Luise Westernberg, PhD, Véronique Schulten, PhD, Jason A

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Presentation transcript:

T-cell epitope conservation across allergen species is a major determinant of immunogenicity Luise Westernberg, PhD, Véronique Schulten, PhD, Jason A. Greenbaum, PhD, Sara Natali, Victoria Tripple, BS, Denise M. McKinney, April Frazier, PhD, Heidi Hofer, PhD, Michael Wallner, PhD, Federica Sallusto, PhD, Alessandro Sette, PhD, Bjoern Peters, PhD Journal of Allergy and Clinical Immunology Volume 138, Issue 2, Pages 571-578.e7 (August 2016) DOI: 10.1016/j.jaci.2015.11.034 Copyright © 2016 The Authors Terms and Conditions

Fig 1 Conservation of timothy grass proteins across other pollens. A, Six hundred forty-eight peptides from IgE-reactive P pratense allergens listed by IUIS were examined for their conservation in other pollen species. A peptides was considered conserved in another pollen if its transcriptome encoded the peptide or a variant with up to 2 amino acid substitutions. The percentage of peptides conserved in all 4 additional grass transcriptomes (pangrass) is indicated by light gray columns, and the percentage of peptides conserved in all 10 pollens (panpollen) is indicated by dark gray columns. Antigens are sorted based on pangrass conservation from low to high. B and C, The pangrass (Fig 1, B) and panpollen (Fig 1, C) conservation of IUIS allergens was then compared with that of proteins identified in P pratense pollen based on a transcriptomic and proteomic analysis. Medians and quantile ranges are indicated by boxes and error bars. P pratense pollen proteins that were not recognized by either T-cell or B-cell responses were less conserved than both IUIS allergens and TGTAs. Asterisks indicate statistically significant differences: P < .05, 1-tailed Mann-Whitney test. Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig 2 Peptide conservation correlates with immunogenicity. Panels of peptides from timothy grass proteins were previously tested for the ability to induce IL-5 responses in PBMCs from allergic patients after in vitro culture with timothy grass extract in 2 separate cohorts. Peptides from each study were separated into sets based on the number of pollen species in which they were conserved (x-axis). For each set, the average frequency of T-cell responses was calculated and normalized to 1.0 for each study (y-axis). Data for peptides derived from IUIS allergens are shown as blue diamonds, whereas peptides derived from TGTA antigens are shown as red boxes, and averages of the 2 are shown as black circles. The line depicts a linear correlation for the averaged data, which is highly significant with an r2 value of 0.796. Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig 3 Conservation in the transcriptome predicts peptide cross-reactivity. For each peptide, donors with P pratense allergy were selected who reacted to the peptide after expanding PBMCs in vitro with P pratense extract. PBMCs were stimulated with individual peptides for 14 days, and IL-5 responses were measured by using an ELISpot to (1) the peptide itself, (2) P pratense extract, (3) the 9 other extracts for which the transciptomes were sequenced, and (4) peptide pools that did or did not contain the peptide as relevant and irrelevant controls. T-cell cultures that did not induce a robust response of greater than 200 spot-forming cells/million to the peptide itself were excluded (30% of cultures). Reponses to extracts and peptide pools are expressed as the relative fraction of the response to the peptide itself and capped at 100%. Each gray bar represents the average response ± SEM. Asterisks indicate P values of statistical significance, as indicated on the right according to 1-tailed Mann-Whitney tests. Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig 4 T-cell clone cross-reactivity. Donor 1583 was cultured with peptide P5 and then restimulated with that same (relevant) peptide, an irrelevant peptide control, and peptides from the 4 grasses (green), 4 trees (blue), and 2 weeds (red). A, ELISpot data from the P5 cultured cell line. B-E, Proliferation of 4 representative T-cell clones derived from the same patient. SI was calculated by dividing cpm of antigen stimulated wells with cpm of unstimulated wells. Conditions with SI>2 were considered positive (∗). Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig 5 Schematic representation of allergen cross-reactive versus monospecific T-cell epitope recognition. Allergens 1 and 2 contain a conserved T-cell epitope. Therefore cross-reactive T cells that respond to this epitope will be primed more frequently (cross-reactive T-cell in red, top) than T cells that are specific for an epitope unique to a single allergen (allergen monospecific T cell in blue, bottom). Consequently, cross-reactive T cells can provide T-cell help to B cells that are specific to different allergens and promote antibody production/isotype switching to IgE. Importantly, both B cells that produce cross-reactive IgE and B cells that produce monospecific IgE can receive help from cross-reactive T cells as long as they process and present a conserved T-cell epitope. APC, Antigen-presenting cells. Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig E1 Conservation of peptides in different timothy grass pollen proteins. A, Conservation of the 13 TGTAs. B, Conservation of timothy grass pollen proteins that were unreactive based on both T-cell and B-cell responses. Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig E2 Cytokine release by T cells after 2 weeks of peptide culture. Shown are IFN-γ and IL-5 release by T cells restimulated either with the peptide with which they were originally cultured or restimulated with a relevant peptide pool or an irrelevant peptide pool or timothy grass extract. Each bar represents the average spot-forming cells/million (SFC) ± SEM. Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig E3 Separate analysis of correlation between cross-reactivity and conservation for IUIS allergen peptides and TGTA peptides. The analysis performed is the same as in Fig 3 but splits out peptides from known IUIS allergens versus TGTA proteins. *P < .05, **P < .01, ***P < .005, and ****P < .001. n.s., Not significant. Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions

Fig E4 A, Additional T-cell clones generated from the same culture (with P pratense peptide P5) as shown in Fig 4. B, ELISpot data from the cell line (top) and proliferation from individual T-cell clones (bottom) derived from another culture with P pratense peptide P7. SI was calculated by dividing cpm of antigen stimulated wells with cpm of unstimulated wells. Conditions with SI>2 were considered positive (∗). Journal of Allergy and Clinical Immunology 2016 138, 571-578.e7DOI: (10.1016/j.jaci.2015.11.034) Copyright © 2016 The Authors Terms and Conditions