Living fibroblast cells in the oviductal masses of mares.

The study investigated the quantity and kind of living cells in the oviductal masses of mares. The findings indicate that most of the cells found were fibroblasts and the number of recovered oviductal masses was weakly correlated with the mare’s age and the number of unfertilised eggs in the oviduct.

Research Methodology

• The researchers conducted their experiment on mares procured from an abattoir. Their oviducts were dissected and divided into three sections, each flushed separately.
• Oviductal masses were collected from 220 mares (out of 250) and from 389 oviducts (out of 500). Disproportional masses were found in the left oviducts in comparison to the right ones.
• The researchers found more masses were found in the ampullary-isthmic junction than the ampulla or isthmus.
• There was a slight increase in the number of masses with the mares’ age and a weak correlation with the number of unfertilised oocytes recovered per oviduct was observed.
• The study highlighted that prepubescent mares had fewer recovered masses than mares in the early luteal phase, late luteal phase, or pregnant mares.

Cell Identification and Analysis

• The oviductal masses were categorised morphologically into three types – branched, compact, or cumulus. To identify live and dead cells, they used a carboxy fluorescein diacetate and propidium iodide fluorescent stain respectively.
• In branched masses, about 33.7% of the surface area was covered with total cells (both live and dead), while only 6.2% were live cells. The compact masses had 42.4% of their surface area covered with total cells, but only 10.7% were live cells.
• The data was confirmed by extracting and culturing the cells. The cells cultured from cumulus masses remained viable in 57.1% of the wells, but cells from branched and compact masses were viable in only 18.1% and 17.7% of wells respectively.
• The research also showed that cumulus masses had more cells covering the surface area of wells than the branched or compact ones.

Conclusion and Findings

• Post analysis, the researchers concluded that most cells resembled fibroblasts as around 90-95% of cells from branched and compact masses were stained with a fibroblast cell marker.
• This study provides valuable insights into the cellular component of the oviducts in mares, laying the groundwork for future research into equine reproduction biology.