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IFN-?3 polymorphism indirectly influences NK cell phenotype and function during acute HCV infection.

ABSTRACT: Polymorphisms in the type III interferon IFN-?3 and the killer cell immunoglobulin-like receptor (KIR) genes controlling the activity of natural killer (NK) cells can predict spontaneous resolution of acute hepatitis C virus (HCV) infection. We hypothesized that IFN-?3 polymorphism may modulate NK cell function during acute HCV.We monitored the plasma levels of type III IFNs in relation to the phenotype and the function of NK cells in a cohort of people who inject drugs (PWID) during acute HCV infection with different outcomes.Early acute HCV was associated with high variability in type III IFNs plasma levels and the favorable IFN-?3 CC genotype was associated with higher viral loads. Reduced expression of Natural Killer Group Protein 2A (NKG2A) was associated with lower IFN-?3 plasma levels and the CC genotype. IFN-? production by NK cells was higher in individuals with the CC genotype during acute infection but this did not prevent viral persistence. IFN-?3 plasma levels did not correlate with function of NK cells and IFN-?3 prestimulation did not affect NK cell activation and function.These results suggest that IFN-?3 polymorphism indirectly influences NK cell phenotype and function during acute HCV but other factors may act in concert to determine the outcome of the infection.

SUBMITTER: Depla M

PROVIDER: S-EPMC5004291 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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IFN-λ3 polymorphism indirectly influences NK cell phenotype and function during acute HCV infection.

Depla Marion M Pelletier Sandy S Bédard Nathalie N Brunaud Camille C Bruneau Julie J Shoukry Naglaa H NH

Immunity, inflammation and disease 20160816 3

<h4>Introduction</h4>Polymorphisms in the type III interferon IFN-λ3 and the killer cell immunoglobulin-like receptor (KIR) genes controlling the activity of natural killer (NK) cells can predict spontaneous resolution of acute hepatitis C virus (HCV) infection. We hypothesized that IFN-λ3 polymorphism may modulate NK cell function during acute HCV.<h4>Methods</h4>We monitored the plasma levels of type III IFNs in relation to the phenotype and the function of NK cells in a cohort of people who i ...[more]

PMID: 27621819

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Project description:Interferon lambda (IFN-λ) is a relatively unexplored, yet promising antiviral agent. IFN-λ has recently been tested in clinical trials of chronic hepatitis B virus infection (CHB), with the advantage that side effects may be limited compared with IFN-α, as IFN-λ receptors are found only in epithelial cells. To date, IFN-λ's downstream signaling pathway remains largely unelucidated, particularly via proteomics methods. Here, we report that IFN-λ3 inhibits HBV replication in HepG2.2.15 cells, reducing levels of both HBV transcripts and intracellular HBV DNA. Quantitative proteomic analysis of HBV-transfected cells was performed following 24-hour IFN-λ3 treatment, with parallel IFN-α2a and PBS treatments for comparison using a dimethyl labeling method. The depth of the study allowed us to map the induction of antiviral proteins to multiple points of the viral life cycle, as well as facilitating the identification of antiviral proteins not previously known to be elicited upon HBV infection (e.g. IFITM3, XRN2, and NT5C3A). This study also shows up-regulation of many effectors involved in antigen processing/presentation indicating that this cytokine exerted immunomodulatory effects through several essential molecules for these processes. Interestingly, the 2 subunits of the immunoproteasome cap (PSME1 and PSME2) were up-regulated whereas cap components of the constitutive proteasome were down-regulated upon both IFN treatments, suggesting coordinated modulation toward the antigen processing/presentation mode. Furthermore, in addition to confirming canonical activation of interferon-stimulated gene (ISG) transcription through the JAK-STAT pathway, we reveal that IFN-λ3 restored levels of RIG-I and RIG-G, proteins known to be suppressed by HBV. Enrichment analysis demonstrated that several biological processes including RNA metabolism, translation, and ER-targeting were differentially regulated upon treatment with IFN-λ3 versus IFN-α2a. Our proteomic data suggests that IFN-λ3 regulates an array of cellular processes to control HBV replication.

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IFN-?3 polymorphism indirectly influences NK cell phenotype and function during acute HCV infection.

Publications

IFN-λ3 polymorphism indirectly influences NK cell phenotype and function during acute HCV infection.

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