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. 1961 Jan 1;9(1):81–91. doi: 10.1083/jcb.9.1.81

A STUDY OF THE PENETRATION OF MAMMALIAN CELLS BY DEOXYRIBONUCLEIC ACIDS

Ellen Borenfreund 1, Aaron Bendich 1
PMCID: PMC2224982  PMID: 19866579

Abstract

Tritium-labeled deoxyribonucleic acid (DNA) from pneumococci and from human leukocytes was added to growing cultures of HeLa cells at 37°C. Autoradiography revealed an extensive localization of tritium in the nuclear regions. The label could not be removed by treatment with ribonuclease or dilute perchloric acid, but quantitative removal from the cells could be effected with deoxyribonuclease. Chemical and radioactivity determinations on nucleic acids isolated from the exposed HeLa cells revealed the presence of tritium in all 4 DNA bases. About 12 µg. of tritiated DNA was recovered from 6 x 106 HeLa cells which had been exposed for 24 hours to 240 µg. of the human DNA. From this, it is concluded that the amount of DNA, or its degradation products, taken up by the cells was equivalent to at least 10 per cent of the normal HeLa cell complement.

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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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