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. 1970 Nov;67(3):1256–1263. doi: 10.1073/pnas.67.3.1256

Overgrowth-Stimulating Activity of Disrupted Chick Embryo Cells and Cells Infected with Rous Sarcoma Virus

H Rubin 1,2
PMCID: PMC283345  PMID: 4320975

Abstract

Sonically disrupted chick embryo cells markedly stimulate DNA synthesis and cell multiplication when added to the medium of population density-inhibited cultures of such cells, but have little effect on the growth rate of sparse cultures. Sonicates from density-inhibited chick embryo cultures have as much overgrowth-stimulating activity as do sonicates from actively growing cells. Sonicates from cells infected with Rous sarcoma virus show markedly increased overgrowth-stimulating activity 4 days after infection. The activity in Rous-cell sonicates falls back to near normal amounts at 6 days concurrently with the appearance of a high content of overgrowth-stimulating activity in the medium. The active material is nondialyzable. It seems that growth-inhibited cells contain material in a sequestered location which, when released, can stimulate rapid growth in similarly inhibited cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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