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Proportionalitätsfehler bei der Feulgen-Hydrolyse

Proportionality errors during feulgen hydrolysis

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Summary

Comparing the Feulgen dye-content of different nuclei (liver cells, lymphocytes, granulocytes and sperms) after alcohol-fixation deviations were found between the measured Feulgen values and the DNA-content to be expected from the DNA-constancy law. The Feulgen values of lymphocytes and granulocytes proved to be lower (up to minus 20%) than those of diploid liver nuclei at all hydrolysis times, while in the postmaximal range of hydrolysis the values of the haploid sperms were too high (even higher than those of the diploid nuclei). Such differences did not appear when nuclei of the same cell type in different DNA- ploidy classes (liver nuclei) were compared.

Those deviations of leucocytes and sperms were no longer found after fixation in methanol-formalin-glacial acetic acid and, in addition, could not be confirmed by UV-absorption measurements. For that reason we suppose them to be due to proportionality errors caused by variations in the hydrolytic behaviour of the different nucleoproteins.

Thus fixation in methanol-formalin-glacial acetic acid seems to be more suitable for quantitative Feulgen measurements than alcohol-fixation, which may easily give rise to proportionality errors during Feulgen hydrolysis.

Moreover, to avoid any false interpretation of Feulgen data we should suggest controll measurements using another independent method (f. e. UV-absorption), or — if this is impossible — to check the Feulgen values after different fixations and variant hydrolysis times (premaximal, maximal, postmaximal).

Zusammenfassung

Beim Vergleich des Feulgen-Farbgehaltes verschiedener Zellkerne (Leberzellen, Lymphozyten, Granulozyten und Spermien) traten nach Alkoholfixierung Abweichungen der gemessenen Feulgen-Werte von den nach dem Gesetz von der DNS- Konstanz zu erwartenden DNS-Gehalt dieser Kerne auf. Verglichen mit den Feulgen-Werten der diploiden Leberzellkerne ergaben Lympho- und Granulozyten bei allen Hydrolysezeiten zu niedrige (bis zu minus 20%), haploide Spermien im postmaximalen Hydrolysebereich zu hohe Feulgen-Werte (z. T. sogar höhere Werte als die diploiden Zellkerne). Innerhalb desselben Zelltypes wurden dagegen, auch beim Vergleich der verschiedenen Ploidiestufen der Leberkerne, keine Differenzen festgestellt.

Da die an Leukozyten und Spermien beobachteten Abweichungen nach Methanol-Formalin-Eisessig-Fixierung nicht mehr auftraten und auch durch UV-absorptionscytophotometrische Messungen nicht bestätigt werden konnten, muß man annehmen, daß es sich um Proportionalitätsfehler handelt, die auf Hydrolyseunterschieden beruhen.

Für die quantitative Feulgen-Cytophotometrie scheint daher die Methanol-Formalin-Eisessig-Fixierung besser geeignet zu sein als die Alkoholfixierung, bei deren Verwendung es leicht zu Proportionalitätsfehlern während der Feulgen-Hydrolyse kommen kann.

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Authors and Affiliations

  1. Pathologisches Institut der Universität, Freiburg

    N. Böhm, E. Sprenger, G. Schlüter & W. Sandritter

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  1. N. Böhm
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  2. E. Sprenger
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  3. G. Schlüter
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  4. W. Sandritter
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Böhm, N., Sprenger, E., Schlüter, G. et al. Proportionalitätsfehler bei der Feulgen-Hydrolyse. Histochemie 15, 194–203 (1968). https://doi.org/10.1007/BF00305883

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  • DOI: https://doi.org/10.1007/BF00305883

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