Immunoprophylaxis with DNA vaccination inhibits Th2-mediated responses and airway inflammation in mice sensitised with the major timothy grass pollen allergen Phl p 5b.

DNA vaccination is discussed as having the potential of improving therapy of type I allergies. A mouse model was used to investigate the effect of DNA vaccination against sensitisation with the clinically relevant Phl p 5b major allergen from timothy grass pollen in an immunoprophylactic experimental setup. Pre-treating the mice with Phl p 5b-DNA-construct significantly inhibited the production of specific IgE and IgG1 antibodies and prevented the development of a lung pathology associated with inflammation. Thus, immunoprophylaxis with an expression vector containing the Phl p 5b sequence totally prevented the emergence of characteristics associated with type I allergy and chronic bronchitis.