2,5-己二酮对大鼠运动及感觉神经元神经生长因子表达的影响

Effects of 2,5-Hexanedione on NGF expression in motor and sensory neuronal cells of rats

目的 研究正己烷的代谢产物2 ,5 己二酮对大鼠神经系统运动、感觉神经元内源性神经生长因子(NGF)表达的影响。方法 采用原代培养的大鼠背根神经节(DRG)感觉神经元和培养的大鼠脊髓前角运动神经元瘤细胞系VSC4 - 1细胞,用相差显微镜观察细胞形态,同时用免疫组化方法分析不同浓度2 ,5 HD(2 . 5、5 . 0、10 . 0、2 0 . 0mol L)染毒2 4小时后DRG、VSC4 1细胞内NGF含量的变化。结果 与对照组相比,2 ,5 己二酮染毒剂量为5 . 0、10 . 0、2 0 . 0mmol L时,皆可使DRG细胞及VSC4 1细胞NGF表达量显著下降(P <0 . 0 5 ) ;各剂量组间两两比较发现随着染毒剂量增高,两类细胞NGF表达水平的下降有愈为明显的趋势。结论 2 ,5 己二酮可降低大鼠DRG感觉神经元和脊髓前角运动神经元(VSC4 . 1细胞)、内源性NGF的表达水平,并进一步抑制了两类细胞的生长与存活。

Objective To investigate the effects of 2,5-Hexanedione (2,5-HD),a metabolite of n-hexane,on nerve growth factor(NGF) expression in motor and sensory neuronal cells of peripheral nervous system of rats. Methods Primary cultured dorsal root ganglion (DRG) neurons were obtained from new born rats on day 4. The cell line VSC4.1 were cultured. The growth condition of cells were observed with a phase contrast microscope. Immunohistochemistry technology was used to analyze the NGF expression in both VSC4.1 cells and primary cultured DRG cells treated with 4 different dosages of 2,5-HD(2.5,5.0,10.0,20.0mmol/L)respectively for 24 hours. Results The NGF expression decreased significantly in both DRG neurons and VSC4.1 cells dosed respectively with 5.0,10.0,20.0 mmol/L 2,5-HD in comparison with the control group(P<0.05), with a tendency of dose-effect correlation. Conclusion The results suggested that 2,5-HD can decrease the endogenous NGF levels in both cultured DRG sensory neurons and VSC4.1 motor neuron cells of rats.