An Ecoliexpressed, recombinant hypoallergenic hybrid molecule derived from the major timothy grass pollen allergens Phl p 2 and Phl p 6 (hP62) served as control antigen

An Ecoliexpressed, recombinant hypoallergenic hybrid molecule derived from the major timothy grass pollen allergens Phl p 2 and Phl p 6 (hP62) served as control antigen.24Synthetic peptides spanning the Cyp c 1.01 sequence (TableS1) were produced by solid phase peptide chemistry, purified to homogeneity, and characterized by mass spectrometry as described.19 == Figure 1. epitope. However, mCyp c 1 was more sensitive to enzymatic digestionin vitrothan nCyp c 1. A single highdose oral administration of nCyp c 1 but not of mCyp c 1 induced longterm oral tolerance, characterized by lack of parvalbuminspecific antibody and cellular responses. Moreover, mCyp c 1fed mice, but not nCyp c 1fed mice developed allergic symptoms upon challenge with nCyp c 1. == Conclusion == Sensitivity to digestion in the gastrointestinal tract influences the capacity of an allergen to induce prophylactic oral tolerance. Keywords:allergen, allergy, food allergy, oral tolerance induction, parvalbumin The calciumbinding protein parvalbumin, a major and crossreactive allergen for fish allergic patients, induces robust and longlasting immunological and clinical oral tolerance in a murine model of fish allergy. A recombinant parvalbumin mutant, that resembled the wildtype parvalbumin regarding biochemical and immunological properties, but was more sensitive toin vitrodigestion, failed to induce oral tolerance. Level of sensitivity to digestion in the gastrointestinal tract influences the capacity of an allergen to induce prophylactic oral Hoechst 33342 analog tolerance. == Abbreviations == allergenspecific immunotherapy counts per minute intragastric kilo Dalton recombinant mutant Cyp c 1 molecular excess weight natural Cyp c 1 optical denseness oral immunotherapy rat basophil leukemia recombinant wildtype Cyp c 1.01 subcutaneous allergenspecific immunotherapy temperature betamercaptoethanol == 1. Intro == Food allergy represents one of the important medical manifestations Mouse monoclonal to PPP1A of IgEassociated allergy. It often starts in early child years and can induce severe and lifethreatening anaphylaxis. Potent allergen sources are peanuts, tree nuts, cow’s milk, egg, soy, wheat, shellfish, and fish.1,2Diagnosis of the diseasecausing food allergens is extremely important because it guides allergenspecific forms of treatment, such as avoidance, diet, intro of hypoallergenic formulas, and allergenspecific immunotherapy often performed from the dental route (ie, dental allergenspecific immunotherapy, OIT).3,4,5In addition, several clinical studies indicate that early introduction of allergencontaining food into the diet of sensitized but not yet allergic children may prevent the development of food allergy.6,7The development of early allergenspecific forms for the prevention of allergy such as oral tolerance induction and/or early allergenspecific immunotherapy (AIT) has become an important topic because it may prevent allergic sensitization, the transition from silent sensitization to symptomatic allergy and the progression from slight to severe forms of allergy especially early in childhood.8,9,10,11Fish represents probably one of the most important food allergen sources which can induce severe anaphylactic reactions.12The calciumbinding protein parvalbumin has been identified as the major and crossreactive allergen in different fish species and is available as recombinant allergen to identify individuals with specific IgE sensitization.13We have developed a recombinant mutant of carp parvalbumin, Hoechst 33342 analog mCyp c 1, which differs from your wildtype allergen only in four amino acids but shows strongly reduced allergenic activity.14,15mCyp c 1 has been utilized for subcutaneous AIT (SCIT) and induced allergenspecific blocking antibodies (Clinicaltrials.gov identifier:NCT02017626andNCT02382718).16,17,18Using a mouse model for fish allergy, we have recently shown the passive administration of mCyp c 1specific IgG antibodies reduced symptoms of fish allergy19similar as offers been shown inside a clinical trial for Fel d 1specific IgG antibodies in kitten allergic patients.20Passive immunization with Bet v 1, Phl p 1, and Phl p 5specific IgG antibodies prevented the development of pollen allergy but the duration of the effect has not been investigated.21 In this study, we used wildtype Cyp c 1 and mCyp c 1 to investigate if early oral administration of the antigens can induce robust and longlasting immunological and clinical tolerance in the murine model of fish allergy. In particular, we were interested to study Hoechst 33342 analog if level of sensitivity to digestion of the tolerogens may impact the outcome of tolerance induction. == 2. MATERIALS AND METHODS == == 2.1. Natural and recombinant antigens, synthetic peptides == Carp draw out was prepared from homogenized carp muscle tissue by extraction in.