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Embryo implantation and proteinase activities in a marsupial (Macropus eugenii)

Histochemical patterns of proteinases in various gestational stages

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Summary

Embryo implantation remains superficial (epithelio-chorial type) in most marsupials including the Macropodidae, but does involve formation of specialized contact zones of the trophoblast with the uterine epithelium. Since in eutherian mammals proteinases appear to play a central role in implantation-initiation mechanisms, a systematic histochemical investigation of proteinase patterns as related to implantation was performed in the tammar wallaby, Macropus eugenii (Macropodidae).

Tammar uteri with embryos were collected at diapause and at days 7, 17, 18, 19, 20, 21 and 26 of the 27-day gestational period. Proteinase patterns were studied using a sensitive histochemical gelatin-substrate-film test previously optimized for the detection of trophoblast-dependent proteinase (blastolemmase) in the rabbit. Proteinase patterns were correlated with light-microscopical morphology of the processes of shedding of the extracellular embryo coverings (shell membrane) and attachment of the trophoblast to the uterine epithelium.

At acid pH values an intracellular proteinase is detected in yolk sac endoderm and trophoblast as well as in endometrial glands and certain stromal cells. This enzyme is proposed to be a cathepsin indicating high catabolic activity connected particularly with protein transport from the endometrium into the yolk sac. Peak activity is found in the avascular (bilaminar) yolk sac at the phase when contact with the endometrium is being established.

A particularly interesting proteinase active at alkaline pH values is detected in the trophoblast-endoderm complex. This enzyme appears to be extruded into the interface between trophoblast and uterine epithelium where it shows maximal activity for only approximately one day, around day (18-)19, exclusively in the bilaminar (avascular) yolk sac. The activity is correlated with the process of shedding of the extracellular embryo coverings (shell membrane) and of subsequent attachment of the trophoblast to the uterine epithelium, in the bilaminar but not the trilaminar (vascular) yolk-sac region. This is the first report on an extracellular (alkaline) proteinase activity possibly serving a specific function in embryo implantation in a marsupial.

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Abbreviations

BYS :

bilaminar (avascular) yolk sac membrane = bilaminar omphalopleure

dp.c. :

days post coitum

d RPY :

days after removal of pouch young

TYS :

trilaminar (vascular) yolk sac membrane = trilaminar omphalopleure

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Authors and Affiliations

  1. Abteilung Anatomie der RWTH, Aachen, Germany

    H. -W. Denker

  2. CSIRO Division of Wildlife Research, Canberra, Australia

    C. H. Tyndale-Biscoe

Authors
  1. H. -W. Denker
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  2. C. H. Tyndale-Biscoe
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Additional information

Preliminary reports on portions of these investigations were presented at the 14th Annual Meeting of the Society for the Study of Reproduction 1981 (Biol Reprod 24 Suppl 1, p 78 A, 1981) and at the 3. Arbeitstagung der Anatomischen Gesellschaft 1982 (Anat Anz 153, 268, 1983)

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Denker, H.W., Tyndale-Biscoe, C.H. Embryo implantation and proteinase activities in a marsupial (Macropus eugenii). Cell Tissue Res. 246, 279–291 (1986). https://doi.org/10.1007/BF00215890

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  • DOI: https://doi.org/10.1007/BF00215890

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