HCMV感染对单核细胞HLA－DR表达的影响

本文采用细胞ＥＬＩＳＡ法，研究发现人巨细胞病毒（ＨＣＭＶ）感染对单核细胞ＨＬＡ－ＤＲ的影响。结果表明ＨＣＭＶ感染后１ｄ，单核细胞ＨＬＡ－ＤＲ表达显著增高（Ｐ＜０．０１），以后逐渐降低，ｄ５降至对照水平；ＩＦＮγ（５００Ｕ／ｍｌ）．ＴＮＦ（２５０Ｕ／ｍｌ）、ＩＬ－６（５００／ｍｌ）、ＩＬ－１（５００／ｍｌ）均能不同程度地刺激单核细胞ＨＬＡ－ＤＲ表达；ＨＣＭＶ感染后，细胞因子刺激ＨＬＡ－ＤＲ表达的水平在感染后ｄ５，较对照组均显著降低（Ｐ＜０．０１）；ＩＬ－１＋ＩＦＮ－γ及ＴＮＦ＋ＩＦＮ－γ在刺激单核细胞ＨＬＡ－ＤＲ表达时有协同作用；ＨＣＭＶ感染后，ＩＦＮ－γ＋ＩＬ－１及ＴＮＦ＋ＩＦＮ协同刺激单核细胞ＨＬＡ－ＤＲ表达水平较对照组显著降低（Ｐ＜０．０１）。结果提示：在ＨＣＭＶ感染引起免疫抑制过程中，其引起单核细胞ＨＬＡ－ＤＲ表达降低是一重要机制。

Effects of HCMV Infection on HLA-DR Expression of Monocytes

Using cell-ELISA, we investigated the effocts of HCMV infection on HLA-DR expression of monocytes. The results showed that HLA-DR on monocytes significantly inereased on 1st day after infection, and thou gradually decreased below the control. IFN-γ(500U/ml),TNF(250U/ml), IL-6(500U/ml)and IL-1(500U/ml) alone can enhance the HLA-DR expression on monocytes. On 1st day PI HLA-DR expression on monocytes induced by IFN-γ, IL-1, TNF or IL-6 was lower than uninfected control significantly (P<0.01) and was as low as unstimulated control on sib day of infection. IFN-γ plus TNF(P<0.01) and IL-1 plus IFN-γ may synergically stimulate HLADR expression was lower than uninfectcd control (P<0.01). These results indicated that decreased HLA-DR expression on monocytes after HCMV infection is an important mechanism of immunosuppression caused by HCMV infection.