中文摘要：

目的研究富勒烯衍生物C3（以下简称C3）对AHH-1细胞电离辐射的防护效应，探讨该类化合物作为新型辐射防护剂的发展前景。方法通过化学合成制备C3，用台盼兰拒染试验检测C3对AHH-1细胞的毒性作用。在此基础上于AHH-1细胞培养体系中加入不同浓度C3，以不同剂量60^Coγ射线照射细胞，通过台盼兰拒染试验检测C3化合物对细胞的毒性作用，用Annexin—V／PI染色、Facscalibur流式细胞术等，分析C3化合物对γ射线照射细胞增殖活力和细胞凋亡的变化。结果在细胞培养体系中，终浓度范围0～400mg／L的C3对培养的对数生长期AHH-1细胞活力几乎无影响，AHH-1细胞台盼兰拒染率无明显变化（P〉0．05）。C3对1～8Gyγ射线照射的AHH-1细胞具有良好的辐射防护效应，终浓度在10mg／L时即显示其对4Gy60Coγ照射的细胞有保护效应，且随浓度增加而增加；终浓度达200—400mg／L时，照射细胞存活率已接近未照射的正常细胞（P〉0．05），辐射诱导的细胞调亡率和细胞死亡率用药组均显著低于未用药的对照组（P〈0．01）。研究结果还显示，C3提高照射细胞存活率的作用还与给药时间有关，照前24h至照前即刻给药最为有效。结论C3对不同剂量60Coγ射线照射的AHH—1细胞具有较好的电离辐射防护作用，该防护效应与用药浓度有关，C3浓度越高，防护作用越好；且在本实验产生辐射防护作用的浓度范围内，C3对培养的对数生长期AHH-1细胞存活率几乎无影响，提示该类化合物有作为新型辐射防护剂的研究前景。

英文摘要：

Objective To investigate the radio-protective effects of earboxy fullerene C3 （ C3 ） on AHH-1 cell. Methods C3 was prepared by chemical synthesis and trypan blue rejection test was performed to detect the cytotoxicity of AHH-1 cell. Then different concentration of C3 was used to treat AHH-1 ceils radiated with 660Coγ ray. Annexin-V/PI staining and flow cytometry assay were applied to assess the proliferation and apoptosis of cell after irradiation. Results In cell culture system, C3 showed little toxicity to AHH-1 cells with little change of trypau blue rejection rate within the drug concentration range 0 - 400 mg/L （ P 〉 0. 05 ）. We found in this study C3 had good radio-protection effects to AHH-1 cell irradiated with 1 -8 Gy y-ray. When the concentration was 10 mg/L, C3 showed protective effects to AHH-1 cell irradiated with 4 Gy γ-ray, which was enhanced with increasing C3 concentration. When the final concentration reached 200 -400 mg/L, the cell survival rate after irradiation was similar to that of non-irradiated control cell （ P 〉 0. 05 ）. And the in＇adiation induced apoptosis and death rate were significantly lower than those of single irradiated group cells（ P 〈 0. 01 ）. Moreover, the radio-protective effects of C3 were time-dependant, and the best protection effects were observed when the C3 was administered before irradiation （0 -24 h）. Conclusions C3 has good radioprotective effects to AHH-1 cell, which is dose-dependent, and the higher concentration of C3 is, the better protective effect showes. In the effective drag concentration range of this study, C3 does little harm on the survival rate of AHH-1 cell which suggests that C3 as a novel promising radio-protectant deserve to be further investigated.