Allergy vaccines--new approaches to an old concept

Expert Opinion on Biological Therapy
Alan W Wheeler, Stefan R Woroniecki

Abstract

Allergy vaccination (AV) consists of injecting increasing amounts of offending allergens into sensitive patients with the intention of reducing their level of sensitivity to allergens. This form of therapy was first used over one hundred years ago and until recently had not changed in principle. The vaccines themselves are now far better characterised and standardised, according to new regulatory requirements. The therapy is believed to exert its effects by a combination of means: by the induction of blocking antibodies; a switch from a T helper (Th)2 to a more Th1 allergen-specific immune response; and induction of anergy, probably via the development of allergen-specific regulatory T cells. New allergen forms and formulations are being designed with these targets in mind. Allergoids (allergens chemically modified to reduce allergenicity, but to retain immunogenicity) are becoming employed more frequently. More modern depot forms, such as those containing tyrosine or calcium phosphate, are replacing aqueous extracts and older depot adjuvants such as alum. T cell-reactive peptides and recombinant allergens or their muteins are also being studied as replacements for whole extracts and have shown some potential. Immunomodulators,...Continue Reading

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