γH2AX分析技术用于检测CT辐射剂量的初步研究

A Preliminary Study to Detect CT Radiation Doses by Using the γH2AX Focus Formation Assay

应用DNA双链断裂的生物标记物——γH2AX(H2AX组蛋白异型的磷酸化形式)的荧光显像即γH2AX分析技术,通过体外实验研究,了解CT辐射剂量与外周血单个核细胞(PBMCs)中产生的γH2AX荧光点数目的相关性,初步探讨其在检测CT辐射剂量方面的应用前景。观察结果表明,人外周血体外经CT扫描后DNA损伤诱发H2AX活化产生γH2AX,通过荧光显微镜检测到的γH2AX荧光点数目变化与CT扫描的照射剂量之间呈线性正相关,γH2AX分析具有直接作为检测CT辐射剂量的生物学标记的潜力。

To prospectively determine if γH2AX （phosphorylated form of H2AX histone variant）-based visualization and quantification of DNA damage induced in peripheral blood mononuclear cells （PBMCs） can be used to estimate the radiation dose received after multi-detector computed tomography （CT） by the in vitro study, comprehend the correlation between the dose and the induced γH2AX foci, and explore its prospect. The result showed that, DNA damage first presented as γH2AX foci after CT, which can be detected by fluorescence microscope. The γH2AX focus yields linearly depend on the radiation dose after CT. γH2AX focus yield in blood cells may be a useful quantitative biomarker of human radiation exposure by CT scans.