Aström K, Magnusson CG, Papatziamos G, Hemlin C, Scheynius A, van der Ploeg I. Analysis of epsilon germline transcripts and IL-4 mRNA expression in the adenoids suggests local IgE switching.
Allergy 2000;
55:1049-55. [PMID:
11097315 DOI:
10.1034/j.1398-9995.2000.00703.x]
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Abstract
BACKGROUND
We have previously observed more frequent occurrence of IgE+ and FcepsilonRI+ cells in adenoids of atopic than nonatopic children. To investigate the hypothesis that the adenoids are involved in IgE production, we analyzed the levels of epsilon germline (epsilonGL), IL-4, and IFN-gamma transcripts in the adenoids in relation to atopy and presence of ear disease.
METHODS
Adenoidectomy was performed on 19 atopic and 18 nonatopic children (median age 5 years, range 2-12 years) suffering from otitis media with effusion (OME) (n = 16) or obstructive adenoids hyperplasia (AH) (n = 21). The levels of epsilonGL transcripts, IL-4, and IFN-gamma mRNA were analyzed by competitive reverse transcriptase-PCR.
RESULTS
EpsilonGL transcript levels in the adenoids were found to be dependent on IL-4 mRNA expression (P < 0.01) and serum IgE levels (P < 0.05) (R2 = 0.32, n = 37). IL-4 mRNA expression was associated with epsilonGL transcript levels (rs = 0.32, P = 0.05, n = 37), especially among patients with AH (rs = 0.53, P = 0.01, n = 21). No significant differences in IL-4 and IFN-gamma mRNA levels were observed between the groups.
CONCLUSIONS
This study supports an IL-4-induced class switch to IgE production in the adenoids that might be of importance for inflammatory reactions in the upper respiratory tract.
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