太空环境对黑色素瘤B16细胞成瘤性的影响

目的观察空间诱变小鼠黑色素瘤B16细胞株的成瘤性，寻找免疫原性发生变异的细胞株。方法将B16细胞株应用细胞低温长期生存系统，搭载于我国第20颗返回式卫星，返地后进行单克隆化，从得到的110株单克隆太空诱变B16细胞株中随机选取4株，常规培养后和对照细胞株同时分别接种C57BL／6J小鼠，腹腔接种组观察生存期，皮下接种组14d后取血、处死，记录瘤重，脾脏重，胸腺重，并进行血清细胞因子检测和瘤体的病理学检测。结果初步确定了适合太空诱变肿瘤细胞株体内筛选实验的方法和筛选指标，并筛选出了1株出瘤时间延迟、瘤重缩小，生存期延长，荷瘤小鼠血清IL-2浓度升高，免疫原性可能发生变异的B16细胞株。结论空间环境可使体外培养肿瘤细胞产生变异，能否通过太空诱变的方法增强肿瘤细胞株的免疫原性需进一步实验验证。

Oncogenesis of melanoma B16 cell clones mutagenized by space environment

Objective To explore the oncogenesis of the melanoma B16 cell clones mutagenized by space environment, and find the B16 cell clones with remarkably mutated immunogenicity. Methods B16 cells were carried by the Chinese 20th recoverable satellite to the outer space, and were harvested after 18 days' spaceflight and then monocloned. Four cell clones, which were randomly selected from the total 110 clones obtained, and the control clone were routinely cultured . The cultured cells were injected to 10 groups of C57BL/6J mice,8-11 mice in each group. Five groups of mice received hypodermic injection and another 5 groups of mice received abdominal injection. The survival time was observed in abdominal injection groups. The mice in hypodermic injection groups were sacrificed after 14 days, the tumor, spleen and thymus were weighted ,and the serum IL-2 concentration was determined. Moreover, the melanoma tumor tissues were examined histopathologically. Results An experiment program suitable to screening space mutagenesis of B16 tumor cell clones in vivo and the observation indices were basically established. One clone was found out which was remarkably different from the control clone in latent period of tumor formation, tumor weight, survival time of the tumor-bearing mice and the expression of IL-2. Conclusions Cultured melanoma B16 cells could be mutated by outer space environment. The further study will be focused on the influence of space environment on immunogenicity of mutagenized B16 cells .;