TY - JOUR
T1 - Sensitiztion of transformed rat fibroblasts to killing by parvovirus minute virus of mice correlates with an increase in viral gene expression
AU - Cornelis, J. J.
AU - Spruyt, N.
AU - Spegelaere, P.
AU - Guetta, E.
AU - Darawshi, T.
AU - Cotmore, S. F.
AU - Tal, J.
AU - Rommelaere, J.
PY - 1988/1/1
Y1 - 1988/1/1
N2 - 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 report 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.
AB - 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 report 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.
UR - http://www.scopus.com/inward/record.url?scp=0023820680&partnerID=8YFLogxK
U2 - 10.1128/jvi.62.9.3438-3444.1988
DO - 10.1128/jvi.62.9.3438-3444.1988
M3 - Article
C2 - 3404581
AN - SCOPUS:0023820680
SN - 0022-538X
VL - 62
SP - 3438
EP - 3444
JO - Journal of Virology
JF - Journal of Virology
IS - 9
ER -