Egg Yolk Antibody for Passive Immunization: Status, Challenges, and Prospects

Area of Science:

• Immunology
• Biotechnology
• Veterinary Medicine

Background:

• Immunoglobulin Y (IgY) from hyperimmune egg yolk is explored as a passive immune agent for microbial infections in humans and livestock.
• Previous research on specific egg yolk IgY for pathogen control has yielded limited success, and oral IgY products lack regulatory endorsement.
• Key challenges in IgY-based passive immunization have not been comprehensively addressed, impeding product development.

Purpose of the Study:

• To review and holistically discuss the major challenges impeding the development of effective egg yolk IgY products for human and animal passive immunization.
• To explore potential solutions for overcoming these challenges, including encapsulation technologies for IgY stabilization.
• To provide an updated perspective on the application of IgY technology in combating the COVID-19 pandemic.

Main Methods:

• Literature review summarizing existing studies on IgY technology for passive immunization.
• Analysis of critical challenges associated with IgY, including in vivo stability, purification, heterologous immunogenicity, and repertoire diversity.
• Discussion of potential solutions and emerging applications, such as encapsulation and COVID-19 countermeasures.

Main Results:

• Identified significant challenges in IgY stability, purification processes, potential for heterologous immune responses, and the diversity of IgY repertoires.
• Highlighted the lack of regulatory approval for orally administered commercial IgY products due to unaddressed efficacy and safety concerns.
• Explored encapsulation technologies as a promising strategy to enhance IgY stability and bioavailability.

Conclusions:

• Overcoming the identified challenges in IgY stability, purification, immunogenicity, and diversity is crucial for the successful development of IgY-based passive immunization strategies.
• Innovative approaches like encapsulation are essential for improving the efficacy and therapeutic potential of egg yolk IgY.
• Further research and development are needed to validate IgY products for human and veterinary applications, including its potential role against emerging infectious diseases like COVID-19.