Combined ε-Toxin Nanovaccine with Enhanced Immunity for Effective Protection in a Murine Model

Area of Science:

• Veterinary immunology
• Vaccine development
• Toxinology

Background:

• Clostridium perfringens ε toxin (ETX) is a Category B biological weapon causing fatal enterotoxemia in livestock.
• Vaccination is a critical strategy for preventing ETX intoxication.

Purpose of the Study:

• To develop and evaluate a novel cell membrane-encapsulated nanoparticle vaccine (MNP-ASP-ETX) for ETX intoxication.
• To assess the biosafety, antigen presentation efficiency, and protective efficacy of the MNP-ASP-ETX vaccine.

Main Methods:

• Preparation of a nanoparticle vaccine (MNP-ASP-ETX) encapsulating a mutant ETX protein and targeting B cells via ASP-ETX.
• In vitro and in vivo experiments to monitor antigen presentation, evaluate biosafety, and assess immune responses (antibody titers, Th1/Th2 responses).
• Comparison with a traditional aluminum-adjuvanted vaccine (ETX^Y196E + Al).

Main Results:

• The MNP-ASP-ETX vaccine exhibited superior biosafety, favorable encapsulation, and optimal particle size for antigen uptake.
• It demonstrated sustained antigen release and enhanced lymph node drainage compared to the aluminum-adjuvanted group.
• While initial antibody titers were comparable, the nanoparticle vaccine showed significant increases after 2 months, surpassing the control group and indicating long-term immunity potential.

Conclusions:

• MNP-ASP-ETX represents a promising novel vaccine for preventing ETX intoxication in livestock.
• The study provides new strategies for designing and developing effective toxin vaccines.