Abstract
Most of what we know about adaptive immunity has come from inbred mouse studies, using methods that are often difficult or impossible to confirm in humans. In addition, vaccine responses in mice are often poorly predictive of responses to those same vaccines in humans. Here we use human tonsils, readily available lymphoid organs, to develop a functional organotypic system that recapitulates key germinal center features in vitro, including the production of antigen-specific antibodies, somatic hypermutation and affinity maturation, plasmablast differentiation and class-switch recombination. We use this system to define the essential cellular components necessary to produce an influenza vaccine response. We also show that it can be used to evaluate humoral immune responses to two priming antigens, rabies vaccine and an adenovirus-based severe acute respiratory syndrome coronavirus 2 vaccine, and to assess the effects of different adjuvants. This system should prove useful for studying critical mechanisms underlying adaptive immunity in much greater depth than previously possible and to rapidly test vaccine candidates and adjuvants in an entirely human system.
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Data availability
Requests for raw data, analyzed data and materials will be reviewed by Stanford University to determine if the request is subject to intellectual property or confidentiality obligations. Data and materials that can be shared will be released using a Material Transfer Agreement. Targeted single-cell RNA-seq data are available in the Gene Expression Omnibus under GSE158459.
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Acknowledgements
The authors thank the participants for donating their tissues for this study; J. Cyster, J. Idoyaga and B. Pulendran for thoughtful comments on the manuscript; M. Leipold, C. Tato and R. DiFazio for insightful discussions and troubleshooting suggestions; A. Messner, C. Lopez Angel, R. Cadman, A. Nguyen and H. Song for their assistance with collecting tonsillectomy samples; the Gift of Hope Organ and Tissue Donor Network and J. Solway for tissue procurement through the Gift of Hope; Mike Laine for materials development advice; Mary Rieck for sorting assistance; X. Ji, M. Miranda, I. Goncharov and H. Maecker for single-cell RNA-seq help; and the Cell Sciences Imaging Facility and the Stanford Shared FACS Facility for instrument access. This work was supported by a Bill and Melinda Gates Foundation pilot grant (OPP1113682; to M.M.D.), the National Institutes of Health (NIH) grants (5U19AI05722915 to M.M.D.; 1R01AI127877 and 1R01AI130398 to S.D.B.; U54CA224081, U19AI116484, U01CA217851 and U01DK085527 to C.J.K.) and the Howard Hughes Medical Institute (to M.M.D.). Sorting and analyzing were performed in the Stanford Shared FACS facility on instruments supported by the NIH S10 Shared Instrument Grants (S10RR025518-01 and S10RR027431-01) and the Parker Institute for Cancer Immunotherapy.
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L.E.W., A.S., C.J.K. and M.M.D. conceived the study and guided it throughout; L.E.W., A.S., C.M.C., B.S.W., M.M.L., V.M., L.P.J., J.Z.A., L.K.B., N.G., F.Y., K.J.L.J., K.R. and K.M.R. performed experiments and/or analyzed and interpreted data; L.E.W., A.I.S., K.M.B., K.D.M., I.N.A., G.B.H., P.S.K., W.H.R., S.D.B., C.J.K. and M.M.D. contributed to sample acquisition efforts, assay development or conceptual design of the study; M.M.L., M.C., E.G.D. and S.N.T. developed and produced antigens; L.E.W. and M.M.D. wrote the paper, and all authors reviewed and approved the manuscript.
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S.N.T., M.C. and E.G.D. are employed and have stock options with the biotechnology company Vaxart. P.L.F. and D.H.D. have shares in Nanommune, a company that uses Sino Biological’s proteins on commercially available protein microarrays. L.E.W., A.S., C.M.C., B.S.W., M.M.L., V.M., L.P.J., J.Z.A., L.K.B., N.G., K.J.L.J., F.Y., K.R., K.M.R., K.M.B., K.D.M., I.N.A., A.I.S., A.J., G.B.H., P.S.K., W.H.R., S.D.B., C.J.K. and M.M.D. declare no competing interests.
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Extended data
Extended Data Fig. 1 Characteristics of B cells from tonsil organoid cultures.
a, Flow cytometry gating scheme on representative unstimulated and LAIV-stimulated cultures. b, Representative ELISpot wells for detection of Ab-secreting cells with influenza vaccine specificity. The number of spots detected are shown in the corner of each well. c, Comparison of organoid cultures grown in standard flat-bottom wells vs. transwells. Data shown are from day 7 LAIV-stimulated cultures (n = 6 donors). p values shown were determined with paired Wilcoxon signed-rank two-sided tests. Boxplots show median values with hinges representing first and third quartiles and whiskers representing the highest and lowest value that is within 1.5X the interquartile range of the hinges. d, Correlation between specific Ab secretion and plasmablast frequency in influenza-stimulated and unstimulated cultures on day 7. Detection of influenza-specific IgG antibodies by semi-quantitative indirect ELISA. Optical density was corrected for background using unspent culture medium as a control. Each donor (n = 15) was tested under four conditions: no stimulation, IIV-stimulated, LAIV-stimulated, or H1N1 WT virus-stimulated. Plasmablast (CD19+ CD38+++ CD27+) frequencies were determined by flow cytometry.
Extended Data Fig. 2 Confocal imaging showing distribution of different cell types and their interactions in tonsil tissue and organoid cultures.
Merge does not include DAPI staining for clarity. a, One fresh tonsil tissue was stained with panels of markers to define T and B cell areas and GC structure. b, Day 4 unstimulated organoid stained for T and B cell markers. c, Day 4 LAIV organoid stained for germinal center markers. d, Day 4 unstimulated organoid stained for B and T cell distribution. e, Day 4 LAIV organoid stained for markers of T follicular helper cells. For organoid cultures (b-e), representative examples are shown from organoid cultures derived from three different donors.
Extended Data Fig. 3 Quantification of organoid organization and function.
a, Quantification of CXCR4 and CD83 expression levels (mean intensity, left panel) and percent positive (percentage of CD20+B cells, right panel) in day 4 tonsil organoids from one donor. Two areas of an LAIV-stimulated organoid (top GC and bottom GC as also shown in Fig. 3a) and a representative GC-organized area from an unstimulated organoid were used for the calculation. b, Representative intracellular AID flow cytometry staining profiles. Data shown are from a day 4, LAIV-stimulated organoid culture. Total B cells were subsetted based on CD38 and CD27 expression and are shown as individual profiles in red compared to a ‘no AID primary antibody’ FMO control in grey.
Extended Data Fig. 4 B cell receptor sequencing from HA-specific B cells.
a, Phylogenetic trees from two donors are shown (top). Day 0 clones are indicated by black points. Different isotypes (IgM, IgA, IgG) are indicated by color (green, blue, and red respectively). Oligoclonal populations and clonal families from single cell data are represented by larger points (open circles). Clonal families were defined as BCR sequences that use the same V and J genes and have at least 70% amino acid identity in the CDR3 region for heavy and light chains. b, FACS staining and B cell phenotypes of HA-specific B cells compared to the total B cell pool.
Extended Data Fig. 5 Tracking individual heavy-chain BCR lineages before and after LAIV stimulation in tonsil organoids show evidence of isotype switching.
Immunoglobulin heavy-chain gene rearrangements for each isotype were sequenced from total memory B cells, germinal center B cells, and plasmablasts sorted from cultures of four donors on days 0 and 7. Heavy-chain BCR sequences from lineages that contained members as only IgM on day 0 and as only isotype-switched on day 7 were compared for their somatic hypermutation levels. For each lineage, the mean SHM was calculated for day 0 IgM members and for day 7 switched members, and the difference between these means was plotted. Lineages with increased mutation are shown in blue and those with decreased mutation in red.
Extended Data Fig. 6 Depletion of pre-existing HA-specific and non-naive B cells do not prevent production of new high-affinity HA+ B cells after organoid culture.
B cells with high affinity BCRs for A/California 2009 HA+ and all non-naive B cells were depleted by FACS and depletion was confirmed by post-sort analysis. After 10 days in organoid culture, cells were harvested, re-stained for A/California HA+ B cells, and run on a flow cytometer. n = 4 donors were tested.
Extended Data Fig. 7 Effects of cell depletion on influenza-specific antibodies and their affinities.
a, Rescue of plasmablast and Ab responses to LAIV stimulation by supplementing pDC-depleted cultures with type I IFNs. b, Frequency of CD4+ T cells (of live cells) in intact and CD4-depleted cultures on day 7. CD4+ cells were depleted by positive selection with magnetic particles. c, Biolayer interferometry data indicating Ab affinity for A/California 2009 H1N1 HA full length, head-specific, and stem domains. Colors are matched to patient samples in (b).
Extended Data Fig. 8 SARS-CoV2-specific Abs detected in organoid cultures stimulated with Ad5 vectored vaccine candidates.
Day 14 post-stimulation culture supernatants were tested for the presence of SARS-CoV2-specific IgM, IgG, and IgA in n = 12 donors. Abs were detected using a protein microarray. Individuals donors are represented by symbols. The signal intensities shown were background subtracted based on unstimulated control cultures from the same donor. Boxplots show median values with hinges representing first and third quartiles and whiskers representing the highest and lowest value that is within 1.5X the interquartile range of the hinges.
Supplementary information
Supplementary Table 1
Lymphoid tissue donor characteristics. Unless otherwise noted in donor name, samples are from palatine tonsillectomy surgeries.
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Wagar, L.E., Salahudeen, A., Constantz, C.M. et al. Modeling human adaptive immune responses with tonsil organoids. Nat Med 27, 125–135 (2021). https://doi.org/10.1038/s41591-020-01145-0
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DOI: https://doi.org/10.1038/s41591-020-01145-0
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