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. 1987 Oct;61(10):3058–3065. doi: 10.1128/jvi.61.10.3058-3065.1987

Transforming and mitogenic effects of avian leukemia virus E26 on chicken hematopoietic cells and fibroblasts, respectively, correlate with level of expression of the provirus.

P Jurdic, M Benchaibi, O Gandrillon, J Samarut
PMCID: PMC255880  PMID: 3041027

Abstract

We have investigated the effect of E26, an avian leukemia retrovirus, on the growth properties of chicken embryo fibroblasts (CEFs). E26-infected CEFs were not transformed, according to several transformation parameters, but exhibited an activated growth in vitro. They started to grow without latency in serum-supplemented medium, maintained long-term growth in regular or low-serum medium, and could grow when seeded at low cell density in low-serum medium. We compared the integration and the level of expression of the proviral DNA in E26-infected CEFs and E26-transformed hematopoietic cells. An average of two provirus copies were found in each kind of cells. However, whereas high contents of both viral mRNA and E26-specific protein products were found in transformed hematopoietic cells, we detected only low amounts of viral mRNA and no E26 protein in infected CEFs. These data show that the level of expression of the E26 provirus is lower in CEFs than in hematopoietic cells. They suggest that transformation efficiency of the virus depends on its level of expression.

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Selected References

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