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A Syngeneic Murine Model of Endometriosis using Naturally Cycling Mice
Published on: November 24, 2020
The equine endometrosis: new insights into the pathogenesis
Christine Hoffmann1, Christin Ellenberger, Rodrigo Costa Mattos
1Institute of Pathology, University of Leipzig, Germany. christine.hoffmann@fli.bund.de
Animal Reproduction Science
|May 13, 2008
Summary
Equine endometrosis, a fibrotic uterine disease, presents in destructive and non-destructive forms. Fibrotic cells dedifferentiate, losing hormone receptor expression, suggesting independence from hormonal control.
Area of Science:
- Veterinary Pathology
- Reproductive Biology
Background:
- Endometrosis is a common cause of infertility in mares.
- Understanding its pathogenesis is crucial for improving reproductive outcomes.
Purpose of the Study:
- To histomorphologically and immunohistochemically characterize equine endometrosis.
- To investigate potential etiological factors influencing disease progression.
Main Methods:
- Examination of 779 endometrial biopsies using histopathology, alcian blue staining, and immunohistochemistry.
- Analysis of markers including steroid hormone receptors, Ki-67, vimentin, desmin, fibronectin, smooth-muscle-alpha-actin, and laminin.
- Biopsies collected during different seasons, estrous cycle days, and following induced endometritis.
Main Results:
- Equine endometrosis classified into destructive and non-destructive forms, with active/inactive states in fibrotic foci.
- Fibrotic stromal cells exhibit reduced steroid hormone receptor expression, indicating dedifferentiation and potential independence from hormonal control.
- Destructive endometrosis features myofibroblasts, epithelial vimentin expression, extracellular matrix accumulation, and basal lamina alterations, potentially causing gland destruction via contractibility.
Conclusions:
- Equine endometrosis represents stages of a fibrotic process leading to gland destruction and stromal fibrosis.
- While endometritis can temporarily activate fibrotic cells, cyclic/seasonal endocrine changes do not appear to affect disease progression.
- Dedifferentiated fibrotic cells in endometrosis are largely independent of uterine hormonal control mechanisms.
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