神经生长因子对新生大鼠缺氧缺血性脑损伤后脑组织Fas/FasL表达的影响

目的探讨神经生长因子对新生大鼠缺氧缺血性脑损伤后(HIBD)脑组织Fas/FasL表达的影响。方法新生7d Wistar乳鼠120只随机分为3组,每组40只:A组(假手术组),B组(缺血缺氧组),C组缺血缺氧+神经生长因子(NGF)]干预组。每组根据处死时间不同又分为5个亚组:6h组,12h组,24h组,48h组,72h组,每组各8只。建立HIBD模型,C组在缺血缺氧后即刻给予腹腔注射NGF(50μg·kg-1·d-1)1次/d,连续3d。各组在不同的时间点取脑组织,假手术组也在相应时间点取脑组织,并用免疫组织化学法测定Fas及FasL含量。结果①Fas的表达:A组脑组织在各个时间点均无或有少量表达;B组脑组织在各个时间点均有Fas的表达,且24～48h为表达高峰,以后逐渐下降;C组脑组织在各个时间点均有Fas的表达,但均较B组表达减少。3组各时间点比较差异均有统计学意义(P<0.01)。②FasL的表达:A组脑组织各个时间点均无表达或有弱表达;B组脑组织在各个时间点都有表达,且24～48h为表达高峰,以后逐渐下降;C组脑组织在各个时间点均有FasL的表达,但均较B组表达减少。3组各时间点比较差异均有统计学意义(P<0.01)。结论①新生大鼠HIBD后6,12,24,48,72h脑组织Fas及FasL表达增加,可能与脑缺氧缺血损伤后神经组织的凋亡有关;②NGF治疗后可明显减少新生大鼠HIBD后脑组织Fas及FasL的表达,从而减少脑组织缺氧缺血损伤后凋亡的发生。

Effects of NGF on Fas and FasL in brain tissue after HIBD in neonatal rats

Objective To explore the effects of NGF on Fas and FasL in brain tissue after HIBD in neonatal rats.Methods A total of 120 seven-day-old Wistar rats were randomly divided into three groups (n=40 each):A group (sham-operated control group),B group (HIBD group),and C group (HIBD + NGF treatment group).Each group were divided into five sub-groups (n=8 each) based on different time points after HIBD (6,12,24,48 and 72 hours).HIBD model was established.Instantly after HIBD,the rats in C group were given peritone...