Activation of ISR/ATF4 signaling depletes HIV reservoir in CD4+ T cells
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ABSTRACT:
PROVIDER: PRJNA867681 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR20989841_1.fastq.gz | Fastqsanger.gz | |||
| SRR20989841_2.fastq.gz | Fastqsanger.gz | |||
| SRR20989842_1.fastq.gz | Fastqsanger.gz | |||
| SRR20989842_2.fastq.gz | Fastqsanger.gz | |||
| SRR20989843_1.fastq.gz | Fastqsanger.gz |
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Project description:Latent HIV reservoirs are extremely stable which pose a tremendous challenge to eradicate HIV. Here, we show that HIV explores the integrated stress response (ISR) signaling to establish its quiescent infection, refractory to the clearance for its persistence. HA15, a recently characterized specific ISR agonist, activates ATF4/CHOP signaling to not only disrupt HIV latency but also reduce HIV+ cells in the primary CD4+ T cell model of HIV latency without the induction of cell death in the HIV negative primary CD4+ T cells and the impact of viability in resting CD4+ T cells isolated from people living with HIV (PLWH). Mechanistically, the reduction of HIV+ cells by ISR/ATF4 activation is associated with the enhancement of cellular apoptosis. However, this mainly occurs in the HIV translation negative CD4+ T cells. In fact, ISR/ATF4 activation-induced cell death largely occurs in HIV transcription active (HIV gag-pol) CD4+ T cells. This is involved in HIV RNA-induced innate immune IFIT signaling. During the acute SIV infection in the rhesus macaques, the induction of ATF4 is associated with decrease of SIV reservoir in the intestine in vivo. When further tested in the resting CD4+ T cells isolated from PLWH on ART, the induction of ISR/ATF4 signaling by HA15 reduced HIV DNA reservoir. These findings support that inactivation of ISR/ATF4 signaling is associated with the maintenance of the stable and quiescent HIV reservoirs while enforced ISR/ATF4 signaling reduces translation quiescent HIV reservoirs in CD4+ T cells.
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Project description:To identify the target genes of integrated stress reponse (ISR), we have employed whole genome microarray expression in MEF cells. ISR gene setimation under ER stress condition using Perk -/-, Atf4 -/-, eIF2a S51A mutant, Fv2E-PERK MEF cells
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Project description:The size of lentiviral DNA reservoirs reflects effectiveness of immune responses against lentiviruses. So far, abundant information has been gathered on the control of HIV-1 replication. Understanding of innate mechanisms contributing to containment of HIV-DNA reservoir, however, are only partly clarified and are relevant to guide interventions for reservoir containment or eradication. We studied the contribution of Natural Killer (NK) cell functional features in HIV patients either controlling replication either spontaneously (HIC) or after progression and antiretroviral treatment (PP). An inverse correlation between HIV-DNA copy numbers (either total or integrated) in circulating CD4+ cells and NK cell function were observed. Induced IFN-gamma production and NKp46/NKp30 activating receptor-induced expression correlated inversely with reservoir size. The correlation was present not only when considering a homogeneous cohort of HIC patients, but also when PP patients were included in the analysis. Adaptive (NKG2C + CD57 + ) NK cell features were not associated with reservoir size. However a distinct set of 370 differentially expressed transcripts was found to underlie functional differences in NK cells controlling HIV-DNA reservoir size. In proof-of-principle in vitro experiments of CD4+ cell infection with HIV-1, purified NK cells with the above functional/transcriptional features displayed a 10- and 30-fold higher ability to control HIV replication and DNA burden in vitro, respectively, compared to other NK cells. Thus, NK cells with a specific functional and transcriptional signature contribute to control of HIV reservoir in CD4+ cells. Their selection, expansion and/or adoptive transfer may support strategies to eradicate HIV-1 infection or to safely deescalate antiretroviral treatment.
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Project description:Identifying cellular mechanisms maintaining HIV-1 latency in the viral reservoir is crucial for devising effective cure strategies. Here we developed a flow cytometry-fluorescent in situ hybridization (flow-FISH) approach using a combination of probes that detects abortive and elongated HIV-1 transcripts for ex vivo isolation and characterization of viral reservoir cells in peripheral blood from people with HIV-1. Following the isolation of three distinct cell populations from CD4+ T cells (i.e. cells harboring transcriptionally latent HIV-1, cells harboring transcriptionally active HIV-1, or uninfected cells), we determined their transcriptomic profile by RNA sequencing (RNAseq). Supervised gene expression analysis identified several differentially expressed mitochondrial genes in infected cell populations compared to uninfected cells, but also in latently infected compared to productively infected CD4+ T cells. Our transcriptomic profiling data shows an association between diminished mitochondrial functioning and the transcriptional activity of the viral reservoir. These findings underline the relevance of metabolic regulation in HIV-1 infection, and support the development of strategies modulating immunometabolism to target viral latency.
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Project description:Cells rapidly and extensively remodel their transcriptome in response to stress to restore homeostasis, but the underlying mechanisms are not fully understood. Here we characterize the dynamic changes in transcriptome, epigenetics, and 3D genome organization during the integrated stress response (ISR). ISR induction triggers widespread transcriptional changes within 6 hours, coinciding with increased binding of ATF4, a key transcriptional effector. Notably, ATF4 binds to hundreds of genes even under non-stress conditions, priming them for stronger activation upon stress. The transcriptional changes during ISR do not rely on increased H3K27 acetylation, chromatin accessibility, or rewired enhancer-promoter looping. Instead, ATF4-mediated gene activation is linked to the redistribution of CEBPγ from non-ATF4 sites to a subset of ATF4-bound regions, likely by forming an ATF4/CEBPγ heterodimer. CEBPγ preferentially targets the sites pre-occupied by ATF4, as well as genomic regions exhibiting a unique higher-order chromatin structure signature. Thus, the transcriptional responses during ISR are largely pre-wired by intrinsic chromatin properties. These findings provide novel insights into transcriptional remodeling during ISR with broader implications for other stress responses. Through the IP-MS experiments, we determined the proteins that interacted with ATF4 and their change during ISR.
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