Mice completely lacking immunoproteasomes show major changes in antigen presentation.

Mice completely lacking immunoproteasomes show major changes in antigen presentation.
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DOI:
10.1038/ni.2203
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发表时间:
2011-12-25
期刊:
影响因子:
30.5
通讯作者:
Rock, Kenneth L.
Rock, Kenneth L.
中科院分区:
医学1区
文献类型:
--
作者:
Kincaid, Eleanor Z.;Che, Jenny W.;York, Ian;Escobar, Hernando;Reyes-Vargas, Eduardo;Delgado, Julio C.;Welsh, Raymond M.;Karow, Margaret L.;Murphy, Andrew J.;Valenzuela, David M.;Yancopoulos, George D.;Rock, Kenneth L.

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The importance of immunoproteasomes to antigen presentation has been unclear because animals totally lacking immunoproteasomes have not been previously developed. Here we show that dendritic cells from mice lacking the three immunoproteasome catalytic subunits display defects in presenting multiple major histocompatability (MHC) class I epitopes. During viral infection in vivo, the presentation of a majority of MHC class I epitopes is markedly reduced in immunoproteasome-deficient animals, while presentation of MHC class II peptides is unaffected. By mass spectrometry the repertoire of MHC class I-presented peptides is ~50% different and these differences are sufficient to stimulate robust transplant rejection of wild type cells in mutant mice. These results indicate that immunoproteasomes play a much more important role in antigen presentation than previously thought.
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