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胎盘滋养层是直接与母体接触的与母体基因型不同的胎儿组织,滋养层细胞是否表达主要组织相容性复
合体(MHC)抗原以及表达何种MHC抗原对于妊娠成功与否至关重要.非经典MHCⅠ类抗原发现较晚,其中
HLA-G在滋养层细胞表达,可以保护带有父方同种异体抗原的胎儿免受母体免疫系统的杀伤.经典MHCⅠ类抗
原有多种亚型,不同亚型在滋养层细胞的表达有所不同.MHC
Ⅱ类抗原在妊娠维持过程中表达极弱,新近的研
究资料表明,滋养层细胞CⅡTA在MHCⅡ类基因表达调控中起主要作用. 相似文献
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The induction of the major histocompatibility (MHC), antigen-presenting class II molecules by interferon-gamma, in solid tumor cells, requires the retinoblastoma tumor suppressor protein (Rb). In the absence of Rb, a repressosome blocks the access of positive-acting, promoter binding proteins to the MHC class II promoter. However, a complete molecular linkage between Rb expression and the disassembly of the MHC class II repressosome has been lacking. By treating A549 lung carcinoma cells with a novel small molecule that prevents phosphorylation-mediated, Rb inactivation, we demonstrate that Rb represses the synthesis of an MHC class II repressosome component, YY1. The reduction in YY1 synthesis correlates with the advent of MHC class II inducibility; with loss of YY1 binding to the promoter of the HLA–DRA gene, the canonical human MHC class II gene; and with increased Rb binding to the YY1 promoter. These results support the concept that the Rb gene regulatory network (GRN) subcircuit that regulates cell proliferation is linked to a GRN subcircuit regulating a tumor cell immune function. 相似文献
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Transcription repression of human hepatitis B virus genes by negative regulatory element-binding protein/SON 总被引:2,自引:0,他引:2
Sun CT Lo WY Wang IH Lo YH Shiou SR Lai CK Ting LP 《The Journal of biological chemistry》2001,276(26):24059-24067
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