Immunoregulation in cutaneous allergy: prevention and controlZielinski, Christina E.; Zuberbier, Torsten; Maurer, MarcusCurrent Opinion in Allergy and Clinical Immunology: October 2012 - Volume 12 - Issue 5 - p 498–503 doi: 10.1097/ACI.0b013e3283574ccb SKIN ALLERGY: Edited by Thomas Werfel and Torsten Zuberbier Abstract Author Information Purpose of review The cutaneous surface is exposed to a myriad of encounters with chemicals, allergens and microbes. Nevertheless, it withstands these environmental assaults without overt inflammation. We will discuss the role of T regulatory cells in a situation where this tissue homeostasis fails – cutaneous allergy, in particular contact hypersensitivity. Recent findings Immune regulation is a complex process that is mediated by many cellular players. T regulatory cells have risen to particular prominence as potent immunosuppressors because their absence results in inflammation including skin allergy. Recent findings revealed that T regulatory cells comprise a heterogeneous group of subpopulations with specialized homing capabilities and suppressor functions. The stability of the T regulatory cell subset in proinflammatory microenvironments is controversially discussed. In addition, it has recently been shown that mechanisms by which T regulatory cells exert their immunosuppressive functions can be adopted by pathogenic effector T cells in certain situations. Summary In cutaneous allergy, immunoregulatory mechanisms are dysfunctional. The cellular players comprise classical T regulatory cells as well as effector T cells with regulatory activities. Understanding their role in skin homeostasis and the mechanisms by which their regulatory functions are abrogated will yield novel therapeutic targets for the treatment of cutaneous allergies. aDepartment of Dermatology and Allergology, Charité-UniversitätsmedizinBerlin bBerlin-Brandenburg School for Regenerative Therapies, Berlin, Germany Correspondence to Dr med. Christina E. Zielinski, Cellular Immunoregulation laboratory, Department of Dermatology and Allergology, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany. Tel: +49 30 450 518 213; e-mail: email@example.com Copyright © 2012 Wolters Kluwer Health, Inc. All rights reserved.