Abstract:
:Over the last few years, natural killer (NK) cells have been shown to express major histocompatibility complex (MHC) molecules recognizing receptors that are thought to function primarily as negative signalling receptors. Much attention has been focused on the NK cell receptors CD158a (EB6) and CD158b (GI 183), which recognize two alternative epitopes on the HLA-Cw locus. In order to investigate whether HLA type affects the CD158a/b repertoire, expressed as percentage positive cells for a particular receptor and mean expression on this population of NK cells, peripheral blood lymphocytes of 47 HLA-typed donors were examined. Peripheral blood samples were examined by flow cytometric analysis to investigate the expression of CD158a and CD158b receptors on the surface of NK cells. In parallel, we determined each individual's HLA phenotype. There was a great heterogeneity in CD158 expression; nevertheless all individuals had NK cells belonging either to the CD158 a+b-, a-b+ or a-b- populations. No positive or inverse correlations could be shown between either receptor expression intensity or proportion of positive cells, and presence of the appropriate ligand. Thus no association between an individual's NK receptor repertoire and HLA serotype could be demonstrated. It is concluded that CD158 is expressed on NK cells in a highly redundant fashion. Our data do not support either a positive selection mechanism or the receptor calibration model.
journal_name
Immunologyjournal_title
Immunologyauthors
Frohn C,Schlenke P,Kirchner Hdoi
10.1046/j.1365-2567.1997.00374.xsubject
Has Abstractpub_date
1997-12-01 00:00:00pages
567-70issue
4eissn
0019-2805issn
1365-2567journal_volume
92pub_type
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