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• W2113254966 abstract "Abstract Upon Ag exposure, most memory T cells undergo restimulation-induced cell death. In this article, we describe a novel synthetic agonist, an N-terminal extended decamer peptide expressed as a single-chain trimer, the amino-terminal extended peptide MHC class I single-chain trimer (AT-SCT), which preferentially promotes the growth of memory human CD8+ T cells with minimal restimulation-induced cell death. Using CMV pp65 and melanoma gp100 Ags, we observe the in vitro numerical expansion of a clonally diverse polyfunctional population of Ag-specific CD8+ T cells from healthy individuals and vaccinated melanoma patients, respectively. Memory CD8+ T cells stimulated with AT-SCT presented on MHC class I/II-null cells show reduced cytokine production, slower kinetics of TCR downregulation, and decreased cell death compared with native nonamer MHC class I single-chain trimer (SCT)-activated T cells. However, both ERK phosphorylation and cell cycle kinetics are identical in AT-SCT– and SCT-activated T cells. Probing of SCT and AT-SCT peptide–MHC complexes using fluorochrome-conjugated TCR multimers suggests that nonamer- and decamer-linked peptides may be anchored differently to the HLA-A2 peptide-binding groove. Our findings demonstrate that modified peptide–MHC structures, such as AT-SCT, can be engineered as T cell agonists to promote the growth and expansion of memory human CD8+ T cells." @default.
• W2113254966 created "2016-06-24" @default.
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• W2113254966 date "2012-06-15" @default.
• W2113254966 modified "2023-10-14" @default.
• W2113254966 title "Amino-Terminal Extended Peptide Single-Chain Trimers Are Potent Synthetic Agonists for Memory Human CD8+ T Cells" @default.
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• W2113254966 doi "https://doi.org/10.4049/jimmunol.1103647" @default.
• W2113254966 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3370155" @default.
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• W2113254966 hasPublicationYear "2012" @default.
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