Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Comparison of the expression of cytokine genes in the bursal tissues of the chickens following challenge with infectious bursal disease viruses of varying virulence | Liu et al. Virology Journal 2010 7 364 http content 7 1 364 VIROLOGY JOURNAL RESEARCH Open Access Comparison of the expression of cytokine genes in the bursal tissues of the chickens following challenge with infectious bursal disease viruses of varying virulence Haiwen Liu Manfu Zhang Haitang Han Jihong Yuan Zandong Li Abstract Background Cytokines are important mediators and regulators of host responses against foreign antigen with their main function to orchestrate the functional activities of the cells of the immune system. However little is known about the role of cytokines in pathogenesis and immune responses caused by infectious bursa disease virus IBDV . The aim of this study was to examine the transcripts of cell-mediated immune response-related cytokine genes in the bursal tissues of chickens infected with IBDVs of varying virulence to gain an understanding of pathological changes and mechanisms of immunosuppression caused by IBDV infection and the immune responses evoked. Results Real-time quantitative PCR analysis revealed that the expression levels of both Th1 interferon IFN -y interleukins IL -2 and IL-12p40 and Th2 IL-4 IL-5 IL-13 and IL-10 cytokines were significantly up-regulated following challenge with the H strain vvIBDV and up to 2- and 30-fold respectively P . Following infection with the Ts strain cell-adapted virus these cytokine transcripts were up-regulated at 5 days post-infection dpi 2-and 13-fold respectively P while the expression levels of IL-2 and IL-4 were not significantly different P . A higher degree of cytokine expression was induced by the H strain compared with the Ts strain. Conclusion The results indicate that the expression of cell-mediated immune-related cytokine genes is strongly induced by IBDV especially by the vvIBDV H strain and reveal that these cytokines could play a crucial role in driving cellular immune responses during the acute phase of IBDV infection and the cellular immune .
