Delta-catenin is required for cell proliferation in virus-positive Merkel cell carcinoma cell lines but not in human fibroblasts
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View abstract on PubMed
Summary
This summary is machine-generated.Merkel cell polyomavirus (MCPyV) replicates in fibroblasts but causes Merkel cell carcinoma (MCC) in a different cell type. This study identifies δ-catenin as a key factor in MCC proliferation, distinct from its role in viral replication.
Area Of Science
- Oncology and Virology
- Molecular Biology and Cancer Research
Background
- Merkel cell carcinoma (MCC) is an aggressive skin cancer linked to Merkel cell polyomavirus (MCPyV).
- MCPyV replication occurs in fibroblasts, but the cell of origin for MCC remains unidentified.
- Viral oncoproteins, small tumor (ST) and truncated large tumor (t-LT) antigens, drive MCC development.
Purpose Of The Study
- To investigate the cell of origin for MCPyV-driven Merkel cell carcinoma.
- To identify host factors involved in MCPyV infection and MCC tumorigenesis.
- To elucidate the role of δ-catenin in MCC development and viral replication.
Main Methods
- TurboID mass spectrometry was employed to identify novel ST interactors.
- Comparative analysis of δ-catenin expression and interaction in fibroblasts versus virus-positive MCC cell lines.
- Investigation of δ-catenin's role in cell cycle regulation and its interaction with Kaiso.
- Analysis of LSD1's role in regulating δ-catenin isoform 3 expression via ESRP1.
Main Results
- δ-Catenin was identified as a novel ST interactor in fibroblasts, but this interaction is absent in VP-MCC cells.
- δ-Catenin is crucial for VP-MCC proliferation, with distinct isoforms (1 in fibroblasts, 3 in VP-MCC) playing differential roles.
- δ-Catenin promotes VP-MCC proliferation via Kaiso-mediated regulation of cell cycle genes.
- LSD1 regulates δ-catenin isoform 3 expression by modulating the splicing factor ESRP1.
Conclusions
- The cell supporting MCPyV replication (fibroblasts) may be distinct from the cell of origin for MCC.
- δ-Catenin isoform 3 is essential for VP-MCC proliferation, highlighting its role in tumorigenesis.
- Novel host factors and regulatory pathways involving δ-catenin, Kaiso, and LSD1 are implicated in MCC pathogenesis.
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