【摘要】 本研究将辐射后的hprt-AL细胞与未辐射的hprt+AL细胞共培养,通过加有次黄嘌呤氨甲基喋呤胸腺嘧啶(HAT)的培养基选择性杀死被辐射的hprt-AL细胞,探讨了损伤信号在辐射与未辐射细胞间的传导及其机理.研究发现受辐射的hprt-AL细胞能将损伤信号传导给未辐射的hprt+AL细胞,导致其CD59基因位点突变率显著性增加.通过观察DMSO和Lindane对α粒子照射诱发的细胞旁效应的抑制作用发现,在受辐射的共培养实验组中,Lindane能显著提高未辐射细胞的存活率,降低其突变率;DMSO仅能提高其存活率,但对其突变无明显影响,显示细胞间通讯在α粒子照射诱发细胞存活及基因突变旁效应中起重要作用.更多还原

【Abstract】 To investigate signal transduction between irradiated cells and unirradiated cells and its potential mechanism,unirradiated hprt~+A_L cells were co-cultured with irradiated hprt~-A_L cells which were then killed by HAT selected medium.Results show that irradiated hprt~-A_L cells could transmit damage signals to unirradiated hprt~+A_L cells and increase the mutation fraction at the CD59 locus.Free radical scavenger DMSO and intercellular communication inhibitor Lindane significantly increase the survival of unirradiated cells while only Lindane treatment is able to suppress the CD59 mutagenicity in unirradiated cells.These results indicate that GJIC plays an important role in the process of RIBE.更多还原