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IFN-gamma+ NK cells control TRAIL+ anti-inflammatory astrocytes

ABSTRACT: IFN-gamma+ NK cells control TRAIL+ anti-inflammatory astrocytes

PROVIDER: PRJNA605158 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10992219.fastq.gz	Fastqsanger.gz
	SRR10992220.fastq.gz	Fastqsanger.gz
	SRR10992221.fastq.gz	Fastqsanger.gz
	SRR10992222.fastq.gz	Fastqsanger.gz
	SRR11034911_1.fastq.gz	Fastqsanger.gz

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Hepatitis D infection induces IFN-β-mediated NK cell activation and TRAIL-dependent cytotoxicity

Project description:The co-infection of hepatitis B (HBV) patients with the hepatitis D virus (HDV) causes the most severe form of viral hepatitis and thus drastically worsens the course of the disease. Therapy options for HBV/HDV patients are still limited. Here, we investigated the potential of natural killer (NK) cells that are crucial drivers of the innate immune response against viruses to target HDV-infected hepatocytes. We established in vitro co-culture models using HDV-infected hepatoma cell lines and human peripheral blood NK cells. We determined NK cell activation by flow cytometry, transcriptome analysis, bead-based cytokine immunoassays, and NK cell-mediated effects on T cells by flow cytometry. We validated the mechanisms using CRISPR/Cas9-mediated gene deletions. Moreover, we assessed the frequencies and phenotype of NK cells in peripheral blood of HBV and HDV superinfected patients. Upon co-culture with HDV-infected hepatic cell lines, NK cells upregulated activation markers, interferon-stimulated genes (ISGs) including the death receptor ligand tumor necrosis factor-related apoptosis-inducing ligand (TRAIL), produced interferon (IFN)-gamma and eliminated HDV-infected cells via the TRAIL-TRAIL-R2 axis. We identified IFN-beta released by HDV-infected cells as an important enhancer of NK cell activity. In line with our in vitro data, we observed activation of peripheral blood NK cells from HBV/HDV co-infected, but not HBV mono-infected patients. Our data demonstrate NK cell activation in HDV infection and their potential to eliminate HDV-infected hepatoma cells via the TRAIL/TRAIL-R2 axis which implies a high relevance of NK cells for the design of novel anti-viral therapies.

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Project description:The anti-leukemia activity of NK cells helps to prevent relapse during hematopoietic stem cell transplantation in leukemia patients. However, the factors that determine sensitivity or resistance of leukemia cells in the context of NK-mediated cytotoxicity are not well established. Here we performed a genome-wide CRIPSR screen in the human chronic-myelogenous-leukemia (CML) cell line K562 to identify genes that regulate vulnerability of leukemia cells to killing by primary human NK cells. Distribution of guide RNAs (gRNAs) in K562 cells that survived co-incubation with NK cells showed that loss of NCR3LG1, which encodes the ligand of the natural cytotoxicity receptor NKp30, protected K562 cells from killing. In contrast, loss of genes that regulate pathways for antigen-presentation and interferon-gamma-signaling increased the vulnerability of K562 cells. Addition of IFN-gamma neutralizing antibody increased the susceptibility of K562 cells to NK-mediated killing. Upregulation of MHC class I on K562 cells after co-incubation with NK cells was dependent on IFNGR2. Analysis of RNA-seq data from The Cancer Genome Atlas (TCGA) showed that low IFNGR2 expression in cancer tissues associated with improved overall survival in acute myeloid leukemia (AML) and Kidney Renal Clear Cell Carcinoma (KIRC) patients. Our results showing that upregulation of MHC class I by NK-derived IFN-gamma leads to resistance to NK cytotoxicity suggest that targeting IFN-gamma responses might be a promising approach to enhance NK cell anti-cancer efficacy.

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IFN-gamma+ NK cells control TRAIL+ anti-inflammatory astrocytes

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