Different Bla-g T cell antigens dominate responses in asthma versus rhinitis subjects

M. B.C. Dillon, V. Schulten, C. Oseroff, S. Paul, L. M. Dullanty, A. Frazier, X. Belles, M. D. Piulachs, C. Visness, L. Bacharier, G. R. Bloomberg, P. Busse, J. Sidney, B. Peters, A. Sette

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Background and objective: The allergenicity of several German cockroach (Bla-g) antigens at the level of IgE responses is well established. However, less is known about the specificity of CD4+ TH responses, and whether differences exist in associated magnitude or cytokine profiles as a function of disease severity. Methods: Proteomic and transcriptomic techniques were used to identify novel antigens recognized by allergen-specific T cells. To characterize different TH functionalities of allergen-specific T cells, ELISPOT assays with sets of overlapping peptides covering the sequences of known allergens and novel antigens were employed to measure release of IL-5, IFNγ, IL-10, IL-17 and IL-21. Results: Using these techniques, we characterized TH responses in a cohort of adult Bla-g-sensitized subjects, either with (n = 55) or without (n = 17) asthma, and nonsensitized controls (n = 20). T cell responses were detected for ten known Bla-g allergens and an additional ten novel Bla-g antigens, representing in total a 5-fold increase in the number of antigens demonstrated to be targeted by allergen-specific T cells. Responses of sensitized individuals regardless of asthma status were predominantly TH2, but higher in patients with diagnosed asthma. In asthmatic subjects, Bla-g 5, 9 and 11 were immunodominant, while, in contrast, nonasthmatic-sensitized subjects responded mostly to Bla-g 5 and 4 and the novel antigen NBGA5. Conclusions: Asthmatic and nonasthmatic cockroach-sensitized individuals exhibit similar TH2-polarized responses. Compared with nonasthmatics, however, asthmatic individuals have responses of higher magnitude and different allergen specificity.

Original languageEnglish
Pages (from-to)1856-1867
Number of pages12
JournalClinical and Experimental Allergy
Volume45
Issue number12
DOIs
StatePublished - Dec 2015

Keywords

  • Asthma
  • CD4 T cell
  • Cockroach allergy
  • Epitope

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