Monomeric TCRs drive T cell antigen recognition.

Monomeric TCRs drive T cell antigen recognition.
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DOI:
10.1038/s41590-018-0092-4
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发表时间:
2018-05
期刊:
影响因子:
30.5
通讯作者:
Huppa JB
Huppa JB
中科院分区:
医学1区
文献类型:
--
作者:
Brameshuber M;Kellner F;Rossboth BK;Ta H;Alge K;Sevcsik E;Göhring J;Axmann M;Baumgart F;Gascoigne NRJ;Davis SJ;Stockinger H;Schütz GJ;Huppa JB

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T-cell antigen recognition requires T-cell antigen receptors (TCRs) binding to MHC-embedded antigenic peptides (pMHCs) within the contact region of a T-cell with its conjugated antigen-presenting cell. Despite micromolar TCR:pMHC affinities, T-cells respond to even a single antigenic pMHC, and higher order TCR-structures have been postulated to maintain high antigen sensitivity and trigger TCR-proximal signaling. We interrogated the stoichiometry of TCRs and their associated CD3 signaling chains on the surface of living primary T-cells with the use of (i) single molecule brightness and (ii) single molecule coincidence analysis, (iii) photon-antibunching based fluorescence correlation spectroscopy and (iv) Förster Resonance Energy Transfer measurements. While all four approaches unambiguously confirmed the accepted subunit ratio within TCR/CD3 complexes, we found exclusively monomeric TCR/CD3 complexes driving the recognition of antigenic pMHCs. Our findings underscore the exceptional capacity of single TCR/CD3 complexes to elicit robust intracellular signaling, which may prove critical for optimizing T-cell-based immunotherapies.
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