重离子辐射提高腺病毒介导小鼠黑色素瘤细胞转染率的研究

探讨12C6 离子束辐射对用带有绿色荧光蛋白基因的缺陷性腺病毒(AdCMV-GFP)转染小鼠黑色素瘤细胞(B16细胞系)的影响。采用不同剂量的12C6 重离子束辐射经AdCMV-GFP转染的B16细胞,利用流式细胞仪检测腺病毒的转染率。结果表明,12C6 重离子束辐射能提高腺病毒对B16细胞的转染率,且具有量效关系。此外,先转染后辐射法比起先辐射后转染法能更显著地提高转染率。  

辐射诱导促进AdCMV-p53转染前列腺癌细胞

用腺病毒重组体(AdCMV-p53/GFP)转染经0.5,1.0和2.0Gyγ射线辐射处理的前列腺癌细胞[PC-3(nullp53)],用克隆形成法检测细胞增殖能力,用流式细胞分析法测定腺病毒重组体转染率和外源性p53蛋白表达。结果提示,辐射诱导使腺病毒重组体转染PC-3细胞提高7%—39%。辐射联合AdCMV-p53转染组p53表达水平提高18.5%—35.4%。与单纯AdCMV-p53转染组和单纯辐射组相比,辐射联合AdCMV-p53转染组细胞存活率分别降低25%—64%和22%—65%。  

辐射诱导的DNA修复与细胞凋亡的ATP调控

综述了DNA辐射损伤导致的细胞阻遏于G1期以及在该时期对DNA的修复活动，提出了较大剂量辐射诱导的三磷酸腺苷不足导致细胞凋亡的假说，并分析了细胞走向凋亡与修复的辨正关系。  

Rotating wheel filter design and optimization for a uniform depth dose distribution in heavy ion therapy

Treatment planning of heavy-ion radiotherapy involves predictive calculation of not only the physical dose but also the biological dose in a patient body. The goal in designing beam-modulating devices for heavy ion therapy is to achieve uniform biological effects across the spread-out Bragg peak (SOBP). To achieve this, a mathematical model of Bragg peak movement is presented. The parameters of this model have been resolved with Monte Carlo method. And a rotating wheel filter is designed basing on the velocity of the Bragg peak movement.