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- W2142598127 abstract "Major histocompatibility complex class II molecules (MHC-II) on antigen presenting cells (APCs) engage the TCR on antigen-specific CD4 T cells, thereby providing the specificity required for T cell priming and the induction of an effective immune response. In this study, we have asked whether antigen-loaded dendritic cells (DCs) that have been in contact with antigen-specific CD4 T cells retain the ability to stimulate additional naïve T cells. We show that encounter with antigen-specific primed CD4 T cells induces the degradation of surface MHC-II in antigen-loaded DCs and inhibits the ability of these DCs to stimulate additional naïve CD4 T cells. Cross-linking with MHC-II mAb as a surrogate for T-cell engagement also inhibits APC function and induces MHC-II degradation by promoting the clustering of MHC-II present in lipid raft membrane microdomains, a process that leads to MHC-II endocytosis and degradation in lysosomes. Encounter of DCs with antigen-specific primed T cells or engagement of MHC-II with antibodies promotes the degradation of both immunologically relevant and irrelevant MHC-II molecules. These data demonstrate that engagement of MHC-II on DCs after encounter with antigen-specific primed CD4 T cells promotes the down-regulation of cell surface MHC-II in DCs, thereby attenuating additional activation of naïve CD4 T cells by these APCs." @default.
- W2142598127 created "2016-06-24" @default.
- W2142598127 creator A5029421637 @default.
- W2142598127 creator A5031819059 @default.
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- W2142598127 date "2012-11-05" @default.
- W2142598127 modified "2023-10-10" @default.
- W2142598127 title "Encounter with antigen-specific primed CD4 T cells promotes MHC class II degradation in dendritic cells" @default.
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- W2142598127 doi "https://doi.org/10.1073/pnas.1213868109" @default.
- W2142598127 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3511074" @default.
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