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The Journal of Immunology, Vol 149, Issue 4 1185-1190, Copyright © 1992 by American Association of Immunologists

ARTICLES

Peptide-induced modulation of target cell sensitivity to natural killing

WJ Storkus, RD Salter, P Cresswell and JR Dawson
Department of Surgery, University of Pittsburgh School of Medicine, PA 15261.

We have previously shown that the capacity of class I molecules to confer resistance to NK in transfected target cells maps to the Ag- binding site (ABS) of the HLA class I structure. Here we examine the effect of peptide (reagents specific for the ABS) pretreatment on the NK sensitivity of class I+ target cells. Synthetic peptides (10-17 amino acids in length) were used to pretreat C1R target cells expressing either no serologically detectable HLA-A, B class I molecules, or C1R transfectants expressing individual HLA-A or -B locus class I molecules. In each case in which the class I allele had previously been shown to directly bind a given peptide, peptide-pulsing of target cells resulted in increased sensitivity to NK-mediated conjugation and cytolysis. The NK susceptibility of C1R target cells expressing no HLA-A, B class I molecules or the nonprotective HLA-A2.1 or HLA-A2M70 mutant class I molecules was unaffected by pretreatment with HLA-A2-binding peptides. These results support the intimate involvement of the HLA class I ABS and potentially ABS-bound peptides in determining target cell sensitivity to NK. Furthermore, these findings form the basis of an effective screening procedure for discerning peptide class I allele-specific interactions.


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