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The Repertoire of Killer Cell Ig-Like Receptor and CD94:NKG2A Receptors in T Cells: Clones Sharing Identical αβ TCR Rearrangement Express Highly Diverse Killer Cell Ig-Like Receptor Patterns

2001; American Association of Immunologists; Volume: 166; Issue: 6 Linguagem: Inglês

10.4049/jimmunol.166.6.3923

1550-6606

Markus Uhrberg, Nicholas M. Valiante, Neil T. Young, Lewis L. Lanier, Joseph H. Phillips, Peter Parham,

CAR-T cell therapy research

Abstract Killer cell Ig-like receptor (KIR) and CD94:NKG2A molecules were first defined as human NK cell receptors (NKR), but now are known to be expressed and to function on subpopulations of T cells. Here the repertoires of KIR and CD94:NKG2A expression by T cells from two donors were examined and compared with their previously defined NK cell repertoires. T cell clones generated from peripheral blood of both donors expressed multiple NKR in different combinations and used the range of receptors expressed by NK cells. In both donors αβ T cells less frequently expressed the inhibitory receptors CD94:NKG2A and KIR2DL1 than either γδ T cells or NK cells. In contrast to NK cells, not all NKR+ T cells expressed an inhibitory receptor for autologous HLA class I. This lack of specific inhibitory NKR was especially apparent on αβ T cells of one donor. Overall, αβ T cells exhibited a distinct pattern of NKR expression different from that of γδ T and NK cells, which expressed highly similar NKR repertoires. In one donor, analysis of TCR rearrangement revealed a dominant subset of NKR+ T cells sharing identical TCR α- and β-chains. Remarkably, among 55 T cell clones sharing the same TCRαβ rearrangement 18 different KIR phenotypes were seen, suggesting that KIR expression was initiated subsequently to TCR rearrangement.