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The cytotoxicity of spleen lymphocytes against YAC-1 cells, against syngeneic B-16 and F-10 melanoma cells was augmented not only by incubation of spleen lymphocytes with human recombinant interleukin-2 (rIL-2) in vitro, but also by injecting C57BL/6 mice with high dose rIL-2 for more than 3 consecutive days. In animals injected s.c. with multiple high dose rIL-2, the numbers of tumor nodules in the lung were significantly decreased 21 days after i.v. tumor inoculation. In addition, in these groups of animals no liver metastases were observed although liver metastases were detected in 6/11 control mice.
脾淋巴细胞对YAC-1细胞、同基因B-16和F-10黑色素瘤细胞的细胞毒性不仅通过在体外将脾淋巴细胞与人重组白细胞介素-2(rIL-2)孵育而增强,还通过连续3天以上给C57BL/6小鼠注射高剂量rIL-2来增强。在皮下注射多次高剂量rIL-2的动物中,静脉注射肿瘤接种21天后肺内肿瘤结节数量显著减少。此外,在这些动物组中未观察到肝转移,而在11只对照小鼠中有6只检测到肝转移。
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