兔脊髓冲击伤后早期Bcl-2、Bax蛋白的表达及意义

目的探讨兔脊髓冲击伤后脊髓组织中Bcl-2、Bax蛋白早期表达的变化规律,为进一步阐明脊髓冲击伤的发生机制和指导临床治疗提供实验依据。方法采用改良型霍普金森杆装置模拟产生冲击波,冲击致伤兔脊髓,同时检测冲击波超压、作用时间及速度,致伤后在不同时间点(4～72h),光镜观察脊髓组织形态学变化,免疫组织化学方法观察Bcl-2和Bax蛋白在脊髓组织的表达。结果兔脊髓冲击致伤时发射系统炮管出口处的冲击波超压峰值、正压持续时间及冲击波速度平均值分别为98.4kPa、2.5ms、512m/s。冲击伤后4～72h,光镜下观察脊髓组织细胞肿胀、坏死改变增多,脊髓灰质的病理损害严重。冲击伤后脊髓灰、白质均有Bcl-2和Bax表达,但在时间分布呈不均一性。Bcl-2在伤后12h呈阳性表达,表达高峰持续在伤后24h～48h,而Bax在伤后4h呈阳性表达,表达高峰也持续在伤后24h～48h,但表达程度始终强于Bcl-2。结论兔脊髓冲击伤后损伤早期局部促进凋亡的因子表达占主导优势,而保护性因子的表达不足,最终使脊髓神经细胞向凋亡的方向发展。

The expression and significance of Bcl-2 and Bax proteins in the early stage of the spinal cord blast injury in rabbit

Objective To observe potential changes in the Bcl-2 and Bax proteins expression in rabbit spinal cord after the blast injury,so as to provide the experimental basis for further clarifying the mechanism of spinal cord blast injury and for clinical therapy. Methods The improved Hopkinson Bar was used to produce blast and the blast pressure and speed were detected by oscilloscope. Light microscopy was used to observe the morphologic changes in rabbit spinal cord and immunochemical method was used to study the ...