DV2 NGC株感染BALB/C小鼠后IL-4、IFN-γ产生动态的研究

The dynamic observation of the levels of IL-4 and IFN-γ in the BALB/C mice infected with DV2 NGC strain

目的 :观察 2型登革病毒NGC株感染BALB C小鼠后其IL 4、IFN γ产生动态 ,研究登革病毒感染的免疫机制。方法 :用不同含量的DV2NGC株经皮下多点注射 ,间接ELISA法测定感染后不同时间各组小鼠血浆IL 4、IFN γ含量。结果 :DV2NGC株感染小鼠产生IL 4和IFN γ动态不同。初次感染早期 ,IL 4水平明显升高 ,而IFN γ处于较低水平 ;再次感染后第 1天 ,IL 4水平达最高峰 ( 4 2 94 6 6 8± 349 0 38pg ml) ,IFN γ则于第 4天和第 11天达较高水平 ,两者的产生彼消此长 ,且产生动态与感染病毒量有关。结论 :DV2NGC株感染早期 ,体液免疫和细胞免疫相互影响 ,体液免疫占主导作用 ,为Th2应答优势。但在登革热感染后期 ,细胞免疫一定程度抑制Th2应答 。

Objective:BALB/C mice model infected with DV2 NGC strain was evaluated and dynamic patterns of cytokines were investigated.Methods:The dynamic changes of cytokines were observed in the infected BALB/C mice model by indirect ELISA was observed.Results:The dynamic levels of IL-4、IFN-γ in the plasma of BALB/C mice after primary and secondary infected DV2 NGC strain were different.The results showed that the levels of IL-4 were significantly increasing in the early primary infected BALB/C mice while that of IFN-γ were lower;In secondary infection ,IL-4 reached a peak on the first day( 4294 668 ± 349 038 pg/ml) and then the levels of IFN-γ were higher on the forth and eleventh day.The concentrations of the cytokines produced infectious animals had closely relationship with the doses of DV2.Conclusion:Infection eliciting a dominant humonral immune response induced a high expression of Th2-related cytokines,whereas those show some appearance of Th1 cytokines.Th1 response,as described late for the disease infected with DV2 NGC strain,played a role while it inhibited Th2 response to some extend.Thus,it was responsible to recovery.Th cell and the cytokines were critic to the DV infective diseases.