Immunohistochemical study of equine endometrial extracellular matrix during the oestrous cycle.

The research investigates the distribution of key proteins, namely type IV collagen, laminin, and fibronectin, present in the endometrial tissue of horses during various stages of the oestrous cycle.

Objective of the Study

• The primary objective of the research was to understand the distribution of essential proteins – type IV collagen, laminin, and fibronectin in the endometrial samples of horses during their oestrous cycle. These proteins are essential components of the extracellular matrix (ECM), which provides structural and biochemical support to the surrounding cells of a tissue.

Methods Used in the Study

• To achieve the research objectives, uneven samples were prepared for immunohistochemical analysis using the avidin-biotin method. This method involved the use of an antibody against type IV collagen.
• The tissue pieces were fixed in Bouin’s solution and embedded in paraffin wax for preservation before being sectioned for observation under the microscope.
• A total of thirty endometrial biopsies were taken at different stages of the oestrous cycle for a comprehensive view of the protein distribution.

Key Findings of the Study

• The basement membrane of the luminal epithelium, a layer of cells lining the interior surface of the uterus, showed positive reactivity to the antibody against type IV collagen.
• The substances type IV collagen and laminin were located in the basement membranes of endometrial glands, indicating their presence in this part of the ECM structure.
• Fibronectin was found dispersed within the interstitial or connecting tissue, characterizing a particular distribution pattern.
• The researchers also found that all the components of the extracellular matrix studied showed a positive response in blood vessels.
• The study observed no differences in the distribution of these ECM components at different stages of the oestrous cycle. This suggests that the distribution may not be influenced by the hormonal changes occurring during the cycle.