Human cytolytic T lymphocytes expressing HLA class-I-specific inhibitory receptors

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Abstract

MHC class-1-specific inhibitory receptors were originally described in NK cells, in which they represent an important fail-safe mechanism that induces NK cell tolerance to normal self cells. These inhibitory NK receptors (iNKRs) were subsequently found expressed on different T cell subsets, primarily CD8 + cytolytic T lymphocytes (CTLs), in which they can inhibit T cell receptor mediated functions. Some iNKR+ CTLs are HLA-E-restricted, represent oligo- or monoclonal expansions, and can play a defensive role in viral infections. Although T cell activation, in the presence of certain cytokines, can induce the expression of the CD94-NKG2A heterodimeric receptor, the mechanism leading to the expression of killer immunoglobulin-like receptors (KIRs) is still unknown. The expression of iNKRs in T cells might contribute to the prevention of apoptotic cell death, thus allowing their survival and clonal expansion in vivo. In addition, iNKR+ T cells might contribute to peripheral self-tolerance.

Original languageEnglish
Pages (from-to)312-319
Number of pages8
JournalCurrent Opinion in Immunology
Volume17
Issue number3
DOIs
Publication statusPublished - Jun 2005

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy

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