Cell Reports (Jun 2024)

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 Ananworanich,
  • Julie A. Ake,
  • Lydie Trautmann,
  • Sandhya Vasan,
  • Merlin L. Robb,
  • Shelly J. Krebs,
  • Dominic Paquin-Proulx,
  • Morgane Rolland

Journal volume & issue
Vol. 43, no. 6
p. 114344

Abstract

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Summary: 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.

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