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Downregulation of HLA-I by the molluscum contagiosum virus mc080 impacts NK-cell recognition and promotes CD8+ T-cell evasion

Elasifer, Hana, Wang, Eddie C.Y. ORCID:, Prod'homme, Virginie ORCID:, Davies, James ORCID:, Forbes, Simone, Stanton, Richard J. ORCID:, Patel, Mihil, Fielding, Ceri A. ORCID:, Roberts, Dawn, Traherne, James A., Gruber, Nicole, Bugert, Joachim J. ORCID:, Aicheler, Rebecca J. and Wilkinson, Gavin W. G. 2020. Downregulation of HLA-I by the molluscum contagiosum virus mc080 impacts NK-cell recognition and promotes CD8+ T-cell evasion. Journal of General Virology 101 , pp. 863-872. 10.1099/jgv.0.001417

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Molluscum contagiosum virus (MCV) is a common cause of benign skin lesions in young children and currently the only endemic human poxvirus. Following the infection of primary keratinocytes in the epidermis, MCV induces the proliferation of infected cells and this results in the production of wart-like growths. Full productive infection is observed only after the infected cells differentiate. During this prolonged replication cycle the virus must avoid elimination by the host immune system. We therefore sought to investigate the function of the two major histocompatibility complex class-I-related genes encoded by the MCV genes mc033 and mc080. Following insertion into a replication-deficient adenovirus vector, codon-optimized versions of mc033 and mc080 were expressed as endoglycosidase-sensitive glycoproteins that localized primarily in the endoplasmic reticulum. MC080, but not MC033, downregulated cell-surface expression of endogenous classical human leucocyte antigen (HLA) class I and non-classical HLA-E by a transporter associated with antigen processing (TAP)-independent mechanism. MC080 exhibited a capacity to inhibit or activate NK cells in autologous assays in a donor-specific manner. MC080 consistently inhibited antigen-specific T cells being activated by peptide-pulsed targets. We therefore propose that MC080 acts to promote evasion of HLA-I-restricted cytotoxic T cells.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Systems Immunity Research Institute (SIURI)
Publisher: Microbiology Society
ISSN: 0022-1317
Funders: MRC
Date of First Compliant Deposit: 10 June 2020
Date of Acceptance: 26 March 2020
Last Modified: 24 Feb 2024 10:32

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