人小肠原发性恶性淋巴瘤裸鼠原位移植模型的建立

目的 建立人小肠原发性恶性淋巴瘤裸鼠原位移植模型,为探讨其发病机制和实验治疗提供工具。方法 将5例人小肠恶性淋巴瘤新鲜组织植入裸鼠小肠黏膜层内,观察原位移植成瘤率和移植瘤的侵袭、转移,并进行形态学(光镜、电镜、免疫组织化学)、染色体核型和流式细胞分析。结果 有3例原位移植获得成功。依据新的WHO恶性淋巴瘤分类标准,建成1株人小肠原发性(非霍奇金B细胞)恶性淋巴瘤裸小鼠原位移植模型(HSIL-1)、1株人小肠原发性(非霍奇金B细胞)恶性淋巴瘤裸小鼠原位移植高转移模型(HSIL-2)和1株人小肠原发性(非霍奇金T细胞)恶性淋巴瘤裸小鼠原位移植模型(HSIL-3)。免疫组织化学显示,HSIL-1和HSIL-2的CD19、CD20、CD22、CD40、CD45、CD72阳性,HSIL-3的CD3、CD7、CD45RO阳性。染色体众数范围55～69条,为亚三倍体核型。移植瘤细胞的DNA指数为1.46～1.71,均为异倍体。HSIL-1、HSIL-2和HSIL-3分别传至32代、27代和21代,共移植裸鼠443只,其肿瘤移植生长率、液氮冻存复苏成活率和自发转移率均为100％。移植瘤在裸鼠小肠内呈侵袭性生长,破坏肠壁各层组织结构,出现血道、淋巴道及种植性转移。原位移植瘤与来源人小肠恶性淋巴瘤细胞一致。结论 3株人小肠原发性恶性淋巴瘤裸鼠原位移植模型完整地模拟了人小肠原发性恶性淋巴瘤患者的临床过程,为研究小肠恶性淋巴瘤的发病机制和实验治疗提供了理想的动物模型。

Establishment and characteristics of orthotopically transplanted model of human primary malignant small intestinal lymphoma in nude mice

OBJECTIVE: To establish orthotopically transplanted model of human malignant small intestinal lymphoma in nude mice and analyze their biologic characteristics. METHODS: Small intestinal lymphoma tissues from 5 patients were transplanted into intestinal mucosa of nude mice. Tumorgenecity, invasion and metastasis of the transplanted tumors were observed by morphological analyses (light microscopy, electron microscopy and immunohistochemistry), karyotyping and DNA quantitative assay. RESULTS: Tumor tissues from 3 lymphoma patients were successfully transplanted. According to the World Health Organization classification, the three models were classified into non-Hodgkin's lymphoma (B cell) of human small intestine (HSIL-1), high metastasis of non-Hodgkin's lymphoma (B cell) of human small intestine (HSIL-2) and non-Hodgkin's lymphoma (T cell) of human small intestine (HSIL-3), respectively. Immunohistochemistry showed that CD19, CD20, CD22, CD40, CD45 and CD72 were positive in HSIL-1 and HSIL-2, whereas CD3, CD7 and CD45RO were positive in HSIL-3. The karyotypes of the transplanted tumors were all hypotriploid with modal numbers from 55 to 69 and the DNA index (DI) was 1.46 approximately 1.71. The three models had been passaged for 32, 27 and 21 generations respectively in 433 nude mice. The growth rate, resuscitation rate of the liquid nitrogen preserved tumor cells and spontaneous metastasis rate upon transplantation were all 100%. We observed an invasive growth of the transplanted tumors in small intestine, which resulted in disrupting of the intestinal wall, hematogenous metastasis, lymph node metastasis and seeding metastasis. The features of the transplanted tumors were similar to the original tumors in histopathology, ultrastructure, DNA content and karyotype. CONCLUSION: Three strains of orthotopically transplanted model of human primary malignant small intestinal lymphoma in nude mice were successfully developed. The result of research will provide ideal animal models for further studies on mechanism of tumorigenesis, invasion and metastasis of malignant small intestinal lymphoma and experimental therapy.