摘要目的:观察人白细胞抗原G(human leukocyte antigen G，HLA-G)在人T淋巴细胞白血病1型病毒(human T-cell leukemia virus type 1，HTLV-1)阳性T细胞中的表达情况，研究其在影响HTLV-1感染发生发展中的作用。方法:采用Western blot及real-time PCR检测HLA-G在HTLV-1阳性T细胞系(MT2和MT4)中的表达。构建HLA-G基因沉默的siRNA，用于敲低MT2和MT4细胞中的HLA-G，在mRNA和蛋白质水平观察HLA-G对HTLV-1蛋白Tax、P19表达的影响，同时在RNA水平监测HLA-G基因沉默后MT2和MT4细胞中细胞因子的表达变化。CCK8法观察MT2和MT4细胞的增殖能力，Western blot检测信号传导与转录激活因子3(signal transducer and activator of transcription 3，STAT3)通路相关蛋白。结果:与HTLV-1阴性T细胞(Jurkat和MOLT4)比较，MT2和MT4细胞均高表达HLA-G分子。siRNA敲低MT2和MT4细胞中的HLA-G后，HTLV-1 Tax和P19的mRNA和蛋白质表达水平均下降，抗病毒因子IFN-γ和TNF-α表达升高，MT2和MT4细胞的增殖能力和STAT3磷酸化水平均降低。结论:HTLV-1能诱导T细胞高表达免疫耐受分子HLA-G，抑制HLA-G表达可促进抗病毒因子的产生，降低IL-6及STAT3磷酸化水平，从而有效抑制HTLV-1的复制。

abstractsObjective:To analyze the expression of human leukocyte antigen G (HLA-G) in human T-cell leukemia virus type 1 (HTLV-1)-positive T cells, and to investigate its role in the occurrence and development of HTLV-1 infection.Methods:The expression of HLA-G in HTLV-1-positive T cell lines (MT2 and MT4) was detected by Western blot and real-time PCR. HLA-G gene in MT2 and MT4 cells was knocked down by siRNA, and the effects of HLA-G on the expression of HTLV-1 Tax and P19 at mRNA and protein levels were detected by Western blot and real-time PCR. Moreover, the changes in cytokine expression in MT2 and MT4 cells were monitored at RNA level after HLA-G gene silencing. The proliferation ability of MT2 and MT4 cells was analyzed by CCK8. Signal transducer and activator of transcription 3 (STAT3) pathway-related proteins were detected by Western blot.Results:Compared with HTLV-1-negative T cells (Jurkat and MOLT4), the expression of HLA-G increased significantly in MT2 and MT4 cells. After knocking down the HLA-G gene with siRNA in MT2 and MT4 cells, the expression of HTLV-1 Tax and P19 at mRNA and protein levels was decreased, and the expression of antiviral cytokines IFN-γ and TNF-α was increased. The proliferation of MT2 and MT4 cells and STAT3 phosphorylation in these cells were decreased.Conclusions:HTLV-1 could induce T cells to overexpress the immune tolerance molecule HLA-G. Silencing HLA-G gene in HTLV-1-positive T cells could promote the production of antiviral cytokines and reduce IL-6 expression and STAT3 phosphorylation, thereby effectively inhibiting the replication of HTLV-1.