新城鸡瘟病毒诱导小鼠腹腔巨噬细胞产生肿瘤坏死因子的细胞毒活性研究

CYTOTOXIC ACTIVITY OF TNF α

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。

PURPOSE To determine whether murine peritoneal elicited macrophage (PEMΦ) infected by Newcastle Disease Virus Losota Strain (NDV 1) could produce TNF α. METHODS MTT cotorimetic assay and labelling by 3H TdR for cytotoxic effect on tumor cells was used. RESULTS NDV 1 could induce TNF α (v mTNF α) from murine PEMΦ,and the quantity of the v mTNF α were interrelated to the infecting dose of NDV 1 and PEMΦ.When the NDV 1's dose was regular,the released quantities of the v mTNF α were highest at 24 hours.A significant cytotoxic activity of the v mTNF α to tumor cells (Ca 761 86 and P 815) labeled by 3H TdR was also found. CONCLUSIONS The TNF α produced from murine peritoneal elicited macrophage by NDV 1 had marked cytotoxicity.