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Human Cytomegalovirus Delays Neutrophil Apoptosis and Stimulates the Release of a Prosurvival Secretome

Published version
Peer-reviewed

Type

Article

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Authors

Pocock, J 
Storisteanu, D 
Reeves, M 
Juss, J 

Abstract

Human cytomegalovirus (HCMV) is a major cause of viral disease in the young and the immune-suppressed. At sites of infection, HCMV recruits the neutrophil, a cell with a key role in orchestrating the initial immune response. Herein, we report a profound survival response in human neutrophils exposed to the clinical HCMV isolate Merlin, but not evident with the attenuated strain AD169, through suppression of apoptosis. The initial survival event, which is independent of viral gene expression and involves activation of the ERK/MAPK and NF-κB pathways, is augmented by HCMV-stimulated release of a secretory cytokine profile that further prolongs neutrophil lifespan. As aberrant neutrophil survival contributes to tissue damage, we predict that this may be relevant to the immune pathology of HCMV, and the presence of this effect in clinical HCMV strains and its absence in attenuated strains implies a beneficial effect to the virus in pathogenesis and/or dissemination. In addition, we show that HCMV-exposed neutrophils release factors that enhance monocyte recruitment and drive monocyte differentiation to a HCMV-permissive phenotype in an IL-6-dependent manner, thus providing an ideal vehicle for viral dissemination. This study increases understanding of HCMV–neutrophil interactions, highlighting the potential role of neutrophil recruitment as a virulence mechanism to promote HCMV pathology in the host and influence the dissemination of HCMV infection. Targeting these mechanisms may lead to new antiviral strategies aimed at limiting host damage and inhibiting viral spread.

Description

Keywords

human cytomegalovirus, neutrophil, monocyte, polymorphonuclear leukocyte, apoptosis

Journal Title

Frontiers in Immunology

Conference Name

Journal ISSN

1664-3224
1664-3224

Volume Title

8

Publisher

Frontiers Media
Sponsorship
Medical Research Council (MR/L002108/1)
Cambridge University Hospitals NHS Foundation Trust (CUH) (146281)
Medical Research Council (G0701279)
MRC (G0900466/1)
Medical Research Council (MR/P502091/1)
This work was funded by the MRC, the Gates Foundation, NIHR Cambridge Biomedical Research Centre (BRC), and Papworth Hospital. JP is supported by a MRC Clinical Research Training Fellowship (MR/L002108/1) and the Addenbrooke’s Charitable Trust, MR is supported by a MRC Career Development Award (G:0900466) and MW is supported by a MRC Programme Grant (G:0701279).