系统阐述了与金纳米粒子(GNPs)放射增敏效应相关实验的方法与结果、影响GNPs放射增敏的因素、GNPs放射增敏的细胞和动物实验表现及其相关机制。同时结合相关实验，分析和比较了15 nm柠檬酸钠包被的GNPs的放射增敏效应，发现GNPs在高LET的碳离子束和低LET的X射线辐照下对Hela细胞的杀伤力随其浓度的增加而增大；在50%的细胞存活率下，当GNPs的质量浓度为7.5μg/mL时，其X射线的剂量减少率和碳离子的相对生物学效应值(RBE)的增加率达到了最大，分别为65.3%和43.6%，同时GNPs共培养细胞24和48 h后，未出现细胞周期同步化的现象。
This paper describes the methods and results of the previous experiments, the experimental phe-nomena of the cell and animal tests and the relative mechanisms on the radiosensitizing effect of GNPs. Together with our experiments, the radiosensitizing effects of 15 nm citrate-capped GNPs and related mechanisms are ana-lyzed and compared, finding that Hela cell killing of GNPs increase along with their concentration after exposure to high- and low-LET radiation such as carbon ions and X-rays. In addition, the percentages of dose reduction of the X-rays and RBE increment of the carbon ions reached their maximums 65.3% and 43.6%, respectively, at 50% survival level when Hela cells were pre-treated with 7.5 μg/mL GNPs. Moreover, Hela cells showed no cell-cycle synchronization after 24 and 48 h exposure to GNPs.
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