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Updated: May 28, 2025
Merkel Cell Polyomavirus Infection and Detection
Published on: February 7, 2019
Integrative analysis reveals therapeutic potential of pyrvinium pamoate in Merkel cell carcinoma
Jiawen Yang1, James T Lim2, Paul Victor Santiago Raj3
1University of Arizona Cancer Center, Tucson, Arizona, USA.
Abstract:
Merkel Cell Carcinoma (MCC) is an aggressive neuroendocrine cutaneous malignancy arising from either ultraviolet-induced mutagenesis or Merkel cell polyomavirus (MCPyV) integration. Despite extensive research, our understanding of the molecular mechanisms driving the transition from normal cells to MCC remains limited. To address this knowledge gap, we assessed the impact of inducible MCPyV T antigens on normal human fibroblasts by performing RNA-seq. Our data uncovered changes in expression and regulation of Wnt signaling pathway members. Building on this observation, we bioinformatically evaluated various Wnt pathway perturbagens for their ability to reverse the MCC gene expression signature and identified pyrvinium pamoate, an FDA-approved anthelminthic drug known for its antitumor activity in other cancers. Leveraging transcriptomic, network, and molecular analyses, we found that pyrvinium targets multiple MCC vulnerabilities. Pyrvinium not only reverses the neuroendocrine features of MCC by modulating canonical and noncanonical Wnt signaling but also inhibits cancer cell growth by activating p53-mediated apoptosis, disrupting mitochondrial function, and inducing endoplasmic reticulum stress. Finally, we demonstrated that pyrvinium reduces tumor growth in an MCC mouse xenograft model. These findings offer a deeper understanding of the role of Wnt signaling in MCC and highlight the utility of pyrvinium as a potential treatment for MCC.
Insights
Pyrvinium pamoate, an antihelminthic drug, shows promise for Merkel Cell Carcinoma (MCC) treatment. It reverses cancer features by targeting Wnt signaling and induces cell death, reducing tumor growth in preclinical models.
Area of Science:
- Oncology
- Molecular Biology
- Virology
Background:
- Merkel Cell Carcinoma (MCC) is an aggressive skin cancer with limited treatment options.
- The molecular drivers of MCC, particularly the role of Merkel cell polyomavirus (MCPyV), are not fully understood.
- Wnt signaling pathway dysregulation is implicated in various cancers, but its specific role in MCC requires further investigation.
Purpose of the Study:
- To investigate the molecular mechanisms of MCC development.
- To identify potential therapeutic agents for MCC by targeting Wnt signaling.
- To evaluate the efficacy of pyrvinium pamoate in MCC.
Main Methods:
- RNA sequencing (RNA-seq) analysis of human fibroblasts treated with MCPyV T antigens.
- Bioinformatic evaluation of Wnt pathway modulators.
- Transcriptomic, network, and molecular analyses of pyrvinium pamoate's effects.
- In vivo testing using an MCC mouse xenograft model.
Main Results:
- MCPyV T antigens alter Wnt signaling pathway gene expression in fibroblasts.
- Pyrvinium pamoate was identified as a potential therapeutic agent capable of reversing MCC gene expression signatures.
- Pyrvinium pamoate modulates Wnt signaling, induces apoptosis via p53, disrupts mitochondrial function, and causes endoplasmic reticulum stress.
- Pyrvinium pamoate significantly reduced tumor growth in an MCC mouse xenograft model.
Conclusions:
- Wnt signaling plays a critical role in MCC pathogenesis.
- Pyrvinium pamoate demonstrates significant preclinical efficacy against MCC through multiple mechanisms.
- Pyrvinium pamoate represents a promising therapeutic candidate for Merkel Cell Carcinoma treatment.
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