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IL-15-DEPENDENT IMMUNE CROSS-TALK BETWEEN NK CELLS AND DENDRITIC CELLS IN HIV-1 ELITE CONTROLLERS [CUT&RUN]

ABSTRACT: IL-15-DEPENDENT IMMUNE CROSS-TALK BETWEEN NK CELLS AND DENDRITIC CELLS IN HIV-1 ELITE CONTROLLERS [CUT&RUN]

PROVIDER: PRJNA974418 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24660000_1.fastq.gz	Fastqsanger.gz
	SRR24660000_2.fastq.gz	Fastqsanger.gz
	SRR24660001_1.fastq.gz	Fastqsanger.gz
	SRR24660001_2.fastq.gz	Fastqsanger.gz
	SRR24660002_1.fastq.gz	Fastqsanger.gz

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IL-15-DEPENDENT IMMUNE CROSS-TALK BETWEEN NK CELLS AND DENDRITIC CELLS IN HIV-1 ELITE CONTROLLERS [CUT&RUN]

Project description:As the principal effector cell population of the innate immune system, NK cells may make critical contributions to natural, immune-mediated control of HIV-1 replication. Using genome-wide assessments of activating and inhibitory epigenetic chromatin features, we here demonstrate that cytotoxic NK (cNK) cells from elite controllers (ECs) frequently display elevated activating histone modifications at the IL-2/IL-15 receptor β chain and the BCL-2 gene loci. These epigenetic changes translated into increased responsiveness of cNK cells to paracrine IL-15 secretion, which coincided with higher levels of IL-15 transcription by myeloid dendritic cells in ECs. The distinct immune crosstalk between these two innate immune cell populations resulted in improved IL-15-dependent cNK cell survival, paired with a metabolic profile biased towards IL-15-mediated glycolytic activities. Together, these results suggest that cNK cells from ECs display an epigenetically-programmed IL-15 response signature, and support the emerging role of innate immune pathways in natural, drug-free control of HIV-1.

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MicroRNAs differentially present in the plasma of HIV elite controllers

Project description:Elite controllers maintain HIV-1 viral loads below the limit of detection. The mechanisms responsible for this phenomenon are poorly understood. As microRNAs (miRNAs) are regulators of gene expression and some of them modulate HIV infection, we have studied the miRNA profile in plasma from HIV elite controllers and chronically infected individuals and compared against healthy donors. Several miRNAs correlate with CD4+ T cell count or with the known time of infection. No significant differences were observed between elite controllers and healthy donors; however, 16 miRNAs were different in the plasma of chronic infected versus healthy donors. In addition, levels of hsa-miR-29b-3p, hsa-miR-33a-5p and hsa-miR-146a-5p were higher in plasma from elite controllers than chronic infected and hsa-miR-29b-3p and hsa-miR-33a-5p overexpression significantly reduced the viral production in MT2 cells. Therefore, levels of circulating miRNAs might be of diagnostic and/or prognostic value for HIV infection. Additionally, hsa-miR-29b-3p and miR-33a-5p may be used in therapeutic strategies. An exploratory cross-sectional study of microRNA levels in EDTA plasma samples. Plasma samples were obtained from 24 subjects and were classified in 3 groups, 9 Elite Controllers (defined as individuals with plasma viral load (PVL) < 50 copies/ml, CD4 count >350/ml), 9 chronic HIV patients (CH) under anti-retroviral treatment and 6 healthy HIV negative donors (HD). This study was approved by the HuM-CM-)sped Foundation Ethics Committee and informed consent was obtained from all subjects.

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Project description:This SuperSeries is composed of the SubSeries listed below.

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