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¹ Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, UK
² Centre for Inflammation Research, University of Edinburgh, Edinburgh, EH9 3JT, UK

CORRESPONDENCE Rick M Maizels: rick.maizels{at}ed.ac.uk

Allergic diseases mediated by T helper type (Th) 2 cell immune responses are rising dramatically in most developed countries. Exaggerated Th2 cell reactivity could result, for example, from diminished exposure to Th1 cell–inducing microbial infections. Epidemiological studies, however, indicate that Th2 cell–stimulating helminth parasites may also counteract allergies, possibly by generating regulatory T cells which suppress both Th1 and Th2 arms of immunity. We therefore tested the ability of the Th2 cell–inducing gastrointestinal nematode Heligmosomoides polygyrus to influence experimentally induced airway allergy to ovalbumin and the house dust mite allergen Der p 1. Inflammatory cell infiltrates in the lung were suppressed in infected mice compared with uninfected controls. Suppression was reversed in mice treated with antibodies to CD25. Most notably, suppression was transferable with mesenteric lymph node cells (MLNC) from infected animals to uninfected sensitized mice, demonstrating that the effector phase was targeted. MLNC from infected animals contained elevated numbers of CD4⁺CD25⁺Foxp3⁺ T cells, higher TGF-ß expression, and produced strong interleukin (IL)-10 responses to parasite antigen. However, MLNC from IL-10–deficient animals transferred suppression to sensitized hosts, indicating that IL-10 is not the primary modulator of the allergic response. Suppression was associated with CD4⁺ T cells from MLNC, with the CD4⁺CD25⁺ marker defining the most active population. These data support the contention that helminth infections elicit a regulatory T cell population able to down-regulate allergen induced lung pathology in vivo.

J.R. Lamb's present address is Translational Medicine and Genetics, Clinical Pharmacology and Discovery Medicine, GlaxoSmithKline, Greenford UB6 0HE, UK.

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