Epitope targeting with self-assembled peptide vaccines.

Area of Science:

• Vaccinology
• Nanotechnology
• Immunology

Background:

• Nanoparticle delivery systems accelerate vaccine development.
• A previously described 61-amino acid carrier forms coiled-coil nanoparticles.
• This carrier can be functionalized with T cell epitopes.

Purpose of the Study:

• To expand the utility of the nanoparticle carrier by appending B cell epitopes.
• To create a simplified vaccine platform eliminating traditional conjugation.
• To test the efficacy of this new platform in preclinical models.

Main Methods:

• Appending B cell epitopes (Tau, amyloid-β, GnRH, IgE, influenza HA stem) to the nanoparticle carrier.
• Characterizing particle assembly using biophysical techniques (CD, AUC, DLS).
• Evaluating vaccine efficacy in outbred mice against multiple targets.

Main Results:

• Peptides assembled into ~20 nm particles and induced antibody responses.
• Vaccines targeting gonadotropin-releasing hormone reduced fertility in male mice.
• Anti-IgE antibodies reduced free IgE and prevented anaphylaxis.
• Influenza HA stem epitope antibodies protected against lethal H1N1 challenge.

Conclusions:

• The nanoparticle platform efficiently elicits antibodies against various B cell epitopes.
• This approach simplifies vaccine development and conjugation.
• The platform shows promise for prophylactic and therapeutic applications.