drug in every experimental block. The result demonstrated that the PS amplitude could not be maintained at the highest level but decreased to the pre-experiment level after 8 blocks. Correct response percentage of rats could not be consolidated with further training but decreased to less than 10%. (2) After the PS amplitude had kept up at the highest level, APV 1 microliter (2 mmol/L) was injected into CA3 area, then the rats were trained during the time of efficacy of the drug in every experimental block, in which case the PS amplitude also could not be maintained at the highest level but decreased to the pre-experiment level after 14 blocks. Correlatively, when the correct response percentage of rats decreased gradually to less than 10%, the conditioned response of the animals extinguished, but its extinction speed was slower than it was in result (1). These results suggest that the NMDA receptor in CA3 area plays an important role in the maintenance of the learning-dependent long-term potentiation.     

NMDA受体在海马CA_3区习得性LTP保持中的作用

在大鼠明暗分辨学习的建立和巩固过程中,通过与记录电极一起慢性埋植于海马CA_3区的注药管微量注射NMDA受体的特异性拮抗剂2-amino-5-phosphonovaleric acid(APV),观察对海马CA_3区突触效应及与之相关的习得性行为的影响。结果如下:(1)在动物经训练PS峰幅值刚增大至最高水平后,即在习得性LTP刚好形成后,每实验单元先于CA_3区注射AFV 1μl(2mmol/L),然后在药物有效作用时间内再进行训练,则PS峰值不能随训练而保持在最高水平,相反经8个实验单元,PS峰值降至实验前水平;相应地动物的正确反应率不能随训练而巩固,反而下降至10％以下。(2)在动物习得性LTP已形成并经一单元训练PS保持在最高水平后,于每实验单元训练前注射APV 1μl(2mmol/L),PS峰值同样不会随训练而保持在最高水平,经14个实验单元注药和训练,PS峰值逐渐降至实验前水平,相应地动物行为的正确反应率也降至10％以下,习得性行为消退,不过其消退速度比前一情况的动物为慢,说明习得性LTP发展情况不同,APV的作用效率有差别。结果表明:NMDA受体在习得性LTP的巩固中起着重要作用。     

不同粘度骨水泥椎体成形术对骨质疏松椎体压缩性骨折的临床疗效及生活质量的影响

目的:比较不同粘度骨水泥椎体成形术(PVP)治疗骨质疏松椎体压缩性骨折(OVCF)的临床疗效及生活质量的影响。方法:回顾性分析于2016年8月至2018年2月期间我院收治的104例OVCF患者的临床资料。将患者按数字表法分为对照组(n=52)和研究组(n=52),两组患者均给予PVP治疗,对照组选用低粘度骨水泥,研究组选用高粘度骨水泥。比较两组患者术前、术后1周、术后1个月、术后3个月、术后6个月及术后12个月的Oswestry功能障碍指数(ODI)评分、疼痛视觉模拟量表(VAS)评分、健康状况调查问卷(SF-36)评分以及Cobb角,记录两组并发症发生情况。结果:研究组患者手术时间长于对照组(P<0.05),而两组患者骨水泥注入量、住院时间比较差异无统计学意义(P>0.05)。两组患者术后1周、1个月、3个月、6个月、12个月ODI评分、VAS评分、Cobb角均较术前降低(P<0.05);两组患者术后1个月、3个月、6个月、12个月ODI评分、VAS评分、Cobb角均较术后1周降低(P<0.05);研究组术后1周、1个月、3个月、6个月、12个月ODI评分、VAS评分、Cobb角低于对照组(P<0.05)。两组患者术后1周、1个月、3个月、6个月、12个月SF-36评分均升高,且研究组高于对照组(P<0.05)。两组并发症发生率比较无统计学差异(P>0.05)。结论:高粘度骨水泥应用于PVP治疗OVCF患者疗效确切,可有效减轻患者疼痛状况,改善生活质量,促进患者恢复。