Analysis of antigenic determinants shared by two different allergens recognized by human T cells: house dust mite (Dermatophagoides pteronyssinus) and chironomid midge (Chironomus yoshimatsui).
To analyse the cross-reactivity of T-cell-mediated immunity between Dermatophagoides pteronyssinus (Dp) and Chironomus yoshimatsui (Cy), the most common allergens in Japan, we established antigen-specific human T-cell lines and clones. Some but not all of the Cy-induced T-cell lines showed a significant proliferative response not only to Cy, but also to Dp. No T-cell line responded to other unrelated antigens. When we stimulated the Dp-induced T-cell clones with Cy, 3 of the 40 clones (7.5%) showed a significant proliferation, and 2 of the 3 clones produced interleukin-4 and interferon-gamma, indicating their helper function. Cross-reactivity was diminished significantly after the absorption of Dp antigen in an anti-Cy affinity column. The cross-reactive epitopes were thought to be expressed on the Dp molecule of 45-53 kD. The presence of helper T cells reactive to both allergens suggests a possibility that this cross-reactivity might be involved in part in the high incidence of allergy to the 2 major allergens.
D000485:Allergens / Q000032:analysis* / Q000276:immunology*; D000818:Animals; D039741:Antigens, Dermatophagoides; D002683:Chironomidae / Q000276:immunology*; D002999:Clone Cells / Q000276:immunology; D003429:Cross Reactions; D000939:Epitopes / Q000032:analysis*; D006801:Humans; D006967:Hypersensitivity / Q000276:immunology; D007111:Immunity, Cellular; D007963:Leukocytes, Mononuclear / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
D000485:Allergens; D039741:Antigens, Dermatophagoides; D000939:Epitopes