犬颅脑枪弹伤后局部脑组织c-fos基因表达

C-fos gene expression in local cerebral tissues of canines following craniocerebral gunshot wounds

目的 探讨犬颅脑枪弹伤后c -fos基因表达及其变化规律 ,为进一步了解火器性颅脑损伤的机制提供实验基础。 方法 以德国小口径步枪子弹致伤犬颅脑贯通伤模型为对象 ,采用免疫组化法检测对照组脑组织及伤后不同时间弹道挫伤区、震荡区及脑干神经元中c -fos基因的表达。 结果 对照组脑皮层神经元中c -fos基因呈弱表达 ,弹道挫伤区、震荡区及脑干神经元中c-fos基因表达于伤后 30min开始增加 ,2h达到高峰 ,3h逐渐下降 ,且c -fos基因表达在弹道震荡区较挫伤区更为明显 (P <0 .0 5 )。 结论 犬脑组织弹道挫伤区、震荡区及脑干神经元中c-fos基因表达是对损伤刺激的早期反应 ,其表达可能是由Leao播散性抑制引起 ,并与细胞内外信号转导和细胞凋亡有关。

Objective To study the gene expression and the expression change rule of c-fos in the canines posterior to craniocerebral gunshot wounds in order to provide the experimental base for further understanding of the mechanism of gunshot craniocerebral injury. Methods Using the canine model of penetrating craniocerebral injury made by the bullets of the small-calibre rifle made in Germany, the c-fos expressions in the control cerebral tissues and the contusion and concussion areas of the trajectory and the brain stem neurons at different time points after trauma were observed by immunohistochemical method. Results Feeble c-fos expression was detected in the control group. After craniocerebral gunshot wounds, the c-fos expression increased in the contusion and concussion areas of the trajectory and in the brain stem at the 30th minutes, reached the peak at the 2nd hour and began to decrease at the 3rd hour. The c-fos expression in the concussion area was much more significant than that in the contusion area ( P <0.05). Conclusions The c-fos expression in the contusion and concussion areas of the trajectory and the brain stem is the early response to the injury stimulation, may be caused by the Leao's spreading depression (SD) and associates with the signal transduction inside and outside the cells and the cell apoptosis.