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Int Arch Allergy Immunol. 2009;150(4):370-6. doi: 10.1159/000226238. Epub 2009 Jul 1.

Three-year follow-up study of allergen-induced in vitro cytokine and signalling lymphocytic activation molecule mRNA responses in peripheral blood mononuclear cells of allergic rhinitis patients undergoing specific immunotherapy.

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  • 1Department of Pulmonary Diseases and Clinical Allergology, University of Turku, FI-20520 Turku, Finland.

Abstract

BACKGROUND:

Allergen-specific immunotherapy (SIT) is known to affect the allergen-specific T helper cell (Th2/Th1) balance and to induce T regulatory (Treg) cells. These observations have usually been made during the first treatment year and often without symptom monitoring. This study was performed to investigate allergen-induced Th2 (IL-4, IL-5)-, Th1 [IFN-gamma, IL-18, signalling lymphocytic activation molecule (SLAM)]- and Treg (IL-10)-type immune responses in peripheral blood mononuclear cells (PBMC) and their association with symptom improvement in allergic rhinitis patients after 3 years of SIT.

METHODS:

Twenty patients were treated with SIT and 8 patients were studied as untreated controls. PBMC were collected before and after 1 and 3 years of SIT and stimulated with specific allergen. Cytokine and SLAM mRNA expression was determined by TaqMan(R) RT-PCR. Symptoms were recorded yearly using visual analogue scale (VAS) scoring.

RESULTS:

IL-18, SLAM and IL-10 mRNA expression increased after 3 years of SIT, with a peak at 1 year, whereas IL-5 mRNA expression transiently decreased and IFN-gamma mRNA expression transiently increased after 1 year of SIT. The increases in IL-18 and SLAM expression were not associated with symptom improvement, whereas decreases in both IL-4 expression and the IL-4/IFN-gamma ratio after 1 year of SIT were found in patients with a good therapeutic outcome (>40 percentage unit reduction in VAS).

CONCLUSIONS:

SIT has long-term effects on allergen-specific immune responses. The induced Treg- and Th1-type responses persist over 3 years of SIT, whereas Th2-type responses are transiently decreased only during early therapy.

Copyright 2009 S. Karger AG, Basel.

[PubMed - indexed for MEDLINE]
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