Levels of selected cytokines and acute-phase proteins in the serum of dairy cows with cystic ovarian disease and those in follicular and luteal phases of normal ovarian cycle

The aim of the study was to evaluate the concentration of selected cytokines (tumor necrosis factor [TNF alpha], interleukin [IL]-6, IL-10) and acute-phase proteins (APPs; haptoglobin [Hp] and serum amyloid A [SAA]) in the serum of cows with follicular and luteal ovarian cysts and in those in the follicular and luteal phases of a physiological ovarian cycle. The study was conducted on 24 Holstein-Friesian (HF) cows: eight cows in the follicular phase of the cycle; the same cows after 10 days when they were in the luteal phase; eight cows with follicular cysts; and eight cows with luteal cysts. Levels of progesterone, 17 beta-estradiol, TNF-alpha, IL-6, IL-10, SAA, and Hp were evaluated in the serum of all examined cows. The concentration of the assessed parameters in the serum was determined using commercially available bovine ELISA kits that were specific for each parameter. The results obtained then showed that values of TNF-alpha and IL-6 were highest in cows with luteal cysts (p <. 001), compared to those with other ovarian structures. The highest level of IL-10 was recorded in cows with two types of ovarian cysts. Furthermore, high values of SAA and Hp were found in cows with two types of cysts; however, these values were higher in cows with follicular cysts. The present study shows that an assessment of the levels of cytokines (pro- and anti-inflammatory) and APPs in the serum may be important in the investigation of the processes underlying the formation and differentiation of ovarian cysts in dairy cows.