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单宁酸对电离辐射所致巨核细胞损伤的保护作用

, PP. 638-642

Keywords: 单宁酸,巨核细胞,血小板,辐射损伤

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Abstract:

目的研究单宁酸(tannicacid,TA)对电离辐射所致巨核细胞损伤的保护作用,并探讨其作用机制。方法体外培养巨核细胞株M07e,经0、0.5、1、2.5、5、10μg/mL单宁酸预处理后给予10Gy60Coγ射线照射,继续培养不同时间,采用MTT法、荧光酶标仪检测法和流式细胞术检测技术分别检测细胞存活率、活性氧(ROS)水平、线粒体膜电位(mitochondrialmembranepotential,MMP)和凋亡率变化。给予BALB/c小鼠5Gy60Coγ射线全身一次性照射,复制急性放射损伤实验动物模型,设置生理盐水对照组和TA灌胃预处理组,通过尾静脉外周血常规检测和骨髓病理切片观察,分析血小板水平和骨髓巨核细胞数目变化情况。结果TA能够剂量依赖性地提高受照巨核细胞的存活率;与单纯辐照组相比,TA预处理可以显著降低细胞内总ROS水平(P<0.01)、提高细胞线粒体膜电位(P<0.05)和降低细胞凋亡率(P<0.05)。动物实验结果显示,TA预处理能够显著抑制辐射损伤引起的骨髓巨核细胞数量减少,照后第7、12、15、19天时TA处理组血小板水平显著高于对照组(P<0.05,P<0.01)。结论TA对电离辐射所致巨核细胞损伤具有显著保护作用,其作用机制可能与其突出的抗氧化应激活性有关。

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