日本血吸虫可溶性成虫抗原和虫卵抗原对CD4~+ T淋巴细胞凋亡和细胞周期的影响

目的观察并比较日本血吸虫可溶性成虫抗原(SWA)、可溶性虫卵抗原(SEA)对小鼠CD4+T淋巴细胞凋亡和细胞周期的影响。方法以免疫磁珠分选正常小鼠脾细胞中的CD4+T淋巴细胞后,与羧基荧光素二醋酸盐琥珀酰亚胺酯标记的抗原递呈细胞共培养,并分别以PBS、SWA、SEA刺激。36h后以流式细胞术(FCM)结合caspase-3荧光抗体标记技术检测CD4+T淋巴细胞的凋亡水平;96h后以碘化丙锭染色结合FCM分析CD4+T淋巴细胞周期分布情况。结果凋亡分析结果显示,经SEA和SWA刺激后,外周CD4+T细胞的凋亡百分比分别为(1.24±0.29)%和(1.52±0.38)%,两者差异无统计学意义(P0.05)。细胞周期分析表明,SWA组处于G1期、S期和G2/M期的细胞百分比分别为(78.91±2.98)%、(7.39±0.85%)和(10.69±1.05)%;与之相比,SEA组G1期细胞百分比[(59.42±1.32)%]显著降低,S期[(21.07±0.88)%]和G2/M期[(18.88±1.21)%]显著增加,差异均有统计学意义(P均0.01)。结论SWA、SEA均可诱导CD4+T淋巴细胞凋亡,SEA促进CD4+T淋巴细胞进入分裂周期的作用更明显。

Effect of soluble worm antigen and soluble egg antigen of Schistosoma japonicum on apoptosis and cell-cycle of CD4+ T lymphocytes

Objective To investigate and compare the different effects of soluble adult wornl antigen(SWA)and soluble egg antigen(SEA)of Schistosoma japonicum on the apoptosis and cell-cycle of routine CD4~+T cells.Methods Purified CD4~+T ceUs from normal C57BL/6 mice were cultured with CFSE labeled antigen presenting clls in the presence of different stimuli for 36 h.Flow cytometry(FCM)was used to detect the apoptosis of CD4~+T cells by fluorescence conjugated caspase-3 antibodie staining.The flow cytometry was used to analyze the cell-cycle of CD4~+T cells cultured as described above for 96 h by propidium iodide staining.Results Compared with the apoptosis percentage of CD4~+T cells[(1.24±0.29)%]in the SEA stimulated group,that in the SWA stimulated group[(1.52±0.38)%]did not show statistically significant difference(P>0.05).Compared with the cell percentages in G1 phase[(78.91±2.98)%],S phase[(7.39±0.85)%]and G2/M phase[(10.69±1.05)%] in the SWA stimulated group,that of the G1 phase[(59.42±1.32)%]was significantly lower,but those in the S phase[(21.07±O.88)%] and G2/M phase[(18.88±1.21)%]were significantly increased in the SEA stimulated group(P<0.01).Conclusions There is no statistically significant difference between the apoptosis levels of CD4~+T ceHs stimulated by SWA and SEA.However,SEA significantly promotes the progression of the cell-cycle of CD4~+T cells compared with SWA.