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Med Microbiol Immunol. 2019 Aug;208(3-4):431-438. doi: 10.1007/s00430-019-00581-1. Epub 2019 Feb 14.

HCMV latency: what regulates the regulators?

Author information

1
Department of Medicine, University of Cambridge, Box 157 Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, UK. ege22@cam.ac.uk.
2
Department of Medicine, University of Cambridge, Box 157 Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, UK. js152@hermes.cam.ac.uk.

Abstract

Human cytomegalovirus (HCMV) latency and reactivation is regulated by the chromatin structure at the major immediate early promoter (MIEP) within myeloid cells. Both cellular and viral factors are known to control this promoter during latency, here we will review the known mechanisms for MIEP regulation during latency. We will then focus on the virally encoded G-protein coupled receptor, US28, which suppresses the MIEP in early myeloid lineage cells. The importance of this function is underlined by the fact that US28 is essential for HCMV latency in CD34+ progenitor cells and CD14+ monocytes. We will describe cellular signalling pathways modulated by US28 to direct MIEP suppression during latency and demonstrate how US28 is able to 'regulate the regulators' of HCMV latency. Finally, we will describe how cell-surface US28 can be a target for antiviral therapies directed at the latent viral reservoir.

KEYWORDS:

Cell signalling; Chromatin; Cytomegalovirus; Latency; US28; Viral reservoir

PMID:
30761409
PMCID:
PMC6647427
DOI:
10.1007/s00430-019-00581-1
[Indexed for MEDLINE]
Free PMC Article

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