Novel birch pollen specific immunotherapy formulation based on contiguous overlapping peptides

Area of Science:

• Immunology
• Allergen immunotherapy

Background:

• Synthetic contiguous overlapping peptides (COPs) offer a novel approach for allergen-specific immunotherapy.
• COPs encompass the entire allergen sequence, targeting T cell epitopes while avoiding IgE-binding conformational epitopes.

Purpose of the Study:

• To evaluate the hypoallergenicity and in vivo reactivity of synthetic contiguous overlapping peptides (COPs) derived from Bet v 1.
• To assess the potential of COPs as a safer alternative to traditional allergen immunotherapy methods.

Main Methods:

• COPs were designed based on Bet v 1 sequence and crystal structure to minimize IgE binding.
• In vitro assays (ELISA, basophil degranulation) and in vivo studies (mouse model, human skin prick tests) were conducted.

Main Results:

• A specific COP combination (AllerT) showed no anaphylaxis induction in sensitized mice and no positive skin prick tests in allergic volunteers.
• Another COP set (AllerT4-T5) exhibited minimal IgE binding and subliminal skin reactivity.

Conclusions:

• The hypoallergenicity of COPs was confirmed through low IgE binding, absent basophil activation, and lack of in vivo allergic reactions.
• COPs represent a potentially safer alternative for allergen immunotherapy.