人弥漫性大B细胞淋巴瘤移植瘤模型的建立及生长特性观察

目的 建立人弥漫性大B细胞淋巴瘤(DLBCL)细胞株LY8裸鼠皮下移植瘤模型并观察其生长特性,为探讨淋巴瘤发病机制及治疗策略提供手段.方法 将人DLBCL细胞株LY8种植于裸鼠右前肢肩胛背侧皮下,成瘤后无菌套管针抽吸法抽取约1.5 mm×1.5 mm×1.5 mm大小组织块进行皮下种植,观察成瘤率和组织形态特点;用免疫组织化学EnVision法观察白细胞共同抗原(LCA)、CD20、CD79α、Ki-67、CD3、CD45RO、bcl-6、MUM-1、CD10、bcl-2等指标的表达;用聚合酶链反应(PCR)扩增检测移植瘤和LY8细胞株的IgH基因克隆性重排和针对3个微卫星位点(D14S68、D18S69、D20S199)的基因组DNA微卫星序列.结果 运用LY8细胞株成功进行了人DLBCL的种植,且生长稳定,已传至第9代,共移植裸鼠124只,其中114只成瘤,成瘤率达91.9%.每代移植瘤的生长特点均相似,于移植后约2周长出,约在3周左右长至最大径1.3 cm,随后即进入快速生长期,4周左右达2.0 cm大小.移植瘤形态符合DLBCL,肿瘤细胞免疫组织化学显色呈LCA、CD20、CD79α、bcl-6、MUM-1、CD10、bcl-2阳性;裸鼠移植瘤与LY8有相同的IgH基因克隆性重排,经3个位点的微卫星引物扩增后获得相同片段的产物.表明移植瘤与人DLBCL细胞相似,并证实了其生长的稳定性和可重复性.结论 建立了可稳定传代的DLBCL的裸鼠模型,为研究人DLBCL的生物学特性及试验治疗提供了较理想的动物模型.

Abstract：

Objective To establish a diffuse large B-cell lymphoma (DLBCL)-mice model using human DLBCL cell line LY8, to investigate its characteristics of growth and to provide a model for in vivo study of DLBCL pathogenesis and treatment. Methods LY8 cells were injected subcutaneously into the right flank of nude mice. Harvested tumor tissues were cut into small pieces of 1.5 mm × 1.5 mm × 1.5 mm and implanted subcutaneously into nude mice. Tumor growth was visualized and the histologic characteristics were documented. Expression of LCA, CD20, CD79α, Ki-67, CD3, CD45RO, bcl-6, MUM-1, CD1O and bcl-2 were examined by using immunohistochemistry. IgH clonal rearrangement and status of three microsatellite loci (D14S68, D18S69, D20S199) in the xenografted tumor samples and the parental cell line LY8 were detected using PCR amplification followed by PAGE. Results The subcutaneous xenograft DLBCL model was successfully established by using cell line LY8, and a stable growth was achieved up to the 9th generation. The tumor in each generation showed similar growth characteristics and the rate of subcutaneous tumor formation was 91.9% (114/124). The tumor growth was observed from the 2nd week after implantation, reaching 1.3 cm in major diameter at the 3rd week and 2. 0 cm at the 4th week. The tumor had identical morphological characteristics with those of human DLBCL, and expressed LCA, CE0,CD79α, bcl-6, MUM-1, CD1O and bcl-2. The tumor of xenograft mice and cell line LY8 showed identical IgH rearrangement and microsatellite length. Conclusions A human DLBCL bearing mouse model was successfully established. The mice model is similar to human counterpart with high stability and repeatability. Therefore, it provides an ideal animal model for in vivo studies of the biological characteristics and treatment of DLBCL.

Establishment and characterization of a nude mice model of human diffuse large B-cell lymphoma

Objective To establish a diffuse large B-cell lymphoma (DLBCL)-mice model using human DLBCL cell line LY8, to investigate its characteristics of growth and to provide a model for in vivo study of DLBCL pathogenesis and treatment. Methods LY8 cells were injected subcutaneously into the right flank of nude mice. Harvested tumor tissues were cut into small pieces of 1.5 mm × 1.5 mm × 1.5 mm and implanted subcutaneously into nude mice. Tumor growth was visualized and the histologic characteristics were documented. Expression of LCA, CD20, CD79α, Ki-67, CD3, CD45RO, bcl-6, MUM-1, CD1O and bcl-2 were examined by using immunohistochemistry. IgH clonal rearrangement and status of three microsatellite loci (D14S68, D18S69, D20S199) in the xenografted tumor samples and the parental cell line LY8 were detected using PCR amplification followed by PAGE. Results The subcutaneous xenograft DLBCL model was successfully established by using cell line LY8, and a stable growth was achieved up to the 9th generation. The tumor in each generation showed similar growth characteristics and the rate of subcutaneous tumor formation was 91.9% (114/124). The tumor growth was observed from the 2nd week after implantation, reaching 1.3 cm in major diameter at the 3rd week and 2. 0 cm at the 4th week. The tumor had identical morphological characteristics with those of human DLBCL, and expressed LCA, CE0,CD79α, bcl-6, MUM-1, CD1O and bcl-2. The tumor of xenograft mice and cell line LY8 showed identical IgH rearrangement and microsatellite length. Conclusions A human DLBCL bearing mouse model was successfully established. The mice model is similar to human counterpart with high stability and repeatability. Therefore, it provides an ideal animal model for in vivo studies of the biological characteristics and treatment of DLBCL.