The antiviral factor APOBEC3G improves CTL recognition of cultured HIV-infected T cells. - Archive ouverte HAL Access content directly
Journal Articles Journal of Experimental Medicine Year : 2010

The antiviral factor APOBEC3G improves CTL recognition of cultured HIV-infected T cells.

Nicoletta Casartelli
Florence Guivel-Benhassine
Olivier Schwartz
  • Function : Author
  • PersonId : 999827
Arnaud Moris
  • Function : Correspondent author
  • PersonId : 867381

Connectez-vous pour contacter l'auteur

Abstract

The cytidine deaminase APOBEC3G (A3G) enzyme exerts an intrinsic anti-human immunodeficiency virus (HIV) defense by introducing lethal G-to-A hypermutations in the viral genome. The HIV-1 viral infectivity factor (Vif) protein triggers degradation of A3G and counteracts this antiviral effect. The impact of A3G on the adaptive cellular immune response has not been characterized. We examined whether A3G-edited defective viruses, which are known to express truncated or misfolded viral proteins, activate HIV-1-specific (HS) CD8+ cytotoxic T lymphocytes (CTLs). To this end, we compared the immunogenicity of cells infected with wild-type or Vif-deleted viruses in the presence or absence of the cytidine deaminase. The inhibitory effect of A3G on HIV replication was associated with a strong activation of cocultivated HS-CTLs. CTL activation was particularly marked with Vif-deleted HIV and with viruses harboring A3G. Enzymatically inactive A3G mutants failed to enhance CTL activation. We also engineered proviruses bearing premature stop codons in their genome as scars of A3G editing. These viruses were not infectious but potently activated HS-CTLs. Therefore, the pool of defective viruses generated by A3G represents an underestimated source of viral antigens. Our results reveal a novel function for A3G, acting not only as an intrinsic antiviral factor but also as an inducer of the adaptive immune system.
Fichier principal
Vignette du fichier
casartelli_2010.pdf (3.73 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

pasteur-00458098 , version 1 (20-08-2010)

Identifiers

Cite

Nicoletta Casartelli, Florence Guivel-Benhassine, Romain Bouziat, Samantha Brandler, Olivier Schwartz, et al.. The antiviral factor APOBEC3G improves CTL recognition of cultured HIV-infected T cells.. Journal of Experimental Medicine, 2010, 207 (1), pp.39-49, S1-2. ⟨10.1084/jem.20091933⟩. ⟨pasteur-00458098⟩

Collections

PASTEUR CNRS
89 View
345 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More