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Induction of infectious virus DNA and virus particles by mitomycin C in SV40-transformed mouse cells
Abstract:
A line of SV40-transformed mouse cells (SV/3T3-4E) was isolated and four clones were derived from this line. Spontaneous production of small amounts of infectious SV40 DNA was detected in the parental line and in three out of the four clones tested, although no synthesis of virions could be demonstrated. The yields of SV40 DNA were significantly enhanced following treatment of these cells with mitomycin C and infectious virus particles became detectable occasionally.
Insights
SV40-transformed mouse cells spontaneously produced infectious Simian virus 40 (SV40) DNA. Mitomycin C treatment enhanced SV40 DNA yields and occasionally produced infectious virus particles in these cells.
Area of Science:
- * Molecular biology
- * Virology
- * Cell biology
Background:
- * SV40-transformed cell lines are valuable tools for studying viral replication and oncogenesis.
- * Understanding the mechanisms of latent virus production is crucial for virology research.
Purpose of the Study:
- * To investigate the spontaneous production of infectious SV40 DNA in a specific mouse cell line (SV/3T3-4E) and its clones.
- * To determine if mitomycin C treatment can induce or enhance SV40 replication in these cells.
Main Methods:
- * Isolation and cloning of SV40-transformed mouse cells (SV/3T3-4E).
- * Detection of infectious SV40 DNA in parental and cloned cell lines.
- * Treatment of cells with mitomycin C to assess its effect on viral DNA and particle production.
Main Results:
- * Spontaneous production of infectious SV40 DNA was observed in the parental SV/3T3-4E cell line and three of four derived clones.
- * No infectious virions were detected in untreated cells, indicating a non-productive infection or DNA replication without assembly.
- * Mitomycin C treatment significantly enhanced SV40 DNA yields and led to the occasional detection of infectious virus particles.
Conclusions:
- * SV/3T3-4E cells harbor a latent form of SV40 capable of producing infectious DNA.
- * Mitomycin C acts as an inducer, promoting viral DNA replication and particle formation in these transformed cells.
- * This model system provides insights into SV40 reactivation and the study of DNA tumor viruses.