MmuPV1-Induced Cutaneous Squamous Cell Carcinoma Arises Preferentially from Lgr5+ Epithelial Progenitor Cells
Overview
Authors
Affiliations
Murine papillomavirus, MmuPV1, causes natural infections in laboratory mice that can progress to squamous cell carcinoma (SCC) making it a useful preclinical model to study the role of papillomaviruses in cancer. Papillomavirus can infect cells within hair follicles, which contain multiple epithelial progenitor cell populations, including Lgr5+ progenitors, and transgenic mice expressing human papillomavirus oncogenes develop tumors derived from Lgr5 progenitors. We therefore tested the hypothesis that Lgr5+ progenitors contribute to neoplastic lesions arising in skins infected with MmuPV1 by performing lineage tracing experiments. Ears of 6-8-week-old Lgr5-eGFP-IRES-CreERT2/Rosa26LSLtdTomato mice were treated topically with 4-OH Tamoxifen to label Lgr5+ progenitor cells and their progeny with tdTomato and, 72 h later, infected with MmuPV1. Four months post-infection, tissue at the infection site was harvested for histopathological analysis and immunofluorescence to determine the percentage of tdTomato+ cells within the epithelial lesions caused by MmuPV1. Squamous cell dysplasia showed a low percentage of tdTomato+ cells (7%), indicating that it arises primarily from non-Lgr5 progenitor cells. In contrast, cutaneous SCC (cSCC) was substantially more positive for tdTomato+ cells (42%), indicating that cSCCs preferentially arise from Lgr5+ progenitors. Biomarker analyses of dysplasia vs. cSCC revealed further differences consistent with cSCC arising from LGR5+ progenitor cells.
Bravo I, Belkhir S, Paget-Bailly P FEMS Microbiol Rev. 2024; 48(6).
PMID: 39562287 PMC: 11644485. DOI: 10.1093/femsre/fuae029.
Sanders C, Matthews R, Esfahani S, Khan N, Patel N, Kalen J Vaccine. 2023; 41(31):4480-4487.
PMID: 37270364 PMC: 10527091. DOI: 10.1016/j.vaccine.2023.05.057.
Special Issue "New Frontiers in Small DNA Virus Research".
Strati K, Pyeon D Viruses. 2023; 15(1).
PMID: 36680299 PMC: 9865906. DOI: 10.3390/v15010259.