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目的观察新城鸡瘟病毒Ｌ系（ＮＤＶ－Ｌ）诱导小鼠腹腔巨噬细胞（ＰＥＭΦ）产生的肿瘤坏死因子－α（ＴＮＦ－α）对肿瘤细胞的细胞毒性作用。方法采用噻唑蓝（ＭＴＴ）和３Ｈ－脱氧胸苷（３Ｈ－ＴｄＲ）标记肿瘤细胞的方法。结果ＮＤＶ－Ｌ可诱导小鼠ＰＥＭΦ产生ＴＮＦ－α，其产生的量随ＮＤＶ－Ｌ感染量的增加而活性增强。当ＮＤＶ－Ｌ感染剂量一定时，ＴＮＦ－α释放量在ＮＤＶ－Ｌ作用ＰＥＭΦ２４ｈ时为最强（１００Ｕ／ｍｌ）。用３Ｈ－ＴｄＲ标记肿瘤细胞（小鼠乳腺癌细胞系Ｃａ７６１－８６和小鼠肥大细胞瘤Ｐ８１５）做ＴＮＦ－α的细胞毒试验，表明其具有明显的杀伤活性。结论ＮＤＶ－Ｌ诱导小鼠腹腔巨噬细胞产生的ＴＮＦ－α具有明显的细胞毒活性。
Objective To observe the cytotoxicity of tumor necrosis factor-α (TNF-α) induced by NDV-L in mice peritoneal macrophages (PEMΦ). Methods The tumor cells were labeled with MTT and 3H-TdR. Results NDV-L induced the production of TNF-α in mouse PEMΦ, and its production increased with the increase of NDV-L infection. When the dose of NDV-L was fixed, the release of TNF-α was the strongest (100U / ml) at NDV-L at PEMΦ24h. The cytotoxicity of TNF-α by 3H-TdR-labeled tumor cells (mouse breast cancer cell line Ca761-86 and mouse mastocytoma P815) showed that it has obvious killing activity. Conclusion NDV-L induced TNF-α produced by peritoneal macrophages in mice has obvious cytotoxic activity.