T cell receptor (TCR) ligand discovery is essential for understanding and manipulating immune responses to tumors. We developed a cell-based selection platform for TCR ligand discovery that exploits a membrane transfer phenomenon called trogocytosis. We discovered that T cell membrane proteins are transferred specifically to target cells that present cognate peptide–major histocompatibility complex (MHC) molecules. Co-incubation of T cells expressing an orphan TCR with target cells collectively presenting a library of peptide–MHCs led to specific labeling of cognate target cells, enabling isolation of these target cells and sequencing of the cognate TCR ligand. We validated this method for two clinically employed TCRs and further used the platform to identify the cognate neoepitope for a subject-derived neoantigen-specific TCR. Thus, target cell trogocytosis is a robust tool for TCR ligand discovery that will be useful for studying basic tumor immunology and identifying new targets for immunotherapy.
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The original NGS DNA-seq data have been deposited in the Sequence Read Archive under accession numbers SRR8217181, SRR8217182 and SRR8217183. The data that support the findings of this study are available from the corresponding author upon request. Source data for Figs. 2, 4 and 5 are available online.
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We thank I. Antoshechkin (Millard and Muriel Jacobs Genetics and Genomics Laboratory, Caltech) for deep DNA sequencing, and D. Perez, J. Tijerina and R.A. Diamond (Flow Cytometry Facility, Caltech) for cell sorting. This work was supported by the Prostate Cancer Foundation Challenge Award 15CHAL02 to D.B., O.N.W., L.Y. and M.T.B., and the National Cancer Institute (grant 1U54 CA199090-01 to J.R.H.). M.T.B. is the recipient of a Jane Coffin Childs Postdoctoral Fellowship. A.R. was supported by National Institutes of Health (NIH) grant R35 CA197633. G.L. was supported by the Parker Institute for Cancer Immunotherapy. J.T.K. was supported by NIH/National Center for Advancing Translational Science UCLA CTSI grant KL2TR001882.
M.T.B., G.L., J.T.K., S.W. and D.B. are co-inventors on a patent application concerning the described technology, which is licensed to PACT Pharma, Inc. J.R.H. and A.R. are directors and consultants of PACT; D.B. is a consultant of PACT and head of their scientific advisory board; M.T.B. and S.P. are employees of PACT; J.M.Z. is a consultant of PACT; and each of the foregoing individuals has equity interests in PACT.
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Integrated supplementary information
Supplementary Figure 1 Establishment of Jurkat cells expressing F5 TCR or 1G4 TCR and K562 cells expressing single-chain trimer (SCT) of HLA-A2/MART126-35(A27L) or HLA-A2/NYESO1157-165(C165V).
(a) A retroviral vector co-delivered F5 TCR or 1G4 TCR genes carrying either human or murine TCR constant regions together with LNGFRΔ, a transduction marker comprising low-affinity nerve growth factor receptor with the intracellular domain truncated, to Jurkat cells. A lentiviral vector co-delivered an SCT containing MART1 or NYESO1 peptide with ZsGreen as a transduction marker to K562 cells. SCTs are composed of a single polypeptide chain with a linear composition of antigenic peptide, β2-microglobulin, and HLA-A2 domains via flexible glycine-serine linkers. (b) Resolution via flow cytometry of Jurkat and K562 cells. The Jurkat T cells and K562 cells were resolved by gating on the LNGFR+ population and the ZsGreen+ population, respectively.
(a) ZsGreen cannot be transferred from K562 cells to Jurkat cells. Representative flow cytometry plot of Zsgreen level in F5-CD8-Jurkat or 1G4-CD8-Jurkat following co-incubation with MART1-K562. (b,c)The kinetics of trogocytosis for TCR–cognate pMHC interaction. Co-incubation of 1G4-CD8-Jurkat cells with NYESO1-K562 or F5-CD8-Jurkat cells with MART1-K562 for indicated time and trogocytosis was assessed using anti-muTCR antibody (n = 3). Data are presented as mean ± s.e.m. (d) Immunofluorescence staining of co-incubated F5-CD8-Jurkat with NYESO-K562 (Zsgreen+) or MART1-K562 (Zsgreen+) by MART1 pMHC dextramer (yellow). Data in this figure are representative of at least two independent experiments.
(a) Antigen-specific transfer of the T cell membrane proteins, CD3 and CD8, from CD8-expressing F5-Jurkat and 1G4-Jurkat cells to K562 cells (ZsGreen+), as assessed by anti-CD3 and anti-CD8 antibodies (5:1 J:K). (b) Antigen-specific transfer of the K562 cell membrane protein, HLA-A2, from K562 cells to Jurkat cells (ZsGreen–), as assessed by an anti-HLA-A2 antibody (5:1 J:K). (c, d) Concomitant reduction of membrane proteins from donor cells. Data are representative of three independent experiments.
(a) Antigen-specific trogocytosis between Jurkat expressing B07-, B18- or C03-restricted NY-ESO-1-specific TCRs and K562 expressing their cognate antigens (10:1 J:K). (b) Comparison of trogocytosis capability 1G4-Jurkat cells or Jurkat cell expressing four other novel A2-restricted NYESO-specific TCRs with NYESO1-K562 cells (10:1 J:K). (c) Comparison of trogocytosis capability F5-Jurkat cells or Jurkat cell expressing low-affinity M1W-TCR with MART1-K562 cells (5:1 J:K). Data are presented as mean ± s.e.m. and are representative of two independent experiments.
Supplementary Figure 5 Antigen-specific TCR transfer occurs from donor cells to acceptor cells regardless of cell identity.
(a) Antigen-specific transfer of TCR after co-incubation of a 5:1 ratio of F5 or 1G4 TCR-K562 cells and MART1 or NYESO1 SCT-Jurkat cells (ZsGreen+) as assessed by an anti-muTCR antibody. (b) Antigen-specific transfer of TCR after same-cell-type co-incubation of a 5:1 ratio of F5 or 1G4 TCR-K562 and MART1 or NYESO1 SCT-K562 (ZsGreen+) as assessed by an anti-muTCR antibody. (c) Antigen-specific transfer of TCR after co-incubation of a 1:1 ratio of F5 or 1G4 TCR-Jurkat and MART1 or NYESO1 SCT-Jurkat (ZsGreen+) as assessed by an anti-muTCR antibody. Mean and s.e.m. for each group is shown (n = 3). Data are representative of two independent experiments.
Supplementary Figure 6 Histographic visualization of trogocytosis capability based on peptide dosing and variants.
(a) Comparison of trogocytosis capability of murinized F5-Jurkat cells with A2-K562 cells loaded with different doses of cognate MART1 heteroclitic peptide (ELAGIGILTV). (b) Comparison of trogocytosis capability of murinized 1G4-Jurkat cells with A2-K562 cells loaded with different doses of cognate NYESO1 heteroclitic peptide (SLLMWITQV). (c) Comparison of trogocytosis capability of murinized F5-Jurkat cells with A2-K562 cells loaded with same dose of different MART1 peptide variants. (d) Comparison of trogocytosis capability of murinized 1G4-Jurkat cells with A2-K562 cells loaded with same dose of different NYESO1 peptide. Data are representative of two independent experiments.
(a) Comparison of trogocytosis capability of CD8+ or CD8– murinized F5-Jurkat cells with MART1-K562 or NYESO1-K562 cells. (b) Comparison of trogocytosis capability of CD8+ or CD8– murinized 1G4-Jurkat cells with MART1-K562 or NYESO1-K562 cells. (c) Comparison of trogocytosis capability of CD8+ or CD8– M1W-Jurkat cells with MART1-K562 cells. Data are representative of two independent experiments.
Supplementary Figure 8 Target cell trogocytosis resolves cognate antigen-expressing target cells from noncognate antigen-expressing cells.
(a) Schematic of experiment. (b) Representative flow cytometry plots for a 1:1 mixture of NYESO1-K562 and MART1-K562 cells co-incubated with either 1G4-Jurkat (top) or F5-Jurkat (bottom) cells (10:1:1 Jurkat: NYESO1-K562:MART1-K562). The trogocytosis+ and trogocytosis– populations were verified for antigen specificity by use of either F5 TCR or 1G4 TCR dextramer staining. Data are representative of two independent experiments. (c) Quantification of antigen-specific target cell in trogocytosis+ and trogocytosis– populations via F5 TCR or 1G4 TCR dextramer staining (n = 3). Statistical analysis of quantification was performed using unpaired two-tailed Student’s t-test. Data in b, c are presented as mean ± s.e.m. and are representative of two independent experiments.
Supplementary Figure 9 Flow cytometry plot for the first- and second-round sortings from co-incubation.
(a,b,c) F5-Jurkat, 1G4-Jurkat or neoTCR-Jurkat cells (E2-Crimson+CD8+) were co-incubated with K562 library cells and trogocytosis+ A2-SCT-K562 cells (E2-Crimson–eGFP+TCR+) in red box were gated for sorting using FACS. Data are representative of two or three independent experiments.
Supplementary Figure 10 Comparison of trogocytosis capacity of NeoTCR-CD8-Jurkat cells with MART1-K562, USP7mut-K562 or USP7wt-K562 cells.
The predicted affinity of mutUSP7 and wtUSP7 for the HLA-A2 binding groove by NetMHC are 33 nM and 7 μM, respectively. Data are presented as mean ± s.e.m. (n = 3) and are representative of two independent experiments.
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Li, G., Bethune, M.T., Wong, S. et al. T cell antigen discovery via trogocytosis. Nat Methods 16, 183–190 (2019). https://doi.org/10.1038/s41592-018-0305-7
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