NF-κB在发育鼠戊四氮反复点燃癫痫形成中的作用

目的：用NF-κB阻滞剂吡咯烷二硫基甲酸盐(PDTC)阻断NF-κB的表达，探讨核因子κB(NF-κB)在发育鼠戊四氮(PTZ)点燃癫痫形成过程中的作用。方法:生后10 d（P10）Wistar大鼠72只，随机分为PTZ组、PDTC＋PTZ组及生理盐水对照组3组，制备戊四氮反复点燃癫痫模型。观察各组大鼠行为学改变、海马各区细胞形态及细胞计数、NF-κB表达、5-溴-2-脱氧尿嘧啶核苷(BrdU)阳性细胞数和苔藓纤维发芽等指标。结果:(1)NF-κB表达，PTZ组显著高于对照组及PDTC+PTZ组（P<0.01）；(2)海马神经细胞计数，PTZ组齿状回（DG）区颗粒细胞较对照组显著增加(P<0.05)；PDTC+PTZ组CA1、CA3和门区神经元数较PTZ组均明显减少（P<0.05）；(3)DG区BrdU阳性细胞数，PTZ组和PDTC+PTZ组均较对照组显著增加（P<0.01）；PDTC＋PTZ组DG区BrdU阳性细胞数目明显较PTZ组少（P<0.01）；NF-κB吸光度值与BrdU阳性细胞数/颗粒细胞数相关性分析呈正相关，具有统计学意义（P<0.01）；（4）苔藓纤维发芽，PDTC＋PTZ组和PTZ组均有苔藓纤维发芽，两组比较没有显著差异。结论:NF-κB在发育鼠癫痫中发挥重要作用，促进海马神经元发生，保护海马神经细胞，但对苔藓纤维发芽无明显作用。

Role of NF-κB in pentetrazole-induced repeated seizure in developing rats

AIM:To investigate the role of NF-κB in pentetrazole-induced repeated seizure in developing rats with the inhibitor of NF-κB pyrrolidine dithiocarbamate (PDTC). METHODS:10-day-old Wistar rats (n=72) were prepared for epilepsy model and divided into three groups at random: the PTZ group, the PDTC+PTZ group and the control group. The behavioral changes, the cells morphology and neurons counts in hippocampus, the expression of NF-κB, BrdU (5-bromo, 2-deoxyuridine) immunoreactive cells in hippocampus and the mossy fiber sprouting were observed.RESULTS:(1) The NF-κB expressed in PTZ group was significantly higher than that in PDTC+PTZ group and control group (P<0.01). (2) The dentate gyrus granule cell count in PTZ group was significantly higher than that in control group (P<0.05). In PDTC+PTZ group cell counts in CA1, CA3 and hilar region were significantly lower than those in PTZ group (P<0.05). (3) The BrdU-immunoreactive cells counts in dentate gyrus in PTZ group and PDTC+PTZ group were significantly higher than those in control group (P<0.01), but in PDTC+PTZ group BrdU-immunoreactive cell count was significantly lower than that in PTZ group (P<0.01). Correlate analyzes between NF-κB expression and BrdU-immunoreactive cell counts/granule cell counts showed positive correlation (P<0.01). (4) The mossy fiber sprouting in both PTZ and PDTC+PTZ group was observed. However, the degrees of sprouting showed no significant differences between two groups. CONCLUSION:NF-κB plays a crucial role in epilepsy of developing rats. It encourages neurogenesis and protects neurons in hippocampus, but has no significant effect on mossy fiber sprouting.