Different MHC class I alleles compete for presentation of overlapping viral epitopes

Immunity
L G TusseyA J McMichael

Abstract

We previously identified an HLA-B8+ donor, NW, whose lymphoblastoid cells failed to present a B8-restricted epitope from the influenza A nucleoprotein following viral infection, although added peptide could still be presented. The failure to present through HLA-B8 following viral infection appears to be specific for the NP epitope. Here, we report that donor NW makes an HLA-B2702-restricted influenza-specific CTL response to an epitope in the nucleoprotein that overlaps the B8-restricted epitope by 8 aa. Two mechanisms for the failure of this cell line to present the B8-restricted epitope following viral infection are investigated. One is that there is an antigen processing polymorphism specific to the NW cell line, so that there is either preferential generation or preferential transport of the B2702 epitope. The other is that B8 and B2702 compete for a common peptide fragment in the ER and this leads to suboptimal loading of HLA-B8.

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