Mosaic vaccine-induced antibody-dependent cellular phagocytosis associated with delayed HIV-1 viral load rebound post treatment interruption

Thembi Mdluli, Bonnie M. Slike, Daniel J. Curtis, Zhanna Shubin, Ursula Tran, Yifan Li, Vincent Dussupt, Letzibeth Mendez-Rivera, Suteeraporn Pinyakorn, Daniel J. Stieh, Frank L. Tomaka, Hanneke Schuitemaker, Maria G. Pau, Donn J. Colby, Eugène Kroon, Carlo Sacdalan, Mark de Souza, Nittaya Phanupak, Denise C. Hsu, Jintanat AnanworanichJulie A. Ake, Lydie Trautmann, Sandhya Vasan, Merlin L. Robb, Shelly J. Krebs, Dominic Paquin-Proulx, Morgane Rolland*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A heterologous Ad26/MVA vaccine was given prior to an analytic treatment interruption (ATI) in people living with HIV-1 (mainly CRF01_AE) who initiated antiretroviral treatment (ART) during acute HIV-1. We investigate the impact of Ad26/MVA vaccination on antibody (Ab)-mediated immune responses and their effect on time to viral rebound. The vaccine mainly triggers vaccine-matched binding Abs while, upon viral rebound post ATI, infection-specific CRF01_AE binding Abs increase in all participants. Binding Abs are not associated with time to viral rebound. The Ad26/MVA mosaic vaccine profile consists of correlated non-CRF01_AE binding Ab and Fc effector features, with strong Ab-dependent cellular phagocytosis (ADCP) responses. CRF01_AE-specific ADCP responses (measured either prior to or post ATI) are significantly higher in individuals with delayed viral rebound. Our results suggest that vaccines eliciting cross-reactive responses with circulating viruses in a target population could be beneficial and that ADCP responses may play a role in viral control post treatment interruption.

Original languageEnglish
Article number114344
JournalCell Reports
Volume43
Issue number6
DOIs
StatePublished - 25 Jun 2024
Externally publishedYes

Keywords

  • ADCP
  • CP: Immunology
  • CP: Microbiology
  • Fc effector responses
  • HIV-1
  • PLWH
  • acute infection
  • analytic treatment interruption
  • antibody responses
  • time to viral rebound
  • vaccine

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