Summary
Feulgen nuclear staining with pararosanilin-SO2 was combined with the ninhydrin-Schiff technique. The aldehyde groups converted from primary amino groups are stained with an acriflavine-Schiff reaction. This results in a red nuclear fluorescence and a bright yellow cytoplasmic and nuclear fluorescence. The combined fluorescence staining facilitates cytofluorometric determination of total protein and DNA in the same cell.
The ninhydrin-Schiff reaction is affected by the fixation procedure and the duration of the ninhydrin reaction. Investigations with a model system showed that proportionality beween the fluorescence intensity of acriflavine and the amount of protein stained by the procedure was obtained after fixation with a fixation mixture suggested by Böhm et al. (1968) and a reaction with ninhydrin at 37° C for 10 h.
The ninhydrin-Schiff reaction has no effect on the fluorescence intensity of cells previously treated with pararosanilin-Feulgen staining and it is not affected itself by this previous procedure.
Testing this double fluorescence staining on cytology specimens taken from patients with gastric carcinoma and uterine cervial carcinoma, cancer cells were shown to have markedly increased protein and DNA contents compared with those of normal cells.
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Partly supported by Deutsche Forschungsgemeinschaft (DFG), grant Nr. Bo 395/4
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Fukuda, M., Nakanishi, K., Böhm, N. et al. Combined protein and DNA measurements by the ninhydrin-Schiff and Feulgen techniques. Histochemistry 63, 35–45 (1979). https://doi.org/10.1007/BF00508010
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DOI: https://doi.org/10.1007/BF00508010