中国寄生虫学与寄生虫病杂志 ›› 2006, Vol. 24 ›› Issue (2): 10-124.

• 实验报道 • 上一篇    下一篇

弓形虫感染大鼠外周血T淋巴细胞亚群及IFN-γ、TNF-α、IL-4动态变化

王春莉1;周永华2;刘健虎1   

  1. 1 中国人民解放军第101医院传染科, 无锡 214044; 2 江苏省寄生虫病防治研究所, 无锡 214064
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-04-30 发布日期:2006-04-30

Changes of Peripheral Blood T Lymphocytes, IFN-γ, TNF-α andIL-4 in Rats Infected by Toxoplasma gondii

WANG Chun-li1;ZHOU Yong-hua2;LIU Jian-hu1   

  1. 1 Department of Infection, PLA 101 Hospital, Wuxi 214044, China; 2 Jiangsu Provincial Institute of Parasitic Diseases, Wuxi 214064, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-04-30 Published:2006-04-30

摘要: 目的 观察弓形虫感染大鼠外周血T淋巴细胞亚群及干扰素-γ(IFN-γ)、肿瘤坏死因子-α(TNF-α)、白细胞介素-4(IL-4)动态变化。 方法 将54只清洁级Sprague-Dawley(SD)成年大鼠随机分成9组,其中8组每鼠腹腔注射经纤维素-11(CF-11)纯化的活弓形虫速殖子悬液2 ml(2×105/L)。分别于弓形虫感染后1、3、7、14、28、35、42、60 d时取大鼠外周全血,流式细胞术检测T细胞亚群变化,ELISA检测外周血IFN-γ、TNF-α、IL-4动态变化。对照组腹腔注射2 ml生理盐水。 结果 T淋巴细胞亚群CD8+水平在感染弓形虫后3 d(14.22%)、7 d(14.93%)、14 d(16.08%)均显著低于正常水平(23.08%)(P<0.05),至感染后28 d恢复正常水平,而CD4+水平在整个感染过程中无明显变化。IFN-γ和IL-4水平在感染后第7 d分别升高至6.73 pg/ml和6.91 pg/ml(P<0.05),至感染60 d仍高于正常水平;TNF-α至感染后28 d(14.37 pg/ml)及60 d均高于正常水平(10.81 pg/ml)(P<0.05)。 结论 弓形虫感染后大鼠外周血CD8+水平一度降低,28 d后恢复正常,CD4+无明显变化,IFN-γ、IL-4和TNF-α均高于正常水平,但出现时间有差异。

关键词: 弓形虫感染, 酶联免疫吸附法, 流式细胞术, CD4+, CD8+T淋巴细胞, 干扰素-γ, 肿瘤坏死因子-α, 白细胞介素-4

Abstract: Objective To observe the changes of peripheral blood T lymphocytes, IFN-γ, TNF-α and IL-4 in rats infected by T. gondii. Methods 48 Sprague-Dawley(SD) rats were intra-abdominally injected with 2×105/L of cellulose purified living tachyzoites in 2 ml and randomly divided into 8 groups. Six rat was intra-abdominally injected 2 ml of saline as control and 4 rats were remained as normal control. Peripheral blood was collected and the level of IFN-γ, TNF?-α, IL-4 was analyzed by ELISA on day 1, 3, 7, 14, 28, 35, 42, 60. Results Level of IFN-γ (6.73 pg/ml) and IL-4 (6.91 pg/ml) increased in experimental rats on day 7 (P<0.05) and maintained. Level of TNF-α (14.37 pg/ml) increased in experimental rats on day 28 (P<0.05), and that of CD8+ T lymphocytes (14.22%) was significantly lower than that in control (23.08%) (P<0.05) and recovered on day 28. No considerable change was observed on the level of CD4+ T lymphocytes. Conclusion The level of CD8+ T lymphocytes, IFN-γ, TNF-α and IL-4 in the rat can be affected by the infection of T. gondii and the level of CD4+ T lymphocytes shows no change.

Key words: Toxoplasma gondii, ELISA, Flow cytometry, CD4+, CD8+ T lymphocyte, IFN-γ, TNF-α, IL-4