Advances in Oral Subunit Vaccine Design

Area of Science:

• Immunology
• Vaccinology
• Gastroenterology

Background:

• Pathogens frequently invade hosts via the intestinal surface, necessitating robust intestinal secretory IgA (SIgA) responses for protection.
• Oral vaccination is the most effective strategy for inducing SIgA, yet faces significant challenges in vaccine development.

Purpose of the Study:

• To review recent advancements in oral vaccine design aimed at overcoming gastrointestinal barriers and inducing potent gut immunity.
• To highlight strategies for developing next-generation oral subunit vaccines.

Main Methods:

• Discussion of challenges in oral vaccine delivery, including degradation in the gastrointestinal tract and immune tolerance.
• Exploration of strategies such as protective delivery systems, mucosal adjuvants, and targeted delivery to immune cells.

Main Results:

• Several strategies have been developed to protect oral vaccine antigens from degradation and enhance their uptake by gut-associated lymphoid tissues.
• Adjuvants and targeting approaches are crucial for overcoming the gut's tolerogenic environment and eliciting strong immune responses.

Conclusions:

• Developing effective oral subunit vaccines requires a combination of strategies to protect antigens, enhance immunogenicity, and overcome gut-specific immune challenges.
• Future oral vaccine design must integrate solutions for antigen stability, targeted delivery, and immune modulation to achieve robust gut immunity.