Abstract
We performed a systems vaccinology analysis to investigate immune responses in humans to an H5N1 influenza vaccine, with and without the AS03 adjuvant, to identify factors influencing antibody response magnitude and durability. Our findings revealed a platelet and adhesion-related blood transcriptional signature on day 7 that predicted the longevity of the antibody response, suggesting a potential role for platelets in modulating antibody response durability. As platelets originate from megakaryocytes, we explored the effect of thrombopoietin (TPO)-mediated megakaryocyte activation on antibody response longevity. We found that TPO administration enhanced the durability of vaccine-induced antibody responses. TPO-activated megakaryocytes also promoted survival of human bone-marrow plasma cells through integrin β1/β2-mediated cell–cell interactions, along with survival factors APRIL and the MIF–CD74 axis. Using machine learning, we developed a classifier based on this platelet-associated signature, which predicted antibody response longevity across six vaccines from seven independent trials, highlighting a conserved mechanism for vaccine durability.
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Data availability
The accession codes for datasets used in this study are included in Extended Data Table 1. Respective RNA-seq data were mapped to the human (GRCh38) and macaque (Mmul_1) genomes.
Code availability
Code used for data analysis in this study is available at https://github.com/HaganLab/ab_durability.
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Acknowledgements
We thank A. Barrie for help with PBMC processing, N. Patel at the Yerkes NHP Genomics Core for RNA extraction and microarray preparation, S. Bentebibel at the MD Anderson Cancer Center for FACS analysis of T follicular cells, and C. Li, A. Dinasarapu, J. Dan, S. Crotty, R. Ahmed and A. Ellebedy for discussion and valuable feedback. This work was supported by the NIH (R01 AI048638, U19 AI057266 and U19 AI167903), DARPA (81414-BB-DRP), Bill and Melinda Gates Foundation, Open Philanthropy, Anonymous Donor and the Violetta L. Horton and Soffer Endowments to B.P., the Intramural Research Program of NIAID, NIH and NIH intramural support of the Trans-NIH CHI. The Yerkes NHP Genomics Core is supported in part by ORIP/OD P51OD011132 and NIH S10 OD026799. Additional funding for this study was provided by GlaxoSmithKline Biologicals SA (NCT01910519). GlaxoSmithKline Biologicals SA was provided the opportunity to review a preliminary version of this paper for factual accuracy, but the authors are solely responsible for final content and interpretation. The authors received no financial support or other form of compensation related to the development of the paper.
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Conceptualization and formulation of original project, B.P., M.J.M. and N.R.; intellectual contributions throughout project, M. Cortese., T.H. and B.P.; formal analysis, T.H., M. Cortese, F.W., S.G., D.K., H.I.N., H.U., Y.K. and F.C.; investigation, M. Cortese., S.-Y.W., X.X., F.W., P.S.A., R.A., Y.W., E.C., S.H., H.W., H.U. and S.K.; visualization, M. Cortese. and T.H.; writing – original draft, M. Cortese and T.H.; writing – review and editing, M. Cortese, T.H. and B.P.; supervision, B.P., N.R., S.L., S.S., M.J.M. and H.G.; project administration, M. Cortese.; resources, R.v.d.M., M. Coccia, M.B., A.M., C.G., S.E.B., P.L.S., R.N.G. and J.T.; funding acquisition, B.P.
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R.v.d.M., M. Cortese and M. Coccia are or were employees of GSK. B.P. serves or has served on the External Immunology Board of GSK and on the Scientific Advisory Board of Sanofi, Medicago, Boehringer Ingelheim, Pharmajet, Icosavax, Imu Biosciences and Ed-Jen, and holds shares at CircBio and Orbital Therapeutics. R.v.d.M. and T.H. hold shares in the GSK group of companies. The other authors declare no competing interests.
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Extended data
Extended Data Fig. 1 Analysis of kinetics of transcriptional responses.
(a) Scatterplot of the mean log2 FC of all BTMs in adjuvanted participants on day 1 (x axis) and in nonadjuvanted participants on day 3 (y axis). The Pearson correlation coefficient and p value are reported. (b) Kinetics of differential BTMs between day 3 prime and boost. Lines represent average module fold change among adjuvanted participants. The 10 BTMs with the greatest fold change on day 24 are plotted (same as those labeled in Fig. 1g).
Extended Data Fig. 2 Analysis of circulating Tfh cells post-vaccination.
(a) Gating strategy for sorting of four different CD4+ CXCR5+ Tfh populations: quiescent Tfh1, quiescent Tfh2, activated Tfh1, and activated Tfh2. (b) Frequency of activated Tfh cells post-vaccination in adjuvanted (orange) and non-adjuvanted participants (green), defined as percentage of PD1+ICOS+ cells within the CXCR5+ CD4+ T cell population. n=34 (H5N1+AS03) and 16 (H5N1) participants. Orange/green p values represent post-vaccination changes within each group (two-sided Wilcoxon test), gray p values represent between group comparisons (two-sided Mann-Whitney test). (c) Correlation of the day 28/21 fold change in activated Tfh cell frequencies with the day 42/21 fold increase in MN titers. The Pearson correlation coefficient and p value are reported. (d) Average log2 fold change of genes in activated (PD-1+ICOS+) versus non-activated (PD-1- ICOS-) Tfh1 (x-axis) and Tfh2 (y-axis) cells. The top 20 genes with the greatest average absolute fold change are annotated in red. (e) Boxplot of estimated frequency of monocytes in non-activated and activated Tfh based on digital cytometry of transcriptional profiles using CIBERSORT. Lines represent means, shaded area represents 95% confidence interval, and lines represent standard deviation. n=27 (unactivated) and 28 (activated), unpaired two-sided t-test. (f) BTMs significantly enriched (FDR<0.05) in activated versus non-activated Tfh cells. CIBERSORTx was used to estimate CD4 T cell specific expression in sorted Tfh transcriptional profiles, and then GSEA was used to identify enriched BTMs using genes ranked by their fold change between activated and non-activated Tfh. See Methods section for further details. (g) Genes in BTM M219; each ‘edge’’ (gray line) represents a coexpression relationship; colors represent the fold change in activated versus non-activated Tfh. (h) Genes in BTM M4.2; each ‘edge’’ (gray line) represents a coexpression relationship; colors represent the fold change in activated versus non-activated Tfh. (i) Clustered heatmap of the top 40 genes by fold change between activated and non-activated Tfh. Colors represent row-wise z-scores. *, P < 0.05; **, P < 0.01; ***, P < 0.001; ****, P < 0.0001.
Extended Data Fig. 3 Relationship between peak and durable antibody responses.
(a) Kinetics of HAI titers in response to H5N1+AS03 and IIV vaccination. Lines represent the geometric mean, and shaded areas represent the geometric standard deviation. IIV titers are from young adults (<65 years old) vaccinated with the 2010 and 2011 seasonal influenza vaccine (Nakaya et al.13). n=34 (H5N1+AS03) and 42 (IIV). (b) Scatterplot of the day 100 and day 42 HAI titers. The day 100/42 HAI residual is defined here as the vertical distance between a given point and the regression line, with the regression line representing the average day 100 titer expected given a particular day 42 response. Participants above/below the regression line are considered ‘persistent’ and ‘temporary’ responders, respectively. The Pearson correlation coefficient and p value are reported. (c) Heatmap of the Pearson correlation coefficients between expression of plasma cell and cell cycle BTMs and peak antibody titers (prime - day 21, boost - day 42) in adjuvanted participants. (d) Scatterplot of the day 28/day 21 mean log2 FC of M156.0 (x axis) versus the day100/day42 HAI residual in adjuvanted participants. The Pearson correlation coefficient and p value are reported.
Extended Data Fig. 4 Platelet-associated signatures of antibody response durability in a NHP vaccination model.
(a) Study design for AS03-adjuvanted COVID-19 vaccination in NHPs. (b) Kinetics of pseudotyped lentivirus neutralization antibody titers following vaccination in NHPs. (c) Bar plot of BTMs associated with antibody persistence on day 7 post-boost in the NHP COVID-19 vaccine study. GSEA was performed on genes ranked by correlation of their day 7 post-boost expression with the day 180/42 antibody residual. Modules shown are those with FDR < 0.05, NES ≥ 2, platelet-associated modules are highlighted in red.
Extended Data Fig. 5 CITEseq quality control data.
(a) Per-cluster cell proportions from day 21 and 28 samples before QC filtering. (b) Per-cluster cell proportions from each subject before QC filtering. (c) Scatterplots of day 28/21 FCs among day 28 DEGs via microarray (x axis) and pseudobulk estimates via CITEseq (y axis) for each subject. The Pearson correlation coefficient and p value are reported. (d) CITE-seq antibody abundance in each cell before QC filtering. (e) DEGs in each cluster compared to all other clusters before QC filtering. (f) Per-cell total reads and number of detected transcripts by cluster before QC filtering.
Extended Data Fig. 6 Effect of TPO administration on the bone marrow compartment.
(a) Study design for TPO administration in mice. Recombinant mouse TPO was injected intraperitoneally at 12.5 μg/kg daily for 5 days. Bone marrow cells were analyzed by flow cytometry on days 4, 7 and 11 following the initial TPO injection. (b-d) Flow cytometry gating strategy (b), megakaryocytes frequency in bone marrow live cells (c), and megakaryocytes ploidy stages (d) after TPO injection were analyzed. n = 6-15, Dunnett’s multiple comparisons test for panel C, unpaired t test for panel D. (e-f) Flow cytometry gating strategy and frequencies of bone marrow immune cell populations. n = 6-15, Dunnett’s multiple comparisons test. (g-h) Flow cytometry gating strategy and frequencies of bone marrow stem and progenitor cells. n = 6-15, Dunnett’s multiple comparisons test. *, P < 0.05; **, P < 0.01; ***, P < 0.001; ****, P < 0.0001.
Extended Data Fig. 7 Analysis of platelet-associated durability signature across vaccines and cell types.
(a) Scatterplots of Day 7 vs Day 0 log2 fold changes (relative to last vaccination) of BTM M85 versus antibody residual in each vaccine dataset. Pearson correlation coefficient and p values are reported. (b) Heatmap of expression of platelet-associated BTMs across cell clusters in the CITE-seq data (Fig. 4). Colors represent row-wise z-scores of average expression of all genes in each module. (c) Scatterplots of Day 7 vs Day 0 log2 fold changes of platelet-expressed BTMs from PBMC (x-axis) and Paxgene (y-axis) samples in a cohort of healthy adults vaccinated with seasonal influenza vaccine. Pearson correlation coefficients and p values are reported.
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Antibody and primer lists.
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Cortese, M., Hagan, T., Rouphael, N. et al. System vaccinology analysis of predictors and mechanisms of antibody response durability to multiple vaccines in humans. Nat Immunol 26, 116–130 (2025). https://doi.org/10.1038/s41590-024-02036-z
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DOI: https://doi.org/10.1038/s41590-024-02036-z
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