PMID: 9177214Jun 10, 1997Paper

Peptides isolated from HLA-Cw*0304 confer different degrees of protection from natural killer cell-mediated lysis

Proceedings of the National Academy of Sciences of the United States of America
F ZappacostaJ E Coligan

Abstract

HLA class I molecules bind peptides derived from proteins degraded in the cytoplasm and display them for surveillance by the immune system. The recognition of HLA class I molecules by natural killer (NK) cells generally inhibits the lytic process. To investigate the role of peptides in the interaction between HLA class I molecules and NK receptors, we first had to identify representative endogenous peptides. Individual peptides bound to HLA-Cw*0304 were isolated and sequenced by tandem mass spectrometry. These peptides ranged in length from 8 to 11 residues and shared an alanine at position 2 and a C-terminal leucine. The murine transporters associated with antigen processing (TAP)-deficient cell line RMA-S was transfected with HLA-Cw*0304 to test whether HLA molecules loaded with a single peptide could deliver the inhibitory signal to NK cells expressing p58.2, which is a killer cell inhibitory receptor known to interact with HLA molecules bearing the HLA-Cw3 public epitope. We found that, in the absence of exogenous peptides, the HLA-Cw*0304 transfectants were killed at levels comparable to untransfected RMA-S cells whereas protection from lysis required both HLA-Cw*0304 heavy chain expression and an exogenously added HLA-Cw*...Continue Reading

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