HLA-F is a surface marker on activated lymphocytes.

HLA-F is a surface marker on activated lymphocytes.
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DOI:
10.1002/eji.201040348
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发表时间:
2010-08
影响因子:
5.4
通讯作者:
Geraghty, Daniel E.
Geraghty, Daniel E.
中科院分区:
医学3区
文献类型:
--
作者:
Lee, Ni;Ishitani, Akiko;Geraghty, Daniel E.

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在人类表达的三种非经典 I 类抗原中,HLA-F 在表达或功能方面的特征最少。在这项研究中,我们重点检查了淋巴细胞的 HLA-F 表达,之前对同源细胞系的研究已证明其表面 HLA-F 表达。通过蛋白质印迹分析,在所有静息淋巴细胞中观察到 HLA-F 蛋白表达,包括 B 细胞、T 细胞、NK 细胞和单核细胞,所有这些细胞在静息状态下均缺乏表面表达。激活后,使用多种方法激活不同的淋巴细胞亚群,所有细胞内表达 HLA-F 的细胞类型均显示出表面 HLA-F 蛋白的诱导。对 TAP 和 Tapasin 表达遗传缺陷个体的外周血进行检查,结果表明 HLA-F 具有相同的激活表达谱,但激活后动力学发生了改变。对 CD4+、CD25+ 调节性 T 细胞的进一步分析表明,当这些细胞被激活时,大部分细胞的 HLA-F 并未上调,而 CD4+、CD25- T 细胞在相同条件下激活时,显示出表面 HLA-F 的强烈表达。这些发现讨论了 HLA-F 的可能功能以及 HLA-F 作为激活免疫反应标志物的潜在临床用途。
Of the three nonclassical class I antigens expressed in humans, HLA-F has been least characterized with regard to expression or function. In this study we examined HLA-F expression focusing on lymphoid cells where previous work with homologous cell lines had demonstrated surface HLA-F expression. HLA-F protein expression was observed by western analysis in all resting lymphocytes, including B cells, T cells, NK cells, and monocytes all of which lacked surface expression in the resting state. Upon activation, using a variety of methods to activate different lymphocyte subpopulations, all cell types that expressed HLA-F intracellularly showed an induction of surface HLA-F protein. An examination of peripheral blood from individuals genetically deficient for TAP and Tapasin expression demonstrated the same activation expression profiles for HLA-F but with altered kinetics post activation. Further analysis of CD4+, CD25+ regulatory T cells showed HLA-F was not upregulated on the major fraction of these cells when they were activated, whereas CD4+, CD25- T cells showed strong expression of surface HLA-F when activated under identical conditions. These findings are discussed with regard to possible functions for HLA-F and towards the potential clinical use of HLA-F as a marker of an activated immune response.
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