Measurement of allergen-specific IgD and correlation with allergen-specific IgE.
A new method for the measurement of allergen-specific IgD (as-IgD) was developed by modifying the ImmunoCAP assay (Pharmacia), and amplification of the signal with a goat anti-human/rabbit anti-goat detection system. The assay was sensitive enough to measure as-IgD in serum samples. The specificity of the assay was examined using inhibition tests with excess corresponding and non-corresponding allergens. For the different allergens inhibition rates between 56% (house dust mite) and 88% (cat) could be achieved. Non-corresponding allergens did not inhibit the as-IgD binding. Total IgE and allergen-specific IgE (as-IgE) was measured using the ImmunoCAP system. Total IgD was measured using a sandwich ELISA. As-IgD was measured in serum samples from 51 atopic and 23 non-atopic subjects, and the correlation with as-IgE was examined. As-IgD was detected in both atopics and non-atopics but at higher levels in atopics. As-IgD against birch pollen and timothy pollen allergen was found to be increased in atopics with IgE directed against these allergens compared to atopics without IgE against these allergens (P < 0.02 and P < 0.03). As-IgD against birch pollen allergen was higher in atopics with IgE specific to this allergen than in non-atopics (P < 0.02). In contrast to total IgE and total IgD, significant correlations were observed between as-IgD and as-IgE against timothy pollen (r = 0.34, P < 0.04), birch pollen (r = 0.38, P < 0.05) and cat dander allergen (r = 0.52, P < 0.01). The observed correlations between as-IgD and IgE suggest that IgD and IgE may be similarly regulated, and thus the measurement of as-IgD may give further insight into the regulation of IgE.
Zhang
M
M
Department of Clinical Immunology and Asthma-OPD, Free University Berlin, Germany.
Niehus
J
J
Brunnée
T
T
Kleine-Tebbe
J
J
O'Connor
A
A
Kunkel
G
G
D000293:Adolescent; D000328:Adult; D000485:Allergens / Q000276:immunology*; D000918:Antibody Specificity / Q000276:immunology; D001667:Binding, Competitive / Q000276:immunology; D005260:Female; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000276:immunology; D007118:Immunoassay / Q000379:methods; D007072:Immunoglobulin D / Q000097:blood / Q000276:immunology*; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology*; D008297:Male; D008875:Middle Aged
D000485:Allergens; D007072:Immunoglobulin D; D007073:Immunoglobulin E