Boosting subdominant neutralizing antibody responses with a computationally designed epitope-focused immunogen

Area of Science:

• Immunology
• Vaccinology
• Structural Biology

Background:

• Vaccine development struggles to target conserved epitopes for pathogens like respiratory syncytial virus (RSV), influenza, and dengue.
• Potent neutralizing antibodies are often subdominant during natural infection, limiting their impact.

Purpose of the Study:

• To investigate computationally designed epitope-focused immunogens for vaccine development.
• To overcome immunodominance hierarchies and enhance responses to crucial neutralization epitopes.

Main Methods:

• Design of an epitope-focused immunogen presenting a single RSV neutralization epitope.
• Comparison of immune responses elicited by the epitope-focused immunogen versus the viral fusion protein.
• Assessment of boosting effects on pre-existing antibody responses and neutralization.

Main Results:

• The epitope-focused immunogen induced superior epitope-specific antibody responses compared to the viral fusion protein.
• The immunogen effectively boosted antibodies targeting the palivizumab epitope, enhancing neutralization.
• Demonstrated ability to boost subdominant neutralizing antibody responses in vivo.

Conclusions:

• Epitope-focused immunogens can reshape established antibody hierarchies.
• This strategy holds promise for developing next-generation vaccines against challenging pathogens.
• Overcoming immunodominance is key for eliciting potent antibody responses.