淋巴细胞功能相关抗原-1/细胞间黏附分子-1介导的细胞因子诱导的杀伤细胞体外抑瘤机制

目的 探讨淋巴细胞功能相关抗原-1(LFA-1)/细胞间黏附分子-1(ICAM-1)介导的细胞因子诱导杀伤细胞(CIK)的体外抑瘤机制.方法 从白血病患儿外周血分离淋巴细胞,经过干扰素-γ(IFN-γ)、抗CD3单克隆抗体(CD3McAb)、白细胞介素-2(IL-2)诱导并与树突状细胞(DC)共培养,获得大量的DC-CIK.在经10、20μg/ml等不同质量浓度小鼠抗人LFA-1单克隆抗体处理后,采用MTT法研究DC-CIK细胞对多种白血病细胞株的杀伤活性,RT-PCR与Western blotting方法检测GATA-3和T-bet基因表达水平的变化.ELISA方法测定DC-CIK细胞释放细胞因子IL-12、IFN-γ、肿瘤坏死因子-α(TNF-α)的表达水平.结果 诱导后的DC-CIK细胞形态规则,经不同浓度的LFA-1单克隆抗体处理后,MTT结果:20μg/ml LFA-1单克隆抗体封闭组DC-CIK细胞对B95细胞杀伤作用下降最为明显(t=10.138,P＜0.05);RT-PCR与Western blotting结果:20μg/ml LFA-1单克隆抗体封闭的B95细胞组,GATA-3基因mRNA水平和蛋白水平表达增加最为明显(t=16.386,P＜0.05;t=22.652,P＜0.05);同时T-bet基因mRNA水平和蛋白水平表达降低最为明显(t=17.728,P＜0.05;t=17.452,P＜0.05);ELISA结果:20μg/ml LFA-1单克隆抗体封闭的B95细胞组中细胞因子IL-12、IFN-γ、TNF-α分泌水平下降最为明显(t=21.621,P＜0.05;t=13.739,P＜0.05;t=15.278,P＜0.05).结论 GATA-3和T-bet基因参与了LFA-1/ICAM-1介导的DC-CIK抑瘤途径,并且通过分泌Th1型细胞因子IL-12、IFN-γ、TNF-α等发挥抑瘤作用.

Mechanism of lymphocyte function-associated antigen-1/intercellular adhesion molecule-1 mediated anti-neoplastic effects of cytokine-induced killer cells

Objective To investigate the molecular mechanism underlying lymphocyte functionassociated antigen-1 (LFA-1) / intercellular adhesion molecule-1 (ICAM-1) mediated anti-neoplastic effects of cytokine induced killer (CIK) cells. Methods Lymphocytes isolated from peripheral blood of children leukemia were induced with interferon-gamma (IFN-y), anti-CD3 monoclonal antibody (CD3McAb) and interleukin-2 (IL-2) and co-cultured with dendrite cells (DC) to generate DC-CIK cells. When treated with LFA-1 monoclonal antibody, cytotoxicity of DC-CIK cells against leukemia cell lines was measured by the MTT assay, while RT-PCR and Western blotting were used to determine mRNA and protein expressions of GATA-3 and T-bet in DC-CIK cells, respectively. IL-12, IFN-γ and tumor necrosis factor-α (TNF-α) levels released by DC-CIK cells were quantified by ELISA. Results Induced DC-CIK cells were regular, round and transparent with variable cell volume and cellular aggregation. When treated with mouse anti-human LFA-1 monoclonal antibody, the cytotoxicity decreased mostly towards B95 cells under administration of 20 μg/ml LFA-1 monoclonal antibody in comparison with the control group(t =10.138, P ＜0.05). It led to a highest elevation of GATA-3 mRNA and protein levels (t =16.386, P ＜ 0.05; t =22.652, P ＜ 0.05) and a most decrease of T-bet mRNA and protein levels (t =17.728, P ＜0.05; t =17.452, P ＜0.05) under 20 μg/ml LFA-1 monoclonal antibody in B95 cells group in comparison with the control group. The expression levels of IL-12,IFN-γ, and TNF-o in supernatant were the lowest under 20 μg/ml LFA-1 monoclonal antibody in B95 cells group in comparison with the control group (t =21.621, P ＜0.05; t =13.739, P ＜0.05; t =15.278, P ＜0.05).Conclusion GATA-3 and T-bet were implicated in the LFA-1/ICAM-1 mediated anti-neoplastic effects of DC-CIK cells via activation of the Th1 pathway, with high secretion of Th1 cytokines, such as IL-12, IFN-γ and TNF-α.