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Reproductive Biology and Endocrinology
Published in: Reproductive Biology and Endocrinology 1/2015

Open Access 01-12-2015 | Research

In vitro decidualisation of canine uterine stromal cells

Authors: Ewa Kautz, Paula de Carvalho Papa, Iris M. Reichler, Aykut Gram, Alois Boos, Mariusz P. Kowalewski

Published in: Reproductive Biology and Endocrinology | Issue 1/2015

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Abstract

Background

The uterine response to the presence of embryos is poorly understood in the domestic dog (Canis familiaris). The intimate embryo-maternal cross-talk, which begins following the hatching of blastocysts and embryo attachment leads to strong structural and functional remodelling of the uterus. A part of this process is decidualisation, comprising morphological and biochemical changes that result in formation of maternal stroma-derived decidual cells. These are an integral part of the canine placenta materna, which together with the maternal vascular endothelium are the only cells of the canine endotheliochorial placenta able to resist trophoblast invasion. These cells are also the only ones within the canine placenta expressing the progesterone receptor (PGR). Understanding the decidualisation process thus appears essential for understanding canine reproductive physiology.

Methods

Here, we investigated the capability of canine uterine stromal cells to decidualise in vitro, thereby serving as a canine model of decidualisation. A dbcAMP-mediated approach was chosen during a time course of 24 - 72 h. Tissue material from six (n = 6) healthy, dioestric bitches was used (approximately 2 weeks after ovulation). Cells were characterized by differential staining, nearly 100 % of which were vimentin-positive. Scanning and transmission electron microscope analyses were applied, and morphological changes were recorded with a live cell imaging microscope. Expression of several decidualisation markers was investigated.

Results

The in vitro cultured stromal cells acquired characteristics of decidual cells when incubated with 0.5 mM dbcAMP for 72 h. Their shape changed from elongated to rounded, while ultrastructural analysis revealed higher numbers of mitochondria and secretory follicles, and an increased proliferation rate. Elevated expression levels of IGF1, IGF2, PRLR and ERα were observed in decidualised cells; PRL and ERβ remained mostly below the detection limit, while PGR remained unaffected. The expression of smooth muscle α actin (αSMA), another decidualisation marker, was strongly induced. Among prostaglandin system members, levels of COX2 (PTGS2) and of PGE2-synthase (PTGES) were upregulated. Expression of the PGE2 receptors, PTGER2 and PTGER4, was clearly detectable.

Conclusion

An in vitro decidualisation model with canine uterine stromal cells was successfully established, allowing future, more detailed studies to be undertaken on the underlying molecular and endocrine mechanisms of canine decidualisation.
Appendix
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Metadata
Title
In vitro decidualisation of canine uterine stromal cells
Authors
Ewa Kautz
Paula de Carvalho Papa
Iris M. Reichler
Aykut Gram
Alois Boos
Mariusz P. Kowalewski
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Reproductive Biology and Endocrinology / Issue 1/2015
Electronic ISSN: 1477-7827
DOI
https://doi.org/10.1186/s12958-015-0066-4

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