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Biochemische Untersuchungen zur Frage der Hypotrophie und Hypoplasie im postpartalen Rattenuterus

Biochemical studies on hypotrophy and hypoplasia in the post partum uterus of the rat

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Summary

In post partum rat uteri, the wet weight, the soluble protein and the DNA content were measured for ten days following delivery. After a lag period of 48 h, the weight and protein content of whole uteri decreased in parallel to one twelfth of the initial values. The DNA content did not change significantly. Hypoplasia contributed not more than 20% to the weight loss, so that at least 80% of the loss was due to hypotrophy. The protein content per cell nucleus (mg protein/mg DNA) decreased by 85% within 10 days.

In non-pregnant control animals, uterus weight and protein content per cell nucleus were greater than those of animals measured on the tenth post partum day. In contrast, the protein concentration of the tissue (mg protein/g wet weight) was lower in the control group. It is suggested that this hyperinvolution is caused by the low estrogen levels of the lactating animals.

Zusammenfassung

Beim postpartalen Rattenuterus wurden während 10 Tagen nach dem Wurf Uterusgewicht, lösliches Protein und DNS gemessen. Uterusgewicht und Proteingehalt des Gesamtuterus fielen nach einer Latenz von 48 Std in ähnlichem Verlauf auf 1/12 des Ausgangswertes ab, während der DNS-Gehalt sich nicht signifikant änderte. Der Anteil der Hypoplasie an der Gewichtsreduktion betrug maximal 20%, während mindestens 80% des Gewebeschwundes durch Hypotrophie zustande kamen. Die Proteinmenge pro Zellkern (mg Protein/mg DNS) fiel innerhalb von 10 Tagen um 85% ab.

Bei nicht trächtigen Vergleichstieren lagen Uterusgewicht und Proteinmenge pro Zellkern über den entsprechenden Werten bei Tieren am 10. Tag post partum. Die Proteinkonzentration des Gewebes (mg Protein/g Feuchtgewicht) war dagegen niedriger. Diese Hyperinvolution am 10. Tag wird als Folge des gegenüber Normaltieren niedrigeren Östrogenspiegels der lactierenden Tiere erklärt.

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Wesentliche Teile dieser Untersuchung stammen aus der Dissertation von U. Müller

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Geyer, H., Afting, E.G. & Müller, U. Biochemische Untersuchungen zur Frage der Hypotrophie und Hypoplasie im postpartalen Rattenuterus. Arch. Gynak. 222, 231–238 (1977). https://doi.org/10.1007/BF00717600

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