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. 1979 Jun 25;6(8):2863–2877. doi: 10.1093/nar/6.8.2863

Effects of ethidium bromide on the production of ribosomal RNA in cultured mouse cells.

M Lange, P May
PMCID: PMC327899  PMID: 88722

Abstract

A treatment of primary mouse kidney cell cultures with 5 microM Ethidium Bromide (Eth Br) reduces the transcription of nuclear-coded genes and especially of ribosomal RNA genes. This effect was consistently observed when comparing drug-treated and control cells for (i), the incorporation of 3H uridine into total nuclear and B RNA polymerases as determined in isolated nuclei. It became more pronounced with exposure time; however, after removal of the drug, there was a progressive recovery of RNA synthesis culminating in the complete reversal of the drug effect. That this effect is probably not due only to the suppression of mitochondrial protein synthesis by the drug, is shown by a comparative study of the effects of chloramphenicol treatment. In addition, in the cytoplasm Eth Br depresses the labeling of 28 S rRNA more than that of 18 S whereas no abnormal accumulation of 28 S rRNA is observed in the nucleus. It is suggested that Eth Br may affect either the stability of the 28 S rRNA or its rate of formation from the 32 S precursor.

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Selected References

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