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Journal of Allergy
Volume 2010 (2010), Article ID 519298, 14 pages
http://dx.doi.org/10.1155/2010/519298
Review Article

The Other T Helper Cells in Asthma Pathogenesis

1Department of Experimental Pneumology, Research Center Borstel, 23845 Borstel, Germany
2Medical Clinic, Research Center Borstel, 23845 Borstel, Germany

Received 10 March 2010; Accepted 18 June 2010

Academic Editor: Kurt Blaser

Copyright © 2010 Christina Vock et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The complex phenotype of allergic bronchial asthma involves a variable degree of bronchoobstruction, increased mucus production, and airway remodeling. So far it is suggested that it arises from multiple interactions of infiltrating and structural cells in the context of chronic airway inflammation that is orchestrated by T helper 2 (TH2) cells. By secreting a plethora of typical mediators such as interleukin (IL) 4, IL-5, and IL-13, these cells hold a key position in asthma pathogenesis. However, therapeutic approaches targeting these TH2-type mediators failed to improve asthma symptoms and impressively showed that asthma pathogenesis cannot be reduced by TH2 cell functions. Recently, other T helper cells, that is, TH9 and TH17 cells, have been identified and these cells also contribute to asthma pathogenesis, the processes leading to formation or aggravation of asthma. Furthermore, TH25 cells, TH3 cells, and regulatory T cells have also been implicated in asthma pathogenesis. This paper aims at summarizing recent insights about these new T helper cells in asthma pathogenesis.