Incorporation of T-cell epitopes from tetanus and diphtheria toxoids into in-silico-designed hypoallergenic vaccine may enhance the protective immune response against allergens
Objective(s): New generation of allergy vaccines is capable of promoting the development of protective IgG and blocking the functionality of allergen-specific IgE. We incorporated universal and powerful T-cell epitopes from tetanus and diphtheria toxoids (TD epitope) into recombinant Che a 2, the well-known allergic profilin of Chenopodium album, to determine its immunological properties.Materials and Methods: The sequence and accordingly the structure of the recombinant Che a 2 was altered to generate a hypoallergenic variant (rChe a 2.rs). Moreover, TD epitope was incorporated to produce a novel vaccine that was nominated as rChe a 2.rsT.D. The effect of treatment with these variants was evaluated on the generation of allergen-specific IgG class, as well as lymphocyte proliferation in mice. Moreover, IgE-binding characteristics of the allergic patients’ sera were determined by ELISA and proliferation and cytokine production was measured in T-cells. Results: ELISA and dot blot revealed strong reduction of the IgE-reactivity of human sera to the variants of Che a 2 as compared to the wild-type molecule. Furthermore, Che a 2.rs and Che a 2.rsT.D induced much lower levels of IL5 and IL13 secretion from allergic patients’ PBMCs in comparison to wild-type Che a 2 protein. In mice, rChe a 2.rsT.D induced high titers of Che a 2-specific IgG antibody capable of blocking IgE-binding to rChe a 2 and induced lymphocyte proliferation more potently than rChe a 2.rs. Conclusion: Collectively, incorporation of T-cell epitopes of tetanus and diphtheria into hypoallergenic vaccines can dramatically enhance anti-allergic immune mechanisms, particularly in poor responders.
The immunogenicity of ten different formulations of intranasal diphtheria and tetanus vaccines which containing different absorption enhancers, adjuvants and other excipients were determined in guinea pigs by the serum neutralization (SN) method. From these ten formulations, it was selected four formulations which gave significant immunogenicity in guinea pigs. In order to design the "final f...متن کامل
DESCRIPTION DAPTACEL, Diphtheria and Tetanus Toxoids and Acellular Pertussis Vaccine Adsorbed, for intramuscular use, manufactured by Aventis Pasteur Limited, is a sterile suspension of pertussis antigens and diphtheria and tetanus toxoids adsorbed on aluminum phosphate in a sterile isotonic sodium chloride solution. After shaking, the vaccine is a white homogeneous cloudy suspension. Each dose...متن کامل
DESCRIPTION DAPTACELTM, Diphtheria and Tetanus Toxoids and Acellular Pertussis Vaccine Adsorbed, for intramuscular use, manufactured by Aventis Pasteur Limited, is a sterile suspension of pertussis antigens and diphtheria and tetanus toxoids adsorbed on aluminum phosphate in a sterile isotonic sodium chloride solution. After shaking, the vaccine is a white homogeneous cloudy suspension. Each do...متن کامل
DESCRIPTION Tripedia , Diphtheria and Tetanus Toxoids and Acellular Pertussis Vaccine Adsorbed (DTaP), for intramuscular use, is a sterile preparation of diphtheria and tetanus toxoids adsorbed, with acellular pertussis vaccine in an isotonic sodium chloride solution containing thimerosal as a preservative and sodium phosphate to control pH. After shaking, the vaccine is a homogeneous white sus...متن کامل
In Silico Prediction of B-Cell and T-Cell Epitopes of Protective Antigen of Bacillus anthracis in Development of Vaccines Against Anthrax
Protective antigen (PA), a subunit of anthrax toxin from Bacillus anthracis, is known as a dominant component in subunit vaccines in protection against anthrax. In order to avoid the side effects of live attenuated and killed organisms, the use of linear neutralizing epitopes of PA is recommended in order to design recombinant vaccines. The present study is aimed at determining the dominant epi...متن کامل
ذخیره در منابع من
دوره 23 شماره 5
صفحات 636- 644
تاریخ انتشار 2020-05-01
با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.