Development of oral vaccines for human use

Area of Science:

• Vaccinology
• Biotechnology
• Immunology

Background:

• Oral vaccine formulations are desirable for inducing mucosal immunity in both developed and developing countries.
• Viral and non-viral vector-based delivery of heterologous proteins via the oral route has demonstrated high efficacy.
• Challenges remain in optimizing non-viral vector systems for improved uptake, targeting, antigen presentation, and controlled release.

Purpose of the Study:

• To review the potential and challenges of oral vaccine delivery systems.
• To highlight the advantages of plant-based edible vaccines for global health applications.
• To identify areas for future research in oral vaccination strategies.

Main Methods:

• Review of existing research on viral and non-viral vector-based oral vaccine delivery.
• Analysis of the potential of plant-based systems (recombinant plant viruses, transgenic plants) as edible vaccines.
• Discussion of immunological considerations for oral vaccination, including memory and tolerance.

Main Results:

• Oral delivery via viral or non-viral vectors is effective for inducing mucosal protection.
• Plant viruses offer a viable platform for edible vaccines, leveraging food plants for affordable production.
• Improvements in non-viral vector technology are crucial for consistent immune responses.

Conclusions:

• Edible vaccines derived from plants hold significant promise as cost-effective oral immunization strategies, especially for developing countries.
• Further research is essential to enhance immunological memory and prevent host tolerance following oral vaccination.
• Optimizing vector systems and understanding host immune responses are key to realizing the full potential of oral vaccines.