Human memory CD4+ T cell response to the major dog allergen Can f 5, prostatic kallikrein.

Abstract

BACKGROUND Human CD4+ T cell responses to important animal allergens are still insufficiently understood. OBJECTIVE To comprehensively characterize in vitro and ex vivo the peripheral blood memory CD4+ T cell responses of subjects with and without allergy to the major dog allergen Can f 5, the only known animal allergen in the kallikrein family of proteins. METHODS Can f 5-specific memory CD4+ T cell lines (TCLs) were established from the peripheral blood of 12 subjects with and 12 subjects without allergy to Can f 5 and characterized for their functional and phenotypic properties. The results were evaluated with those obtained ex vivo with a novel CD154 enrichment method. The epitopes recognized by the Can f 5-specific TCLs were determined with 72 overlapping 16-mer peptides covering the sequence of the allergen. RESULTS Can f 5-specific TCLs were obtained at about tenfold higher frequency from allergic than from non-allergic subjects. Functionally, the TCLs of allergic subjects displayed a Th2-biased cytokine phenotype and increased T cell receptor avidity, whereas the TCLs of non-allergic subjects displayed a Th1-/Th0-biased cytokine phenotype and lower TCR avidity. The higher frequency and the Th2 phenotype of Can f 5-specific memory CD4+ T cells in allergic subjects were confirmed by the CD154 enrichment method ex vivo. Six distinct T cell epitope regions of Can f 5 were predominantly recognized by the TCLs from allergic subjects. CONCLUSIONS AND CLINICAL RELEVANCE Can f 5-specific memory CD4+ T cell responses differ considerably between subjects with and without allergy, as assessed by both in vitro and ex vivo approaches. Peptides containing the dominant T cell epitopes of Can f 5 can be employed for developing peptide-based immunotherapy for dog allergy.

DOI: 10.1111/cea.12694

Cite this paper

@article{Kailaanmki2016HumanMC, title={Human memory CD4+ T cell response to the major dog allergen Can f 5, prostatic kallikrein.}, author={Anssi H. T. Kailaanm{\"a}ki and Tuure T. Kinnunen and Antti R{\"{o}nk{\"a} and M Rytk{\"{o}nen-Nissinen and Jonas {\AA}. Lidholm and L A Mattsson and J. Randell and Tuomas I. Virtanen}, journal={Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology}, year={2016}, volume={46 5}, pages={720-9} }