Altering the competitive environment of B cell epitopes significantly extends the duration of antibody production.

This article investigates factors influencing the duration of immunoglobulin G (IgG) antibody production against linear B cell epitopes, focusing on persistent IgG production (PIP) versus transient IgG production (TIP). Using the peste des petits ruminants (PPR) virus live-attenuated vaccine and synthetic peptides conjugated to bovine serum albumin (BSA), the study demonstrates that the same peptide epitopes induce TIP when presented in the viral context but can induce PIP when conjugated to BSA, highlighting the roles of amino acid sequence, protein carrier, and immunization program in determining IgG longevity. Notably, PIP induced by BSA-peptide conjugates was sustained for over 368 days and was not diminished by subsequent vaccination with the live-attenuated virus, whereas coimmunization with both immunogens resulted in only slightly extended TIP. These findings suggest that modifying the competitive environment of epitopes can transform transient antibody responses into persistent ones, offering insights for peptide vaccine development targeting linear neutralizing epitopes from various viruses.