脑胶质瘤SHG-44细胞株照射后子代辐射敏感性

目的 探讨脑胶质瘤SHG-44细胞株照射子代生长特性及辐射敏感性变化。方法 培养人脑胶质瘤SHG-44细胞株照射后的存活子代细胞,测定其群体倍增时间,并进行集落形成实验和流式细胞仪检测,分析其辐射敏感性和细胞周期变化。结果 SHG-44细胞群体倍增时间为(22.78±2.61) h,SHG-44细胞经6 MV X射线10 Gy照射后存活子代SHG-44.10细胞群体倍增时间为(30.46±2.73) h (F=7.878,P<0.05)。SHG-44细胞和SHG-44.10细胞再次2 Gy照射后的存活分数分别为70.8%、80.6%。与SHG-44细胞相比,SHG-44-10细胞在G2/M期比例减少,S期比例增多。结论 SHG-44细胞照射后存活子代细胞增殖延缓,辐射敏感性下降。

Radiosensitivity of filial generation from irradiated human glioma cell line SHG-44

Objective To investigate the radiosensitivity and growth features of the progeny of irradiated human glioma cell line SHG-44.Methods The SHG-44 cells were irradiated with 6 MV X ray and the progeny of the cells were cultured.The population doubling time (PDT) was detected pre-and post-irradiation.The radiosensitivity of the progeny of irradiated human glioma cell line SHG-44 was measured by clone forming assay.The cell cycle distribution was analysed by flow cytometry.Results The PDT of SHG-44 cells before irradiation was (22.78±2.61) h.The PDT of irradiated SHG-44 cells at dose of 10 Gy were (30.46±2.73) h (F=7.878,P<0.05).The surviving fraction of SHG-44 cell was 70.8%,SHG-44-10 cell was 80.6%.SHG-44 cells showed significant GriM phase decrease and S phase arrest after irradiation.Conclusion Growth delay and declined radiosensitivity are confirmed in the progeny of irradiated SHG-44 cells.