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Application of an improved methodology to demonstrate bacterial adherence during the menstrual cycle

Bakterielle Adhärenz an Uroepithelzellen während des Menstruationszyklus

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Summary

We studied bacterial adherence to uroepithelial cells of female patients in relation to the menstrual cycle. We determined the number of bacteria demonstrable on native cells and the number of adhering bacteria after incubation withE. coli. Free bacteria and uroepithelial cells with adhering bacteria were optimally separated by differential centrifugation using sodium metrizoate (9.6%) and dextran (5.6%) (Lymphoprep). Thus, contamination of the cell preparation by free (non-adhering) bacteria was avoided and results were well reproducible.

A median of five bacteria/cell (range 0–19) was observed for uroepithelial cells obtained from urine of female patients. Such bacteria were mostly rods.

After in vitro incubation withE. coli cultures, a median of 33 bacteria/cell (range 17–54) was counted.

Our improved methodology failed to demonstrate a relationship between bacterial adhesion and the menstrual cycle.

Zusammenfassung

Die bakterielle Haftfähigkeit an Uroepithelien weiblicher Probandinnen wurde in Abhängigkeit vom Menstrualzyklus überprüft. Untersucht wurden die Zahl der an nativ gewonnenen Zellen nachweisbaren Bakterien und die Zahl der nach Inkubation mitE. coli-Kulturen haftenden Bakterien. Eine optimale Trennung zwischen Bakterien und Epithelzellen mit anhaftenden Bakterien wurde erreicht durch Differential-Zentrifugation mit Hilfe von Natrium-Metrizoat (9,6%) und Dextran (5,6%) (Lymphoprep). Dieser Schritt gestattet, die Kontamination des Präparates durch nichthaftende Bakterien zu vermeiden und gewährleistet gute Reproduzierbarkeit.

An nativen Uroepithelzellen wurde ein Median von fünf Bakterien/Zelle (Spannbreite 0–19) ermittelt. Die haftenden Bakterien waren in der Regel Stäbchen.

Nach in vitro-Inkubation mit Bakterien-Kulturen wurden im Schnitt 33 Bakterien/Zelle (Spannbreite 17–54) ermittelt.

Mit der verbesserten Methode zeigte sich keine Abhängigkeit der bakteriellen Haftfähigkeit vom Menstrualzyklus.

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Supported by the Deutsche Forschungsgemeinschaft Ri 347/1

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Riedasch, G., Landis, E. & Ritz, E. Application of an improved methodology to demonstrate bacterial adherence during the menstrual cycle. Klin Wochenschr 59, 905–908 (1981). https://doi.org/10.1007/BF01721924

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  • DOI: https://doi.org/10.1007/BF01721924

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