'Entopy': local allergy paradigm

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
D G PoweN S Jones

Abstract

Allergy is defined as an immediate hypersensitivity type I immunological disease, which can be IgE or non-IgE driven, and in the latter case may be antibody or cell mediated. Atopy is a term used to describe individuals with a genetic predisposition for developing IgE-mediated allergic disease. But more recently, it has become evident that IgE-mediated disease can occur in non-atopic subjects. While it is now generally accepted that mucosal local IgE has a role in the expression of atopic allergic disease, the concept of 'local allergy' in non-atopic subjects has been proposed, with the term 'entopy' given to this condition. Although there is increasing evidence supporting this paradigm, entopy is only applicable to a proportion of non-atopic patients, suggesting that other disease mechanisms exist to explain non-atopic disease. This review considers the evidence for local mucosal allergy in atopic and non-atopic individuals with an emphasis on diseases affecting the upper airways and eye. Furthermore, the diagnosis, treatment and relationship between local allergy and conventional (systemic) allergy are discussed, and alternative disease mechanisms predominantly involving antibodies or their sub-components (free light chain Ig...Continue Reading

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