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Hrd1-mediated BLIMP-1 ubiquitination promotes dendritic cell MHCII expression for CD4 T cell priming during inflammation.

J. Exp. Med.2014 Nov 17;211(12):2467-79. Epub 2014 Nov 03
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摘要


The ubiquitin pathway plays critical roles in antigen presentation. However, the ubiquitin ligases that regulate MHC gene transcription remain unidentified. We showed that the ubiquitin ligase Hrd1, expression of which is induced by Toll-like receptor (TLR) stimulation, is required for MHC-II but not MHC-I transcription in dendritic cells (DCs). Targeted Hrd1 gene deletion in DCs diminished MHC-II expression. As a consequence, Hrd1-null DCs failed to prime CD4(+) T cells without affecting the activation of CD8(+) T cells. Hrd1 catalyzed ubiquitination and degradation of the transcriptional suppressor B lymphocyte-induced maturation protein 1 (BLIMP1) to promote MHC-II expression. Genetic suppression of Hrd1 function in DCs protected mice from myelin oligodendrocyte glycoprotein (MOG)-induced experimental autoimmune encephalomyelitis (EAE). We identified Hrd1-mediated BLIMP1 ubiquitination as a previously unknown mechanism in programming DC for CD4(+) T cell activation during inflammation.

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