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.
中科院分区:
文献类型:
--
作者:
Lee, Ni;Ishitani, Akiko;Geraghty, Daniel E.
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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