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Replication-competent HIV-1 in human alveolar macrophages and monocytes despite nucleotide pools with elevated dUTP.
Cui, Junru; Meshesha, Mesfin; Churgulia, Natela; Merlo, Christian; Fuchs, Edward; Breakey, Jennifer; Jones, Joyce; Stivers, James T.
Afiliación
  • Cui J; Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD, 21205-2185, USA.
  • Meshesha M; Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD, 21205-2185, USA.
  • Churgulia N; Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD, 21205-2185, USA.
  • Merlo C; Division of Pulmonary and Critical Care, Johns Hopkins University School of Medicine, 1830 E. Monument Street/5th Floor, Baltimore, MD, 21205, USA.
  • Fuchs E; Division of Clinical Pharmacology, Drug Development Unit, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Blalock 569, Baltimore, MD, 21287, USA.
  • Breakey J; Division of Clinical Pharmacology, Drug Development Unit, The Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Blalock 569, Baltimore, MD, 21287, USA.
  • Jones J; Division of Infectious Diseases, Johns Hopkins University School of Medicine, 1830 E. Monument Street, Baltimore, MD, 21205, USA.
  • Stivers JT; Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD, 21205-2185, USA. jstivers@jhmi.edu.
Retrovirology ; 19(1): 21, 2022 09 16.
Article en En | MEDLINE | ID: mdl-36114511
ABSTRACT

BACKGROUND:

Although CD4+ memory T cells are considered the primary latent reservoir for HIV-1, replication competent HIV has been detected in tissue macrophages in both animal and human studies. During in vitro HIV infection, the depleted nucleotide pool and high dUTP levels in monocyte derived macrophages (MDM) leads to proviruses with high levels of dUMP, which has been implicated in viral restriction or reduced transcription depending on the uracil base excision repair (UBER) competence of the macrophage. Incorporated dUMP has also been detected in viral DNA from circulating monocytes (MC) and alveolar macrophages (AM) of HIV infected patients on antiretroviral therapy (ART), establishing the biological relevance of this phenotype but not the replicative capacity of dUMP-containing proviruses.

RESULTS:

As compared to in vitro differentiated MDM, AM from normal donors had sixfold lower levels of dTTP and a sixfold increased dUTP/dTTP, indicating a highly restrictive dNTP pool for reverse transcription. Expression of uracil DNA glycosylase (UNG) was eightfold lower in AM compared to the already low levels in MDM. Accordingly, ~ 80% of HIV proviruses contained dUMP, which persisted for at least 14-days due to low UNG excision activity. Unlike MDM, AM expression levels of UNG and SAM and HD domain containing deoxynucleoside triphosphate triphosphohydrolase 1 (SAMHD1) increased over 14 days post-HIV infection, while dUTP nucleotidohydrolase (DUT) expression decreased. These AM-specific effects suggest a restriction response centered on excising uracil from viral DNA copies and increasing relative dUTP levels. Despite the restrictive nucleotide pools, we detected rare replication competent HIV in AM, peripheral MC, and CD4+ T cells from ART-treated donors.

CONCLUSIONS:

These findings indicate that the potential integration block of incorporated dUMP is not realized during in vivo infection of AM and MC due to the near absence of UBER activity. In addition, the increased expression of UNG and SAMHD1 in AM post-infection is too slow to prevent integration. Accordingly, dUMP persists in integrated viruses, which based on in vitro studies, can lead to transcriptional silencing. This possible silencing outcome of persistent dUMP could promote viral latency until the repressive effects of viral dUMP are reversed.
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Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Infecciones por VIH / VIH-1 Límite: Humans Idioma: En Revista: Retrovirology Asunto de la revista: VIROLOGIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Infecciones por VIH / VIH-1 Límite: Humans Idioma: En Revista: Retrovirology Asunto de la revista: VIROLOGIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos