Specific immunotherapy and other immunomodulatory strategies have long been a stronghold in the management of allergic diseases. In particular, ''immunodeviation-therapy'' or ''vaccination for allergies'', i.e. the redirection of Th2-type immune responses towards a Th1-response pattern, has become an ever more popular concept. The present feature of CONTROVERSIES complements our previous discussion of atopy (Röcken et al., Exp Dermatol 7: 97-104, 1998), and is dedicated to a critical analysis of the general problems and limitations one faces
Viewpoint 1This Viewpoint essay will focus on discussing the validity of several established or currently explored therapies for atopic dermatitis (AD) in the light of our current understanding of the role for T cells in the development of skin lesions of AD.The mechanism underlying atopic dermatitis (AD) involves complex interactions between various cells and cytokines. Cell-mediated responses are performed by T cells, Langerhans cells, mast cells, eosinophils, and monocytes/macrophages. In initial allergic reactions, the majority of pathogenetic T cells are T helper type 2 (Th2) cells producing interleukin (IL)-4, IL-5, and IL-13 but not IFN-g or IL-2. These cytokines regulate IgE synthesis, promote eosinophil differentiation and survival, and induce vascular endothelial adhesion 128 with the main immunomodulatory strategies traditionally considered in this context. We also explore alternative approaches that appear promising in order to achieve both a more effective and/or a more specific immunotherapy of allergic diseases. Given that the mast cell remains a key protagonist in the pathogenesis of allergic diseases finally, this feature examines how innovative, more selectively mast celltargeted strategies may be developed for the management of allergic diseases.