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HIV-1 Vpr targets PU.1 to vastly alter the antiviral machinery of HIV infected primary human macrophages

ABSTRACT: HIV-1 accessory protein, Vpr, is required for efficient HIV-1 infection of macrophages. Here we show that Vpr reprograms macrophage gene expression by altering the activity of master transcriptional regulator, PU.1, which is responsible for regulating the expression of host immune response genes and is necessary for normal hematopoiesis. In HIV-infected primary macrophages, Vpr-dependent changes in PU.1 levels result in suppression of known anti-viral targets of Vpr including IFITM3 and MRC1. Moreover, we find that PU.1 and its co-factor TET2 are co-recruited to DCAF1 by Vpr and targeted for accelerated degradation. Downmodulation of PU.1 is a highly conserved function of Vpr that is maintained across primate lentiviruses including HIV-2 and several SIVs. In contrast, this activity is not shared by the evolutionarily related accessory protein Vpx. Our findings demonstrate how Vpr dramatically enhances HIV spread in macrophages by targeting a myeloid-specific transcription factor needed for expression of multiple viral restriction factors.

ORGANISM(S): Homo sapiens

PROVIDER: GSE220574 | GEO | 2024/04/30

REPOSITORIES: GEO

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Massive Proteome Remodelling by HIV Vpr

Project description:Viruses target host proteins for degradation to enhance their replication and transmission, and identifying these targets has provided key insights into the host-pathogen interaction1-3. Here, we use complementary unbiased mass spectrometry-based approaches to dissect the widespread proteomeic remodelling seen in HIV-1 infected T-cells. Remarkably, the HIV accessory protein Vpr is both necessary and sufficient to cause the vast majority of these changes. Protein regulation requires recruitment of the DCAF1/DDB1/CUL4 E3 ubiquitin ligase complex, and pulsed-Stable Isotope Labelling with Amino Acids in Cell Culture (SILAC) and immunoprecipitation-mass spectrometry (IP-MS) identified at least 38 cellular proteins directly targeted for degradation by Vpr. Whilst other HIV-1 accessory proteins downregulate a small number of specific host factors, Vpr depletes multiple protein targets, causing systems-level changes to the cellular proteome. A subset of the novel cellular targets identified in this study are depleted by Vpr variants from across HIV-1/SIVcpz and other primate lentiviral lineages, confirming their biological importance in vivo.

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Project description:Studies have shown that HIV-infected patients develop neurocognitive disorders characterized by neuronal dysfunction. The lack of productive infection of neurons by HIV suggests that viral and cellular proteins, with neurotoxic activities, released from HIV-1-infected target cells can cause this neuronal deregulation. The viral protein R (Vpr), a protein encoded by HIV-1, has been shown to alter the expression of various important cytokines and inflammatory proteins in infected and uninfected cells; however the mechanisms involved remain unclear. Using a human neuronal cell line, we found that Vpr can be taken up by neurons causing: (i) deregulation of calcium homeostasis, (ii) endoplasmic reticulum-calcium release, (iii) activation of the oxidative stress pathway, (iv) mitochondrial dysfunction and v- synaptic retraction. In search for the cellular factors involved, we performed microRNAs and gene array assays using human neurons (primary cultures or cell line, SH-SY5Y) that we treated with recombinant Vpr proteins. Interestingly, Vpr deregulates the levels of several microRNAs (e.g. miR-34a) and their target genes (e.g. CREB), which could lead to neuronal dysfunctions. Therefore, we conclude that Vpr plays a major role in neuronal dysfunction through deregulating microRNAs and their target genes, a phenomenon that could lead to the development of neurocognitive disorders. Using primary cultures and neuronal cell lines, we examined the impact of a viral protein (HIV-1 Vpr) on the expression of miRNAs and mRNAs.

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Expression data from human monocyte derived macrophages infected with adenovirus expressing HIV-1 Vpr

2014-04-09 | GSE56591 | GEO

Deregulation of microRNAs by HIV-1 Vpr protein leads to the development of neurocognitive disorders

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Deregulation of microRNAs by HIV-1 Vpr protein leads to the development of neurocognitive disorders [differentiated SH-5Y cells]

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Deregulation of microRNAs by HIV-1 Vpr protein leads to the development of neurocognitive disorders.

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Silencing of unintegrated HIV-1 by SLF2 and the SMC5/6 complex

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Expression data from human monocyte derived dendritic cells infected with adenovirus expressing HIV-1 Vpr

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