中文摘要：

目的研究多肽类抗原-超抗原金黄色葡萄球菌肠毒素B(staphylococcal enterotoxin B,SEB)活化的NKT细胞亚群及耐受特征。方法小鼠脾细胞分别与SEB和ConA体外培养,MTT方法测定细胞增殖;特异性耐受特征的研究使用体外活化第3天的细胞,吸出上清后添加二次抗原ConA、LPS、IL-2,继续培养3 d,MTT方法测定细胞对二次抗原的应答反应能力。用流式细胞测定法解析SEB和ConA体外活化的淋巴细胞在第0、5、10和15天时的T和NKT淋巴细胞亚群。结果SEB和ConA均诱导了小鼠淋巴细胞在体外增殖;SEB活化的淋巴细胞对ConA、LPS和IL-2的二次应答反应能力消失,细胞增殖的OD570nm值由一次应答反应的0.433±0.07分别下降到0.19±0.01、0.14±0.02和0.15±0.04(P<0.01)。ConA活化的淋巴细胞的二次应答反应依然存在并依赖IL-2。SEB活化的淋巴细胞是CD4+NK1.1+和CD8+NK1.1+NKT细胞,而不是CD4-CD8-NKT细胞。ConA活化的淋巴细胞是CD3+、CD4+和CD8+T淋巴细胞并包括了CD4-CD8-/CD3+NK1...

英文摘要：

Objective To investigate the tolerance characteristics of natural killer T(NKT) subsets activated with superantigen staphylococcal enterotoxin B(SEB).Methods Immune tolerance characteristics of SEB-activated lymphocytes in vitro were examined by measuring the recall response ability to ConA,LPS,or IL-2 with MTT.The NKT subsets induced by SEB stimulation were identified by flow cytometric analysis.Results SEB and ConA induced massive proliferation of peripheral lymphocytes.The recall responses of SEB-activat...