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

Open Access 01-12-2015 | Research

Quantitative morphological changes in the interplacentomal wall of the gravid uterine horn of cattle during pregnancy

Authors: Rose M Albers, Anke Schnapper, Martin Beyerbach, Alois Boos

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

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Abstract

Background

The interplacentomal wall of the gravid uterine horn in cattle is the subject of reports dealing mainly with specific aspects of early pregnancy or the peripartal period. Only a very limited number of early and descriptive studies includes the whole period of pregnancy. Thus, there is a gap concerning quantitative morphological data of the uterine wall during pregnancy. We hypothesized that the specific requirements of pregnancy are reflected by significant and characteristic morphologic changes.

Methods

Interplacentomal segments of the fetus-bearing horn of the uterus of 47 cows were collected at slaughter, assessed quantitatively by light microscopy, grouped into trimesters (trim), and data were analyzed statistically.

Results

During pregnancy there were significant increases (p<0.05) in the measured parameters: heights of the endometrial surface epithelium (31 increased to 46 and 46 μm, in the 1st, 2nd and 3rd trim, respectively), glandular epithelium (19.6 to 22.4 and 25.4 μm, respectively), diameters of glands (94 to 166 to 239 μm, respectively) and glandular lumina (56 to 122 to 188 μm, respectively). Volume density of the glandular epithelium did not change, while that of glandular lumina increased significantly (8 to 26 to 40% in the 1st, 2nd and 3rd trim, respectively) and of endometrial stroma decreased with ongoing pregnancy (67 to 46 to 37%; p<0.05).
Diameters of myometrial smooth muscle cells (MSMC) (9.7 to 12.4 and 12.9 μm, respectively, for the 1st, 2nd and 3rd trim; p<0.05), and the volume fraction of myometrial stroma increased (6 to 10 to 13%; p<0.05), while decreases were observed in MSMC nuclear volume density (4.4 and 4.0 to 2.4%; p<0.05). The fraction of MSMC cytoplasm (89 to 85%) and the nucleus:cytoplasm ratio (0.05 to 0.03%) both decreased for the 1st vs. 3rd trim, respectively (p<0.05).

Conclusions

These results indicate that the interplacentomal wall of the gravid uterine horn is subjected to significant morphological changes during pregnancy, underlining the importance of endometrial surface epithelium and of gland hypertrophy for nourishment of the conceptus, of increased myometrial extracellular matrix for uterine tensile strength and of myometrial smooth muscle hypertrophy for expulsion of the fetus at term.
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Metadata
Title
Quantitative morphological changes in the interplacentomal wall of the gravid uterine horn of cattle during pregnancy
Authors
Rose M Albers
Anke Schnapper
Martin Beyerbach
Alois Boos
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/s12958-015-0030-3

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