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. 1992 Mar;66(3):1449–1457. doi: 10.1128/jvi.66.3.1449-1457.1992

Highly efficient focus formation by Rous sarcoma virus on adenovirus type 12 E1A-transformed rat 3Y1 cells.

K Shiroki 1, M Hamaguchi 1, S Kawai 1
PMCID: PMC240869  PMID: 1310757

Abstract

When rat 3Y1 cells were infected with Rous sarcoma virus (RSV) variant SR-RSV-D(H), many 3Y1 cells acquired a stable provirus but only few of them formed transformed foci. In contrast, 12E1AY cells (3Y1 cells expressing the adenovirus type 12 [Ad12] E1A protein) formed transformed foci upon RSV infection with the same high frequency as did chicken embryo fibroblast cells. This enhancement of focus-forming efficiency was specifically observed in 3Y1 cells expressing Ad12 E1A protein but was not observed in 3Y1 cells expressing simian virus 40 T, c-myc, p53, c-fos, or v-fos protein. This enhancement was not evident in 5E1AY cells (3Y1 cells expressing the Ad5 E1A protein). Judging from the experiment using Ad12-Ad5 hybird E1A DNAs, the N-terminal half of the Ad12 E1A protein was responsible for this enhancement. The promoter activity of the RSV long terminal repeat measured by pLTR-CAT did not correlate to the efficiency of focus formation by RSV in these 3Y1 cells. Moreover, RSV containing the neo gene instead of the src gene produced G418-resistant cells equally efficiently among 3Y1, E1AY, and chicken embryo fibroblast cells. These results suggest that the enhancement of focus formation by RSV is not due to the increased expression of the src gene by the E1A protein. src mRNA and src protein were lower in RSV-transformed E1AY (RSVE1AY) cells than in RSV-transformed 3Y1 (RSV3Y1) cells. The phosphotyrosine-containing proteins were also less abundant in RSVE1AY cells than in RSV3Y1 cells, suggesting that E1AY cells require a lower threshold dose of p60v-src for transformation than do 3Y1 cells. E1AY cells were found to be more sensitive to lysis by detergents. The results suggest that the enhancement is due to changes in membrane structures in E1AY cells.

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Selected References

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