RESUMEN
Objective To establish a mice model of diffuse large B-cell lymphoma (DLBCL) that was treated with adoptive immunity of Th17 cells cultured in vitro,and to analyze the relationship between IL-17 and MHC Ⅱ expression and their relation with tumor growth.Methods The CD4+CD62L+ T cells purified by MACS were stimulated under cytokine conditions including anti-CD3,anti-CD28,TGF-β and IL-6 in vitro,and SUDHL-4 cells were cultured and inoculated the SCID mice to establish DLBCL mice models.The mice were divided into Th17 cells immunity group (30 mice) and control group (20 mice).Th17 cells were injected to mice to get the adoptive immunity in immunity group,and 0.9 ％ NaCl in control group.The half mice were terminated at median disease onset time and median survival time,respectively.ELISA was used to detect IL-17 expression,and immunohistochemistry was applied to detect MHC Ⅱ expression in the tumor tissues.Results The median disease onset time of DLBCL mice model was 8 d,and median survival time was 28 d.The IL-17 and MHC Ⅱ expression levels in Th17 cells immunity group [(11.93±0.56) pg/ml,(69.13t0.36) ％] were higher than those in control group [(9.82±0.26) pg/ml,(42.59±0.12) ％] (both P＜ 0.000 1).Along with the progress of DLBCL,IL-17 and MHC Ⅱ expression levels were decreased [(9.53±0.18) pg/ml,(54.63±0.45) ％,both P ＜ 0.000 1].There was a significantly positive correlation between IL-17 and MHC Ⅱ (r=0.89,P=0.000).Conclusions The expression level of MHC Ⅱ can be used as a factor to judge the disease situation of DLBCL,and combination detection of the expression of both IL-17 and MHC Ⅱ will provide more reference values for judgment of the disease situation and the progress of DLBCL.