Human leukocyte antigen-G (HLA-G) has long been speculated as a beneficial factor for a successful pregnancy for its restricted expression on fetal-maternal extravillous cytotrophoblasts and its capability of modulati...Human leukocyte antigen-G (HLA-G) has long been speculated as a beneficial factor for a successful pregnancy for its restricted expression on fetal-maternal extravillous cytotrophoblasts and its capability of modulating uterine natural killer cell (uNK) function such as cytotoxicity and cytokine production through NK cell receptors. HLA class I α1 domain is an important killer cell Ig-like receptor (KIR) recognition site and the Met76 and Gln79 are unique to HLA-G in this region. NK cell receptor KIR2DL4 is a specific receptor for HLA-G, yet the recognition site on HLA-G remains unknown. In this study, retroviral transduction was applied to express the wild type HLA-G (HLA-wtG), mutant HLA-G (HLA-mG) on the chronic myelogenous leukemia cell line K562 cells and KIR2DL4 molecule on NK-92 cells, respectively. KIR2DL4-IgG Fc fusion protein was generated to determine the binding specificity between KIR2DL4 and HLA-G. Our results showed that residue Met76, Gln79 mutated to Ala76,79 in the α1 domain of HLA-G protein could affect the binding affinity between KIR2DL4 and HLA-G, meanwhile, the KIR2DL4 transfected NK-92 cells (NK-92- 2DL4) showed a considerably different cytolysis ability against the HLA-wtG and HLA-mG transfected K562 targets. Taken together, our data indicated that residue Met76 and Gln79 in HLA-G α1 domain plays a critical role in the recogni- tion of KIR2DL4, which could be an explanation for the isoforms of HLA-G, all containing the α1 domain, with the potential to regulate NK functions.展开更多
目的研究KIR2DL3/HLA-C1基因组合与丙型肝炎病毒(Hepatitis C virus,HCV)清除的相关性。方法本研究对随机抽取的无血缘关系的40个健康成人(中国汉族)外周血样本进行了KIR及HLA-Cw基因分型,并分析了与HCV清除相关的KIR2DL3/HLA-C1基因组...目的研究KIR2DL3/HLA-C1基因组合与丙型肝炎病毒(Hepatitis C virus,HCV)清除的相关性。方法本研究对随机抽取的无血缘关系的40个健康成人(中国汉族)外周血样本进行了KIR及HLA-Cw基因分型,并分析了与HCV清除相关的KIR2DL3/HLA-C1基因组合的分布情况。结果 40例样本中HLA-Cw位点HLA-C1基因出现频率较HLA-C2高,且HLA-C1C1出现的频率较HLA-C1C2高;KIR基因型中,以3DL1、2DL1、2DL3、2DL4、3DL2、3DL3、2DP1、3DP1、2DS4出现频率较高,而3DS1、2DS1、2DS2、2DS3、2DS5、2DL2、2DL5出现频率较低;KIR2DL3+/HLA-C1C1例数较KIR2DL2+/HLA-C1C1多。综合分析发现,KIR2DL3+/HLA-C1基因型组合以KIR2DL3-2DL3/HLA-C1C1者较多,占总样本数52.5%。结论以本研究为基础,可进一步研究KIR2DL3/HLA-C1基因型组合与NK细胞体外抑制HCV活性的相关性,探讨HLA-Cw基因型为C1C1的个体中,KIR 2DL3-2DL3个体的NK细胞是否较2DL2-2DL2个体以及2DL3-2DL2个体的NK细胞具有更强的抑制HCV活性的作用,为丙型肝炎的免疫治疗及疫苗研制提供依据。展开更多
文摘Human leukocyte antigen-G (HLA-G) has long been speculated as a beneficial factor for a successful pregnancy for its restricted expression on fetal-maternal extravillous cytotrophoblasts and its capability of modulating uterine natural killer cell (uNK) function such as cytotoxicity and cytokine production through NK cell receptors. HLA class I α1 domain is an important killer cell Ig-like receptor (KIR) recognition site and the Met76 and Gln79 are unique to HLA-G in this region. NK cell receptor KIR2DL4 is a specific receptor for HLA-G, yet the recognition site on HLA-G remains unknown. In this study, retroviral transduction was applied to express the wild type HLA-G (HLA-wtG), mutant HLA-G (HLA-mG) on the chronic myelogenous leukemia cell line K562 cells and KIR2DL4 molecule on NK-92 cells, respectively. KIR2DL4-IgG Fc fusion protein was generated to determine the binding specificity between KIR2DL4 and HLA-G. Our results showed that residue Met76, Gln79 mutated to Ala76,79 in the α1 domain of HLA-G protein could affect the binding affinity between KIR2DL4 and HLA-G, meanwhile, the KIR2DL4 transfected NK-92 cells (NK-92- 2DL4) showed a considerably different cytolysis ability against the HLA-wtG and HLA-mG transfected K562 targets. Taken together, our data indicated that residue Met76 and Gln79 in HLA-G α1 domain plays a critical role in the recogni- tion of KIR2DL4, which could be an explanation for the isoforms of HLA-G, all containing the α1 domain, with the potential to regulate NK functions.
文摘目的研究KIR2DL3/HLA-C1基因组合与丙型肝炎病毒(Hepatitis C virus,HCV)清除的相关性。方法本研究对随机抽取的无血缘关系的40个健康成人(中国汉族)外周血样本进行了KIR及HLA-Cw基因分型,并分析了与HCV清除相关的KIR2DL3/HLA-C1基因组合的分布情况。结果 40例样本中HLA-Cw位点HLA-C1基因出现频率较HLA-C2高,且HLA-C1C1出现的频率较HLA-C1C2高;KIR基因型中,以3DL1、2DL1、2DL3、2DL4、3DL2、3DL3、2DP1、3DP1、2DS4出现频率较高,而3DS1、2DS1、2DS2、2DS3、2DS5、2DL2、2DL5出现频率较低;KIR2DL3+/HLA-C1C1例数较KIR2DL2+/HLA-C1C1多。综合分析发现,KIR2DL3+/HLA-C1基因型组合以KIR2DL3-2DL3/HLA-C1C1者较多,占总样本数52.5%。结论以本研究为基础,可进一步研究KIR2DL3/HLA-C1基因型组合与NK细胞体外抑制HCV活性的相关性,探讨HLA-Cw基因型为C1C1的个体中,KIR 2DL3-2DL3个体的NK细胞是否较2DL2-2DL2个体以及2DL3-2DL2个体的NK细胞具有更强的抑制HCV活性的作用,为丙型肝炎的免疫治疗及疫苗研制提供依据。
