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Published in: Virology Journal 1/2020

Open Access 01-12-2020 | Merkel Cell Carcinoma | Research

Promoter activity of Merkel cell Polyomavirus variants in human dermal fibroblasts and a Merkel cell carcinoma cell line

Authors: Ibrahim Abdulsalam, Kashif Rasheed, Baldur Sveinbjørnsson, Bernhard Ehlers, Ugo Moens

Published in: Virology Journal | Issue 1/2020

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Abstract

Background

Merkel cell polyomavirus (MCPyV) is a human polyomavirus that establishes a life-long harmless infection in most individuals, with dermal fibroblasts believed to be the natural host cell. However, this virus is the major cause of Merkel cell carcinoma (MCC), an aggressive skin cancer. Several MCPyV variants with polymorphism in their promoter region have been isolated, but it is not known whether these differences affect the biological properties of the virus.

Methods

Using transient transfection studies in human dermal fibroblasts and the MCC cell line MCC13, we compared the transcription activity of the early and late promoters of the most commonly described non-coding control region MCPyV variant and six other isolates containing specific mutation patterns.

Results

Both the early and late promoters were significantly stronger in human dermal fibroblasts compared with MCC13 cells, and a different promoter strength between the MCPyV variants was observed. The expression of full-length large T-antigen, a viral protein that regulates early and late promoter activity, inhibited early and late promoter activities in both cell lines. Nonetheless, a truncated large T-antigen, which is expressed in virus-positive MCCs, stimulated the activity of its cognate promoter.

Conclusion

The promoter activities of all MCPyV variants tested was stronger in human dermal fibroblasts, a cell line that supports viral replication, than in MCC13 cells, which are not permissive for MCPyV. Truncated large T-antigen, but not full-length large T-antigen stimulated viral promoter activity. Whether, the difference in promoter strength and regulation by large T-antigen may affect the replication and tumorigenic properties of the virus remains to be determined.
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Metadata
Title
Promoter activity of Merkel cell Polyomavirus variants in human dermal fibroblasts and a Merkel cell carcinoma cell line
Authors
Ibrahim Abdulsalam
Kashif Rasheed
Baldur Sveinbjørnsson
Bernhard Ehlers
Ugo Moens
Publication date
01-12-2020
Publisher
BioMed Central
Published in
Virology Journal / Issue 1/2020
Electronic ISSN: 1743-422X
DOI
https://doi.org/10.1186/s12985-020-01317-x

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