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Updated: Aug 25, 2026

Paramyxoviruses for Tumor-targeted Immunomodulation: Design and Evaluation Ex Vivo
Published on: January 7, 2019
[The paradox of polyomaviruses. Lytic infection or tumor induction?]
1Laboratorio de Patología Experimental, Departamento de Microbiología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, 1121 Buenos Aires, Argentina. patoexpe@fmed.uba.ar
Abstract:
Murine polyomaviruses can produce lytic infections in mouse cell cultures or transform in vitro rat fibroblasts through a complex interaction with key cellular regulators. After infection of newborn mice, some strains of polyomavirus induce epithelial and mesenchymal tumors. It has been described that there is a direct relationship between viral dissemination in the mouse and tumor induction. However, at a single cell level lytic infection and transformation would not be able to coexist. The existence of 3 distinct cell populations in polyoma-induced tumors, classified according to the presence or absence of viral DNA and viral capsid protein VP-1 have been described. We have reported a fourth type of cell in the neoplasms, that can express the early and the late viral genes but do not allow virus assembly, probably due to underphosphorylation of VP-1. The mechanisms of polyoma intracellular migration and dissemination in the mouse are discussed, related to the virus' ability of tumor induction.
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