中国寄生虫学与寄生虫病杂志 ›› 1998, Vol. 16 ›› Issue (6): 436-440.

• 论著 • 上一篇    下一篇

IFN-γ活化小鼠腹腔巨噬细胞抗弓形虫作用的剂量相关性及其与TNF-α的协同作用

张爱民; 杨惠珍; 杨杨; 钱宗立   

  1. 上海市免疫研究所寄生虫学研究室
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1998-12-31 发布日期:1998-12-31

CORRELATION BETWEEN THE DOSE AND THE ANTI TOXOPLASMA EFFECT OF ACTIVATED MOUSE MACROPHAGES INDUCED BY IFN-γ AND THE SYNERGISM BETWEEN IFN-γ AND TNF-α

Zhang Aimin; Yang Huizhen; Yang Yang; Qian Zhongli   

  1. Laboratory of Parasitology; Shanghai Institute of Immunology; Shanghai 200025
  • Received:1900-01-01 Revised:1900-01-01 Online:1998-12-31 Published:1998-12-31

摘要: 目的:揭示IFN-γ抗弓形虫作用的剂量相关性及TNF-α对IFN-γ是否存在协同作用。方法:本实验体外以不同剂量IFN-γ单独或与TNF-α联合刺激昆明鼠腹腔巨噬细胞,观察其对入侵的RH株速殖子的作用及培养上清中NO的水平。结果:随着IFN-γ剂量的增大,巨噬细胞抗虫作用增强,培养上清中NO水平增高;虫体入侵后24hNO水平与细胞内虫体数呈显著负相关。结论:IFN-γ可激活巨噬细胞抑制和杀灭入侵的弓形虫,并与剂量有关,TNF-α对此有协同作用,NO是抗虫作用中重要的效应因子。

关键词: 弓形虫, γ-干扰素, 肿瘤坏死因子-α, 巨噬细胞, 氧化氮

Abstract: AIM: To find out the dose dependence of the anti-Toxoplasma effect induced by IFN-
γ and to determine the possible synergistic activity between TNF-α and IFN-γ. METHODS: The in
vitro
effect of cultivated mouse peritoneal macrophages activated by IFN-γ alone or IFN-γ
combined with different doses of TNF-α on the intracellular tachyzoites of RH strains and the
nitric oxide (NO) level in the culture medium supernatant were simultaneously determined.
RESULTS: With the increase in the dose of IFN-γ, the anti-Toxoplasma effect was augmented and the NO level was enhanced. At 24 hours after tachyzoite invasion, a significant reversed correlation was demonstrated between the NO level and the number of intracellular parasites. CONCLUSION: The anti-Toxoplasma effect of macrophages activated by IFN-γ appears to be dose-dependent and TNF-αacts synergitically with IFN-γ in the activation of macrophages. The production of reactive NO could be an important effector in the IFN-γ primed anti-Toxoplasma action.

Key words: Toxoplasma gondii, interferon γ, tumor necrosis factor α, marcrophage, nitric oxide