Hematochemical Patterns in Follicular Fluid and Blood Stream in Cycling Mares: A Comparative Note.

This research study investigates the relationship between the biochemical content of ovarian follicular fluid and systemic concentrations in mares during their reproductive cycle. The study specifically analysed various metabolites, enzymatic activities, electrolytes, proteins and their correlations with follicular size.

Objective of the Research

• Primarily, this study aimed to explore the possibility of a cross-talk between ovarian follicular fluid (FF) and systemic concentrations in relation to the development of follicles in mares during their reproductive cycle. The “cross-talk” here refers to the interaction or communication between these two biological compartments which might influence the metabolites and proteins present in them.

Measurements and Findings

• The study analyzed diverse metabolites (substances formed in or necessary for metabolism), such as glucose, lactate, cholesterol, triglycerides, total bilirubin, blood urea nitrogen, and creatinine.
• Enzymatic activities were also considered, including gamma-glutamyl transferase, lactate dehydrogenase, alkaline phosphatase, and aspartate aminotransferase.
• Various electrolytes were examined, like calcium, phosphorus, sodium, chloride, potassium, magnesium, and iron.
• Additionally, total proteins and their fractions, including albumin and various globulins, were evaluated in both follicular fluid and bloodstream and how they correlated with the size of follicles.
• The researchers discovered varying concentrations when comparing the follicular fluid and systemic measures. For example, systemic concentrations of glucose, total bilirubin, blood urea nitrogen, iron, total proteins, albumin, and specific globulins were found to be higher than in FF. Conversely, lactate, cholesterol, and triglycerides were higher in follicular fluid than in the systemic concentrations.
• Notably, the size of the follicles also influenced these concentrations. Larger follicles had higher levels of glucose, cholesterol, triglycerides, lactate, and total bilirubin. In contrast, the levels of blood urea nitrogen, iron, and some enzyme activities decreased as the follicles grew larger.

Implications of the Results

• The authors propose that these results suggest the metabolic, enzymatic, electrolytic, and protein composition of growing follicles could occur in accordance with the changes in the bloodstream. This suggests a possible interaction or reciprocal influence between the systemic biochemistry and that of the follicular fluid.
• Understanding these dynamics might improve clinical diagnoses of infertility in mares by better understanding the nutritional environment of the oocyte (immature egg cell) and follicular cells.