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. 1970 Apr;65(4):876–883. doi: 10.1073/pnas.65.4.876

Pulse Labeling of RNA of Mammalian Cells*

Giovanni Rovera 1, Stephen Berman 1, Renato Baserga 1
PMCID: PMC282998  PMID: 5266157

Abstract

When cells from a hypotetraploid strain of Ehrlich ascites tumor are exposed to uridine-3H either in vivo or in vitro, the amount of radioactivity incorporated into RNA reaches a maximum within ten minutes, after which any further incorporation stops. 3H-uridine triphosphate disappears from the acid soluble pool within 30 minutes and the findings indicate that the RNA of these cells can be pulse labeled without the use of any antibiotic or the need of a „chase.” The stability of the pulse labeled RNA in the presence of pentobarbital (an inhibitor of RNA synthesis) indicates the virtual absence of RNA breakdown. However, actinomycin D, at a dosage of 250 μg/mouse in vivo and 10 μg/ml in vitro produces breakdown of labeled RNA, thus confirming earlier observations that the drug is not a suitable tool for RNA kinetics determinations. The pulse-labeled RNA leaves the nucleus slowly and some radioactive RNA is still present in the nuclear fraction after 24 hours. Radioactivity begins to appear in cytoplasmic ribosomal RNA after 20 minutes and continues to increase up to six hours.

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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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