原位移植体内连续筛选法建立人胃恶性淋巴瘤裸小鼠高转移模型系统

目的 建立侵袭和转移潜能不同的人胃恶性淋巴瘤裸鼠原位移植高转移模型系统.方法 将外科手术切除的人原发性胃恶性淋巴瘤原发灶和肝转移灶新鲜瘤组织块分别植入裸小鼠胃壁黏膜下层内,通过鼠间连续原位传代技术筛选高转移和特异器官转移瘤株.观察原位移植的成瘤率、移植瘤的侵袭、转移特性,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 人胃恶性淋巴瘤原发灶和肝转移灶新鲜组织均移植成功,建立了两株转移生物学特性不同的人胃(肝转移灶)恶性淋巴瘤裸鼠原位移植肝转移模型(HGBL-0304)和人胃(原发灶)恶性淋巴瘤裸鼠原位移植高转移模型(HGBL-0305).移植瘤组织病理学为胃弥漫大B细胞淋巴瘤.两株模型分别传至45代,共移植裸鼠419只,其中肿瘤移植生长率和液氮冻存复苏成活率均为100%.在转移时间、器官转移率、肝转移程度和宿主生存期上两株模型差异有统计学意义.HGBL-0304和HGBL-0305模型肝转移率为100%和69.5%,脾转移率为94.3%和55.6%,淋巴结转移率为62.6%和45.7%,腹腔种植转移率为43.5%和30.5%;肝、脾、淋巴结和腹腔种植转移出现时间分别为移植后2周和5周,3周和6周,2周和3周,3周和6周.HGBL-0304和HGBL-0305模型肝转移分别以弥漫累及肝左右叶为主和肝右叶累及为主.HGBL-0304和HGBL-0305模型荷瘤鼠平均生存期分别为54.3 d和106.9 d.结论 外科原位移植体内筛选法是一种建立人恶性淋巴瘤裸鼠高转移模型和特异器官转移模型的有效方法.HGBL-0304和HGBL-0305模型是首次成功建立的来自同一瘤源的两株侵袭和转移潜能不同的人胃恶性淋巴瘤裸鼠原位移植肝转移模型和高转移模型.

Highly metastatic nude mouse model of human primary gastric lymphoma constructed by surgical orthotopic transplantation and in vivo continuous screening method

Objective To develop a series of high metastatic models of human gastric malignant lymphoma in nude mice by orthotopic transplantation. Methods Two histologically intact primary and hepatic metastatic fragments derived from surgical specimen of a patient with primary gastric lymphoma were implanted into the submucosa of stomach in nude mice. Highly metastatic and specific organ metastatic models were screened by selective orthotopic passage in nude mice. Transplantability, invasion, metastasis, morphological characteristics (light microscopy, electron microscopy and immunohistochemistry), karyotypic analysis and DNA content of orthotopically transplanted tumors were studied. Results Primary and hepatic metastatic fragments of primary gastric lymphoma were successfully transplanted in nude mice. Two nude mouse models of human primary gastric lymphoma, termed HGBL-0304 (hepatic metastasis model) and HGBL-0305 (high metastasis model), were developed, exhibiting different metastasis biology. Histopathology of transplanted tumors showed primary gastric diffuse large B cell lymphoma. Two models have been maintained for 45 generations by orthotopic passage in nude mice. A total of 419 nude mice were used for transplantation. The growth rate and resuscitation rate of liquid nitrogen cryopreservation of transplanted tumors were both 100%. Significant difference in metastasis biology was exhibited in four aspects of metastasis time, organ metastatic rate, the extent of hepatic metastasis and survival of cancer-bearing mice. The metastatic rates of liver, spleen, lymph nodes and peritoneal seeding in HGBL-O304 and HGBL-0305 models were 100% and 69.5%, 94.3% and 55.6%, 62.6% and 45.7%, and 43.5% and 30.5%. The onset time for metastases of liver, spleen, lymph nodes and peritoneal seeding was 2 w and 5 w, 3 w and 6 w, 2 w and 3 w, 3 w and 6 w respectively. The extent of hepatic metastasis in HGBL-0304 and HGBL-0305 models displayed diffuse involvement of the whole liver and mainly right lobe invasion of liver respectively. The mean survival time of HGBL-0304 and HGBL-O305 models was 54.3d and 106.9 d respectively. Conclusion Surgical orthotopic implantation combined with in vivo selective passage screening is an effective method for establishing highly metastatic and specific organ metastatic models of human malignant lymphoma in nude mice. The study is the first time to establish hepatic metastasis and high metastasis nude mouse models of human primary gastric lymphoma with the same original patient and different potentials of invasion and metastasis.