Curr Opin Immunol. 2001 Apr;13(2):147-53.

Differential processing of class-I-restricted epitopes by the standard proteasome and the immunoproteasome.

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Ludwig Institute for Cancer Research, Brussels Branch, and Cellular Genetics Unit, Université Catholique de Louvain (UCL), Avenue Hippocrate 74, UCL 7459, B-1200, Brussels, Belgium.

Abstract

Upon exposure to IFN-gamma, the standard proteasome is replaced by the immunoproteasome, which contains LMP2, LMP7 and MECL1, and is considered more efficient at producing antigenic peptides presented to CD8(+) T cells. This view has been challenged this year by reports showing that some epitopes, mainly of self origin, are not processed by the immunoproteasome and that mature dendritic cells constitutively express immunoproteasomes and therefore cannot efficiently present such epitopes.

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