一株小鼠自发性乳腺癌细胞系MA—891的建立及其免疫生物学…

从津白Ⅱ号小鼠自发性乳腺癌ＴＡ２ＭＡ８９１建立了体外长期传代细胞系ＭＡ８９１。ＭＡ８９１细胞保持了ＴＡ２ＭＡ８９１的高转移特性，皮下接种后肿瘤进行生长，并无一例外地发生肿瘤肺转移。ＭＡ８９１细胞的免疫原性极弱，表现为：（１）淋巴细胞－肿瘤细胞混合培养（ＭＬＴＣ）只能诱导出低水平的细胞毒Ｔ细胞（ＣＴＬ）；（２）肿瘤浸润淋巴细胞（ＴＩＬ）含量少，体外经ＩＬ－２扩增后只表现出微弱的细胞毒活性；（３）在上

MA891--an established spontaneous mouse mammary adenocarcinoma cell line and its immunologic characteristics]

OBJECTIVE: To characterize the immunologic properties of an established mouse mammary tumor cell line MA891. METHODS: From a spontaneous mouse mammary adenocarcionma (TA2 MA891) of TA2 mouse origin, an in vitro passaged cell line MA891 was maintained in RPMI1640 with 10% new born calf serum. The immunogenecity of MA891 was studied by classical tumor transplantation rejection assay, generation of cytotoxic T lymphocytes (CTL) by syngeneic secondary mixed lymphocyte-tumor cell culture (MLTC) and cytotoxic assay of tumor infiltrating lymphocytes (TIL). RESULTS: MA891 maintained the high metastatic potential of the parental TA2 MA891 tumor passaged in vivo. Transplantation rejection studies indicated that amputation of a hind limb with growing tumor in the footpad did not protect the mice from a second subcutaneous challenge of the same tumor. The cytotoxic activities of both CTL and TIL were shown to be very weak. CONCLUSION: MA891 is a mouse tumor of very low immunogenecity. It can be used as a mouse tumor model for studying cancer metastasis in humans.