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Fast Neutron Irradiation Induces Regionally Specific Activation of TRAIL/DR5 Pathway in Rat Brain

机译:快节奏辐照诱导大鼠脑中的迹线/ DR5途径的区域特异性活化

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Object To explore the effects of neutron-irradiation exposure on TRAIL/DR5 pathway in rat brain regions. Methods Fast neutron-irradiation was employed as the irradiated model. The expression changes of TRAIL and DR5 in cerebral cortex, hippocampus, cerebellum and corpus striatum were detected after 1, 7 and 14 d post-irradiation by RT-PCR, ELISA and western blotting. Cleaved caspase-8 was examined by western blotting. Results In protein expression level, TRAIL was increased in the four regions to different extents after 7 d and then recovered after 14 d; DR5 was detected to be up-regulated in cerebral cortex, hippocampus and corpus striatum but down-regulated in cerebellum after 14 d post-irradiation. No significant changes of TRAIL and DR5 were observed in RNA level by RT-PCR. The cleaved caspase-8 was up-expressed the greatest after 1 d in cerebral cortex, hippocampus and cerebellum but continually up-regulated in corpus striatum from 1 to 14 d after irradiation treatment. Conclusion TRAIL was induced in rat brain at early stage while the expression changes of DR5 were delayed by neutron-irradiation and vary in different brain regions. Moreover, caspase-8 was not activated in accord with the changes of TRAIL and DR5 in some brain regions. These indicate that the activation of TRAIL/DR5 pathway plays a role in irradiation-induced injury, which is regulated in a region-specific and time-dependent manner.
机译:目的探讨中子辐射暴露对大鼠脑区径迹/ DR5途径的影响。方法采用快节中子辐射作为辐照模型。通过RT-PCR,ELISA和Western印迹后1,7和14d检测到脑皮质,海马,小脑和语料纹状体中的TRAIL和DR5的表达变化。通过蛋白质印迹检查切割的Caspase-8。结果蛋白质表达水平,在7天后的四个区域中的四个区域增加了痕迹,然后在14 d后回收;检测到DR5在脑皮质,海马和粒状纹状体上上调,但在辐射后14 d后的小脑中下调。 RT-PCR在RNA水平中没有观察到TRAIL和DR5的显着变化。在脑皮质,海马和小脑中,在脑皮质,海马和小脑中,在脑皮质,海马和小脑中的最大,在辐照处理后,在脑皮层,海马和小脑中持续上调,在脑皮层和小脑中持续上调。结论在早期在大鼠大脑中诱导痕迹,而DR5的表达变化被中子辐射延迟,不同脑区变化。此外,Caspase-8并未符合某些大脑区域的TRAIL和DR5的变化。这些表明,TRAIL / DR5途径的激活在辐照诱导的损伤中起作用,其以特定于区域和时间依赖的方式调节。

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