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Simultaneous Identification of Functional Antigen-Specific CD8 + and CD4 + Cells after In Vitro Expansion Using Elongated Peptides.
Cells 2022 October 32
Elongated peptides (EPs), containing possibly one or multiple epitope/s, are increasingly used for the screening of antigen-specific CD8+ and CD4+ cell responses. Here, we present an in vitro protocol that allows the amplification of antigen-specific cells and the subsequent functional analysis of both T cell types using EPs. Known viral-derived epitopes were elongated to 20 mer EPs on the N-, C-, and both termini for HLA class I binders, or on the N- and C- termini for HLA class II binders. With EP stimulation only, the percentage of responding CD8+ T cells was dependent on the elongation site of the EP, whereas CD4+ T cell responses were completely lost in 22% of the tests performed ex vivo. A short-term amplification step plus the addition of a TLR3 agonist (Poly-ICLC) together with an increased EP concentration improved markedly the detection of CD8+ and CD4+ T cell reactivities.
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