Extended SARS-CoV-2 RBD booster vaccination induces humoral and cellular immune tolerance in mice.

ABSTRACT: The repetitive applications of vaccine boosters have been brought up in face of continuous emergence of SARS-CoV-2 variants with neutralization escape mutations, but their protective efficacy and potential adverse effects remain largely unknown. Here, we compared the humoral and cellular immune responses of an extended course of recombinant receptor binding domain (RBD) vaccine boosters with those from conventional immunization strategy in a Balb/c mice model. Multiple vaccine boosters after the conventional vaccination course significantly decreased RBD-specific antibody titers and serum neutralizing efficacy against the Delta and Omicron variants, and profoundly impaired CD4⁺ and CD8⁺T cell activation and increased PD-1 and LAG-3 expressions in these T cells. Mechan

SUBMITTER: Gao FX 

PROVIDER: S-EPMC9625849 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature