Equine Endometrial Explants Undergo Significant Degenerative Changes in Culture.

This research study investigates the degenerative changes that occur to equine endometrial explants in a cell culture environment over time. It highlights that cell damage and degenerative changes occur rapidly, within 12 hours, and that these changes are consistent across various cell culture mediums.

Study Objectives and Methodology

• The main purpose of the study was to evaluate the viability and morphological changes to equine endometrial explants following 12, 24, and 48 hours in culture. The viability of these explants was measured indirectly using Lactate Dehydrogenase (LDH) activity in the culture supernatant.
• The researchers compared the effects of six different types of culture media on explant viability and morphology in order to see if the type of medium used affects the rate of degeneration.
• Microscopic evaluation was used to observe and record morphological changes that occurred to the explants during the culture period.
• The gene expression of specific biomarkers of endometrial function and cellular stress, namely PTGS2, ESR1, and VEGF, were also assessed.

Significant Findings

• The study found significant degenerative changes happening in the explants as early as 12 hours after being cultivated, including the almost complete loss of luminal and superficial glandular epithelium and a widespread detachment of deep glandular epithelium after 48 hours.
• There was a marked increase in LDH activity within 12 hours of culturing, indicating cell damage, irrespective of the type of culture medium used.
• The gene expression of endometrial function and cellular stress biomarkers also altered over time. PTGS2 and VEGF expression had a remarkable increase while ESR1 maintained a steady state.

Implications of the Findings

• This research suggests that using this current culture system to study aspects of endometrial function, such as the inflammatory response to insemination, has limitations due to the marked increase in PTGS2 expression.
• Regardless of the type of medium used, the rapid onset of cell degeneration and detachment creates potential issues for the length and continuity of such studies.
• The findings emphasize the importance of careful protocol design for cell culture studies, ensuring that methodological factors do not inadvertently influence the findings or interpretation of results.