Preexisting memory CD4+ T cells contribute to the primary response in an HIV-1 vaccine trial.

Journal Article (Journal Article;Multicenter Study)

Naive and memory CD4+ T cells reactive with human immunodeficiency virus type 1 (HIV-1) are detectable in unexposed, unimmunized individuals. The contribution of preexisting CD4+ T cells to a primary immune response was investigated in 20 HIV-1-seronegative volunteers vaccinated with an HIV-1 envelope (Env) plasmid DNA prime and recombinant modified vaccinia virus Ankara (MVA) boost in the HVTN 106 vaccine trial ( NCT02296541). Prevaccination naive or memory CD4+ T cell responses directed against peptide epitopes in Env were identified in 14 individuals. After priming with DNA, 40% (8/20) of the elicited responses matched epitopes detected in the corresponding preimmunization memory repertoires, and clonotypes were shared before and after vaccination in 2 representative volunteers. In contrast, there were no shared epitope specificities between the preimmunization memory compartment and responses detected after boosting with recombinant MVA expressing a heterologous Env. Preexisting memory CD4+ T cells therefore shape the early immune response to vaccination with a previously unencountered HIV-1 antigen.

Full Text

Duke Authors

Cited Authors

  • Campion, SL; Brenna, E; Thomson, E; Fischer, W; Ladell, K; McLaren, JE; Price, DA; Frahm, N; McElrath, JM; Cohen, KW; Maenza, JR; Walsh, SR; Baden, LR; Haynes, BF; Korber, B; Borrow, P; McMichael, AJ

Published Date

  • December 1, 2021

Published In

Volume / Issue

  • 131 / 23

PubMed ID

  • 34850742

Pubmed Central ID

  • PMC8631594

Electronic International Standard Serial Number (EISSN)

  • 1558-8238

Digital Object Identifier (DOI)

  • 10.1172/JCI150823


  • eng

Conference Location

  • United States