Influenza viruses remain a major public health threat. Seasonal influenza vaccination in humans primarily stimulates pre-existing memory B cells, which differentiate into a transient wave of circulating antibody-secreting plasmablasts1,2,3. This recall response contributes to ‘original antigenic sin’—the selective increase of antibody species elicited by previous exposures to influenza virus antigens4. It remains unclear whether such vaccination can also induce germinal centre reactions in the draining lymph nodes, where diversification and maturation of recruited B cells can occur5. Here we used ultrasound-guided fine needle aspiration to serially sample the draining lymph nodes and investigate the dynamics and specificity of germinal centre B cell responses after influenza vaccination in humans. Germinal centre B cells that bind to influenza vaccine could be detected as early as one week after vaccination. In three out of eight participants, we detected vaccine-binding germinal centre B cells up to nine weeks after vaccination. Between 12% and 88% of the responding germinal centre B cell clones overlapped with B cells detected among early circulating plasmablasts. These shared B cell clones had high frequencies of somatic hypermutation and encoded broadly cross-reactive monoclonal antibodies. By contrast, vaccine-induced B cell clones detected only in the germinal centre compartment exhibited significantly lower frequencies of somatic hypermutation and predominantly encoded strain-specific monoclonal antibodies, which suggests a naive B cell origin. Some of these strain-specific monoclonal antibodies recognized epitopes that were not targeted by the early plasmablast response. Thus, influenza virus vaccination in humans can elicit a germinal centre reaction that recruits B cell clones that can target new epitopes, thereby broadening the spectrum of vaccine-induced protective antibodies.
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Raw fastq files and associated RNA sequencing data have been uploaded to the NCBI Gene Expression Omnibus (GEO) database under identifiers SRP251458 and GSE148633. Antibody sequences are deposited at GenBank under the following accession numbers: MT200037-MT200636, KEB[P-Z]00000000, KEC[A-Z]00000000, KED[A-Z]00000000, and KEE[A-F]00000000, available from GenBank/EMBL/DDBJ. The template switch sequences, constant region primers, and isotype-specific internal constant region sequences that were used in these studies are available at https://bitbucket.org/kleinstein/immcantation/src/master/protocols/AbSeq/. The 3D reconstructions are deposited to the Electron Microscopy Data Bank (EMDB) under the following accession numbers: EMD-21703, EMD-21710, EMD-21733, EMD-21734, EMD-21737, EMD-21765, EMD-21809, EMD-21768, EMD-21776, EMD-21778, EMD-21779, EMD-21780, EMD-21782, EMD-21783 (participant 4 polyclonal immune complexes); EMD-21739, EMD-21741, EMD-21745, EMD-21746, EMD-21750, EMD-21784, EMD-21785, EMD-21786, EMD-21787, EMD-21788, EMD-21792, EMD-21793, EMD-21797, EMD-21798, EMD-21799, EMD-21800, EMD-21802 (participant 5 polyclonal immune complexes); EMD-21714, EMD-21715, EMD-21717, EMD-21719, EMD-21722, EMD-21723, EMD-21726, EMD-21729, EMD-21730, EMD-21731, EMD-21751, EMD-21752, EMD-21754, EMD-21803, EMD-21804, EMD-21806, EMD-21808 (participant 11 polyclonal immune complexes); EMD-21757, EMD-21758, EMD-21759, EMD-21760, EMD-21761, EMD-21762, EMD-21763 (monoclonal immune complexes). Other relevant data are available from the corresponding author upon reasonable request. Source data are provided with this paper.
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We thank K. Hoehn for discussion on phylogenetic analysis, A. Boon and H. Harastani for providing A/California/04/2009 E3 (H1N1) virus; E. Lantelme for facilitating sorting; L. Kessels, M. Royal and the staff of the Infectious Diseases Clinical Research Unit at Washington University School of Medicine for assistance with vaccination and sample collection; P. G. Thomas and A. Sant for critically reading the manuscript; the Yale Center for Research Computing for use of high-performance computing infrastructure; the Genome Technology Access Center (GTAC) in the Department of Genetics at Washington University School of Medicine and the Yale Center for Genome Analysis for help with genomic analysis. The GTAC is partially supported by NCI Cancer Center Support Grant P30 CA91842 to the Siteman Cancer Center and by ICTS/CTSA Grant UL1 TR000448 from the NCRR. The Ellebedy laboratory was supported by NIAID grants R21 AI139813 and U01 AI141990, and NIAID Centers of Excellence for Influenza Research and Surveillance (CEIRS) contract HHSN272201400006C. The Kleinstein laboratory was supported by NIH grant R01AI10473 and HIPC-CEIRS grant U19AI089992. The Ward laboratory was supported by Collaborative Influenza Vaccine Innovation Centers contract 75N93019C00051-0-9999-1. The Krammer laboratory was supported by NIAID CEIRS contract HHSN272201400008C and NIAID grants AI117287 and AI128821. J.S.T. was supported by NIAID 5T32CA009547. J.H. was supported by NIAID 2 T32 AI007244-36. The WU321 study was reviewed and approved by the Washington University Institutional Review Board (approval no. 201808171). The manuscript was edited by the Scientific Editing Service of the Institute of Clinical and Translational Sciences at Washington University, which is supported by an NIH Clinical and Translational Science Award (UL1 TR002345).
A.H.E. is a consultant for InBios and Fimbrion Therapeutics. The Ellebedy laboratory received funding unrelated to this work under sponsored research agreements from Emergent BioSolutions. All other authors declare no competing interests.
Peer review information Nature thanks Antonio Lanzavecchia and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Peer reviewer reports are available.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data figures and tables
a, ELISpot quantification of QIV-binding IgG-, IgM- and IgA-secreting PBs in blood 1 week after vaccination. Each symbol represents one participant (n = 8). b–e, Flow cytometry (b, c) and sorting (d, e) gating strategies for PBMCs (b, d) and FNA (c, e). Population counts per ml of blood and frequencies are presented in f and in Figs. 1d, 2f and Extended Data Fig. 2c, m. f, Kinetics of HA-binding PBs (CD20lo HA+, open triangles) and activated B cells (ABCs) (CD20+ HA+, closed circles) in PBMCs, gated as in Fig. 1c, pre-gated IgDlo CD19+ CD4− live singlet lymphocytes as in b. Symbols at each time point represent one sample (n = 8). g, h, IgG plasma antibody titres against QIV and Tetanus/Diphtheria vaccine measured by ELISA (g) and haemagglutination inhibition titres against QIV-constituent viruses (h) before and 4 weeks after vaccination. Symbols at each time point represent one sample (n = 8). Horizontal lines in a, g and h represent means. Dotted lines represent limit of detection. P values were determined by paired two-sided Student’s t-tests.
a, Cortical thickness measurements of axillary lymph nodes before each FNA collection. b, FNA cell yields for each participant at the indicated time point. Symbols at each time point represent one sample (n = 7). c, Participant 02 percentages of CD19+ CD4− B cells (left), CD14− CD4+ T cells (middle), and CD14+ CD4− monocytes or granulocytes (right) of CD45+ in PBMCs (red) and FNA (blue) from one set of paired samples, representative of five FNA samples. d, Unsupervised clustering via tSNE based on scRNA-seq gene expression of all cells pooled from all samples and time points from participant 05. Each dot represents a cell, coloured by phenotype as defined by gene expression profile. e, Dot plot showing the average log-normalized expression of a set of marker genes and the fraction of cells expressing the genes in each unsupervised cluster. f, g, Annotated tSNE clusters of all cells from all scRNA-seq samples (f) and IgDlo enriched B cells from PBMC scRNA-seq samples (g) pooled from all time points from participant 05. Total number of cells is below clusters. h, Dot plot for annotated clusters. i, Representative flow cytometry gating of BCL6 expression within CD20hi CD38int cells in PBMC and FNA. Cells pre-gated IgDlo CD19+ CD4− live singlet lymphocytes. j, Representative histographs (top) and median fluorescence intensity (bottom) of the indicated markers on GC B cells (IgDlo CD20hi CD38int) compared to PBs (IgDlo CD20− CD38+), memory B cells (IgDlo CD27+ CD38−), and naive B cells (IgD+ CD27−). All populations pre-gated CD19+ CD4− live singlet lymphocytes. MFIs from 2- or 4-week FNA samples from participants 04, 05, 07, 08, 09 and 11. Lines represent medians. k, Representative gating of HA+ GC B cells. Cells pre-gated CD20hi CD38int IgDlo CD19+ CD4− live singlet lymphocytes. l, Kinetics of HA-binding percent of GC B cells measured by flow cytometry in participants 04, 05 and 11. m, Kinetics of HA+ CD38+ CD20lo PBs (open triangles) and HA+ CD38− CD20+ activated B cells (closed circles) in FNA, as gated in Extended Data Fig. 1c. Symbols at each time point represent one sample (n = 7). Daggers denote samples excluded from analysis due to low cell recovery or blood contamination.
a, Schematic of single-cell monoclonal antibody cloning and expression. Paired heavy and light chain genes were amplified from singly sorted PBs or GC B cells. Variable portions of heavy chains were cloned into a Cγ1 expression vector and variable portions of κ and λ light chains were cloned into respective expression vectors. Paired heavy and light chain expression vectors were co-transfected into 293F cells, and monoclonal antibodies were purified from culture supernatant by protein A affinity chromatography, then screened for QIV specificity by ELISA. b, c, Minimum positive concentrations of clonally unique monoclonal antibodies generated from singly sorted PBs (b) and GC B cells (c) from the indicated participants as determined by QIV ELISA; positive binding defined as greater than 3× background. d,Distance-to-nearest-neighbour plots for choosing a distance threshold for inferring clones via hierarchical clustering. After partitioning sequences based on common V and J genes and junction length, the nucleotide Hamming distance of a junction to its nearest non-identical neighbour from the same participant within its partition was calculated and normalized by junction length (blue histogram). For reference, the distance to the nearest non-identical neighbour from other participants was calculated (green histogram). A clustering threshold of 0.1 (dashed black line) was chosen via manual inspection and kernel density estimate (dashed purple line) to separate the two modes of the within-participant distance distribution representing, respectively, sequences that were probably clonally related and unrelated. e, Clonal overlap of sequences from monoclonal antibody cloning and bulk repertoire analysis between PBs sorted from PBMCs 1 week after vaccination and GC B cells from the indicated time point among total (top) and only QIV-binding (bottom) sequences. Purple chords link overlapping GC and PB clones; black chords link GC clones found at multiple time points that did not participate in the early PB response. Chord width corresponds to clonal population size. Percentages are of GC sequences overlapping with PBs. f, Clonal rank-abundance distributions of GC B cells from indicated time points (left) and of early blood PBs (right). The number of GC B cells or early blood PBs in a clone as a percentage of the total GC or early blood PB repertoire (y axis) is plotted against the abundance rank of that clone (x axis). Solid lines represent the estimated clonal abundance curves, with shaded bands representing the 95% confidence intervals from 200 bootstraps. g, tSNE clusters of B cells from FNA scRNA-seq samples from participant 05. Each dot represents a cell, coloured by phenotype as defined by gene expression profile. Total numbers of cells are given below clusters. GC percentages are indicated in blue. h, IGHV mutation frequency of naive B cells pooled from all time points (left) and the indicated populations at the indicated time point (right) from scRNA-seq of whole and memory B cell-enriched PBMC and FNA samples from participant 05. Horizontal lines represent medians. P values were determined by two-sided Dunn’s multiple comparisons test.
a, tSNE plot showing unsupervised clusters based on scRNA-seq gene expression of cells in the ‘B cell’ cluster of Extended Data Fig. 2f, pooled from all samples and time points from participant 05. b, Dot plot showing the average log-normalized expression of a set of marker genes and the fraction of cells expressing the genes in each unsupervised cluster. c, tSNE plot showing BCR availability. d, tSNE plot showing interim annotated clusters. e, Dot plot for interim annotated clusters. f, tSNE plot showing final annotated clusters. g, Dot plot for final annotated clusters. h, tSNE plot showing IHGV mutation frequency in BCRs. Total numbers of cells are given below clusters. i, Bar plots showing isotype usage in annotated B cell clusters. Numbers of cells per cluster are in Extended Data Table 1.
a–c, Influenza virus protein microarray binding of H1- (a), H3- (b) and influenza B/HA- (c) binding monoclonal antibodies generated from singly sorted PBs and GC B cells that overlapped clonally (purple) or did not overlap (red and blue) from the indicated participant. Scale bar represents median fluorescence intensity. Asterisks denote HAI+ monoclonal antibodies. Vaccine strains in bold type; underlined strains circulated in humans in participants’ lifetimes. d, Percentages of monoclonal antibodies that bound two or more HA strains from participants 04, 05 and 11 from GC clones that did not participate in the early PB response (blue), clones that participated in both GC and early PB responses (purple), and from PB clones not found in GCs (red). Numbers of monoclonal antibodies are indicated in the middle of the charts. e, Polyclonal epitopes of Fabs from plasma at indicated time points from participants 04, 05 and 11 with HA from A/Singapore/INFIMH-16-0019/2016. Epitopes were determined by 3D reconstructions and/or 2D class averages (images to bottom right of 3D reconstructions). HA proteins shown in grey; Fabs shown in multiple colours; Fabs with dashed outlines have predicted epitopes due to limited particle representation. f, g, Example 2D class averages of immune complexes from participants 04, 05 and 11 plasma with HA from A/Michigan/45/2015 (f) and A/Singapore/INFIMH-16-0019/2016 (g). h, i, Monoclonal and polyclonal epitopes of immune complexes with HA from A/Michigan/45/2015 (h) or A/Singapore/INFIMH-16-0019/2016 (i) and Fabs generated from indicated GC monoclonal antibodies in blue or purple mesh and plasma polyclonal antibodies in red. Fabs with dashed outlines have predicted epitopes due to limited particle representation. j, k, Example 2D class averages of immune complexes from the indicated mAb with HA from A/Michigan/45/2015 (j) and A/Singapore/INFIMH-16-0019/2016 (k).
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Turner, J.S., Zhou, J.Q., Han, J. et al. Human germinal centres engage memory and naive B cells after influenza vaccination. Nature 586, 127–132 (2020). https://doi.org/10.1038/s41586-020-2711-0
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