An increased frequency of IgE-producing B cell precursors contributes to the elevated levels of plasma IgE in atopic subjects

• Published in: Clinical and experimental allergy Vol. 25; no. 8; p. 749
• Main Authors: Kasaian, M T, Meyer, C H, Nault, A K, Bond, J F
• Format: Journal Article
• Language: English
• Published: England 01-08-1995
• Subjects: Animals; B-Lymphocytes - immunology; Hematopoietic Stem Cells - immunology; Humans; Hypersensitivity - immunology; Immunoglobulin E - biosynthesis; Immunoglobulin E - blood; Immunoglobulin G - blood; Immunoglobulin M - blood; Mites - immunology
• ISSN: 0954-7894
• DOI: 10.1111/j.1365-2222.1995.tb00013.x

The production of specific IgE, which underlies the allergic response, may be a normal correlate of the immune response to a certain class of antigen (allergens), or could represent a unique response driven by regulatory signals that are absent in non-allergic individuals. If atopic subjects do possess a regulatory environment favoring IgE production, they may display not only allergen-specific IgE, but also higher levels of total IgE and higher frequencies of IgE-producing B lymphocytes.
To address the contribution of antibody-producing cell number to the circulating IgE titre in atopic vs non-atopic subjects.
Frequency determination by limiting dilution of EBV transformants and Poisson distribution analysis. Titres of total and allergen-specific IgM, IgG, and IgE by specific ELISA.
In contrast to findings reported by others, the atopic subjects had a significantly higher frequency of IgE-producing B cells than non-atopics (0.79% of total Ig-producing cells, as compared with 0.17% for the control group; P < 0.01), suggesting that one factor contributing to the high plasma IgE titres in atopic subjects is the high frequency of B lymphocytes with the potential to produce IgE. Although only the atopic subjects produced allergen-specific IgE, the frequency of specific IgE-producing B cells was undetectable in both groups.
Atopic subjects have higher frequencies of IgE-producing B cell precursors than non-atopics. A correlation exists between IgE-producing B cell frequency and levels of circulating IgE.