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Ethidium bromide: a nucleic acid stain for tissue section

WA Franklin and JD Locker

The phenanthridinium dye, ethidium bromide (EB), selectively intercalates into double-stranded regions of nucleic acids with a large and specific increase in fluorescence. When used for the staining of fixed tissue sections, the dye stains cellular nuclei with excellent resolution of microscopic detail. In some fixed tissues, particularly pancreatic acini, cytoplasm stains intensely and this staining can be abolished by digestion with trypsin and ribonuclease. The orange fluorescence of EB can be easily distinguished from the green fluorescence of fluorescein and EB is thus an excellent counterstain for immunofluorescence. Ethidium bromide is a useful and practical stain for the fluorescence microscopy of tissue sections and, in combination with enzymatic digestion of RNA, provides a simple way to differentially localize DNA and RNA.

Volume 29, Issue 4, pp. 572-576, 04/01/1981
Copyright © 1981 by The Histochemical Society


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The Journal of Histochemistry & Cytochemistry is owned, published, and licensed by The Histochemical Society © 1981