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. 1988 Sep;62(9):3438–3444. doi: 10.1128/jvi.62.9.3438-3444.1988

Sensitization of transformed rat fibroblasts to killing by parvovirus minute virus of mice correlates with an increase in viral gene expression.

J J Cornelis 1, N Spruyt 1, P Spegelaere 1, E Guetta 1, T Darawshi 1, S F Cotmore 1, J Tal 1, J Rommelaere 1
PMCID: PMC253468  PMID: 3404581

Abstract

Cultures of established rat fibroblasts transformed by the avian erythroblastosis virus were more susceptible to the cytopathic effect of the autonomous parvovirus minute virus of mice, prototype strain (MVMp), than were their untransformed homologs. This effect could be ascribed to the presence of a greater fraction of cells that were sensitive to the killing action of MVMp in transformed cultures than in their normal parents. Yet, transformed and normal lines were similarly efficient in virus uptake, DNA amplification, and capsid protein synthesis. In contrast, transformants accumulated 2.5- to 3-fold greater amounts of all three major MVM mRNA species and nonstructural protein than did their normal progenitors. Thus, in this system transformation-associated sensitization of cells to MVMp appears to correlate primarily with an increase in their capacity for the expression of the viral transcription unit which encodes nonstructural proteins and is controlled by the P4 promoter. Consistently, a reporter gene was expressed at a higher level by transformed versus normal cultures, when placed under the control of the MVM P4 promoter. As infectious MVMp was produced in larger amounts by transformed cultures, a late step of the parvoviral cycle, such as synthesis, encapsidation of progeny DNA, or both, was also stimulated in the transformed cells.

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Selected References

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